/* roulang page: index */
:root {
      --bs-primary: #1B1A3B;
      --bs-secondary: #C8A96E;
      --bs-body-bg: #F7F5F0;
      --bs-body-color: #2D2D2D;
      --bs-border-radius: 12px;
      --bs-btn-border-radius: 8px;
      --deep-space: #1B1A3B;
      --champagne: #C8A96E;
      --warm-white: #F7F5F0;
      --charcoal: #2D2D2D;
      --deep-blue-gray: #3A3A5C;
      --star-blue: #4A6FA5;
      --success-green: #2D6A4F;
      --light-silver: #D5D5E0;
      --footer-bg: #15132E;
      --footer-text: #B0B0C0;
      --card-shadow: 0 2px 12px rgba(27,26,59,0.06);
      --card-hover-shadow: 0 8px 28px rgba(27,26,59,0.12);
      --transition-smooth: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      background-color: var(--warm-white);
      color: var(--charcoal);
      line-height: 1.6;
      margin: 0;
      padding: 0;
      font-weight: 400;
    }

    h1, h2, h3, h4, h5, h6 {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      color: var(--deep-space);
      font-weight: 600;
      letter-spacing: 0.5px;
    }

    h1 { font-size: 42px; line-height: 52px; font-weight: 700; }
    h2 { font-size: 32px; line-height: 40px; }
    h3 { font-size: 22px; line-height: 30px; font-weight: 500; }
    .text-large { font-size: 16px; line-height: 26px; }
    .text-small { font-size: 14px; line-height: 20px; }
    .text-micro { font-size: 12px; line-height: 18px; }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    @media (max-width: 576px) {
      .container-custom { padding: 0 16px; }
      h1 { font-size: 32px; line-height: 40px; }
      h2 { font-size: 28px; line-height: 36px; }
    }

    /* 导航 */
    .navbar {
      background-color: var(--deep-space);
      height: 72px;
      transition: var(--transition-smooth);
      box-shadow: 0 2px 16px rgba(0,0,0,0.15);
      padding: 0 24px;
      z-index: 1020;
    }
    .navbar.scrolled {
      height: 60px;
    }
    .navbar-brand {
      font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      font-weight: 700;
      font-size: 22px;
      color: white !important;
      letter-spacing: 1px;
      transition: font-size 0.2s;
    }
    .navbar.scrolled .navbar-brand {
      font-size: 20px;
    }
    .navbar .nav-link {
      color: rgba(255,255,255,0.85) !important;
      font-weight: 500;
      margin: 0 4px;
      transition: color 0.25s;
      font-size: 15px;
    }
    .navbar .nav-link:hover,
    .navbar .nav-link.active {
      color: var(--champagne) !important;
    }
    .btn-primary-custom {
      background-color: var(--champagne);
      color: var(--deep-space);
      font-weight: 600;
      border: none;
      padding: 10px 24px;
      border-radius: 8px;
      transition: var(--transition-smooth);
      font-size: 14px;
    }
    .btn-primary-custom:hover {
      background-color: var(--deep-space);
      color: var(--champagne);
    }
    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--deep-space);
      color: var(--deep-space);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: 8px;
      transition: var(--transition-smooth);
    }
    .btn-outline-custom:hover {
      background-color: rgba(200,169,110,0.08);
      border-color: var(--champagne);
      color: var(--deep-space);
    }
    .navbar-toggler {
      border-color: rgba(255,255,255,0.5);
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    @media (max-width: 991px) {
      .navbar-collapse {
        background-color: var(--deep-space);
        padding: 20px;
        border-radius: 0 0 12px 12px;
      }
      .navbar .btn-primary-custom {
        width: 100%;
        margin-top: 8px;
      }
    }

    /* Hero */
    #hero {
      background: linear-gradient(90deg, rgba(27,26,59,0.03) 0%, rgba(200,169,110,0.05) 100%);
      padding: 100px 0 80px;
    }
    .hero-title {
      color: var(--deep-space);
      font-weight: 700;
    }
    .hero-sub {
      color: var(--charcoal);
      max-width: 480px;
    }
    .hero-img-col {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 380px;
      border-radius: 24px;
      position: relative;
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }
    .hero-img-col::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(135deg, rgba(27,26,59,0.3) 0%, rgba(27,26,59,0) 60%);
    }
    @media (max-width: 768px) {
      .hero-img-col {
        min-height: 240px;
        margin-top: 24px;
      }
    }

    /* 价值主张 */
    .value-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .value-row.reverse {
      flex-direction: row-reverse;
    }
    .value-img {
      width: 280px;
      height: 200px;
      background-size: cover;
      background-position: center;
      border-radius: 16px;
      box-shadow: var(--card-shadow);
    }
    .value-accent {
      width: 4px;
      height: 60px;
      background-color: var(--champagne);
      margin-right: 20px;
      border-radius: 2px;
    }
    @media (max-width: 768px) {
      .value-row, .value-row.reverse {
        flex-direction: column;
        gap: 24px;
      }
      .value-img {
        width: 100%;
        height: 180px;
      }
    }

    /* 功能标签切换 */
    .nav-tabs .nav-link {
      color: var(--deep-space);
      font-weight: 500;
      border: none;
      padding: 12px 24px;
      border-radius: 30px;
      margin: 0 4px;
    }
    .nav-tabs .nav-link.active {
      background-color: var(--champagne);
      color: var(--deep-space);
      font-weight: 600;
    }
    .feature-preview {
      background-size: cover;
      background-position: center;
      height: 260px;
      border-radius: 16px;
      background-color: #ddd;
    }

    /* 使用场景卡片 */
    .scene-card {
      background: white;
      border-radius: 12px;
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
      overflow: hidden;
    }
    .scene-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }
    .scene-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }

    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 10px;
      scrollbar-width: thin;
      scrollbar-color: var(--champagne) #eee;
    }
    .cases-scroll::-webkit-scrollbar {
      height: 6px;
    }
    .cases-scroll::-webkit-scrollbar-thumb {
      background: var(--champagne);
      border-radius: 3px;
    }
    .case-card {
      min-width: 300px;
      background: white;
      border-radius: 16px;
      box-shadow: var(--card-shadow);
      overflow: hidden;
    }
    .case-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .stat-green {
      color: var(--success-green);
      font-weight: 700;
      font-size: 28px;
    }

    /* 价格方案 */
    .pricing-card {
      background: white;
      border-radius: 16px;
      padding: 32px;
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
      border: 1px solid transparent;
    }
    .pricing-card.recommended {
      border: 2px solid var(--champagne);
      transform: scale(1.03);
      box-shadow: var(--card-hover-shadow);
    }
    .badge-champagne {
      background: var(--champagne);
      color: var(--deep-space);
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
    }

    /* FAQ */
    .accordion-button {
      background-color: var(--warm-white);
      color: var(--charcoal);
      font-weight: 500;
      box-shadow: none;
      border-left: 4px solid transparent;
    }
    .accordion-button:not(.collapsed) {
      background-color: white;
      color: var(--deep-space);
      border-left: 4px solid var(--champagne);
    }

    /* CTA 尾 */
    #cta-bottom {
      background-color: var(--deep-space);
      background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.05) 0%, transparent 30%);
    }

    /* 页脚 */
    footer {
      background-color: var(--footer-bg);
      color: var(--footer-text);
    }
    .footer-link {
      color: var(--footer-text);
      text-decoration: none;
      transition: color 0.2s;
    }
    .footer-link:hover {
      color: var(--champagne);
    }
    .social-circle {
      width: 36px;
      height: 36px;
      border: 1px solid var(--footer-text);
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: var(--footer-text);
      transition: var(--transition-smooth);
    }
    .social-circle:hover {
      background: var(--champagne);
      border-color: var(--champagne);
      color: var(--deep-space);
    }