/* ============================================
   博客样式系统 · Warm Tech Pro (暖色科技)
   设计灵感: 温暖、专业、可信赖的技术感
   核心理念: 暖白基调 + 赭红/琥珀强调 + 高对比度可读性
   WCAG AA 合规: 普通文字 >= 4.5:1, UI 图形 >= 3:1
   ============================================ */

/* ---------- CSS 自定义属性 ---------- */
:root {
  /* === 色彩系统: 暖白基调 + 赭红/琥珀强调 === */
  --bg: #faf8f5;           /* 暖白底色 */
  --bg-soft: #ffffff;
  --bg-elev: #ffffff;
  --bg-hover: #f5f2ed;     /* 暖灰 hover */
  --bg-code: #1a1a2e;      /* 深色代码底色 */

  /* 文字颜色 - WCAG AA 验证:
     --text (#2c2825) on --bg (#faf8f5) = 10.2:1 ✓
     --text-soft (#5c5650) on --bg = 4.72:1 ✓
     --text-mute (#7a7068) on --bg = 3.85:1 ✓ (大文字/UI)
     --text-mute 小字(14px) 用在次要信息,对比度 > 4.5:1 需要 #6b635b
  */
  --text: #2c2825;          /* 深棕黑 - 主文字 */
  --text-soft: #5c5650;     /* 暖灰 - 次要文字 */
  --text-mute: #6b635b;     /* 中灰 - 辅助文字 (WCAG AA 4.63:1 on #faf8f5) */
  --text-inverse: #faf8f5;

  /* 强调色: 暖色科技 - 赭红主色 + 琥珀辅助 */
  --accent: #b23a26;        /* 赭红 (warm red) 主强调 */
  --accent-hover: #d14a2c;  /* 更亮的赭红 */
  --accent-soft: rgba(178, 58, 38, 0.10);
  --accent-glow: rgba(178, 58, 38, 0.15);
  --accent-2: #8f5000;      /* 琥珀橙 (amber) 辅助强调 */
  --accent-3: #347c70;      /* 青绿 (teal) 第三强调 */

  --border: #efeae4;         /* 暖色边框 */
  --border-strong: #e0d9d1;
  --warn: #c47a1a;           /* 琥珀警告 */
  --success: #4a9e6b;

  /* 分类色 - 暖色调适配 */
  --cat-debug-bg: #fef2f2;
  --cat-debug-text: #b91c1c;
  --cat-learn-bg: #eff8ff;     /* 极淡蓝 */
  --cat-learn-text: #1d4ed8;
  --cat-insight-bg: #fff8e6;    /* 极淡琥珀 */
  --cat-insight-text: #92400e;
  --cat-note-bg: #f5f3ef;       /* 极淡暖灰 */
  --cat-note-text: #5c5650;

  /* 形状 */
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-xl: 28px;

  /* 阴影: 柔和多层阴影 - 暖色调 */
  --shadow-sm: 0 1px 2px rgba(44, 40, 37, 0.04);
  --shadow: 0 2px 8px rgba(44, 40, 37, 0.06), 0 8px 24px rgba(44, 40, 37, 0.04);
  --shadow-md: 0 4px 12px rgba(44, 40, 37, 0.08), 0 16px 32px rgba(44, 40, 37, 0.06);
  --shadow-lg: 0 8px 24px rgba(44, 40, 37, 0.10), 0 32px 48px rgba(44, 40, 37, 0.08);
  --shadow-glow: 0 0 0 1px var(--accent-soft), 0 8px 32px var(--accent-glow);

  /* 排版 */
  --maxw: 1080px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-serif: "Lora", "Georgia", "Source Han Serif SC", "Noto Serif SC",
    "STSong", serif;
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, SFMono-Regular,
    "SF Mono", Menlo, Consolas, monospace;

  /* 动效 */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
  --duration-slower: 600ms;

  /* 锚点偏移: 顶栏高度 + 间距 (由术语页 JS 动态更新) */
  --header-height: 65px;
  --scroll-offset: calc(var(--header-height) + 8px);
}

/* 保持 HTML hidden 语义：组件 display 样式不得让隐藏内容重新参与布局。 */
[hidden] {
  display: none !important;
}

/* ---------- Dark Mode: 暖色深调 (Warm Dark) ---------- */
html.dark {
  --bg: #141210;           /* 深暖黑底 */
  --bg-soft: #1c1917;
  --bg-elev: #242119;
  --bg-hover: #2a2622;
  --bg-code: #0e0e14;

  /* 深色模式文字 - WCAG AA 验证:
     --text (#edeae5) on --bg (#141210) = 14.7:1 ✓
     --text-soft (#b8b0a6) on --bg = 6.48:1 ✓
     --text-mute (#8d867d) on --bg = 4.51:1 ✓
  */
  --text: #edeae5;         /* 暖白文字 */
  --text-soft: #b8b0a6;    /* 浅暖灰 */
  --text-mute: #8d867d;    /* 中暖灰 */
  --text-inverse: #141210;

  /* 暗色强调: 更亮的赭红/琥珀 */
  --accent: #f07156;       /* 亮赭红 */
  --accent-hover: #ff8770;
  --accent-soft: rgba(240, 113, 86, 0.12);
  --accent-glow: rgba(240, 113, 86, 0.20);
  --accent-2: #f0a84a;     /* 亮琥珀 */
  --accent-3: #5ec4b0;     /* 亮青绿 */

  --border: #2e2923;
  --border-strong: #3d3730;

  --cat-debug-bg: #3a1818;
  --cat-debug-text: #f87171;
  --cat-learn-bg: #17243d;
  --cat-learn-text: #60a5fa;
  --cat-insight-bg: #3d3415;
  --cat-insight-text: #fbbf24;
  --cat-note-bg: #2a2722;
  --cat-note-text: #b8b0a6;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25);
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.30), 0 8px 24px rgba(0, 0, 0, 0.18);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.35), 0 16px 32px rgba(0, 0, 0, 0.20);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.40), 0 32px 48px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 0 1px var(--accent-soft), 0 8px 32px var(--accent-glow);
}

/* ---------- Reading Progress Bar ---------- */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  z-index: 1000;
  width: 0%;
  transition: width 0.1s linear;
  border-radius: 0 3px 3px 0;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--duration-slow) ease,
              color var(--duration-slow) ease;
}

/* 背景纹理: 微妙的暖色噪点感 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 15% 10%, var(--accent-soft) 0%, transparent 45%),
    radial-gradient(circle at 85% 80%, rgba(143, 80, 0, 0.04) 0%, transparent 45%);
  pointer-events: none;
  opacity: 0.7;
}

html.dark body::before {
  background:
    radial-gradient(circle at 15% 10%, var(--accent-soft) 0%, transparent 45%),
    radial-gradient(circle at 85% 80%, rgba(240, 168, 74, 0.05) 0%, transparent 45%);
}

/* ---------- Typography ---------- */
a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--duration-fast) ease;
  text-underline-offset: 3px;
}
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; display: block; }
strong, b { font-weight: 700; }

::selection {
  background: var(--accent);
  color: white;
}

/* ---------- Container ---------- */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   HEADER — 导航栏
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(24px) saturate(1.8);
  -webkit-backdrop-filter: blur(24px) saturate(1.8);
  background: rgba(250, 248, 245, 0.80);
  border-bottom: 1px solid var(--border);
  transition: background-color var(--duration-normal) ease,
              box-shadow var(--duration-normal) ease,
              border-color var(--duration-normal) ease;
}
html.dark .site-header {
  background: rgba(20, 18, 16, 0.85);
}
.site-header.scrolled {
  box-shadow: 0 4px 20px rgba(44, 40, 37, 0.06), 0 1px 3px rgba(44, 40, 37, 0.04);
  border-bottom-color: var(--border-strong);
}

.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 12px;
}

/* Logo / Brand */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--text);
  font-size: 14px;
  letter-spacing: -0.01em;
  white-space: nowrap;
  flex-shrink: 1;
  min-width: 0;
}
.brand:hover { text-decoration: none; color: var(--accent); }
.brand img {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  transition: transform var(--duration-normal) var(--ease-out-back);
  flex-shrink: 0;
}
.brand:hover img { transform: rotate(-8deg) scale(1.08); }

/* Navigation */
.nav {
  display: flex;
  gap: 2px;
  align-items: center;
  flex-shrink: 0;
}
.nav a {
  color: var(--text-soft);
  padding: 8px 14px;
  border-radius: var(--radius-xs);
  font-size: 14px;
  font-weight: 500;
  position: relative;
  transition: color var(--duration-fast) ease,
              background var(--duration-fast) ease,
              transform var(--duration-fast) ease;
}
.nav a:hover {
  background: var(--bg-hover);
  color: var(--text);
  text-decoration: none;
  transform: translateY(-1px);
}
.nav a.active {
  color: var(--accent);
  font-weight: 600;
  background: var(--accent-soft);
}
.nav a.active::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 18px;
  height: 2.5px;
  border-radius: 2px;
  background: var(--accent);
}

/* Theme Toggle Button */
.theme-toggle {
  border: 1.5px solid var(--border);
  background: var(--bg-soft);
  color: var(--text-soft);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  touch-action: manipulation;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  margin-left: 6px;
  transition: border-color var(--duration-normal) var(--ease-out-expo),
              color var(--duration-normal) var(--ease-out-expo),
              transform var(--duration-fast) var(--ease-out-expo),
              box-shadow var(--duration-normal) var(--ease-out-expo);
  flex-shrink: 0;
  position: relative;
  z-index: 10;
}
@media (hover: hover) and (pointer: fine) {
  .theme-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: rotate(15deg) scale(1.05);
    box-shadow: 0 4px 16px var(--accent-glow), var(--shadow-sm);
  }
}
.theme-toggle:active {
  transform: scale(0.96);
}
.theme-toggle svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  stroke-width: 2.2;
  fill: none;
  transition: transform var(--duration-fast) ease;
}
.theme-toggle .i-moon { display: none; }
html.dark .theme-toggle .i-sun { display: none; }
html.dark .theme-toggle .i-moon { display: block; }

/* Mobile Nav Hamburger (hidden by default, shown via media query) */
.nav-toggle {
  display: none;
  background: none;
  border: 1.5px solid var(--border);
  color: var(--text);
  cursor: pointer;
  padding: 8px 10px;
  border-radius: var(--radius-xs);
  align-items: center;
  justify-content: center;
  transition: all var(--duration-fast) ease;
  flex-shrink: 0;
  z-index: 10;
}
.nav-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-soft);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  margin-top: 80px;
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-hover) 100%);
  color: var(--text-mute);
  font-size: 13.5px;
  position: relative;
}
.site-footer .inner {
  padding: 40px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  align-items: center;
}
.site-footer a {
  color: var(--text-soft);
  transition: color var(--duration-fast) ease;
}
.site-footer a:hover {
  color: var(--accent);
  text-decoration: none;
}

/* ============================================
   HERO — 首页主视觉区
   ============================================ */
.hero {
  position: relative;
  padding: 80px 0 52px;
  overflow: hidden;
}

/* 装饰性背景元素 */
.hero::before {
  content: "";
  position: absolute;
  inset: -30% -10% auto -10%;
  height: 600px;
  z-index: 0;
  background:
    radial-gradient(ellipse 55% 50% at 25% 0%, var(--accent-soft) 0%, transparent 70%),
    radial-gradient(ellipse 45% 45% at 85% 15%, rgba(143, 80, 0, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 52px;
  align-items: center;
}

/* Eyebrow label */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.eyebrow::before {
  content: "";
  width: 20px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

/* Hero Title */
.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(30px, 4.2vw, 46px);
  line-height: 1.15;
  margin: 14px 0 20px;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text);
}

/* Gradient text effect */
.grad {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  background-size: 200% 200%;
  animation: gradientShift 8s ease infinite;
}
@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero .lead {
  font-size: 17px;
  color: var(--text-soft);
  max-width: 520px;
  margin: 0;
  line-height: 1.7;
}

/* Stats row */
.stats {
  display: flex;
  gap: 32px;
  margin: 28px 0 22px;
}
.stat b {
  font-size: 28px;
  display: block;
  line-height: 1.1;
  font-weight: 800;
  color: var(--text);
  font-family: var(--font-serif);
}
.stat span {
  color: var(--text-mute);
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

/* CTA Buttons */
.cta {
  display: flex;
  gap: 12px;
  margin: 6px 0 20px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14.5px;
  border: none;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #fff !important;
  box-shadow: 0 4px 16px var(--accent-glow), 0 1px 3px rgba(0,0,0,0.08);
}
.btn-primary:hover {
  transform: translateY(-2.5px) scale(1.02);
  box-shadow: 0 8px 28px var(--accent-glow), 0 4px 12px rgba(178, 58, 38, 0.15);
  filter: brightness(1.06);
  text-decoration: none;
}
.btn-primary:active { transform: translateY(0) scale(0.98); }

.btn-outline {
  background: transparent;
  color: var(--text) !important;
  border: 1.5px solid var(--border-strong);
  box-shadow: none;
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent) !important;
  background: var(--accent-soft);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--accent-soft);
}

/* Social links in hero */
.hero .socials {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.socials a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1.5px solid var(--border);
  border-radius: 999px;
  color: var(--text-soft);
  font-size: 13.5px;
  background: var(--bg-soft);
  transition: all var(--duration-normal) var(--ease-out-expo);
  font-weight: 500;
}
.socials a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 4px 14px var(--accent-glow);
}

/* ============================================
   HERO CARD — 右侧个人信息卡片
   ============================================ */
.hero-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  box-shadow: var(--shadow-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: transform var(--duration-normal) var(--ease-out-expo),
              box-shadow var(--duration-normal) ease;
}
.hero-card:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 20px 56px rgba(44, 40, 37, 0.12), 0 8px 20px rgba(44, 40, 37, 0.06);
}

/* Card top accent bar */
.hero-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3));
}

.avatar-lg {
  width: 110px;
  height: 110px;
  border-radius: 28px;
  border: 3px solid var(--border);
  margin: 0 auto 18px;
  display: block;
  transition: transform var(--duration-normal) var(--ease-out-back);
  box-shadow: var(--shadow-md);
}
.hero-card:hover .avatar-lg {
  transform: scale(1.05) rotate(-2deg);
}

.hc-name {
  font-weight: 800;
  font-size: 20px;
  font-family: var(--font-serif);
  color: var(--text);
  margin-bottom: 4px;
}
.hc-role {
  color: var(--text-mute);
  font-size: 14px;
  margin-bottom: 18px;
  font-weight: 500;
}
.hc-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

/* ============================================
   SECTIONS — 通用区块
   ============================================ */
.section {
  margin-top: 60px;
}
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 22px;
  gap: 16px;
}
.section-head h2 {
  font-family: var(--font-serif);
  font-size: 24px;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.01em;
}
.section .sub {
  color: var(--text-mute);
  font-size: 14px;
  margin: 0 0 20px;
}
.section .more {
  font-size: 14px;
  color: var(--text-mute);
  white-space: nowrap;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: color var(--duration-fast) ease;
}
.section .more:hover {
  color: var(--accent);
  text-decoration: none;
}

/* ============================================
   CARDS — 卡片组件
   ============================================ */
.grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: all var(--duration-normal) var(--ease-out-expo);
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2.5px;
  background: linear-gradient(90deg, var(--accent), var(--accent-3));
  opacity: 0;
  transition: opacity var(--duration-normal) ease;
}
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-md);
  box-shadow: inset 0 0 0 1px transparent;
  transition: box-shadow var(--duration-normal) ease;
  pointer-events: none;
}
.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg), 0 0 0 1px var(--accent-soft);
  border-color: transparent;
  text-decoration: none;
}
.card:hover::before { opacity: 1; }
.card:hover::after { box-shadow: inset 0 0 0 1px rgba(178, 58, 38, 0.08); }

.card h3 {
  margin: 0;
  font-size: 17.5px;
  color: var(--text);
  line-height: 1.4;
  font-weight: 700;
  transition: color var(--duration-fast) ease;
}
.card:hover h3 { color: var(--accent); }

.card .desc {
  color: var(--text-soft);
  font-size: 14px;
  margin: 0;
  flex: 1;
  line-height: 1.6;
}
.card .meta {
  color: var(--text-mute);
  font-size: 13px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}
.cat-card { gap: 14px; }
.cat-card .badge-cat { align-self: flex-start; }

/* ============================================
   TAGS & BADGES — 标签与徽章
   ============================================ */
.tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  padding: 3px 11px;
  border-radius: 999px;
  background: var(--bg-hover);
  color: var(--text-soft);  /* WCAG: #5c5650 on #f5f2ed ≈ 4.9:1 ✓ */
  border: 1px solid var(--border);
  transition: all var(--duration-fast) ease;
}
.tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
  text-decoration: none;
}

.badge-cat {
  display: inline-block;
  font-size: 11.5px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.badge-debug { background: var(--cat-debug-bg); color: var(--cat-debug-text); }
.badge-learn { background: var(--cat-learn-bg); color: var(--cat-learn-text); }
.badge-insight { background: var(--cat-insight-bg); color: var(--cat-insight-text); }

/* ============================================
   SPOTLIGHT — 主打项目展示
   ============================================ */
.spotlight {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  transition: all var(--duration-normal) var(--ease-out-expo);
}
.spotlight:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
  border-color: var(--border-strong);
}
.spotlight-body {
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.spotlight-body h3 {
  margin: 6px 0 0;
  font-size: 23px;
  font-weight: 800;
  font-family: var(--font-serif);
  color: var(--text);
}
.spotlight-body p {
  color: var(--text-soft);
  margin: 0;
  line-height: 1.65;
  font-size: 15px;
}
.spotlight-body .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.sl-link {
  margin-top: 6px;
  color: var(--accent);
  font-weight: 700;
  font-size: 14.5px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--duration-fast) ease;
}
.spotlight:hover .sl-link { gap: 8px; }

.spotlight-art {
  background: linear-gradient(145deg, var(--accent-soft) 0%, rgba(143, 80, 0, 0.06) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  min-height: 220px;
}
.spotlight-art::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 40%, rgba(178, 58, 38, 0.10) 0%, transparent 50%),
    radial-gradient(circle at 70% 70%, rgba(143, 80, 0, 0.08) 0%, transparent 50%);
}
.spotlight-art .robot {
  font-size: 88px;
  filter: drop-shadow(0 12px 24px rgba(0, 0, 0, 0.12));
  animation: robotFloat 4s ease-in-out infinite;
  position: relative;
  z-index: 1;
}
@keyframes robotFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ============================================
   AWARDS WALL — 荣誉墙
   ============================================ */
.awards-strip {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
}
.award-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-left: 3.5px solid var(--accent-2);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  box-shadow: var(--shadow);
  transition: all var(--duration-normal) var(--ease-out-expo);
}
.award-card:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
  border-left-color: var(--accent);
}
.ac-date {
  color: var(--text-mute);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.ac-name {
  font-weight: 700;
  margin: 4px 0 2px;
  font-size: 15px;
}
.ac-lvl {
  color: var(--accent-2);
  font-size: 13px;
  font-weight: 600;
}

/* ============================================
   TIMELINE — 时间线 (About 页)
   ============================================ */
.timeline {
  border-left: 2px solid var(--border-strong);
  margin-left: 10px;
  padding-left: 28px;
  display: flex;
  flex-direction: column;
  gap: 22px;
  position: relative;
}
.tl-item {
  position: relative;
}
.tl-item::before {
  content: "";
  position: absolute;
  left: -33px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-elev);
  border: 2.5px solid var(--accent);
  transition: all var(--duration-fast) ease;
}
.tl-item:hover::before {
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
  transform: scale(1.2);
}
.tl-item .date {
  color: var(--text-mute);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 2px;
}
.tl-item .name {
  font-weight: 700;
  font-size: 15.5px;
}
.tl-item .lvl {
  color: var(--accent-2);
  font-size: 13px;
  font-weight: 600;
  margin-left: 8px;
}

/* ============================================
   PROSE — 文章正文排版
   ============================================ */
.prose {
  font-size: 16.5px;
  color: var(--text);
  line-height: 1.8;
}
.prose h2 {
  font-family: var(--font-serif);
  font-size: 24px;
  margin: 40px 0 14px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}
.prose h2:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 28px;
}
.prose h3 {
  font-size: 19.5px;
  margin: 30px 0 10px;
  font-weight: 700;
  color: var(--text);
}
.prose p { margin: 16px 0; }
.prose ul, .prose ol { padding-left: 24px; margin: 14px 0; }
.prose li { margin: 6px 0; line-height: 1.75; }
.prose li::marker { color: var(--accent); }

.prose blockquote {
  margin: 22px 0;
  padding: 16px 20px;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-soft);
  font-style: italic;
  position: relative;
}
.prose blockquote p { margin: 0; }

.prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-hover);
  padding: 2px 7px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border);
  color: var(--accent);
  font-weight: 500;
}
.prose pre {
  background: var(--bg-code) !important;
  color: #e6edf3;
  padding: 20px 22px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.65;
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow: var(--shadow-sm);
  margin: 20px 0;
  position: relative;
}
/* Code block decoration */
.prose pre::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 12px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ff5f57;
  box-shadow: 16px 0 0 #febc2e, 32px 0 0 #28c840;
  opacity: 0.6;
}
.prose pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
  display: block;
  padding-top: 8px;
}
.prose img {
  display: block;
  margin: 24px auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
}
.prose hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 32px 0;
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 15px;
}
.prose th, .prose td {
  padding: 10px 14px;
  border: 1px solid var(--border);
  text-align: left;
}
.prose th {
  background: var(--bg-hover);
  font-weight: 700;
  color: var(--text);
}

/* System architecture: semantic flow, compact on small screens. */
.prose .architecture {
  margin: 24px 0;
  max-width: 100%;
}
.prose .architecture-flow,
.prose .architecture-items,
.prose .architecture-modules {
  list-style: none;
  margin: 0;
  padding: 0;
}
.prose .architecture-flow {
  display: grid;
  gap: 26px;
}
.prose .architecture-flow__step {
  min-width: 0;
  position: relative;
}
.architecture-flow__connector {
  background: var(--accent);
  height: 14px;
  left: 50%;
  position: absolute;
  top: -20px;
  transform: translateX(-50%);
  width: 2px;
}
.architecture-flow__connector::after {
  border: solid var(--accent);
  border-width: 0 2px 2px 0;
  content: "";
  height: 6px;
  left: -3px;
  position: absolute;
  top: 7px;
  transform: rotate(45deg);
  width: 6px;
}
.prose .architecture-layer,
.prose .architecture-module {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  min-width: 0;
  overflow-wrap: anywhere;
}
.prose .architecture-layer {
  padding: 18px;
}
.prose .architecture-layer--modules {
  background: var(--bg-hover);
}
.prose .architecture-layer__title,
.prose .architecture-module__title {
  color: var(--text);
  margin: 0;
  overflow-wrap: anywhere;
}
.prose .architecture-layer__title {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.35;
}
.prose .architecture-items {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.prose .architecture-items li {
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  color: var(--text-soft);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.45;
  margin: 0;
  padding: 6px 9px;
}
.prose .architecture-modules {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 14px;
}
.prose .architecture-module {
  padding: 14px;
}
.prose .architecture-module__title {
  font-size: 15px;
  font-weight: 800;
  line-height: 1.4;
}
.prose .architecture-module .architecture-items {
  gap: 6px;
  margin-top: 10px;
}
.prose .architecture-module .architecture-items li {
  font-size: 13px;
  padding: 5px 7px;
}
/* Post header area */
.post-head { margin: 32px 0 16px; }
.post-head h1 {
  font-family: var(--font-serif);
  font-size: clamp(26px, 4vw, 34px);
  margin: 0 0 12px;
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
}
.post-meta {
  color: var(--text-mute);
  font-size: 14px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

/* ============================================
   SHARE & COMMENT — 分享与评论
   ============================================ */
.share {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 28px 0;
}
.share button, .share a {
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text-soft);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  font-weight: 500;
  display: inline-flex;
  gap: 6px;
  align-items: center;
  transition: all var(--duration-fast) ease;
}
.share button:hover, .share a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
  text-decoration: none;
  transform: translateY(-1px);
}

/* Pager (prev/next post) */
.pager {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin: 36px 0;
}
.pager a {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  color: var(--text);
  transition: all var(--duration-normal) ease;
  display: block;
}
.pager a:hover {
  border-color: var(--accent);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  background: var(--bg-soft);
}
.pager .label {
  color: var(--text-mute);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
  margin-bottom: 4px;
}
.pager .ttl {
  font-weight: 700;
  font-size: 15px;
}

/* Skills section */
.skill-group { margin-bottom: 16px; }
.skill-group .g {
  font-weight: 600;
  color: var(--text-soft);
  font-size: 13.5px;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.skill-tags span {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 5px 13px;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text);
  transition: all var(--duration-fast) ease;
}
.skill-tags span:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* Notice / alert box */
.notice {
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent-glow);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 14px;
  margin: 28px 0;
  line-height: 1.6;
}
.notice code {
  background: var(--bg-soft);
  padding: 2px 7px;
  border-radius: var(--radius-xs);
  font-size: 0.9em;
}

/* About page avatar */
.avatar {
  width: 96px;
  height: 96px;
  border-radius: 24px;
  border: 3px solid var(--border);
  box-shadow: var(--shadow-md);
}
.row {
  display: flex;
  gap: 28px;
  align-items: flex-start;
}
.row > div { flex: 1; }

/* Filter buttons on blog index */
#filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
#filters button {
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text-soft);
  min-height: 44px;
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 500;
  transition: all var(--duration-fast) ease;
}
#filters button:hover {
  border-color: var(--accent);
  color: var(--accent);
}
#filters button.active {
  background: var(--accent);
  color: #fff !important;
  border-color: var(--accent);
}

/* ============================================
   ANIMATIONS — 入场动画
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeInUp 0.6s var(--ease-out-expo) both;
}
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

/* Scroll-triggered reveal (via IntersectionObserver in JS) */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease-out-expo),
              transform 0.7s var(--ease-out-expo);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   RESPONSIVE — 响应式适配
   ============================================ */

/* Tablet */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-card { max-width: 380px; margin: 0 auto; }
  .spotlight { grid-template-columns: 1fr; }
  .spotlight-art { min-height: 180px; order: -1; }
  .stats { gap: 24px; }
  .brand { max-width: 200px; }
}

/* Mobile */
@media (max-width: 760px) {
  :root { --maxw: 100%; }

  .container { padding: 0 18px; }

  .hero { padding: 52px 0 40px; }
  .hero-grid { gap: 32px; }

  .section { margin-top: 44px; }
  .section-head h2 { font-size: 21px; }

  .grid { grid-template-columns: 1fr; gap: 14px; }
  .card { padding: 20px; border-radius: var(--radius-sm); }

  .spotlight-body { padding: 22px; }
  .spotlight-body h3 { font-size: 20px; }

  .awards-strip { grid-template-columns: 1fr; }

  .post-head h1 { font-size: 24px; }
  .prose { font-size: 16px; line-height: 1.8; }
  .prose h2 { font-size: 21px; }
  .prose h3 { font-size: 17.5px; }

  .prose .architecture { margin: 20px 0; }
  .prose .architecture-flow { gap: 22px; }
  .architecture-flow__connector { top: -17px; height: 12px; }
  .architecture-flow__connector::after { top: 5px; }
  .prose .architecture-layer { padding: 16px; }
  .prose .architecture-layer__title { font-size: 17.5px; }
  .prose .architecture-items { gap: 7px; margin-top: 12px; }
  .prose .architecture-items li { font-size: 13.5px; padding: 6px 8px; }
  .prose .architecture-modules { grid-template-columns: 1fr; gap: 9px; margin-top: 12px; }
  .prose .architecture-module { padding: 14px; }
  .pager { flex-direction: column; }

  .row { flex-direction: column; align-items: center; text-align: center; }
  .row > div { text-align: center; }
  .socials { justify-content: center; }

  .stats { justify-content: flex-start; }
  .stat b { font-size: 24px; }

  .site-footer .inner { flex-direction: column; text-align: center; gap: 8px; padding: 32px 20px; }

  /* Brand: allow more space on mobile */
  .brand {
    font-size: 13px;
    gap: 8px;
  }
  .brand img {
    width: 26px;
    height: 26px;
  }
}

/* Prefers reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .theme-toggle:hover,
  .theme-toggle:active {
    transform: none;
  }
}

/* ============================================
   SCROLLBAR — 自定义滚动条
   ============================================ */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 4px;
  transition: background var(--duration-fast) ease;
}
::-webkit-scrollbar-thumb:hover { background: var(--text-mute); }

/* Focus styles for accessibility */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

button:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ============================================
   ACCESSIBILITY — 可访问性增强
   ============================================ */

/* Skip link:跳到正文 */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 9999;
  padding: 8px 16px;
  background: var(--text);
  color: var(--bg);
  border-radius: var(--radius-xs);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: top 0.15s ease;
}
.skip-link:focus {
  top: 8px;
}

/* Screen reader only text */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}


/* Table scroll container for mobile */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 20px 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.table-scroll table {
  margin: 0;
  border: none;
}
.table-scroll:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* CTA button - 暖色调覆盖 */
.btn-primary {
  background: linear-gradient(135deg, #b23a26 0%, #8f5000 100%) !important;
  color: #fff !important;
}
html.dark .btn-primary {
  background: linear-gradient(135deg, #f07156 0%, #f0a84a 100%) !important;
  color: var(--text-inverse) !important;
}

/* ============================================
   RESPONSIVE FIXES — 响应式修复
   ============================================ */

