/* ============================================
   七维教育官网 · 设计系统 (v4 - 移动端7屏黄金结构)
   ============================================ */

/* --- Design Tokens --- */
:root {
  --color-primary: #6BB5F0;
  --color-primary-dark: #4A9BE8;
  --color-primary-light: #A3D4F7;
  --color-deep-blue: #1B3A5C;
  --color-deep-blue-light: #2A4F7A;
  --color-bg-light: #F5F8FC;
  --color-bg-white: #FFFFFF;
  --color-text: #2D3748;
  --color-text-secondary: #64748B;
  --color-text-light: #94A3B8;
  --color-border: #E2E8F0;
  --color-hardware: #4A9BE8;
  --color-infotech: #48BB78;
  --color-ai: #805AD5;
  --color-success: #48BB78;
  --font-heading: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 30px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.07);
  --shadow-lg: 0 12px 36px rgba(0,0,0,0.09);
  --shadow-xl: 0 24px 60px rgba(0,0,0,0.12);
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --nav-height: 72px;
}

/* --- Reset & Base --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg-white);
  line-height: 1.7;
  overflow-x: hidden;
}
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-deep-blue);
}
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-primary-dark); }
img { max-width: 100%; height: auto; display: block; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-xl); }

/* --- Mobile Utility Classes --- */
.m-only { display: none !important; }

/* --- Scroll Reveal --- */
.reveal, .reveal-left, .reveal-right { opacity: 0; transition: opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1), transform 0.35s cubic-bezier(0.16, 1, 0.3, 1); }
.reveal { transform: translateY(30px); }
.reveal-left { transform: translateX(-40px); }
.reveal-right { transform: translateX(40px); }
.reveal.visible, .reveal-left.visible, .reveal-right.visible { opacity: 1; transform: translate(0); }

/* --- Section Common --- */
.section { padding: 7rem 0; }
.section-title {
  font-size: 2.6rem; text-align: center; margin-bottom: var(--space-lg);
  letter-spacing: -0.02em; line-height: 1.25;
}
.section-subtitle {
  text-align: center; color: var(--color-text-secondary); font-size: 1.1rem;
  max-width: 680px; margin: 0 auto var(--space-3xl); line-height: 1.9;
}
.sub-section-title { font-size: 1.35rem; color: var(--color-deep-blue); margin-bottom: var(--space-xl); padding-left: var(--space-md); border-left: 3px solid var(--color-primary); }

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-height); display: flex; align-items: center;
  transition: background var(--transition-base), box-shadow var(--transition-base);
  background: transparent;
}
.nav.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 12px rgba(0,0,0,0.06);
}
.nav .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.nav-logo { display: flex; align-items: center; gap: var(--space-sm); }
.nav-logo-img { width: 40px; height: 40px; object-fit: contain; border-radius: 6px; }
.nav-logo-text { font-family: var(--font-heading); font-size: 1.25rem; font-weight: 700; color: #fff; transition: color var(--transition-base); }
.nav.scrolled .nav-logo-text { color: var(--color-deep-blue); }
.nav-links { display: flex; align-items: center; gap: var(--space-xl); list-style: none; }
.nav-links a {
  font-size: 0.92rem; font-weight: 500; color: rgba(255,255,255,0.85);
  transition: color var(--transition-fast); position: relative;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0;
  width: 0; height: 2px; background: var(--color-primary);
  transition: width var(--transition-base); border-radius: 1px;
}
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav.scrolled .nav-links a { color: var(--color-text); }
.nav.scrolled .nav-links a:hover { color: var(--color-primary); }
.nav-links a:hover { color: #fff; }
.nav-cta-link {
  padding: 6px 18px !important;
  background: rgba(255,255,255,0.15) !important;
  border: 1px solid rgba(255,255,255,0.3); border-radius: 50px;
  backdrop-filter: blur(8px);
}
.nav-cta-link:hover { background: var(--color-primary) !important; }
.nav.scrolled .nav-cta-link { background: var(--color-primary) !important; color: #fff !important; border-color: var(--color-primary); }
.nav-cta-link::after { display: none !important; }
.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; padding: 4px; background: none; border: none;
}
.nav-toggle span { display: block; width: 24px; height: 2px; background: #fff; border-radius: 2px; transition: var(--transition-base); }
.nav.scrolled .nav-toggle span { background: var(--color-deep-blue); }

/* ============================================
   HERO (v3 — full-bleed image background)
   ============================================ */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  overflow: hidden; padding: calc(var(--nav-height) + 2rem) 0 2rem;
}
.hero-bg-image {
  position: absolute; inset: 0;
  background-image: url('assets/hero_classroom_cn-1536-v20260721.webp');
  background-size: cover; background-position: center 30%;
  filter: brightness(0.35);
  transform: scale(1.05);
}
@media (max-width: 768px) {
  .hero-bg-image { background-image: url('assets/hero_classroom_cn-960-v20260721.webp'); }
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(15,39,66,0.85) 0%, rgba(27,58,92,0.7) 50%, rgba(74,155,232,0.4) 100%);
}
.hero .container { position: relative; z-index: 2; }
.hero-content { max-width: 1000px; margin: 0 auto; text-align: center; display: flex; flex-direction: column; align-items: center; gap: 0; }

/* Hero Tags */
.hero-tags { display: flex; align-items: center; justify-content: center; gap: var(--space-sm); margin-bottom: var(--space-xl); flex-wrap: wrap; }
.hero-tag { font-size: 0.85rem; color: rgba(255,255,255,0.65); font-weight: 500; letter-spacing: 0.03em; }
.hero-tag-dot { width: 4px; height: 4px; border-radius: 50%; background: rgba(255,255,255,0.3); }

.hero-text { margin-bottom: var(--space-xl); }
.hero h1 { font-size: 4rem; font-weight: 800; color: #fff; line-height: 1.2; margin-bottom: var(--space-xl); letter-spacing: 0; }
.hero h1 .highlight {
  background: linear-gradient(135deg, var(--color-primary-light), #fff);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-desc { font-size: 1.25rem; color: rgba(255,255,255,0.55); line-height: 1.9; margin-bottom: var(--space-xl); letter-spacing: 0.15em; font-weight: 400; }

/* Fact line — credentials without button treatment */
.hero-facts {
  display: flex;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
  color: rgba(255,255,255,0.72);
}
.fact-pill {
  display: inline-flex;
  align-items: center;
  padding: 0 18px;
  font-size: 0.9rem;
  color: inherit;
  line-height: 1.5;
  position: relative;
}
.fact-pill + .fact-pill::before {
  content: '';
  position: absolute;
  left: 0;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(163,212,247,0.75);
}

/* Stats — bottom of hero */
.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg); width: 100%;
  padding: var(--space-xl) var(--space-lg);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(12px);
}
.stat-card {
  text-align: center; padding: var(--space-lg) var(--space-md);
  background: transparent; border: none;
  border-radius: 0;
  transition: all var(--transition-base);
  border-right: 1px solid rgba(255,255,255,0.08);
}
.stat-card:last-child { border-right: none; }
.stat-card:hover { transform: translateY(-2px); }
.stat-number { font-size: 2.6rem; font-weight: 800; color: #fff; line-height: 1; }
.stat-number .unit { font-size: 1.1rem; font-weight: 600; color: var(--color-primary-light); }
.stat-label { font-size: 0.92rem; color: rgba(255,255,255,0.5); margin-top: var(--space-xs); }

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}
.hero-cta {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  padding: 14px 36px; background: var(--color-primary); color: #fff;
  font-weight: 600; font-size: 1rem; border-radius: 50px;
  border: none; cursor: pointer; transition: all var(--transition-base);
  box-shadow: 0 4px 20px rgba(107, 181, 240, 0.4);
}
.hero-cta:hover {
  background: var(--color-primary-dark); transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(107, 181, 240, 0.5); color: #fff;
}
.hero-cta svg { transition: transform var(--transition-base); }
.hero-cta:hover svg { transform: translateY(3px); }

/* ============================================
   SOLUTIONS (v4 — infographic + detail cards)
   ============================================ */
.solutions { background: var(--color-bg-white); }

.solutions-infographic {
  max-width: 960px; margin: 0 auto var(--space-3xl);
  aspect-ratio: 16 / 9;
  background-position: center;
  background-size: contain;
  background-repeat: no-repeat;
  border-radius: var(--radius-xl); overflow: hidden;
  box-shadow: var(--shadow-lg);
}
@media (min-width: 769px) {
  .solutions-infographic { background-image: url('assets/solutions_infographic_v5-1600-v20260721.webp'); }
}

.solutions-details {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-lg);
}
.solution-detail-card {
  padding: var(--space-3xl) var(--space-2xl); background: var(--color-bg-light);
  border-radius: var(--radius-lg); border: 1px solid var(--color-border);
  transition: all var(--transition-base); position: relative;
  display: flex; flex-direction: column;
}
.solution-detail-card:hover {
  box-shadow: 0 16px 48px rgba(0,0,0,0.08);
  transform: translateY(-4px);
  border-color: rgba(107,181,240,0.25);
}
.solution-detail-number {
  font-size: 3.5rem; font-weight: 800; color: var(--color-primary);
  opacity: 0.1; line-height: 1; margin-bottom: var(--space-sm);
  font-family: var(--font-heading);
}
.solution-detail-card h3 { font-size: 1.05rem; color: var(--color-deep-blue); margin-bottom: var(--space-sm); }
.solution-detail-card p { font-size: 0.88rem; color: var(--color-text-secondary); line-height: 1.7; }

/* Mobile benefit (hidden on desktop) & detail button (visible on both) */
.mobile-benefit { display: none; }
.mobile-detail-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 14px;
  padding: 0;
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-base);
  letter-spacing: 0.02em;
}
.mobile-detail-btn:hover {
  color: var(--color-primary-dark);
  gap: 8px;
}

/* ============================================
   WHY-US (v3 — featured image card)
   ============================================ */
.why-us { background: var(--color-bg-light); }

.why-featured {
  display: grid; grid-template-columns: 1fr 1fr;
  border-radius: var(--radius-xl); overflow: hidden;
  background: var(--color-deep-blue); margin-bottom: var(--space-2xl);
  min-height: 380px;
}
.why-featured-image { position: relative; }
.why-featured-image img { width: 100%; height: 100%; object-fit: cover; }
.why-featured-image::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(to right, transparent 60%, var(--color-deep-blue) 100%);
}
.why-featured-text {
  padding: var(--space-3xl); display: flex; flex-direction: column; justify-content: center;
}
.why-featured-label {
  display: inline-block; width: fit-content;
  padding: 4px 14px; background: rgba(107,181,240,0.15);
  border: 1px solid rgba(107,181,240,0.25); border-radius: 50px;
  font-size: 0.78rem; font-weight: 600; color: var(--color-primary-light);
  margin-bottom: var(--space-lg); letter-spacing: 0.05em;
}
.why-featured h3 { font-size: 1.4rem; color: #fff; margin-bottom: var(--space-md); }
.why-featured p { font-size: 0.92rem; color: rgba(255,255,255,0.7); line-height: 1.8; margin-bottom: var(--space-sm); }
.why-featured strong { color: var(--color-primary-light); }
.why-featured-note { font-style: italic; color: rgba(255,255,255,0.4) !important; font-size: 0.85rem !important; margin-top: var(--space-md); }

.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-xl); margin-bottom: var(--space-2xl); }

.why-card {
  padding: var(--space-2xl); background: var(--color-bg-white);
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}
.why-card:hover {
  box-shadow: 0 16px 48px rgba(0,0,0,0.08);
  transform: translateY(-5px);
  border-color: rgba(107,181,240,0.2);
}
.why-card-icon { color: var(--color-primary); margin-bottom: var(--space-lg); }
.why-card h3 { font-size: 1.15rem; margin-bottom: var(--space-md); letter-spacing: -0.01em; }
.why-card p { font-size: 0.9rem; color: var(--color-text-secondary); line-height: 1.8; margin-bottom: var(--space-md); }
.why-card-footnote {
  display: block; font-size: 0.8rem; font-style: italic;
  padding-top: var(--space-md); border-top: 1px solid var(--color-border);
  color: var(--color-text-light);
}

/* Qualifications */
.qualifications { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-sm); }
.qual-item {
  padding: 8px 18px; background: var(--color-bg-white);
  border: 1px solid var(--color-border); border-radius: 50px;
  font-size: 0.82rem; font-weight: 500; color: var(--color-deep-blue);
  transition: all var(--transition-fast);
}
.qual-item:hover { border-color: var(--color-primary); box-shadow: var(--shadow-sm); }

/* ============================================
   PRODUCTS
   ============================================ */
.products-section { background: var(--color-bg-white); }

.products-visual {
  max-width: 800px; margin: 0 auto var(--space-3xl);
  border-radius: var(--radius-xl); overflow: hidden;
  box-shadow: var(--shadow-xl);
}
.products-visual img { width: 100%; display: block; }

.products-tabs {
  display: flex; justify-content: center; gap: var(--space-sm);
  margin-bottom: var(--space-2xl); flex-wrap: wrap;
}
.tab-btn {
  padding: 10px 24px; border: 1.5px solid var(--color-border);
  border-radius: 50px; background: var(--color-bg-light);
  font-size: 0.92rem; font-weight: 500; color: var(--color-text-secondary);
  cursor: pointer; transition: all var(--transition-fast); font-family: var(--font-heading);
}
.tab-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.tab-btn.active { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }

.tab-content { display: none; }
.tab-content.active { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.products-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
.product-card {
  padding: var(--space-xl); background: var(--color-bg-light);
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  transition: all var(--transition-base);
}
.product-card:hover { box-shadow: var(--shadow-md); border-color: var(--color-primary-light); transform: translateY(-3px); }
.product-header { display: flex; justify-content: space-between; align-items: flex-start; gap: var(--space-md); margin-bottom: var(--space-sm); }
.product-header h4 { font-size: 0.95rem; font-weight: 700; color: var(--color-deep-blue); }
.product-status {
  flex-shrink: 0; padding: 3px 12px; border-radius: 50px;
  font-size: 0.72rem; font-weight: 600; background: #E6FFE6; color: #22543D;
}
.product-desc { font-size: 0.85rem; color: var(--color-text-secondary); line-height: 1.7; }
.product-expert {
  display: flex; align-items: center; gap: var(--space-sm);
  margin-top: var(--space-md); padding-top: var(--space-md); border-top: 1px solid var(--color-border);
}
.product-expert-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 0.85rem; font-weight: 700; flex-shrink: 0;
}
.product-expert-name { font-size: 0.85rem; font-weight: 600; color: var(--color-deep-blue); }
/* Memorial frame for deceased experts */
.memorial {
  border: 2px solid #1a1a1a; padding: 1px 4px; display: inline;
}
.product-expert-title { font-size: 0.75rem; color: var(--color-text-secondary); }

/* AI Showcase */
.ai-showcase { max-width: 700px; margin: 0 auto; }
.ai-main {
  padding: var(--space-3xl); background: linear-gradient(135deg, #1B3A5C, #2A5A8C);
  border-radius: var(--radius-xl); color: #fff; text-align: center;
}
.ai-badge {
  display: inline-block; padding: 6px 18px;
  background: rgba(107,181,240,0.15); border: 1px solid rgba(107,181,240,0.25);
  border-radius: 50px; font-size: 0.82rem; font-weight: 600;
  color: var(--color-primary-light); margin-bottom: var(--space-lg); letter-spacing: 0.05em;
}
.ai-main h3 { font-size: 1.8rem; color: #fff; margin-bottom: var(--space-md); }
.ai-desc { font-size: 0.95rem; color: rgba(255,255,255,0.7); line-height: 1.8; margin-bottom: var(--space-2xl); }
.ai-stats-row { display: flex; justify-content: center; gap: var(--space-3xl); }
.ai-stat-number { display: block; font-size: 1.8rem; font-weight: 800; color: var(--color-primary-light); }
.ai-stat-label { font-size: 0.82rem; color: rgba(255,255,255,0.45); }

/* ============================================
   TRUST — EXPERTS & SCHOOLS
   ============================================ */
.trust-section { background: var(--color-bg-light); }

.experts-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-xl); margin-bottom: var(--space-2xl); }
.expert-card {
  background: #ffffff;
  padding: 32px 24px;
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.05), 0 4px 12px -6px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
  border: 1px solid rgba(226,232,240,0.8);
}
.expert-card:hover { 
  transform: translateY(-6px);
  box-shadow: 0 20px 40px -10px rgba(74, 155, 232, 0.1), 0 8px 16px -6px rgba(74, 155, 232, 0.1);
  border-color: rgba(74, 155, 232, 0.3);
}
.expert-avatar { 
  width: 72px; height: 72px; border-radius: 50%; 
  background: linear-gradient(135deg, var(--color-primary), var(--color-deep-blue)); 
  color: #fff; display: flex; align-items: center; justify-content: center; 
  font-size: 1.8rem; font-weight: 700; margin: 0 auto 20px auto; 
  box-shadow: 0 8px 16px -4px rgba(74,155,232,0.3);
}
.expert-photo {
  overflow: hidden;
  background: #fff;
}
.expert-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  display: block;
}
.expert-card h4 { font-size: 1.15rem; color: var(--color-deep-blue); margin-bottom: var(--space-xs); }
.expert-card .expert-school { font-size: 0.92rem; color: var(--color-text-secondary); margin-bottom: var(--space-md); line-height: 1.5; }
.expert-card .expert-products {
  font-size: 0.82rem; color: var(--color-primary-dark);
  padding: 6px 12px; background: rgba(107,181,240,0.08);
  border-radius: var(--radius-sm); display: inline-block;
}

/* Schools */
.schools-layout { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3xl); align-items: start; }
.schools-map-stats { text-align: center; margin-top: var(--space-xl); }
.schools-map-stats .big-number { font-size: 3.5rem; font-weight: 800; color: var(--color-primary); line-height: 1; }
.schools-map-stats .big-label { font-size: 1rem; color: var(--color-text-secondary); margin-top: var(--space-sm); }

.school-category {
  margin-bottom: var(--space-sm); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); background: var(--color-bg-white); overflow: hidden;
}
.school-category-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-md) var(--space-lg); cursor: pointer;
  transition: background var(--transition-fast); user-select: none;
}
.school-category-header:hover { background: rgba(107,181,240,0.04); }
.school-category-header h4 { font-size: 0.95rem; color: var(--color-deep-blue); }
.school-category-toggle { color: var(--color-text-light); transition: transform var(--transition-base); display: flex; }
.school-category.open .school-category-toggle { transform: rotate(180deg); }
.school-category-body { max-height: 0; overflow: hidden; transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1); }
.school-category.open .school-category-body { max-height: 500px; }
.school-list { padding: 0 var(--space-lg) var(--space-lg); display: flex; flex-wrap: wrap; gap: var(--space-xs); }
.school-tag {
  display: inline-block; padding: 4px 12px;
  background: var(--color-bg-light); border-radius: 50px;
  font-size: 0.78rem; color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}
.school-tag:hover { background: rgba(107,181,240,0.12); color: var(--color-primary-dark); }
.school-tag.more { color: var(--color-text-light); font-style: italic; }

/* ============================================
   TIMELINE
   ============================================ */
.story-section { background: var(--color-bg-white); }

.timeline { position: relative; max-width: 900px; margin: 0 auto; padding: var(--space-xl) 0; }
.timeline::before {
  content: ''; position: absolute; top: 0; bottom: 0; left: 50%; transform: translateX(-50%);
  width: 3px; border-radius: 2px;
  background: linear-gradient(to bottom,
    var(--color-hardware) 0%, var(--color-hardware) 35%,
    var(--color-infotech) 35%, var(--color-infotech) 60%,
    var(--color-ai) 60%, var(--color-ai) 100%);
}

.timeline-phase-label { position: relative; text-align: center; margin: var(--space-2xl) 0 var(--space-xl); z-index: 2; }
.timeline-phase-label span {
  display: inline-block; padding: 8px 24px; border-radius: 50px;
  font-size: 0.88rem; font-weight: 700; color: #fff; letter-spacing: 0.05em;
}
.timeline-phase-label.hardware span { background: var(--color-hardware); }
.timeline-phase-label.infotech span { background: var(--color-infotech); }
.timeline-phase-label.ai span { background: var(--color-ai); }

.timeline-item { position: relative; width: 50%; padding: 0 40px var(--space-2xl); }
.timeline-item.left { left: 0; text-align: right; padding-right: 50px; padding-left: 0; }
.timeline-item.right { left: 50%; padding-left: 50px; padding-right: 0; }
.timeline-dot {
  position: absolute; top: 6px; width: 16px; height: 16px;
  border-radius: 50%; border: 3px solid; background: #fff; z-index: 2;
}
.timeline-item.left .timeline-dot { right: -8px; }
.timeline-item.right .timeline-dot { left: -8px; }
.timeline-item.phase-hardware .timeline-dot { border-color: var(--color-hardware); }
.timeline-item.phase-infotech .timeline-dot { border-color: var(--color-infotech); }
.timeline-item.phase-ai .timeline-dot { border-color: var(--color-ai); }
.timeline-year { font-size: 1.3rem; font-weight: 800; margin-bottom: 4px; }
.timeline-item.phase-hardware .timeline-year { color: var(--color-hardware); }
.timeline-item.phase-infotech .timeline-year { color: var(--color-infotech); }
.timeline-item.phase-ai .timeline-year { color: var(--color-ai); }
.timeline-title { font-size: 1.2rem; font-weight: 700; color: var(--color-deep-blue); margin-bottom: 6px; }
.timeline-desc { font-size: 1rem; color: var(--color-text-secondary); line-height: 1.7; }

/* ============================================
   TIMELINE VISUAL
   ============================================ */
.timeline-visual {
  max-width: 1120px;
  margin: 0 auto var(--space-3xl);
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
}
.timeline-visual img { 
  width: 100%; 
  min-width: 760px;
  display: block; 
  margin: 0 auto;
}

