/* roulang page: index */
:root {
      --primary: #0A1F2E;
      --secondary: #E85D04;
      --accent: #00C9A7;
      --bg: #F5F0EB;
      --card-bg: rgba(255, 255, 255, 0.7);
      --text: #1A1A1A;
      --text-heading: #0A1F2E;
      --text-muted: #5C5C5C;
      --border-light: rgba(255, 255, 255, 0.3);
      --shadow-sm: 0 8px 32px rgba(10, 31, 46, 0.08);
      --shadow-hover: 0 12px 40px rgba(10, 31, 46, 0.15);
      --radius-lg: 16px;
      --radius-btn: 50px;
      --font-sans: 'Noto Sans SC', sans-serif;
      --font-inter: 'Inter', 'Noto Sans SC', sans-serif;
      --transition: 0.3s ease;
      --container-max: 1200px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input {
      font-family: inherit;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 吸顶导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
    }

    .header.scrolled {
      background: rgba(245, 240, 235, 0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    }

    .nav-container {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      padding: 16px 0;
      max-width: var(--container-max);
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo i {
      font-size: 28px;
      color: var(--secondary);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      flex-wrap: wrap;
    }

    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--primary);
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: width 0.3s;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .hot-tags {
      display: flex;
      gap: 12px;
      align-items: center;
      margin-left: 20px;
    }

    .tag {
      background: rgba(232, 93, 4, 0.1);
      color: var(--secondary);
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 500;
      white-space: nowrap;
    }

    .search-icon {
      cursor: pointer;
      font-size: 18px;
      color: var(--primary);
      margin-left: 12px;
      transition: color 0.2s;
    }

    .search-icon:hover {
      color: var(--secondary);
    }

    .search-bar {
      display: none;
      position: absolute;
      top: 70px;
      right: 24px;
      background: white;
      border-radius: 30px;
      box-shadow: var(--shadow-sm);
      padding: 8px 20px;
      width: 260px;
    }

    .search-bar.active {
      display: flex;
      align-items: center;
    }

    .search-bar input {
      border: none;
      outline: none;
      width: 100%;
      padding: 8px 0;
      font-size: 14px;
    }

    .hamburger {
      display: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--primary);
    }

    @media (max-width: 1024px) {
      .nav-links, .hot-tags {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(10,31,46,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 32px;
        z-index: 999;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        color: white;
        font-size: 20px;
        font-weight: 500;
      }
    }

    /* Hero */
    .hero {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 180px 0 120px;
      color: white;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10, 31, 46, 0.85);
      z-index: 1;
    }

    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .hero-content {
      flex: 1 1 50%;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 24px;
    }

    .hero .subtitle {
      font-size: 18px;
      opacity: 0.8;
      margin-bottom: 40px;
    }

    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn {
      display: inline-block;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: all 0.3s ease;
      text-align: center;
      cursor: pointer;
    }

    .btn-primary {
      background: var(--secondary);
      color: white;
      border: none;
      box-shadow: 0 0 24px rgba(232, 93, 4, 0.5);
    }

    .btn-primary:hover {
      background: #C94D00;
      box-shadow: 0 0 30px rgba(232, 93, 4, 0.7);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
    }

    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
    }

    .hero-image {
      flex: 1 1 40%;
      border-radius: 24px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.3);
      backdrop-filter: blur(10px);
      box-shadow: var(--shadow-sm);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 1;
      pointer-events: none;
      background: radial-gradient(circle at 20% 50%, rgba(232,93,4,0.2) 0%, transparent 50%);
      animation: glowPulse 4s infinite alternate;
    }

    @keyframes glowPulse {
      0% { opacity: 0.5; }
      100% { opacity: 0.9; }
    }

    @media (max-width: 768px) {
      .hero {
        padding: 140px 0 80px;
      }
      .hero h1 {
        font-size: 32px;
      }
      .hero .subtitle {
        font-size: 16px;
      }
      .hero .container {
        flex-direction: column;
      }
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-heading);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-sub {
      color: var(--text-muted);
      text-align: center;
      margin-bottom: 60px;
      font-size: 18px;
    }

    .grid-4, .grid-3, .grid-2 {
      display: grid;
      gap: 24px;
    }

    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-2 { grid-template-columns: repeat(2, 1fr); }

    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 640px) {
      .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
    }

    .glass-card {
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.3);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(0, 201, 167, 0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--accent);
      font-size: 28px;
    }

    .card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--text-heading);
    }

    .feature-list {
      list-style: none;
      margin-top: 16px;
    }

    .feature-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 10px;
      color: var(--text-muted);
    }

    .feature-list i {
      color: var(--accent);
    }

    .scenario-card {
      background: #EDE7E0;
      border-radius: var(--radius-lg);
      overflow: hidden;
    }

    .scenario-card img {
      height: 200px;
      width: 100%;
      object-fit: cover;
    }

    .scenario-content {
      padding: 24px;
    }

    .stats-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--secondary);
      line-height: 1.2;
    }

    .faq-item {
      border-bottom: 1px solid rgba(10,31,46,0.08);
      padding: 20px 0;
    }

    .faq-question {
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-heading);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 16px;
    }

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

    .cta-dark {
      background: var(--primary);
      color: white;
      text-align: center;
    }

    .trust-badges {
      display: flex;
      justify-content: center;
      gap: 40px;
      margin-top: 32px;
      opacity: 0.6;
    }

    footer {
      background: #061520;
      color: rgba(255,255,255,0.6);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }