cfc/web/css/style.css

/* ============================================================
   亿图腾 · 浠艾福 — 企业官网样式表
   设计系统基于 DESIGN.md 设计 Token
   ============================================================ */

/* ----------------------------------------------------------
   0. CSS Custom Properties (Design Tokens)
   ---------------------------------------------------------- */
:root {
  /* Brand Colors (from logo sky-blue palette) */
  --color-primary: #4A9BD7;
  --color-primary-hover: #3993CC;
  --color-primary-light: #E8F4FA;
  --color-secondary: #4ECDC4;
  --color-accent: #FFD93D;
  --color-accent-light: #FFFBEB;

  /* Text Colors */
  --color-text-primary: #2D3436;
  --color-text-secondary: #636E72;
  --color-text-muted: #B2BEC3;

  /* Surfaces */
  --bg-body: #F5FAFE;
  --bg-surface: #FFFFFF;
  --bg-section-alt: #EEF5FB;

  /* Other UI */
  --color-border: #D8E5F0;
  --color-border-light: #E5EEF5;
  --shadow-sm: 0 1px 3px rgba(45, 52, 54, .08);
  --shadow-md: 0 4px 12px rgba(45, 52, 54, .10);
  --shadow-lg: 0 12px 40px rgba(45, 52, 54, .12);
  --shadow-xl: 0 24px 60px rgba(45, 52, 54, .15);

  /* Typography */
  --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --font-size-display: clamp(2.25rem, 5vw, 3.5rem);
  --font-size-h1: clamp(1.75rem, 4vw, 2.5rem);
  --font-size-h2: clamp(1.5rem, 3vw, 2.25rem);
  --font-size-h3: 1.25rem;
  --font-size-body: 1rem;
  --font-size-small: .875rem;
  --font-size-tiny: .75rem;

  /* Spacing */
  --space-xs: .5rem;
  --space-sm: .75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-section: 5rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: .2s ease;
  --transition-normal: .3s ease;
  --transition-slow: .5s cubic-bezier(.4, 0, .2, 1);

  /* Layout */
  --max-width: 1200px;
  --header-height: 64px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: var(--header-height);
  scroll-snap-type: y mandatory;
}

/* All major sections snap to top when scrolling stops */
section[id] {
  scroll-snap-align: start;
  scroll-snap-stop: always;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--bg-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ----------------------------------------------------------
   2. Container
   ---------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

/* ----------------------------------------------------------
   3. Header / Navigation
   ---------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(245, 250, 254, .92);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--color-border-light);
  z-index: 1000;
  transition: box-shadow var(--transition-normal);
}

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 700;
  font-size: 1.125rem;
}

.logo-icon { font-size: 1.5rem; }

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

.logo-tag {
  color: var(--color-primary);
  font-weight: 600;
}

/* Nav Toggle (Mobile) */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: var(--transition-fast);
  transform-origin: center;
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Nav List */
.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-link {
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: var(--space-xs) 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  transition: width var(--transition-normal);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Nav login button */
.nav-login-btn {
  display: inline-flex;
  align-items: center;
  padding: .5rem 1.125rem;
  font-size: var(--font-size-tiny);
  font-weight: 600;
  color: #fff;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  margin-left: var(--space-md);
  white-space: nowrap;
}

.nav-login-btn:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(74, 155, 215, .3);
}

/* ----------------------------------------------------------
   4. Section Shell
   ---------------------------------------------------------- */
.section {
  padding: var(--space-section) 0;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-3xl);
}

.section-tag {
  display: inline-block;
  font-size: var(--font-size-tiny);
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: .35em 1em;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

.section-title {
  font-size: var(--font-size-h1);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

.section-desc {
  font-size: var(--font-size-body);
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 600px;
  margin: 0 auto;
}

/* ----------------------------------------------------------
   5. Buttons
   ---------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: .75rem 1.75rem;
  font-family: var(--font-family);
  font-size: var(--font-size-small);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(74, 155, 215, .35);
}

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

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* Hero service provider link */
.hero-service-link {
  margin-top: var(--space-lg);
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.hero-service-link a {
  color: var(--color-primary);
  font-weight: 600;
  transition: color var(--transition-fast);
}

.hero-service-link a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* Role card login button */
.role-login-btn {
  display: inline-block;
  margin-top: var(--space-md);
  padding: .5rem 1.25rem;
  font-size: var(--font-size-tiny);
  font-weight: 600;
  color: #fff;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.role-login-btn:hover {
  background: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(74, 155, 215, .25);
}

.role-teacher .role-login-btn:hover {
  background: #3B82F6;
  box-shadow: 0 4px 12px rgba(59, 130, 246, .3);
}

.role-admin .role-login-btn:hover {
  background: #6366F1;
  box-shadow: 0 4px 12px rgba(99, 102, 241, .3);
}

/* ----------------------------------------------------------
   6. Hero Section
   ---------------------------------------------------------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: var(--header-height);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(74, 155, 215, .10), transparent),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(78, 205, 196, .08), transparent),
    radial-gradient(ellipse 50% 50% at 20% 70%, rgba(255, 217, 61, .06), transparent);
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  font-size: var(--font-size-tiny);
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: .4em 1.2em;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
}

.hero-title {
  font-size: var(--font-size-display);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: var(--space-lg);
}

.highlight {
  color: var(--color-primary);
}

.hero-desc {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-xl);
  max-width: 540px;
}

.hero-desc strong {
  color: var(--color-text-primary);
}

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

/* Hero Visual - Orbit Animation */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.dimension-orbit {
  position: relative;
  width: 320px;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.orbit-center {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 40px rgba(74, 155, 215, .3);
  position: relative;
  z-index: 2;
  animation: pulseCenter 3s ease-in-out infinite;
}

@keyframes pulseCenter {
  0%, 100% { box-shadow: 0 0 40px rgba(74, 155, 215, .3); transform: scale(1); }
  50% { box-shadow: 0 0 60px rgba(74, 155, 215, .5); transform: scale(1.05); }
}

.orbit-item {
  position: absolute;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 2px solid var(--color-border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-secondary);
  box-shadow: var(--shadow-sm);
  animation: orbit 12s linear infinite;
  animation-delay: calc(var(--i) * -2.4s);
  z-index: 1;
}

@keyframes orbit {
  0% {
    transform: rotate(0deg) translateX(130px) rotate(0deg);
  }
  100% {
    transform: rotate(360deg) translateX(130px) rotate(-360deg);
  }
}

.orbit-item:nth-child(2) { --i: 1; }
.orbit-item:nth-child(3) { --i: 2; }
.orbit-item:nth-child(4) { --i: 3; }
.orbit-item:nth-child(5) { --i: 4; }

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-text-muted);
  font-size: var(--font-size-tiny);
  animation: fadeInUp 1s ease 1s both;
}

.scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--color-text-muted);
  border-bottom: 2px solid var(--color-text-muted);
  transform: rotate(45deg);
  animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translateY(0); opacity: .5; }
  50% { transform: rotate(45deg) translateY(6px); opacity: 1; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateX(-50%) translateY(10px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ----------------------------------------------------------
   7. About Section
   ---------------------------------------------------------- */
.section-about {
  background: var(--bg-surface);
}

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

.about-card {
  background: var(--bg-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  text-align: center;
  transition: all var(--transition-normal);
}

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

.about-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-card h3 {
  font-size: var(--font-size-h3);
  margin-bottom: var(--space-sm);
  font-weight: 700;
}

.about-card p {
  color: var(--color-text-secondary);
  line-height: 1.7;
  font-size: var(--font-size-small);
}

/* ----------------------------------------------------------
   8. Product Section
   ---------------------------------------------------------- */
.section-product {
  background: linear-gradient(180deg, var(--bg-body) 0%, var(--color-primary-light) 100%);
}

.product-showcase {
  max-width: 800px;
  margin: 0 auto;
}

.product-quote {
  background: var(--bg-surface);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-xl) var(--space-2xl);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: var(--space-2xl);
  box-shadow: var(--shadow-sm);
}

.product-quote p {
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--color-text-secondary);
  font-style: italic;
}

.product-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.stat {
  text-align: center;
  padding: var(--space-lg);
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
}

.stat-num {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: var(--space-xs);
}

.stat-label {
  font-size: var(--font-size-tiny);
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* 幸福三支柱 */
.pillar-section {
  margin-top: var(--space-3xl);
  text-align: center;
}

.pillar-heading {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2xl);
  position: relative;
  display: inline-block;
}
.pillar-heading::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 2px;
  margin: var(--space-sm) auto 0;
}

.pillar-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  max-width: 960px;
  margin: 0 auto;
}

.pillar-card {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  border: 1px solid var(--color-border-light);
  transition: transform .3s ease, box-shadow .3s ease;
}
.pillar-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.pillar-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--pillar-bg, var(--color-primary-light));
  margin-bottom: var(--space-md);
}

.pillar-card h4 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--pillar-color, var(--color-primary));
  margin-bottom: var(--space-sm);
}

.pillar-card p {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

@media (max-width: 768px) {
  .pillar-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

/* ----------------------------------------------------------
    9. Core Products Section
   ---------------------------------------------------------- */
.section-products {
  background: linear-gradient(180deg, var(--color-primary-light) 0%, var(--bg-body) 100%);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
  max-width: 920px;
  margin: 0 auto;
}

.product-card {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--product-color, var(--color-primary));
}

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

.product-card-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--product-bg, var(--color-primary-light));
  margin-bottom: var(--space-md);
}

.product-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.product-card .product-sub {
  font-size: var(--font-size-small);
  color: var(--product-color, var(--color-primary));
  font-weight: 600;
  margin-bottom: var(--space-sm);
  margin-top: -4px;
}

.product-card > p {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-md);
}

.product-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.product-tags span {
  display: inline-block;
  padding: 2px 10px;
  font-size: var(--font-size-tiny);
  color: var(--product-color, var(--color-text-secondary));
  background: color-mix(in srgb, var(--product-color, var(--color-primary)) 10%, transparent);
  border-radius: 100px;
  font-weight: 500;
}

.product-plus {
  color: var(--product-color, var(--color-primary));
  font-weight: 700;
}

@media (max-width: 768px) {
  .products-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

/* ----------------------------------------------------------
    10. Dimensions Section
   ---------------------------------------------------------- */
.section-dimensions {
  background: var(--bg-surface);
}

.dimension-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-xl);
}

.dimension-grid > .dimension-card {
  width: calc((100% - var(--space-xl) * 2) / 3);
}

.dimension-card {
  background: var(--bg-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.dimension-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--dim-color);
  opacity: .6;
  transition: opacity var(--transition-normal);
}

.dimension-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.dimension-card:hover::before {
  opacity: 1;
}

.dim-title {
  font-size: var(--font-size-h3);
  font-weight: 700;
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.dim-emoji {
  font-size: 1.5rem;
}

.dim-desc {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.dim-points {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.dim-points li {
  font-size: var(--font-size-tiny);
  font-weight: 500;
  color: var(--dim-color);
  background: var(--dim-bg);
  padding: .3em .9em;
  border-radius: var(--radius-full);
}

/* Make 2 items in last row centered */
/* 5 items in 3-col grid: items 4 & 5 naturally wrap to row 2, cols 1 & 2 */

/* ----------------------------------------------------------
    11. Features Section
   ---------------------------------------------------------- */
.section-features {
  background: var(--bg-section-alt);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-normal);
  text-align: center;
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--fc) 10%, white);
  color: var(--fc);
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.feature-card p {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ----------------------------------------------------------
    12. AI Technology Section
   ---------------------------------------------------------- */
.section-ai-tech {
  background: linear-gradient(180deg, var(--bg-surface) 0%, var(--bg-section-alt) 100%);
}

.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  max-width: 1000px;
  margin: 0 auto;
}

.ai-card {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.ai-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--ai-color, var(--color-primary));
  opacity: .4;
  transition: opacity var(--transition-normal);
}

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

.ai-card:hover::before {
  opacity: 1;
}

.ai-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.ai-card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--ai-bg, var(--color-primary-light));
  flex-shrink: 0;
}

.ai-card-badge {
  display: inline-block;
  padding: 2px 10px;
  font-size: var(--font-size-tiny);
  font-weight: 600;
  color: var(--ai-color, var(--color-primary));
  background: color-mix(in srgb, var(--ai-color, var(--color-primary)) 10%, white);
  border-radius: 100px;
  white-space: nowrap;
}

.ai-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.ai-card p {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin: 0;
}

@media (max-width: 900px) {
  .ai-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .ai-grid {
    grid-template-columns: 1fr;
  }
}

/* ----------------------------------------------------------
    13. Roles Section
   ---------------------------------------------------------- */
.section-roles {
  background: var(--bg-surface);
}

.roles-flow {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: var(--space-xl);
  max-width: 960px;
  margin: 0 auto;
}

.role-card {
  flex: 1;
  background: var(--bg-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  position: relative;
  transition: all var(--transition-normal);
}

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

.role-badge {
  display: inline-block;
  font-size: var(--font-size-tiny);
  font-weight: 600;
  padding: .25em 1em;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

.role-parent .role-badge { background: var(--color-primary-light); color: var(--color-primary); }
.role-teacher .role-badge { background: #F0F7FF; color: #3B82F6; }
.role-admin .role-badge { background: #EEF0FF; color: #6366F1; }

.role-icon {
  margin-bottom: var(--space-md);
}

.role-card h3 {
  font-size: var(--font-size-h3);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.role-card > p {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.role-perms {
  text-align: left;
}

.role-perms li {
  font-size: var(--font-size-tiny);
  color: var(--color-text-secondary);
  padding: .35em 0;
  display: flex;
  align-items: flex-start;
  gap: var(--space-xs);
}


.role-perms li::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
  margin-top: 7px;
}

.role-teacher .role-perms li::before { background: #3B82F6; }
.role-admin .role-perms li::before { background: #6366F1; }

/* 客户角色 — 小程序二维码 */
.role-qr {
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}
.role-qr-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  border-radius: var(--radius-md);
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,.08);
  transition: transform .3s ease, box-shadow .3s ease;
  cursor: pointer;
}
.role-qr-code:hover {
  transform: scale(1.08);
  box-shadow: 0 4px 16px rgba(0,0,0,.12);
}
.role-qr-label {
  font-size: var(--font-size-tiny);
  color: var(--color-text-secondary);
  font-weight: 500;
  letter-spacing: .05em;
}

.roles-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-text-muted);
  font-size: var(--font-size-tiny);
  font-weight: 500;
  flex-shrink: 0;
  align-self: center;
}

.connector-arrow {
  width: 2px;
  height: 40px;
  background: var(--color-border);
  position: relative;
}

.connector-arrow::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--color-border);
}

/* ----------------------------------------------------------
    14. Contact Section
   ---------------------------------------------------------- */
.section-contact {
  background: linear-gradient(180deg, var(--bg-surface) 0%, var(--bg-body) 100%);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
  max-width: 800px;
  margin: 0 auto;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
}

.contact-item svg {
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-item strong {
  display: block;
  font-size: var(--font-size-tiny);
  color: var(--color-text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-bottom: 2px;
}

.contact-item span {
  font-weight: 600;
  color: var(--color-text-primary);
}

.contact-cta {
  text-align: center;
  padding: var(--space-2xl);
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
}

.contact-cta > p {
  font-size: var(--font-size-h3);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.cta-sub {
  font-size: var(--font-size-small) !important;
  font-weight: 400 !important;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl) !important;
}

.cta-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
}

.cta-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md);
  background: var(--bg-body);
  border-radius: var(--radius-md);
  font-size: var(--font-size-tiny);
  font-weight: 600;
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-fast);
}

.cta-card:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.cta-card-icon {
  font-size: 1.5rem;
}

.cta-card-desc {
  font-weight: 400;
  color: var(--color-text-muted);
  font-size: var(--font-size-tiny);
}

