/* ============================================================
   CSS 变量 - 主题色由 API 返回的 theme_color 动态覆盖
   ============================================================ */
:root {
  --primary-color: #409EFF;
  --primary-dark: #2b7dd9;
  --primary-light: #ecf5ff;
  --primary-bg: rgba(64,158,255,0.08);
  --text-primary: #1d2129;
  --text-secondary: #4e5969;
  --text-tertiary: #86909c;
  --bg-white: #ffffff;
  --bg-page: #f7f8fa;
  --border-color: #e5e6eb;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --max-width: 1200px;
  --nav-height: 64px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   重置与基础
   ============================================================ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-stack);
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { max-width: 100%; height: auto; display: block; }
button, input, select, textarea {
  font-family: inherit; font-size: inherit; border: none; outline: none;
}
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ============================================================
   滚动渐入动画
   ============================================================ */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--transition), transform 0.6s var(--transition);
}
.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   按钮通用样式
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 28px; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 15px; cursor: pointer;
  transition: all var(--transition); border: 2px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--primary-color); color: #fff; border-color: var(--primary-color);
}
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(64,158,255,0.4); }
.btn-outline {
  background: transparent; color: #fff; border-color: rgba(255,255,255,0.6);
}
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.1); transform: translateY(-2px); }
.btn-ghost {
  background: transparent; color: var(--primary-color); border-color: var(--primary-color);
}
.btn-ghost:hover { background: var(--primary-bg); transform: translateY(-2px); }

/* 区块标题 */
.section-header { text-align: center; margin-bottom: 56px; }
.section-header h2 { font-size: 32px; font-weight: 700; margin-bottom: 12px; }
.section-header p { font-size: 16px; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }
.section-header .section-line {
  width: 48px; height: 3px; background: var(--primary-color);
  border-radius: 2px; margin: 16px auto 0;
}

/* ============================================================
   1. 导航栏（固定吸顶）
   ============================================================ */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-height); transition: all var(--transition);
  background: transparent;
}
.navbar.scrolled {
  background: rgba(255,255,255,0.98);
  box-shadow: 0 1px 8px rgba(0,0,0,0.06);
  backdrop-filter: blur(10px);
}
.navbar .container {
  display: flex; align-items: center; justify-content: space-between; height: 100%;
}
.navbar-brand {
  display: flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 700;
}
.navbar-brand img { height: 32px; width: auto; }
/* Logo文字：默认白色，滚动后变深色 */
.navbar-brand .brand-name { color: #fff; transition: color var(--transition); }
.navbar.scrolled .navbar-brand .brand-name { color: var(--text-primary); }

.navbar-links {
  display: flex; align-items: center; gap: 32px;
}
.navbar-links a {
  font-size: 15px; font-weight: 500; transition: color var(--transition);
  color: rgba(255,255,255,0.85);
}
.navbar.scrolled .navbar-links a { color: var(--text-secondary); }
.navbar-links a:hover { color: var(--primary-color); }

.navbar-login .btn {
  padding: 8px 20px; font-size: 14px;
  background: rgba(255,255,255,0.15); color: #fff; border-color: rgba(255,255,255,0.3);
}
.navbar.scrolled .navbar-login .btn {
  background: var(--primary-color); color: #fff; border-color: var(--primary-color);
}
.navbar.scrolled .navbar-login .btn:hover {
  background: var(--primary-dark); border-color: var(--primary-dark);
}

/* 汉堡菜单（移动端） */
.navbar-toggle {
  display: none; background: none; cursor: pointer; padding: 4px;
}
.navbar-toggle span {
  display: block; width: 22px; height: 2px; margin: 5px 0;
  background: #fff; transition: all var(--transition); border-radius: 1px;
}
.navbar.scrolled .navbar-toggle span { background: var(--text-primary); }
.navbar-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.navbar-toggle.active span:nth-child(2) { opacity: 0; }
.navbar-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* 移动端菜单面板 */
.mobile-menu {
  display: none; position: fixed; top: var(--nav-height); left: 0; right: 0;
  background: var(--bg-white); box-shadow: var(--shadow-md); padding: 16px 24px;
  flex-direction: column; gap: 4px; z-index: 999;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  display: block; padding: 12px 0; font-size: 15px; color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
}
.mobile-menu a:last-child { border-bottom: none; }

/* ============================================================
   2. Hero 区
   ============================================================ */
.hero {
  min-height: 100vh; display: flex; flex-direction: column;
  justify-content: center; align-items: center; text-align: center;
  padding: 120px 24px 80px; position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--primary-color) 0%, #1a3a5c 100%);
}
/* 装饰圆圈 */
.hero::before {
  content: ''; position: absolute; top: -200px; right: -200px;
  width: 600px; height: 600px; border-radius: 50%;
  background: rgba(255,255,255,0.04);
}
.hero::after {
  content: ''; position: absolute; bottom: -150px; left: -150px;
  width: 400px; height: 400px; border-radius: 50%;
  background: rgba(255,255,255,0.03);
}
.hero-content { position: relative; z-index: 1; max-width: 800px; }
.hero h1 {
  font-size: 48px; font-weight: 800; color: #fff; line-height: 1.3;
  margin-bottom: 20px; letter-spacing: -0.5px;
}
.hero .subtitle {
  font-size: 20px; color: rgba(255,255,255,0.8); margin-bottom: 40px;
  line-height: 1.6;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* Hero 底部统计 */
.hero-stats {
  position: relative; z-index: 1;
  display: flex; gap: 48px; justify-content: center;
  margin-top: 72px; padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.15);
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .value { font-size: 36px; font-weight: 800; color: #fff; }
.hero-stat .label { font-size: 14px; color: rgba(255,255,255,0.7); margin-top: 4px; }

/* ============================================================
   3. 核心价值
   ============================================================ */
.values { padding: 100px 0; background: var(--bg-page); }
.values-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.value-card {
  background: var(--bg-white); border-radius: var(--radius-md); padding: 36px 28px;
  text-align: center; transition: all var(--transition);
  border: 1px solid var(--border-color);
}
.value-card:hover {
  transform: translateY(-6px); box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}
.value-icon {
  width: 64px; height: 64px; margin: 0 auto 20px;
  background: var(--primary-bg); border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
}
.value-icon svg { width: 32px; height: 32px; fill: var(--primary-color); }
.value-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.value-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ============================================================
   4. 功能介绍（左右交替图文）
   ============================================================ */
.features { padding: 100px 0; }
.feature-item {
  display: flex; align-items: center; gap: 64px;
  margin-bottom: 80px;
}
.feature-item:last-child { margin-bottom: 0; }
/* 偶数行反向 */
.feature-item.reverse { flex-direction: row-reverse; }
.feature-image {
  flex: 1; min-width: 0; border-radius: var(--radius-lg); overflow: hidden;
  background: var(--primary-bg); aspect-ratio: 3/2;
  display: flex; align-items: center; justify-content: center;
}
.feature-image .placeholder-icon { padding: 40px; }
.feature-image .placeholder-icon svg { width: 120px; height: 120px; fill: var(--primary-color); opacity: 0.3; }
.feature-text { flex: 1; min-width: 0; }
.feature-text .feature-tag {
  display: inline-block; padding: 4px 12px; border-radius: 20px;
  background: var(--primary-bg); color: var(--primary-color);
  font-size: 13px; font-weight: 600; margin-bottom: 16px;
}
.feature-text h3 { font-size: 28px; font-weight: 700; margin-bottom: 16px; }
.feature-text p { font-size: 15px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 12px; }
.feature-text ul { margin-top: 16px; }
.feature-text li {
  padding: 6px 0; font-size: 14px; color: var(--text-secondary);
  display: flex; align-items: center; gap: 8px;
}
.feature-text li::before {
  content: ''; display: inline-block; width: 6px; height: 6px;
  background: var(--primary-color); border-radius: 50%; flex-shrink: 0;
}

/* ============================================================
   5. 套餐价格
   ============================================================ */
.pricing { padding: 100px 0; background: var(--bg-page); }
.pricing-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
  align-items: start;
}
.pricing-card {
  background: var(--bg-white); border-radius: var(--radius-md);
  padding: 40px 32px; text-align: center; position: relative;
  border: 2px solid var(--border-color); transition: all var(--transition);
}
.pricing-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.pricing-card.highlighted {
  border-color: var(--primary-color);
  box-shadow: 0 8px 40px rgba(64,158,255,0.18);
  transform: scale(1.03);
}
.pricing-card.highlighted:hover { transform: scale(1.03) translateY(-4px); }
.pricing-badge {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--primary-color); color: #fff; padding: 4px 20px;
  border-radius: 20px; font-size: 13px; font-weight: 600; white-space: nowrap;
}
.pricing-card h3 { font-size: 22px; font-weight: 700; margin-bottom: 16px; margin-top: 8px; }
.pricing-price { margin-bottom: 28px; }
.pricing-price .amount { font-size: 44px; font-weight: 800; color: var(--primary-color); }
.pricing-price .currency { font-size: 18px; font-weight: 600; color: var(--primary-color); vertical-align: top; line-height: 2.4; }
.pricing-price .period { font-size: 14px; color: var(--text-tertiary); }
.pricing-features { text-align: left; margin-bottom: 32px; }
.pricing-features li {
  padding: 8px 0; font-size: 14px; color: var(--text-secondary);
  display: flex; align-items: center; gap: 10px;
  border-bottom: 1px solid #f2f3f5;
}
.pricing-features li:last-child { border-bottom: none; }
.pricing-features .check { color: var(--primary-color); font-weight: 700; }
.pricing-features .cross { color: #c9cdd4; font-weight: 700; }
.pricing-card .btn { width: 100%; }

/* ============================================================
   6. 应用场景
   ============================================================ */
.use-cases { padding: 100px 0; }
.use-cases-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.use-case-card {
  border-radius: var(--radius-md); padding: 40px 32px;
  background: var(--bg-white); border: 1px solid var(--border-color);
  transition: all var(--transition);
}
.use-case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary-color); }
.use-case-icon {
  width: 56px; height: 56px; border-radius: 14px;
  background: var(--primary-bg); display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
}
.use-case-icon svg { width: 28px; height: 28px; fill: var(--primary-color); }
.use-case-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.use-case-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.8; }

/* ============================================================
   7. 客户证言
   ============================================================ */
.testimonials { padding: 100px 0; background: var(--bg-page); }
.testimonials-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.testimonial-card {
  background: var(--bg-white); border-radius: var(--radius-md); padding: 32px;
  border: 1px solid var(--border-color); transition: all var(--transition);
}
.testimonial-card:hover { box-shadow: var(--shadow-md); }
.testimonial-quote {
  font-size: 14px; color: var(--text-secondary); line-height: 1.8;
  margin-bottom: 24px; position: relative; padding-left: 16px;
  border-left: 3px solid var(--primary-color);
}
.testimonial-author { display: flex; align-items: center; gap: 12px; }
.testimonial-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary-bg); display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 700; color: var(--primary-color); flex-shrink: 0;
  overflow: hidden;
}
.testimonial-avatar img { width: 100%; height: 100%; object-fit: cover; }
.testimonial-info .name { font-size: 15px; font-weight: 600; }
.testimonial-info .title { font-size: 13px; color: var(--text-tertiary); }

/* ============================================================
   8. FAQ 手风琴
   ============================================================ */
.faq { padding: 100px 0; }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border-color); border-radius: var(--radius-sm);
  margin-bottom: 12px; overflow: hidden; transition: all var(--transition);
}
.faq-item.active { border-color: var(--primary-color); box-shadow: 0 2px 12px rgba(64,158,255,0.1); }
.faq-question {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; cursor: pointer; font-size: 15px; font-weight: 600;
  background: var(--bg-white); transition: background var(--transition);
  gap: 16px;
}
.faq-question:hover { background: var(--primary-bg); }
.faq-arrow {
  width: 20px; height: 20px; flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-item.active .faq-arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease;
}
.faq-answer-inner {
  padding: 0 24px 20px; font-size: 14px; color: var(--text-secondary); line-height: 1.8;
}

/* ============================================================
   9. 试用申请表单
   ============================================================ */
.apply-section {
  padding: 100px 0;
  background: linear-gradient(135deg, var(--primary-color) 0%, #1a3a5c 100%);
}
.apply-section .section-header h2 { color: #fff; }
.apply-section .section-header p { color: rgba(255,255,255,0.7); }
.apply-section .section-header .section-line { background: rgba(255,255,255,0.4); }
.apply-form {
  max-width: 680px; margin: 0 auto; background: var(--bg-white);
  border-radius: var(--radius-lg); padding: 48px 40px;
  box-shadow: 0 16px 48px rgba(0,0,0,0.2);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
.form-group { margin-bottom: 20px; }
.form-group:last-child { margin-bottom: 0; }
.form-label {
  display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px;
  color: var(--text-primary);
}
.form-label .required { color: #f56c6c; margin-left: 2px; }
.form-input, .form-select, .form-textarea {
  width: 100%; padding: 10px 14px; border: 1px solid var(--border-color);
  border-radius: var(--radius-sm); font-size: 14px; color: var(--text-primary);
  transition: border-color var(--transition); background: var(--bg-white);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--primary-color); box-shadow: 0 0 0 3px rgba(64,158,255,0.1);
}
.form-input.error, .form-select.error, .form-textarea.error {
  border-color: #f56c6c;
}
.form-textarea { resize: vertical; min-height: 80px; }
.form-error { font-size: 12px; color: #f56c6c; margin-top: 4px; display: none; }
.form-error.show { display: block; }
.form-submit { text-align: center; margin-top: 28px; }
.form-submit .btn { min-width: 200px; padding: 14px 40px; font-size: 16px; }
.form-message {
  text-align: center; margin-top: 16px; padding: 10px; border-radius: var(--radius-sm);
  font-size: 14px; display: none;
}
.form-message.success { display: block; background: #f0f9eb; color: #67c23a; }
.form-message.fail { display: block; background: #fef0f0; color: #f56c6c; }

/* ============================================================
   10. 页脚
   ============================================================ */
.footer {
  background: #1d2129; color: rgba(255,255,255,0.65); padding: 64px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px;
  padding-bottom: 48px; border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .brand-name { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
.footer-brand .brand-name img { height: 28px; }
.footer-brand p { font-size: 14px; line-height: 1.8; }
.footer-links h4 { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 16px; }
.footer-links a { display: block; font-size: 14px; padding: 4px 0; transition: color var(--transition); }
.footer-links a:hover { color: var(--primary-color); }
.footer-contact p { font-size: 14px; padding: 3px 0; }
.footer-bottom {
  padding: 20px 0; text-align: center; font-size: 13px;
  color: rgba(255,255,255,0.4);
}
.footer-bottom span { margin: 0 8px; }

/* ============================================================
   11. 侧边悬浮工具栏
   ============================================================ */
.floating-toolbar {
  position: fixed;
  right: 24px;
  bottom: 80px;
  z-index: 900;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.floating-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg-white);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 12px rgba(0,0,0,0.12);
  transition: all var(--transition);
  position: relative;
}
.floating-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.16);
  background: var(--primary-color);
}
.floating-btn:hover > svg {
  fill: #fff;
  stroke: #fff;
}
.floating-btn svg {
  width: 22px;
  height: 22px;
  fill: var(--text-secondary);
  stroke: var(--text-secondary);
  transition: all var(--transition);
}
.floating-btn .tooltip {
  position: absolute;
  right: 58px;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0,0,0,0.75);
  color: #fff;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.floating-btn:hover .tooltip {
  opacity: 1;
}
.floating-btn-top {
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: all 0.3s ease;
}
.floating-btn-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.floating-btn-top:hover {
  transform: translateY(-2px);
}

