/* roulang page: index */
:root {
      --deep-blue: #1A1A2E;
      --champagne: #C9A96E;
      --metallic-gold: #D4AF37;
      --warm-bg: #FAFAF8;
      --card-bg: #F5F4F0;
      --light-champagne-bg: #FDFBF5;
      --text-primary: #1A1A2E;
      --text-secondary: #4A4A5A;
      --text-muted: #B0B0C0;
      --border-light: rgba(201, 169, 110, 0.2);
      --shadow-hover: 0 12px 28px rgba(26, 26, 46, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-chip: 20px;
      --gutter-desktop: 32px;
      --gutter-mobile: 20px;
      --section-gap-desktop: 120px;
      --section-gap-tablet: 80px;
      --section-gap-mobile: 60px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--warm-bg);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      margin: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, .serif-title {
      font-family: 'Noto Serif SC', serif;
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    .number-font {
      font-family: 'Inter', sans-serif;
      font-weight: 600;
      letter-spacing: 0.05em;
    }

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

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

    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
      margin: 0 auto;
    }

    /* 导航栏 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(250, 250, 248, 0.92);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-light);
      z-index: 999;
      padding: 10px 0;
      transition: all 0.3s;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .logo {
      font-family: 'Noto Serif SC', serif;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--champagne);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo i {
      font-size: 1.4rem;
      color: var(--metallic-gold);
    }

    .nav-chips {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .nav-chip {
      background: transparent;
      border: none;
      padding: 8px 18px;
      border-radius: var(--radius-chip);
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-primary);
      transition: all 0.25s cubic-bezier(0.2, 0.9, 0.4, 1);
      white-space: nowrap;
    }

    .nav-chip:hover, .nav-chip.active {
      background: var(--champagne);
      color: white;
    }

    .btn-cta-nav {
      background: var(--metallic-gold);
      color: var(--deep-blue);
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      transition: all 0.3s;
      white-space: nowrap;
    }

    .btn-cta-nav:hover {
      background: #e0b941;
      box-shadow: 0 0 12px rgba(212, 175, 55, 0.4);
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(250, 250, 248, 0.96);
        backdrop-filter: blur(8px);
        border-top: 1px solid var(--border-light);
        justify-content: space-around;
        padding: 8px 0;
        z-index: 999;
      }
      .mobile-nav-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 0.7rem;
        color: var(--text-secondary);
        transition: 0.2s;
      }
      .mobile-nav-item i {
        font-size: 1.2rem;
        margin-bottom: 2px;
      }
      .mobile-nav-item.active {
        color: var(--champagne);
        font-weight: 600;
      }
      .logo {
        font-size: 1.3rem;
        justify-content: center;
        width: 100%;
      }
      .nav-container {
        flex-direction: column;
        gap: 8px;
      }
      .btn-cta-nav {
        position: fixed;
        bottom: 80px;
        right: 20px;
        z-index: 1000;
        box-shadow: 0 6px 18px rgba(0,0,0,0.15);
      }
    }

    /* 板块间距 */
    section {
      padding: var(--section-gap-desktop) 0;
    }

    @media (max-width: 992px) {
      section {
        padding: var(--section-gap-tablet) 0;
      }
    }

    @media (max-width: 768px) {
      section {
        padding: var(--section-gap-mobile) 0;
      }
    }

    /* Hero */
    .hero {
      padding-top: 140px;
      padding-bottom: 80px;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 50px;
    }
    .hero-left {
      flex: 0 0 60%;
    }
    .hero-right {
      flex: 0 0 40%;
      position: relative;
    }
    .hero-right img {
      border-radius: 16px;
      box-shadow: 0 20px 35px rgba(26,26,46,0.08);
      width: 100%;
      height: auto;
    }
    .floating-card {
      position: absolute;
      bottom: -20px;
      right: -20px;
      background: rgba(26, 26, 46, 0.8);
      backdrop-filter: blur(8px);
      color: white;
      padding: 16px 24px;
      border-radius: 12px;
      text-align: center;
    }
    .floating-card .big-number {
      font-size: 2.5rem;
      color: var(--metallic-gold);
    }
    .hero-buttons .btn {
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      margin-right: 16px;
    }
    .btn-outline-gold {
      border: 1px solid var(--champagne);
      color: var(--champagne);
      background: transparent;
    }
    .btn-solid-gold {
      background: var(--metallic-gold);
      color: var(--deep-blue);
      border: none;
    }

    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column-reverse;
      }
      .hero-left, .hero-right {
        flex: 0 0 100%;
      }
      .floating-card {
        right: 10px;
        bottom: -15px;
      }
    }

    /* 亮点网格 */
    .highlight-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1px;
      background: rgba(0,0,0,0.03);
    }
    .highlight-item {
      background: var(--warm-bg);
      padding: 40px 30px;
      transition: 0.3s;
    }
    .highlight-item.large {
      grid-row: span 2;
      background: var(--light-champagne-bg);
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .highlight-number {
      font-size: 3rem;
      color: var(--champagne);
    }
    .large .highlight-number {
      color: var(--deep-blue);
    }

    @media (max-width: 768px) {
      .highlight-grid {
        grid-template-columns: 1fr;
      }
      .highlight-item.large {
        grid-row: span 1;
      }
    }

    /* 案例瀑布流 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1);
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-body {
      padding: 20px;
    }
    .chip-tag {
      background: rgba(201, 169, 110, 0.15);
      color: var(--champagne);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 500;
    }

    @media (max-width: 992px) {
      .case-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 576px) {
      .case-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比表 */
    .compare-table {
      display: flex;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    }
    .compare-col {
      flex: 1;
      padding: 40px;
    }
    .compare-left {
      background: white;
    }
    .compare-right {
      background: var(--light-champagne-bg);
      position: relative;
    }
    .badge-recommend {
      position: absolute;
      top: 20px;
      right: 20px;
      background: var(--metallic-gold);
      color: var(--deep-blue);
      padding: 6px 18px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 0.8rem;
    }
    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid #eee;
    }

    @media (max-width: 768px) {
      .compare-table {
        flex-direction: column;
      }
    }

    /* FAQ */
    .accordion-faq .accordion-item {
      background: transparent;
      border: none;
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-button {
      font-weight: 500;
      font-size: 1.1rem;
      color: var(--deep-blue);
      background: transparent;
      box-shadow: none;
    }
    .accordion-button:not(.collapsed) {
      background: transparent;
      color: var(--champagne);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--deep-blue);
      padding: 80px 0;
      color: white;
    }
    .input-cta {
      border-radius: var(--radius-input);
      border: none;
      padding: 14px 20px;
    }
    .btn-cta-banner {
      background: var(--metallic-gold);
      color: var(--deep-blue);
      font-weight: 600;
      padding: 14px 30px;
      border-radius: var(--radius-btn);
    }

    /* 页脚 */
    footer {
      background: var(--deep-blue);
      color: var(--text-muted);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }