/* roulang page: index */
:root {
      --primary-deep: #0B1E3F;
      --accent-gold: #D4A853;
      --accent-gold-dark: #B8913A;
      --bg-warm: #F7F5F0;
      --text-dark: #1F2A3A;
      --text-body: #3A3A3A;
      --text-muted: #6B6B6B;
      --text-light: #9BA3B0;
      --white: #FFFFFF;
      --card-glass-bg: rgba(255, 255, 255, 0.7);
      --card-border: rgba(212, 168, 83, 0.2);
      --card-shadow: 0 8px 32px rgba(11, 30, 63, 0.08);
      --card-shadow-hover: 0 16px 40px rgba(11, 30, 63, 0.15);
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-inner: 12px;
      --font-sans: "HarmonyOS Sans", "PingFang SC", "Microsoft YaHei", "Inter", system-ui, -apple-system, sans-serif;
      --transition-smooth: 0.3s cubic-bezier(0.2, 0.0, 0, 1);
      --container-max: 1280px;
      --section-gap: 100px;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-warm);
    }

    body {
      font-family: var(--font-sans);
      line-height: 1.7;
      color: var(--text-body);
      background-color: var(--bg-warm);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
      width: 100%;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

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

    /* 导航 - 桌面沉浸式半透明 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(11, 30, 63, 0.88);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(212, 168, 83, 0.25);
      transition: background 0.4s;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: baseline;
      gap: 6px;
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 0.5px;
      color: #FFFFFF;
    }
    .logo .brand {
      color: var(--accent-gold);
    }
    .logo .sub {
      font-size: 0.75rem;
      font-weight: 400;
      color: #cfd8e6;
      margin-left: 4px;
      letter-spacing: 0.3px;
    }

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

    .nav-link {
      color: #e0e4ed;
      font-size: 0.95rem;
      font-weight: 500;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--accent-gold);
    }
    .nav-link::after {
      content: "";
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.3s ease;
    }
    .nav-link:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: linear-gradient(145deg, var(--accent-gold), var(--accent-gold-dark));
      color: #FFFFFF;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      border: none;
      box-shadow: 0 0 18px rgba(212, 168, 83, 0.35);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.4px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(212, 168, 83, 0.75);
      transform: translateY(-2px);
      background: linear-gradient(145deg, #E0B85F, #C79E44);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 11px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.3s;
      display: inline-flex;
      align-items: center;
    }
    .btn-outline:hover {
      background: rgba(212, 168, 83, 0.12);
      color: #FFFFFF;
      border-color: #FFFFFF;
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 40px);
      max-width: 460px;
      background: #FFFFFF;
      backdrop-filter: blur(16px);
      background: rgba(255,255,255,0.92);
      box-shadow: 0 14px 30px rgba(0,0,0,0.12);
      border-radius: 50px;
      padding: 8px 20px;
      z-index: 1100;
      display: none;
      justify-content: space-around;
      align-items: center;
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      color: #6B6B6B;
      font-weight: 500;
      gap: 4px;
    }
    .mobile-nav-item.active {
      color: var(--accent-gold);
    }
    .mobile-cta {
      background: var(--accent-gold);
      color: white;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 8px 20px rgba(212,168,83,0.5);
      margin-top: -18px;
      font-size: 1.4rem;
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: radial-gradient(circle at 20% 30%, rgba(212,168,83,0.08) 0%, transparent 70%);
      position: relative;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
    }
    .hero-image-wrapper {
      border-radius: 28px;
      overflow: hidden;
      border: 1px solid rgba(212,168,83,0.3);
      box-shadow: 0 20px 40px rgba(11,30,63,0.15);
      background: rgba(255,255,255,0.4);
      backdrop-filter: blur(8px);
    }
    .hero-image-wrapper img {
      width: 100%;
      height: auto;
      aspect-ratio: 4/3;
      object-fit: cover;
    }
    h1 {
      font-size: 3.4rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--primary-deep);
      margin-bottom: 1.2rem;
    }
    .hero-sub {
      font-size: 1.15rem;
      color: #4B5563;
      margin-bottom: 2rem;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 2.5rem;
    }
    .trust-badge {
      display: flex;
      align-items: center;
      gap: 24px;
      color: #6B6B6B;
      font-size: 0.9rem;
    }

    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 650;
      color: var(--primary-deep);
      margin-bottom: 1rem;
      letter-spacing: -0.2px;
    }
    .section-sub {
      color: #5F6B7A;
      margin-bottom: 3rem;
    }

    /* 亮点网格非对称 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .highlight-card {
      background: var(--card-glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }
    .highlight-card:hover {
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(212,168,83,0.5);
    }
    .highlight-icon {
      font-size: 2rem;
      color: var(--accent-gold);
      margin-bottom: 1.5rem;
    }
    .highlight-stat {
      font-weight: 700;
      font-size: 2rem;
      color: var(--accent-gold);
      margin-top: 1rem;
    }

    /* 案例瀑布 */
    .cases-masonry {
      column-count: 3;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      background: #FFFFFF;
      border-radius: 20px;
      margin-bottom: 24px;
      box-shadow: 0 6px 20px rgba(0,0,0,0.04);
      overflow: hidden;
      transition: 0.2s;
    }
    .case-card img {
      width: 100%;
      aspect-ratio: 4/3;
    }
    .case-content {
      padding: 20px;
    }
    .tag {
      background: rgba(212,168,83,0.15);
      color: #8B6914;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
    }

    /* 方案对比 */
    .compare-row {
      display: flex;
      gap: 24px;
    }
    .compare-card {
      flex: 1;
      background: rgba(255,255,255,0.75);
      backdrop-filter: blur(12px);
      border-radius: 24px;
      padding: 36px;
    }
    .recommend-badge {
      background: var(--accent-gold);
      color: white;
      padding: 4px 16px;
      border-radius: 30px;
      font-size: 0.8rem;
    }

    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.65);
      backdrop-filter: blur(8px);
      border-radius: 16px;
      margin-bottom: 16px;
      padding: 16px 24px;
      cursor: pointer;
    }

    /* CTA */
    .cta-dark {
      background: #0B1E3F;
      color: white;
      text-align: center;
      padding: 90px 20px;
    }

    .footer {
      background: #07162B;
      color: #9BA3B0;
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .nav-menu { display: none; }
      .mobile-nav { display: flex; }
      .hero-grid { flex-direction: column; }
      h1 { font-size: 2.5rem; }
    }
    @media (max-width: 768px) {
      .highlights-grid { grid-template-columns: 1fr; }
      .cases-masonry { column-count: 1; }
      .compare-row { flex-direction: column; }
    }