/* ============================================================
   China-ASEAN Digital Academy — Global Brand Stylesheet
   中国-东盟数字学院 全局品牌样式
   Brand: Bright Blue (#4A5AFF) + Deep Blue (#2A2F8A) + Gold (#D4AF37) + Cyan Accent
   Logo: 十一边形(东盟十一国) + 椭圆(连接流动) + 点状虚线(0/1数字语言)
   ============================================================ */

/* ---------- CSS Variables / Design Tokens ---------- */
:root {
  /* Brand Colors — 中国-东盟数字学院品牌色 */
  --color-primary: #4A5AFF;        /* 亮蓝，主视觉色 (KT板背景色) */
  --color-primary-light: #6B7BFF;
  --color-primary-dark: #2A2F8A;    /* 深蓝，深色背景/辅助 (纪念圆盘外圈) */
  --color-accent: #00B4D8;          /* 青色，数字科技辅助色 */
  --color-accent-light: #48CAE4;
  --color-accent-dark: #0077B6;
  --color-gold: #D4AF37;             /* 金色，点缀色 (纪念圆盘内圈) */
  --color-gold-light: #E8C87A;

  /* Neutrals */
  --color-bg: #ffffff;
  --color-bg-alt: #F5F7FF;
  --color-bg-dark: #2A2F8A;
  --color-text: #1A1A2E;
  --color-text-light: #5A6A7A;
  --color-text-inverse: #ffffff;
  --color-border: #DCE3F5;
  --color-border-light: #EEF1FF;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-serif: 'Georgia', 'Times New Roman', 'Songti SC', serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;
  --header-height: 72px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(10, 46, 92, 0.08);
  --shadow-md: 0 4px 12px rgba(10, 46, 92, 0.1);
  --shadow-lg: 0 8px 30px rgba(10, 46, 92, 0.12);
  --shadow-xl: 0 20px 60px rgba(10, 46, 92, 0.15);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Z-index */
  --z-header: 100;
  --z-dropdown: 200;
  --z-modal: 300;
  --z-toast: 400;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg, video {
  max-width: 100%;
  height: auto;
  display: block;
}

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

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-primary-dark);
}

h1 { font-size: clamp(2rem, 5vw, 3rem); margin-bottom: var(--space-lg); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); margin-bottom: var(--space-lg); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); margin-bottom: var(--space-md); }
h4 { font-size: 1.2rem; margin-bottom: var(--space-sm); }

p {
  margin-bottom: var(--space-md);
}

/* ---------- Layout Utilities ---------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container-narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-3xl) 0;
}

.section-alt {
  background-color: var(--color-bg-alt);
}

.section-dark {
  background-color: var(--color-bg-dark);
  color: var(--color-text-inverse);
}

.section-dark h1, .section-dark h2, .section-dark h3 {
  color: var(--color-text-inverse);
}

.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.flex {
  display: flex;
  gap: var(--space-md);
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ---------- Header / Navigation ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  height: var(--header-height);
}

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.site-logo:hover {
  color: var(--color-primary);
}

.site-logo img {
  height: 40px;
  width: auto;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-text .logo-main {
  font-size: 1.1rem;
  font-weight: 700;
}

.logo-text .logo-sub {
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--color-text-light);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* Main Nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: nowrap;
}

.nav-item {
  position: relative;
  flex-shrink: 0;
}

.nav-link {
  display: block;
  padding: 6px 10px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background-color: var(--color-bg-alt);
}

.nav-link.active {
  color: var(--color-accent);
  font-weight: 600;
}

/* Dropdown */
.nav-item.has-dropdown .nav-link::after {
  content: '';
  display: inline-block;
  margin-left: 6px;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  vertical-align: middle;
  transition: transform var(--transition-fast);
}

.nav-item.has-dropdown:hover .nav-link::after {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-base);
  padding: var(--space-sm) 0;
  z-index: var(--z-dropdown);
}

.nav-item.has-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: block;
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.88rem;
  color: var(--color-text);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.dropdown-item:hover {
  background-color: var(--color-bg-alt);
  color: var(--color-accent);
  padding-left: calc(var(--space-lg) + 4px);
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-left: var(--space-md);
  padding-left: var(--space-md);
  border-left: 1px solid var(--color-border);
}

.lang-btn {
  padding: 4px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-light);
  background: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  color: var(--color-primary);
}

.lang-btn.active {
  color: var(--color-primary);
  background-color: var(--color-bg-alt);
  border-color: var(--color-border);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  transition: all var(--transition-base);
}

/* ---------- Hero Section ---------- */
.hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
  color: var(--color-text-inverse);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(45, 138, 78, 0.2) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(201, 162, 39, 0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background-color: rgba(201, 162, 39, 0.2);
  border: 1px solid var(--color-gold);
  border-radius: 100px;
  color: var(--color-gold-light);
  margin-bottom: var(--space-lg);
}

.hero h1 {
  color: var(--color-text-inverse);
  margin-bottom: var(--space-md);
}

.hero p {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--space-xl);
  max-width: 600px;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* Page Hero (inner pages) */
.page-hero {
  position: relative;
  padding: var(--space-3xl) 0 var(--space-2xl);
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: var(--color-text-inverse);
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: radial-gradient(ellipse at right center, rgba(45, 138, 78, 0.15) 0%, transparent 70%);
}

.page-hero-content {
  position: relative;
  z-index: 1;
}

.page-hero h1 {
  color: var(--color-text-inverse);
  margin-bottom: var(--space-sm);
}

.page-hero .breadcrumb {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: var(--space-md);
}

.page-hero .breadcrumb a {
  color: rgba(255, 255, 255, 0.8);
}

.page-hero .breadcrumb a:hover {
  color: var(--color-gold-light);
}

.page-hero p {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.8);
  max-width: 640px;
  margin-bottom: 0;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: var(--color-text-inverse);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text-inverse);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--color-text-inverse);
  color: var(--color-text-inverse);
}

.btn-outline-dark {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline-dark:hover {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn-gold {
  background-color: var(--color-gold);
  color: var(--color-primary-dark);
  border-color: var(--color-gold);
}

.btn-gold:hover {
  background-color: var(--color-gold-light);
  border-color: var(--color-gold-light);
  color: var(--color-primary-dark);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}

/* ---------- Cards ---------- */
.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--color-border);
}

.card-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  color: var(--color-text-inverse);
  font-size: 1.5rem;
}

.card-icon.green {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
}

.card-icon.gold {
  background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-light) 100%);
}

.card h3 {
  margin-bottom: var(--space-sm);
}

.card p {
  color: var(--color-text-light);
  font-size: 0.92rem;
  margin-bottom: 0;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--space-md);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-accent);
}

.card-link::after {
  content: '→';
  transition: transform var(--transition-fast);
}

.card-link:hover::after {
  transform: translateX(4px);
}

/* Publication / Event Card */
.item-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.item-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.item-card-image {
  height: 180px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  position: relative;
  overflow: hidden;
}

.item-card-image.green {
  background: linear-gradient(135deg, var(--color-accent-dark) 0%, var(--color-accent) 100%);
}

.item-card-image.gold {
  background: linear-gradient(135deg, #a8861a 0%, var(--color-gold) 100%);
}

.item-card-body {
  padding: var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.item-card-tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background-color: var(--color-bg-alt);
  color: var(--color-primary);
  border-radius: 100px;
  margin-bottom: var(--space-sm);
  align-self: flex-start;
}

.item-card-tag.green {
  background-color: rgba(45, 138, 78, 0.1);
  color: var(--color-accent);
}

.item-card-tag.gold {
  background-color: rgba(201, 162, 39, 0.15);
  color: #a8861a;
}

.item-card h3 {
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
}

.item-card-meta {
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-sm);
}

.item-card p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  flex: 1;
}

/* ---------- Section Headers ---------- */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--space-2xl);
}

.section-header .section-label {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.section-header h2 {
  margin-bottom: var(--space-md);
}

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

/* ---------- Stats / Numbers ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
  text-align: center;
}

.stat-item .stat-number {
  font-family: var(--font-serif);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--color-gold);
  line-height: 1;
  margin-bottom: var(--space-sm);
}

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

/* ---------- Programme Cards ---------- */
.programme-card {
  position: relative;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  border-top: 4px solid var(--color-primary);
}

.programme-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.programme-card.green { border-top-color: var(--color-accent); }
.programme-card.gold { border-top-color: var(--color-gold); }
.programme-card.blue { border-top-color: var(--color-primary-light); }

.programme-badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-radius: 100px;
  margin-bottom: var(--space-md);
}

.programme-badge.blue { background-color: rgba(10, 46, 92, 0.08); color: var(--color-primary); }
.programme-badge.green { background-color: rgba(45, 138, 78, 0.1); color: var(--color-accent); }
.programme-badge.gold { background-color: rgba(201, 162, 39, 0.15); color: #a8861a; }

.programme-card h3 {
  margin-bottom: var(--space-sm);
}

.programme-card .programme-desc {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-lg);
}

.programme-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
}

.programme-meta-item {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

.programme-meta-item strong {
  display: block;
  color: var(--color-text);
  font-size: 0.85rem;
}

/* ---------- Timeline (Events) ---------- */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-xl);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -30px;
  top: 6px;
  width: 16px;
  height: 16px;
  background-color: var(--color-bg);
  border: 3px solid var(--color-accent);
  border-radius: 50%;
}

.timeline-date {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.timeline-item h4 {
  margin-bottom: var(--space-xs);
}

.timeline-item p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* ---------- Resource / Download List ---------- */
.resource-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.resource-item {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

.resource-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  font-size: 1.2rem;
}

.resource-info {
  flex: 1;
}

.resource-info h4 {
  font-size: 0.98rem;
  margin-bottom: 2px;
}

.resource-info .resource-meta {
  font-size: 0.78rem;
  color: var(--color-text-light);
}

.resource-action {
  flex-shrink: 0;
}

/* ---------- Contact Form ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-2xl);
}

.contact-info-block {
  margin-bottom: var(--space-xl);
}

.contact-info-block h4 {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
  font-size: 1rem;
}

.contact-info-block p,
.contact-info-block a {
  font-size: 0.92rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.form-group label .required {
  color: #d32f2f;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(45, 138, 78, 0.1);
}

textarea.form-control {
  min-height: 140px;
  resize: vertical;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

/* ---------- Sitemap Page ---------- */
.sitemap-tree {
  padding: var(--space-xl);
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 2;
  overflow-x: auto;
}

.sitemap-tree .tree-root { color: var(--color-primary); font-weight: 700; }
.sitemap-tree .tree-branch { color: var(--color-accent); }
.sitemap-tree .tree-leaf { color: var(--color-text); }
.sitemap-tree .tree-indent { color: var(--color-border); }

.sitemap-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-xl);
}

.sitemap-column h4 {
  font-size: 0.95rem;
  color: var(--color-primary);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-accent);
  margin-bottom: var(--space-md);
}

.sitemap-column ul li {
  margin-bottom: var(--space-xs);
}

.sitemap-column ul li a {
  font-size: 0.88rem;
  color: var(--color-text-light);
}

.sitemap-column ul li a:hover {
  color: var(--color-accent);
}

/* ---------- Footer ---------- */
.site-footer {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-3xl) 0 var(--space-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand .footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.footer-brand .footer-logo img {
  height: 36px;
}

.footer-brand .footer-logo-text {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-inverse);
}

.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.footer-social {
  display: flex;
  gap: var(--space-sm);
}

.footer-social a {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.85rem;
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
}

.footer-column h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text-inverse);
  margin-bottom: var(--space-lg);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.footer-column ul li {
  margin-bottom: var(--space-sm);
}

.footer-column ul li a {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition-fast);
}

.footer-column ul li a:hover {
  color: var(--color-gold-light);
}

.footer-bottom {
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-bottom p {
  font-size: 0.78rem;
  margin-bottom: 0;
}

.footer-bottom-links {
  display: flex;
  gap: var(--space-lg);
}

.footer-bottom-links a {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom-links a:hover {
  color: var(--color-text-inverse);
}

/* ---------- Tags / Badges ---------- */
.tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: 100px;
  background-color: var(--color-bg-alt);
  color: var(--color-primary);
}

.tag-green { background-color: rgba(45, 138, 78, 0.1); color: var(--color-accent); }
.tag-gold { background-color: rgba(201, 162, 39, 0.15); color: #a8861a; }
.tag-blue { background-color: rgba(10, 46, 92, 0.08); color: var(--color-primary); }

/* ---------- Alert / Notice ---------- */
.notice {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--color-accent);
  background-color: rgba(45, 138, 78, 0.05);
  margin-bottom: var(--space-lg);
}

.notice p {
  margin-bottom: 0;
  font-size: 0.9rem;
}

.notice.info {
  border-left-color: var(--color-primary);
  background-color: rgba(10, 46, 92, 0.04);
}

.notice.warning {
  border-left-color: var(--color-gold);
  background-color: rgba(201, 162, 39, 0.08);
}

/* ---------- Table ---------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.data-table thead th {
  text-align: left;
  padding: var(--space-md);
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  font-weight: 600;
  font-size: 0.85rem;
}

.data-table thead th:first-child { border-radius: var(--radius-sm) 0 0 0; }
.data-table thead th:last-child { border-radius: 0 var(--radius-sm) 0 0; }

.data-table tbody td {
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-border-light);
}

.data-table tbody tr:hover {
  background-color: var(--color-bg-alt);
}

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: all var(--transition-base);
  z-index: var(--z-toast);
  border: none;
  cursor: pointer;
  font-size: 1.2rem;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background-color: var(--color-accent);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  :root {
    --space-3xl: 3rem;
    --space-2xl: 2.5rem;
  }

  /* 导航折叠为移动端菜单 */
  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-md);
    gap: 4px;
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--color-border-light);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }

  .main-nav.open {
    display: flex;
  }

  .main-nav .nav-item {
    width: 100%;
  }

  .main-nav .nav-link {
    padding: 12px 16px;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .nav-item.has-dropdown .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding-left: var(--space-lg);
    display: none;
    min-width: auto;
  }

  .nav-item.has-dropdown.open .dropdown-menu {
    display: block;
  }

  /* Grid布局适配 */
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }

  .lang-switcher {
    display: none;
  }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: 420px;
    padding: var(--space-2xl) 0;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .stat-item .stat-number { font-size: 2.2rem; }
}

/* ---------- 蓝色背景区块文字统一为白色 ---------- */
.hero, .hero h1, .hero h2, .hero h3, .hero h4, .hero p, .hero span, .hero a, .hero li, .hero strong, .hero small,
.page-hero, .page-hero h1, .page-hero h2, .page-hero h3, .page-hero p, .page-hero span, .page-hero a, .page-hero li, .page-hero .breadcrumb, .page-hero .breadcrumb a,
.site-footer, .site-footer h1, .site-footer h2, .site-footer h3, .site-footer h4, .site-footer p, .site-footer span, .site-footer a, .site-footer li, .site-footer strong, .site-footer small,
.site-footer .footer-logo-text, .site-footer .footer-brand p, .site-footer .footer-social a,
.item-card-image, .item-card-image h3, .item-card-image h4, .item-card-image p, .item-card-image span,
.data-table thead th, .data-table thead th *,
.stat-card-icon, .stat-card-icon *,
.btn-primary, .btn-primary:hover, .btn-primary-dark, .btn-primary-dark:hover,
.back-to-top, .back-to-top:hover,
.programme-card-header, .programme-card-header h3, .programme-card-header p, .programme-card-header span,
.cta-section, .cta-section h2, .cta-section p, .cta-section a, .cta-section span,
.banner-blue, .banner-blue h1, .banner-blue h2, .banner-blue h3, .banner-blue p, .banner-blue a, .banner-blue span,
.section-blue, .section-blue h1, .section-blue h2, .section-blue h3, .section-blue h4, .section-blue p, .section-blue a, .section-blue span, .section-blue li,
.comments-section-header h2,
.annotation-panel-header, .annotation-panel-header h4 {
  color: #ffffff !important;
}

/* 蓝色背景内的辅助文字使用半透明白色（保持可读性层次） */
.hero p, .hero .hero-subtitle, .hero .hero-meta,
.page-hero p, .page-hero .page-subtitle,
.site-footer p, .site-footer li, .site-footer a, .site-footer .footer-bottom,
.site-footer .footer-social a {
  color: rgba(255, 255, 255, 0.85) !important;
}

.site-footer a:hover {
  color: #ffffff !important;
}

/* ============================================================
   视觉优化 V2 — 参考 nepaleconomicforum.org 编辑杂志风格
   只改UI视觉，不改动业务逻辑、栏目结构、文字内容
   ============================================================ */

/* ---------- 1. 顶部导航栏优化 ---------- */
.site-header {
  height: 76px;
  box-shadow: 0 1px 0 rgba(0,0,0,0.04);
  border-bottom: none;
}

.header-inner {
  gap: 24px;
}

.main-nav {
  gap: 4px;
}

.main-nav .nav-link {
  position: relative;
  padding: 8px 14px;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: #2c2c2c;
  border-radius: 0;
  transition: color 0.25s ease;
}

/* hover下划线动画效果 */
.main-nav .nav-link::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-gold));
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  transform: translateX(-50%);
}

.main-nav .nav-link:hover {
  color: var(--color-primary);
  background: transparent;
}

.main-nav .nav-link:hover::before {
  width: calc(100% - 28px);
}

.main-nav .nav-link.active {
  color: var(--color-primary);
  background: transparent;
  font-weight: 600;
}

.main-nav .nav-link.active::before {
  width: calc(100% - 28px);
}

/* 下拉菜单美化 */
.nav-item.has-dropdown .nav-link::after {
  margin-left: 5px;
  border-top-color: currentColor;
  opacity: 0.6;
}

.dropdown-menu {
  top: calc(100% + 8px);
  min-width: 260px;
  background: #ffffff;
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 10px;
  box-shadow: 0 12px 40px rgba(10, 46, 92, 0.12);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.dropdown-menu::before {
  content: '';
  position: absolute;
  top: -6px;
  left: 30px;
  width: 12px;
  height: 12px;
  background: #ffffff;
  border-left: 1px solid rgba(0,0,0,0.06);
  border-top: 1px solid rgba(0,0,0,0.06);
  transform: rotate(45deg);
}

.nav-item.has-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  padding: 10px 20px;
  font-size: 0.85rem;
  color: #3a3a3a;
  transition: all 0.2s ease;
  position: relative;
}

.dropdown-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 0;
  background: var(--color-primary);
  transition: height 0.25s ease;
  transform: translateY(-50%);
}

.dropdown-item:hover {
  background: rgba(74, 90, 255, 0.04);
  color: var(--color-primary);
  padding-left: 24px;
}

.dropdown-item:hover::before {
  height: 60%;
}

/* 语言切换器优化 */
.lang-switcher {
  gap: 4px;
  margin-left: 12px;
  padding-left: 16px;
}

.lang-switcher a {
  padding: 6px 10px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  border-radius: 6px;
  transition: all 0.2s ease;
}

.lang-switcher a:hover {
  background: rgba(74, 90, 255, 0.08);
}

/* ---------- 2. 页面留白与排版优化 ---------- */
body {
  line-height: 1.75;
  color: #2c2c2c;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.section {
  padding: 80px 0;
}

.section-alt {
  background: linear-gradient(180deg, #fafbff 0%, #ffffff 100%);
}

.section-header {
  margin-bottom: 56px;
}

.section-header .section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 16px;
  position: relative;
  padding-left: 28px;
}

.section-header .section-label::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 20px;
  height: 2px;
  background: var(--color-gold);
  transform: translateY(-50%);
}

.section-header h2 {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
  color: #1a1a2e;
  letter-spacing: -0.01em;
}

.section-header p {
  font-size: 1.05rem;
  color: #5a6a7a;
  max-width: 640px;
  line-height: 1.8;
}

/* 标题层级优化 */
h1 { font-size: 2.8rem; line-height: 1.15; letter-spacing: -0.02em; }
h2 { font-size: 2rem; line-height: 1.3; letter-spacing: -0.01em; }
h3 { font-size: 1.35rem; line-height: 1.4; }
h4 { font-size: 1.1rem; line-height: 1.5; }

p {
  margin-bottom: 1.25rem;
  line-height: 1.8;
}

/* 段落首行缩进可选，这里保持左对齐更现代 */

/* ---------- 3. 卡片组件优化 ---------- */
.item-card {
  background: #ffffff;
  border: 1px solid rgba(0,0,0,0.05);
  border-radius: 14px;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 2px 12px rgba(10, 46, 92, 0.04);
}

.item-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(10, 46, 92, 0.12);
  border-color: rgba(74, 90, 255, 0.15);
}

.item-card-image {
  height: 200px;
  position: relative;
  overflow: hidden;
}

.item-card-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.15) 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.item-card:hover .item-card-image::after {
  opacity: 1;
}

.item-card-content {
  padding: 24px;
}

.item-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.45;
  transition: color 0.25s ease;
}

.item-card:hover h3 {
  color: var(--color-primary);
}

.item-card p {
  font-size: 0.9rem;
  color: #6c757d;
  line-height: 1.7;
  margin-bottom: 0;
}

.item-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(0,0,0,0.05);
  font-size: 0.8rem;
  color: #9ca3af;
}

/* 资源卡片优化 */
.resource-item {
  background: #ffffff;
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 12px;
  padding: 28px;
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
}

.resource-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 0;
  background: linear-gradient(180deg, var(--color-primary), var(--color-gold));
  transition: height 0.35s ease;
}

.resource-item:hover {
  transform: translateX(4px);
  box-shadow: 0 12px 36px rgba(10, 46, 92, 0.1);
  border-color: rgba(74, 90, 255, 0.15);
}

.resource-item:hover::before {
  height: 100%;
}

/* ---------- 4. 按钮样式优化 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: 8px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 2px solid transparent;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(74, 90, 255, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(74, 90, 255, 0.35);
  color: #ffffff;
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(74, 90, 255, 0.2);
}

.btn-outline-light {
  background: transparent;
  color: #ffffff;
  border-color: rgba(255,255,255,0.5);
}

.btn-outline-light:hover {
  background: #ffffff;
  color: var(--color-primary);
  border-color: #ffffff;
}

.btn-gold {
  background: linear-gradient(135deg, var(--color-gold) 0%, #c9a227 100%);
  color: #1a1a2e;
  box-shadow: 0 4px 16px rgba(212, 175, 55, 0.3);
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(212, 175, 55, 0.4);
  color: #1a1a2e;
}

/* 文字链接按钮 */
.btn-text {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: gap 0.25s ease;
}

.btn-text:hover {
  gap: 12px;
  color: var(--color-primary-dark);
}

.btn-text::after {
  content: '→';
  transition: transform 0.25s ease;
}

.btn-text:hover::after {
  transform: translateX(4px);
}

/* ---------- 5. Banner/Hero 视觉质感优化 ---------- */
.hero {
  min-height: 580px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #1a1f5c 0%, #2A2F8A 35%, #4A5AFF 70%, #6B7BFF 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.15) 0%, transparent 60%);
  border-radius: 50%;
  animation: heroGlow 8s ease-in-out infinite alternate;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(72, 202, 228, 0.12) 0%, transparent 60%);
  border-radius: 50%;
  animation: heroGlow 10s ease-in-out infinite alternate-reverse;
}

@keyframes heroGlow {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(30px, -20px) scale(1.1); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
}

.hero .hero-label {
  display: inline-block;
  padding: 8px 20px;
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #ffffff;
  margin-bottom: 28px;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  color: #ffffff;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 20px rgba(0,0,0,0.15);
}

.hero p {
  font-size: 1.15rem;
  line-height: 1.85;
  color: rgba(255,255,255,0.88);
  margin-bottom: 40px;
  max-width: 620px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* 二级页面 Banner */
.page-hero {
  padding: 100px 0 80px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #1a1f5c 0%, #2A2F8A 40%, #4A5AFF 100%);
}

.page-hero::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.12) 0%, transparent 60%);
  border-radius: 50%;
}

.page-hero h1 {
  font-size: 2.6rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
  position: relative;
  z-index: 2;
}

.page-hero p {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.85);
  max-width: 680px;
  line-height: 1.8;
  position: relative;
  z-index: 2;
}

.breadcrumb {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
  margin-bottom: 24px;
}

.breadcrumb a {
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  transition: color 0.2s ease;
}

.breadcrumb a:hover {
  color: #ffffff;
}

/* ---------- 6. 板块分割与装饰 ---------- */
.section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(74, 90, 255, 0.15) 50%, transparent 100%);
  margin: 0 auto;
  max-width: 80%;
}

/* 数据统计卡片 */
.stat-card {
  text-align: center;
  padding: 40px 24px;
  background: #ffffff;
  border-radius: 16px;
  border: 1px solid rgba(0,0,0,0.05);
  transition: all 0.35s ease;
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(10, 46, 92, 0.1);
}

.stat-number {
  font-size: 2.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  line-height: 1;
}

.stat-label {
  font-size: 0.9rem;
  color: #6c757d;
  font-weight: 500;
}

/* 标签/徽章优化 */
.tag {
  display: inline-block;
  padding: 5px 14px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  border-radius: 50px;
  background: rgba(74, 90, 255, 0.08);
  color: var(--color-primary);
  transition: all 0.2s ease;
}

.tag:hover {
  background: rgba(74, 90, 255, 0.15);
}

.tag-gold {
  background: rgba(212, 175, 55, 0.12);
  color: #a8861a;
}

.tag-gold:hover {
  background: rgba(212, 175, 55, 0.2);
}

/* ---------- 7. 页脚优化 ---------- */
.site-footer {
  background: linear-gradient(180deg, #1a1f5c 0%, #0f1340 100%);
  padding: 72px 0 32px;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-gold), var(--color-accent));
}

.footer-grid {
  gap: 48px;
  margin-bottom: 56px;
}

.footer-column h4 {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #ffffff;
  margin-bottom: 24px;
  position: relative;
  padding-bottom: 12px;
}

