/* ============================================
   中付支付4G大机 - 深青金色设计系统
   官方权威风格 · 深青+金色点缀 · 右对齐排版
   ============================================ */

/* ========== CSS 变量 ========== */
:root {
  /* 深青配色（全新配色，区别于蓝牙POS紫色系） */
  --teal-darkest: #042F2E;
  --teal-dark: #155E75;
  --teal: #134E4A;
  --teal-light: #115E59;
  --teal-gradient-start: #155E75;
  --teal-gradient-end: #0C4A6E;
  
  /* 金色点缀（官方直营/信任） */
  --gold: #F59E0B;
  --gold-dark: #D97706;
  --gold-light: #FEF3C7;
  
  /* 绿色强调（秒到账） */
  --green: #10B981;
  --green-dark: #059669;
  
  /* 背景色 */
  --bg-white: #FFFFFF;
  --bg-page: #F8FAFC;
  --bg-light: #F0F9FF;
  
  /* 文字色 */
  --text-dark: #0F172A;
  --text-body: #334155;
  --text-muted: #64748B;
  --text-light: #94A3B8;
  
  /* 边框与阴影 */
  --border: #E2E8F0;
  --card-shadow: 0 2px 8px rgba(21,94,117,0.08);
  --shadow-md: 0 8px 24px rgba(21,94,117,0.12);
  --shadow-lg: 0 16px 40px rgba(21,94,117,0.15);
  
  /* 圆角 */
  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 16px;
  
  /* 过渡 */
  --transition: all 0.3s ease;
  
  /* 导航高度 */
  --nav-height: 70px;
}

/* ========== 基础重置 ========== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-body);
  background: var(--bg-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

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

/* 数字英文字体 */
.font-number {
  font-family: 'Barlow', 'Noto Sans SC', sans-serif;
}

/* ========== 容器 ========== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== 导航栏 ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(21,94,117,0.97);
  backdrop-filter: blur(10px);
  z-index: 1000;
  transition: var(--transition);
}

.navbar.scrolled {
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.navbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--gold);
  font-weight: 700;
  font-size: 20px;
}

.navbar-logo svg {
  width: 36px;
  height: 36px;
}

/* 导航链接 */
.navbar-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.navbar-nav a {
  color: rgba(255,255,255,0.9);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
}

.navbar-nav a:hover {
  color: var(--gold);
  background: rgba(255,255,255,0.1);
}

.navbar-nav a.active {
  color: var(--gold);
}

/* CTA按钮 */
.navbar-cta {
  background: linear-gradient(135deg, var(--teal-light), var(--teal)) !important;
  color: white !important;
  padding: 10px 20px !important;
  border-radius: var(--radius-sm) !important;
  font-weight: 600 !important;
  border: 1px solid rgba(255,255,255,0.2);
}

.navbar-cta:hover {
  background: linear-gradient(135deg, var(--teal), var(--teal-dark)) !important;
  transform: translateY(-1px);
}

/* 汉堡菜单按钮 */
.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}

.navbar-toggle span {
  width: 24px;
  height: 2px;
  background: white;
  border-radius: 2px;
  transition: var(--transition);
}

/* 移动端导航 */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: var(--teal-dark);
  padding: 16px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
  z-index: 999;
}

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

.mobile-nav a {
  display: block;
  color: white;
  padding: 14px 16px;
  font-size: 16px;
  border-radius: var(--radius-sm);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.mobile-nav a:last-child {
  border-bottom: none;
}

.mobile-nav a:hover {
  background: rgba(255,255,255,0.1);
  color: var(--gold);
}

/* ========== Hero 区域（右侧对齐，首创） ========== */
.hero {
  padding-top: calc(var(--nav-height) + 60px);
  padding-bottom: 80px;
  background: linear-gradient(135deg, var(--teal-gradient-start), var(--teal-gradient-end));
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 60%;
  height: 100%;
  background: radial-gradient(ellipse at right, rgba(245,158,11,0.08), transparent 60%);
  pointer-events: none;
}

.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

/* Hero 右侧文字内容 */
.hero-content {
  text-align: right;
  padding-right: 20px;
}

.hero-badge {
  display: inline-block;
  background: rgba(245,158,11,0.2);
  color: var(--gold);
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 24px;
  border: 1px solid rgba(245,158,11,0.3);
}

.hero-title {
  font-size: 44px;
  font-weight: 800;
  color: white;
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero-title .highlight {
  color: var(--gold);
}

