/* ============================================================
   SIGNAL — AI 新闻信号台
   多主题设计系统（CSS 变量）
   ============================================================ */

:root {
  --font-display: "Space Grotesk", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Code", ui-monospace, "SF Mono", monospace;

  --radius-s: 6px;
  --radius-m: 10px;
  --radius-l: 16px;

  --maxw: 1200px;
  --header-h: 60px;

  --cat-s: 74%;
  --cat-l: 38%;
}

/* ---------------- Theme tokens ---------------- */

html[data-theme="paper"], html[data-theme="auto"] {
  color-scheme: light;
  --bg: #e8edf2;
  --bg-soft: #dde4ec;
  --surface: #f5f7fa;
  --surface-2: #ffffff;
  --line: rgba(16, 35, 59, 0.12);
  --line-strong: rgba(16, 35, 59, 0.24);
  --text: #10233b;
  --text-dim: #4e6278;
  --text-faint: #8394a8;
  --accent: #b06f08;
  --accent-2: #0e7fa8;
  --accent-contrast: #ffffff;
  --live: #d64545;
  --shadow: 0 1px 2px rgba(16, 35, 59, 0.06), 0 8px 24px rgba(16, 35, 59, 0.08);
  --shadow-hover: 0 2px 6px rgba(16, 35, 59, 0.08), 0 18px 44px rgba(16, 35, 59, 0.16);
  --glow: 0 0 0 3px rgba(16, 127, 168, 0.16);
  --cat-l: 40%;
  --tok-key: #6d28d9;
  --tok-str: #15803d;
  --tok-num: #c2410c;
  --tok-builtin: #0369a1;
  --tok-comment: #8394a8;
  --tok-deco: #0e7490;
}

html[data-theme="midnight"] {
  color-scheme: dark;
  --bg: #0b0c0e;
  --bg-soft: #101216;
  --surface: #131518;
  --surface-2: #1a1d22;
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.18);
  --text: #e8eaed;
  --text-dim: #9ba3ad;
  --text-faint: #5d6671;
  --accent: #ffc24b;
  --accent-2: #4fd8ff;
  --accent-contrast: #1a1203;
  --live: #ff6b5e;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 30px rgba(0, 0, 0, 0.45);
  --shadow-hover: 0 2px 6px rgba(0, 0, 0, 0.4), 0 20px 50px rgba(0, 0, 0, 0.6);
  --glow: 0 0 0 3px rgba(79, 216, 255, 0.18);
  --cat-l: 72%;
  --tok-key: #ffc24b;
  --tok-str: #7dd88f;
  --tok-num: #ff9e64;
  --tok-builtin: #4fd8ff;
  --tok-comment: #5d6671;
  --tok-deco: #56d4dd;
}

html[data-theme="aurora"] {
  color-scheme: dark;
  --bg: #0e0d1a;
  --bg-soft: #15142a;
  --surface: #181730;
  --surface-2: #221f42;
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.18);
  --text: #efecfd;
  --text-dim: #aca7cf;
  --text-faint: #6c6791;
  --accent: #c792ea;
  --accent-2: #6fd8ff;
  --accent-contrast: #160f1f;
  --live: #ff8fb2;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 34px rgba(0, 0, 0, 0.5);
  --shadow-hover: 0 2px 6px rgba(0, 0, 0, 0.4), 0 22px 54px rgba(0, 0, 0, 0.65);
  --glow: 0 0 0 3px rgba(199, 146, 234, 0.2);
  --cat-l: 74%;
  --tok-key: #c792ea;
  --tok-str: #7ee787;
  --tok-num: #f78c6c;
  --tok-builtin: #6fd8ff;
  --tok-comment: #6c6791;
  --tok-deco: #56d4dd;
}

html[data-theme="ink"] {
  color-scheme: dark;
  --bg: #0b1411;
  --bg-soft: #0f1b17;
  --surface: #12211b;
  --surface-2: #192c24;
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.18);
  --text: #e4efe9;
  --text-dim: #9ab4a7;
  --text-faint: #5f7a6d;
  --accent: #7fd6a8;
  --accent-2: #e9c46a;
  --accent-contrast: #0d1a13;
  --live: #f2a65a;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 34px rgba(0, 0, 0, 0.5);
  --shadow-hover: 0 2px 6px rgba(0, 0, 0, 0.4), 0 22px 54px rgba(0, 0, 0, 0.65);
  --glow: 0 0 0 3px rgba(127, 214, 168, 0.2);
  --cat-l: 72%;
  --tok-key: #e9c46a;
  --tok-str: #7fd6a8;
  --tok-num: #f2a65a;
  --tok-builtin: #6db1ff;
  --tok-comment: #5f7a6d;
  --tok-deco: #56d4dd;
}

/* ============================================================
   SUCKLESS 极简主题 —— 致敬 suckless.org
   白底黑字 / 纯色方正 / 无圆角 / 无阴影 / 无毛玻璃
   一切从简，软件哲学：做减法
   ============================================================ */

html[data-theme="suckless"],
html[data-theme="suckless-dark"] {
  --font-display: "Verdana", "DejaVu Sans", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-body: "Verdana", "DejaVu Sans", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Arial", sans-serif;
  --font-mono: "Liberation Mono", "DejaVu Sans Mono", ui-monospace, "Cascadia Code", "SF Mono", monospace;

  --radius-s: 0px;
  --radius-m: 0px;
  --radius-l: 0px;

  --shadow: none;
  --shadow-hover: none;
  --glow: none;
  --cat-l: 32%;

  /* 共享的 suckless 组件变量（浅色为默认，暗色在下方覆盖） */
  --sl-bg: #ffffff;
  --sl-bg-soft: #e8e8e8;
  --sl-fg: #000000;
  --sl-dim: #333333;
  --sl-faint: #444444;
  --sl-accent: #000000;
  --sl-live: #cc0000;
  --sl-skel: #d0d0d0;
}

html[data-theme="suckless"] {
  color-scheme: light;

  --bg: #ffffff;
  --bg-soft: #ffffff;
  --surface: #ffffff;
  --surface-2: #ffffff;
  --line: #000000;
  --line-strong: #000000;
  --text: #000000;
  --text-dim: #1a1a1a;
  --text-faint: #444444;
  --accent: #000000;
  --accent-2: #000000;
  --accent-contrast: #ffffff;
  --live: #cc0000;
  --tok-key: #000000;
  --tok-str: #000000;
  --tok-num: #000000;
  --tok-builtin: #000000;
  --tok-comment: #444444;
  --tok-deco: #000000;
}

html[data-theme="suckless-dark"] {
  color-scheme: dark;

  --bg: #0d0d0d;
  --bg-soft: #0d0d0d;
  --surface: #0d0d0d;
  --surface-2: #161616;
  --line: #ffffff;
  --line-strong: #ffffff;
  --text: #e6e6e6;
  --text-dim: #c4c4c4;
  --text-faint: #8a8a8a;
  --accent: #e6e6e6;
  --accent-2: #e6e6e6;
  --accent-contrast: #0d0d0d;
  --live: #ff6b6b;
  --cat-l: 74%;
  --tok-key: #e6e6e6;
  --tok-str: #e6e6e6;
  --tok-num: #e6e6e6;
  --tok-builtin: #e6e6e6;
  --tok-comment: #8a8a8a;
  --tok-deco: #e6e6e6;

  --sl-bg: #0d0d0d;
  --sl-bg-soft: #2a2a2a;
  --sl-fg: #e6e6e6;
  --sl-dim: #c4c4c4;
  --sl-faint: #8a8a8a;
  --sl-accent: #e6e6e6;
  --sl-live: #ff6b6b;
  --sl-skel: #3a3a3a;
}

/* ============================================================
   MAC 风格主题 —— 仿 macOS 外观（毛玻璃 / SF 字体 / 红绿灯）
   亮暗跟随系统：亮色 = macOS 浅色，暗色 = macOS 深色
   ============================================================ */

html[data-theme="mac"] {
  color-scheme: light dark;

  --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, "Cascadia Code", monospace;

  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 20px;

  --bg: #f5f5f7;
  --bg-soft: #e8e8ed;
  --surface: rgba(255, 255, 255, 0.68);
  --surface-2: rgba(255, 255, 255, 0.88);
  --line: rgba(0, 0, 0, 0.08);
  --line-strong: rgba(0, 0, 0, 0.16);
  --text: #1d1d1f;
  --text-dim: #6e6e73;
  --text-faint: #86868b;
  --accent: #0071e3;
  --accent-2: #007aff;
  --accent-contrast: #ffffff;
  --live: #ff3b30;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.05), 0 10px 30px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 2px 4px rgba(0, 0, 0, 0.06), 0 20px 50px rgba(0, 0, 0, 0.16);
  --glow: 0 0 0 3px rgba(0, 122, 255, 0.18);
  --cat-l: 46%;
  --tok-key: #7b1fa2;
  --tok-str: #2e7d32;
  --tok-num: #e65100;
  --tok-builtin: #0070bb;
  --tok-comment: #6e6e73;
  --tok-deco: #00838f;
}

@media (prefers-color-scheme: dark) {
  html[data-theme="mac"] {
    --bg: #1c1c1e;
    --bg-soft: #28282b;
    --surface: rgba(58, 58, 60, 0.72);
    --surface-2: rgba(72, 72, 74, 0.9);
    --line: rgba(255, 255, 255, 0.1);
    --line-strong: rgba(255, 255, 255, 0.2);
    --text: #f5f5f7;
    --text-dim: #aeaeb2;
    --text-faint: #86868b;
    --accent: #0a84ff;
    --accent-2: #64d2ff;
    --accent-contrast: #ffffff;
    --live: #ff453a;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 34px rgba(0, 0, 0, 0.5);
    --shadow-hover: 0 2px 6px rgba(0, 0, 0, 0.4), 0 22px 54px rgba(0, 0, 0, 0.65);
    --glow: 0 0 0 3px rgba(10, 132, 255, 0.24);
    --cat-l: 72%;
    --tok-key: #ff7ab2;
    --tok-str: #7ee787;
    --tok-num: #ff9e64;
    --tok-builtin: #64d2ff;
    --tok-comment: #86868b;
    --tok-deco: #56d4dd;
  }
}

/* Mac 背景氛围：柔和渐变 + 毛玻璃质感 */
html[data-theme="mac"] body {
  background-image:
    radial-gradient(70% 50% at 12% -8%, rgba(0, 113, 227, 0.14), transparent 58%),
    radial-gradient(60% 45% at 92% 4%, rgba(100, 210, 255, 0.12), transparent 55%),
    radial-gradient(55% 55% at 70% 110%, rgba(175, 82, 222, 0.08), transparent 60%);
  background-attachment: fixed;
}

/* Mac 毛玻璃表面 */
html[data-theme="mac"] .site-header,
html[data-theme="mac"] .ticker,
html[data-theme="mac"] .hero,
html[data-theme="mac"] .hot-panel,
html[data-theme="mac"] .card,
html[data-theme="mac"] .links-col,
html[data-theme="mac"] .skeleton,
html[data-theme="mac"] .theme-panel,
html[data-theme="mac"] .reader-panel {
  -webkit-backdrop-filter: blur(18px) saturate(1.7);
  backdrop-filter: blur(18px) saturate(1.7);
}
html[data-theme="mac"] .site-header {
  background: color-mix(in srgb, var(--bg) 55%, transparent);
}
html[data-theme="mac"] .ticker {
  background: color-mix(in srgb, var(--bg-soft) 55%, transparent);
}

/* Mac 顶部红绿灯（菜单栏样式） */
html[data-theme="mac"] .header-inner::before {
  content: "";
  flex-shrink: 0;
  width: 52px;
  height: 12px;
  background:
    radial-gradient(circle 5px at 6px 6px, #ff5f57 98%, transparent 100%),
    radial-gradient(circle 5px at 26px 6px, #febc2e 98%, transparent 100%),
    radial-gradient(circle 5px at 46px 6px, #28c840 98%, transparent 100%);
}

/* Mac 菜单栏文字用系统样式 */
html[data-theme="mac"] .brand-name { font-weight: 600; letter-spacing: -0.01em; }
html[data-theme="mac"] .brand-tag,
html[data-theme="mac"] .filter-label,
html[data-theme="mac"] .live-label,
html[data-theme="mac"] .ticker-label { text-transform: none; letter-spacing: 0.02em; }

@media (prefers-color-scheme: dark) {
  html[data-theme="auto"] {
    color-scheme: dark;
    --bg: #0b0c0e;
    --bg-soft: #101216;
    --surface: #131518;
    --surface-2: #1a1d22;
    --line: rgba(255, 255, 255, 0.09);
    --line-strong: rgba(255, 255, 255, 0.18);
    --text: #e8eaed;
    --text-dim: #9ba3ad;
    --text-faint: #5d6671;
    --accent: #ffc24b;
    --accent-2: #4fd8ff;
    --accent-contrast: #1a1203;
    --live: #ff6b5e;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 30px rgba(0, 0, 0, 0.45);
    --shadow-hover: 0 2px 6px rgba(0, 0, 0, 0.4), 0 20px 50px rgba(0, 0, 0, 0.6);
    --glow: 0 0 0 3px rgba(79, 216, 255, 0.18);
    --cat-l: 72%;
  }
}

/* Aurora ambience */
html[data-theme="aurora"] body {
  background-image:
    radial-gradient(60% 40% at 85% -10%, rgba(120, 90, 220, 0.28), transparent 60%),
    radial-gradient(50% 40% at 0% 20%, rgba(60, 160, 220, 0.16), transparent 60%);
  background-attachment: fixed;
}

/* ---------------- Reset & base ---------------- */

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.2; margin: 0; font-weight: 600; }

a { color: inherit; text-decoration: none; }

button {
  font-family: var(--font-body);
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 2px;
  border-radius: 4px;
}

::selection { background: color-mix(in srgb, var(--accent) 30%, transparent); }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  z-index: 200;
  padding: 8px 14px;
  background: var(--surface-2);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-s);
  font-size: 13px;
}
.skip-link:focus { left: 8px; }

/* ---------------- Header ---------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-mark {
  width: 26px;
  height: 26px;
  display: grid;
  grid-template-columns: repeat(4, 3px);
  grid-template-rows: repeat(4, 3px);
  gap: 2px;
  transform: rotate(0deg);
}
.brand-mark i {
  display: block;
  background: var(--accent);
  opacity: 0.25;
  border-radius: 1px;
}
.brand-mark i:nth-child(1) { opacity: 1; }
.brand-mark i:nth-child(2) { opacity: 0.75; }
.brand-mark i:nth-child(3) { opacity: 0.5; }
.brand-mark i:nth-child(4) { opacity: 0.9; }

.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.04em;
}
.brand-name .accent { color: var(--accent); }

.brand-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

.main-nav {
  display: flex;
  gap: 4px;
  margin-left: 8px;
}
.main-nav a {
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13.5px;
  color: var(--text-dim);
  transition: color 0.15s, background 0.15s;
}
.main-nav a:hover { color: var(--text); }
.main-nav a.active {
  color: var(--text);
  background: var(--surface-2);
  box-shadow: inset 0 0 0 1px var(--line);
}

.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 12.5px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text-dim);
  transition: border-color 0.15s, color 0.15s, background 0.15s;
  white-space: nowrap;
}
.header-btn:hover { color: var(--text); border-color: var(--line-strong); }
.header-btn svg { width: 14px; height: 14px; flex-shrink: 0; }

/* Live indicator */
.live-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 4px;
}
.live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--live);
  box-shadow: 0 0 0 0 var(--live);
  animation: live-pulse 1.8s infinite;
}
@keyframes live-pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--live) 55%, transparent); }
  70% { box-shadow: 0 0 0 7px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}
.live-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  text-transform: uppercase;
}

/* Signal bars (header) */
.signal {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 16px;
  width: 22px;
}
.signal span {
  flex: 1;
  background: var(--accent);
  border-radius: 1px;
  animation: signal-bounce 1.1s ease-in-out infinite;
}
.signal span:nth-child(1) { height: 40%; animation-delay: 0s; }
.signal span:nth-child(2) { height: 90%; animation-delay: 0.15s; }
.signal span:nth-child(3) { height: 60%; animation-delay: 0.3s; }
.signal span:nth-child(4) { height: 100%; animation-delay: 0.45s; }
@keyframes signal-bounce {
  0%, 100% { transform: scaleY(0.55); }
  50% { transform: scaleY(1); }
}
.signal.off span { animation-play-state: paused; opacity: 0.35; }

/* ---------------- Ticker ---------------- */

.ticker {
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
}
.ticker-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 7px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.ticker-label {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  padding: 2px 7px;
  border-radius: 999px;
}
.ticker-viewport { overflow: hidden; flex: 1; }
.ticker-track {
  display: flex;
  gap: 40px;
  width: max-content;
  animation: ticker-scroll 55s linear infinite;
}
.ticker:hover .ticker-track { animation-play-state: paused; }
.ticker-track a {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-dim);
  white-space: nowrap;
  display: flex;
  gap: 8px;
  align-items: center;
}
.ticker-track a:hover { color: var(--text); }
.ticker-track .t-src { color: var(--text-faint); }
.ticker-track .t-time { color: var(--text-faint); font-size: 10.5px; }
@keyframes ticker-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ---------------- Filter bar ---------------- */

.filterbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-start;
  padding: 16px 0 4px;
}
.filter-group { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.filter-group + .filter-group { padding-left: 12px; border-left: 1px solid var(--line); }

.filter-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-right: 2px;
}

.chip {
  padding: 5px 11px;
  border-radius: 999px;
  font-size: 12.5px;
  border: 1px solid var(--line);
  color: var(--text-dim);
  background: transparent;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.chip:hover { color: var(--text); border-color: var(--line-strong); }
.chip.active {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-color: color-mix(in srgb, var(--accent) 60%, transparent);
  font-weight: 600;
}
.chip .cdot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: hsl(var(--cat-h, 0) var(--cat-s) var(--cat-l));
  flex-shrink: 0;
}

.search-wrap {
  margin-left: auto;
  position: relative;
  display: flex;
  align-items: center;
}
.search-wrap input {
  padding: 7px 12px 7px 32px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 12.5px;
  width: 190px;
  transition: width 0.25s, border-color 0.15s;
}
.search-wrap input:focus {
  outline: none;
  border-color: var(--accent-2);
  width: 230px;
}
.search-wrap svg {
  position: absolute;
  left: 11px;
  width: 14px;
  height: 14px;
  color: var(--text-faint);
  pointer-events: none;
}

/* ---------------- Featured / headline area ---------------- */

.featured {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  gap: 18px;
  padding: 20px 0 8px;
}

.hero {
  position: relative;
  display: block;
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
  background:
    linear-gradient(160deg, color-mix(in srgb, hsl(var(--cat-h, 45) var(--cat-s) var(--cat-l)) 16%, transparent), transparent 46%),
    var(--surface);
  padding: 26px 28px;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s, transform 0.2s;
  overflow: hidden;
}
.hero:hover { box-shadow: var(--shadow-hover); transform: translateY(-1px); }
.hero::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: hsl(var(--cat-h, 45) var(--cat-s) var(--cat-l));
}
.hero .hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.hero .hero-title {
  font-size: clamp(1.5rem, 3vw, 2.3rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}
.hero .hero-desc {
  color: var(--text-dim);
  margin: 12px 0 20px;
  font-size: 14.5px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.hero-cover {
  margin: 0 0 16px;
  border-radius: var(--radius-m);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--bg-soft);
}
.hero-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

/* Hot rail */
.hot-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: var(--surface);
  padding: 18px 18px 8px;
  box-shadow: var(--shadow);
}
.hot-panel .panel-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}
.hot-panel .panel-head h2 {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.hot-panel .panel-sub {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.hot-list { list-style: none; margin: 0; padding: 0; }
.hot-list li { border-top: 1px solid var(--line); }
.hot-list a {
  display: flex;
  gap: 12px;
  padding: 12px 2px;
  align-items: flex-start;
}
.hot-list a:hover .hot-title { color: var(--accent); }
.hot-rank {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-faint);
  width: 18px;
  flex-shrink: 0;
  padding-top: 1px;
}
.hot-list li:nth-child(1) .hot-rank { color: var(--accent); }
.hot-list li:nth-child(2) .hot-rank { color: var(--accent); }
.hot-list li:nth-child(3) .hot-rank { color: var(--accent); }
.hot-title {
  font-size: 13.5px;
  font-weight: 500;
  line-height: 1.4;
  transition: color 0.15s;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.hot-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-faint);
  margin-top: 3px;
}

/* ---------------- Grid & cards ---------------- */

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 26px 0 12px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 10px;
}
.section-head h2 {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.section-head .count {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-faint);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--surface);
  overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s, border-color 0.2s;
}
.card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); border-color: var(--line-strong); }
.card .card-top {
  border-top: 3px solid hsl(var(--cat-h, 0) var(--cat-s) var(--cat-l));
  padding: 15px 16px 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-cover {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
}
.card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.card-link { display: block; padding: 0 16px; flex: 1; }
.card-title {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.42;
  letter-spacing: -0.005em;
  transition: color 0.15s;
}
.card:hover .card-title { color: var(--accent); }
.card-desc {
  color: var(--text-dim);
  font-size: 12.5px;
  margin-top: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-foot {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  border-top: 1px solid var(--line);
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-faint);
}
.card-open {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--accent-2);
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--accent-2) 40%, transparent);
  transition: color 0.15s, border-color 0.15s, background 0.15s;
  white-space: nowrap;
}
.card-open:hover {
  color: var(--text);
  background: color-mix(in srgb, var(--accent-2) 12%, transparent);
  border-color: color-mix(in srgb, var(--accent-2) 60%, transparent);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 2.5px 7px;
  border-radius: 999px;
  white-space: nowrap;
  line-height: 1.3;
}
.badge-src {
  color: var(--text-dim);
  border: 1px solid var(--line);
}
.badge-cat {
  color: hsl(var(--cat-h, 0) var(--cat-s) var(--cat-l));
  border: 1px solid color-mix(in srgb, hsl(var(--cat-h, 0) var(--cat-s) var(--cat-l)) 45%, transparent);
  background: color-mix(in srgb, hsl(var(--cat-h, 0) var(--cat-s) var(--cat-l)) 10%, transparent);
}
.badge-new {
  color: var(--text);
  background: color-mix(in srgb, var(--live) 18%, transparent);
  border: 1px solid color-mix(in srgb, var(--live) 50%, transparent);
  animation: new-blink 2.4s ease-in-out infinite;
}
@keyframes new-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}
.badge-live {
  color: var(--accent-contrast);
  background: var(--live);
  border: none;
}
.badge-heat {
  color: var(--accent-2);
  border: 1px solid color-mix(in srgb, var(--accent-2) 45%, transparent);
}

.meta-item { display: inline-flex; align-items: center; gap: 4px; }
.meta-sep { opacity: 0.4; }

/* Comments */
.read-toggle,
.comment-toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-faint);
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  transition: color 0.15s, border-color 0.15s;
  background: transparent;
}
.read-toggle:hover { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 50%, transparent); }
.read-toggle svg { width: 12px; height: 12px; }
.comment-toggle { margin-left: auto; }
.comment-toggle:hover { color: var(--accent-2); border-color: color-mix(in srgb, var(--accent-2) 50%, transparent); }
.comment-toggle svg { width: 12px; height: 12px; }

.comment-box {
  display: none;
  border-top: 1px dashed var(--line);
  padding: 14px 16px;
}
.comment-box.open { display: block; }
.comment-note {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-faint);
  padding: 12px 0;
}

/* Category color spectrum (hue per category) */
.cat-models  { --cat-h: 45; }
.cat-business{ --cat-h: 160; }
.cat-policy  { --cat-h: 214; }
.cat-safety  { --cat-h: 6; }
.cat-research{ --cat-h: 268; }
.cat-compute { --cat-h: 195; }
.cat-robotics{ --cat-h: 330; }
.cat-apps    { --cat-h: 96; }
.cat-other   { --cat-h: 222; }

/* ---------------- Back to top ---------------- */

.back-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  z-index: 150;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--surface-2);
  color: var(--text-dim);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease, color 0.15s, border-color 0.15s;
}
.back-top.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.back-top:hover {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 55%, transparent);
}
.back-top svg { width: 20px; height: 20px; }

@media (max-width: 700px) {
  .back-top { right: 14px; bottom: 18px; width: 40px; height: 40px; }
}

/* ---------------- Skeleton & states ---------------- */

.skeleton {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--surface);
  padding: 16px;
}
.sk-line {
  height: 12px;
  border-radius: 6px;
  background: var(--line);
  margin-bottom: 10px;
  animation: sk-shimmer 1.4s ease-in-out infinite;
}
.sk-line.short { width: 40%; }
.sk-line.tall { height: 34px; }
@keyframes sk-shimmer {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

.empty-state, .error-state {
  grid-column: 1 / -1;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-m);
  padding: 42px 20px;
  text-align: center;
  color: var(--text-dim);
  font-size: 13.5px;
}
.empty-state .hint, .error-state .hint {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-faint);
  margin-top: 8px;
  letter-spacing: 0.04em;
}

.load-more {
  display: block;
  margin: 26px auto 0;
  padding: 10px 26px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--text-dim);
  font-size: 13px;
  transition: all 0.15s;
}
.load-more:hover { color: var(--text); border-color: var(--accent); }

/* ---------------- Source status (footer) ---------------- */

.source-status {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.src-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-faint);
  border: 1px solid var(--line);
  padding: 4px 9px;
  border-radius: 999px;
}
.src-chip.ok { color: var(--accent-2); border-color: color-mix(in srgb, var(--accent-2) 40%, transparent); }
.src-chip.bad { color: var(--live); border-color: color-mix(in srgb, var(--live) 40%, transparent); }
.src-chip .s-count { opacity: 0.7; }

/* ---------------- Footer ---------------- */

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 48px;
  padding: 30px 0 40px;
  color: var(--text-dim);
  font-size: 12.5px;
}
.site-footer .foot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}
.site-footer h3 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-faint);
  font-family: var(--font-mono);
  margin-bottom: 10px;
  font-weight: 500;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 6px; }
.site-footer a:hover { color: var(--accent); }

/* ---------------- Theme dropdown ---------------- */

.theme-menu {
  position: relative;
}
.theme-panel {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  min-width: 168px;
  background: var(--surface-2);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-hover);
  padding: 6px;
  z-index: 120;
  display: none;
}
.theme-panel.open { display: block; animation: pop 0.14s ease-out; }
@keyframes pop {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}
.theme-opt {
  display: flex;
  align-items: center;
  gap: 9px;
  width: 100%;
  padding: 7px 10px;
  border-radius: 7px;
  font-size: 13px;
  color: var(--text-dim);
  transition: background 0.12s, color 0.12s;
}
.theme-opt:hover { background: var(--line); color: var(--text); }
.theme-opt.active { color: var(--text); font-weight: 600; }
.theme-swatch {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  flex-shrink: 0;
}
.theme-opt .check { margin-left: auto; color: var(--accent); font-family: var(--font-mono); font-size: 12px; }

/* ============================================================
   LINKS PAGE
   ============================================================ */

.page-hero {
  padding: 44px 0 8px;
}
.page-hero h1 {
  font-size: clamp(1.9rem, 4vw, 3rem);
  letter-spacing: -0.015em;
}
.page-hero .lead {
  color: var(--text-dim);
  font-size: 14.5px;
  max-width: 620px;
  margin-top: 10px;
}
.page-hero .mono-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding: 22px 0 8px;
}
.links-col { border: 1px solid var(--line); border-radius: var(--radius-m); background: var(--surface); padding: 18px; }
.links-col h2 {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.links-col h2::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: hsl(var(--col-h, 45) var(--cat-s) var(--cat-l));
}
.link-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-top: 1px solid var(--line);
}
.link-item:first-of-type { border-top: none; }
.link-item .li-icon {
  width: 20px;
  height: 20px;
  border-radius: 5px;
  flex-shrink: 0;
  object-fit: contain;
  background: var(--surface-2);
  border: 1px solid var(--line);
  padding: 1px;
}
.link-item .li-name { font-weight: 600; font-size: 13.5px; }
.link-item:hover .li-name { color: var(--accent); }
.link-item .li-desc { color: var(--text-faint); font-size: 11.5px; flex: 1; }
.link-item .li-arrow { color: var(--text-faint); font-family: var(--font-mono); font-size: 11px; transition: color 0.15s, transform 0.15s; }
.link-item:hover .li-arrow { color: var(--accent); transform: translate(2px, -2px); }

/* ============================================================
   HISTORY PAGE
   ============================================================ */

.era-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 22px 0 6px;
}

.timeline { position: relative; padding: 18px 0 10px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(var(--line-strong), var(--line));
}
.tl-item { position: relative; padding: 0 0 26px 40px; }
.tl-dot {
  position: absolute;
  left: 2px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--surface);
  background: hsl(var(--tl-h, 45) var(--cat-s) var(--cat-l));
  box-shadow: 0 0 0 1px var(--line-strong);
}
.tl-year {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: hsl(var(--tl-h, 45) var(--cat-s) var(--cat-l));
}
.tl-item.hot .tl-year { font-size: 19px; }
.tl-title { font-size: 16.5px; font-weight: 600; margin-top: 3px; }
.tl-desc { color: var(--text-dim); font-size: 13.5px; margin-top: 5px; max-width: 700px; }
.tl-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  border: 1px solid var(--line);
  padding: 2px 7px;
  border-radius: 999px;
  margin-top: 8px;
}
.tl-item.hot .tl-desc { color: var(--text-dim); }
.tl-item.hot { border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); border-radius: var(--radius-m); padding: 16px 18px 16px 46px; margin-left: -6px; }

/* ---------------- Era detail (阶段详解) ---------------- */

.era-detail {
  padding: 22px 0 4px;
  scroll-margin-top: calc(var(--header-h) + 14px);
}
.ed-card {
  display: grid;
  grid-template-columns: minmax(0, 11fr) minmax(0, 14fr);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: var(--surface);
  overflow: hidden;
  box-shadow: var(--shadow);
  border-top: 3px solid hsl(var(--ed-h, 45) var(--cat-s) var(--cat-l));
}
.ed-media { position: relative; min-height: 240px; }
.ed-media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.ed-period {
  position: absolute;
  left: 14px;
  bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: #ffffff;
  background: rgba(10, 10, 14, 0.6);
  padding: 5px 12px;
  border-radius: 999px;
  letter-spacing: 0.04em;
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}
.ed-body {
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.ed-kicker {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: hsl(var(--ed-h, 45) var(--cat-s) var(--cat-l));
}
.ed-title { font-size: 26px; font-weight: 700; margin-top: 2px; }
.ed-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-top: 4px;
}
.ed-overview {
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1.75;
  margin: 0;
}
.ed-points {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.ed-points li {
  position: relative;
  padding-left: 22px;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--text);
}
.ed-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: hsl(var(--ed-h, 45) var(--cat-s) var(--cat-l));
}
.ed-back {
  align-self: flex-start;
  margin-top: 6px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--text-dim);
  font-size: 12.5px;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.ed-back:hover { color: var(--text); border-color: var(--line-strong); }

@media (max-width: 820px) {
  .ed-card { grid-template-columns: 1fr; }
  .ed-media { aspect-ratio: 16 / 9; min-height: 0; }
  .ed-body { padding: 20px; }
}

/* ============================================================
   TUTORIAL LAYOUT（菜鸟教程风格）
   三栏：左侧章节导航 / 中间正文 / 右侧相关教程
   ============================================================ */

.tutorial-wrap {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr) 210px;
  gap: 24px;
  align-items: start;
  padding: 8px 0 40px;
}
.tut-container { max-width: 1500px; }

/* --- 左侧章节导航 --- */
.tut-nav {
  position: sticky;
  top: calc(var(--header-h) + 14px);
  max-height: calc(100vh - var(--header-h) - 28px);
  overflow-y: auto;
  overscroll-behavior: contain;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 14px 12px 16px;
}
.tut-nav-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 2px 8px 10px;
}
.tut-nav-group + .tut-nav-group {
  border-top: 1px dashed var(--line);
  margin-top: 10px;
  padding-top: 10px;
}
.tut-nav-group h4 {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 8px 6px;
}
.tut-nav-group a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 8px;
  border-radius: var(--radius-s);
  color: var(--text-dim);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.45;
  transition: color 0.15s, background 0.15s;
}
.tut-nav-group a:hover { color: var(--text); background: var(--bg-soft); }
.tut-nav-group a.active {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  font-weight: 600;
}
.tut-no {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-faint);
  flex-shrink: 0;
}
.tut-nav-group a.active .tut-no { color: var(--accent); }

