/* roulang page: index */
:root {
      --primary: #E43D22;
      --primary-hover: #c5301a;
      --secondary: #1A1A2E;
      --accent: #F5A623;
      --bg: #F9F9FB;
      --text: #333;
      --text-light: #666;
      --text-dark: #111;
      --white: #ffffff;
      --border: #E8E8EC;
      --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.10);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-xs: 6px;
      --transition: 0.25s ease;
      --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", -apple-system, sans-serif;
      --container-max: 1200px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      scroll-padding-top: 120px;
    }
    body {
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text);
      background-color: var(--bg);
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 28px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    /* 导航 */
    .nav-brand {
      background: var(--white);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      height: 56px;
      display: flex;
      align-items: center;
      position: sticky;
      top: 0;
      z-index: 50;
    }
    .nav-brand .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--text-dark);
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 14px;
    }
    .nav-actions a {
      color: var(--text);
      font-weight: 500;
      font-size: 15px;
      margin-left: 24px;
      transition: color var(--transition);
    }
    .nav-actions a:hover {
      color: var(--primary);
    }
    .channel-bar {
      background: var(--white);
      border-bottom: 1px solid var(--border);
      padding: 10px 0;
      position: sticky;
      top: 56px;
      z-index: 40;
    }
    .channel-list {
      display: flex;
      gap: 28px;
      list-style: none;
      overflow-x: auto;
      white-space: nowrap;
      scrollbar-width: none;
    }
    .channel-list::-webkit-scrollbar {
      display: none;
    }
    .channel-list a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-light);
      padding-bottom: 6px;
      border-bottom: 3px solid transparent;
      transition: color var(--transition), border-color var(--transition);
      position: relative;
    }
    .channel-list a:hover,
    .channel-list a.active {
      color: var(--text-dark);
      border-bottom-color: var(--primary);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-dark);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .channel-bar .container {
        justify-content: flex-end;
      }
      .channel-list {
        display: none;
        flex-direction: column;
        position: fixed;
        top: 0;
        right: 0;
        width: 260px;
        height: 100vh;
        background: var(--white);
        box-shadow: -4px 0 20px rgba(0,0,0,0.1);
        padding: 80px 24px 40px;
        z-index: 100;
        gap: 20px;
        transition: transform 0.3s ease;
        transform: translateX(100%);
      }
      .channel-list.open {
        display: flex;
        transform: translateX(0);
      }
      .mobile-menu-toggle {
        display: block;
        z-index: 110;
      }
      .nav-brand .nav-actions {
        display: none;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #E43D22 0%, #C5301A 100%);
      color: white;
      padding: 60px 0 80px;
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 48px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 50%;
    }
    .hero h1 {
      font-size: clamp(36px, 5vw, 52px);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 28px;
      max-width: 500px;
    }
    .badge-row {
      display: flex;
      gap: 24px;
      margin-bottom: 32px;
      flex-wrap: wrap;
    }
    .stat-badge {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(4px);
      border-radius: var(--radius-md);
      padding: 14px 22px;
      text-align: center;
    }
    .stat-number {
      font-family: 'Inter', sans-serif;
      font-weight: 800;
      font-size: 36px;
      background: linear-gradient(180deg, #F5A623 0%, #E43D22 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .stat-label {
      font-size: 14px;
      color: rgba(255,255,255,0.8);
      margin-top: 4px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-block;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      transition: all var(--transition);
      cursor: pointer;
      border: 2px solid transparent;
    }
    .btn-primary {
      background: var(--white);
      color: var(--primary);
      border-color: var(--white);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      color: white;
      border-color: var(--primary-hover);
    }
    .btn-outline {
      background: transparent;
      color: white;
      border-color: rgba(255,255,255,0.7);
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }
    .hero-image {
      flex: 1 1 40%;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      background: rgba(0,0,0,0.2);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
      }
      .hero-image {
        width: 100%;
        aspect-ratio: 16/9;
      }
    }
    /* 通用板块 */
    .section {
      padding: 80px 0;
    }
    .section h2 {
      font-size: clamp(28px, 4vw, 36px);
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-light);
      font-size: 18px;
      margin-bottom: 48px;
    }
    /* 核心优势 左大右小 */
    .advantage-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .adv-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 28px;
