/* roulang page: index */
:root {
      --primary-deep: #0A3D2E;
      --primary-dark: #06241B;
      --accent-orange: #FF6B1A;
      --accent-hover: #E55A0F;
      --gold-spot: #C8963E;
      --bg-warm: #F7F4EF;
      --card-white: #FFFFFF;
      --text-main: #1A1A1A;
      --text-soft: #5C5C5C;
      --text-reverse: #FFFFFF;
      --border-light: rgba(0,0,0,0.04);
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 28px rgba(0,0,0,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --max-width: 1280px;
      --section-gap: 100px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
      --font-number: 'Inter', 'SF Pro Display', 'Helvetica Neue', system-ui;
      font-size: 16px;
      box-sizing: border-box;
    }
    *, *::before, *::after {
      box-sizing: inherit;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10,61,46,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      transition: background 0.3s ease, box-shadow 0.3s;
      box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    }
    .header.scrolled {
      background: var(--primary-deep);
      box-shadow: 0 6px 24px rgba(0,0,0,0.15);
    }
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.5rem;
      color: white;
      letter-spacing: 0.5px;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--accent-orange);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
      font-weight: 500;
      color: rgba(255,255,255,0.9);
    }
    .nav-links a {
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-links a:hover {
      color: var(--accent-orange);
    }
    .btn-download-nav {
      background: var(--accent-orange);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      transition: background 0.2s, transform 0.1s;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      white-space: nowrap;
    }
    .btn-download-nav:hover {
      background: var(--accent-hover);
      transform: scale(1.02);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }
    @media (max-width: 1024px) {
      .nav-links {
        gap: 16px;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--primary-deep);
        flex-direction: column;
        padding: 32px 24px;
        gap: 24px;
        backdrop-filter: blur(12px);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .btn-download-nav {
        margin-left: 0;
      }
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: linear-gradient(135deg, #0A3D2E 0%, #06241B 100%);
      color: white;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      align-items: center;
    }
    .hero-left h1 {
      font-family: var(--font-title);
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-left .sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
    }
    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }
    .btn-primary {
      background: var(--accent-orange);
      border: none;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: 0.2s;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
    }
    .btn-outline.white {
      border-color: white;
      color: white;
    }
    .btn-outline.white:hover {
      background: rgba(255,255,255,0.1);
    }
    .hero-right {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 360px;
      border-radius: 24px;
      position: relative;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
      display: flex;
      align-items: flex-end;
      justify-content: flex-start;
      padding: 20px;
    }
    .odds-badge {
      background: rgba(0,0,0,0.7);
      backdrop-filter: blur(8px);
      color: var(--accent-orange);
      padding: 10px 20px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 1.3rem;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .hero-left h1 {
        font-size: 2.2rem;
      }
      .hero-right {
        min-height: 260px;
      }
    }
    /* 板块间距 */
    section {
      padding: var(--section-gap) 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 12px;
    }
    .section-title p {
      color: var(--text-soft);
    }
    /* 亮点非对称网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      border: 1px solid var(--border-light);
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .highlight-card.wide {
      grid-column: span 2;
    }
    .highlight-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: var(--accent-orange);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(10,61,46,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-deep);
      font-size: 1.5rem;
    }
    .highlight-card h3 {
      font-size: 1.3rem;
      font-weight: 700;
    }
    .metric {
      font-family: var(--font-number);
      font-weight: 700;
      color: var(--accent-orange);
      font-size: 1.8rem;
    }
    @media (max-width: 1024px) {
      .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .highlight-card.wide {
        grid-column: span 2;
      }
    }
    @media (max-width: 640px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
      .highlight-card.wide {
        grid-column: span 1;
      }
    }
    /* 案例瀑布流 */
    .cases-masonry {
      columns: 3 280px;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.2s;
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .case-content {
      padding: 16px;
    }
    .tag {
      background: var(--accent-orange);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 8px;
    }
    .case-card h4 {
      font-weight: 700;
      margin: 8px 0 4px;
    }
    /* 对比 */
    .comparison-block {
      background: var(--primary-dark);
      color: white;
      border-radius: 32px;
      padding: 48px 32px;
    }
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .compare-col {
      background: rgba(255,255,255,0.05);
      border-radius: 20px;
      padding: 24px;
    }
    .compare-col.highlight {
      border: 2px solid var(--primary-deep);
      background: rgba(10,61,46,0.3);
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 14px 0;
      border-bottom: 1px solid rgba(255,255,255,0.15);
    }
    .text-orange {
      color: var(--accent-orange);
    }
    @media (max-width: 768px) {
      .compare-grid {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      border-left: 4px solid var(--primary-deep);
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-soft);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    .faq-item.open .faq-question {
      border-left-color: var(--accent-orange);
    }
    /* CTA */
    .cta-dark {
      background: var(--primary-dark);
      text-align: center;
      padding: 80px 24px;
      color: white;
    }
    .download-btns {
      display: flex;
      justify-content: center;
      gap: 24px;
      flex-wrap: wrap;
      margin: 32px 0;
    }
    .btn-store {
      background: #1E1E1E;
      border: 1px solid #444;
      color: white;
      padding: 14px 32px;
      border-radius: 40px;
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 600;
    }
    footer {
      background: var(--primary-dark);
      color: #ccc;
      padding: 40px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }