/* ============================================
   云信通短信平台 - 2025全新设计
   采用最新设计趋势：极简、大间距、流畅动画
   ============================================ */

:root {
  /* 主色调 - 明亮天蓝色系 */
  --primary-50: #f0f9ff;
  --primary-100: #e0f2fe;
  --primary-200: #bae6fd;
  --primary-300: #7dd3fc;
  --primary-400: #38bdf8;
  --primary-500: #0ea5e9;
  --primary-600: #0284c7;
  --primary-700: #0369a1;
  --primary-800: #075985;
  --primary-900: #0c4a6e;

  --primary: var(--primary-500);
  --primary-light: var(--primary-400);
  --primary-dark: var(--primary-600);

  /* 渐变色 - 明亮天蓝色渐变 */
  --gradient-primary: linear-gradient(135deg, #38bdf8 0%, #0ea5e9 50%, #0284c7 100%);
  --gradient-hero: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 50%, #bae6fd 100%);
  --gradient-text: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);

  /* 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;

  /* 语义色 */
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;

  /* 多彩强调色 */
  --accent-purple: #8b5cf6;
  --accent-pink: #ec4899;
  --accent-orange: #f97316;
  --accent-teal: #14b8a6;
  --accent-indigo: #6366f1;
  --accent-rose: #f43f5e;

  /* 多彩渐变 */
  --gradient-purple: linear-gradient(135deg, #a78bfa 0%, #8b5cf6 50%, #7c3aed 100%);
  --gradient-pink: linear-gradient(135deg, #f472b6 0%, #ec4899 50%, #db2777 100%);
  --gradient-orange: linear-gradient(135deg, #fb923c 0%, #f97316 50%, #ea580c 100%);
  --gradient-teal: linear-gradient(135deg, #2dd4bf 0%, #14b8a6 50%, #0d9488 100%);
  --gradient-indigo: linear-gradient(135deg, #818cf8 0%, #6366f1 50%, #4f46e5 100%);
  --gradient-green: linear-gradient(135deg, #4ade80 0%, #22c55e 50%, #16a34a 100%);

  /* 文本色 */
  --text-primary: var(--gray-800);
  --text-secondary: var(--gray-500);
  --text-tertiary: var(--gray-400);
  --text-inverse: #ffffff;

  /* 背景色 */
  --bg-primary: #ffffff;
  --bg-secondary: var(--gray-50);
  --bg-tertiary: var(--gray-100);
  --bg-dark: var(--gray-900);

  /* 边框 */
  --border-color: var(--gray-200);
  --border-radius: 12px;
  --border-radius-lg: 16px;
  --border-radius-xl: 24px;
  --border-radius-2xl: 32px;
  --border-radius-full: 9999px;

  /* 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-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-primary: 0 10px 40px -10px rgba(14, 165, 233, 0.4);

  /* 间距 - 紧凑版 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 2.5rem;
  --spacing-3xl: 3.5rem;

  /* 字体 */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Space Grotesk', var(--font-sans);

  /* 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);

  /* 容器 */
  --container-max: 1280px;
}

/* 深色模式 */
[data-theme="dark"] {
  --text-primary: var(--gray-50);
  --text-secondary: var(--gray-300);
  --text-tertiary: var(--gray-400);
  --bg-primary: var(--gray-900);
  --bg-secondary: var(--gray-800);
  --bg-tertiary: var(--gray-700);
  --border-color: var(--gray-700);
}

/* ============================================
   重置和基础样式
   ============================================ */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 64px;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection {
  background: var(--primary-200);
  color: var(--primary-900);
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: var(--border-radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gray-400);
}

/* ============================================
   工具类
   ============================================ */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-label {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--primary-50);
  color: var(--primary-600);
  border-radius: var(--border-radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.02em;
}

.section-description {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ============================================
   按钮系统
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  border: none;
  border-radius: var(--border-radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: currentColor;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:hover::before {
  opacity: 0.1;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-primary);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

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

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

[data-theme="dark"] .btn-ghost {
  color: rgba(255, 255, 255, 0.9);
}

.btn-ghost:hover {
  background: var(--bg-secondary);
}

[data-theme="dark"] .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 1);
}

.btn-large {
  padding: 1.125rem 2rem;
  font-size: 1.125rem;
}

.btn-block {
  width: 100%;
}

/* ============================================
   导航栏
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

[data-theme="dark"] .header {
  background: rgba(15, 23, 42, 0.95);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

[data-theme="dark"] .header.scrolled {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  background: rgba(15, 23, 42, 0.98);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg) 0 calc(var(--spacing-lg) * 4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: transform var(--transition-fast);
}

[data-theme="dark"] .nav-logo {
  color: rgba(255, 255, 255, 0.95);
}

.nav-logo:hover {
  transform: scale(1.05);
}

.logo-img {
  height: 48px;
  width: auto;
}

.logo-text {
  background: linear-gradient(135deg, #38bdf8 0%, #0ea5e9 50%, #0284c7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-link {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9375rem;
  padding: 0.5rem 0;
  position: relative;
  transition: color var(--transition-fast);
}

[data-theme="dark"] .nav-link {
  color: rgba(255, 255, 255, 0.9);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
}

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

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

.nav-dropdown {
  position: relative;
}

.dropdown-content {
  position: absolute;
  top: calc(100% + 1rem);
  left: 50%;
  transform: translateX(-50%) translateY(-10px);
  background: var(--bg-primary);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-lg);
  min-width: 280px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  border: 1px solid var(--border-color);
}

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

.dropdown-group {
  margin-bottom: var(--spacing-md);
}

.dropdown-group:last-child {
  margin-bottom: 0;
}

.dropdown-group h4 {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

.dropdown-group a {
  display: block;
  padding: 0.5rem 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  font-size: 0.9375rem;
}

.dropdown-group a:hover {
  background: var(--bg-secondary);
  color: var(--primary);
  transform: translateX(4px);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.theme-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

[data-theme="dark"] .theme-btn {
  border-color: rgba(255, 255, 255, 0.2);
  color: rgba(255, 255, 255, 0.9);
}

[data-theme="dark"] .theme-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
}

.theme-btn:hover {
  background: var(--bg-secondary);
  transform: rotate(180deg);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  width: 28px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  width: 100%;
  height: 3px;
  background: var(--text-primary);
  border-radius: var(--border-radius-full);
  transition: all var(--transition-base);
}

/* ============================================
   英雄区域
   ============================================ */
.hero {
  min-height: auto;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 100px 0 60px;
}

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

.hero-gradient {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  opacity: 0.1;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(56, 189, 248, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 189, 248, 0.08) 1px, transparent 1px);
  background-size: 50px 50px;
  opacity: 0.5;
}

.hero-particles {
  position: absolute;
  inset: 0;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--primary);
  border-radius: 50%;
  opacity: 0.5;
  animation: float 20s infinite;
}

.particle:nth-child(1) {
  left: 10%;
  top: 20%;
  animation-delay: 0s;
}

.particle:nth-child(2) {
  left: 80%;
  top: 40%;
  animation-delay: 2s;
}

.particle:nth-child(3) {
  left: 30%;
  top: 70%;
  animation-delay: 4s;
}

.particle:nth-child(4) {
  left: 60%;
  top: 10%;
  animation-delay: 6s;
}

.particle:nth-child(5) {
  left: 90%;
  top: 80%;
  animation-delay: 8s;
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0) translateX(0);
  }

  25% {
    transform: translateY(-20px) translateX(10px);
  }

  50% {
    transform: translateY(-40px) translateX(-10px);
  }

  75% {
    transform: translateY(-20px) translateX(5px);
  }
}

.hero-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--spacing-xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-radius: var(--border-radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .hero-badge {
  background: rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.badge-dot {
  width: 4px;
  height: 4px;
  background: var(--primary);
  border-radius: 50%;
}

[data-theme="dark"] .badge-dot {
  background: rgba(255, 255, 255, 0.8);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.03em;
}

.title-line {
  display: block;
}

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

.hero-description {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
}

.hero-stats {
  display: flex;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.stat-box {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

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

.hero-visual {
  position: relative;
  animation: fadeInRight 0.8s ease-out 0.2s both;
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.phone-preview {
  position: relative;
  z-index: 1;
}

.phone-frame {
  width: 280px;
  height: 520px;
  margin: 0 auto;
  background: linear-gradient(135deg, #334155 0%, #1e293b 100%);
  border-radius: 40px;
  padding: 16px;
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.2),
    0 0 0 1px rgba(255, 255, 255, 0.15) inset,
    0 0 60px rgba(56, 189, 248, 0.15);
}

.phone-screen {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  border-radius: 28px;
  overflow: hidden;
  padding: 40px 16px 16px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.message-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.message-item {
  animation: messageSlide 0.5s ease-out;
}

.message-item:nth-child(1) {
  animation-delay: 0s;
}

.message-item:nth-child(2) {
  animation-delay: 0.2s;
}

.message-item:nth-child(3) {
  animation-delay: 0.4s;
}

.message-item:nth-child(4) {
  animation-delay: 0.6s;
}

.message-item:nth-child(5) {
  animation-delay: 0.8s;
}

@keyframes messageSlide {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.message-bubble {
  display: inline-block;
  padding: 12px 16px;
  background: var(--gradient-primary);
  color: var(--text-inverse);
  border-radius: 18px 18px 18px 4px;
  font-size: 0.875rem;
  box-shadow: var(--shadow-md);
  max-width: 80%;
}

.hero-decoration {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.decoration-item {
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: var(--primary-200);
  opacity: 0.3;
  filter: blur(60px);
}

.decoration-item:nth-child(1) {
  top: -100px;
  right: -100px;
}

.decoration-item:nth-child(2) {
  bottom: -100px;
  left: -100px;
}

.decoration-item:nth-child(3) {
  top: 50%;
  right: -50px;
  width: 150px;
  height: 150px;
}

.hero-scroll {
  display: none;
}

.scroll-indicator {
  width: 2px;
  height: 30px;
  background: var(--primary);
  border-radius: var(--border-radius-full);
}

@keyframes bounce {

  0%,
  100% {
    transform: translateX(-50%) translateY(0);
  }

  50% {
    transform: translateX(-50%) translateY(10px);
  }
}

/* ============================================
   功能特色
   ============================================ */
.features {
  padding: var(--spacing-2xl) 0;
  background: var(--bg-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
}

.feature-card {
  background: var(--bg-primary);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

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

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

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

.feature-icon {
  width: 52px;
  height: 52px;
  background: var(--gradient-primary);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--text-inverse);
  margin-bottom: var(--spacing-sm);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base);
}

.feature-card:hover .feature-icon {
  transform: scale(1.1) rotate(5deg);
}

/* 不同颜色的功能卡片图标 */
.feature-card:nth-child(1) .feature-icon {
  background: var(--gradient-primary);
}

.feature-card:nth-child(2) .feature-icon {
  background: var(--gradient-teal);
}

.feature-card:nth-child(3) .feature-icon {
  background: var(--gradient-green);
}

.feature-card:nth-child(4) .feature-icon {
  background: var(--gradient-purple);
}

.feature-card:nth-child(5) .feature-icon {
  background: var(--gradient-orange);
}

.feature-card:nth-child(6) .feature-icon {
  background: var(--gradient-pink);
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

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

/* ============================================
   产品服务
   ============================================ */
.products {
  padding: var(--spacing-2xl) 0;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: var(--spacing-xl);
}

.product-card {
  background: var(--bg-primary);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-xl);
  border: 2px solid var(--border-color);
  transition: all var(--transition-base);
  position: relative;
  display: flex;
  flex-direction: column;
}

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

.product-card.featured {
  border-color: var(--primary);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, rgba(37, 99, 235, 0.1) 100%);
}

.product-badge {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  padding: 0.375rem 0.875rem;
  background: var(--gradient-primary);
  color: var(--text-inverse);
  border-radius: var(--border-radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: var(--shadow-md);
}

.product-header {
  margin-bottom: var(--spacing-lg);
}

.product-icon {
  width: 52px;
  height: 52px;
  background: var(--gradient-primary);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--text-inverse);
  margin-bottom: var(--spacing-sm);
  box-shadow: var(--shadow-md);
}

.product-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.product-card p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
}

.product-features {
  list-style: none;
  margin-bottom: var(--spacing-lg);
  flex: 1;
}

.product-features li {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.product-features i {
  color: var(--success);
  margin-top: 0.25rem;
  flex-shrink: 0;
}

.product-features span {
  color: var(--text-secondary);
  line-height: 1.6;
}

.product-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  transition: gap var(--transition-fast);
}

.product-link:hover {
  gap: 0.75rem;
}

/* 不同颜色的产品卡片图标 */
.product-card:nth-child(1) .product-icon {
  background: var(--gradient-primary);
}

.product-card:nth-child(2) .product-icon {
  background: var(--gradient-purple);
}

.product-card:nth-child(3) .product-icon {
  background: var(--gradient-teal);
}

/* ============================================
   行业解决方案
   ============================================ */
.solutions {
  padding: var(--spacing-2xl) 0;
  background: var(--bg-secondary);
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

.solution-card {
  background: var(--bg-primary);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--border-color);
  text-align: center;
  transition: all var(--transition-base);
}

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

.solution-icon {
  width: 56px;
  height: 56px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--text-inverse);
  margin: 0 auto var(--spacing-sm);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base);
}

.solution-card:hover .solution-icon {
  transform: scale(1.1) rotate(5deg);
}

.solution-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.solution-card p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.solution-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.solution-tags span {
  padding: 0.375rem 0.875rem;
  background: var(--primary-50);
  color: var(--primary);
  border-radius: var(--border-radius-full);
  font-size: 0.875rem;
  font-weight: 500;
}

/* 不同颜色的解决方案卡片图标 */
.solution-card:nth-child(1) .solution-icon {
  background: var(--gradient-orange);
}

.solution-card:nth-child(2) .solution-icon {
  background: var(--gradient-teal);
}

.solution-card:nth-child(3) .solution-icon {
  background: var(--gradient-indigo);
}

.solution-card:nth-child(4) .solution-icon {
  background: var(--gradient-pink);
}

/* 解决方案标签多彩化 */
.solution-card:nth-child(1) .solution-tags span {
  background: #fff7ed;
  color: #ea580c;
}

.solution-card:nth-child(2) .solution-tags span {
  background: #f0fdfa;
  color: #0d9488;
}

.solution-card:nth-child(3) .solution-tags span {
  background: #eef2ff;
  color: #4f46e5;
}

.solution-card:nth-child(4) .solution-tags span {
  background: #fdf2f8;
  color: #db2777;
}

/* ============================================
   价格方案
   ============================================ */
.pricing {
  padding: var(--spacing-2xl) 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.pricing-card {
  background: var(--bg-primary);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-xl);
  border: 2px solid var(--border-color);
  transition: all var(--transition-base);
  position: relative;
  display: flex;
  flex-direction: column;
}

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

.pricing-card.featured {
  border-color: var(--primary);
  transform: scale(1.05);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, rgba(37, 99, 235, 0.1) 100%);
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-8px);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.375rem 1rem;
  background: var(--gradient-primary);
  color: var(--text-inverse);
  border-radius: var(--border-radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: var(--shadow-md);
}

.pricing-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.pricing-header h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.pricing-price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: var(--spacing-sm);
}

.pricing-price .price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}

.pricing-price .unit {
  font-size: 1rem;
  color: var(--text-secondary);
}

.pricing-desc {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

.pricing-features {
  list-style: none;
  margin-bottom: var(--spacing-lg);
  flex: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
}

.pricing-features i {
  color: var(--success);
  flex-shrink: 0;
}

/* 不同颜色的价格卡片 */
.pricing-card:nth-child(1) .pricing-price .price {
  color: var(--accent-teal);
}

.pricing-card:nth-child(2) .pricing-price .price {
  color: var(--primary);
}

.pricing-card:nth-child(3) .pricing-price .price {
  color: var(--accent-purple);
}

.pricing-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--border-radius-lg);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.pricing-note i {
  color: var(--primary);
}

/* ============================================
   数据统计
   ============================================ */
.statistics {
  padding: var(--spacing-2xl) 0;
  background: linear-gradient(135deg, #0ea5e9 0%, #6366f1 50%, #8b5cf6 100%);
  color: var(--text-inverse);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--spacing-xl);
}

.stat-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.2);
  text-align: center;
  transition: all var(--transition-base);
}

.stat-card:hover {
  transform: translateY(-8px);
  background: rgba(255, 255, 255, 0.15);
  box-shadow: var(--shadow-xl);
}

.statistics .stat-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.9;
  color: var(--text-inverse);
}

.statistics .stat-value {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1;
  margin-bottom: var(--spacing-sm);
  color: var(--text-inverse);
}

.statistics .stat-label {
  font-size: 1rem;
  opacity: 0.9;
  font-weight: 500;
  color: var(--text-inverse);
}

/* ============================================
   API快速接入
   ============================================ */
.api-integration {
  padding: var(--spacing-2xl) 0;
  background: var(--bg-secondary);
}

.api-content {
  max-width: 1000px;
  margin: 0 auto;
}

.api-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.api-step {
  background: var(--bg-primary);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--border-color);
  text-align: center;
  position: relative;
  transition: all var(--transition-base);
}

.api-step:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.step-number {
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  color: var(--text-inverse);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.125rem;
  box-shadow: var(--shadow-md);
}

.step-icon {
  width: 64px;
  height: 64px;
  background: var(--gradient-primary);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: var(--text-inverse);
  margin: var(--spacing-md) auto;
  box-shadow: var(--shadow-md);
}

.api-step h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.api-step p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

/* 不同颜色的API步骤图标 */
.api-step:nth-child(1) .step-icon,
.api-step:nth-child(1) .step-number {
  background: var(--gradient-primary);
}

.api-step:nth-child(2) .step-icon,
.api-step:nth-child(2) .step-number {
  background: var(--gradient-purple);
}

.api-step:nth-child(3) .step-icon,
.api-step:nth-child(3) .step-number {
  background: var(--gradient-teal);
}

.api-step:nth-child(4) .step-icon,
.api-step:nth-child(4) .step-number {
  background: var(--gradient-green);
}

.api-languages {
  background: var(--bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--border-color);
  text-align: center;
}

.api-languages h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
}

.language-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-bottom: var(--spacing-xl);
}

.language-tag {
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-full);
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.language-tag:hover {
  background: var(--primary);
  color: var(--text-inverse);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.api-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================
   客户案例
   ============================================ */
.testimonials {
  padding: var(--spacing-2xl) 0;
}

.testimonial-slider {
  overflow: hidden;
  position: relative;
  padding: var(--spacing-lg) 0;
}

.testimonial-track {
  display: flex;
  gap: var(--spacing-xl);
  animation: scroll 30s linear infinite;
  width: fit-content;
}

.testimonial-track:hover {
  animation-play-state: paused;
}

.testimonial-item {
  flex: 0 0 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.client-logo {
  width: 180px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  padding: var(--spacing-md);
  transition: all var(--transition-base);
}

.client-logo:hover {
  transform: scale(1.05) translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.client-logo img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  filter: grayscale(100%) opacity(0.6);
  transition: filter var(--transition-base);
}

.client-logo:hover img {
  filter: grayscale(0%) opacity(1);
}

@keyframes scroll {
  0% {
    transform: translateX(0);
  }

  100% {
    transform: translateX(-50%);
  }
}

/* ============================================
   CTA区域
   ============================================ */
.cta {
  padding: var(--spacing-2xl) 0;
  background: linear-gradient(135deg, #14b8a6 0%, #0ea5e9 50%, #6366f1 100%);
  color: var(--text-inverse);
  text-align: center;
}

.cta-content h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.cta-content p {
  font-size: clamp(1rem, 2vw, 1.25rem);
  margin-bottom: var(--spacing-xl);
  opacity: 0.9;
}

.cta-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================
   关于我们
   ============================================ */
.about {
  padding: var(--spacing-2xl) 0;
  background: var(--bg-secondary);
}

.about-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.about-section {
  background: var(--bg-primary);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 100%;
}

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

.about-section:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.about-section:hover::before {
  transform: scaleX(1);
}

.about-icon {
  width: 64px;
  height: 64px;
  background: var(--gradient-primary);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: var(--text-inverse);
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base);
}

.about-section:hover .about-icon {
  transform: scale(1.1) rotate(5deg);
}

/* 不同颜色的关于我们图标 */
.about-section:nth-child(1) .about-icon {
  background: var(--gradient-primary);
}

.about-section:nth-child(2) .about-icon {
  background: var(--gradient-purple);
}

.about-section:nth-child(3) .about-icon {
  background: var(--gradient-pink);
}

.about-section h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.about-section p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 0;
  flex: 1;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
  flex: 1;
}

.value-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  transition: all var(--transition-base);
  border: none;
}

.value-item:hover {
  background: var(--primary-50);
  transform: translateX(4px);
}

.value-item i {
  color: var(--primary);
  font-size: 1.25rem;
  flex-shrink: 0;
  width: 24px;
  text-align: center;
}

.value-item span {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9375rem;
}

.certificates {
  margin-top: var(--spacing-xl);
}

.certificates h3 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xl);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.certificates h3 i {
  color: var(--primary);
}

.certificates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-xl);
}

.certificate-item {
  background: var(--bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--border-color);
  text-align: center;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

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

.certificate-item:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.certificate-item:hover::before {
  transform: scaleX(1);
}

.certificate-icon {
  width: 64px;
  height: 64px;
  background: var(--gradient-primary);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: var(--text-inverse);
  margin: 0 auto var(--spacing-md);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base);
}

.certificate-item:hover .certificate-icon {
  transform: scale(1.1) rotate(5deg);
}

/* 不同颜色的资质认证图标 */
.certificate-item:nth-child(1) .certificate-icon {
  background: var(--gradient-orange);
}

.certificate-item:nth-child(2) .certificate-icon {
  background: var(--gradient-teal);
}

.certificate-item:nth-child(3) .certificate-icon {
  background: var(--gradient-indigo);
}

.certificate-item:nth-child(4) .certificate-icon {
  background: var(--gradient-green);
}

.certificate-item h4 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.certificate-item p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

/* ============================================
   底部信息
   ============================================ */
.footer {
  background: var(--gray-800);
  color: var(--text-inverse);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-section h4 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-section ul li a,
.footer-section ul li span {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: all var(--transition-fast);
  display: inline-block;
}

.footer-section ul li a:hover {
  color: var(--text-inverse);
  transform: translateX(4px);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: var(--spacing-md);
}

.footer-desc {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
  font-size: 0.9375rem;
}

.social-links {
  display: flex;
  gap: var(--spacing-sm);
}

.social-link {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-inverse);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.social-link:hover {
  background: var(--primary);
  transform: translateY(-4px);
}

.contact-info {
  color: rgba(255, 255, 255, 0.7);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  font-size: 0.9375rem;
}

.contact-item i {
  color: var(--primary-400);
  width: 20px;
}

.qr-code {
  text-align: center;
  margin-top: var(--spacing-md);
}

.qr-code img {
  width: 100px;
  height: 100px;
  border-radius: var(--border-radius-lg);
  margin-bottom: var(--spacing-sm);
  border: 2px solid rgba(255, 255, 255, 0.1);
}

.qr-code span {
  display: block;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
}

.footer-bottom p {
  margin-bottom: 0.25rem;
}

/* ============================================
   返回顶部按钮
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  color: var(--text-inverse);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-xl);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
}

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

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2xl);
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-visual {
    order: -1;
  }

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

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

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

  .footer-section:first-child {
    grid-column: 1 / -1;
    text-align: center;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background: var(--bg-primary);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--spacing-xl);
    transition: left var(--transition-base);
    box-shadow: var(--shadow-xl);
    border-top: 1px solid var(--border-color);
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-actions {
    display: none;
  }

  .nav-menu.active+.nav-actions,
  .nav-menu.active~.nav-actions {
    display: flex;
    flex-direction: column;
    width: 100%;
    margin-top: var(--spacing-lg);
  }

  .features-grid,
  .products-grid,
  .solutions-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .pricing-card.featured {
    transform: scale(1);
  }

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

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

  .about-content {
    grid-template-columns: 1fr;
  }

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

  .about-section {
    height: auto;
  }

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

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .hero-stats {
    flex-direction: column;
    align-items: center;
  }

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

  .api-steps {
    grid-template-columns: 1fr;
  }

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

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

  .phone-frame {
    width: 260px;
    height: 520px;
  }
}

/* ============================================
   打印样式
   ============================================ */
@media print {

  .header,
  .back-to-top,
  .page-loader {
    display: none;
  }
}