/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --primary-dark: #1A1F3A;
      --accent-gold: #D4AF37;
      --accent-red: #FF3D2E;
      --bg-card: #1E2240;
      --text-white: #ffffff;
      --text-light: rgba(255, 255, 255, 0.7);
      --text-muted: rgba(255, 255, 255, 0.5);
      --border-gold-dim: rgba(212, 175, 55, 0.15);
      --border-glow: rgba(212, 175, 55, 0.3);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-title: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
      --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Inter", "Roboto", sans-serif;
      --transition-smooth: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      padding: 0;
      background: var(--primary-deep);
      background: linear-gradient(180deg, #0A0E27 0%, #1A1F3A 100%);
      font-family: var(--font-body);
      color: var(--text-white);
      line-height: 1.6;
      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: var(--font-body);
      border: none;
      outline: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition-smooth);
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(10, 14, 39, 0.95);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 100;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(212, 175, 55, 0.2);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-title);
      font-weight: 900;
      font-size: 1.8rem;
      color: var(--text-white);
    }

    .logo i {
      color: var(--accent-gold);
      font-size: 2rem;
      filter: drop-shadow(0 0 6px rgba(212, 175, 55, 0.6));
    }

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

    .desktop-nav a {
      color: var(--text-light);
      font-weight: 500;
      font-size: 1rem;
      padding: 8px 0;
      position: relative;
    }

    .desktop-nav a:hover {
      color: var(--accent-gold);
    }

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

    .desktop-nav a:hover::after {
      width: 100%;
    }

    .btn-gold {
      background: linear-gradient(135deg, #D4AF37 0%, #B8960F 100%);
      color: #0A0E27;
      font-weight: 800;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-size: 0.95rem;
      letter-spacing: 0.5px;
      box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3);
    }

    .btn-gold:hover {
      background: var(--accent-red);
      color: white;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255, 61, 46, 0.5);
    }

    .mobile-menu-toggle {
      display: none;
      background: transparent;
      color: var(--accent-gold);
      font-size: 1.8rem;
    }

    /* 移动端底部导航 */
    .bottom-tab-bar {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: #0A0E27;
      border-top: 1px solid rgba(212, 175, 55, 0.25);
      z-index: 99;
      padding: 8px 16px;
      justify-content: space-around;
      align-items: center;
    }

    .tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      font-size: 0.7rem;
      transition: 0.2s;
    }

    .tab-item i {
      font-size: 1.4rem;
      margin-bottom: 2px;
    }

    .tab-item.active {
      color: var(--accent-gold);
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      margin-top: 0;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at center, rgba(10,14,39,0.4) 0%, rgba(10,14,39,0.9) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      margin-top: 40px;
    }

    .hero h1 {
      font-family: var(--font-title);
      font-weight: 900;
      font-size: clamp(2.8rem, 7vw, 4.5rem);
      color: white;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      text-shadow: 0 8px 24px rgba(0,0,0,0.7);
    }

    .hero .subtitle {
      color: var(--accent-gold);
      font-size: 1.25rem;
      opacity: 0.9;
      margin-bottom: 2.5rem;
      font-weight: 500;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-outline-gold {
      background: transparent;
      border: 2px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
    }

    .btn-outline-gold:hover {
      background: var(--accent-gold);
      color: #0A0E27;
      border-color: var(--accent-gold);
    }

    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: var(--accent-gold);
      font-size: 2rem;
      animation: pulseGold 1.8s infinite;
    }

    @keyframes pulseGold {
      0% { opacity: 0.7; transform: translateX(-50%) translateY(0); }
      50% { opacity: 1; transform: translateX(-50%) translateY(8px); }
      100% { opacity: 0.7; transform: translateX(-50%) translateY(0); }
    }

    section {
      padding: 80px 0;
    }

    .section-title {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 2.4rem;
      margin-bottom: 2.5rem;
      text-align: center;
      color: white;
    }

    .section-title span {
      color: var(--accent-gold);
    }

    /* 核心优势不对称栅格 */
    .advantage-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 28px;
    }

    .adv-card {
      background: var(--bg-card);
      border: 1px solid var(--border-gold-dim);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      display: flex;
      align-items: flex-start;
      gap: 24px;
      transition: 0.25s;
    }

    .adv-card:hover {
      border-color: var(--accent-gold);
      box-shadow: 0 0 20px rgba(212, 175, 55, 0.3);
    }

    .adv-icon {
      font-size: 3.5rem;
      color: var(--accent-gold);
    }

    .adv-text h3 {
      font-weight: 700;
      font-size: 1.5rem;
      color: white;
    }

    .adv-text p {
      color: var(--text-light);
      margin: 0;
    }

    /* 产品功能选项卡 */
    .feature-tabs {
      display: flex;
      gap: 40px;
      align-items: flex-start;
    }

    .tab-nav {
      display: flex;
      flex-direction: column;
      min-width: 200px;
      border-left: 2px solid rgba(212,175,55,0.3);
    }

    .tab-link {
      padding: 16px 24px;
      font-weight: 600;
      color: var(--text-light);
      cursor: pointer;
      transition: 0.2s;
      border-left: 3px solid transparent;
      margin-left: -2px;
    }

    .tab-link.active {
      color: var(--accent-gold);
      border-left-color: var(--accent-gold);
      background: rgba(212,175,55,0.05);
    }

    .tab-content {
      flex: 1;
      display: flex;
      gap: 30px;
      align-items: center;
    }

    .tab-content img {
      width: 48%;
      border-radius: 16px;
    }

    /* 场景网格 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .scenario-item {
      position: relative;
      border-radius: 16px;
      overflow: hidden;
      aspect-ratio: 16/9;
      background-size: cover;
    }

    .scenario-item img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }

    .scenario-item:hover img {
      transform: scale(1.05);
    }

    .scenario-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(0deg, rgba(10,14,39,0.8) 0%, transparent 60%);
      display: flex;
      align-items: flex-end;
      padding: 28px;
      font-size: 2rem;
      font-weight: 800;
    }

    /* 横向滚动案例 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scroll-snap-type: x mandatory;
    }

    .case-card {
      flex: 0 0 calc(33.333% - 20px);
      min-width: 280px;
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 28px;
      border: 1px solid var(--border-gold-dim);
      scroll-snap-align: start;
    }

    .case-card:hover {
      border-color: var(--accent-gold);
      box-shadow: 0 0 20px var(--border-glow);
    }

    .case-number {
      font-size: 2.4rem;
      font-weight: 900;
      color: var(--accent-gold);
    }

    /* FAQ手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .accordion-item {
      background: var(--bg-card);
      border-radius: 12px;
      margin-bottom: 12px;
      border: 1px solid var(--border-gold-dim);
    }

    .accordion-title {
      padding: 20px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .accordion-content {
      padding: 0 20px 20px;
      color: var(--text-light);
    }

    /* CTA */
    .cta-block {
      background: linear-gradient(135deg, #D4AF37 0%, #1A1F3A 100%);
      padding: 80px 24px;
      text-align: center;
      border-radius: 28px;
      margin: 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding-top: 60px;
    }

    @media (max-width: 1024px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .bottom-tab-bar {
        display: flex;
      }
      .advantage-grid {
        grid-template-columns: 1fr 1fr;
      }
      .feature-tabs {
        flex-direction: column;
      }
      .tab-nav {
        flex-direction: row;
        border-left: none;
        border-bottom: 2px solid rgba(212,175,55,0.3);
      }
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 640px) {
      .advantage-grid, .scenario-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }