/* roulang page: index */
:root {
      --primary: #FF6A2C;
      --primary-hover: #E55A1E;
      --secondary: #1E0F2E;
      --accent: #00E5CC;
      --bg-light: #FAFAFC;
      --bg-dark: #0F0A1A;
      --text-title: #1A1A2E;
      --text-body: #3D3D50;
      --text-muted: #6F6F80;
      --border-light: #E8E8EF;
      --card-shadow: 0 4px 12px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-badge: 20px;
      --radius-input: 8px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', '苹方', system-ui, -apple-system, sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }
    h1, h2, h3 {
      color: var(--text-title);
      font-weight: 700;
      line-height: 1.3;
    }
    h1 { font-size: 40px; }
    h2 { font-size: 32px; }
    h3 { font-size: 22px; font-weight: 600; }
    .section {
      padding: 100px 0;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: #ffffff;
      z-index: 1000;
      box-shadow: 0 1px 0 rgba(0,0,0,0.04);
      transition: box-shadow 0.3s ease;
    }
    .header.scrolled {
      box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--text-title);
      letter-spacing: -0.3px;
    }
    .logo i {
      color: var(--primary);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -2px;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 10px 22px;
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.5px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: background 0.2s, box-shadow 0.2s;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(255,106,44,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      border-radius: var(--radius-btn);
      padding: 10px 22px;
      font-weight: 600;
      font-size: 15px;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }
    .mobile-toggle {
      display: none;
      font-size: 24px;
      color: var(--text-title);
    }
    /* 移动端导航面板 */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 280px;
      height: 100vh;
      background: rgba(30,15,46,0.98);
      backdrop-filter: blur(12px);
      padding: 80px 30px;
      display: flex;
      flex-direction: column;
      gap: 32px;
      transition: right 0.3s ease;
      z-index: 1001;
    }
    .mobile-menu.active {
      right: 0;
    }
    .mobile-menu a {
      color: white;
      font-size: 18px;
      font-weight: 500;
    }
    .mobile-close {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 28px;
      color: white;
    }
    /* Hero */
    .hero {
      padding-top: 120px;
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #FF6A2C 0%, #1E0F2E 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 48px;
      width: 100%;
    }
    .hero-content {
      flex: 1;
      color: white;
    }
    .hero-content h1 {
      color: white;
      font-size: 48px;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1;
      position: relative;
      display: flex;
      justify-content: center;
    }
    .hero-image img {
      max-height: 500px;
      border-radius: 28px;
      box-shadow: 0 24px 48px rgba(0,0,0,0.3);
    }
    .badge-group {
      display: flex;
      gap: 20px;
      margin-top: 32px;
      flex-wrap: wrap;
    }
    .badge {
      background: rgba(0,229,204,0.15);
      backdrop-filter: blur(4px);
      color: white;
      padding: 8px 18px;
      border-radius: var(--radius-badge);
      font-weight: 600;
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    /* 优势卡片错位布局 */
    .features-grid {
      display: flex;
      gap: 32px;
      margin-top: 40px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .feature-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--card-shadow);
      flex: 1 1 280px;
      max-width: 340px;
      position: relative;
      transition: all 0.25s ease;
      border-left: 4px solid var(--primary);
    }
    .feature-card:nth-child(2) {
      margin-top: 30px;
      border-left-color: var(--accent);
    }
    .feature-card:nth-child(3) {
      margin-top: -15px;
      border-left-color: var(--secondary);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
    }
    .feature-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      margin-bottom: 10px;
    }
    .micro-data {
      font-weight: 600;
      color: var(--primary);
      margin-top: 14px;
      font-size: 15px;
    }
    /* 场景图文交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-text {
      flex: 1;
    }
    .scenario-img {
      flex: 1;
    }
    .scenario-img img {
      border-radius: 20px;
      box-shadow: 0 16px 32px rgba(0,0,0,0.08);
    }
    /* 案例卡片滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      margin-top: 32px;
    }
    .case-card {
      min-width: 240px;
      background: white;
      border-radius: var(--radius-card);
      padding: 20px;
      box-shadow: var(--card-shadow);
      border-top: 4px solid var(--accent);
    }
    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .avatar {
      width: 40px;
      height: 40px;
      background: #ddd;
      border-radius: 50%;
      background: var(--primary);
      color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F7F7FC;
      border-radius: 8px;
      margin-top: 8px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 16px;
    }
    /* CTA 全幅 */
    .cta-band {
      background: linear-gradient(135deg, #FF6A2C, #1E0F2E);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .cta-band h2 {
      color: white;
    }
    .footer {
      background: var(--bg-dark);
      color: #B0B0C0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 32px;
    }
    .footer a:hover {
      color: var(--accent);
    }
    @media (max-width: 1024px) {
      .container { padding: 0 20px; }
      .hero-grid { flex-direction: column; text-align: center; }
      .hero-content h1 { font-size: 36px; }
      .scenario-row { flex-direction: column; gap: 30px; }
      .footer-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .section { padding: 60px 0; }
      .features-grid { flex-direction: column; align-items: center; }
      .feature-card:nth-child(2), .feature-card:nth-child(3) { margin-top: 0; }
      .footer-grid { grid-template-columns: 1fr; }
    }