.hero-subtitle {
  font-size: 18px;
  color: rgba(255,255,255,0.8);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: flex-end;
}

/* Hero 左侧设备图 */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.hero-device {
  width: 280px;
  height: 380px;
  background: linear-gradient(145deg, rgba(255,255,255,0.1), rgba(255,255,255,0.05));
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 2px solid rgba(245,158,11,0.3);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.hero-device-icon {
  font-size: 100px;
  margin-bottom: 20px;
}

.hero-device-name {
  color: var(--gold);
  font-size: 24px;
  font-weight: 700;
}

.hero-device-model {
  color: rgba(255,255,255,0.7);
  font-size: 14px;
  margin-top: 8px;
}

/* 金色主按钮 */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  color: var(--teal-dark);
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 16px;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(245,158,11,0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(245,158,11,0.4);
}

/* 白色边框次按钮 */
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: white;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 16px;
  border: 2px solid rgba(255,255,255,0.4);
  transition: var(--transition);
}

.btn-secondary:hover {
  border-color: white;
  background: rgba(255,255,255,0.1);
}

/* 深青主按钮 */
.btn-teal {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--teal-dark), var(--teal));
  color: white;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 16px;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(21,94,117,0.3);
}

.btn-teal:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(21,94,117,0.4);
}

/* ========== 通用标题样式 ========== */
.section-title {
  text-align: center;
  font-size: 36px;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 16px;
}

.section-subtitle {
  text-align: center;
  font-size: 18px;
  color: var(--text-muted);
  margin-bottom: 48px;
}

/* 右对齐标题（首创） */
.title-right {
  text-align: right;
}

.title-right .section-title {
  text-align: right;
}

.title-right .section-subtitle {
  text-align: right;
}

/* ========== 通用卡片 ========== */
.card {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border);
  transition: var(--transition);
}

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

/* 深青顶部装饰条 + 金色左边框卡片 */
.card-teal {
  border-top: 4px solid var(--teal-dark);
  border-left: 3px solid var(--gold);
}

/* 金色顶部装饰条卡片 */
.card-gold {
  border-top: 4px solid var(--gold);
}

/* ========== 区块通用样式 ========== */
.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--bg-page);
}

.section-dark {
  background: linear-gradient(135deg, var(--teal-gradient-start), var(--teal-gradient-end));
  color: white;
}

.section-dark .section-title {
  color: white;
}

.section-dark .section-subtitle {
  color: rgba(255,255,255,0.8);
}

/* ========== 官方直营说明区 ========== */
.official-section {
  padding: 80px 0;
  background: var(--bg-page);
}

.official-section .section-title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.official-section .section-subtitle {
  text-align: center;
  font-size: 18px;
  color: var(--text-muted);
  margin-top: -32px;
  margin-bottom: 48px;
}

.official-advantages {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.official-advantage {
  text-align: center;
  padding: 32px 24px;
}

.official-advantage-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.official-advantage h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--teal-dark);
  margin-bottom: 12px;
}

.official-advantage p {
  color: var(--text-muted);
  line-height: 1.7;
}

.official-emphasis {
  text-align: center;
  margin-top: 40px;
  padding: 20px;
  background: rgba(245,158,11,0.1);
  border-radius: var(--radius);
  border-left: 4px solid var(--gold);
  color: var(--text-body);
  font-weight: 500;
}

/* ========== 秒到账说明区 ========== */
.instant-section {
  padding: 80px 0;
  background: white;
}

.instant-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.instant-feature {
  text-align: center;
  padding: 32px 24px;
}

.instant-feature-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.instant-feature h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--teal-dark);
  margin-bottom: 12px;
}

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

.instant-info {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 32px;
}

.instant-info-tag {
  background: var(--bg-light);
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-muted);
}

.instant-info-tag .highlight {
  color: var(--green);
  font-weight: 600;
}

/* ========== 产品展示区 ========== */
.products-section {
  padding: 80px 0;
  background: var(--bg-page);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  background: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  border-top: 5px solid var(--teal-dark);
  border-left: 3px solid var(--gold);
  transition: var(--transition);
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.product-header {
  padding: 24px;
  text-align: center;
  background: linear-gradient(135deg, rgba(21,94,117,0.05), rgba(21,94,117,0.02));
}

.product-icon {
  font-size: 64px;
  margin-bottom: 16px;
}

.product-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--teal-dark);
  margin-bottom: 4px;
}

.product-model {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.product-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  color: var(--teal-dark);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
}

.product-body {
  padding: 24px;
}

.product-features {
  margin-bottom: 20px;
}

.product-features li {
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-body);
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.product-features li::before {
  content: '✓';
  color: var(--green);
  font-weight: bold;
}

.products-footer {
  text-align: center;
  margin-top: 40px;
}

.products-tags {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 20px;
}

.products-tags span {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--teal-dark);
  font-weight: 600;
  font-size: 15px;
}

.products-link {
  color: var(--teal-dark);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.products-link:hover {
  color: var(--gold);
}

/* ========== 为什么选我们 ========== */
.why-section {
  padding: 80px 0;
  background: white;
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.why-item {
  text-align: center;
  padding: 32px 20px;
}

.why-number {
  font-size: 14px;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 16px;
}

.why-icon {
  font-size: 40px;
  margin-bottom: 16px;
}

.why-item h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--teal-dark);
  margin-bottom: 8px;
}

.why-item p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ========== 对比表格 ========== */
.compare-section {
  padding: 80px 0;
  background: var(--bg-page);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

.compare-table th,
.compare-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.compare-table th {
  background: var(--teal-dark);
  color: white;
  font-weight: 600;
  font-size: 15px;
}

.compare-table th:last-child {
  background: var(--gold);
  color: var(--teal-dark);
}

.compare-table td:last-child {
  color: var(--teal-dark);
  font-weight: 600;
}

.compare-table td:first-child {
  font-weight: 600;
  color: var(--text-dark);
}

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

.compare-table tr:hover td {
  background: rgba(21,94,117,0.03);
}

.compare-table .highlight {
  color: var(--green);
}

.compare-conclusion {
  text-align: center;
  margin-top: 32px;
  padding: 20px;
  background: linear-gradient(135deg, rgba(245,158,11,0.1), rgba(16,185,129,0.1));
  border-radius: var(--radius);
  font-weight: 600;
  color: var(--teal-dark);
}

/* ========== 底部CTA ========== */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--teal-gradient-start), var(--teal-gradient-end));
}

.cta-inner {
  text-align: center;
}

.cta-inner .section-title {
  color: white;
  margin-bottom: 24px;
}

.cta-advantages {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 40px;
}

.cta-advantages span {
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.9);
  font-size: 16px;
}

.cta-form {
  max-width: 500px;
  margin: 0 auto 24px;
}

.cta-form-group {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}

.cta-form input {
  flex: 1;
  padding: 14px 18px;
  border: 2px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.1);
  color: white;
  font-size: 15px;
}

.cta-form input::placeholder {
  color: rgba(255,255,255,0.6);
}

.cta-form input:focus {
  outline: none;
  border-color: var(--gold);
}

.cta-form .btn-primary {
  white-space: nowrap;
}

.cta-note {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
}

.cta-note span {
  margin: 0 8px;
}

/* ========== 页脚（深青渐变，首创） ========== */
.footer {
  background: linear-gradient(135deg, var(--teal-gradient-start), var(--teal-gradient-end));
  padding: 60px 0 0;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.footer-main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--gold);
  font-size: 22px;
  font-weight: 700;
}

.footer-logo svg {
  width: 40px;
  height: 40px;
}

.footer-slogan {
  color: rgba(255,255,255,0.8);
  font-size: 15px;
  line-height: 1.7;
}

.footer-links h4 {
  color: white;
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: rgba(255,255,255,0.7);
  font-size: 14px;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--gold);
}

.footer-bottom {
  background: var(--teal-darkest);
  padding: 20px 24px;
  margin: 0 -24px;
  margin-top: 40px;
}

.footer-bottom-inner {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
  color: rgba(255,255,255,0.6);
  font-size: 12px;
  line-height: 1.8;
}

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

.footer-bottom a:hover {
  color: var(--gold);
}

/* ========== 页面标题区 ========== */
.page-hero {
  padding-top: calc(var(--nav-height) + 60px);
  padding-bottom: 60px;
  background: linear-gradient(135deg, var(--teal-gradient-start), var(--teal-gradient-end));
  text-align: right;
}

.page-hero .section-title {
  color: white;
  font-size: 42px;
  margin-bottom: 12px;
}

.page-hero .section-subtitle {
  color: rgba(255,255,255,0.8);
  font-size: 18px;
  margin-bottom: 0;
}

