/* roulang page: index */
:root {
      --primary-orange: #F15A24;
      --primary-dark: #D94A1A;
      --deep-black: #1C1C1E;
      --dark-surface: #2D2D30;
      --track-gray: #F2F2F4;
      --gray-deep: #E8E8EB;
      --white: #FFFFFF;
      --accent-neon: #C7F464;
      --body-text: #333333;
      --muted-text: #6B6B6F;
      --border-light: #E3E3E6;
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.1);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --transition-smooth: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--track-gray);
      color: var(--body-text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, .button {
      cursor: pointer;
      font-family: inherit;
    }

    .grid-container {
      max-width: 1200px;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航系统 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--deep-black);
      color: white;
      box-shadow: 0 2px 12px rgba(0,0,0,0.15);
    }

    .nav-top-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.85rem 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .brand-logo {
      font-size: 1.7rem;
      font-weight: 700;
      letter-spacing: 1px;
      color: white;
      display: flex;
      align-items: center;
      gap: 0.4rem;
    }
    .brand-logo i {
      color: var(--primary-orange);
      font-size: 1.9rem;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1.2rem;
    }
    .search-icon {
      font-size: 1.25rem;
      color: #ccc;
      transition: color 0.2s;
    }
    .search-icon:hover {
      color: var(--primary-orange);
    }

    .btn-primary-nav {
      background: var(--primary-orange);
      color: white;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      border: none;
      white-space: nowrap;
      transition: var(--transition-smooth);
      display: inline-block;
    }
    .btn-primary-nav:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
      color: white;
    }

    .channel-tabs {
      display: flex;
      gap: 0.25rem;
      padding: 0.6rem 0;
      overflow-x: auto;
      white-space: nowrap;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
    }
    .channel-tabs::-webkit-scrollbar {
      display: none;
    }

    .pill-tab {
      background: transparent;
      color: #ccc;
      padding: 0.5rem 1.2rem;
      border-radius: 40px;
      font-weight: 500;
      font-size: 0.95rem;
      transition: var(--transition-smooth);
      border: none;
      display: inline-block;
    }
    .pill-tab:hover {
      background: rgba(255,255,255,0.1);
      color: white;
    }
    .pill-tab.active {
      background: var(--primary-orange);
      color: white;
      font-weight: 600;
    }

    /* 移动端汉堡 */
    .hamburger-btn {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #1C1C1E 0%, #2D2D30 100%);
      position: relative;
      overflow: hidden;
      color: white;
      padding: 4rem 0;
    }
    .hero-bg-lines {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: repeating-linear-gradient(45deg, rgba(241,90,36,0.08) 0px, rgba(241,90,36,0.08) 2px, transparent 2px, transparent 12px);
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 2.5rem;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1;
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.15;
      margin-bottom: 1.5rem;
      color: white;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #ccc;
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-solid {
      background: var(--primary-orange);
      color: white;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      transition: var(--transition-smooth);
    }
    .btn-solid:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
      color: white;
    }
    .btn-outline {
      border: 2px solid white;
      color: white;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
      transition: var(--transition-smooth);
    }
    .btn-outline:hover {
      background: white;
      color: var(--deep-black);
    }

    .hero-image {
      flex: 1;
      position: relative;
    }
    .hero-image img {
      border-radius: 20px;
      clip-path: polygon(5% 0%, 100% 0%, 95% 100%, 0% 100%);
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }

    /* 区块通用 */
    .section {
      padding: 5rem 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: var(--deep-black);
    }
    .section-sub {
      color: var(--muted-text);
      margin-bottom: 2.5rem;
    }

    /* 卡片 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      height: 100%;
    }
    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }

    .icon-circle {
      background: #FDE8DF;
      width: 60px;
      height: 60px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.5rem;
      color: var(--primary-orange);
      font-size: 1.8rem;
    }

    .advantage-card h3 {
      font-size: 1.4rem;
      font-weight: 600;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }

    .product-card img {
      height: 200px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 1.2rem;
    }

    .scenario-card {
      text-align: center;
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem 1.2rem;
    }

    .stats-block {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 2rem;
      background: var(--deep-black);
      color: white;
      padding: 3rem 2rem;
      border-radius: var(--radius-card);
    }
    .stat-item h3 {
      font-size: 2.5rem;
      color: var(--primary-orange);
      font-weight: 700;
    }

    .faq-accordion .accordion-item {
      margin-bottom: 0.8rem;
      border-radius: 8px;
      overflow: hidden;
    }

    .cta-banner {
      background: var(--primary-orange);
      border-radius: var(--radius-card);
      padding: 3.5rem 2rem;
      text-align: center;
      color: white;
    }

    .footer {
      background: var(--deep-black);
      color: #bbb;
      padding: 3rem 0 1.5rem;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .grid-3 { grid-template-columns: 1fr; }
      .hero-grid { flex-direction: column; }
      .hero-title { font-size: 2rem; }
      .hamburger-btn { display: block; }
      .channel-tabs { display: none; }
      .channel-tabs.mobile-open {
        display: flex;
        flex-direction: column;
        background: var(--deep-black);
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        padding: 1rem;
      }
    }