/* roulang page: index */
:root {
      --red: #E60012;
      --red-hover: #CC0010;
      --deep-black: #0D0F12;
      --cyan: #00C2BA;
      --light-bg: #F5F5F7;
      --card-white: #FFFFFF;
      --success: #1ED45E;
      --warning: #FF6B35;
      --gray-600: #6B7280;
      --gray-400: #9CA3AF;
      --gray-200: #E5E7EB;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-mono: 'Roboto Mono', 'Courier New', monospace;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--light-bg);
      color: #1F2937;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航双层系统 */
    .nav-brand {
      background: #fff;
      border-bottom: 1px solid var(--gray-200);
      height: 56px;
      display: flex;
      align-items: center;
      position: sticky;
      top: 0;
      z-index: 30;
    }
    .brand-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--deep-black);
      text-decoration: none;
    }
    .logo-icon {
      font-size: 1.8rem;
      color: var(--red);
    }
    .brand-actions {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .search-icon {
      font-size: 1.2rem;
      color: var(--gray-600);
      cursor: pointer;
    }
    .btn-small {
      background: var(--red);
      color: white;
      padding: 0.4rem 1.2rem;
      border-radius: 20px;
      font-weight: 600;
      font-size: 0.9rem;
      border: none;
      cursor: pointer;
      transition: background 0.2s;
      text-decoration: none;
    }
    .btn-small:hover {
      background: var(--red-hover);
    }

    .nav-channels {
      background: #F8F8FA;
      border-bottom: 1px solid var(--gray-200);
      height: 44px;
      display: flex;
      align-items: center;
      overflow-x: auto;
      white-space: nowrap;
      scrollbar-width: thin;
      position: sticky;
      top: 56px;
      z-index: 29;
    }
    .channel-pills {
      display: flex;
      gap: 8px;
      padding: 0 8px;
    }
    .pill {
      padding: 0.4rem 1.2rem;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--gray-600);
      background: transparent;
      transition: all 0.2s;
      text-decoration: none;
    }
    .pill.active, .pill:hover {
      background: var(--red);
      color: white;
      font-weight: 600;
    }

    /* Hero */
    #hero {
      position: relative;
      background: linear-gradient(90deg, rgba(13,15,18,0.85) 0%, rgba(13,15,18,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 70vh;
      display: flex;
      align-items: center;
      color: white;
      overflow: hidden;
    }
    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .hero-text {
      flex: 1 1 500px;
      z-index: 2;
    }
    .hero-text h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1rem;
    }
    .hero-text h1 span {
      color: var(--red);
    }
    .hero-sub {
      font-size: 1.25rem;
      margin-bottom: 2rem;
      opacity: 0.9;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--red);
      color: white;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      text-decoration: none;
      transition: 0.2s;
      border: none;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      background: var(--red-hover);
      color: white;
    }
    .btn-outline {
      border: 2px solid var(--cyan);
      color: var(--cyan);
      background: transparent;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      text-decoration: none;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(0,194,186,0.1);
    }

    .hero-video {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .video-placeholder {
      background: rgba(0,0,0,0.5);
      border-radius: 16px;
      width: 100%;
      max-width: 480px;
      aspect-ratio: 16/9;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid rgba(255,255,255,0.2);
    }

    .data-strip {
      background: rgba(0,0,0,0.6);
      backdrop-filter: blur(8px);
      border-radius: 12px;
      display: flex;
      justify-content: space-around;
      padding: 1rem 0;
      margin-top: -3rem;
      position: relative;
      z-index: 5;
      max-width: 900px;
      margin-left: auto;
      margin-right: auto;
      color: white;
    }
    .data-item {
      text-align: center;
    }
    .data-num {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 700;
      color: var(--cyan);
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 2.5rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 4px;
      background: var(--red);
    }

    .cards-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      border-bottom: 4px solid transparent;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-bottom-color: var(--red);
    }
    .service-icon {
      font-size: 2rem;
      color: var(--cyan);
      margin-bottom: 1rem;
    }

    .advantage-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
      margin-bottom: 80px;
    }
    .adv-text, .adv-img {
      flex: 1 1 400px;
    }
    .adv-img img {
      width: 100%;
      border-radius: 16px;
    }
    .big-number {
      font-family: var(--font-mono);
      font-size: 3rem;
      font-weight: 700;
      color: var(--cyan);
    }

    .scroll-cases {
      display: flex;
      overflow-x: auto;
      gap: 20px;
      padding-bottom: 1rem;
      scrollbar-width: thin;
    }
    .case-card {
      flex: 0 0 300px;
      background: white;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border-left: 6px solid var(--red);
    }
    .case-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }

    .steps {
      display: flex;
      justify-content: space-between;
      text-align: center;
    }

    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .accordion-item {
      background: white;
      border-radius: 8px;
      margin-bottom: 8px;
    }
    .accordion-title {
      font-weight: 600;
    }

    #cta {
      background: linear-gradient(135deg, #0D0F12 0%, #2d1a1c 100%), url('/assets/images/backpic/back-2.webp') center/cover;
      background-blend-mode: overlay;
      padding: 4rem 0;
      text-align: center;
      color: white;
    }

    footer {
      background: #0D0F12;
      color: #ccc;
      padding: 3rem 0 1.5rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .cards-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 640px) {
      .cards-grid { grid-template-columns: 1fr; }
      .hero-text h1 { font-size: 2.2rem; }
      .faq-grid { grid-template-columns: 1fr; }
      .steps { flex-direction: column; gap: 30px; }
    }