/* 联系客服悬浮面板 */
.contact-popup {
  position: absolute;
  right: 58px;
  bottom: 0;
  background: var(--bg-white);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.15);
  min-width: 200px;
  opacity: 0;
  pointer-events: none;
  transform: translateX(8px);
  transition: all 0.25s ease;
}
.floating-btn:hover .contact-popup,
.contact-popup:hover {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0);
}
.contact-popup-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.contact-popup-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  padding: 6px 0;
}
.contact-popup-item svg {
  width: 16px;
  height: 16px;
  fill: var(--primary-color);
  stroke: none;
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .floating-toolbar { right: 16px; bottom: 60px; }
  .floating-btn { width: 42px; height: 42px; }
  .floating-btn svg { width: 20px; height: 20px; }
  .floating-btn .tooltip, .contact-popup { display: none; }
}

/* ============================================================
   12. 微信二维码弹窗
   ============================================================ */
.modal-overlay {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5); z-index: 2000;
  align-items: center; justify-content: center;
  backdrop-filter: blur(4px);
}
.modal-overlay.open { display: flex; }
.modal-box {
  background: var(--bg-white); border-radius: var(--radius-lg);
  padding: 40px; text-align: center; max-width: 360px; width: 90%;
  box-shadow: var(--shadow-lg); position: relative;
  animation: modalIn 0.3s ease;
}
@keyframes modalIn { from { opacity:0; transform:scale(0.9); } to { opacity:1; transform:scale(1); } }
.modal-close {
  position: absolute; top: 12px; right: 12px; width: 32px; height: 32px;
  background: none; cursor: pointer; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition);
}
.modal-close:hover { background: #f2f3f5; }
.modal-close svg { width: 16px; height: 16px; }
.modal-box h3 { font-size: 18px; font-weight: 700; margin-bottom: 16px; }
.modal-box .qr-image {
  width: 200px; height: 200px; margin: 0 auto 16px;
  border: 1px solid var(--border-color); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  background: #f9f9f9; overflow: hidden;
}
.modal-box .qr-image img { width: 100%; height: 100%; object-fit: contain; }
.modal-box .qr-tip { font-size: 14px; color: var(--text-tertiary); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .values-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-item { gap: 40px; }
}

@media (max-width: 768px) {
  :root { --nav-height: 56px; }

  /* 导航栏 */
  .navbar-links, .navbar-login { display: none; }
  .navbar-toggle { display: block; }

  /* Hero */
  .hero { min-height: auto; padding: 120px 20px 60px; }
  .hero h1 { font-size: 30px; }
  .hero .subtitle { font-size: 16px; }
  .hero-stats { gap: 24px; margin-top: 48px; padding-top: 28px; }
  .hero-stat .value { font-size: 28px; }
  .hero-actions .btn { padding: 10px 24px; font-size: 14px; }

  /* 通用区块 */
  .section-header h2 { font-size: 24px; }
  .values, .features, .pricing, .use-cases, .testimonials, .faq, .apply-section { padding: 64px 0; }
  .section-header { margin-bottom: 36px; }

  /* 核心价值 */
  .values-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .value-card { padding: 24px 20px; }

  /* 功能介绍 */
  .feature-item, .feature-item.reverse { flex-direction: column; gap: 24px; }
  .feature-text h3 { font-size: 22px; }

  /* 套餐 */
  .pricing-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
  .pricing-card.highlighted { transform: none; }
  .pricing-card.highlighted:hover { transform: translateY(-4px); }

  /* 场景 */
  .use-cases-grid { grid-template-columns: 1fr; }

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

  /* 表单 */
  .form-row { grid-template-columns: 1fr; }
  .apply-form { padding: 32px 24px; }

  /* 页脚 */
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 480px) {
  .values-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; gap: 16px; }
}