/* --- 中间正文 --- */
.tut-main { min-width: 0; }

.tut-crumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px;
  font-size: 12.5px;
  color: var(--text-faint);
  padding: 18px 0 10px;
}
.tut-crumb a { color: var(--text-dim); text-decoration: none; transition: color 0.15s; }
.tut-crumb a:hover { color: var(--accent); }
.tut-crumb .sep { color: var(--text-faint); }
.tut-crumb .cur { color: var(--text); }

.tut-head {
  border: 1px solid var(--line);
  border-top: 3px solid var(--text);
  border-radius: var(--radius-l);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 24px 28px 22px;
  margin: 10px 0 4px;
}
.tut-head .mono-eyebrow {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
.tut-head h1 {
  font-size: 26px;
  letter-spacing: -0.01em;
  margin-top: 6px;
}
.tut-head .lead {
  color: var(--text-dim);
  font-size: 14px;
  margin-top: 9px;
  max-width: 680px;
  line-height: 1.7;
}

/* --- 每课上下章 --- */
.lesson-pager {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}
.lp-btn {
  flex: 1 1 0;
  max-width: 48%;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--bg-soft);
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
}
.lp-btn.right { margin-left: auto; align-items: flex-end; text-align: right; }
.lp-btn:hover { border-color: var(--line-strong); background: var(--surface-2); }
.lp-btn.off { visibility: hidden; }
.lp-dir {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.lp-name { font-size: 13.5px; font-weight: 600; line-height: 1.4; }

/* --- 右侧相关教程 --- */
.tut-aside {
  position: sticky;
  top: calc(var(--header-h) + 14px);
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.tut-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 16px 16px 14px;
}
.tut-panel-title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  margin: 0 0 10px;
}
.tut-panel-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}
.tut-panel-links a {
  display: block;
  padding: 6px 8px;
  border-radius: var(--radius-s);
  color: var(--text-dim);
  text-decoration: none;
  font-size: 13px;
  transition: color 0.15s, background 0.15s;
}
.tut-panel-links a:hover { color: var(--text); background: var(--bg-soft); }

/* 桌面端隐藏顶部 chips（由左侧导航替代）；移动端隐藏左栏、露出 chips */
.tut-main .lesson-toc { display: none; }
#lessons .lesson,
#lessons .lesson-part {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

@media (max-width: 1180px) {
  .tutorial-wrap { grid-template-columns: 230px minmax(0, 1fr); }
  .tut-aside { display: none; }
}

@media (max-width: 900px) {
  .tutorial-wrap { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .tut-nav { display: none; }
  .tut-aside { display: none; }
  .tut-main .lesson-toc { display: flex; }
  .tut-head { padding: 20px 20px 18px; }
}

/* ============================================================
   LEARN PAGE
   ============================================================ */

.lesson-toc {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 26px 0 4px;
}
.lesson-toc-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-right: 6px;
}
.lesson-toc-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.lesson-toc-chips a {
  padding: 5px 11px;
  border-radius: 999px;
  font-size: 12.5px;
  border: 1px solid var(--line);
  color: var(--text-dim);
  text-decoration: none;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  transition: color 0.15s, border-color 0.15s;
}
.lesson-toc-chips a:hover { color: var(--text); border-color: var(--line-strong); }
.lesson-toc-chips .toc-no {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-faint);
}

.lessons { padding: 6px 0 10px; }

.lesson {
  border: 1px solid var(--line);
  border-top: 3px solid hsl(var(--lh, 45) var(--cat-s) var(--cat-l));
  border-radius: var(--radius-l);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 26px 30px 22px;
  margin: 18px 0;
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.lesson-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}
.lesson-no {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  color: hsl(var(--lh, 45) var(--cat-s) var(--cat-l));
  padding-top: 3px;
}
.lesson-title { font-size: 22px; font-weight: 700; letter-spacing: -0.01em; }
.lesson-lead {
  color: var(--text-dim);
  font-size: 14px;
  margin-top: 7px;
  max-width: 840px;
  line-height: 1.6;
}
.lesson-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 11px; }
.lesson-tags span {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  border: 1px solid var(--line);
  padding: 2px 7px;
  border-radius: 999px;
}

.lesson-body {
  margin-top: 16px;
  border-top: 1px dashed var(--line);
  padding-top: 16px;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text);
}
.l-p { margin: 0 0 15px; max-width: 920px; }
.l-sub {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  margin: 20px 0 4px;
  color: var(--text);
}
.l-sub:first-child { margin-top: 4px; }

.l-block { margin: 0 0 16px; }
.l-block-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: hsl(var(--lh, 45) var(--cat-s) var(--cat-l));
  margin-bottom: 7px;
}
.l-list { margin: 0; padding-left: 1.3em; }
.l-list li { margin: 5px 0; }
.l-list li::marker { color: hsl(var(--lh, 45) var(--cat-s) var(--cat-l)); }

.lg-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--surface-2);
}
.lg-table { width: 100%; border-collapse: collapse; font-size: 13px; min-width: 520px; }
.lg-table th, .lg-table td { border-bottom: 1px solid var(--line); padding: 9px 12px; text-align: left; vertical-align: top; }
.lg-table th {
  background: var(--bg-soft);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dim);
  white-space: nowrap;
}
.lg-table tr:last-child td { border-bottom: none; }
.lg-table td { color: var(--text); }
.lg-table td:first-child { white-space: nowrap; font-weight: 600; }

.l-callout {
  border: 1px solid color-mix(in srgb, hsl(var(--lh, 45) var(--cat-s) var(--cat-l)) 55%, transparent);
  border-radius: var(--radius-m);
  background: color-mix(in srgb, hsl(var(--lh, 45) var(--cat-s) var(--cat-l)) 8%, transparent);
  padding: 12px 16px;
  margin: 0 0 16px;
}
.l-callout-head {
  display: flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: hsl(var(--lh, 45) var(--cat-s) var(--cat-l));
  margin-bottom: 6px;
}
.l-callout-head svg { width: 13px; height: 13px; flex-shrink: 0; }
.l-callout-body p { margin: 0; color: var(--text-dim); font-size: 13.5px; }

.l-code {
  margin: 0 0 16px;
  max-width: 920px;
  position: relative;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-left: 3px solid hsl(var(--lh, 45) var(--cat-s) var(--cat-l));
  border-radius: var(--radius-m);
  background: var(--bg-soft);
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--text);
  tab-size: 4;
  -webkit-overflow-scrolling: touch;
}
.l-code code { font-family: inherit; }
.l-code-copy {
  position: absolute;
  top: 7px;
  right: 7px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  padding: 3px 9px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-s);
  background: var(--surface-2);
  color: var(--text-dim);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s, color 0.15s, border-color 0.15s;
}
.l-code:hover .l-code-copy,
.l-code-copy:focus-visible { opacity: 1; }
.l-code-copy:hover { color: var(--text); border-color: var(--text); }
.l-code-copy.done { color: var(--accent-2); border-color: var(--accent-2); }
@media (hover: none) {
  .l-code { padding-top: 42px; }
  .l-code-copy { opacity: 1; }
}
.l-code .tok-c { color: var(--tok-comment); font-style: italic; }
.l-code .tok-s { color: var(--tok-str); }
.l-code .tok-k { color: var(--tok-key); font-weight: 600; }
.l-code .tok-b { color: var(--tok-builtin); }
.l-code .tok-n { color: var(--tok-num); }
.l-code .tok-d { color: var(--tok-deco); }

.l-terms { margin: 0; display: grid; gap: 8px; }
.l-term {
  display: grid;
  grid-template-columns: minmax(150px, 0.8fr) 2.2fr;
  gap: 14px;
  align-items: baseline;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--bg-soft);
}
.l-term dt { font-weight: 600; font-size: 13.5px; }
.l-term dd { margin: 0; color: var(--text-dim); font-size: 13.5px; }

.l-fig {
  margin: 6px 0 20px;
  max-width: 920px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
  background: var(--bg-soft);
}
.l-fig img {
  display: block;
  width: 100%;
  height: auto;
  border-bottom: 1px solid var(--line);
}
.l-fig figcaption {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 12px;
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--text-dim);
}
.l-fig-credit {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  white-space: nowrap;
}

.lesson-part {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 34px 0 8px;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--text);
  border-radius: var(--radius-l);
  background: var(--surface);
  box-shadow: var(--shadow);
  scroll-margin-top: calc(var(--header-h) + 16px);
}
.lesson-part-no {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 28px;
  line-height: 1;
  color: var(--text-faint);
}
.lesson-part h2 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.lesson-toc-part {
  flex-basis: 100%;
  width: 100%;
  padding: 9px 2px 2px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.lesson-toc-part:first-child { padding-top: 0; }

@media (max-width: 820px) {
  .lesson { padding: 20px 18px 18px; margin: 14px 0; }
  .lesson-head { grid-template-columns: 1fr; gap: 8px; }
  .lesson-no { font-size: 26px; }
  .l-term { grid-template-columns: 1fr; gap: 4px; }
  .lesson-toc { padding-top: 18px; }
  .lesson-part { flex-direction: column; align-items: flex-start; gap: 6px; padding: 16px 18px; }
  .l-fig { max-width: 100%; }
  .l-fig figcaption { flex-direction: column; gap: 2px; }
  .l-code { max-width: 100%; font-size: 11.5px; padding: 12px 14px; }
}

/* ---------------- Reader mode ---------------- */

.reader-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.reader-overlay[hidden] { display: none; }

.reader-panel {
  width: min(780px, 100%);
  max-height: 92vh;
  display: flex;
  flex-direction: column;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow-hover);
  overflow: hidden;
  animation: reader-in 0.22s ease;
}
@keyframes reader-in {
  from { opacity: 0; transform: translateY(14px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.reader-head {
  padding: 18px 22px 14px;
  border-bottom: 1px solid var(--line);
  flex-shrink: 0;
}
.reader-head-top {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.reader-hint {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-left: auto;
}
.reader-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.35;
  margin: 10px 0 6px;
}
.reader-meta {
  font-size: 12px;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.reader-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
}

