/* roulang page: index */
:root {
      --primary: #1A1A1A;
      --accent-gold: #D4AF37;
      --accent-green: #00C897;
      --light-bg: #F5F3EE;
      --card-bg: #FFFFFF;
      --card-border: #E8E5DF;
      --text-dark: #2C2C2C;
      --text-muted: #6B6B6B;
      --white: #FFFFFF;
      --gray-light: #B0B0B0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --radius-xl: 28px;
      --shadow-card: 0 2px 16px rgba(0,0,0,0.04), 0 0 0 1px rgba(0,0,0,0.03);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08), 0 0 0 1px rgba(212,175,55,0.15);
      --shadow-nav: 0 4px 24px rgba(0,0,0,0.2);
      --transition: 0.3s ease;
      --font-title: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-title);
      background-color: var(--white);
      color: var(--text-dark);
      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: color 0.2s;
    }
    .grid-container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 768px) {
      .grid-container {
        padding-left: 16px;
        padding-right: 16px;
      }
      body {
        font-size: 15px;
      }
    }

    /* 浮动Dock导航 */
    #nav {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 720px;
      height: 56px;
      background: rgba(26,26,26,0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: var(--radius-xl);
      box-shadow: var(--shadow-nav);
      border: 1px solid rgba(212,175,55,0.2);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
      transition: background 0.3s;
    }
    #nav.scrolled {
      background: rgba(26,26,26,0.95);
    }
    .nav-logo {
      display: flex;
      align-items: center;
      height: 32px;
      font-weight: 700;
      color: var(--white);
      font-size: 18px;
      letter-spacing: -0.02em;
      white-space: nowrap;
    }
    .nav-logo i {
      color: var(--accent-gold);
      margin-right: 6px;
      font-size: 20px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 24px;
      list-style: none;
      margin: 0;
    }
    .nav-menu a {
      color: var(--gray-light);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--accent-green);
      transition: width 0.25s ease;
    }
    .nav-menu a:hover {
      color: var(--white);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--accent-gold);
      color: var(--primary);
      padding: 8px 20px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 14px;
      transition: background 0.25s, box-shadow 0.25s;
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: #E5C34B;
      box-shadow: 0 4px 14px rgba(212,175,55,0.5);
      color: var(--primary);
    }
    .nav-burger {
      display: none;
      background: none;
      border: none;
      color: var(--white);
      font-size: 24px;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      #nav {
        width: 92%;
        padding: 0 18px;
      }
      .nav-menu {
        display: none;
      }
      .nav-burger {
        display: block;
      }
      .nav-cta.desktop-cta {
        display: none;
      }
    }
    .mobile-menu-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(26,26,26,0.97);
      backdrop-filter: blur(30px);
      z-index: 999;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 28px;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s;
    }
    .mobile-menu-overlay.active {
      opacity: 1;
      pointer-events: auto;
    }
    .mobile-menu-overlay a {
      color: var(--white);
      font-size: 22px;
      font-weight: 600;
      border-bottom: 2px solid transparent;
    }
    .mobile-menu-overlay a:hover {
      border-bottom-color: var(--accent-gold);
    }
    .mobile-close {
      position: absolute;
      top: 20px;
      right: 20px;
      background: none;
      border: none;
      color: var(--white);
      font-size: 30px;
      cursor: pointer;
    }

    /* Hero */
    #hero {
      background: radial-gradient(circle at 30% 30%, #2a2a2a, #0d0d0d);
      padding: 140px 0 100px;
      color: var(--white);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-tag {
      background: var(--accent-green);
      color: var(--white);
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 20px;
    }
    h1 {
      font-size: 48px;
      font-weight: 900;
      line-height: 1.15;
      letter-spacing: -0.02em;
      margin-bottom: 16px;
    }
    h1 .gold {
      color: var(--accent-gold);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--gray-light);
      margin-bottom: 28px;
      max-width: 480px;
    }
    .hero-stats {
      display: flex;
      gap: 32px;
      margin-bottom: 32px;
    }
    .stat-item {
      text-align: left;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 42px;
      font-weight: 800;
      color: var(--accent-gold);
      line-height: 1;
    }
    .stat-label {
      font-size: 14px;
      color: var(--gray-light);
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-gold);
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 16px;
      transition: 0.25s;
      display: inline-block;
    }
    .btn-primary:hover {
      background: #E5C34B;
      box-shadow: 0 6px 20px rgba(212,175,55,0.4);
      color: var(--primary);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 16px;
      transition: 0.25s;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-outline:hover {
      background: var(--accent-gold);
      color: var(--primary);
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 16px;
      height: 380px;
      box-shadow: 0 0 30px rgba(212,175,55,0.15);
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      h1 {
        font-size: 32px;
      }
      .hero-image {
        height: 240px;
      }
    }

    section {
      padding: 100px 0;
    }
    h2 {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 48px;
      position: relative;
      display: inline-block;
    }
    h2::before {
      content: '';
      display: block;
      width: 30px;
      height: 3px;
      background: var(--accent-gold);
      margin-bottom: 12px;
    }

    /* 优势非对称 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .adv-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .adv-card.large {
      grid-row: span 2;
      background: #fafaf8;
    }
    .adv-icon {
      font-size: 40px;
      color: var(--accent-green);
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    /* 功能分组交替 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .feature-row.reverse {
      flex-direction: row-reverse;
    }
    .feature-img {
      flex: 1;
      background: #eae7e2;
      border-radius: var(--radius-md);
      height: 280px;
      background-size: cover;
    }
    .feature-text {
      flex: 1;
    }
    .feature-list {
      list-style: none;
    }
    .feature-list li {
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .feature-list i {
      color: var(--accent-green);
    }

    /* 场景卡片 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .scenario-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .scenario-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .scenario-img {
      height: 200px;
      background-size: cover;
      position: relative;
    }
    .scenario-content {
      padding: 24px;
    }

    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
    }
    .case-card {
      min-width: 320px;
      background: var(--card-bg);
      border-left: 4px solid var(--accent-gold);
      padding: 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
    }

    /* 数据条 */
    #stats {
      background: var(--primary);
      color: white;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
    }

    /* FAQ */
    .accordion-title {
      font-size: 20px;
      font-weight: 600;
      background: white;
      border-bottom: 1px solid var(--card-border);
    }

    /* CTA Banner */
    #cta {
      background: linear-gradient(180deg, #1A1A1A 0%, #0D0D0D 100%);
    }

    footer {
      background: #fafaf8;
      padding: 60px 0 20px;
    }