/* ============================================
   CTA (with background image)
   ============================================ */
.cta-section {
  position: relative; padding: var(--space-4xl) 0; overflow: hidden;
}
.cta-bg-image {
  position: absolute; inset: 0;
  width: 100%; height: 100%; object-fit: cover; object-position: center;
  filter: brightness(0.25); transform: scale(1.05);
}
.cta-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(15,39,66,0.85), rgba(27,58,92,0.8));
}
.cta-section .container { position: relative; z-index: 2; }
.cta-card { text-align: center; color: #fff; }
.cta-card h2 { font-size: 2rem; color: #fff; margin-bottom: var(--space-lg); }
.cta-card > p { font-size: 1.05rem; color: rgba(255,255,255,0.6); line-height: 1.8; margin-bottom: var(--space-3xl); }
.cta-actions { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-xl); margin-bottom: var(--space-3xl); }
.cta-action-item {
  padding: var(--space-2xl);
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg); backdrop-filter: blur(12px);
  transition: all var(--transition-base);
}
.cta-action-item:hover { background: rgba(255,255,255,0.1); transform: translateY(-4px); }
.cta-action-icon { color: var(--color-primary-light); margin-bottom: var(--space-md); }
.cta-action-item h4 { font-size: 1.05rem; color: #fff; margin-bottom: var(--space-sm); }
.cta-action-item p { font-size: 0.88rem; color: rgba(255,255,255,0.45); }
.cta-contact { color: rgba(255,255,255,0.4); font-size: 0.92rem; }
.cta-contact a { color: var(--color-primary-light); }
.cta-contact strong { color: rgba(255,255,255,0.7); }

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: #0A1F36; color: rgba(255,255,255,0.7); padding: var(--space-3xl) 0 var(--space-xl);
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: var(--space-2xl); margin-bottom: var(--space-2xl); }
.footer-brand .nav-logo { margin-bottom: var(--space-lg); }
.footer-brand .nav-logo-text { color: #fff; }
.footer-brand p { font-size: 0.88rem; line-height: 1.8; color: rgba(255,255,255,0.45); }
.footer h4 { color: #fff; font-size: 0.95rem; margin-bottom: var(--space-lg); }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: var(--space-sm); }
.footer-links a { color: rgba(255,255,255,0.45); font-size: 0.88rem; transition: color var(--transition-fast); }
.footer-links a:hover { color: var(--color-primary-light); }
.footer-honors { display: flex; flex-direction: column; gap: var(--space-sm); }
.footer-honor { font-size: 0.82rem; color: rgba(255,255,255,0.45); padding-left: var(--space-md); border-left: 2px solid rgba(107,181,240,0.3); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08); padding-top: var(--space-xl);
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.82rem; color: rgba(255,255,255,0.3);
}
.footer-slogan { font-style: italic; }

/* ============================================
   MOAT NARRATIVE — Desktop horizontal layout
   ============================================ */
.mobile-moat {
  margin-top: var(--space-3xl);
  padding-top: var(--space-3xl);
  border-top: 1px solid var(--color-border);
}
.mobile-moat-title {
  font-size: 1.4rem;
  color: var(--color-deep-blue);
  text-align: center;
  margin-bottom: 6px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.mobile-moat-subtitle {
  text-align: center;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
}
.moat-steps {
  display: flex;
  align-items: stretch;
  gap: 0;
  justify-content: center;
}
.moat-step {
  flex: 1;
  max-width: 300px;
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}
.moat-step:hover {
  box-shadow: 0 12px 36px rgba(0,0,0,0.08);
  transform: translateY(-4px);
  border-color: rgba(107,181,240,0.2);
}
.moat-step-icon {
  font-size: 2.2rem;
  margin-bottom: var(--space-md);
  line-height: 1;
}
.moat-step h4 {
  font-size: 1.05rem;
  color: var(--color-deep-blue);
  margin-bottom: var(--space-sm);
  font-weight: 700;
}
.moat-step p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}
.moat-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-md);
  color: var(--color-primary);
}
.moat-arrow svg {
  transform: rotate(-90deg);
  opacity: 0.4;
}

/* ============================================
   RESPONSIVE — TABLET (≤1024px)
   ============================================ */
@media (max-width: 1024px) {
  .hero h1 { font-size: 2.5rem; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .solutions-details { grid-template-columns: 1fr; }
  .why-featured { grid-template-columns: 1fr; }
  .why-featured-image { max-height: 260px; }
  .why-featured-image::after { background: linear-gradient(to bottom, transparent 50%, var(--color-deep-blue) 100%); }
  .why-grid { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: 1fr; }
  .experts-grid { grid-template-columns: repeat(2, 1fr); }
  .schools-layout { grid-template-columns: 1fr; }
  .cta-actions { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-xl); }
}

/* ============================================
   RESPONSIVE — MOBILE 7-SCREEN GOLDEN STRUCTURE (≤768px)
   ============================================
   Screen 1: Hero (定位 + 背书 + CTA)
   Screen 2: Stats (数据信任)
   Screen 3-4: Solutions (核心收益)
   Screen 5: Why-Us (护城河)
   Screen 6: Trust (专家 + 学校)
   Screen 7: CTA (终极促单)
   ============================================ */
@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
  }

  /* --- Mobile Utilities --- */
  .m-only { display: block !important; }

  /* --- Global Mobile Rhythm: 64-80px breathing room --- */
  .container { padding: 0 20px; }
  .section { padding: 64px 0; }
  .section-title {
    font-size: 1.65rem;
    margin-bottom: 12px;
    letter-spacing: 0.02em;
    line-height: 1.35;
  }
  .section-subtitle {
    font-size: 0.88rem;
    margin-bottom: 32px;
    line-height: 1.7;
  }
  .sub-section-title {
    font-size: 1.1rem;
    margin-bottom: 20px;
  }

  /* ===== MOBILE NAV ===== */
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: var(--nav-height); left: 0; right: 0;
    background: rgba(255,255,255,0.98); backdrop-filter: blur(16px);
    padding: var(--space-xl); gap: var(--space-lg); box-shadow: var(--shadow-lg);
  }
  .nav-links.open a { color: var(--color-text) !important; font-size: 1rem; }
  .nav-links.open .nav-cta-link { background: var(--color-primary) !important; color: #fff !important; display: inline-block; text-align: center; }

  /* ===== SCREEN 1: HERO — 生死线 ===== */
  .hero {
    min-height: auto;
    padding: calc(var(--nav-height) + 40px) 0 32px;
  }
  .hero h1 {
    font-size: 1.75rem;
    letter-spacing: -0.01em;
    margin-bottom: 16px;
    line-height: 1.3;
  }
  .hero h1 br { display: none; }
  .hero-desc {
    font-size: 0.95rem;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
  }

  /* Only show 2 most important pills on mobile */
  .hero-facts { margin-bottom: 24px; }
  .fact-pill { font-size: 0.72rem; padding: 0 8px; }
  .fact-pill:nth-child(n+4) { display: none; }
  .fact-pill + .fact-pill::before { width: 3px; height: 3px; }

  /* CTA button: full-width, large touch target */
  .hero-actions { margin-bottom: 32px; }
  .hero-cta {
    padding: 14px 32px;
    font-size: 0.95rem;
    min-height: 48px;
    width: auto;
    max-width: 280px;
  }

  /* ===== SCREEN 2: STATS — 数据信任 ===== */
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    padding: 16px 12px;
    border-radius: 16px;
  }
  .stat-card {
    padding: 14px 8px;
    border-right: none;
    border-radius: 12px;
    background: rgba(255,255,255,0.04);
  }
  .stat-card:nth-child(odd) { border-right: 1px solid rgba(255,255,255,0.06); }
  .stat-card:nth-child(-n+2) { border-bottom: 1px solid rgba(255,255,255,0.06); }
  .stat-number { font-size: 1.8rem; }
  .stat-number .unit { font-size: 0.85rem; }
  .stat-label { font-size: 0.72rem; margin-top: 2px; }

  /* ===== SCREEN 3-4: SOLUTIONS — 核心收益 ===== */
  /* Hide the infographic image on mobile */
  .solutions-infographic { display: none; }

  /* Single column, card-like benefit layout */
  .solutions-details {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .solution-detail-card {
    padding: 24px 20px;
    border-radius: 16px;
  }
  .solution-detail-number {
    font-size: 2rem;
    margin-bottom: 4px;
  }
  .solution-detail-card h3 {
    font-size: 1rem;
    margin-bottom: 6px;
  }
  /* Hide the long desktop description on mobile */
  .solution-detail-card > p:not(.mobile-benefit) {
    display: none;
  }
  /* Show mobile benefit summary (1 line) */
  .solution-detail-card .mobile-benefit {
    display: block !important;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
  }
  /* Show "了解详情" button */
  .solution-detail-card .mobile-detail-btn {
    display: inline-flex !important;
    align-items: center;
    padding: 10px 20px;
    background: rgba(74,155,232,0.08);
    color: var(--color-primary-dark);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 50px;
    border: 1px solid rgba(74,155,232,0.15);
    transition: all var(--transition-fast);
    min-height: 44px;
    text-decoration: none;
  }
  .solution-detail-card .mobile-detail-btn:active {
    background: rgba(74,155,232,0.15);
    transform: scale(0.98);
  }

  /* ===== SCREEN 5: WHY-US — 护城河 ===== */
  /* Hide desktop why-us complex elements */
  .why-featured { display: none; }
  .why-grid { display: none; }
  .qualifications { display: none; }

  /* Show mobile moat narrative (override desktop horizontal to vertical) */
  .mobile-moat {
    margin-top: 8px;
    padding-top: 0;
    border-top: none;
  }
  .mobile-moat-title {
    font-size: 1.25rem;
    margin-bottom: 8px;
  }
  .mobile-moat-subtitle {
    font-size: 0.85rem;
    margin-bottom: 28px;
  }
  .moat-steps {
    flex-direction: column;
    align-items: center;
    gap: 0;
  }
  .moat-step {
    border-radius: 20px;
    padding: 24px 20px;
    width: 100%;
    max-width: none;
  }
  .moat-step-icon { font-size: 2rem; margin-bottom: 12px; }
  .moat-step h4 { font-size: 1rem; margin-bottom: 8px; }
  .moat-step p { font-size: 0.82rem; line-height: 1.6; }
  .moat-arrow {
    padding: 8px 0;
  }
  .moat-arrow svg {
    transform: rotate(0deg);
    opacity: 0.5;
  }

  /* ===== HIDE PRODUCTS & STORY ON MOBILE ===== */
  .products-section { display: none; }
  .story-section { display: none; }

  /* ===== SCREEN 6: TRUST — 专家阵列 + 学校Logo墙 ===== */
  /* Hide desktop expert grid and sub-section headers */
  .experts-grid { display: none; }
  .trust-section .sub-section-title { display: none; }

  /* Show mobile expert avatar strip */
  .mobile-expert-strip {
    display: flex !important;
    align-items: flex-start;
    gap: 12px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 8px 0 16px;
    margin-bottom: 48px;
    scrollbar-width: none;
  }
  .mobile-expert-strip::-webkit-scrollbar { display: none; }
  .expert-mini {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
    min-width: 72px;
  }
  .expert-mini img {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid rgba(74,155,232,0.2);
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
  }
  .expert-mini span {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--color-deep-blue);
    white-space: nowrap;
  }
  .expert-mini small {
    font-size: 0.65rem;
    color: var(--color-text-light);
    white-space: nowrap;
  }
  .expert-mini-more {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    min-width: 56px;
    height: 56px;
    border-radius: 50%;
    background: rgba(74,155,232,0.08);
    border: 2px dashed rgba(74,155,232,0.25);
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    text-align: center;
    line-height: 1.3;
  }

  /* Hide desktop schools layout */
  .schools-layout { display: none; }

  /* Show mobile school showcase */
  .mobile-school-showcase {
    display: block !important;
  }
  .school-showcase-header {
    text-align: center;
    margin-bottom: 24px;
  }
  .school-showcase-number {
    font-size: 4rem;
    font-weight: 900;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: 8px;
    font-family: var(--font-heading);
  }
  .school-showcase-number span {
    font-size: 2.4rem;
    color: var(--color-primary-dark);
  }
  .school-showcase-label {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
  }
  .school-showcase-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
  }
  .school-showcase-tag {
    display: inline-block;
    padding: 8px 14px;
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: 50px;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--color-text);
    white-space: nowrap;
    transition: all var(--transition-fast);
  }
  .school-showcase-tag:active {
    border-color: var(--color-primary);
    background: rgba(74,155,232,0.04);
  }
  .school-showcase-more {
    text-align: center;
    font-size: 0.78rem;
    color: var(--color-text-light);
    margin-top: 16px;
    font-style: italic;
  }

  /* ===== SCREEN 7: CTA — 终极促单 ===== */
  .cta-card h2 { font-size: 1.45rem; margin-bottom: 12px; }
  .cta-card > p {
    font-size: 0.88rem;
    margin-bottom: 28px;
    line-height: 1.7;
  }
  .cta-card > p br { display: none; }

  /* Hide desktop CTA elements on mobile */
  .cta-actions { display: none; }
  .cta-contact { display: none; }

  /* Show mobile CTA buttons */
  .mobile-cta-buttons {
    display: flex !important;
    flex-direction: column;
    align-items: center;
    gap: 20px;
  }
  .mobile-cta-phone {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    max-width: 320px;
    padding: 16px 24px;
    background: var(--color-primary);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    min-height: 52px;
    box-shadow: 0 6px 24px rgba(107,181,240,0.45);
    transition: all var(--transition-base);
    text-decoration: none;
  }
  .mobile-cta-phone:hover,
  .mobile-cta-phone:active {
    background: var(--color-primary-dark);
    color: #fff;
    transform: scale(0.98);
  }
  .mobile-cta-phone svg { flex-shrink: 0; }
  .mobile-cta-phone strong {
    color: #fff;
    font-weight: 700;
  }
  .mobile-cta-name {
    font-size: 0.82rem;
    color: rgba(255,255,255,0.45);
    margin: 0;
  }
  .mobile-cta-qr {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 16px;
    width: 100%;
    max-width: 320px;
  }
  .mobile-cta-qr-img {
    width: 64px;
    height: 64px;
    border-radius: 8px;
    flex-shrink: 0;
    object-fit: contain;
    background: #fff;
  }
  .mobile-cta-qr-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  .mobile-cta-qr-info strong {
    font-size: 0.9rem;
    color: #fff;
  }
  .mobile-cta-qr-info span {
    font-size: 0.75rem;
    color: rgba(255,255,255,0.4);
  }

  /* ===== FOOTER MOBILE ===== */
  .footer { padding: 32px 0 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; margin-bottom: 24px; }
  .footer-grid > div:nth-child(n+2) { display: none; }
  .footer-brand p { font-size: 0.82rem; }
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
    font-size: 0.75rem;
  }

  /* ===== CONTACT SIDEBAR MOBILE ===== */
  .contact-sidebar {
    position: fixed;
    top: 0; right: 0; bottom: auto;
    width: 85vw; max-width: 340px;
    height: 100vh; max-height: 100vh;
    border-radius: 0;
    transform: translateX(100%);
    opacity: 1;
    pointer-events: none;
    overflow-y: auto;
    overflow-x: hidden;
  }
  .contact-sidebar.visible {
    transform: translateX(0);
    pointer-events: auto;
  }
  .contact-sidebar-close { height: 28px; padding: 0 10px; }
  .contact-fab { display: flex; }
  .contact-qr-preview { display: none; }
}

/* ============================================
   RESPONSIVE — SMALL MOBILE (≤480px)
   ============================================ */
@media (max-width: 480px) {
  .hero h1 { font-size: 1.5rem; }
  .hero-cta { max-width: 100%; width: 100%; }
  .hero-stats { gap: 6px; padding: 12px 8px; }
  .stat-number { font-size: 1.5rem; }
  .stat-label { font-size: 0.68rem; }

  .section { padding: 56px 0; }
  .section-title { font-size: 1.4rem; }

  .solution-detail-card { padding: 20px 16px; }
  .moat-step { padding: 20px 16px; }

  .school-showcase-number { font-size: 3.2rem; }
  .school-showcase-tag { font-size: 0.72rem; padding: 6px 12px; }

  .mobile-cta-phone { font-size: 0.92rem; padding: 14px 20px; }
}

/* ============================================================
   SCHOOLS HORIZONTAL TABS — Redesigned (Desktop only)
   ============================================================ */
.schools-tabs-wrapper {
  width: 100%;
  min-width: 0;
}
.schools-tabs-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 0;
  border-bottom: 2px solid var(--color-border);
  width: 100%;
}
.schools-tab-btn {
  width: 100%;
  padding: 14px 10px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-light);
  cursor: pointer;
  transition: all 0.25s;
  font-family: var(--font-heading);
  position: relative;
  text-align: center;
  white-space: nowrap;
}
.schools-tab-btn.active {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-primary);
}
.schools-tab-btn:hover:not(.active) {
  color: var(--color-text);
}

.schools-tab-panels {
  background: transparent;
  max-height: 460px;
  overflow-y: auto;
  padding: var(--space-lg) 0 0;
  width: 100%;
}
.schools-tab-panel { display: none; }
.schools-tab-panel.active { display: block; }

/* School list — 2-column grid */
.school-list {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.school-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-bg-white);
  border-radius: 24px;
  border: 1px solid rgba(226,232,240,0.8);
  box-shadow: 0 4px 12px rgba(0,0,0,0.02);
  transition: all 0.2s;
  line-height: 1.4;
}

.school-tag::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
}
.school-tag:hover {
  background: #ffffff;
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-md);
  color: var(--color-primary-dark);
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  .schools-tabs-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .schools-tab-btn { padding: 10px 16px; font-size: 0.85rem; }
  .schools-tab-panels { max-height: 350px; padding: var(--space-sm) 0; }
  .schools-layout { grid-template-columns: 1fr; gap: var(--space-xl); }
  .schools-map { min-height: 300px; }
  .school-list { grid-template-columns: 1fr; }
}

/* ============================================================
   CONTACT FLOATING CARD (PC: bottom-right, Mobile: FAB+sidebar)
   ============================================================ */
.contact-sidebar {
  position: fixed;
  bottom: 24px; right: 24px;
  width: 220px;
  max-height: calc(100dvh - 112px);
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 40px rgba(0,0,0,0.1);
  z-index: 1000;
  transform: translateY(20px) translateX(24px);
  opacity: 0;
  pointer-events: none;
  transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
  display: flex;
  flex-direction: column;
  padding: 0;
  overflow-y: auto;
  overflow-x: visible;
  scrollbar-width: thin;
}
.contact-sidebar.visible {
  transform: none;
  opacity: 1;
  pointer-events: auto;
}
.contact-sidebar-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 30px;
  padding: 0 10px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: #fff;
  color: var(--color-text-secondary);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.contact-sidebar-close:hover {
  color: var(--color-primary-dark);
  border-color: var(--color-primary-light);
  background: rgba(107,181,240,0.08);
}

.contact-sidebar-inner {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.contact-sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-deep-blue);
  padding: 0 0 12px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  white-space: nowrap;
}
.contact-qr-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 5px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--color-border);
}
.contact-qr-card:last-child {
  border-bottom: none;
  padding-bottom: 0;
}
.contact-qr-card h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 3px;
}
.contact-qr-card p {
  font-size: 0.76rem;
  color: var(--color-text-light);
  margin: 0;
  line-height: 1.4;
}
.contact-qr-thumb {
  position: relative;
  outline: none;
}
.contact-qr-img {
  width: 116px; height: 116px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  object-fit: contain;
  background: #fff;
  border: 1px solid var(--color-border);
}
.contact-qr-preview {
  position: fixed;
  right: 300px;
  top: 50%;
  width: min(480px, calc(100vw - 340px), calc(100dvh - 48px));
  height: min(480px, calc(100vw - 340px), calc(100dvh - 48px));
  max-width: none;
  padding: 18px;
  border-radius: var(--radius-lg);
  object-fit: contain;
  background: #fff;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-xl);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-50%) scale(0.96);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 1002;
}
.contact-qr-card:hover .contact-qr-preview,
.contact-qr-thumb:focus .contact-qr-preview {
  opacity: 1;
  transform: translateY(-50%) scale(1);
}
.contact-overlay {
  position: fixed;
  inset: 0;
  z-index: 998;
  background: rgba(15,39,66,0.28);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}
.contact-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

/* Mobile FAB */
.contact-fab {
  display: none;
  position: fixed;
  bottom: 24px; right: 24px;
  z-index: 999;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 50px;
  padding: 12px 20px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(74,155,232,0.4);
  transition: all 0.3s;
  align-items: center;
  gap: 6px;
  font-family: var(--font-heading);
}
.contact-fab:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(74,155,232,0.5); }
.contact-fab svg { flex-shrink: 0; }
.contact-fab.visible { display: flex; }

@media (max-height: 760px) and (min-width: 769px) {
  .contact-sidebar {
    width: 190px;
    bottom: 16px;
    max-height: calc(100dvh - 80px);
  }
  .contact-sidebar-inner { padding: 16px; gap: 9px; }
  .contact-sidebar-header { padding-bottom: 9px; font-size: 1rem; }
  .contact-sidebar-close { height: 26px; padding: 0 8px; font-size: 0.72rem; }
  .contact-qr-card { gap: 4px; padding-bottom: 9px; }
  .contact-qr-img { width: 96px; height: 96px; }
  .contact-qr-card h4 { font-size: 0.86rem; }
  .contact-qr-card p { font-size: 0.7rem; }
}

@media (max-height: 640px) and (min-width: 769px) {
  .contact-qr-img { width: 82px; height: 82px; }
  .contact-qr-card p { display: none; }
}

/* --- Footer ICP link --- */
.footer-icp {
  color: var(--color-text-light);
  text-decoration: none;
  font-size: 0.82rem;
  transition: color var(--transition-fast);
}
.footer-icp:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}