/* roulang page: index */
:root {
      --primary-deep: #0A0E1A;
      --accent-gold: #C9A84C;
      --accent-gold-hover: #B8942E;
      --bg-warm: #F5F3EE;
      --text-dark: #1A1A1A;
      --text-muted: #5C5C5C;
      --text-light: #B0B0B0;
      --deep-blue: #1E3A5F;
      --white: #FFFFFF;
      --border-light: #E5E0D8;
      --shadow-card: 0 4px 20px rgba(10, 14, 26, 0.06);
      --shadow-card-hover: 0 8px 30px rgba(10, 14, 26, 0.12);
      --radius-md: 12px;
      --radius-btn: 8px;
      --font-sans: 'Inter', '思源黑体', 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      --transition-smooth: all 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
      font-size: 16px;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }

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

    h1, h2, h3, h4 {
      font-weight: 700;
    }

    .container {
      max-width: 1140px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 15px;
      padding-right: 15px;
    }

    /* 导航 */
    .navbar-custom {
      background-color: var(--primary-deep);
      padding: 12px 0;
      position: sticky;
      top: 0;
      z-index: 1020;
      box-shadow: 0 2px 10px rgba(0,0,0,0.2);
      transition: var(--transition-smooth);
    }
    .logo-text {
      font-size: 1.5rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      color: white;
      white-space: nowrap;
    }
    .logo-text span {
      color: var(--accent-gold);
    }
    .nav-link-custom {
      color: rgba(255,255,255,0.75);
      font-weight: 500;
      margin: 0 8px;
      padding: 6px 12px;
      border-radius: 6px;
      transition: var(--transition-smooth);
    }
    .nav-link-custom:hover,
    .nav-link-custom.active {
      color: var(--accent-gold);
      background-color: rgba(255,255,255,0.05);
    }
    .btn-cta-nav {
      background-color: var(--accent-gold);
      color: var(--primary-deep);
      font-weight: 700;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      border: none;
      transition: var(--transition-smooth);
      letter-spacing: 0.3px;
      white-space: nowrap;
      box-shadow: 0 2px 8px rgba(201,168,76,0.3);
    }
    .btn-cta-nav:hover {
      background-color: var(--accent-gold-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(201,168,76,0.5);
      color: var(--primary-deep);
    }
    .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(255,255,255,0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    @media (max-width: 991px) {
      .navbar-nav {
        background-color: rgba(10,14,26,0.95);
        padding: 20px;
        border-radius: 12px;
        margin-top: 10px;
      }
      .nav-link-custom {
        margin: 6px 0;
        text-align: center;
      }
      .btn-cta-nav {
        width: 100%;
        margin-top: 8px;
      }
    }

    /* Hero */
    .hero-section {
      background: linear-gradient(0deg, rgba(10,14,26,0.7), rgba(10,14,26,0.7)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
    }
    .hero-title {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      text-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }
    .hero-sub {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.85);
      margin: 24px 0 32px;
      max-width: 600px;
    }
    .btn-hero-primary {
      background-color: var(--accent-gold);
      color: var(--primary-deep);
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 1.1rem;
      letter-spacing: 0.5px;
      box-shadow: 0 6px 18px rgba(201,168,76,0.4);
      transition: var(--transition-smooth);
    }
    .btn-hero-primary:hover {
      background-color: var(--accent-gold-hover);
      transform: translateY(-3px);
      box-shadow: 0 10px 24px rgba(201,168,76,0.6);
      color: var(--primary-deep);
    }
    .btn-hero-outline {
      border: 2px solid white;
      background: transparent;
      color: white;
      font-weight: 600;
      padding: 12px 36px;
      border-radius: var(--radius-btn);
      margin-left: 16px;
      transition: var(--transition-smooth);
    }
    .btn-hero-outline:hover {
      background-color: white;
      color: var(--primary-deep);
      border-color: white;
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.3rem;
      }
      .hero-sub {
        font-size: 1rem;
      }
      .btn-hero-outline {
        margin-left: 0;
        margin-top: 12px;
        display: block;
        width: fit-content;
      }
      .btn-hero-primary {
        display: block;
        width: 100%;
      }
    }

    /* 板块通用 */
    .section-padding {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--primary-deep);
    }
    .section-desc {
      color: var(--text-muted);
      font-size: 1.15rem;
      max-width: 700px;
      margin-bottom: 48px;
    }

    /* 卡片 */
    .card-custom {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      box-shadow: var(--shadow-card);
      border: 1px solid transparent;
      transition: var(--transition-smooth);
      height: 100%;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-card-hover);
      border-color: var(--accent-gold);
      transform: translateY(-6px);
    }
    .icon-gold {
      font-size: 2.8rem;
      color: var(--accent-gold);
      margin-bottom: 20px;
    }

    /* 优势数字 */
    .stat-number {
      font-family: 'DIN Alternate', 'Inter', system-ui;
      font-weight: 700;
      font-size: 2.8rem;
      color: var(--primary-deep);
      line-height: 1.2;
    }

    /* 案例卡片 */
    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    .case-card:hover {
      box-shadow: var(--shadow-card-hover);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    /* 证言 */
    .testimonial-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-card);
    }
    .testimonial-avatar {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      background-size: cover;
      background-position: center;
      border: 2px solid var(--accent-gold);
    }

    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--primary-deep);
      font-weight: 700;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--accent-gold);
    }
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }

    /* CTA 全宽 */
    .cta-full {
      background: linear-gradient(0deg, rgba(10,14,26,0.8), rgba(10,14,26,0.8)), url('/assets/images/backpic/back-2.webp') center/cover;
      padding: 90px 0;
      color: white;
    }

    /* 页脚 */
    .footer-custom {
      background-color: var(--primary-deep);
      color: var(--text-light);
      padding: 60px 0 30px;
    }
    .footer-link {
      color: #aaa;
      transition: var(--transition-smooth);
    }
    .footer-link:hover {
      color: var(--accent-gold);
    }