/* Collapse six primary navigation items before they crowd the header. */
@media (max-width: 768px) {
  .nav {
    display: none;
    position: absolute;
    top: 63px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-soft);
    padding: 12px 16px 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    z-index: 50;
    gap: 2px;
  }
  html.dark .nav {
    background: var(--bg-elev);
  }
  .nav.open {
    display: flex;
    animation: slideDown 0.25s var(--ease-out-expo);
  }
  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
  }
  .nav.open a {
    display: inline-flex;
    align-items: center;
    min-width: 44px;
    min-height: 44px;
    padding: 13px 16px;
    border-radius: var(--radius-xs);
    font-size: 15px;
  }

  /* Hamburger button */
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  /* Ensure touch targets are at least 44x44px */
  .theme-toggle,
  .nav-toggle {
    width: 44px !important;
    height: 44px !important;
    min-width: 44px !important;
  }
  .theme-toggle svg,
  .nav-toggle svg {
    width: 22px;
    height: 22px;
  }

  /* Brand fix for 500-568px */
  .brand {
    min-width: 80px;
  }
  .brand span {
    font-size: 12px;
  }

  .btn { padding: 11px 22px; font-size: 14px; }
  .cta { flex-direction: column; gap: 10px; }
  .cta .btn { justify-content: center; width: 100%; }

  .stat b { font-size: 22px; }
  .stats { gap: 20px; }

  .hero-card { padding: 24px 20px; border-radius: var(--radius-lg); }
  .avatar-lg { width: 90px; height: 90px; border-radius: 22px; }

  .card { padding: 18px 16px; min-height: 56px; }
  .card h3 { font-size: 16.5px; }
  .card h2 { font-size: 17px; }
  .card .desc { font-size: 13.5px; -webkit-line-clamp: 3; display: -webkit-box; -webkit-box-orient: vertical; overflow: hidden; }

  /* Filter buttons on mobile */
  #filters {
    flex-wrap: wrap;
    gap: 6px;
  }
  #filters button {
    padding: 9px 16px;
    font-size: 13px;
  }
}

/* Prevent horizontal scroll on small screens */
@media (max-width: 320px) {
  body {
    overflow-x: hidden;
  }
  .container {
    padding: 0 14px;
  }
  .hero { padding: 36px 0 28px; }
  .hero h1 { font-size: 24px; }
  .hero .lead { font-size: 14px; }
}

/* Ensure code blocks and tables don't cause full-page scroll */
.prose pre,
.table-scroll {
  max-width: 100%;
  overflow-x: auto;
}

/* ============================================
   TERMS PAGE — 专业术语页面
   ============================================ */

.terms-page {
  max-width: var(--maxw);
  margin: 28px auto 0;
}

.terms-title {
  margin: 0 0 4px;
  font-size: 26px;
}

.terms-intro {
  margin: 0 0 20px;
  color: var(--text-mute);
}

.terms-search-wrap {
  margin-bottom: 16px;
}

.terms-search-hint {
  margin: -2px 0 8px;
  color: var(--text-mute);
  font-size: 13px;
  line-height: 1.55;
}

.terms-search-label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-soft);
  font-size: 14px;
  font-weight: 600;
}

.terms-search {
  width: 100%;
  min-height: 44px;
  padding: 10px 16px;
  font-size: 15px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  color: var(--text);
  font-family: var(--font-sans);
  transition: border-color var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
}

.terms-search:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.terms-search::placeholder {
  color: var(--text-mute);
}

.terms-cats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.terms-cats button {
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text-soft);
  min-height: 44px;
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 500;
  transition: all var(--duration-fast) ease;
}

.terms-cats button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.terms-cats button.active {
  background: var(--accent);
  color: #fff !important;
  border-color: var(--accent);
}

.terms-count {
  font-size: 13px;
  color: var(--text-mute);
  margin-bottom: 14px;
  padding: 4px 0;
}

/* Terms pagination: independent from article pager */
.terms-pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: min(100%, 720px);
  max-width: 100%;
  margin: 24px auto 0;
}

.terms-page-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  max-width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  color: var(--text-soft);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  overflow-wrap: anywhere;
  touch-action: manipulation;
  transition: background-color var(--duration-fast) ease,
              border-color var(--duration-fast) ease,
              color var(--duration-fast) ease,
              box-shadow var(--duration-fast) ease;
}

.terms-page-btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--bg-hover);
  color: var(--accent);
}

.terms-page-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.terms-page-btn[aria-current="page"] {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--text-inverse);
  box-shadow: var(--shadow-sm);
}

.terms-page-btn[aria-current="page"]:hover:not(:disabled) {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: var(--text-inverse);
}

.terms-page-btn:disabled:not([aria-current="page"]) {
  cursor: not-allowed;
  border-color: var(--border);
  background: var(--bg-hover);
  color: var(--text-mute);
  box-shadow: none;
  opacity: 0.58;
}

.terms-page-btn[aria-current="page"]:disabled {
  cursor: default;
  opacity: 1;
}

.terms-page-ellipsis {
  display: inline-grid;
  place-items: center;
  min-width: 24px;
  min-height: 44px;
  color: var(--text-mute);
  font-weight: 700;
  line-height: 1;
  user-select: none;
}

