/* ========================================
   生物防治官网 - 全局样式
   主题：科技蓝 + 生物绿
   ======================================== */

/* ----------------------------------------
   CSS 变量定义
   ---------------------------------------- */
:root {
  /* 主色调 */
  --color-primary: #1a73e8;
  --color-primary-dark: #1557b0;
  --color-primary-light: #4a9eff;

  /* 深色背景 */
  --color-bg-dark: #1a1a2e;
  --color-bg-darker: #0f0f23;

  /* 绿色点缀（生物防治主题） */
  --color-green: #27ae60;
  --color-green-dark: #1e8449;
  --color-green-light: #52c78a;

  /* 辅助色 */
  --color-warning: #f39c12;
  --color-danger: #e74c3c;
  --color-purple: #8e44ad;

  /* 文字色 */
  --color-text: #333333;
  --color-text-secondary: #666666;
  --color-text-light: #999999;
  --color-white: #ffffff;

  /* 背景色 */
  --color-bg-white: #ffffff;
  --color-bg-light: #f8f9fa;
  --color-bg-blue: #f0f4f8;

  /* 边框 */
  --color-border: #e0e6ed;
  --color-border-light: #f0f4f8;

  /* 间距 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  --spacing-4xl: 80px;

  /* 字体大小 */
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-md: 18px;
  --font-size-lg: 20px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;
  --font-size-3xl: 40px;
  --font-size-4xl: 52px;
  --font-size-5xl: 64px;

  /* 字体粗细 */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* 行高 */
  --line-height-tight: 1.2;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.8;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.10);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.15);
  --shadow-primary: 0 4px 16px rgba(26, 115, 232, 0.3);
  --shadow-green: 0 4px 16px rgba(39, 174, 96, 0.3);

  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* 导航高度 */
  --navbar-height: 70px;

  /* 容器宽度 */
  --container-max: 1200px;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

ul,
ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

/* ----------------------------------------
   排版系统
   ---------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-md); }

p {
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}

strong {
  font-weight: var(--font-weight-semibold);
}

/* ----------------------------------------
   容器
   ---------------------------------------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

/* ----------------------------------------
   按钮系统
   ---------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 12px var(--spacing-xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  border: 2px solid transparent;
  line-height: 1;
}

.btn:focus {
  outline: 3px solid rgba(26, 115, 232, 0.3);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 115, 232, 0.4);
}

.btn-secondary {
  background: var(--color-green);
  color: var(--color-white);
  border-color: var(--color-green);
  box-shadow: var(--shadow-green);
}

.btn-secondary:hover {
  background: var(--color-green-dark);
  border-color: var(--color-green-dark);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(39, 174, 96, 0.4);
}

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

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

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

.btn-outline-white:hover {
  background: rgba(255, 255, 255, 0.15);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-large {
  padding: 16px 40px;
  font-size: var(--font-size-md);
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: 8px 16px;
  font-size: var(--font-size-sm);
}

/* ----------------------------------------
   卡片组件
   ---------------------------------------- */
.card {
  background: var(--color-bg-white);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-normal);
}

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

.card-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, rgba(26, 115, 232, 0.1), rgba(26, 115, 232, 0.05));
}

.card-icon.green {
  background: linear-gradient(135deg, rgba(39, 174, 96, 0.1), rgba(39, 174, 96, 0.05));
}

.card-icon.warning {
  background: linear-gradient(135deg, rgba(243, 156, 18, 0.1), rgba(243, 156, 18, 0.05));
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.card-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ----------------------------------------
   网格系统
   ---------------------------------------- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-xl);
}

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

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

.grid-6 {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--spacing-lg);
}

/* ----------------------------------------
   导航栏
   ---------------------------------------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
  transition: all var(--transition-normal);
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  border-bottom-color: var(--color-border);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 0;
  overflow: visible;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 18px;
  font-weight: var(--font-weight-extrabold);
  color: var(--color-primary);
  text-decoration: none;
  flex-shrink: 0;
}

.navbar-logo span {
  color: var(--color-green);
}

.navbar-logo img {
  height: 34px;
  width: auto;
}

.navbar-logo svg {
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
  justify-content: center;
  min-width: 0;
}

.nav-links a {
  font-size: 13px;
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
  white-space: nowrap;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  right: 50%;
  height: 2px;
  background: var(--color-primary);
  transition: all var(--transition-fast);
  border-radius: var(--radius-full);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  left: 0;
  right: 0;
}

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

.nav-cta {
  margin-left: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

/* 导航CTA按钮更紧凑 */
.nav-cta .btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
}

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

.hamburger.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

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

/* ----------------------------------------
   Hero 区域
   ---------------------------------------- */
.hero {
  min-height: 100vh;
  background: linear-gradient(135deg, var(--color-bg-darker) 0%, var(--color-bg-dark) 40%, #16213e 70%, #0d3272 100%);
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--navbar-height);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(26, 115, 232, 0.15) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(39, 174, 96, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 60% 80%, rgba(142, 68, 173, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 120px;
  background: linear-gradient(to bottom, transparent, rgba(255,255,255,0.03));
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: var(--spacing-4xl) 0;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: rgba(39, 174, 96, 0.15);
  color: var(--color-green-light);
  border: 1px solid rgba(39, 174, 96, 0.3);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-lg);
}

.hero h1 {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-white);
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  letter-spacing: -1px;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-green-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: var(--font-size-xl);
  color: rgba(255, 255, 255, 0.75);
  max-width: 700px;
  margin: 0 auto var(--spacing-2xl);
  line-height: var(--line-height-relaxed);
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: var(--spacing-2xl);
  justify-content: center;
  margin-top: var(--spacing-3xl);
  padding-top: var(--spacing-3xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.hero-stat .number {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-white);
  line-height: 1;
}

.hero-stat .label {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
  margin-top: var(--spacing-xs);
}

/* ----------------------------------------
   页面Hero（子页面）
   ---------------------------------------- */
.page-hero {
  padding: calc(var(--navbar-height) + 60px) 0 60px;
  background: linear-gradient(135deg, var(--color-bg-darker) 0%, var(--color-bg-dark) 50%, #16213e 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(26, 115, 232, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.page-hero h1 {
  font-size: var(--font-size-4xl);
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
  position: relative;
}

.page-hero p {
  font-size: var(--font-size-md);
  color: rgba(255, 255, 255, 0.7);
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.5);
  position: relative;
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.6);
}

.breadcrumb a:hover {
  color: var(--color-white);
}

/* ----------------------------------------
   Section 通用
   ---------------------------------------- */
.section {
  padding: var(--spacing-4xl) 0;
}

.section-light {
  background: var(--color-bg-light);
}

.section-blue {
  background: var(--color-bg-blue);
}

.section-dark {
  background: var(--color-bg-dark);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-tag {
  display: inline-block;
  background: rgba(26, 115, 232, 0.1);
  color: var(--color-primary);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
  border: 1px solid rgba(26, 115, 232, 0.2);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-tight);
}

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

/* ----------------------------------------
   统计数字
   ---------------------------------------- */
.stats-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  padding: var(--spacing-3xl) 0;
}

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

.stat-item {
  padding: var(--spacing-xl);
  border-right: 1px solid rgba(255, 255, 255, 0.15);
}

.stat-item:last-child {
  border-right: none;
}

.stat-number {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-white);
  line-height: 1;
  margin-bottom: var(--spacing-sm);
}

.stat-suffix {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-green-light);
}

.stat-desc {
  font-size: var(--font-size-base);
  color: rgba(255, 255, 255, 0.8);
}

/* ----------------------------------------
   功能卡片
   ---------------------------------------- */
.feature-card {
  background: var(--color-bg-white);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-green));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

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

.feature-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-6px);
  border-color: rgba(26, 115, 232, 0.2);
}

.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(135deg, rgba(26, 115, 232, 0.12), rgba(26, 115, 232, 0.06));
  transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon {
  transform: scale(1.1);
  background: linear-gradient(135deg, rgba(26, 115, 232, 0.2), rgba(26, 115, 232, 0.1));
}

.feature-icon.green {
  background: linear-gradient(135deg, rgba(39, 174, 96, 0.12), rgba(39, 174, 96, 0.06));
}

.feature-card:hover .feature-icon.green {
  background: linear-gradient(135deg, rgba(39, 174, 96, 0.2), rgba(39, 174, 96, 0.1));
}

.feature-icon.warning {
  background: linear-gradient(135deg, rgba(243, 156, 18, 0.12), rgba(243, 156, 18, 0.06));
}

.feature-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.feature-text {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ----------------------------------------
   图文交替布局
   ---------------------------------------- */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4xl);
  align-items: center;
  padding: var(--spacing-3xl) 0;
}

.feature-row + .feature-row {
  border-top: 1px solid var(--color-border-light);
}

.feature-row.reverse .feature-visual {
  order: -1;
}

.feature-visual {
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  background: linear-gradient(135deg, var(--color-bg-blue), var(--color-bg-light));
  min-height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.feature-body {
  padding: var(--spacing-xl) 0;
}

.feature-body .section-tag {
  margin-bottom: var(--spacing-md);
}

.feature-body h3 {
  font-size: var(--font-size-2xl);
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-tight);
}

.feature-body p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: var(--line-height-relaxed);
}

.feature-list {
  list-style: none;
  margin-bottom: var(--spacing-xl);
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
}

.feature-list li::before {
  content: '✓';
  color: var(--color-green);
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
  margin-top: 2px;
}

/* ----------------------------------------
   CTA 区域
   ---------------------------------------- */
.cta-section {
  background: linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-bg-darker) 100%);
  padding: var(--spacing-4xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(26, 115, 232, 0.15) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 50%, rgba(39, 174, 96, 0.1) 0%, transparent 60%);
  pointer-events: none;
}

.cta-section h2 {
  font-size: var(--font-size-3xl);
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
  position: relative;
}

.cta-section p {
  font-size: var(--font-size-md);
  color: rgba(255, 255, 255, 0.7);
  max-width: 560px;
  margin: 0 auto var(--spacing-2xl);
  position: relative;
}

.cta-form {
  display: flex;
  gap: var(--spacing-md);
  max-width: 560px;
  margin: 0 auto;
  position: relative;
}

.cta-form .form-input {
  flex: 1;
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--color-white);
}

.cta-form .form-input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.cta-form .form-input:focus {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.5);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
}

/* ----------------------------------------
   表单组件
   ---------------------------------------- */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.form-label .required {
  color: var(--color-danger);
  margin-left: 4px;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 12px var(--spacing-md);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-bg-white);
  transition: all var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.12);
}

.form-input.error,
.form-textarea.error,
.form-select.error {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.12);
}

.form-error {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--color-danger);
  margin-top: var(--spacing-xs);
}

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

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23666' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.form-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
  margin-top: var(--spacing-xs);
}

/* ----------------------------------------
   页脚
   ---------------------------------------- */
.footer {
  background: var(--color-bg-darker);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--spacing-4xl) 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-2xl);
  padding-bottom: var(--spacing-3xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand .logo {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
  display: block;
}

.footer-brand .logo span {
  color: var(--color-green);
}

.footer-brand p {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.55);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-lg);
}

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

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.6);
  transition: all var(--transition-fast);
  font-size: var(--font-size-base);
  text-decoration: none;
}

.footer-social a:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}

.footer-col h4 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-white);
  margin-bottom: var(--spacing-lg);
}

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

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

.footer-col ul li a {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.55);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.footer-col ul li a:hover {
  color: var(--color-white);
  padding-left: 4px;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.55);
}

.footer-contact-item .icon {
  width: 18px;
  flex-shrink: 0;
  color: var(--color-primary-light);
  margin-top: 2px;
}

.footer-bottom {
  padding: var(--spacing-lg) 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.35);
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.45);
  text-decoration: none;
}

.footer-bottom a:hover {
  color: rgba(255, 255, 255, 0.8);
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
}

/* ----------------------------------------
   悬浮工具
   ---------------------------------------- */
.float-tools {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  align-items: flex-end;
}

.back-to-top {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px);
  font-size: var(--font-size-lg);
}

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

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
}

.float-contact {
  position: relative;
}

.float-contact-btn {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-green), var(--color-green-dark));
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-green);
  transition: all var(--transition-normal);
  font-size: 22px;
}

.float-contact-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 24px rgba(39, 174, 96, 0.5);
}

.float-contact-panel {
  position: absolute;
  right: 64px;
  bottom: 0;
  background: var(--color-bg-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-md);
  min-width: 220px;
  opacity: 0;
  pointer-events: none;
  transform: translateX(10px);
  transition: all var(--transition-normal);
  border: 1px solid var(--color-border);
}

.float-contact-panel.active {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0);
}

.float-contact-panel h5 {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border-light);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.contact-item .icon {
  font-size: var(--font-size-lg);
  color: var(--color-primary);
}

.contact-item strong {
  display: block;
  color: var(--color-text);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
}

/* ----------------------------------------
   动画
   ---------------------------------------- */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.fade-in {
  opacity: 0;
  transition: opacity 0.6s ease, transform 0.6s ease;
  transform: translateY(10px);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
  animation: fadeIn 0.6s ease forwards;
}

.slide-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.slide-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 延迟类 */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

/* ----------------------------------------
   时间轴（关于我们页）
   ---------------------------------------- */
.timeline {
  position: relative;
  padding: var(--spacing-xl) 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-green));
  transform: translateX(-50%);
}

.timeline-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
  align-items: center;
}

.timeline-item:nth-child(odd) .timeline-content {
  grid-column: 1;
  text-align: right;
}

.timeline-item:nth-child(odd) .timeline-year {
  grid-column: 2;
}

.timeline-item:nth-child(even) .timeline-year {
  grid-column: 1;
  text-align: right;
}

.timeline-item:nth-child(even) .timeline-content {
  grid-column: 2;
}

.timeline-dot {
  position: absolute;
  left: 50%;
  width: 16px;
  height: 16px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  border: 3px solid var(--color-bg-white);
  transform: translateX(-50%);
  box-shadow: 0 0 0 4px rgba(26, 115, 232, 0.2);
  z-index: 1;
}

.timeline-year {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-primary);
  padding: 0 var(--spacing-xl);
}

.timeline-content {
  background: var(--color-bg-white);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border-light);
}

.timeline-content h4 {
  font-size: var(--font-size-lg);
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.timeline-content p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ----------------------------------------
   对比/定价表格（下载页）
   ---------------------------------------- */
.pricing-table {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  align-items: start;
}

.pricing-column {
  background: var(--color-bg-white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 2px solid var(--color-border-light);
  transition: all var(--transition-normal);
}

.pricing-column.featured {
  border-color: var(--color-primary);
  transform: scale(1.03);
  box-shadow: var(--shadow-xl), 0 0 0 1px var(--color-primary);
}

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

.pricing-column.featured:hover {
  transform: scale(1.03) translateY(-4px);
}

.pricing-header {
  padding: var(--spacing-xl);
  background: var(--color-bg-light);
  text-align: center;
  border-bottom: 1px solid var(--color-border-light);
}

.pricing-column.featured .pricing-header {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-white);
}

.pricing-column.featured .pricing-header h3,
.pricing-column.featured .pricing-header p {
  color: var(--color-white);
}

.pricing-header h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.pricing-price {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-primary);
  margin: var(--spacing-sm) 0;
}

.pricing-column.featured .pricing-price {
  color: var(--color-white);
}

.pricing-body {
  padding: var(--spacing-xl);
}

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

.pricing-features li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border-light);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features li .check {
  color: var(--color-green);
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
}

.pricing-features li .cross {
  color: var(--color-text-light);
  flex-shrink: 0;
}

/* ----------------------------------------
   FAQ 折叠面板
   ---------------------------------------- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item.active {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(26, 115, 232, 0.1);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg) var(--spacing-xl);
  cursor: pointer;
  user-select: none;
  transition: all var(--transition-fast);
  background: var(--color-bg-white);
}

.faq-question:hover {
  background: var(--color-bg-light);
}

.faq-item.active .faq-question {
  background: rgba(26, 115, 232, 0.04);
}

.faq-question h4 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin: 0;
  line-height: 1.4;
}

.faq-item.active .faq-question h4 {
  color: var(--color-primary);
}

.faq-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  background: var(--color-bg-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  transition: all var(--transition-normal);
  font-weight: var(--font-weight-normal);
  line-height: 1;
}

.faq-item.active .faq-icon {
  background: var(--color-primary);
  color: var(--color-white);
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer-inner {
  padding: 0 var(--spacing-xl) var(--spacing-lg);
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  border-top: 1px solid var(--color-border-light);
}

/* ----------------------------------------
   通知 / Toast
   ---------------------------------------- */
.toast {
  position: fixed;
  top: calc(var(--navbar-height) + 16px);
  right: 24px;
  z-index: 9999;
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-md) var(--spacing-xl);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  opacity: 0;
  transform: translateX(100%);
  transition: all var(--transition-normal);
  border-left: 4px solid var(--color-primary);
  min-width: 280px;
  max-width: 400px;
}

.toast.show {
  opacity: 1;
  transform: translateX(0);
}

.toast.success {
  border-left-color: var(--color-green);
}

.toast.error {
  border-left-color: var(--color-danger);
}

.toast-icon {
  font-size: var(--font-size-xl);
}

/* ----------------------------------------
   工具类
   ---------------------------------------- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--color-primary); }
.text-green { color: var(--color-green); }
.text-warning { color: var(--color-warning); }
.text-danger { color: var(--color-danger); }
.text-muted { color: var(--color-text-secondary); }
.text-white { color: var(--color-white); }

.bg-primary { background-color: var(--color-primary); }
.bg-green { background-color: var(--color-green); }
.bg-dark { background-color: var(--color-bg-dark); }
.bg-light { background-color: var(--color-bg-light); }
.bg-white { background-color: var(--color-bg-white); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }
.mt-5 { margin-top: var(--spacing-2xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }
.mb-5 { margin-bottom: var(--spacing-2xl); }

.pt-0 { padding-top: 0; }
.pb-0 { padding-bottom: 0; }

.d-none { display: none !important; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

.overflow-hidden { overflow: hidden; }
.position-relative { position: relative; }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: var(--radius-full); }

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

.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
}

.tag-primary {
  background: rgba(26, 115, 232, 0.1);
  color: var(--color-primary);
}

.tag-green {
  background: rgba(39, 174, 96, 0.1);
  color: var(--color-green);
}

.tag-warning {
  background: rgba(243, 156, 18, 0.1);
  color: var(--color-warning);
}

.divider {
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-green));
  border-radius: var(--radius-full);
  margin: var(--spacing-md) auto;
}

/* ----------------------------------------
   响应式断点
   ---------------------------------------- */

/* 1200px - 大屏幕 */
@media (max-width: 1200px) {
  :root {
    --font-size-5xl: 56px;
    --font-size-4xl: 44px;
  }

  .container {
    padding: 0 var(--spacing-xl);
  }

  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
  }
}

/* 992px - 平板横屏 */
@media (max-width: 992px) {
  :root {
    --font-size-5xl: 48px;
    --font-size-4xl: 36px;
    --font-size-3xl: 32px;
  }

  .hero h1 {
    font-size: 48px;
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-6 {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .stat-item {
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  }

  .stat-item:nth-child(2n) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  }

  .stat-item:last-child,
  .stat-item:nth-last-child(2):nth-child(odd) {
    border-bottom: none;
  }

  .feature-row {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .feature-row.reverse .feature-visual {
    order: 0;
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    padding-left: 48px;
    position: relative;
  }

  .timeline-dot {
    left: 20px;
    top: 24px;
  }

  .timeline-item:nth-child(odd) .timeline-content,
  .timeline-item:nth-child(even) .timeline-content {
    grid-column: 1;
    text-align: left;
    order: 2;
  }

  .timeline-item:nth-child(odd) .timeline-year,
  .timeline-item:nth-child(even) .timeline-year {
    grid-column: 1;
    text-align: left;
    order: 1;
    padding: 0;
  }

  .pricing-table {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }

  .pricing-column.featured {
    transform: none;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
  }
}

/* 1200px - 提前切换汉堡菜单 */
@media (max-width: 1200px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    flex-direction: column;
    padding: var(--spacing-lg) var(--spacing-xl) var(--spacing-xl);
    gap: var(--spacing-sm);
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--color-border);
    animation: slideDown 0.25s ease;
  }

  @keyframes slideDown {
    from {
      opacity: 0;
      transform: translateY(-10px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links a {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
  }

  .nav-links a::after {
    display: none;
  }

  .nav-links a:hover,
  .nav-links a.active {
    background: var(--color-bg-blue);
  }

  .nav-cta {
    margin-left: 0;
    margin-top: var(--spacing-sm);
    flex-direction: column;
    gap: var(--spacing-sm);
  }

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

/* 1440px 以上桌面端：恢复水平导航 */
@media (min-width: 1201px) {
  .hamburger {
    display: none !important;
  }

  .nav-links {
    display: flex !important;
    position: static;
    background: none;
    flex-direction: row;
    padding: 0;
    box-shadow: none;
    border-top: none;
    animation: none;
    flex: 1;
    justify-content: center;
    gap: 2px;
  }

  .nav-links a {
    font-size: 13px;
    padding: 6px 10px;
    white-space: nowrap;
  }

  .nav-links a::after {
    display: block;
  }

  .nav-cta {
    margin-left: 8px;
    flex-direction: row;
    gap: 6px;
    margin-top: 0;
  }

  .nav-cta .btn {
    width: auto;
  }
}

/* 768px - 平板竖屏 */
@media (max-width: 768px) {
  :root {
    --font-size-5xl: 40px;
    --font-size-4xl: 32px;
    --font-size-3xl: 28px;
    --font-size-2xl: 24px;
    --spacing-4xl: 60px;
  }

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

  /* Hero */
  .hero h1 {
    font-size: 36px;
  }

  .hero p {
    font-size: var(--font-size-base);
  }

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

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

  .hero-stats {
    flex-direction: column;
    gap: var(--spacing-lg);
  }

  /* 网格 */
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .grid-4,
  .grid-6 {
    grid-template-columns: repeat(2, 1fr);
  }

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

  /* CTA 表单 */
  .cta-form {
    flex-direction: column;
  }

  /* 页脚 */
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
  }

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

  .section-title {
    font-size: 28px;
  }
}

/* 576px - 手机 */
@media (max-width: 576px) {
  :root {
    --font-size-5xl: 32px;
    --font-size-4xl: 28px;
    --font-size-3xl: 24px;
    --spacing-4xl: 48px;
  }

  .hero h1 {
    font-size: 30px;
    letter-spacing: -0.5px;
  }

  .btn-large {
    padding: 14px 28px;
    font-size: var(--font-size-base);
  }

  .grid-4,
  .grid-6 {
    grid-template-columns: 1fr;
  }

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

  .stat-number {
    font-size: var(--font-size-4xl);
  }

  .card {
    padding: var(--spacing-lg);
  }

  .float-tools {
    right: 16px;
    bottom: 16px;
  }

  .float-contact-panel {
    right: 60px;
    min-width: 190px;
  }

  .page-hero h1 {
    font-size: 28px;
  }

  .pricing-column.featured {
    transform: none;
  }

  .section-header {
    margin-bottom: var(--spacing-2xl);
  }
}