/* ========== 官方直营技术解析 ========== */
.tech-section {
  padding: 80px 0;
  background: white;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.tech-item {
  padding: 32px;
  text-align: center;
}

.tech-item-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.tech-item h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--teal-dark);
  margin-bottom: 12px;
}

.tech-item p {
  color: var(--text-muted);
  line-height: 1.7;
}

.tech-emphasis {
  text-align: center;
  margin-top: 40px;
  padding: 20px;
  background: rgba(21,94,117,0.05);
  border-radius: var(--radius);
  border-left: 4px solid var(--teal-dark);
  color: var(--teal-dark);
  font-weight: 500;
}

/* ========== 4G大机对比 ========== */
.device-compare-section {
  padding: 80px 0;
  background: var(--bg-page);
}

/* ========== 产品详情 ========== */
.product-detail-section {
  padding: 80px 0;
  background: white;
}

.product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 40px;
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  margin-bottom: 32px;
  border-left: 4px solid var(--gold);
}

.product-detail:nth-child(even) {
  direction: rtl;
}

.product-detail:nth-child(even) > * {
  direction: ltr;
}

.product-detail-visual {
  text-align: center;
}

.product-detail-icon {
  font-size: 120px;
  margin-bottom: 20px;
}

.product-detail-tag {
  display: inline-block;
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  color: var(--teal-dark);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  margin-top: 12px;
}

.product-detail-info h3 {
  font-size: 26px;
  font-weight: 700;
  color: var(--teal-dark);
  margin-bottom: 8px;
}

.product-detail-model {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.product-detail-desc {
  font-size: 16px;
  color: var(--text-body);
  margin-bottom: 20px;
}

.product-detail-params {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.param-tag {
  background: var(--bg-light);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-body);
}

/* ========== 参数对比表 ========== */
.specs-section {
  padding: 80px 0;
  background: var(--bg-page);
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

.specs-table th,
.specs-table td {
  padding: 14px 16px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}

.specs-table th {
  background: var(--teal-dark);
  color: white;
  font-weight: 600;
}

.specs-table td:first-child {
  text-align: left;
  font-weight: 600;
  color: var(--text-dark);
}

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

.specs-table tr:hover td {
  background: rgba(21,94,117,0.03);
}

.specs-table .check {
  color: var(--green);
  font-weight: bold;
}

/* ========== 秒到账技术保障 ========== */
.guarantee-section {
  padding: 80px 0;
  background: white;
}

.guarantee-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.guarantee-item {
  padding: 32px;
  text-align: center;
}

.guarantee-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.guarantee-item h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--teal-dark);
  margin-bottom: 12px;
}

.guarantee-item p {
  color: var(--text-muted);
  line-height: 1.7;
}

.guarantee-emphasis {
  text-align: center;
  margin-top: 40px;
  padding: 20px;
  background: linear-gradient(135deg, rgba(245,158,11,0.1), rgba(16,185,129,0.1));
  border-radius: var(--radius);
  font-weight: 500;
  color: var(--teal-dark);
}

/* ========== 秒到账价值 ========== */
.value-section {
  padding: 80px 0;
  background: var(--bg-page);
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.value-item {
  padding: 32px;
  text-align: center;
  border-top: 4px solid var(--gold);
}

.value-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.value-item h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--teal-dark);
  margin-bottom: 12px;
}

.value-item p {
  color: var(--text-muted);
  line-height: 1.7;
}

/* ========== FAQ手风琴 ========== */
.faq-section {
  padding: 80px 0;
  background: white;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

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

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  cursor: pointer;
  font-weight: 600;
  font-size: 16px;
  color: var(--text-dark);
}

.faq-question:hover {
  color: var(--teal-dark);
}

.faq-icon {
  font-size: 20px;
  transition: var(--transition);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 200px;
}

.faq-answer-inner {
  padding-bottom: 20px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ========== 官方直营优势详解 ========== */
.advantage-detail-section {
  padding: 80px 0;
  background: white;
}

.advantage-detail {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.advantage-detail-item {
  padding: 32px;
}

.advantage-detail-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.advantage-detail-item h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--teal-dark);
  margin-bottom: 12px;
}

.advantage-detail-item p {
  color: var(--text-muted);
  line-height: 1.7;
}

/* ========== 官方直营承诺 ========== */
.promise-section {
  padding: 80px 0;
  background: var(--bg-page);
}

.promise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.promise-item {
  padding: 32px;
  border-left: 4px solid var(--gold);
  background: white;
}

.promise-icon {
  font-size: 36px;
  margin-bottom: 16px;
}

.promise-item h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--teal-dark);
  margin-bottom: 12px;
}

.promise-item p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
}

/* ========== 关于页品牌介绍 ========== */
.about-brand-section {
  padding: 80px 0;
  background: white;
}

.about-brand-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  font-size: 18px;
  line-height: 1.9;
  color: var(--text-body);
}

/* ========== 品牌数据 ========== */
.brand-data-section {
  padding: 80px 0;
  background: var(--bg-page);
}

.brand-data-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.brand-data-item {
  text-align: center;
  padding: 40px;
}

.brand-data-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.brand-data-value {
  font-size: 36px;
  font-weight: 800;
  color: var(--teal-dark);
  font-family: 'Barlow', sans-serif;
  margin-bottom: 8px;
}

.brand-data-label {
  font-size: 16px;
  color: var(--text-muted);
}

/* ========== 资质展示 ========== */
.cert-section {
  padding: 80px 0;
  background: white;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.cert-item {
  text-align: center;
  padding: 32px;
  background: var(--bg-page);
  border-radius: var(--radius);
}

.cert-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.cert-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--teal-dark);
}

/* ========== 联系CTA ========== */
.contact-cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--teal-gradient-start), var(--teal-gradient-end));
  text-align: center;
}

.contact-cta-section .section-title {
  color: white;
  margin-bottom: 32px;
}

/* ========== 滚动动画 ========== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* 滚动引导线（深青线条引导） */
.scroll-line {
  position: fixed;
  top: 0;
  left: 0;
  width: 3px;
  height: 0;
  background: linear-gradient(180deg, var(--teal-dark), var(--gold));
  z-index: 1001;
  transition: height 0.1s linear;
}

/* ========== 响应式 ========== */

/* 平板 */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .hero-content {
    text-align: center;
    padding-right: 0;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .hero-visual {
    order: -1;
  }
  
  .hero-device {
    width: 220px;
    height: 300px;
  }
  
  .official-advantages,
  .instant-features,
  .products-grid,
  .why-grid,
  .tech-grid,
  .guarantee-grid,
  .value-grid,
  .advantage-detail,
  .promise-grid,
  .brand-data-grid,
  .cert-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .product-detail {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .product-detail:nth-child(even) {
    direction: ltr;
  }
  
  .footer-main {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

/* 手机 */
@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
  }
  
  .navbar-nav {
    display: none;
  }
  
  .navbar-toggle {
    display: flex;
  }
  
  .hero {
    padding-top: calc(var(--nav-height) + 40px);
    padding-bottom: 60px;
  }
  
  .hero-title {
    font-size: 32px;
  }
  
  .hero-subtitle {
    font-size: 16px;
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: 12px;
  }
  
  .hero-device {
    width: 180px;
    height: 240px;
  }
  
  .hero-device-icon {
    font-size: 70px;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .section-subtitle {
    font-size: 16px;
    margin-bottom: 32px;
  }
  
  .official-advantages,
  .instant-features,
  .products-grid,
  .why-grid,
  .tech-grid,
  .guarantee-grid,
  .value-grid,
  .advantage-detail,
  .promise-grid,
  .brand-data-grid,
  .cert-grid {
    grid-template-columns: 1fr;
  }
  
  .cta-advantages {
    flex-direction: column;
    gap: 12px;
  }
  
  .cta-form-group {
    flex-direction: column;
  }
  
  .page-hero {
    padding-top: calc(var(--nav-height) + 40px);
    padding-bottom: 40px;
  }
  
  .page-hero .section-title {
    font-size: 32px;
  }
  
  .compare-table,
  .specs-table {
    font-size: 13px;
  }
  
  .compare-table th,
  .compare-table td,
  .specs-table th,
  .specs-table td {
    padding: 10px 12px;
  }
  
  .products-tags {
    flex-direction: column;
    gap: 12px;
  }
  
  .instant-info {
    flex-direction: column;
    align-items: center;
  }
}

/* 小屏手机 */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  
  .hero-title {
    font-size: 28px;
  }
  
  .section-title {
    font-size: 24px;
  }
  
  .product-detail {
    padding: 24px;
  }
  
  .product-detail-icon {
    font-size: 80px;
  }
}