/* ----------------------------------------------------------
    15. Footer
   ---------------------------------------------------------- */
.site-footer {
  background: var(--color-text-primary);
  color: #fff;
  padding: var(--space-3xl) 0 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}

.footer-brand .logo-text {
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
}

.footer-brand .logo-tag {
  color: var(--color-primary);
  font-weight: 600;
  font-size: 1.25rem;
}

.footer-brand p {
  color: rgba(255, 255, 255, .6);
  font-size: var(--font-size-small);
  margin-top: var(--space-sm);
  max-width: 300px;
  line-height: 1.7;
}

.footer-links {
  display: flex;
  gap: var(--space-3xl);
}

.footer-col h4 {
  font-size: var(--font-size-tiny);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: rgba(255, 255, 255, .5);
  margin-bottom: var(--space-md);
}

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

.footer-col ul li a {
  font-size: var(--font-size-small);
  color: rgba(255, 255, 255, .7);
  transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  text-align: center;
  padding: var(--space-lg) 0;
}

.footer-bottom p {
  font-size: var(--font-size-tiny);
  color: rgba(255, 255, 255, .4);
}

/* ----------------------------------------------------------
    16. Scroll Animations (AOS-like)
   ---------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .6s ease, transform .6s cubic-bezier(.4, 0, .2, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ----------------------------------------------------------
    17. Responsive - Tablet
   ---------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    display: none;
  }

  .dimension-grid > .dimension-card {
    width: calc((100% - var(--space-xl)) / 2);
  }

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

  .roles-flow {
    gap: var(--space-md);
  }

  .role-card {
    padding: var(--space-lg) var(--space-md);
  }

  .roles-connector {
    flex-direction: row;
    gap: 0;
  }

  .connector-arrow {
    width: 40px;
    height: 2px;
  }

  .connector-arrow::after {
    top: 50%;
    left: auto;
    right: -4px;
    bottom: auto;
    transform: translateY(-50%);
    border: 5px solid transparent;
    border-left-color: var(--color-border);
    border-top-color: transparent;
  }

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

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

/* ----------------------------------------------------------
    18. Responsive - Mobile
   ---------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --space-section: 3.5rem;
    --header-height: 56px;
  }

  .container {
    padding: 0 var(--space-md);
  }

  /* Mobile Nav */
  .nav-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(255, 249, 240, .98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border-light);
    padding: var(--space-lg);
    transform: translateY(-110%);
    opacity: 0;
    transition: all var(--transition-normal);
    pointer-events: none;
  }

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

  .nav-list {
    flex-direction: column;
    gap: 0;
  }

  .nav-link {
    display: block;
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border-light);
    width: 100%;
  }

  .nav-link::after {
    display: none;
  }

  /* Hero */
  .hero-title {
    font-size: clamp(1.75rem, 7vw, 2.5rem);
  }

  .hero-desc {
    font-size: var(--font-size-small);
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }

  /* Grids */
  .about-grid {
    grid-template-columns: 1fr;
  }

  .dimension-grid > .dimension-card {
    width: 100%;
  }

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

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

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

  .cta-cards {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    gap: var(--space-xl);
  }

  .footer-links {
    gap: var(--space-xl);
  }

  .product-quote {
    padding: var(--space-md) var(--space-lg);
  }

  .product-quote p {
    font-size: var(--font-size-small);
  }

  .stat-num {
    font-size: 1.5rem;
  }

  /* Roles row — tighter spacing */
  .roles-flow {
    gap: var(--space-sm);
  }

  .role-card {
    padding: var(--space-md);
  }

  .role-card h3 {
    font-size: calc(var(--font-size-h3) * 0.85);
  }

  .role-perms li {
    font-size: calc(var(--font-size-tiny) * 0.9);
  }

  .role-qr-code {
    width: 64px;
    height: 64px;
  }

  .role-qr-code svg {
    width: 56px;
    height: 56px;
  }
}

@media (max-width: 480px) {
  .product-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  .stat {
    padding: var(--space-md);
  }

  .roles-flow {
    flex-direction: column;
    gap: var(--space-md);
  }

  .roles-connector {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .connector-arrow {
    width: 2px;
    height: 40px;
  }