.reader-body {
  overflow-y: auto;
  padding: 26px 30px 34px;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text);
}
.reader-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-m);
  margin: 12px 0;
  display: block;
}
.reader-body h1, .reader-body h2, .reader-body h3, .reader-body h4,
.reader-body h5, .reader-body h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.4;
  margin: 1.4em 0 0.5em;
}
.reader-body h1 { font-size: 22px; }
.reader-body h2 { font-size: 19px; }
.reader-body h3 { font-size: 16.5px; }
.reader-body h4, .reader-body h5, .reader-body h6 { font-size: 15px; }
.reader-body p { margin: 0 0 1em; }
.reader-body a { color: var(--accent-2); text-decoration: underline; text-underline-offset: 3px; }
.reader-body blockquote {
  margin: 1.2em 0;
  padding: 10px 16px;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  color: var(--text-dim);
}
.reader-body ul, .reader-body ol { margin: 0 0 1em; padding-left: 1.4em; }
.reader-body li { margin: 0.3em 0; }
.reader-body pre {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  padding: 14px 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  margin: 0 0 1em;
}
.reader-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-soft);
  padding: 2px 5px;
  border-radius: 4px;
}
.reader-body pre code { background: none; padding: 0; }
.reader-body hr { border: none; border-top: 1px solid var(--line); margin: 1.6em 0; }
.reader-body figure { margin: 1.2em 0; }
.reader-body figcaption {
  font-size: 12.5px;
  color: var(--text-faint);
  text-align: center;
  margin-top: 6px;
}
.reader-body table { width: 100%; border-collapse: collapse; margin: 1em 0; font-size: 14px; }
.reader-body th, .reader-body td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
.reader-body th { background: var(--bg-soft); }

.reader-foot {
  flex-shrink: 0;
  padding: 12px 22px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 11.5px;
  color: var(--text-faint);
}
.reader-foot a { color: var(--accent-2); text-decoration: underline; text-underline-offset: 2px; }

.reader-empty {
  padding: 60px 20px;
  text-align: center;
  color: var(--text-dim);
}
.reader-loading {
  padding: 50px 20px;
  text-align: center;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

body.reader-open { overflow: hidden; }

@media (max-width: 700px) {
  .reader-overlay { padding: 0; align-items: stretch; }
  .reader-panel { max-height: 100vh; width: 100%; border: none; border-radius: 0; }
  .reader-body { padding: 18px 18px 26px; }
  html[data-theme="mac"] .header-inner::before { display: none; }
}

/* ---------------- Card inline full-text ---------------- */

.card-full {
  border-top: 1px dashed var(--line);
  padding: 16px 18px 8px;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text);
}
.card-full p { margin: 0 0 0.9em; }
.card-full img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-m);
  margin: 10px 0;
  display: block;
}
.card-full a { color: var(--accent-2); text-decoration: underline; text-underline-offset: 3px; }
.card-full h1, .card-full h2, .card-full h3, .card-full h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.4;
  margin: 1.2em 0 0.5em;
  font-size: 16px;
}
.card-full blockquote {
  margin: 1em 0;
  padding: 8px 14px;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  color: var(--text-dim);
}
.card-full ul, .card-full ol { margin: 0 0 0.9em; padding-left: 1.4em; }
.card-full li { margin: 0.3em 0; }
.card-full pre {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  padding: 12px 14px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  margin: 0 0 0.9em;
}
.card-full code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-soft);
  padding: 2px 5px;
  border-radius: 4px;
}
.card-full pre code { background: none; padding: 0; }
.card-full hr { border: none; border-top: 1px solid var(--line); margin: 1.4em 0; }
.card-full figure { margin: 1em 0; }
.card-full figcaption { font-size: 12px; color: var(--text-faint); text-align: center; margin-top: 4px; }
.card-full table { width: 100%; border-collapse: collapse; margin: 1em 0; font-size: 13.5px; }
.card-full th, .card-full td { border: 1px solid var(--line); padding: 7px 9px; text-align: left; }
.card-full th { background: var(--bg-soft); }

.card-full-note {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-dim);
  font-size: 13px;
  padding: 4px 0 8px;
}
.card-full-note a { color: var(--accent-2); }

.read-toggle svg { transition: transform 0.18s ease; }
.card.expanded .read-toggle {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 50%, transparent);
}
.card.expanded .read-toggle svg { transform: rotate(180deg); }

/* ============================================================
   SUCKLESS 极简主题 / SUCKLESS 极简暗色 —— 组件覆盖
   纯色方正 / 无圆角 / 无阴影 / 无毛玻璃 / 黑色分隔线（深浅互反）
   ============================================================ */

html[data-theme="suckless"] body, html[data-theme="suckless-dark"] body {
  background: var(--sl-bg);
  transition: none;
  -webkit-font-smoothing: auto;
  text-rendering: optimizeSpeed;
}
html[data-theme="suckless"] ::selection, html[data-theme="suckless-dark"] ::selection { background: var(--sl-fg); color: var(--sl-bg); }
html[data-theme="suckless"] :focus-visible, html[data-theme="suckless-dark"] :focus-visible { outline: 2px solid var(--sl-fg); outline-offset: 1px; border-radius: 0; }

/* 去掉毛玻璃 */
html[data-theme="suckless"] .site-header, html[data-theme="suckless-dark"] .site-header,
html[data-theme="suckless"] .theme-panel, html[data-theme="suckless-dark"] .theme-panel,
html[data-theme="suckless"] .reader-panel, html[data-theme="suckless-dark"] .reader-panel,
html[data-theme="suckless"] .card, html[data-theme="suckless-dark"] .card,
html[data-theme="suckless"] .hero, html[data-theme="suckless-dark"] .hero,
html[data-theme="suckless"] .hot-panel, html[data-theme="suckless-dark"] .hot-panel,
html[data-theme="suckless"] .links-col, html[data-theme="suckless-dark"] .links-col,
html[data-theme="suckless"] .skeleton, html[data-theme="suckless-dark"] .skeleton {
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

/* 头部 */
html[data-theme="suckless"] .site-header, html[data-theme="suckless-dark"] .site-header {
  background: var(--sl-bg);
  border-bottom: 2px solid var(--sl-fg);
}
html[data-theme="suckless"] .brand-mark i, html[data-theme="suckless-dark"] .brand-mark i { background: var(--sl-fg); border-radius: 0; }
html[data-theme="suckless"] .brand-name, html[data-theme="suckless-dark"] .brand-name { font-family: var(--font-body); letter-spacing: 0; }
html[data-theme="suckless"] .brand-tag, html[data-theme="suckless-dark"] .brand-tag { color: var(--sl-faint); }
html[data-theme="suckless"] .main-nav a, html[data-theme="suckless-dark"] .main-nav a { border-radius: 0; color: var(--sl-fg); }
html[data-theme="suckless"] .main-nav a:hover, html[data-theme="suckless-dark"] .main-nav a:hover { text-decoration: underline; text-underline-offset: 3px; }
html[data-theme="suckless"] .main-nav a.active, html[data-theme="suckless-dark"] .main-nav a.active {
  color: var(--sl-bg);
  background: var(--sl-fg);
  box-shadow: none;
}
html[data-theme="suckless"] .header-btn, html[data-theme="suckless-dark"] .header-btn {
  border-radius: 0;
  border-color: var(--sl-fg);
  background: var(--sl-bg);
  color: var(--sl-fg);
}
html[data-theme="suckless"] .header-btn:hover, html[data-theme="suckless-dark"] .header-btn:hover { border-color: var(--sl-fg); background: var(--sl-fg); color: var(--sl-bg); }
html[data-theme="suckless"] .live-label, html[data-theme="suckless-dark"] .live-label { color: var(--sl-live); }

/* 信号流 ticker */
html[data-theme="suckless"] .ticker, html[data-theme="suckless-dark"] .ticker { background: var(--sl-bg); border-bottom: 1px solid var(--sl-fg); }
html[data-theme="suckless"] .ticker-label, html[data-theme="suckless-dark"] .ticker-label {
  border-radius: 0;
  border-color: var(--sl-fg);
  color: var(--sl-fg);
}
html[data-theme="suckless"] .ticker-track a, html[data-theme="suckless-dark"] .ticker-track a { color: var(--sl-dim); }
html[data-theme="suckless"] .ticker-track a:hover, html[data-theme="suckless-dark"] .ticker-track a:hover { color: var(--sl-accent); }

/* 筛选条 */
html[data-theme="suckless"] .filter-group + .filter-group, html[data-theme="suckless-dark"] .filter-group + .filter-group { border-left-color: var(--sl-fg); }
html[data-theme="suckless"] .chip, html[data-theme="suckless-dark"] .chip {
  border-radius: 0;
  border-color: var(--sl-fg);
  color: var(--sl-fg);
  background: var(--sl-bg);
}
html[data-theme="suckless"] .chip:hover, html[data-theme="suckless-dark"] .chip:hover { border-color: var(--sl-fg); }
html[data-theme="suckless"] .chip.active, html[data-theme="suckless-dark"] .chip.active { background: var(--sl-fg); color: var(--sl-bg); border-color: var(--sl-fg); }
html[data-theme="suckless"] .search-wrap input, html[data-theme="suckless-dark"] .search-wrap input {
  border-radius: 0;
  border-color: var(--sl-fg);
  background: var(--sl-bg);
  color: var(--sl-fg);
}
html[data-theme="suckless"] .search-wrap input:focus, html[data-theme="suckless-dark"] .search-wrap input:focus { border-color: var(--sl-accent); }

/* 头条 / 热榜 / 卡片 */
html[data-theme="suckless"] .hero, html[data-theme="suckless-dark"] .hero,
html[data-theme="suckless"] .hot-panel, html[data-theme="suckless-dark"] .hot-panel,
html[data-theme="suckless"] .card, html[data-theme="suckless-dark"] .card {
  background: var(--sl-bg);
  box-shadow: none;
  border-color: var(--sl-fg);
}
html[data-theme="suckless"] .hero, html[data-theme="suckless-dark"] .hero { border-width: 2px; }
html[data-theme="suckless"] .hero:hover, html[data-theme="suckless-dark"] .hero:hover,
html[data-theme="suckless"] .card:hover, html[data-theme="suckless-dark"] .card:hover { transform: none; box-shadow: none; }
html[data-theme="suckless"] .hero::after, html[data-theme="suckless-dark"] .hero::after { display: none; }
html[data-theme="suckless"] .card .card-top, html[data-theme="suckless-dark"] .card .card-top { border-top-color: var(--sl-fg); }
html[data-theme="suckless"] .hero-cover, html[data-theme="suckless-dark"] .hero-cover,
html[data-theme="suckless"] .card-cover, html[data-theme="suckless-dark"] .card-cover { border-radius: 0; background: var(--sl-bg); }
html[data-theme="suckless"] .card-title, html[data-theme="suckless-dark"] .card-title { color: var(--sl-fg); }
html[data-theme="suckless"] .card-link:hover .card-title, html[data-theme="suckless-dark"] .card-link:hover .card-title { color: var(--sl-accent); text-decoration: underline; text-underline-offset: 3px; }
html[data-theme="suckless"] .card-desc, html[data-theme="suckless-dark"] .card-desc { color: var(--sl-dim); }

/* 徽章 */
html[data-theme="suckless"] .badge, html[data-theme="suckless-dark"] .badge { border-radius: 0; }
html[data-theme="suckless"] .badge-src, html[data-theme="suckless-dark"] .badge-src { color: var(--sl-dim); border-color: var(--sl-fg); background: var(--sl-bg); }
html[data-theme="suckless"] .badge-cat, html[data-theme="suckless-dark"] .badge-cat {
  color: var(--sl-fg);
  border-color: var(--sl-fg);
  background: var(--sl-bg);
}
html[data-theme="suckless"] .badge-new, html[data-theme="suckless-dark"] .badge-new { color: var(--sl-live); border-color: var(--sl-live); background: var(--sl-bg); }
html[data-theme="suckless"] .badge-live, html[data-theme="suckless-dark"] .badge-live { background: var(--sl-fg); color: var(--sl-bg); }
html[data-theme="suckless"] .badge-heat, html[data-theme="suckless-dark"] .badge-heat { color: var(--sl-accent); border-color: var(--sl-accent); }

/* 阅读 / 评论按钮 */
html[data-theme="suckless"] .read-toggle, html[data-theme="suckless-dark"] .read-toggle,
html[data-theme="suckless"] .comment-toggle, html[data-theme="suckless-dark"] .comment-toggle,
html[data-theme="suckless"] .card-open, html[data-theme="suckless-dark"] .card-open {
  border-radius: 0;
  border-color: var(--sl-fg);
  color: var(--sl-dim);
  background: var(--sl-bg);
}
html[data-theme="suckless"] .card-open, html[data-theme="suckless-dark"] .card-open { color: var(--sl-accent); }
html[data-theme="suckless"] .read-toggle:hover, html[data-theme="suckless-dark"] .read-toggle:hover,
html[data-theme="suckless"] .comment-toggle:hover, html[data-theme="suckless-dark"] .comment-toggle:hover,
html[data-theme="suckless"] .card-open:hover, html[data-theme="suckless-dark"] .card-open:hover { background: var(--sl-fg); color: var(--sl-bg); border-color: var(--sl-fg); }

/* 骨架屏 */
html[data-theme="suckless"] .skeleton, html[data-theme="suckless-dark"] .skeleton { border-radius: 0; }
html[data-theme="suckless"] .sk-line, html[data-theme="suckless-dark"] .sk-line { border-radius: 0; background: var(--sl-skel); }

/* 加载更多 / 返回顶部 / 来源状态 */
html[data-theme="suckless"] .load-more, html[data-theme="suckless-dark"] .load-more {
  border-radius: 0;
  border-color: var(--sl-fg);
  color: var(--sl-fg);
  background: var(--sl-bg);
}
html[data-theme="suckless"] .load-more:hover, html[data-theme="suckless-dark"] .load-more:hover { background: var(--sl-fg); color: var(--sl-bg); }
html[data-theme="suckless"] .back-top, html[data-theme="suckless-dark"] .back-top {
  border-radius: 0;
  border-color: var(--sl-fg);
  background: var(--sl-bg);
  color: var(--sl-fg);
  box-shadow: none;
}
html[data-theme="suckless"] .src-chip, html[data-theme="suckless-dark"] .src-chip { border-radius: 0; border-color: var(--sl-fg); color: var(--sl-dim); }

/* 主题下拉 */
html[data-theme="suckless"] .theme-panel, html[data-theme="suckless-dark"] .theme-panel {
  border-radius: 0;
  border-color: var(--sl-fg);
  background: var(--sl-bg);
  box-shadow: none;
}
html[data-theme="suckless"] .theme-opt, html[data-theme="suckless-dark"] .theme-opt { border-radius: 0; }
html[data-theme="suckless"] .theme-opt:hover, html[data-theme="suckless-dark"] .theme-opt:hover { background: var(--sl-bg-soft); color: var(--sl-fg); }
html[data-theme="suckless"] .theme-opt.active, html[data-theme="suckless-dark"] .theme-opt.active { background: var(--sl-fg); color: var(--sl-bg); }
html[data-theme="suckless"] .theme-swatch, html[data-theme="suckless-dark"] .theme-swatch { border-radius: 0; border-color: var(--sl-fg); }

/* 页脚 */
html[data-theme="suckless"] .site-footer, html[data-theme="suckless-dark"] .site-footer { border-top: 2px solid var(--sl-fg); }

/* 站内阅读浮层 */
html[data-theme="suckless"] .reader-panel, html[data-theme="suckless-dark"] .reader-panel { border-radius: 0; border: 2px solid var(--sl-fg); background: var(--sl-bg); box-shadow: none; }
html[data-theme="suckless"] .reader-body a, html[data-theme="suckless-dark"] .reader-body a,
html[data-theme="suckless"] .reader-foot a, html[data-theme="suckless-dark"] .reader-foot a { color: var(--sl-accent); }

/* 链接页 */
html[data-theme="suckless"] .links-col, html[data-theme="suckless-dark"] .links-col { border-radius: 0; border-color: var(--sl-fg); background: var(--sl-bg); }
html[data-theme="suckless"] .link-item .li-icon, html[data-theme="suckless-dark"] .link-item .li-icon { border-radius: 0; border-color: var(--sl-fg); background: var(--sl-bg); }
html[data-theme="suckless"] .link-item:hover .li-name, html[data-theme="suckless-dark"] .link-item:hover .li-name { color: var(--sl-accent); }
html[data-theme="suckless"] .li-arrow, html[data-theme="suckless-dark"] .li-arrow { color: var(--sl-accent); }

/* 历史页 */
html[data-theme="suckless"] .era-detail .ed-card, html[data-theme="suckless-dark"] .era-detail .ed-card {
  border: 2px solid var(--sl-fg);
  border-radius: 0;
  background: var(--sl-bg);
  box-shadow: none;
}
html[data-theme="suckless"] .ed-title, html[data-theme="suckless-dark"] .ed-title { color: var(--sl-fg); }
html[data-theme="suckless"] .ed-period, html[data-theme="suckless-dark"] .ed-period { border-radius: 0; }
html[data-theme="suckless"] .ed-label, html[data-theme="suckless-dark"] .ed-label { color: var(--sl-faint); }
html[data-theme="suckless"] .ed-back, html[data-theme="suckless-dark"] .ed-back {
  border-radius: 0;
  border-color: var(--sl-fg);
  color: var(--sl-fg);
  background: var(--sl-bg);
}
html[data-theme="suckless"] .ed-back:hover, html[data-theme="suckless-dark"] .ed-back:hover { background: var(--sl-fg); color: var(--sl-bg); }

/* 课程页 */
html[data-theme="suckless"] .lesson, html[data-theme="suckless-dark"] .lesson {
  border: 2px solid var(--sl-fg);
  border-top: 2px solid var(--sl-fg);
  border-radius: 0;
  background: var(--sl-bg);
  box-shadow: none;
}
html[data-theme="suckless"] .lesson-no, html[data-theme="suckless-dark"] .lesson-no,
html[data-theme="suckless"] .l-block-label, html[data-theme="suckless-dark"] .l-block-label { color: var(--sl-fg); }
html[data-theme="suckless"] .l-list li::marker, html[data-theme="suckless-dark"] .l-list li::marker { color: var(--sl-fg); }
html[data-theme="suckless"] .lesson-toc-chips a, html[data-theme="suckless-dark"] .lesson-toc-chips a { border-radius: 0; border-color: var(--sl-fg); color: var(--sl-dim); }
html[data-theme="suckless"] .lesson-toc-chips a:hover, html[data-theme="suckless-dark"] .lesson-toc-chips a:hover { color: var(--sl-accent); }
html[data-theme="suckless"] .lg-wrap, html[data-theme="suckless-dark"] .lg-wrap { border-color: var(--sl-fg); border-radius: 0; background: var(--sl-bg); }
html[data-theme="suckless"] .lg-table th, html[data-theme="suckless-dark"] .lg-table th { background: var(--sl-bg); color: var(--sl-fg); }
html[data-theme="suckless"] .lg-table th, html[data-theme="suckless-dark"] .lg-table th, html[data-theme="suckless"] .lg-table td, html[data-theme="suckless-dark"] .lg-table td { border-color: var(--sl-fg); }
html[data-theme="suckless"] .l-callout, html[data-theme="suckless-dark"] .l-callout { border-color: var(--sl-fg); background: var(--sl-bg); border-radius: 0; }
html[data-theme="suckless"] .l-callout-head, html[data-theme="suckless-dark"] .l-callout-head { color: var(--sl-fg); }
html[data-theme="suckless"] .l-term, html[data-theme="suckless-dark"] .l-term { background: var(--sl-bg); border-color: var(--sl-fg); border-radius: 0; }
html[data-theme="suckless"] .lesson-tags span, html[data-theme="suckless-dark"] .lesson-tags span { color: var(--sl-fg); border-color: var(--sl-fg); }
html[data-theme="suckless"] .lesson-part, html[data-theme="suckless-dark"] .lesson-part { border: 2px solid var(--sl-fg); border-top: 2px solid var(--sl-fg); border-radius: 0; background: var(--sl-bg); box-shadow: none; }
html[data-theme="suckless"] .lesson-part-no, html[data-theme="suckless-dark"] .lesson-part-no { color: var(--sl-fg); }
html[data-theme="suckless"] .lesson-toc-part, html[data-theme="suckless-dark"] .lesson-toc-part { color: var(--sl-fg); }
html[data-theme="suckless"] .l-fig, html[data-theme="suckless-dark"] .l-fig { border-color: var(--sl-fg); border-radius: 0; background: var(--sl-bg); }
html[data-theme="suckless"] .l-fig img, html[data-theme="suckless-dark"] .l-fig img { border-color: var(--sl-fg); }
html[data-theme="suckless"] .l-fig figcaption, html[data-theme="suckless-dark"] .l-fig figcaption { color: var(--sl-dim); }
html[data-theme="suckless"] .l-fig-credit, html[data-theme="suckless-dark"] .l-fig-credit { color: var(--sl-faint); }
html[data-theme="suckless"] .l-code, html[data-theme="suckless-dark"] .l-code { border: 2px solid var(--sl-fg); border-left: 2px solid var(--sl-fg); border-radius: 0; background: var(--sl-bg); color: var(--sl-fg); }
html[data-theme="suckless"] .l-code-copy, html[data-theme="suckless-dark"] .l-code-copy { border: 1px solid var(--sl-fg); border-radius: 0; background: var(--sl-bg); color: var(--sl-fg); }
html[data-theme="suckless"] .l-code-copy:hover, html[data-theme="suckless-dark"] .l-code-copy:hover { background: var(--sl-fg); color: var(--sl-bg); }
html[data-theme="suckless"] .l-code-copy.done, html[data-theme="suckless-dark"] .l-code-copy.done { color: var(--sl-accent); border-color: var(--sl-accent); }
html[data-theme="suckless"] .tut-nav, html[data-theme="suckless-dark"] .tut-nav,
html[data-theme="suckless"] .tut-head, html[data-theme="suckless-dark"] .tut-head,
html[data-theme="suckless"] .tut-panel, html[data-theme="suckless-dark"] .tut-panel { border-radius: 0; border-color: var(--sl-fg); background: var(--sl-bg); box-shadow: none; }
html[data-theme="suckless"] .tut-head, html[data-theme="suckless-dark"] .tut-head { border-top-color: var(--sl-fg); }
html[data-theme="suckless"] .tut-nav-group h4, html[data-theme="suckless-dark"] .tut-nav-group h4 { color: var(--sl-faint); }
html[data-theme="suckless"] .tut-nav-group a, html[data-theme="suckless-dark"] .tut-nav-group a { color: var(--sl-dim); }
html[data-theme="suckless"] .tut-nav-group a:hover, html[data-theme="suckless-dark"] .tut-nav-group a:hover { background: var(--sl-bg-soft); color: var(--sl-fg); }
html[data-theme="suckless"] .tut-nav-group a.active, html[data-theme="suckless-dark"] .tut-nav-group a.active { background: var(--sl-fg); color: var(--sl-bg); }
html[data-theme="suckless"] .tut-nav-group a.active .tut-no, html[data-theme="suckless-dark"] .tut-nav-group a.active .tut-no { color: var(--sl-bg); }
html[data-theme="suckless"] .tut-crumb a:hover, html[data-theme="suckless-dark"] .tut-crumb a:hover { color: var(--sl-accent); }
html[data-theme="suckless"] .tut-crumb .cur, html[data-theme="suckless-dark"] .tut-crumb .cur { color: var(--sl-fg); }
html[data-theme="suckless"] .lp-btn, html[data-theme="suckless-dark"] .lp-btn { border-color: var(--sl-fg); border-radius: 0; background: var(--sl-bg); color: var(--sl-fg); }
html[data-theme="suckless"] .lp-btn:hover, html[data-theme="suckless-dark"] .lp-btn:hover { background: var(--sl-fg); color: var(--sl-bg); }
html[data-theme="suckless"] .lp-dir, html[data-theme="suckless-dark"] .lp-dir { color: var(--sl-faint); }
html[data-theme="suckless"] .tut-panel-links a, html[data-theme="suckless-dark"] .tut-panel-links a { color: var(--sl-dim); }
html[data-theme="suckless"] .tut-panel-links a:hover, html[data-theme="suckless-dark"] .tut-panel-links a:hover { background: var(--sl-bg-soft); color: var(--sl-fg); }