.footer-column h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--color-gold);
}

.footer-column a {
  display: block;
  padding: 6px 0;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  transition: all 0.25s ease;
}

.footer-column a:hover {
  color: #ffffff;
  padding-left: 6px;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
}

/* ---------- 8. 表格优化 ---------- */
.data-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(10, 46, 92, 0.06);
}

.data-table thead th {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: #ffffff;
  padding: 16px 20px;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  text-align: left;
}

.data-table tbody td {
  padding: 16px 20px;
  font-size: 0.9rem;
  color: #3a3a3a;
  border-bottom: 1px solid rgba(0,0,0,0.05);
  background: #ffffff;
  transition: background 0.2s ease;
}

.data-table tbody tr:hover td {
  background: rgba(74, 90, 255, 0.03);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

/* ---------- 9. 回到顶部按钮 ---------- */
.back-to-top {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #ffffff;
  box-shadow: 0 8px 24px rgba(74, 90, 255, 0.3);
  transition: all 0.3s ease;
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(74, 90, 255, 0.4);
  color: #ffffff;
}

/* ---------- 10. 移动端适配保持 ---------- */
@media (max-width: 1024px) {
  .section { padding: 64px 0; }
  .section-header { margin-bottom: 40px; }
  .section-header h2 { font-size: 1.8rem; }
  .hero h1 { font-size: 2.4rem; }
  .page-hero h1 { font-size: 2rem; }
  .hero { min-height: 480px; }
}

@media (max-width: 768px) {
  .section { padding: 48px 0; }
  .section-header h2 { font-size: 1.5rem; }
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  .page-hero { padding: 72px 0 56px; }
  .page-hero h1 { font-size: 1.7rem; }
  .btn { padding: 12px 24px; font-size: 0.85rem; }
  .stat-number { font-size: 2.2rem; }
}

/* ---------- Print ---------- */
@media print {
  .site-header, .site-footer, .back-to-top, .hero-actions {
    display: none;
  }
  body { font-size: 12pt; }
  .section { padding: 1rem 0; }
}

/* ============================================================
   Header 重构 V3 — 参考 Nepal Economic Forum 一行式布局
   只改公共头部组件，保持蓝色品牌主题，不动文案/路由/语言按钮
   ============================================================ */

/* ---------- Header 容器：一行式水平布局 ---------- */
.site-header {
  height: 72px;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(10, 46, 92, 0.06);
  border-bottom: none;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: nowrap;
  height: 72px;
  padding: 0 24px;
}

/* ---------- Logo：图标 + 学院名称同一行 ---------- */
.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  text-decoration: none;
}

.site-logo img {
  height: 42px;
  width: auto;
  flex-shrink: 0;
}

/* logo 文字区：主名 + 副名水平并排，不再垂直堆叠 */
.site-logo .logo-text {
  display: flex;
  align-items: center;
  flex-direction: row;
  gap: 10px;
  line-height: 1;
  white-space: nowrap;
}

.site-logo .logo-main {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.01em;
}

.site-logo .logo-sub {
  font-size: 0.58rem;
  font-weight: 600;
  color: var(--color-text-light);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding-left: 10px;
  border-left: 1px solid var(--color-border);
}

/* 英文版：主名较长时，副标题缩小并控制宽度 */
html[lang="en"] .site-logo .logo-main {
  font-size: 0.92rem;
}

html[lang="en"] .site-logo .logo-sub {
  font-size: 0.5rem;
  letter-spacing: 0.05em;
}

/* ---------- 导航：横向排布、靠右、间距加大 ---------- */
.main-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  flex: 1;
  flex-wrap: nowrap;
  margin: 0 12px;
}

.nav-item {
  position: relative;
  flex-shrink: 0;
}

.nav-link {
  display: block;
  padding: 8px 14px;
  font-size: 0.82rem;
  font-weight: 500;
  color: #2c2c3a;
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.25s ease;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

/* hover 悬浮高亮：背景淡蓝 + 文字品牌蓝 */
.nav-link:hover {
  color: var(--color-primary);
  background: rgba(74, 90, 255, 0.08);
}

/* active 当前页：品牌蓝文字 + 下划线 */
.nav-link.active {
  color: var(--color-primary);
  font-weight: 600;
  background: transparent;
  position: relative;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 14px;
  right: 14px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-gold));
  border-radius: 2px;
}

