/* roulang page: index */
:root {
      --gold-start: #D4A853;
      --gold-end: #B8860B;
      --deep-charcoal: #1E1E1E;
      --warm-white: #FAF7F2;
      --burgundy: #8B1E2B;
      --text-primary: #2D2D2D;
      --text-secondary: #5A5A5A;
      --border-warm: #E8E0D5;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.02);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --shadow-lg: 0 20px 40px rgba(0,0,0,0.1);
      --radius-card-lg: 24px;
      --radius-card: 16px;
      --radius-sm: 12px;
      --radius-btn: 30px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", system-ui, -apple-system, sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--white);
      color: var(--text-primary);
      line-height: 1.75;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 600;
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
    }

    h2 {
      font-size: 2.25rem;
      font-weight: 600;
      margin-bottom: 0.8rem;
    }

    h3 {
      font-size: 1.5rem;
      font-weight: 600;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

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

    button, input, textarea {
      font-family: inherit;
      border: none;
      outline: none;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
      z-index: 100;
      transition: background 0.3s ease, box-shadow 0.3s ease;
      border-bottom: 1px solid rgba(232,224,213,0.5);
    }

    .header.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--deep-charcoal);
      letter-spacing: 0.5px;
    }

    .logo img {
      height: 40px;
      width: auto;
      border-radius: 8px;
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--gold-start);
      transition: width 0.3s ease;
    }

    .nav-links a:hover {
      color: var(--gold-end);
    }

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

    .btn-primary {
      background: linear-gradient(135deg, var(--gold-start), var(--gold-end));
      color: var(--white);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 12px rgba(212,168,83,0.3);
      border: none;
      letter-spacing: 0.3px;
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #c49a3c, #a07a0b);
      box-shadow: 0 0 20px rgba(212,168,83,0.5);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--gold-start);
      color: var(--gold-end);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
    }

    .btn-outline:hover {
      background: rgba(212,168,83,0.08);
      border-color: var(--gold-end);
      color: #9e7a0e;
    }

    .hamburger {
      display: none;
      background: none;
      font-size: 1.8rem;
      color: var(--deep-charcoal);
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .nav-links {
        gap: 1.8rem;
      }
    }

    @media (max-width: 768px) {
      .hamburger {
        display: block;
      }
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        gap: 1.5rem;
        padding: 2rem;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        display: none;
        border-bottom: 1px solid var(--border-warm);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-cta {
        display: none;
      }
      .mobile-cta {
        display: block;
        margin-top: 1rem;
      }
    }

    .mobile-cta {
      display: none;
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background-color: var(--warm-white);
      display: flex;
      align-items: center;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 55% 45%;
      gap: 3rem;
      align-items: center;
    }

    .hero-left h1 {
      margin-bottom: 1.5rem;
    }

    .gold-text {
      background: linear-gradient(135deg, var(--gold-start), var(--gold-end));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-sub {
      font-size: 1.125rem;
      color: var(--text-secondary);
      max-width: 480px;
      margin-bottom: 2rem;
      line-height: 1.7;
    }

    .badge-group {
      display: flex;
      gap: 2rem;
      margin-bottom: 2.5rem;
      align-items: center;
    }

    .badge-item {
      display: flex;
      flex-direction: column;
    }

    .badge-number {
      font-family: var(--font-number);
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--burgundy);
      line-height: 1.2;
    }

    .badge-label {
      font-size: 0.9rem;
      color: var(--text-secondary);
    }

    .divider {
      width: 1px;
      height: 40px;
      background: var(--border-warm);
    }

    .hero-right {
      position: relative;
    }

    .hero-main-img {
      border-radius: var(--radius-card-lg);
      box-shadow: var(--shadow-lg);
      width: 100%;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    .floating-card {
      position: absolute;
      bottom: -20px;
      left: -20px;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      padding: 16px 24px;
      border-radius: 20px;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .floating-card i {
      color: var(--gold-start);
      font-size: 1.8rem;
    }

    .floating-text {
      font-weight: 600;
      color: var(--deep-charcoal);
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-right {
        order: -1;
      }
      h1 {
        font-size: 2.2rem;
      }
      .badge-group {
        flex-wrap: wrap;
      }
      .floating-card {
        left: 10px;
        bottom: -15px;
      }
    }

    /* 亮点网格 */
    .features {
      padding: 80px 0;
      background: var(--white);
    }

    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }

    .grid-irregular {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-bottom: 24px;
    }

    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 32px 24px;
      transition: all 0.3s ease;
      border: 1px solid var(--border-warm);
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .icon-circle {
      width: 56px;
      height: 56px;
      background: rgba(212,168,83,0.1);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--gold-end);
      font-size: 1.8rem;
    }

    .card h3 {
      margin-bottom: 12px;
    }

    .badge-pill {
      background: rgba(139,30,43,0.08);
      color: var(--burgundy);
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 12px;
    }

    .row-wide {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }

    .wide-card {
      background: var(--warm-white);
      border-radius: var(--radius-card);
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .stack-cards {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    @media (max-width: 768px) {
      .grid-irregular, .row-wide {
        grid-template-columns: 1fr;
      }
    }

    /* 案例瀑布流 */
    .cases {
      padding: 80px 0;
      background: var(--warm-white);
    }

    .masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
    }

    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }

    .case-img {
      height: 200px;
      object-fit: cover;
      width: 100%;
    }

    .case-content {
      padding: 20px;
    }

    .tag {
      background: rgba(212,168,83,0.12);
      color: #B8860B;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 20px;
      display: inline-block;
    }

    .data-highlight {
      color: var(--burgundy);
      font-weight: 800;
      font-family: var(--font-number);
      font-size: 1.4rem;
      margin-top: 12px;
    }

    @media (max-width: 1024px) {
      .masonry {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 520px) {
      .masonry {
        grid-template-columns: 1fr;
      }
    }

    /* 对比表 */
    .comparison {
      padding: 80px 0;
      background: var(--white);
    }

    .table-responsive {
      overflow-x: auto;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      min-width: 600px;
    }

    th {
      text-align: left;
      padding: 20px;
      background: var(--warm-white);
      font-weight: 600;
    }

    td {
      padding: 20px;
      border-bottom: 1px solid var(--border-warm);
    }

    .highlight-col {
      background: rgba(212,168,83,0.05);
      font-weight: 600;
    }

    @media (max-width: 768px) {
      .table-card {
        background: var(--white);
        border-radius: 16px;
        padding: 20px;
        margin-bottom: 16px;
        box-shadow: var(--shadow-sm);
      }
      .desktop-table {
        display: none;
      }
    }

    .mobile-compare {
      display: none;
    }

    @media (max-width: 768px) {
      .mobile-compare {
        display: block;
      }
      .desktop-table {
        display: none;
      }
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(105deg, #1E1E1E 0%, #2a2a2a 100%);
      padding: 70px 0;
      color: white;
      text-align: center;
    }

    .cta-form {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: center;
      margin-top: 32px;
    }

    .cta-form input {
      padding: 16px 20px;
      border-radius: 8px;
      border: 1px solid var(--border-warm);
      background: white;
      min-width: 200px;
    }

    /* FAQ */
    .faq {
      padding: 80px 0;
    }

    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .faq-item {
      background: var(--warm-white);
      border-radius: 16px;
      padding: 18px 24px;
      cursor: pointer;
    }

    .faq-q {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
    }

    .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }

    .faq-item.open .faq-a {
      max-height: 200px;
      margin-top: 12px;
    }

    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    footer {
      background: #1E1E1E;
      color: #B0B0B0;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }