/* Tailwind CSS 本地化 */
@import url('tailwind.min.css');

/* ========== CSS 变量 ========== */
:root {
  --color-primary: #3A7BD5;
  --color-primary-light: #4FACFE;
  --color-primary-dark: #0F1A2E;
  --color-bg: #FFFFFF;
  --color-bg-light: #F8FAFC;
  --color-bg-accent: #EEF3F9;
  --color-text: #0F1A2E;
  --color-text-secondary: #2D4059;
  --color-text-muted: #64748B;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;
  --color-border: #E2E8F0;
  --color-card-shadow: rgba(58, 123, 213, 0.08);
  --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --header-height: 72px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.1);
  --shadow-card: 0 4px 16px var(--color-card-shadow);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== 重置 ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ========== 导航栏 ========== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-height);
  z-index: 1000;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}
.site-header.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-primary);
}
.logo img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.nav-menu a {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  transition: var(--transition);
  white-space: nowrap;
}
.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-primary);
  background: var(--color-bg-accent);
}
.nav-cta {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary)) !important;
  color: #fff !important;
  padding: 0.55rem 1.5rem !important;
  border-radius: 50px !important;
  box-shadow: 0 4px 12px rgba(79, 172, 254, 0.3);
  transition: var(--transition) !important;
}
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 172, 254, 0.4) !important;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark)) !important;
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ========== Hero区 ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(160deg, #0F1A2E 0%, #1A3A5C 50%, #2A4A6C 100%);
  color: #fff;
  overflow: hidden;
  padding-top: var(--header-height);
}
.hero-canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  padding: 2rem;
}
.hero-badge {
  display: inline-block;
  background: rgba(79, 172, 254, 0.15);
  color: var(--color-primary-light);
  padding: 0.4rem 1.5rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid rgba(79, 172, 254, 0.3);
  margin-bottom: 1.5rem;
}
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.2rem;
}
.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--color-primary-light), #a8d8ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p {
  font-size: 1.2rem;
  color: rgba(255,255,255,0.8);
  max-width: 680px;
  margin: 0 auto 2rem;
}
.hero-stats {
  display: flex;
  gap: 3rem;
  justify-content: center;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}
.hero-stat .stat-number {
  font-size: 2.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary-light), #a8d8ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-stat .stat-label {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  margin-top: 0.3rem;
}
.hero-extras {
  display: flex;
  gap: 2rem;
  justify-content: center;
  margin-top: 2rem;
  flex-wrap: wrap;
}
.hero-extras span {
  color: rgba(255,255,255,0.7);
  font-size: 0.95rem;
  font-weight: 500;
}
.hero-extras i {
  color: var(--color-primary-light);
  margin-right: 6px;
}

/* ========== 通用区段 ========== */
.section {
  padding: 5rem 2rem;
}
.section-light { background: var(--color-bg-light); }
.section-accent { background: var(--color-bg-accent); }
.section-dark {
  background: linear-gradient(160deg, #0F1A2E, #1A3A5C);
  color: #fff;
}
.section-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 0.8rem;
  color: var(--color-text);
}
.section-dark .section-title { color: #fff; }
.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin-bottom: 3rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.section-dark .section-subtitle { color: rgba(255,255,255,0.7); }

/* 面包屑 */
.breadcrumb {
  padding: calc(var(--header-height) + 2rem) 2rem 0;
  max-width: 1200px;
  margin: 0 auto;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}
.breadcrumb a {
  color: var(--color-primary);
  transition: var(--transition);
}
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span { margin: 0 0.4rem; }

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  color: #fff;
  box-shadow: 0 4px 16px rgba(79, 172, 254, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(79, 172, 254, 0.4);
}
.btn-secondary {
  background: rgba(255,255,255,0.12);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover {
  background: var(--color-bg-accent);
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}
.btn-white {
  background: #fff;
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
}
.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ========== 卡片 ========== */
.card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(58, 123, 213, 0.15);
}
.card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(79,172,254,0.1), rgba(58,123,213,0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--color-primary);
  margin-bottom: 1.2rem;
}
.card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  color: var(--color-text);
}
.card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 1rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-primary);
  transition: var(--transition);
}
.card-link:hover { gap: 0.6rem; }

/* ========== 网格布局 ========== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }

/* ========== Footer ========== */
.site-footer {
  background: #0F1A2E;
  color: rgba(255,255,255,0.7);
  padding: 4rem 2rem 0;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
}
.footer-brand h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 1rem;
}
.footer-brand p {
  line-height: 1.7;
  margin-bottom: 1.5rem;
}
.footer-col h4 {
  font-size: 1.1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 1.2rem;
}
.footer-col ul li {
  margin-bottom: 0.6rem;
}
.footer-col a {
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}
.footer-col a:hover { color: var(--color-primary-light); }
.footer-contact p {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.8rem;
}
.footer-contact i {
  color: var(--color-primary-light);
  width: 20px;
}
.footer-social {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}
.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: rgba(255,255,255,0.7);
  transition: var(--transition);
}
.footer-social a:hover {
  background: var(--color-primary);
  color: #fff;
}
.copyright {
  margin-top: 3rem;
  padding: 1.5rem 0;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
}

/* ========== 入场动画 ========== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}
.animate-delay-1 { transition-delay: 0.1s; }
.animate-delay-2 { transition-delay: 0.2s; }
.animate-delay-3 { transition-delay: 0.3s; }
.animate-delay-4 { transition-delay: 0.4s; }

/* ========== CTA区域 ========== */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  padding: 5rem 2rem;
  text-align: center;
  color: #fff;
}
.cta-section h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1rem;
}
.cta-section p {
  font-size: 1.1rem;
  opacity: 0.85;
  margin-bottom: 2rem;
}

/* ========== 时间轴 ========== */
.timeline {
  position: relative;
  padding: 2rem 0;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--color-primary-light), var(--color-primary));
  transform: translateX(-50%);
  border-radius: 2px;
}
.timeline-item {
  display: flex;
  justify-content: flex-end;
  padding-right: calc(50% + 2rem);
  position: relative;
  margin-bottom: 3rem;
}
.timeline-item:nth-child(even) {
  justify-content: flex-start;
  padding-right: 0;
  padding-left: calc(50% + 2rem);
}
.timeline-dot {
  position: absolute;
  left: 50%;
  top: 1rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid #fff;
  box-shadow: 0 0 0 3px var(--color-primary-light);
  transform: translateX(-50%);
  z-index: 1;
}
.timeline-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
}
.timeline-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}
.timeline-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* ========== FAQ手风琴 ========== */
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 0.8rem;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.active {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary);
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 1.5rem;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  background: #fff;
  transition: var(--transition);
}
.faq-question:hover { color: var(--color-primary); }
.faq-question i {
  transition: transform 0.3s;
  color: var(--color-text-muted);
}
.faq-item.active .faq-question i { transform: rotate(180deg); color: var(--color-primary); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}
.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 1.5rem 1.2rem;
}
.faq-answer p {
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ========== 标签 ========== */
.tag {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 500;
  background: rgba(79,172,254,0.1);
  color: var(--color-primary);
}
.tag-success { background: rgba(16,185,129,0.1); color: var(--color-success); }

/* ========== 专家卡片 ========== */
.team-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
  transition: var(--transition);
}
.team-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(58, 123, 213, 0.15);
}
.team-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 1.2rem;
  border: 4px solid var(--color-bg-accent);
}
.team-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}
.team-card .team-title {
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.8rem;
}
.team-card .team-desc {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ========== 案例卡片 ========== */
.case-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
  transition: var(--transition);
  position: relative;
}
.case-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(58, 123, 213, 0.15);
}
.case-card .quote-icon {
  font-size: 2rem;
  color: var(--color-primary-light);
  opacity: 0.3;
  position: absolute;
  top: 1rem;
  right: 1.5rem;
}
.case-card .case-school {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}
.case-card .case-info {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0.8rem;
}
.case-card .case-testimonial {
  font-style: italic;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  border-left: 3px solid var(--color-primary-light);
  padding-left: 1rem;
  margin: 1rem 0;
}
.case-card .case-student {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text);
}

/* ========== 管理后台 ========== */
.admin-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: calc(var(--header-height) + 2rem) 2rem 3rem;
}
.admin-login {
  max-width: 420px;
  margin: 8rem auto;
  padding: 3rem;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}
.admin-login h2 {
  text-align: center;
  margin-bottom: 2rem;
  font-weight: 800;
  color: var(--color-primary);
}
.admin-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 0;
}
.admin-tab {
  padding: 0.8rem 1.5rem;
  font-weight: 600;
  color: var(--color-text-muted);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: var(--transition);
  cursor: pointer;
}
.admin-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}
.admin-form-group {
  margin-bottom: 1.2rem;
}
.admin-form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
  color: var(--color-text-secondary);
}
.admin-form-group input,
.admin-form-group textarea,
.admin-form-group select {
  width: 100%;
  padding: 0.7rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  transition: var(--transition);
  background: var(--color-bg-light);
}
.admin-form-group input:focus,
.admin-form-group textarea:focus,
.admin-form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(58, 123, 213, 0.1);
}
.admin-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.admin-table th {
  background: var(--color-bg-accent);
  padding: 0.8rem 1rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}
.admin-table td {
  padding: 0.8rem 1rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.9rem;
}
.admin-table tr:hover td { background: var(--color-bg-light); }
.ban-alert {
  background: #FEF2F2;
  border: 1px solid #FECACA;
  border-radius: var(--radius-sm);
  padding: 1rem;
  color: var(--color-danger);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  display: none;
}
.ban-alert.active { display: block; }

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .timeline::before { left: 1rem; }
  .timeline-item,
  .timeline-item:nth-child(even) {
    padding-left: 3rem;
    padding-right: 0;
    justify-content: flex-start;
  }
  .timeline-dot { left: 1rem; }
}
@media (max-width: 768px) {
  .section { padding: 3rem 1.2rem; }
  .hero { min-height: auto; padding: 6rem 1.2rem 3rem; }
  .hero h1 { font-size: 2rem; }
  .hero-stats { gap: 1.5rem; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }
  .nav-menu.open { display: flex; }
  .menu-toggle { display: flex; }
  .section-title { font-size: 1.6rem; }
  .admin-table { font-size: 0.8rem; }
  .admin-table th, .admin-table td { padding: 0.5rem; }
}