/* ---------- 下拉菜单（学位项目）美化 ---------- */
.nav-item.has-dropdown .nav-link::after {
  content: '';
  display: inline-block;
  margin-left: 6px;
  width: 6px;
  height: 6px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  vertical-align: middle;
  transition: transform 0.25s ease;
  opacity: 0.7;
}

.nav-item.has-dropdown:hover .nav-link::after {
  transform: rotate(225deg) translateY(1px);
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  min-width: 280px;
  background: #ffffff;
  border: 1px solid rgba(74, 90, 255, 0.1);
  border-radius: 12px;
  box-shadow: 0 16px 48px rgba(10, 46, 92, 0.14);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1000;
}

/* 下拉菜单小箭头 */
.dropdown-menu::before {
  content: '';
  position: absolute;
  top: -6px;
  left: 36px;
  width: 12px;
  height: 12px;
  background: #ffffff;
  border-left: 1px solid rgba(74, 90, 255, 0.1);
  border-top: 1px solid rgba(74, 90, 255, 0.1);
  transform: rotate(45deg);
}

.nav-item.has-dropdown:hover .dropdown-menu,
.nav-item.has-dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 16px;
  font-size: 0.86rem;
  color: #3a3a4a;
  text-decoration: none;
  border-radius: 8px;
  transition: all 0.2s ease;
}

.dropdown-item::before {
  content: '';
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-gold);
  flex-shrink: 0;
}

.dropdown-item:hover {
  background: rgba(74, 90, 255, 0.07);
  color: var(--color-primary);
  padding-left: 20px;
}

/* ---------- 右侧操作区：语言切换 + 汉堡按钮 ---------- */
.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  margin-left: 8px;
}

/* 语言切换按钮 */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  background: rgba(74, 90, 255, 0.06);
  border-radius: 8px;
  border: 1px solid rgba(74, 90, 255, 0.1);
}

.lang-btn {
  padding: 6px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--color-text-light);
  background: transparent;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.lang-btn:hover {
  color: var(--color-primary);
}

.lang-btn.active {
  color: #ffffff;
  background: var(--color-primary);
  box-shadow: 0 2px 8px rgba(74, 90, 255, 0.3);
}

/* 汉堡按钮（桌面端隐藏，移动端显示） */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  background: rgba(74, 90, 255, 0.06);
  border: 1px solid rgba(74, 90, 255, 0.1);
  border-radius: 8px;
  cursor: pointer;
  padding: 0;
}

.mobile-menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.mobile-menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-menu-toggle.open span:nth-child(2) { opacity: 0; }
.mobile-menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 移动端折叠适配 ---------- */
@media (max-width: 1024px) {
  .site-header { height: 64px; }
  .header-inner { height: 64px; padding: 0 16px; gap: 12px; }

  /* Logo 缩小 */
  .site-logo img { height: 36px; }
  .site-logo .logo-main { font-size: 0.92rem; }
  .site-logo .logo-sub { display: none; }

  /* 导航折叠为汉堡菜单 */
  .main-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #ffffff;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px;
    gap: 4px;
    box-shadow: 0 16px 48px rgba(10, 46, 92, 0.14);
    border-top: 1px solid rgba(74, 90, 255, 0.08);
    max-height: calc(100vh - 64px);
    overflow-y: auto;
    z-index: 999;
    margin: 0;
  }

  .main-nav.open { display: flex; }

  .main-nav .nav-item { width: 100%; }
  .main-nav .nav-link {
    padding: 13px 16px;
    font-size: 0.95rem;
    border-radius: 8px;
  }
  .main-nav .nav-link.active::after { display: none; }
  .main-nav .nav-link.active { background: rgba(74, 90, 255, 0.08); }

  /* 下拉子菜单在移动端展开 */
  .nav-item.has-dropdown .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding: 4px 0 4px 16px;
    display: none;
    min-width: auto;
  }
  .nav-item.has-dropdown.open .dropdown-menu { display: block; }
  .nav-item.has-dropdown.open .dropdown-menu::before { display: none; }

  /* 语言切换 + 汉堡 */
  .header-actions { gap: 6px; margin-left: auto; }
  .lang-switcher { gap: 1px; padding: 3px; }
  .lang-btn { padding: 5px 10px; font-size: 0.75rem; }
  .mobile-menu-toggle { display: flex; }
}

@media (max-width: 480px) {
  .site-logo .logo-main { font-size: 0.8rem; }
  .header-inner { padding: 0 12px; }
  .lang-btn { padding: 5px 8px; font-size: 0.72rem; }
}