/* ============================================
   中国AI学习平板全栈解决方案商 - 官方网站
   全局样式系统 | Global Style System
   ============================================ */

/* =====================
   无障碍 / SEO 辅助类
   ===================== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary-600);
  color: #fff;
  padding: 8px 16px;
  z-index: 10000;
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

/* CSS 自定义属性 / Design Tokens */
:root {
  /* 主色系 - 科技蓝 */
  --primary-50: #eff6ff;
  --primary-100: #dbeafe;
  --primary-200: #bfdbfe;
  --primary-300: #93c5fd;
  --primary-400: #60a5fa;
  --primary-500: #3b82f6;
  --primary-600: #2563eb;
  --primary-700: #1d4ed8;
  --primary-800: #1e40af;
  --primary-900: #1e3a8a;

  /* 强调色 - 活力橙 */
  --accent-500: #f97316;
  --accent-600: #ea580c;

  /* 成功色 */
  --success-500: #22c55e;
  --success-600: #16a34a;

  /* 中性色 */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #06b6d4 100%);
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e3a8a 40%, #2563eb 100%);
  --gradient-accent: linear-gradient(135deg, #f97316 0%, #fb923c 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9) 0%, rgba(248,250,252,0.8) 100%);
  --gradient-dark: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);

  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.3);

  /* 字体 */
  --font-display: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* 间距 */
  --section-padding: 80px 0;
  --container-max: 1280px;
  --container-narrow: 900px;

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* 过渡 */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--gray-800);
  background-color: #fff;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* 容器系统 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.container--narrow {
  max-width: var(--container-narrow);
}

/* ===================== 
   排版系统
   ===================== */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--primary-50);
  color: var(--primary-600);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--gray-900);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.section-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--gray-500);
  max-width: 680px;
  line-height: 1.7;
}

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

.section-header .section-subtitle {
  margin-left: auto;
  margin-right: auto;
}

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* =====================
   按钮系统
   ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.15) 0%, transparent 100%);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:hover::before {
  opacity: 1;
}

.btn--primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.35);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.45);
}

.btn--secondary {
  background: #fff;
  color: var(--primary-700);
  border: 2px solid var(--primary-200);
}

.btn--secondary:hover {
  border-color: var(--primary-400);
  background: var(--primary-50);
  transform: translateY(-2px);
}

.btn--accent {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 15px rgba(249, 115, 22, 0.35);
}

.btn--accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(249, 115, 22, 0.45);
}

.btn--outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.4);
}

.btn--outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: #fff;
  transform: translateY(-2px);
}

.btn--lg {
  padding: 18px 40px;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn--sm {
  padding: 10px 20px;
  font-size: 0.875rem;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* =====================
   导航栏
   ===================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition-base);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 10px 0;
  box-shadow: 0 4px 30px rgba(0,0,0,0.15);
}

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

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
}

.navbar-brand .brand-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* 移动端菜单顶部栏 — 桌面端永远隐藏，避免JS克隆的logo暴露在页面中 */
.nav-mobile-header {
  display: none !important;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 16px;
  color: rgba(255,255,255,0.8);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.nav-link:hover,
.nav-link.active {
  color: #fff;
  background: rgba(255,255,255,0.1);
}

.nav-link .arrow {
  font-size: 0.7rem;
  transition: transform var(--transition-fast);
}

.nav-item:hover .arrow {
  transform: rotate(180deg);
}

/* Mega Menu 下拉菜单 */
.mega-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  min-width: 520px;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 100;
}

.nav-item:hover .mega-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.mega-menu-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.mega-menu-item {
  display: flex;
  gap: 12px;
  padding: 12px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.mega-menu-item:hover {
  background: var(--primary-50);
}

.mega-menu-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-100);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.mega-menu-info h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 2px;
}

.mega-menu-info p {
  font-size: 0.78rem;
  color: var(--gray-500);
  line-height: 1.4;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: 20px;
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  cursor: pointer;
  padding: 4px 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition-base);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* =====================
   Hero 首屏区域
   ===================== */
.hero {
  position: relative;
  min-height: auto;
  padding: 80px 0 48px;
  background: var(--gradient-hero);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg video,
.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.25;
}

.hero-particles {
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(2px 2px at 20px 30px, rgba(59,130,246,0.4), transparent),
    radial-gradient(2px 2px at 40px 70px, rgba(6,182,212,0.3), transparent),
    radial-gradient(1px 1px at 90px 40px, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 130px 80px, rgba(59,130,246,0.3), transparent),
    radial-gradient(2px 2px at 160px 30px, rgba(6,182,212,0.4), transparent);
  background-size: 200px 120px;
  animation: particleFloat 20s linear infinite;
}

@keyframes particleFloat {
  0% { transform: translateY(0); }
  100% { transform: translateY(-120px); }
}

.hero-grid-overlay {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(59,130,246,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,130,246,0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero .container {
  position: relative;
  z-index: 2;
  padding-top: 60px;
}

.hero-content {
  max-width:720px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-full);
  color: rgba(255,255,255,0.9);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 28px;
  backdrop-filter: blur(10px);
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}

.hero h1 {
  font-size: clamp(2.25rem, 5.5vw, 3.75rem);
  font-weight: 900;
  color: #fff;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, #60a5fa 0%, #38bdf8 50%, #34d399 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: rgba(255,255,255,0.7);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width:560px;
}

.hero-ctas {
  display: flex;
  flex-wrap: nowrap;
  gap: 12px;
  margin-bottom: 32px;
}

.hero-ctas .btn--lg {
  padding: 12px 24px;
  font-size: 0.925rem;
  white-space: nowrap;
}

.hero-stats {
  display: flex;
  gap: 48px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.12);
}

.hero-stat {
  text-align: left;
}

.hero-stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
}

.hero-stat-label {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
  margin-top: 2px;
}

/* Hero 右侧装饰 */
.hero-visual {
  position: absolute;
  right: -5%;
  top: 50%;
  transform: translateY(-50%);
  width: 480px;
  height: 480px;
  z-index: 1;
  opacity: 0.8;
}

.hero-device-mockup {
  width: 100%;
  height: 100%;
  position: relative;
}

.device-glow {
  position: absolute;
  inset: 20%;
  background: radial-gradient(circle, rgba(59,130,246,0.4) 0%, transparent 70%);
  filter: blur(40px);
  animation: glowPulse 4s ease-in-out infinite;
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.1); }
}

/* =====================
   通用 Section
   ===================== */
.section {
  padding: var(--section-padding);
  position: relative;
}

.section--dark {
  background: var(--gradient-dark);
  color: #fff;
}

.section--dark .section-title {
  color: #fff;
}

.section--dark .section-subtitle {
  color: rgba(255,255,255,0.6);
}

.section--light {
  background: var(--gray-50);
}

.section--white {
  background: #fff;
}

/* =====================
   数据指标区
   ===================== */
.stats-section {
  padding: 64px 0;
  background: var(--gradient-primary);
  position: relative;
  overflow: hidden;
}

.stats-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  position: relative;
  z-index: 1;
}

.stat-card {
  text-align: center;
  color: #fff;
  padding: 20px;
}

.stat-card-number {
  font-size: clamp(2.25rem, 4vw, 3.25rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-card-unit {
  font-size: 0.5em;
  font-weight: 600;
  opacity: 0.8;
}

.stat-card-label {
  font-size: 0.92rem;
  opacity: 0.85;
  font-weight: 500;
}

/* =====================
   业务矩阵卡片
   ===================== */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.solution-card {
  background: #fff;
  border-radius: var(--radius-xl);
  padding: 40px 32px;
  border: 1px solid var(--gray-200);
  transition: all var(--transition-slow);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.solution-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-slow);
  transform-origin: left;
}

.solution-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

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

.solution-card-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 24px;
  transition: transform var(--transition-base);
}

.solution-card:hover .solution-card-icon {
  transform: scale(1.1);
}

.solution-card-icon--blue { background: var(--primary-100); color: var(--primary-600); }
.solution-card-icon--orange { background: #fff7ed; color: var(--accent-600); }
.solution-card-icon--green { background: #f0fdf4; color: var(--success-600); }

.solution-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.solution-card p {
  font-size: 0.92rem;
  color: var(--gray-500);
  line-height: 1.65;
  margin-bottom: 24px;
}

.solution-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary-600);
  transition: gap var(--transition-fast);
}

.solution-card:hover .solution-card-link {
  gap: 10px;
}

/* =====================
   功能特性网格
   ===================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.feature-card {
  display: flex;
  gap: 20px;
  padding: 28px;
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-100);
  transition: all var(--transition-base);
}

.feature-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-200);
  transform: translateY(-2px);
}

.feature-icon {
  width: 52px;
  height: 52px;
  min-width: 52px;
  border-radius: var(--radius-md);
  background: var(--primary-50);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--primary-600);
}

.feature-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 8px;
}

.feature-content p {
  font-size: 0.88rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* =====================
   ROI 对比表格
   ===================== */
.roi-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  margin-top: 40px;
}

.roi-table {
  width: 100%;
  min-width: 700px;
  border-collapse: collapse;
  background: #fff;
}

.roi-table thead {
  background: var(--gradient-primary);
}

.roi-table thead th {
  padding: 18px 24px;
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
}

.roi-table thead th:first-child {
  border-radius: var(--radius-xl) 0 0 0;
}

.roi-table thead th:last-child {
  border-radius: 0 var(--radius-xl) 0 0;
}

.roi-table tbody td {
  padding: 18px 24px;
  font-size: 0.88rem;
  color: var(--gray-700);
  border-bottom: 1px solid var(--gray-100);
  vertical-align: top;
}

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

.roi-table tbody tr:hover {
  background: var(--primary-50);
}

.roi-table .dim-label {
  font-weight: 600;
  color: var(--gray-800);
  white-space: nowrap;
  min-width: 200px;
}

.roi-badge--bad {
  display: inline-block;
  padding: 4px 10px;
  background: #fef2f2;
  color: #dc2626;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
}

.roi-badge--good {
  display: inline-block;
  padding: 4px 10px;
  background: #f0fdf4;
  color: #16a34a;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
}

/* =====================
   扶政策列表
   ===================== */
.policy-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.policy-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition-base);
}

.policy-card:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.15);
  transform: translateY(-4px);
}

.policy-number {
  width: 36px;
  height: 36px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
}

.policy-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}

.policy-card p {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.65;
}

/* =====================
   技术架构展示
   ===================== */
.tech-showcase {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.tech-card {
  text-align: center;
  padding: 36px 24px;
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-100);
  transition: all var(--transition-base);
}

.tech-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--primary-200);
}

.tech-card-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  background: var(--primary-50);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--primary-600);
}

.tech-card h3 {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 10px;
}

.tech-card p {
  font-size: 0.84rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* =====================
   新闻动态
   ===================== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.news-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--gray-100);
  transition: all var(--transition-base);
}

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

.news-card-image {
  height: 200px;
  background: var(--gradient-primary);
  position: relative;
  overflow: hidden;
}

.news-card-image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  opacity: 0.6;
}

.news-card-body {
  padding: 24px;
}

.news-card-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--primary-50);
  color: var(--primary-600);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.news-card-date {
  font-size: 0.8rem;
  color: var(--gray-400);
  margin-bottom: 8px;
}

.news-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 10px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-card p {
  font-size: 0.86rem;
  color: var(--gray-500);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* =====================
   CTA 行动号召
   ===================== */
.cta-section {
  padding: 96px 0;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(59,130,246,0.3) 0%, transparent 70%);
  top: -200px;
  right: -100px;
  border-radius: 50%;
}

.cta-content {
  text-align: center;
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto;
}

.cta-content h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.cta-content p {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.7);
  margin-bottom: 36px;
  line-height: 1.7;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* =====================
   Footer
   ===================== */
.footer {
  background: #0a0f1c;
  color: rgba(255,255,255,0.7);
  padding: 72px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-bottom: 56px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand {
  max-width: 280px;
}

.footer-brand .navbar-brand {
  margin-bottom: 16px;
  color: #fff;
}

.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.5);
}

.footer-column h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  font-size: 0.86rem;
  color: rgba(255,255,255,0.5);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: #fff;
}

.footer-contact-item {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 0.86rem;
}

.footer-contact-item .icon {
  width: 18px;
  height: 18px;
  color: var(--primary-400);
  flex-shrink: 0;
  margin-top: 3px;
}

.footer-bottom {
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.35);
}

.footer-bottom-links {
  display: flex;
  gap: 24px;
}

.footer-bottom-links a {
  transition: color var(--transition-fast);
}

.footer-bottom-links a:hover {
  color: #fff;
}

/* =====================
   页面头部 (子页面)
   ===================== */
.page-hero {
  padding: 160px 0 80px;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  text-align: center;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

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

.page-hero h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 900;
  color: #fff;
  margin-bottom: 20px;
  letter-spacing: -0.03em;
}

.page-hero p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.65);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
}

/* 面包屑导航 */
.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 24px;
  font-size: 0.85rem;
}

.breadcrumb a {
  color: rgba(255,255,255,0.5);
  transition: color var(--transition-fast);
}

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

.breadcrumb .separator {
  color: rgba(255,255,255,0.3);
}

.breadcrumb .current {
  color: rgba(255,255,255,0.8);
}

/* =====================
   内容区块（子页面通用）
   ===================== */
.content-block {
  padding: 80px 0;
}

.content-block:nth-child(even) {
  background: var(--gray-50);
}

.content-block-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.content-block-grid.reverse {
  direction: rtl;
}

.content-block-grid.reverse > * {
  direction: ltr;
}

.content-block-visual {
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--gradient-primary);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  opacity: 0.8;
  min-height: 320px;
}

.content-block-text h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.content-block-text .text-lead {
  font-size: 1.05rem;
  color: var(--gray-500);
  line-height: 1.7;
  margin-bottom: 16px;
}

.content-block-text p {
  font-size: 0.94rem;
  color: var(--gray-600);
  line-height: 1.75;
  margin-bottom: 12px;
}

.content-block-text ul {
  list-style: none;
  margin: 20px 0;
}

.content-block-text ul li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--gray-600);
  margin-bottom: 10px;
  line-height: 1.6;
}

.content-block-text ul li .check-icon {
  width: 20px;
  height: 20px;
  min-width: 20px;
  background: var(--primary-100);
  color: var(--primary-600);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  margin-top: 2px;
}

/* 痛点卡片组 */
.pain-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 40px 0;
}

.pain-point-card {
  padding: 28px;
  background: #fff;
  border-radius: var(--radius-lg);
  border-left: 4px solid #ef4444;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base);
}

.pain-point-card:hover {
  transform: translateY(-4px);
}

.pain-point-card .icon {
  width: 44px;
  height: 44px;
  background: #fef2f2;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: #ef4444;
  margin-bottom: 14px;
}

.pain-point-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 8px;
}

.pain-point-card p {
  font-size: 0.85rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* 时间线 */
.timeline {
  position: relative;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--primary-200);
}

.timeline-item {
  position: relative;
  padding-bottom: 40px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -33px;
  top: 4px;
  width: 16px;
  height: 16px;
  background: var(--primary-600);
  border: 3px solid var(--primary-200);
  border-radius: 50%;
}

.timeline-item h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 8px;
}

.timeline-item p {
  font-size: 0.9rem;
  color: var(--gray-500);
  line-height: 1.65;
}

/* 团队成员 */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.team-card {
  text-align: center;
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--gray-100);
  transition: all var(--transition-base);
}

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

.team-avatar {
  width: 100%;
  aspect-ratio: 1;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  opacity: 0.7;
}

.team-card-body {
  padding: 20px;
}

.team-card-body h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 4px;
}

.team-card-body .role {
  font-size: 0.84rem;
  color: var(--primary-600);
  font-weight: 500;
  margin-bottom: 8px;
}

.team-card-body p {
  font-size: 0.82rem;
  color: var(--gray-400);
  line-height: 1.5;
}

/* FAQ 手风琴 */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--gray-200);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-800);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
}

.faq-question .icon {
  transition: transform var(--transition-base);
  font-size: 1.2rem;
  color: var(--primary-500);
}

.faq-item.active .faq-question .icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.faq-answer-inner {
  padding: 0 0 20px;
  font-size: 0.92rem;
  color: var(--gray-500);
  line-height: 1.7;
}

/* 表单样式 */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 8px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  transition: all var(--transition-fast);
  background: #fff;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary-400);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* 联系方式卡片 */
.contact-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.contact-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  border: 1px solid var(--gray-100);
  transition: all var(--transition-base);
}

.contact-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--primary-200);
}

.contact-card .card-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 18px;
  background: var(--primary-50);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary-600);
}

.contact-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 8px;
}

.contact-card p {
  font-size: 0.9rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* Tab 切换 */
.tabs {
  display: flex;
  gap: 4px;
  background: var(--gray-100);
  padding: 4px;
  border-radius: var(--radius-md);
  margin-bottom: 32px;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

.tab-btn {
  padding: 10px 24px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--gray-500);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn.active {
  background: #fff;
  color: var(--primary-600);
  box-shadow: var(--shadow-sm);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* 动画类 */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.slide-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* =====================
   客群分流导航区 (Persona Navigation)
   ===================== */
.persona-nav {
  background: #fff;
  border-bottom: 1px solid var(--gray-100);
  padding: 48px 0;
  position: relative;
  z-index: 5;
}

.persona-nav-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto;
}

.persona-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px 28px;
  background: var(--gray-50);
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.persona-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  border-radius: 2px;
  transition: all var(--transition-base);
}

.persona-card--training::before { background: var(--primary-500); }
.persona-card--studyroom::before { background: var(--accent-500); }
.persona-card--partner::before { background: var(--success-500); }

.persona-card:hover {
  background: #fff;
  border-color: var(--gray-200);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.persona-card--training:hover { border-color: var(--primary-200); }
.persona-card--studyroom:hover { border-color: #fed7aa; }
.persona-card--partner:hover { border-color: #bbf7d0; }

.persona-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.persona-card--training .persona-icon { background: var(--primary-50); color: var(--primary-600); }
.persona-card--studyroom .persona-icon { background: #fff7ed; color: var(--accent-600); }
.persona-card--partner .persona-icon { background: #f0fdf4; color: var(--success-600); }

.persona-info h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 4px;
}

.persona-info p {
  font-size: 0.82rem;
  color: var(--gray-500);
  line-height: 1.5;
}

.persona-info .persona-value {
  display: inline-block;
  margin-top: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: var(--radius-full);
}

.persona-card--training .persona-value { background: var(--primary-50); color: var(--primary-600); }
.persona-card--studyroom .persona-value { background: #fff7ed; color: var(--accent-600); }
.persona-card--partner .persona-value { background: #f0fdf4; color: var(--success-600); }

/* =====================
   信任背书区 (Trust Signals)
   ===================== */
.trust-section {
  padding: 48px 0;
  background: var(--gray-50);
  border-top: 1px solid var(--gray-100);
  border-bottom: 1px solid var(--gray-100);
}

.trust-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--gray-500);
  font-weight: 500;
}

.trust-item .trust-icon {
  width: 36px;
  height: 36px;
  background: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--primary-500);
  box-shadow: var(--shadow-sm);
}

.trust-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  opacity: 0.6;
  padding: 8px 0;
}

.trust-logo-item {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--gray-400);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

/* =====================
   社会证明 / 客户证言 (Social Proof)
   ==================== */
.testimonials-section {
  padding: 80px 0;
  background: #fff;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.testimonial-card {
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--gray-100);
  transition: all var(--transition-base);
  position: relative;
}

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

.testimonial-quote {
  font-size: 2.5rem;
  line-height: 1;
  color: var(--primary-200);
  margin-bottom: 12px;
  font-family: Georgia, serif;
}

.testimonial-text {
  font-size: 0.94rem;
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
}

.testimonial-author-info h5 {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--gray-800);
}

.testimonial-author-info span {
  font-size: 0.8rem;
  color: var(--gray-400);
}

/* =====================
   对比表格增强 (Comparison Table Enhanced)
   ===================== */
.comparison-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  margin: 40px 0;
  border: 1px solid var(--gray-200);
}

.comparison-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  background: #fff;
}

.comparison-table thead th {
  padding: 20px 24px;
  font-size: 0.88rem;
  font-weight: 700;
  text-align: center;
  white-space: nowrap;
  border-bottom: 2px solid var(--gray-200);
}

.comparison-table thead th:first-child {
  text-align: left;
  background: var(--gray-50);
  border-right: 1px solid var(--gray-200);
}

.comparison-table thead th.bad-header {
  background: #fef2f2;
  color: #dc2626;
}

.comparison-table thead th.good-header {
  background: #f0fdf4;
  color: #16a34a;
}

.comparison-table tbody td {
  padding: 18px 24px;
  font-size: 0.88rem;
  color: var(--gray-700);
  border-bottom: 1px solid var(--gray-100);
  vertical-align: middle;
  text-align: center;
}

.comparison-table tbody td:first-child {
  text-align: left;
  font-weight: 600;
  color: var(--gray-800);
  background: var(--gray-50);
  border-right: 1px solid var(--gray-200);
  white-space: nowrap;
  min-width: 220px;
}

.comparison-table tbody tr:hover td {
  background: rgba(59,130,246,0.03);
}

.comparison-table tbody tr:hover td:first-child {
  background: rgba(59,130,246,0.05);
}

.comparison-badge--bad {
  display: inline-block;
  padding: 4px 12px;
  background: linear-gradient(135deg, #fef2f2, #fee2e2);
  color: #dc2626;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
}

.comparison-badge--good {
  display: inline-block;
  padding: 4px 12px;
  background: linear-gradient(135deg, #f0fdf4, #dcfce7);
  color: #16a34a;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
}

/* =====================
   留资诱饵卡片 (Lead Magnet Cards)
   ===================== */
.lead-magnet-section {
  padding: 80px 0;
  background: var(--gradient-dark);
  color: #fff;
}

.lead-magnet-section .section-title {
  color: #fff;
}

.lead-magnet-section .section-subtitle {
  color: rgba(255,255,255,0.6);
}

.lead-magnets {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.lead-magnet-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.lead-magnet-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.lead-magnet-card:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.2);
  transform: translateY(-4px);
}

.lead-magnet-card:hover::after {
  transform: scaleX(1);
}

.lead-magnet-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--primary-300);
}

.lead-magnet-card h3 {
  font-size: 1.08rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}

.lead-magnet-card p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.6;
  margin-bottom: 20px;
}

.lead-magnet-card .btn {
  font-size: 0.85rem;
  padding: 10px 24px;
}

/* =====================
   场景展示卡 (Scenario Cards)
   ===================== */
.scenario-showcase {
  padding: 80px 0;
  background: var(--gray-50);
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.scenario-card {
  background: #fff;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--gray-100);
  transition: all var(--transition-base);
}

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

.scenario-image {
  height: 200px;
  background: var(--gradient-primary);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  opacity: 0.25;
}

.scenario-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  padding: 6px 14px;
  background: rgba(255,255,255,0.95);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary-600);
  backdrop-filter: blur(8px);
}

.scenario-body {
  padding: 28px;
}

.scenario-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
}

.scenario-body p {
  font-size: 0.88rem;
  color: var(--gray-500);
  line-height: 1.65;
  margin-bottom: 16px;
}

.scenario-benefits {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.scenario-benefits span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  background: var(--primary-50);
  color: var(--primary-700);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
}

/* =====================
   技术架构图示 (Tech Architecture)
   ===================== */
.architecture-diagram {
  padding: 60px;
  background: var(--gray-900);
  border-radius: var(--radius-xl);
  margin: 40px 0;
  position: relative;
  overflow: hidden;
}

.architecture-diagram::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 30%, rgba(59,130,246,0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(6,182,212,0.1) 0%, transparent 50%);
}

.arch-layers {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}

.arch-layer {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 28px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.arch-layer:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(59,130,246,0.3);
}

.arch-layer-num {
  width: 32px;
  height: 32px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
}

.arch-layer h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  flex: 1;
}

.arch-layer p {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.45);
  margin: 0;
}

/* =====================
   数字滚动动画
   ===================== */
.count-up {
  display: inline-block;
}

/* 回到顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-lg);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

/* =====================
   响应式设计 - Tablet (<=1024px)
   ===================== */
@media (max-width: 1024px) {
  :root {
    --section-padding: 64px 0;
  }

  /* 移动端遮罩层 */
  .nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.55);
    z-index: 998;
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
  }

  .nav-overlay.active {
    display: block;
  }

  .navbar-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(300px, 85vw);
    height: 100vh;
    max-height: 100vh;
    background: #0f172a;
    flex-direction: column;
    padding: 60px 16px 24px;
    transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: -10px 0 40px rgba(0,0,0,0.3);
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 999;
    -webkit-overflow-scrolling: touch;
  }

  .navbar-menu.open {
    right: 0;
  }

  /* 移动端菜单顶部栏（品牌 + 关闭按钮） — 仅移动端展开时显示 */
  .navbar-menu.open .nav-mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
    margin-bottom: 8px;
  }

  .nav-close {
    display: flex;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.1);
    border: none;
    border-radius: var(--radius-md);
    color: rgba(255,255,255,0.7);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
  }

  .nav-close:hover,
  .nav-close:active {
    background: rgba(255,255,255,0.2);
    color: #fff;
  }

  .navbar-nav {
    flex-direction: column;
    width: 100%;
    gap: 2px;
  }

  .nav-link {
    padding: 13px 14px;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  /* 展开状态下的 nav-link 高亮 */
  .nav-item.open > .nav-link {
    color: #fff;
    background: rgba(255,255,255,0.08);
  }

  .nav-item.open > .nav-link .arrow {
    transform: rotate(180deg);
  }

  .nav-item .mega-menu {
    position: static;
    transform: none !important;
    opacity: 1;
    visibility: visible;
    background: transparent;
    box-shadow: none;
    border: none;
    padding: 6px 8px 6px 16px;
    margin-top: 0;
    margin-bottom: 0;
    min-width: auto;
    display: none;
    overflow: hidden;
  }

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

  .mega-menu-grid {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .mega-menu-item {
    padding: 11px 12px;
    border-radius: var(--radius-sm);
    display: flex;
    gap: 10px;
    align-items: center;
    text-decoration: none;
    color: rgba(255,255,255,0.7) !important;
    transition: all var(--transition-fast);
  }

  .mega-menu-item:active {
    color: #fff !important;
    background: rgba(255,255,255,0.08);
  }

  .mega-menu-icon {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
  }

  .mega-menu-info h4 {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.9) !important;
    line-height: 1.3;
  }

  .mega-menu-info p {
    font-size: 0.73rem;
    color: rgba(255,255,255,0.45) !important;
    line-height: 1.4;
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  /* 移动端底部CTA按钮 */
  .nav-actions {
    display: flex;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    width: 100%;
  }

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

  .hero-visual {
    display: none;
  }

  .hero-content {
    max-width: 100%;
  }

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

  .solutions-grid {
    grid-template-columns: 1fr;
    max-width: 560px;
    margin: 0 auto;
  }

  /* 培训中心方案卡片 — 平板断点优化（support.html 数字化赋能型超级培训中心） */
  #support .solutions-grid {
    grid-template-columns: repeat(2, 1fr);
    max-width: none;
  }

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

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

  .policy-list {
    grid-template-columns: 1fr;
  }

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

  .content-block-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .content-block-grid.reverse {
    direction: ltr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

  .footer-brand {
    grid-column: 1 / -1;
    max-width: 100%;
  }

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

  .pain-points {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

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

  .persona-nav-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }

  .persona-card {
    padding: 18px 16px;
    flex-direction: column;
    text-align: center;
  }

  .persona-icon {
    margin: 0 auto;
  }

  .testimonials-grid {
    grid-template-columns: 1fr;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
  }

  .lead-magnets {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }

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

/* =====================
   响应式设计 - Mobile (<=640px)
   ===================== */
@media (max-width: 640px) {
  html {
    font-size: 15px;
  }

  :root {
    --section-padding: 56px 0;
  }

  .container {
    padding: 0 16px;
  }

  /* 小屏导航栏 */
  .navbar {
    padding: 12px 0;
  }

  .navbar-brand {
    font-size: 1.15rem;
  }

  .navbar-brand .brand-icon {
    width: 34px;
    height: 34px;
  }

  .navbar-menu {
    width: min(280px, 88vw);
    padding: 52px 14px 20px;
  }

  .nav-mobile-header {
    margin-bottom: 4px;
    padding-bottom: 8px;
  }

  .nav-close {
    width: 32px;
    height: 32px;
  }

  .nav-link {
    padding: 11px 12px;
    font-size: 0.9rem;
  }

  .mega-menu-item {
    padding: 10px 10px;
  }

  .mega-menu-icon {
    width: 32px;
    height: 32px;
  }

  .mega-menu-info h4 {
    font-size: 0.82rem;
  }

  .mega-menu-info p {
    font-size: 0.71rem;
  }

  .hero {
    min-height: auto;
    padding: 120px 0 80px;
  }

  .hero h1 {
    font-size: 2rem;
  }

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

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

  .hero-stats {
    flex-direction: column;
    gap: 20px;
  }

  .stat-card-number {
    font-size: 1.75rem;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .tech-showcase {
    grid-template-columns: 1fr;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

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

  .tabs {
    width: 100%;
    flex-wrap: wrap;
  }

  .tab-btn {
    flex: 1;
    text-align: center;
    padding: 8px 12px;
    font-size: 0.82rem;
  }

  /* 三大困境卡片移动端单列显示 */
  .pain-points {
    grid-template-columns: 1fr;
    gap: 16px;
    margin: 24px 0;
  }

  .pain-point-card {
    padding: 20px;
  }

  .pain-point-card .icon {
    width: 40px;
    height: 40px;
    margin-bottom: 12px;
  }

  .pain-point-card h3 {
    font-size: 0.95rem;
    margin-bottom: 8px;
  }

  .pain-point-card p {
    font-size: 0.82rem;
    line-height: 1.5;
  }

  .roi-table-wrapper {
    width: calc(100% + 32px);
    margin: 20px -16px;
    border-radius: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .roi-table {
    /* table natural width with scroll */
  }

  .comparison-table-wrapper {
    width: calc(100% + 32px);
    margin: 0 -16px;
    padding: 0 16px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .comparison-table {
    /* table natural width with scroll */
  }

  .hero-visual {
    width: 280px;
    height: 280px;
    position: relative;
    margin: 0 auto 24px;
    right: auto;
    top: auto;
    transform: none;
  }

  .hero-content {
    text-align: center;
    padding: 0 12px;
  }

  /* 防止页面整体溢出滚动 */
  html {
    overflow-x: hidden;
  }

  body {
    overflow-x: hidden;
  }

  /* 处理超长文本和代码块 */
  p, li, td, th, div {
    word-wrap: break-word;
    overflow-wrap: break-word;
  }

  pre, code {
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow-x: auto;
    max-width: 100%;
  }

  iframe, embed, object {
    max-width: 100%;
  }

  input, textarea, select {
    max-width: 100%;
  }

  .persona-nav-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .persona-card {
    padding: 16px 20px;
  }

  .trust-grid {
    gap: 20px;
  }

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

  .lead-magnets {
    grid-template-columns: 1fr;
  }

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

  .arch-layers {
    padding: 0;
  }

  .arch-layer {
    padding: 14px 16px;
    flex-wrap: wrap;
  }

  .page-hero {
    padding: 120px 0 56px;
  }

  .page-hero h1 {
    font-size: 1.65rem;
  }

  .cta-section {
    padding: 56px 0;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .solution-card {
    padding: 28px 20px;
  }

  /* 培训中心方案卡片 — 移动端单列 */
  #support .solutions-grid {
    grid-template-columns: 1fr;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }
}

/* =====================
   打印样式
   ===================== */
@media print {
  .navbar, .back-to-top, .hero-particles, .hero-grid-overlay {
    display: none !important;
  }

  body {
    color: #000;
    background: #fff;
  }

  .section {
    padding: 24px 0;
  }
}

/* ============================================
   工具类 — 从内联样式提取的高频复用类
   ============================================ */

/* 品牌图标白色 — 替代 18 处 style="color:#fff" */
.icon-brand { color: #fff; }

/* 列表项弹性布局 — 紧凑版（products 12处 + support 9处） */
.list-item-compact {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--gray-500);
  margin-bottom: 4px;
}
.list-item-compact:last-child { margin-bottom: 0; }

/* 列表项弹性布局 — 标准版（index 8处 + support 变体） */
.list-item-standard {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--gray-500);
  margin-bottom: 6px;
}
.list-item-standard:last-child { margin-bottom: 0; }

/* 列表项弹性布局 — 对比版（solution-study-room 10处） */
.list-item-compare {
  display: flex;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--gray-600);
  margin-bottom: 8px;
  line-height: 1.5;
}
.list-item-compare:last-child { margin-bottom: 0; }

/* 主题色 — section-label / check-icon 变体 */
.theme-green-light { background: #ecfdf5; color: #065f46; }
.theme-orange-light { background: #fff7ed; color: #c2410c; }
.theme-yellow-light { background: #fffbeb; color: #92400e; }
.theme-purple-light { background: #f5f3ff; color: #7c3aed; }
.theme-red-light { background: #fef2f2; color: #dc2626; }

/* 卡片顶部色条 */
.card-accent--green { border-top: 4px solid #16a34a; }
.card-accent--orange { border-top: 4px solid #f97316; }
.card-accent--purple { border-top: 4px solid #7c3aed; }
.card-accent--red { border-top: 4px solid #ea580c; }

/* 卡片图标颜色变体 */
.card-icon--green { background: #ecfdf5; color: #059669; }
.card-icon--orange { background: #fff7ed; color: #ea580c; }
.card-icon--purple { background: #f5f3ff; color: #7c3aed; }

/* check-icon 颜色变体 */
.check-icon--green { background: #ecfdf5; color: #065f46; }
.check-icon--yellow { background: #fffbeb; color: #92400e; }

/* 政策卡片白底（partner 8处） */
.policy-card-white {
  background: #fff;
  border: 1px solid var(--gray-100);
}
.policy-card-white h3 { color: var(--gray-900); }
.policy-card-white p { color: var(--gray-500); }
.policy-card-white .policy-number {
  background: linear-gradient(135deg, #059669, #34d399);
}

/* 社交媒体图标按钮（footer 6处） */
.social-btn {
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.6);
  transition: all var(--transition-fast);
}
.social-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  color: rgba(255, 255, 255, 0.9);
}

/* 社交按钮容器 */
.social-links {
  margin-top: 16px;
  display: flex;
  gap: 12px;
}

/* 表格辅助小字（solution-study-room 14处） */
.table-note {
  font-size: 0.78rem;
  color: var(--gray-400);
}

/* 辅助说明文字 */
.text-muted-sm { color: var(--gray-400); }
.text-muted { color: var(--gray-500); }
.text-strong { color: var(--gray-700); }
.text-heading { color: var(--gray-900); }

/* 白色区域 SVG 图标 */
.svg-icon-white-60 { color: rgba(255, 255, 255, 0.6); }
.svg-icon-white-50 { color: rgba(255, 255, 255, 0.5); }

/* Hero 区域 CTA 按钮容器 */
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-top: 32px;
  flex-wrap: wrap;
}

/* 渐变背景 — Hero 页面头部 */
.bg-hero-green { background: linear-gradient(135deg, #022c22, #065f46 40%, #059669 100%); }
.bg-hero-orange { background: linear-gradient(135deg, #1e0a04, #7c2d12 40%, #c2410c 100%); }
.bg-hero-purple { background: linear-gradient(135deg, #1e1b4b 0%, #4c1d95 50%, #7c3aed 100%); }
.bg-hero-dark { background: linear-gradient(135deg, #0f172a, #1e293b); }

/* 渐变背景 — 内容区块视觉图 */
.bg-visual-blue { background: linear-gradient(135deg, #1e3a8a, #2563eb, #3b82f6); }
.bg-visual-blue-cyan { background: linear-gradient(135deg, #1e3a8a, #2563eb, #06b6d4); }
.bg-visual-green { background: linear-gradient(135deg, #065f46, #059669, #34d399); }
.bg-visual-orange { background: linear-gradient(135deg, #92400e, #d97706, #fbbf24); }
.bg-visual-deep-orange { background: linear-gradient(135deg, #f97316, #ea580c, #c2410c); }

/* 渐变背景 — CTA 区域 */
.bg-cta-green { background: linear-gradient(135deg, #022c22 0%, #065f46 50%, #059669 100%); }
.bg-cta-orange { background: linear-gradient(135deg, #1e0a04 0%, #7c2d12 50%, #c2410c 100%); }

/* 渐变背景 — 按钮 */
.btn-gradient-green { background: linear-gradient(135deg, #059669, #34d399); }
.btn-gradient-purple { background: linear-gradient(135deg, #7c3aed, #a78bfa); }

/* 头像渐变 */
.avatar-green { background: linear-gradient(135deg, #059669, #34d399); }
.avatar-orange { background: linear-gradient(135deg, #ea580c, #f97316); }

/* 证言引号颜色 */
.quote-green { color: #bbf7d0; }
.quote-orange { color: #fed7aa; }

/* 居中容器（max-width:700px） */
.container-narrow {
  max-width: 700px;
  margin: 0 auto;
}

/* SLA 承诺框 */
.sla-box {
  text-align: center;
  margin-top: 32px;
  padding: 24px;
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* 方案卡片 padding 修正 */
.solution-card-padded { padding: 28px; }

/* news-card-tag 颜色变体 */
.tag-green { background: #ecfdf5; color: #065f46; }
.tag-yellow { background: #fffbeb; color: #92400e; }

/* pain-point-card 边框色 */
.border-left-green { border-left-color: #065f46; }

/* 内容区块额外边距 */
.mt-48 { margin-top: 48px; }

/* 底部小字链接样式 */
.cta-footnote {
  margin-top: 20px;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.4);
}

/* 白色强调文字 */
.text-white-strong { color: rgba(255, 255, 255, 0.95); }
.text-white-lg { color: #fff; font-size: 1.2em; }