/* ===== 全局变量 ===== */
:root {
  --primary: #0a192f;
  --primary-light: #112240;
  --secondary: #1d3557;
  --accent: #e6a117;
  --accent-light: #f0c040;
  --text: #ccd6f6;
  --text-light: #8892b0;
  --white: #e6f1ff;
  --card-bg: rgba(17, 34, 64, 0.7);
  --border: rgba(230, 161, 23, 0.15);
  --gradient-start: #0a192f;
  --gradient-end: #1a1a3e;
  --success: #64ffda;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* ========== 语义化布局变量 ========== */
  --bg-primary: #0a192f;
  --bg-secondary: #112240;
  --bg-tertiary: #1a2f4a;
  --text-primary: #e6f1ff;
  --text-secondary: #8892b0;
  --text-tertiary: #8892b0;
  --article-bg: #0a192f;

  /* ========== 间距系统 ========== */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  /* ========== 阴影系统 ========== */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

  /* ========== 圆角系统 ========== */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-card: 12px;
  --radius-tag: 4px;
  --radius-btn: 10px;
  --radius-xl: 16px;
  --radius-icon: 14px;
  --radius-pill: 50px;

  /* ========== 过渡系统 ========== */
  /* 语义化曲线（统一全站动效节奏） */
  --ease-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  /* 语义化时长 */
  --dur-fast: 0.18s;
  --dur: 0.3s;
  --dur-slow: 0.5s;
  /* 组合令牌（优先使用上面的语义令牌） */
  --transition-fast: var(--dur-fast) var(--ease-out);
  --transition-normal: var(--dur) var(--ease-out);

  /* ========== 字号层级 ========== */
  --font-size-h1: 2rem;
  --font-size-h2: 1.5rem;
  --font-size-h3: 1.25rem;
  --font-size-h4: 1.125rem;
  --font-size-body: 1rem;
  --font-size-body-lg: 1.0625rem;
  --font-size-small: 0.875rem;
  --font-size-md: 1rem;
  --font-weight-medium: 500;
  --font-size-tag: 0.75rem;

  /* ========== 字体族 ========== */
  --font-family-sans: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-serif: "Times New Roman", "Georgia", "STSong", "SimSun", "Songti SC", "Noto Serif SC", serif;
  /* 正文专用：无衬线黑体（思源黑体已由 Google Fonts 加载，SIL OFL 无版权风险） */
  --font-family-body: "Noto Sans SC", "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  /* 等宽代码字体 */
  --font-family-mono: "JetBrains Mono", "Fira Code", "SF Mono", "Consolas", "Courier New", monospace;

  /* ========== 导航系统 ========== */
  --header-height: 70px;
  --navbar-bg: rgba(10, 25, 47, 0.85);
  --navbar-bg-scrolled: rgba(10, 25, 47, 0.95);
  --navbar-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
  --mobile-nav-bg: rgba(10, 25, 47, 0.98);

  /* ========== 强调色半透明系统 ========== */
  --accent-10: rgba(230, 161, 23, 0.1);
  --accent-15: rgba(230, 161, 23, 0.15);
  --accent-20: rgba(230, 161, 23, 0.2);
  --accent-30: rgba(230, 161, 23, 0.3);
  --accent-40: rgba(230, 161, 23, 0.4);
  --accent-50: rgba(230, 161, 23, 0.5);
  --accent-60: rgba(230, 161, 23, 0.6);
  --accent-05: rgba(230, 161, 23, 0.05);
  --accent-08: rgba(230, 161, 23, 0.08);
  --accent-gradient-start: rgba(230, 161, 23, 0.15);
  --accent-gradient-end: rgba(230, 161, 23, 0.05);
  --accent-shadow-hover: 0 8px 25px rgba(230, 161, 23, 0.4);

  /* ========== 功能色 ========== */
  --success-bg: rgba(100, 255, 218, 0.1);
  --text-light-bg: rgba(136, 146, 176, 0.15);
  --border-color: var(--border);
  --bg-hover: var(--bg-secondary);

  /* ========== 品牌色 ========== */
  --brand-feishu: #3370ff;
  --brand-feishu-light: #60a5fa;
  --brand-chatglm: #6366f1;
  --brand-chatglm-light: #a78bfa;
  --brand-metaso: #10b981;
  --brand-metaso-light: #34d399;

  /* ========== 遮罩层 ========== */
  --overlay-light: rgba(10, 25, 47, 0.7);
  --overlay-dark: rgba(0, 0, 0, 0.92);
  --overlay-badge-bg: rgba(0, 0, 0, 0.6);
  --overlay-hover-gradient: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  --overlay-hover-text: rgba(255, 255, 255, 0.95);
  --text-on-accent: #ffffff;
}

/* ===== 浅色主题 ===== */
[data-theme="light"] {
  /* 旧变量覆盖（与 Story 1.1b 保持一致） */
  --primary: #ffffff;
  --primary-light: #f8fafc;
  --secondary: #e2e8f0;
  --accent: #b8860b;
  --accent-light: #92400e;  /* Task 3: 从 #d4a017 (2.7:1) 修复为 #92400e (~7.1:1) */
  --text: #1a202c;
  --text-light: #374151;
  --white: #111827;
  --card-bg: rgba(255, 255, 255, 0.8);
  --border: rgba(0, 0, 0, 0.1);
  --gradient-start: #f8fafc;
  --gradient-end: #e2e8f0;
  --success: #059669;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);

  /* 语义化变量覆盖 */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-primary: #111827;
  --text-secondary: #374151;
  --text-tertiary: #6b7280;
  --article-bg: #ffffff;

  /* 导航系统覆盖 */
  --navbar-bg: rgba(255, 255, 255, 0.85);
  --navbar-bg-scrolled: rgba(255, 255, 255, 0.95);
  --navbar-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
  --mobile-nav-bg: rgba(255, 255, 255, 0.98);

  /* 强调色半透明覆盖 — 基于 #b8860b = rgb(184,134,11) */
  --accent-10: rgba(184, 134, 11, 0.1);
  --accent-15: rgba(184, 134, 11, 0.15);
  --accent-20: rgba(184, 134, 11, 0.2);
  --accent-30: rgba(184, 134, 11, 0.3);
  --accent-40: rgba(184, 134, 11, 0.4);
  --accent-50: rgba(184, 134, 11, 0.5);
  --accent-60: rgba(184, 134, 11, 0.6);
  --accent-05: rgba(184, 134, 11, 0.05);
  --accent-08: rgba(184, 134, 11, 0.08);
  --accent-gradient-start: rgba(184, 134, 11, 0.15);
  --accent-gradient-end: rgba(184, 134, 11, 0.05);
  --accent-shadow-hover: 0 8px 25px rgba(184, 134, 11, 0.25);

  /* 功能色覆盖 */
  --success-bg: rgba(5, 150, 105, 0.1);
  --text-light-bg: rgba(55, 65, 81, 0.1);

  /* 遮罩层覆盖 */
  --overlay-light: rgba(248, 250, 252, 0.85);
  --overlay-dark: rgba(0, 0, 0, 0.85);
  --overlay-badge-bg: rgba(0, 0, 0, 0.5);
  --overlay-hover-gradient: linear-gradient(to top, rgba(0, 0, 0, 0.5), transparent);
  --overlay-hover-text: rgba(255, 255, 255, 0.9);
  --text-on-accent: #ffffff;

  /* 阴影系统覆盖 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

  --bg-primary-gradient: linear-gradient(135deg, #ffffff 0%, #f8fafc 50%, #f0f4f8 100%);

  /* 品牌色（主题无关，保持一致） */
  --brand-feishu: #3370ff;
  --brand-feishu-light: #60a5fa;
  --brand-chatglm: #6366f1;
  --brand-chatglm-light: #a78bfa;
  --brand-metaso: #10b981;
  --brand-metaso-light: #34d399;
}

/* ===== 浅色主题增强规则 ===== */
body[data-theme="light"] {
  background: var(--bg-primary-gradient);
}

[data-theme="light"] .tool-card:hover,
[data-theme="light"] .blog-card:hover {
  border-left: 3px solid var(--accent);
}

[data-theme="light"] .paper-quartile.q1 {
  color: var(--accent-light);
}

[data-theme="light"] .paper-badge.top {
  color: #047857;
  border-color: #047857;
}

[data-theme="light"] .navbar.scrolled {
  border-bottom: 2px solid var(--accent-20);
}

/* ========== 响应式断点 ========== */
/* Desktop: ≥ 1024px */
/* Tablet: 768px - 1023px */
/* Mobile: < 768px */
/* Sub-breakpoint: ≤ 480px (小屏手机) */

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

html {
  scroll-behavior: smooth;
  font-size: 20px;
  scrollbar-gutter: stable;
}

body {
  font-family: var(--font-family-sans);
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: var(--text);
  min-height: 100vh;
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--accent-light);
}

img {
  max-width: 100%;
  height: auto;
}

/* ===== 动态背景光晕 ===== */
.bg-effects {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
}

.bg-orb--1 {
  width: 45vmax;
  height: 45vmax;
  background: var(--accent-60);
  top: -12%;
  right: -8%;
  animation: orbFloat1 20s ease-in-out infinite;
}

.bg-orb--2 {
  width: 35vmax;
  height: 35vmax;
  background: var(--accent-50);
  bottom: -12%;
  left: -8%;
  animation: orbFloat2 25s ease-in-out infinite;
}

.bg-orb--3 {
  width: 25vmax;
  height: 25vmax;
  background: var(--accent-40);
  top: 35%;
  left: 25%;
  animation: orbFloat3 18s ease-in-out infinite;
}

[data-theme="light"] .bg-orb--1 {
  background: var(--accent-30);
}
[data-theme="light"] .bg-orb--2 {
  background: var(--accent-20);
}
[data-theme="light"] .bg-orb--3 {
  background: var(--accent-15);
}

@keyframes orbFloat1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(-80px, 60px) scale(1.1); }
  66% { transform: translate(40px, -40px) scale(0.95); }
}

@keyframes orbFloat2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(60px, -80px) scale(1.05); }
  66% { transform: translate(-30px, 50px) scale(0.9); }
}

@keyframes orbFloat3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-60px, -60px) scale(1.15); }
}

@media (prefers-reduced-motion: reduce) {
  .bg-orb { animation: none; }
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 2rem;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 1rem;
  color: var(--text);
  background: var(--navbar-bg);
  -webkit-backdrop-filter: blur(12px) saturate(1.3);
  backdrop-filter: blur(12px) saturate(1.3);
  border-bottom: 1px solid transparent;
  transition: background var(--dur) var(--ease-out),
              box-shadow var(--dur) var(--ease-out),
              border-color var(--dur) var(--ease-out),
              height var(--dur) var(--ease-out);
}

/* 滚动后：加深背景 + 阴影 + 收窄高度（main.js:initScrollNavbar 在 scrollY>50 加 .scrolled） */
.navbar.scrolled {
  height: 60px;
  background: var(--navbar-bg-scrolled);
  box-shadow: var(--navbar-shadow);
  border-bottom-color: var(--border);
}

/* ===== Logo ===== */
.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease-out);
}
.nav-logo:hover {
  color: var(--accent);
}
.nav-logo:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}
.logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-icon);
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: var(--primary);
  font-size: 1.1rem;
  box-shadow: 0 4px 12px var(--accent-30);
  transition: transform var(--dur) var(--ease-spring);
}
.nav-logo:hover .logo-icon {
  transform: rotate(-12deg) scale(1.06);
}

.nav-links {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 0.25rem;
}

.nav-links a {
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
  position: relative;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-10);
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

/* ===== 主题切换按钮 ===== */
#themeToggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  margin-left: 0.5rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--accent-05);
  color: var(--accent);
  font-size: 1.05rem;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              transform var(--dur) var(--ease-spring);
}
#themeToggle:hover {
  background: var(--accent-15);
  border-color: var(--accent-40);
  transform: scale(1.08);
}
#themeToggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  cursor: pointer;
  padding: 0 7px;
  background: transparent;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease-out),
              opacity var(--dur-fast) var(--ease-out);
  transform-origin: center;
}

/* 汉堡 → X 变形（main.js:initMobileNav 在打开时加 .open） */
.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== 主内容区 ===== */
.main-content {
  position: relative;
  z-index: 1;
  padding-top: 70px;
}

/* ===== Hero 区域 ===== */
.hero {
  min-height: calc(100vh - 70px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    ellipse at center,
    var(--accent-05) 0%,
    transparent 70%
  );
  animation: heroGlow 8s ease-in-out infinite;
}

@keyframes heroGlow {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-3%, 3%); }
}

.hero-content {
  max-width: 800px;
  position: relative;
  z-index: 1;
  animation: fadeInUp 1s ease-out;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.2rem;
  background: var(--accent-10);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--white), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero h1 .accent {
  -webkit-text-fill-color: var(--accent);
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.8rem;
  border-radius: var(--radius-btn);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: var(--primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--accent-shadow-hover);
  color: var(--primary);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--accent);
  color: var(--accent);
}

.btn-outline:hover {
  background: var(--accent-10);
  transform: translateY(-2px);
  color: var(--accent);
}

/* ===== 区域通用 ===== */
.section {
  padding: 5rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 0.5rem;
}

.section-header p {
  color: var(--text-light);
  font-size: 1.05rem;
}

.section-divider {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  border-radius: 2px;
  margin: 1rem auto;
}

/* ===== 卡片 ===== */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-30);
  box-shadow: var(--shadow);
}

#latest-articles .blog-card.card:hover {
  transform: translateY(-2px);
}

/* ===== 研究方向标签云 ===== */
.research-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.research-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--white);
  font-size: var(--font-size-small);
  text-decoration: none;
  transition: background var(--transition-normal), color var(--transition-normal), transform var(--transition-normal), box-shadow var(--transition-normal);
}

.research-tag:hover {
  background: var(--accent);
  color: var(--bg-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.research-tag:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.research-detail-card {
  padding: var(--spacing-lg) var(--spacing-xl);
}

.research-detail-card:first-of-type {
  margin-top: var(--spacing-xl);
}

.research-detail-card:not(:first-of-type) {
  margin-top: var(--spacing-md);
}

.research-detail-card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.research-detail-card-header i {
  color: var(--accent);
  font-size: 1.2rem;
}

.research-detail-card h3 {
  font-size: 1.15rem;
  color: var(--white);
  margin: 0;
}

.research-detail-card p {
  color: var(--text-light);
  font-size: 0.95rem;
  margin: 0;
}

/* ===== 首页特色卡片 ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  text-align: center;
  padding: 2.5rem 2rem;
}

.feature-icon {
  width: 70px;
  height: 70px;
  margin: 0 auto 1.5rem;
  background: linear-gradient(135deg, var(--accent-gradient-start), var(--accent-gradient-end));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  border: 1px solid var(--border);
}

.feature-card h3 {
  font-size: 1.25rem;
  color: var(--white);
  margin-bottom: 0.75rem;
}

.feature-card p {
  color: var(--text-light);
  font-size: 0.95rem;
}

.features-grid > a {
  text-decoration: none;
}

.noscript-notice {
  text-align: center;
  color: var(--text-light);
  padding: 2rem;
}

/* ===== 人物介绍页 ===== */
.profile-hero {
  padding: 6rem 2rem 3rem;
  text-align: center;
  position: relative;
}

.profile-avatar {
  width: 220px;
  height: 280px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  margin: 0 auto 1.5rem;
  display: block;
  object-fit: contain;
  font-size: 3.5rem;
  color: var(--primary);
  font-weight: 700;
  border: 4px solid var(--accent-30);
  /* AR13合规说明: 装饰性发光阴影，使用强调色半透明变量 */
  box-shadow: 0 0 40px var(--accent-20);
}

.profile-name {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 0.5rem;
}

.profile-title {
  font-size: 1.15rem;
  color: var(--accent);
  margin-bottom: 0.3rem;
}

.profile-dept {
  color: var(--text-light);
  font-size: 1rem;
}

.profile-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.tag {
  padding: 0.35rem 1rem;
  background: var(--accent-10);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  color: var(--accent);
}

/* 信息网格 */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.info-card {
  text-align: center;
  padding: 2rem 1.5rem;
}

.info-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.3rem;
}

.info-label {
  color: var(--text-light);
  font-size: 0.9rem;
}

.info-label--copyable {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

/* TD2-3: 人物介绍页语义化类 — 替换内联样式 */
.section-compact {
  padding-top: 0;
}

.section-padded {
  padding: 2rem 2rem 5rem;
}

.line-height-loose {
  line-height: 2;
}

.mt-md {
  margin-top: 1rem;
}

.subsection-title {
  color: var(--accent);
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
}

.grid-stats {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.stat-icon {
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-light);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition-normal), color var(--transition-normal), border-color var(--transition-normal);
  font-size: 0.85rem;
  line-height: 1;
}

.copy-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.copy-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.copy-btn.copied {
  color: var(--success);
  border-color: var(--success);
}

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--bg-primary);
  font-size: var(--font-size-small);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: 1100;
}

.toast.visible {
  opacity: 1;
}

/* 时间线 */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), transparent);
}

.timeline-item {
  position: relative;
  padding-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -2rem;
  top: 0.5rem;
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  transform: translateX(-4px);
}

.timeline-item .time {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
}

.timeline-item .place {
  color: var(--white);
  font-weight: 600;
  font-size: 1rem;
}

.timeline-item .detail {
  color: var(--text-light);
  font-size: 0.9rem;
}

/* PaperTable 论文表格 */
.paper-table {
  width: 100%;
  border-collapse: collapse;
}

.paper-table thead {
  background: var(--bg-secondary);
}

.paper-table th {
  color: var(--text);
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
}

.paper-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.5;
}

.paper-table tbody tr:nth-child(even) {
  background: var(--bg-secondary);
}

.paper-table tbody tr {
  transition: background var(--transition-fast);
}

.paper-table tbody tr:hover {
  background: var(--bg-hover);
}

.paper-table .paper-num {
  width: 3rem;
  text-align: center;
  color: var(--text-light);
}

.paper-table .paper-title-col {
  line-height: 1.6;
}

.paper-table .paper-note {
  color: var(--success);
  font-size: 0.8rem;
  font-weight: 400;
}

.paper-table .paper-if {
  text-align: center;
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
}

/* SCI 分区标签 */
.paper-quartile {
  display: inline-block;
  font-size: var(--font-size-tag);
  font-weight: 600;
  padding: 0.1rem 0.35rem;
  border-radius: var(--radius-tag);
  vertical-align: middle;
  margin-left: 0.35rem;
  line-height: 1.4;
}

.paper-quartile.q1 {
  background: var(--accent-15);
  color: var(--accent);
  border: 1px solid var(--accent-30);
}

/* Top 期刊徽章 */
.paper-badge.top {
  display: inline-block;
  font-size: var(--font-size-tag);
  font-weight: 700;
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-tag);
  vertical-align: middle;
  margin-left: 0.25rem;
  line-height: 1.4;
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid var(--success);
}

/* 项目网格 */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.project-card {
  padding: 1.5rem;
}

.project-card:hover {
  transform: translateY(-2px);
}

.project-card h3 {
  color: var(--white);
  font-size: var(--font-size-h4);
  margin-bottom: 0.5rem;
}

.project-desc {
  color: var(--text-light);
  font-size: var(--font-size-small);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.project-fund {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: var(--font-size-small);
  color: var(--text-light);
  margin-bottom: 0.5rem;
}

.project-meta-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.project-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: var(--font-size-small);
  color: var(--text-light);
}

.project-status {
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
}

.project-status.active {
  background: var(--success-bg);
  color: var(--success);
}

.project-status.completed {
  background: var(--text-light-bg);
  color: var(--text-light);
}

/* ===== 博客页 ===== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.blog-card {
  overflow: hidden;
  transition: var(--transition);
}

.blog-card-img {
  height: 200px;
  background: linear-gradient(135deg, var(--secondary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  position: relative;
  overflow: hidden;
}

.blog-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.blog-card:hover .blog-card-img img {
  transform: none;
}

.blog-card-img::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: linear-gradient(transparent, var(--card-bg));
}

.blog-card-body {
  padding: 1.5rem;
}

.blog-category {
  display: inline-block;
  padding: 0.25rem 0.8rem;
  background: linear-gradient(135deg, var(--accent-08), var(--accent-15));
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.blog-card h3 {
  font-size: 1.2rem;
  color: var(--white);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.blog-card-link {
  color: inherit;
  text-decoration: none;
}

.blog-card-link:focus-visible {
  outline: none;
  border-radius: var(--radius);
  box-shadow: 0 0 0 2px var(--bg-primary), 0 0 0 4px var(--accent);
}

@media (forced-colors: active) {
  .blog-card-link:focus-visible {
    outline: 2px solid LinkText;
    outline-offset: 2px;
    box-shadow: none;
  }
}

.articles-loading {
  text-align: center;
  padding: 3rem 0;
}

.articles-loading-icon {
  font-size: 1.5rem;
  color: var(--accent);
}

.articles-loading-text {
  margin-top: 0.75rem;
  color: var(--text-light);
}

.articles-error-card {
  text-align: center;
  padding: 2rem;
  max-width: 400px;
  margin: 0 auto;
}

.articles-error-icon {
  font-size: 1.5rem;
  color: var(--accent);
}

.articles-error-text {
  margin-top: 0.75rem;
  color: var(--text-light);
}

.blog-card p {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

#latest-articles .blog-card p {
  -webkit-line-clamp: 2;
}

.blog-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  border-image: linear-gradient(to right, transparent, var(--border), transparent) 1;
  font-size: 0.85rem;
  color: var(--text-light);
}

.blog-card:hover .blog-card-img {
  filter: brightness(1.05);
}

/* ===== 导航站 ===== */
.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
}

.link-card {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  overflow: hidden;
}

.link-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  transform: scaleX(0);
  transition: var(--transition);
}

.link-card:hover::before {
  transform: scaleX(1);
}

.link-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.link-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-icon);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.link-card h3 {
  font-size: 1.15rem;
  color: var(--white);
}

.link-card h3 small {
  display: block;
  font-size: 0.8rem;
  color: var(--text-light);
  font-weight: 400;
  margin-top: 0.2rem;
}

.link-card p {
  color: var(--text-light);
  font-size: 0.9rem;
  flex-grow: 1;
}

.link-card .link-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.link-card .link-tags span {
  padding: 0.2rem 0.6rem;
  background: var(--accent-08);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--text-light);
}

.link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
}

.link-btn:hover {
  gap: 0.8rem;
}

/* ===== 页脚 ===== */
.footer {
  text-align: center;
  padding: 2rem 2rem 2.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-light);
  font-size: 0.85rem;
  position: relative;
  z-index: 1;
}

.footer a {
  color: var(--accent);
}

.footer .copyright {
  margin-bottom: 0.8rem;
}

.footer .record-row {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer .record {
  color: var(--text-light);
  text-decoration: none;
  transition: var(--transition);
  font-size: 0.8rem;
}

.footer .record:hover {
  color: var(--accent);
  text-decoration: underline;
}

.footer .record-ga {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
  color: var(--text-light);
  font-size: 0.8rem;
  transition: var(--transition);
}

.footer .record-ga:hover {
  color: var(--accent);
}

.footer .beian-icon {
  width: 16px;
  height: 16px;
  vertical-align: middle;
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--primary);
}

::-webkit-scrollbar-thumb {
  background: var(--secondary);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* ===== 照片墙 ===== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.gallery-item {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--primary-light);
  cursor: pointer;
  transition: var(--transition);
}

.gallery-item:hover {
  border-color: var(--accent-40);
  box-shadow: var(--accent-shadow-hover);
  transition: border-color var(--transition), box-shadow var(--transition), opacity var(--transition-fast), transform var(--transition-fast);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* 分类徽章 */
.photo-category-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: var(--overlay-badge-bg);
  color: var(--text-on-accent);
  font-size: var(--font-size-small);
  backdrop-filter: blur(4px);
  z-index: 1;
  pointer-events: none;
}

/* 悬停遮罩 */
.photo-hover-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  background: var(--overlay-hover-gradient);
  padding-bottom: 12px;
  opacity: 0;
  transition: opacity var(--transition-fast);
  z-index: 1;
  pointer-events: none;
}

.gallery-item:hover .photo-hover-overlay {
  opacity: 1;
}

.photo-hover-title {
  color: var(--overlay-hover-text);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
}

/* ===== 灯箱 ===== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: var(--overlay-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  backdrop-filter: blur(8px);
}

.lightbox.active {
  opacity: 1;
  pointer-events: all;
}

.lightbox-img {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: var(--radius);
  /* AR13合规说明: 灯箱纯黑阴影，不可变量化 */
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  transition: transform 0.3s ease;
}

.lightbox.active .lightbox-img {
  animation: fadeInUp 0.3s ease;
}

.lightbox-close,
.lightbox-prev,
.lightbox-next {
  position: absolute;
  background: var(--accent-15);
  border: 1px solid var(--accent-30);
  color: var(--accent);
  cursor: pointer;
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: var(--transition);
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
  background: var(--accent-30);
}

.lightbox-close {
  top: 1.5rem;
  right: 1.5rem;
}

.lightbox-prev {
  left: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
}

.lightbox-next {
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
}

.lightbox-counter {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-light);
  font-size: 0.9rem;
  background: var(--overlay-light);
  padding: 0.4rem 1.2rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .navbar {
    padding: 0 1rem;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--mobile-nav-bg);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 1rem;
    gap: 0.25rem;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-links a {
    padding: 0.8rem 1rem;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .section {
    padding: 3rem 1rem;
  }

  .section-header h2 {
    font-size: 1.8rem;
  }

  .profile-name {
    font-size: 2rem;
  }

  .blog-grid {
    grid-template-columns: 1fr;
  }

  .links-grid {
    grid-template-columns: 1fr;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .project-grid {
    grid-template-columns: 1fr;
  }

  .lightbox-prev {
    left: 0.5rem;
  }

  .lightbox-next {
    right: 0.5rem;
  }

  .paper-table thead {
    display: none;
  }

  .paper-table tbody {
    display: block;
  }

  .paper-table tbody tr {
    display: block;
    margin-bottom: 1rem;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
  }

  .paper-table tbody tr:nth-child(even) {
    background: var(--bg-secondary);
  }

  .paper-table td {
    display: block;
    padding: 0.2rem 0;
    border-bottom: none;
  }

  .paper-table td::before {
    content: attr(data-label);
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--text-light);
    margin-right: 0.5rem;
  }

  .paper-table td:not([data-label])::before {
    content: none;
  }

  .paper-table .paper-num {
    display: none;
  }

  .paper-table .paper-title-col {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1.5;
    margin-bottom: 0.3rem;
  }

  .paper-table .paper-note {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.8rem;
  }

  .paper-table .paper-journal {
    font-size: 0.875rem;
    color: var(--text-light);
    font-style: italic;
  }

  .paper-table .paper-year::before {
    content: ' · ';
  }

  .paper-table .paper-year {
    display: inline;
    font-size: 0.875rem;
    color: var(--text-light);
  }

  .paper-table .paper-if {
    text-align: left;
    white-space: normal;
  }

  .paper-table .paper-if .paper-quartile,
  .paper-table .paper-if .paper-badge {
    margin-top: 0.15rem;
  }

  .patent-table td:last-child {
    font-size: 0.8rem;
    color: var(--text-light);
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .info-grid {
    grid-template-columns: 1fr 1fr;
  }

  .grid-stats {
    grid-template-columns: 1fr 1fr;
  }

  .project-grid {
    gap: 1rem;
  }

  .project-card {
    padding: 1.25rem;
  }
}

@media (max-width: 1024px) {
  .gallery-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .paper-table .paper-if {
    white-space: normal;
  }
}

@media (max-width: 768px) {
  .gallery-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== 无障碍增强 ===== */

/* 跳转链接（Story 1.7 范围，CSS 预留） */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: var(--primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  z-index: 10000;
  font-weight: 600;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--spacing-sm);
}

/* 焦点可见性 */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

main:focus {
  outline: none;
}

/* ===== 工具类 ===== */
.hidden {
  display: none !important;
}

/* 应用状态机 */
.app-loading #navbar,
.app-loading #footer-placeholder,
.app-loading .main-content {
  opacity: 0;
}

.app-loaded #navbar,
.app-loaded #footer-placeholder,
.app-loaded .main-content {
  opacity: 1;
  transition: opacity var(--transition-normal);
}

.app-error #navbar,
.app-error #footer-placeholder {
  display: none;
}

.app-error .main-content {
  opacity: 1;
}

.app-error body::after {
  content: '部分功能加载失败，请刷新页面重试';
  position: fixed;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-15);
  color: var(--accent);
  padding: 0.5rem 1.5rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--accent-30);
  font-size: 0.85rem;
  z-index: 9999;
  pointer-events: none;
}

/* 空组件占位（JS 注入前） */
#navbar:empty,
#footer-placeholder:empty {
  min-height: 0;
  height: auto;
}

.navbar:empty {
  min-height: 0;
  height: auto;
}

/* noscript 样式 */
noscript .navbar,
noscript .footer {
  display: block;
}

noscript .nav-toggle--noscript,
noscript .theme-toggle-noscript {
  display: none;
}

/* 字体回退 */
[data-fonts-fallback] body {
  font-family: var(--font-family-sans);
}
[data-fonts-fallback] .article-content {
  font-family: "Times New Roman", "Georgia", "STSong", "SimSun", "Songti SC", "Noto Serif SC", serif;
}

/* 滚动偏移（固定导航栏锚点跳转） */
html {
  scroll-padding-top: var(--header-height);
}

/* 主题切换过渡 */
.theme-transitioning *,
.theme-transitioning *::before,
.theme-transitioning *::after {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease !important;
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .animate-on-scroll {
    opacity: 1;
    transform: none;
  }

  .theme-transitioning *,
  .theme-transitioning *::before,
  .theme-transitioning *::after {
    transition-duration: 0.01ms !important;
  }
}

/* ====================================================================== */
/* ===== 阅读增强：进度条 / 返回顶部 / 文章目录（仅文章页，JS 动态注入） ===== */
/* ====================================================================== */

/* ----- 阅读进度条 ----- */
.reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 1100;
  background: transparent;
  pointer-events: none;
}
.reading-progress-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  box-shadow: 0 0 8px var(--accent-40);
  transition: width 0.1s linear;
}

/* ----- 返回顶部按钮 ----- */
.back-to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  width: 46px;
  height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--card-bg);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: var(--accent);
  font-size: 1rem;
  cursor: pointer;
  z-index: 1050;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  box-shadow: var(--shadow-md);
  transition: opacity var(--dur) var(--ease-out),
              visibility var(--dur) var(--ease-out),
              transform var(--dur) var(--ease-spring),
              background var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--accent-15);
  color: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: var(--accent-shadow-hover);
}
.back-to-top:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ----- 文章目录 TOC（桌面右侧 sticky，窄屏隐藏） ----- */
.article-toc {
  position: fixed;
  top: 50%;
  right: 1.5rem;
  transform: translateY(-50%);
  width: 220px;
  max-height: 60vh;
  overflow-y: auto;
  padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) var(--spacing-lg);
  background: var(--card-bg);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  z-index: 900;
  font-size: var(--font-size-small);
}
.article-toc-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--border);
}
.article-toc-toggle {
  width: 20px;
  height: 20px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.7rem;
  transition: transform var(--dur) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.article-toc-toggle::before {
  content: "▾";
}
.article-toc.collapsed .article-toc-toggle {
  transform: rotate(-90deg);
}
.article-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 50vh;
  overflow-y: auto;
  transition: max-height var(--dur) var(--ease-out), opacity var(--dur-fast) var(--ease-out);
}
.article-toc.collapsed .article-toc-list {
  max-height: 0;
  opacity: 0;
}
.article-toc-item {
  margin: 0;
}
.article-toc-item a {
  display: block;
  padding: 0.3rem 0.4rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  line-height: 1.4;
  transition: color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}
.article-toc-item--h3 a {
  padding-left: 1.1rem;
  font-size: 0.8rem;
}
.article-toc-item a:hover {
  color: var(--accent);
  background: var(--accent-05);
}
.article-toc-item.active a {
  color: var(--accent);
  font-weight: 600;
  border-left-color: var(--accent);
  background: var(--accent-08);
}
.article-toc-item a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* TOC 滚动条美化 */
.article-toc::-webkit-scrollbar,
.article-toc-list::-webkit-scrollbar {
  width: 4px;
}
.article-toc::-webkit-scrollbar-thumb,
.article-toc-list::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

/* 窄屏：隐藏 TOC（内容优先），保留进度条 + 返回顶部 */
@media (max-width: 1180px) {
  .article-toc {
    display: none;
  }
}
@media (max-width: 480px) {
  .back-to-top {
    right: 1rem;
    bottom: 1rem;
    width: 42px;
    height: 42px;
  }
}