/* roulang page: index */
:root {
      --primary-deep: #0B1A2E;
      --primary-blue: #3B6FA0;
      --accent-orange: #F15A24;
      --accent-gold: #F7C948;
      --bg-light: #F7F9FC;
      --bg-white: #FFFFFF;
      --bg-soft: #EDF2F7;
      --text-dark: #0B1A2E;
      --text-body: #4A5568;
      --text-muted: #718096;
      --text-light: #A0B4CC;
      --white: #FFFFFF;
      --shadow-card: 0 8px 24px rgba(11, 26, 46, 0.06);
      --shadow-hover: 0 16px 32px rgba(11, 26, 46, 0.12);
      --radius-card: 20px;
      --radius-btn: 12px;
      --radius-sm: 10px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --font-number: "DIN Alternate", "PingFang SC", sans-serif;
      --transition: 0.3s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg-light);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
      font-weight: 600;
    }
    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      height: 76px;
      display: flex;
      align-items: center;
      transition: background 0.3s, box-shadow 0.3s;
      background: transparent;
    }
    .nav-bar.scrolled {
      background: var(--white);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--white);
      transition: color 0.3s;
    }
    .nav-bar.scrolled .logo {
      color: var(--primary-deep);
    }
    .logo-icon {
      font-size: 2rem;
      color: var(--accent-gold);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
      color: rgba(255,255,255,0.9);
      transition: color 0.3s;
    }
    .nav-bar.scrolled .nav-menu {
      color: var(--text-dark);
    }
    .nav-menu a {
      font-size: 0.95rem;
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }
    .nav-menu a:hover {
      border-bottom-color: var(--accent-orange);
    }
    .nav-cta {
      background: var(--accent-orange);
      color: white;
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      margin-left: 16px;
      transition: 0.25s;
    }
    .nav-cta:hover {
      background: #d94318;
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      background: none;
      color: white;
    }
    .nav-bar.scrolled .hamburger {
      color: var(--primary-deep);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--primary-deep);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 28px;
      z-index: 99;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.5rem;
    }
    /* Hero */
    .hero {
      min-height: 95vh;
      background: linear-gradient(135deg, #0B1A2E 0%, #132B44 100%);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      display: flex;
      align-items: center;
      color: white;
      padding-top: 90px;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 20% 30%, rgba(247,201,72,0.08) 0%, transparent 50%);
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 3.4rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }
    .hero p {
      font-size: 1.2rem;
      color: var(--text-light);
      margin-bottom: 2.5rem;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      padding: 16px 36px;
      border-radius: 40px;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: #d94318;
      box-shadow: 0 10px 20px rgba(241,90,36,0.3);
    }
    .btn-ghost {
      border: 2px solid white;
      background: transparent;
      color: white;
      padding: 16px 36px;
      border-radius: 40px;
    }
    .btn-ghost:hover {
      background: white;
      color: var(--primary-deep);
    }
    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--text-dark);
    }
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--white);
      padding: 32px 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 2.4rem;
      color: var(--accent-orange);
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
      color: var(--text-dark);
    }
    /* 产品展示 */
    .product-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .product-row.reverse {
      flex-direction: row-reverse;
    }
    .product-img {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
    }
    .product-text {
      flex: 1;
    }
    .product-text h3 {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 18px;
    }
    .check-list {
      list-style: none;
      margin-top: 20px;
    }
    .check-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 12px;
    }
    /* 场景卡片 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .scenario-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .scenario-img {
      height: 200px;
      background-size: cover;
    }
    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      min-width: 300px;
      background: #f2f5f9;
      border-radius: 20px;
      padding: 24px;
      scroll-snap-align: start;
    }
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 14px;
      margin-bottom: 16px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-dark);
    }
    .faq-answer {
      padding: 0 28px 20px;
      color: var(--text-body);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0B1A2E, #1A3A5C);
      text-align: center;
      color: white;
    }
    .footer {
      background: #0B1A2E;
      color: #A0B4CC;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .features-grid, .scenario-grid { grid-template-columns: repeat(2,1fr); }
      .product-row { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .features-grid, .scenario-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 2.4rem; }
      .footer-grid { grid-template-columns: 1fr; }
    }