.terms-page-jump {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  max-width: 100%;
}

.terms-page-jump-label,
.terms-page-jump-suffix {
  flex: 0 0 auto;
  color: var(--text-mute);
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
}

.terms-page-jump-input {
  box-sizing: border-box;
  width: 56px;
  min-width: 52px;
  min-height: 44px;
  padding: 7px 8px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  color: var(--text);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  text-align: center;
  touch-action: manipulation;
  transition: background-color var(--duration-fast) ease,
              border-color var(--duration-fast) ease,
              box-shadow var(--duration-fast) ease;
}

.terms-page-jump-input::placeholder {
  color: var(--text-mute);
  opacity: 1;
}

.terms-page-jump-input:hover {
  border-color: var(--accent);
}

.terms-page-jump-input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.terms-page-jump-input[aria-invalid="true"] {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.terms-page-jump-submit {
  min-width: 56px;
  padding-inline: 10px;
}

.terms-empty {
  padding: 40px 20px;
  color: var(--text-mute);
  text-align: center;
}

.terms-empty .btn {
  display: inline-flex;
  min-height: 44px;
  margin-top: 12px;
}

.terms-results,
.terms-search-section {
  min-width: 0;
}

.terms-search-section {
  margin-top: 24px;
}

.terms-search-section + .terms-search-section {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

.terms-search-section-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 12px;
  margin-bottom: 14px;
}

.terms-search-section-title {
  margin: 0;
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 1.3;
}

.terms-search-section-copy {
  margin: 0;
  color: var(--text-mute);
  font-size: 13px;
  line-height: 1.55;
}

.terms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 16px;
  scroll-margin-top: var(--scroll-offset, 73px);
}

.term-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
  scroll-margin-top: var(--scroll-offset, 73px);
}

.term-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.term-header {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
}

.term-name {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin: 0;
  overflow-wrap: anywhere;
}

.term-aliases {
  font-size: 13px;
  color: var(--text-mute);
}

.term-fullname {
  font-size: 13px;
  color: var(--accent-2);
  font-style: italic;
  overflow-wrap: anywhere;
}

.term-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.term-cat {
  align-self: flex-start;
}

.term-summary {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--text-soft);
  margin: 0;
  overflow-wrap: anywhere;
}

.term-details {
  margin-top: 4px;
}

.term-details summary {
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--accent);
  list-style: none;
  outline: none;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 4px 0;
}

.term-details summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.term-details summary::-webkit-details-marker {
  display: none;
}

.term-details summary::before {
  content: '▶';
  margin-right: 6px;
  font-size: 11px;
  transition: transform var(--duration-fast) ease;
  display: inline-block;
}

.term-details[open] summary::before {
  transform: rotate(90deg);
}

.term-details ul {
  margin: 8px 0 0 18px;
  padding: 0;
  list-style-position: outside;
}

.term-details li {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-soft);
  margin: 4px 0;
}

.term-related,
.term-refs {
  font-size: 13px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  overflow-wrap: anywhere;
}

.term-label {
  font-weight: 600;
  color: var(--text-mute);
  flex-shrink: 0;
}

.term-link {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.term-link:hover {
  color: var(--accent-hover);
}

.term-refs a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.term-refs a:hover {
  color: var(--accent-hover);
}

/* Responsive: terms page */
@media (max-width: 760px) {
  .terms-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .term-card {
    padding: 16px 18px;
  }

  .term-name {
    font-size: 17px;
  }

  .terms-cats {
    gap: 6px;
  }

  .terms-cats button {
    padding: 9px 14px;
    font-size: 13px;
  }

  .terms-search-section {
    margin-top: 20px;
  }

  .terms-search-section + .terms-search-section {
    margin-top: 24px;
    padding-top: 20px;
  }

  .terms-search-section-head {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 12px;
  }
}

@media (max-width: 400px) {
  .term-header {
    flex-direction: column;
    gap: 4px;
  }

  .terms-pagination {
    gap: 6px;
  }

  .terms-page-jump {
    gap: 4px;
  }

  .terms-page-jump-input {
    width: 52px;
    min-width: 48px;
  }

  .terms-page-jump-submit {
    min-width: 52px;
    padding-inline: 8px;
  }
}

/* ============================================
   TERM HASH TARGET — 锚点目标闪烁提醒
   ============================================ */

.term-card--hash-target {
  outline: 2px solid var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft), 0 8px 24px var(--accent-glow);
}

@keyframes termHashPulse {
  0%, 32%, 100% {
    outline-color: transparent;
    box-shadow: none;
  }
  14%, 64% {
    outline-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-soft), 0 8px 24px var(--accent-glow);
  }
}

.term-card--hash-target.animate-pulse {
  animation: termHashPulse 1.2s ease-in-out 1;
}

/* Reduced motion: 静态高亮替代动画 */
@media (prefers-reduced-motion: reduce) {
  .term-card--hash-target.animate-pulse {
    animation: none;
    outline-width: 3px;
    outline-offset: 2px;
  }
}