  .connector-arrow::after {
    top: auto;
    left: 50%;
    right: auto;
    bottom: -4px;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: var(--color-border);
    border-left-color: transparent;
  }

  .footer-links {
    flex-direction: column;
    gap: var(--space-lg);
  }
}

/* ----------------------------------------------------------
    19. Logo
   ---------------------------------------------------------- */
.logo-img {
  display: block;
  flex-shrink: 0;
  border-radius: 8px;
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.footer-logo-img {
  display: block;
  flex-shrink: 0;
  border-radius: 10px;
  margin-bottom: var(--space-xs);
  object-fit: contain;
}

/* ----------------------------------------------------------
    20. Wuxing Philosophy Section
   ---------------------------------------------------------- */
.section-wuxing {
  background: linear-gradient(180deg, var(--bg-body) 0%, var(--bg-surface) 100%);
}

/* --- Diagram --- */
.wuxing-diagram {
  position: relative;
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1;
  margin: 0 auto var(--space-3xl);
}

.wuxing-diagram canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.wuxing-diagram .taiji-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 1;
  color: var(--color-text-secondary);
}

.wuxing-diagram .taiji-svg {
  display: block;
  animation: taiji-rotate 24s linear infinite;
}

@keyframes taiji-rotate {
  to { transform: rotate(360deg); }
}

/* --- Explanation Cards --- */
.wuxing-explanations {
  max-width: 960px;
  margin: 0 auto;
}

.we-section {
  margin-bottom: var(--space-2xl);
}

.we-section:last-child {
  margin-bottom: 0;
}

.we-title {
  font-size: var(--font-size-h3);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.we-sheng {
  color: var(--color-secondary);
}

.we-ke {
  color: var(--color-primary);
}

.we-subtitle {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.we-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-md);
}

.wuxing-card {
  background: var(--bg-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.wuxing-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--wc-color);
  opacity: .5;
  transition: opacity var(--transition-normal);
}

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

.wuxing-card:hover::before {
  opacity: 1;
}

.wc-arrow {
  display: inline-block;
  font-size: var(--font-size-tiny);
  font-weight: 700;
  color: var(--wc-color);
  padding: .15em .6em;
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--wc-color) 10%, white);
  margin-bottom: var(--space-sm);
}

.wuxing-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  color: var(--color-text-primary);
}

.wuxing-card p {
  font-size: var(--font-size-tiny);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

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

@media (max-width: 600px) {
  .we-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .we-grid {
    grid-template-columns: 1fr;
  }
}

/* Mobile: prevent dimension title wrapping */
@media (max-width: 600px) {
  .dim-title {
    font-size: 1rem;
    flex-wrap: wrap;
  }
  .dim-emoji {
    font-size: 1.2rem;
  }
  .dim-element {
    font-size: 9px;
  }
}



/* ----------------------------------------------------------
    21. Dimension Energy Tips
   ---------------------------------------------------------- */
.dim-energy {
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px dashed var(--color-border-light);
}

.dim-energy h4 {
  font-size: var(--font-size-small);
  font-weight: 700;
  color: var(--dim-color);
  margin-bottom: var(--space-sm);
}

.dim-energy ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.dim-energy ul li {
  font-size: var(--font-size-tiny);
  color: var(--color-text-secondary);
  padding: .25em 0;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.dim-energy ul li::before {
  content: '✦';
  color: var(--dim-color);
  font-size: 10px;
  flex-shrink: 0;
}

/* Dim element badge */
.dim-element {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  color: #fff;
  padding: .15em .6em;
  border-radius: var(--radius-full);
  margin-left: var(--space-xs);
  vertical-align: middle;
  letter-spacing: .04em;
  white-space: nowrap;
}

/* Prevent role name (家长/孩子/成长规划师) from breaking across lines */
.role-perms li strong {
  white-space: nowrap;
}

/* Responsive: Wuxing diagram — handled by aspect-ratio and Canvas redraw */
@media (max-width: 600px) {
  .wuxing-diagram {
    max-width: 360px;
  }
}