/* ---------------- Responsive ---------------- */

@media (max-width: 980px) {
  .grid, .links-grid { grid-template-columns: repeat(2, 1fr); }
  .featured { grid-template-columns: 1fr; }
}

/* 移动端：头部两行（导航独立成行、可横滑），
   筛选 chips 每组一行横滑 + 搜索独占一行，杜绝芯片墙与头部溢出。 */
@media (max-width: 700px) {
  .container { padding: 0 14px; }

  /* Header */
  .header-inner {
    flex-wrap: wrap;
    height: auto;
    min-height: var(--header-h);
    padding: 8px 0;
    gap: 6px 10px;
  }
  .brand-tag { display: none; }
  .main-nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    gap: 6px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .main-nav::-webkit-scrollbar { display: none; }
  .main-nav a { flex-shrink: 0; padding: 6px 11px; font-size: 12.5px; }
  .live-label { display: none; }
  .live-wrap { gap: 6px; padding: 0; }
  .header-btn .btn-text { display: none; }
  .header-btn { padding: 7px 9px; }

  /* Filterbar: 每组一行横滑，搜索独占一行 */
  .filterbar { gap: 10px; padding: 14px 0 2px; }
  .filter-group {
    flex: 1 1 100%;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .filter-group::-webkit-scrollbar { display: none; }
  .filter-group .chip { flex-shrink: 0; }
  .filter-group + .filter-group { padding-left: 0; border-left: none; }
  .search-wrap { margin-left: 0; width: 100%; }
  .search-wrap input { width: 100%; }
  .search-wrap input:focus { width: 100%; }

  /* Featured / cards */
  .featured { gap: 14px; padding: 14px 0 2px; }
  .hero { padding: 20px 18px; }
  .hot-panel { padding: 16px 16px 6px; }
  .grid, .links-grid { grid-template-columns: 1fr; gap: 12px; }
  .card-title { font-size: 15.5px; line-height: 1.5; }
  .card .card-top { padding: 13px 14px 6px; }
  .card-link { padding: 0 14px; }
  .card-foot { padding: 10px 14px; }
  .section-head { margin: 22px 0 10px; }
}

@media (max-width: 420px) {
  .main-nav a { font-size: 12px; padding: 6px 9px; }
  .card-full { padding: 14px 14px 6px; }
  .reader-head { padding: 14px 16px 12px; }
  .reader-title { font-size: 19px; }
  .reader-body { padding: 18px 16px 24px; }
}

/* ---------------- Reduced motion ---------------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .ticker-track { animation: none; }
  html { scroll-behavior: auto; }
}

/* ============================================================
   CHAT PAGE — DeepSeek 风格（配色映射到站点主题 tokens）
   ============================================================ */

body[data-page="chat"] { overflow: hidden; }

.ds-app {
  --ds-bg: var(--bg);
  --ds-bg-2: var(--surface);
  --ds-bg-3: var(--surface-2);
  --ds-text: var(--text);
  --ds-text-2: var(--text-dim);
  --ds-text-3: var(--text-faint);
  --ds-accent: var(--accent);
  --ds-accent-hover: color-mix(in srgb, var(--accent) 84%, #000);
  --ds-accent-soft: color-mix(in srgb, var(--accent) 14%, transparent);
  --ds-border: var(--line);
  --ds-danger: var(--live);

  height: calc(100dvh - var(--header-h));
  display: flex;
  background: var(--ds-bg);
  color: var(--ds-text);
  font-family: var(--font-body);
  font-size: 14px;
}

/* ---------- Sidebar ---------- */

.ds-sidebar {
  width: 264px;
  flex-shrink: 0;
  background: var(--ds-bg-2);
  border-right: 1px solid var(--ds-border);
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.ds-sidebar-top {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.ds-new {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 10px 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent-contrast);
  background: var(--ds-accent);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.15s;
}
.ds-new:hover { background: var(--ds-accent-hover); }
.ds-new svg { width: 16px; height: 16px; }

.ds-search {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  background: var(--ds-bg-3);
  border-radius: 8px;
}
.ds-search svg { width: 14px; height: 14px; color: var(--ds-text-3); flex-shrink: 0; }
.ds-search input {
  width: 100%;
  border: none;
  outline: none;
  background: transparent;
  color: var(--ds-text);
  font: inherit;
  font-size: 13px;
}
.ds-search input::placeholder { color: var(--ds-text-3); }

.ds-conv-list {
  flex: 1;
  overflow-y: auto;
  padding: 2px 8px 8px;
  min-height: 0;
}

.ds-conv-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 9px 10px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--ds-text);
  font: inherit;
  font-size: 13.5px;
  text-align: left;
  cursor: pointer;
  margin-bottom: 2px;
}
.ds-conv-item:hover { background: var(--ds-bg-3); }
.ds-conv-item.active { background: var(--ds-accent-soft); color: var(--ds-accent); }
.ds-conv-item .ds-conv-ico {
  width: 22px; height: 22px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: var(--ds-accent-soft);
  color: var(--ds-accent);
}
.ds-conv-item .ds-conv-ico svg { width: 12px; height: 12px; }
.ds-conv-item .ds-conv-title {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.ds-conv-item .ds-conv-del {
  display: none;
  color: var(--ds-text-3);
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px;
}
.ds-conv-item:hover .ds-conv-del { display: inline-flex; }
.ds-conv-item .ds-conv-del svg { width: 13px; height: 13px; }

.ds-conv-empty { padding: 18px 10px; font-size: 12.5px; color: var(--ds-text-3); text-align: center; }

.ds-sidebar-bottom {
  border-top: 1px solid var(--ds-border);
  padding: 8px;
  display: flex;
  gap: 6px;
}
.ds-settings-btn {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--ds-text);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}
.ds-settings-btn:hover { background: var(--ds-bg-3); }
.ds-settings-btn svg { width: 16px; height: 16px; color: var(--ds-text-2); }

/* ---------- Main ---------- */

.ds-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  position: relative;
}

.ds-topbar {
  height: 50px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  border-bottom: 1px solid var(--ds-border);
  background: var(--ds-bg);
}

.ds-burger { display: none; width: 34px; height: 34px; border: none; border-radius: 8px; background: transparent; color: var(--ds-text-2); cursor: pointer; align-items: center; justify-content: center; }
.ds-burger:hover { background: var(--ds-bg-3); color: var(--ds-text); }
.ds-burger svg { width: 18px; height: 18px; }

.ds-model {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--ds-text);
  font: inherit;
  font-size: 14.5px;
  font-weight: 600;
  cursor: pointer;
}
.ds-model:hover { background: var(--ds-bg-3); }
.ds-logo {
  width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 6px;
  background: var(--ds-accent);
  color: var(--accent-contrast);
}
.ds-logo svg { width: 13px; height: 13px; }
.ds-caret { width: 14px; height: 14px; color: var(--ds-text-2); }
.ds-mode-badge {
  margin-left: auto;
  font-size: 11.5px;
  color: var(--ds-text-2);
  border: 1px solid var(--ds-border);
  border-radius: 999px;
  padding: 3px 10px;
  font-family: var(--font-mono);
}

/* ---------- Chat area ---------- */

.ds-chat {
  flex: 1;
  overflow-y: auto;
  position: relative;
  min-height: 0;
}

.ds-messages {
  max-width: 768px;
  margin: 0 auto;
  padding: 24px 20px 40px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.ds-empty {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 6px;
  padding: 0 20px;
}
.ds-empty.hidden { display: none; }
.ds-greeting {
  font-family: var(--font-display);
  font-size: clamp(20px, 4vw, 30px);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.ds-empty-sub { color: var(--ds-text-2); font-size: 13px; margin-top: 2px; }

.ds-suggest-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 22px;
  max-width: 620px;
  width: 100%;
}
.ds-suggest-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--ds-bg-2);
  border: 1px solid var(--ds-border);
  border-radius: 16px;
  cursor: pointer;
  text-align: left;
  font: inherit;
  color: var(--ds-text);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.ds-suggest-card:hover { border-color: var(--ds-accent); box-shadow: var(--shadow); }
.ds-sug-icon {
  width: 34px; height: 34px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  border-radius: 10px;
  background: var(--ds-accent-soft);
  color: var(--ds-accent);
}
.ds-sug-icon svg { width: 17px; height: 17px; }
.ds-sug-text { font-size: 13.5px; line-height: 1.5; }

/* ---------- Messages ---------- */

.ds-msg { display: flex; flex-direction: column; gap: 5px; }
.ds-msg.user { align-items: flex-end; }
.ds-msg.assistant { align-items: flex-start; }
.ds-msg-model {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ds-text-3);
}
.ds-msg.user .ds-msg-model { text-align: right; }
.ds-msg-inner {
  font-size: 15px;
  line-height: 1.75;
  max-width: 100%;
  overflow-wrap: break-word;
  word-break: break-word;
}
.ds-msg.user .ds-msg-inner {
  background: var(--ds-bg-3);
  border-radius: 16px 16px 4px 16px;
  padding: 10px 14px;
}
.ds-msg.assistant .ds-msg-inner { color: var(--ds-text); }
.ds-msg.error .ds-msg-inner { color: var(--ds-danger); }
.ds-msg.streaming .ds-msg-inner::after {
  content: "▍";
  color: var(--ds-accent);
  animation: ds-blink 1s infinite;
}
@keyframes ds-blink { 50% { opacity: 0; } }

.ds-msg-inner code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--ds-bg-3);
  padding: 1px 5px;
  border-radius: 5px;
}
.ds-msg.user .ds-msg-inner code { background: color-mix(in srgb, var(--ds-text) 10%, transparent); color: inherit; }
.ds-msg-inner pre.ds-code {
  background: var(--ds-bg-3);
  border: 1px solid var(--ds-border);
  border-radius: 10px;
  padding: 12px 14px;
  overflow-x: auto;
  margin: 8px 0;
  font-size: 13px;
  line-height: 1.6;
  position: relative;
}
.ds-msg-inner pre.ds-code .ds-code-copy {
  position: absolute;
  top: 6px;
  right: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ds-text-3);
  background: var(--ds-bg-2);
  border: 1px solid var(--ds-border);
  border-radius: 6px;
  padding: 3px 8px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s, color 0.15s, border-color 0.15s;
}
.ds-msg-inner pre.ds-code:hover .ds-code-copy,
.ds-msg-inner pre.ds-code .ds-code-copy:focus-visible { opacity: 1; }
.ds-msg-inner pre.ds-code .ds-code-copy:hover { color: var(--ds-accent); border-color: var(--ds-accent); }
.ds-msg-inner pre.ds-code code { background: transparent; padding: 0; }
.ds-msg-inner pre.ds-code .tok-c { color: var(--tok-comment); font-style: italic; }
.ds-msg-inner pre.ds-code .tok-s { color: var(--tok-str); }
.ds-msg-inner pre.ds-code .tok-k { color: var(--tok-key); font-weight: 600; }
.ds-msg-inner pre.ds-code .tok-b { color: var(--tok-builtin); }
.ds-msg-inner pre.ds-code .tok-n { color: var(--tok-num); }
.ds-msg-inner h4 { font-size: 15px; margin: 10px 0 4px; }
.ds-msg-inner details.ds-reasoning {
  margin: 0 0 8px;
  padding: 8px 10px;
  background: var(--ds-bg-3);
  border: 1px solid var(--ds-border);
  border-radius: 10px;
  font-size: 12.5px;
  color: var(--ds-text-2);
}
.ds-msg-inner details.ds-reasoning summary { cursor: pointer; font-weight: 500; }
.ds-msg-inner details.ds-reasoning > div { margin-top: 6px; line-height: 1.7; color: var(--ds-text); }

.ds-copy {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ds-text-3);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  align-self: flex-start;
}
.ds-copy:hover { color: var(--ds-accent); }
.ds-msg.user .ds-copy { align-self: flex-end; }

/* ---------- Composer ---------- */

.ds-composer-wrap {
  flex-shrink: 0;
  padding: 6px 16px 14px;
  background: var(--ds-bg);
}
.ds-composer {
  max-width: 768px;
  margin: 0 auto;
  background: var(--ds-bg-2);
  border: 1px solid var(--ds-border);
  border-radius: 16px;
  padding: 10px 12px 8px;
  box-shadow: var(--shadow);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.ds-composer:focus-within { border-color: var(--ds-accent); box-shadow: 0 2px 12px color-mix(in srgb, var(--ds-accent) 22%, transparent); }
.ds-composer textarea {
  width: 100%;
  border: none;
  outline: none;
  background: transparent;
  color: var(--ds-text);
  font: inherit;
  font-size: 15px;
  line-height: 1.6;
  resize: none;
  max-height: 200px;
}
.ds-composer-tools {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 4px;
}
.ds-tool {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font: inherit;
  font-size: 12.5px;
  color: var(--ds-text-2);
  padding: 5px 10px;
  border: none;
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.ds-tool:hover { background: var(--ds-bg-3); color: var(--ds-text); }
.ds-tool.on { color: var(--ds-accent); background: var(--ds-accent-soft); }
.ds-tool.disabled { opacity: 0.4; pointer-events: none; }
.ds-tool svg { width: 15px; height: 15px; }
.ds-send {
  margin-left: auto;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: var(--ds-accent);
  color: var(--accent-contrast);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0.55;
  transition: opacity 0.15s, background 0.15s;
}
.ds-send.ready { opacity: 1; }
.ds-send:hover { background: var(--ds-accent-hover); }
.ds-send.stop { background: var(--ds-danger); }
.ds-send svg { width: 16px; height: 16px; }
.ds-disclaimer {
  text-align: center;
  font-size: 11.5px;
  color: var(--ds-text-3);
  margin-top: 8px;
}

/* ---------- Model menu ---------- */

.ds-model-menu {
  position: absolute;
  top: 52px;
  left: 16px;
  width: 300px;
  background: var(--ds-bg-2);
  border: 1px solid var(--ds-border);
  border-radius: 12px;
  padding: 8px;
  box-shadow: var(--shadow-hover);
  z-index: 90;
}
.ds-model-menu[hidden] { display: none; }
.ds-model-group + .ds-model-group { margin-top: 6px; padding-top: 8px; border-top: 1px solid var(--ds-border); }
.ds-model-group-title {
  font-size: 11px;
  font-weight: 500;
  color: var(--ds-text-3);
  padding: 4px 10px 6px;
}
.ds-model-menu button {
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 100%;
  padding: 9px 10px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--ds-text);
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.ds-model-menu button:hover { background: var(--ds-bg-3); }
.ds-model-menu button.active { background: var(--ds-accent-soft); }
.ds-opt-name { font-size: 13.5px; font-weight: 500; }
.ds-opt-desc { font-size: 11.5px; color: var(--ds-text-3); }

/* ---------- Dialog ---------- */

.ds-dialog {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.ds-dialog[hidden] { display: none; }
.ds-dialog-panel {
  width: min(480px, 100%);
  background: var(--ds-bg-2);
  border: 1px solid var(--ds-border);
  border-radius: 16px;
  padding: 20px;
  max-height: 82vh;
  overflow-y: auto;
}
.ds-dialog-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.ds-dialog-head h2 { font-family: var(--font-display); font-size: 18px; }
.ds-dialog-close {
  width: 30px; height: 30px;
  display: flex; align-items: center; justify-content: center;
  border: none; border-radius: 8px;
  background: transparent; color: var(--ds-text-2);
  cursor: pointer;
}
.ds-dialog-close:hover { background: var(--ds-bg-3); color: var(--ds-text); }
.ds-dialog-close svg { width: 16px; height: 16px; }

.ds-form-group { margin-bottom: 20px; }
.ds-form-group > label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 8px;
}
.ds-radio-row { display: flex; flex-direction: column; gap: 8px; }
.ds-radio {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--ds-border);
  border-radius: 12px;
  background: var(--ds-bg-3);
  color: var(--ds-text);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.ds-radio.active { border-color: var(--ds-accent); background: var(--ds-accent-soft); }
.ds-radio-dot {
  width: 16px; height: 16px; flex-shrink: 0;
  margin-top: 2px;
  border-radius: 50%;
  border: 2px solid var(--ds-text-3);
  box-sizing: border-box;
}
.ds-radio.active .ds-radio-dot {
  border-color: var(--ds-accent);
  background: var(--ds-accent);
  box-shadow: inset 0 0 0 2px var(--ds-bg-2);
}
.ds-radio b { display: block; font-size: 14px; font-weight: 600; }
.ds-radio em { display: block; font-style: normal; font-size: 12px; color: var(--ds-text-2); margin-top: 2px; }

.ds-key-row { display: flex; gap: 8px; }
.ds-key-row input {
  flex: 1;
  padding: 9px 12px;
  border: 1px solid var(--ds-border);
  border-radius: 10px;
  background: var(--ds-bg-3);
  color: var(--ds-text);
  font: inherit;
  font-family: var(--font-mono);
  font-size: 13px;
  outline: none;
}
.ds-key-row input:focus { border-color: var(--ds-accent); }
.ds-key-toggle, .ds-save-key {
  padding: 8px 14px;
  border-radius: 10px;
  border: 1px solid var(--ds-border);
  background: var(--ds-bg-3);
  color: var(--ds-text);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
}
.ds-key-toggle:hover { color: var(--ds-text); }
.ds-save-key {
  background: var(--ds-accent);
  border-color: var(--ds-accent);
  color: var(--accent-contrast);
  margin-top: 10px;
}
.ds-save-key:hover { background: var(--ds-accent-hover); }
.ds-hint { font-size: 12px; color: var(--ds-text-2); line-height: 1.6; margin: 6px 0 0; }
#ds-key-status { color: var(--ds-accent); }

/* ---------- Toast ---------- */

.ds-toast {
  position: fixed;
  left: 50%;
  bottom: 120px;
  transform: translateX(-50%);
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-hover);
  font-size: 13px;
  padding: 10px 16px;
  border-radius: 10px;
  z-index: 300;
  max-width: min(420px, calc(100vw - 32px));
}
.ds-toast[hidden] { display: none; }

/* ---------- Scrollbars ---------- */

.ds-conv-list::-webkit-scrollbar, .ds-chat::-webkit-scrollbar { width: 6px; }
.ds-conv-list::-webkit-scrollbar-thumb, .ds-chat::-webkit-scrollbar-thumb { background: var(--ds-border); border-radius: 3px; }

/* ---------- Mobile ---------- */

@media (max-width: 820px) {
  .ds-burger { display: inline-flex; }
  .ds-sidebar {
    position: fixed;
    left: 0;
    top: var(--header-h);
    bottom: 0;
    width: 264px;
    z-index: 150;
    transform: translateX(-105%);
    transition: transform 0.22s ease;
    box-shadow: var(--shadow-hover);
  }
  .ds-app.sidebar-open .ds-sidebar { transform: none; }
  .ds-app.sidebar-open::before {
    content: "";
    position: fixed;
    inset: var(--header-h) 0 0 0;
    background: rgba(0, 0, 0, 0.35);
    z-index: 140;
  }
  .ds-suggest-grid { grid-template-columns: 1fr; }
}