      border-left: 4px solid var(--primary);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .adv-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
      border-left-width: 8px;
    }
    .adv-card.large {
      grid-row: span 2;
    }
    .adv-icon {
      font-size: 32px;
      margin-bottom: 16px;
    }
    .adv-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .adv-highlight {
      font-family: 'Inter', sans-serif;
      font-weight: 700;
      font-size: 28px;
      color: var(--primary);
      margin-top: 16px;
    }
    @media (max-width: 768px) {
      .advantage-grid {
        grid-template-columns: 1fr;
      }
      .adv-card.large {
        grid-row: span 1;
      }
    }
    /* 功能矩阵 */
    .matrix-group {
      margin-bottom: 48px;
    }
    .matrix-group h3 {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 20px;
      color: var(--secondary);
    }
    .matrix-cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .func-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border);
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
    }
    .func-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .func-icon {
      font-size: 28px;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .func-card h4 {
      font-weight: 600;
      margin-bottom: 8px;
    }
    .tag {
      display: inline-block;
      background: var(--secondary);
      color: white;
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 20px;
      margin-top: 10px;
      font-weight: 500;
    }
    @media (max-width: 992px) {
      .matrix-cards {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .matrix-cards {
        grid-template-columns: 1fr;
      }
    }
    /* 场景卡片流 */
    .scene-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .scene-card {
      flex: 0 0 340px;
      background: var(--white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      scroll-snap-align: start;
      transition: all 0.3s ease;
      border: 1px solid var(--border);
    }
    .scene-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .scene-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .scene-body {
      padding: 20px;
    }
    .scene-body h4 {
      font-weight: 600;
      margin-bottom: 8px;
    }
    .arrow-solution {
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--primary);
      font-weight: 600;
      margin: 12px 0;
    }
    @media (max-width: 640px) {
      .scene-card {
        flex: 0 0 85vw;
      }
    }
    /* 数据墙 */
    .data-wall {
      background: linear-gradient(135deg, #1A1A2E 0%, #16213E 100%);
      color: white;
      padding: 80px 0;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
      margin-bottom: 48px;
    }
    .stat-item .number {
      font-family: 'Inter', sans-serif;
      font-weight: 800;
      font-size: 48px;
      background: linear-gradient(180deg, #F5A623, #E43D22);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .logo-wall {
      display: flex;
      justify-content: center;
      gap: 40px;
      flex-wrap: wrap;
      margin: 32px 0;
      opacity: 0.7;
    }
    .logo-placeholder {
      width: 70px;
      height: 70px;
      background: #2a2a3a;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
      color: #aaa;
    }
    .testimonial {
      font-style: italic;
      text-align: center;
      max-width: 600px;
      margin: 0 auto;
      font-size: 18px;
      opacity: 0.9;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      overflow: hidden;
    }
    .faq-question {
      display: flex;
      align-items: center;
      padding: 18px 20px;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      color: var(--text-dark);
    }
    .faq-question .q-icon {
      color: var(--primary);
      margin-right: 12px;
      font-weight: 700;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: #fafafa;
      padding: 0 20px;
      border-left: 2px solid var(--primary);
      margin-left: 32px;
      color: #555;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 16px 20px;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #E43D22, #C5301A);
      padding: 80px 0;
      color: white;
      text-align: center;
    }
    .cta-form {
      display: flex;
      justify-content: center;
      gap: 12px;
      margin-top: 32px;
      flex-wrap: wrap;
    }
    .cta-input {
      padding: 14px 20px;
      border-radius: var(--radius-sm);
      border: none;
      width: 280px;
      font-size: 16px;
      box-shadow: inset 0 2px 6px rgba(0,0,0,0.05);
    }
    .btn-accent {
      background: var(--accent);
      color: #1a1a2e;
      font-weight: 700;
      padding: 14px 32px;
    }
    .btn-accent:hover {
      background: #e5941f;
    }
    /* 页脚 */
    .footer {
      background: #111;
      color: #ccc;
      padding: 32px 0;
      font-size: 15px;
    }
    .footer .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }
    .footer-links a {
      color: #ccc;
      margin-left: 24px;
      transition: color var(--transition);
    }
    .footer-links a:hover {
      color: white;
    }
    @media (max-width: 768px) {
      .footer .container {
        flex-direction: column;
        text-align: center;
      }
    }
    .overlay {
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.4);
      z-index: 99;
      display: none;
    }
    .overlay.show {
      display: block;
    }