/* roulang page: index */
:root {
      --primary-deep: #1A2B3C;
      --accent-gold: #C49A2B;
      --accent-gold-hover: #A67F22;
      --bg-warm: #FAF9F6;
      --card-white: #FFFFFF;
      --text-main: #1e2b38;
      --text-soft: #5a6b7a;
      --border-light: rgba(26, 43, 60, 0.08);
      --shadow-card: 0 4px 20px rgba(26, 43, 60, 0.06);
      --shadow-hover: 0 12px 32px rgba(26, 43, 60, 0.12);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --transition: all 0.25s ease;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      --font-number: 'Inter', system-ui, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    h1, h2, h3, .serif-font {
      font-family: var(--font-serif);
      font-weight: 600;
      letter-spacing: -0.2px;
    }

    h1 {
      font-size: 40px;
      line-height: 1.3;
      font-weight: 700;
    }

    h2 {
      font-size: 32px;
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
    }

    .text-number {
      font-family: var(--font-number);
      font-weight: 700;
    }

    .container {
      max-width: 1200px;
    }

    section {
      padding: 100px 0;
    }

    /* 导航 */
    .navbar {
      background-color: var(--bg-warm);
      height: 72px;
      box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
      padding: 0 1.5rem;
    }

    .navbar-brand {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary-deep) !important;
      letter-spacing: 0.5px;
    }
    .navbar-brand span {
      color: var(--accent-gold);
    }

    .nav-chips {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      flex-wrap: wrap;
    }

    .nav-chip {
      background: transparent;
      border: none;
      padding: 0.4rem 1.1rem;
      border-radius: 50px;
      color: var(--primary-deep);
      font-weight: 500;
      font-size: 0.95rem;
      transition: var(--transition);
      text-decoration: none;
      white-space: nowrap;
    }

    .nav-chip:hover {
      background: var(--primary-deep);
      color: white;
    }

    .nav-chip.active {
      background: var(--accent-gold);
      color: var(--primary-deep);
      font-weight: 600;
    }

    .btn-primary-cta {
      background: var(--accent-gold);
      border: none;
      color: var(--primary-deep);
      font-weight: 700;
      padding: 0.6rem 1.8rem;
      border-radius: 8px;
      transition: var(--transition);
      font-size: 0.95rem;
      letter-spacing: 0.3px;
    }

    .btn-primary-cta:hover {
      background: var(--accent-gold-hover);
      color: white;
    }

    .btn-outline-dark {
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      font-weight: 600;
      padding: 0.6rem 1.8rem;
      border-radius: 8px;
      transition: var(--transition);
    }

    .btn-outline-dark:hover {
      background: var(--primary-deep);
      color: white;
    }

    /* 汉堡菜单 (移动端) 保留干净样式 */
    .navbar-toggler {
      border: none;
      color: var(--primary-deep);
    }

    @media (max-width: 992px) {
      .navbar-collapse {
        background: var(--bg-warm);
        padding: 1.5rem;
        border-radius: 0 0 16px 16px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.06);
        margin-top: 0.5rem;
      }
      .nav-chips {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.4rem;
      }
    }

    /* Hero */
    .hero-section {
      min-height: 80vh;
      display: flex;
      align-items: center;
      background: linear-gradient(90deg, #FAF9F6 0%, #f3efe7 100%);
      padding-top: 72px;
    }

    .hero-title {
      font-size: 42px;
    }

    .hero-image-wrapper {
      position: relative;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(26,43,60,0.18);
    }
    .hero-image-wrapper img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }
    .gold-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(196, 154, 43, 0.1);
      pointer-events: none;
    }

    /* 卡片通用 */
    .card-u8 {
      background: var(--card-white);
      border: none;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      height: 100%;
    }
    .card-u8:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .card-body-u8 {
      padding: 2rem;
    }

    .pain-card {
      border-left: 4px solid transparent;
    }
    .pain-card:hover {
      border-left-color: var(--accent-gold);
    }

    .testimonial-card {
      border-left: 5px solid var(--accent-gold);
      background: var(--card-white);
    }

    .icon-circle {
      width: 52px;
      height: 52px;
      background: rgba(196, 154, 43, 0.12);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-gold);
      font-size: 24px;
      margin-bottom: 1.2rem;
    }

    /* 解决方案图文 */
    .solution-row {
      margin-bottom: 80px;
    }
    .solution-img {
      border-radius: var(--radius-lg);
      width: 100%;
      height: auto;
      box-shadow: 0 12px 28px rgba(0,0,0,0.08);
    }

    /* 成果数字 */
    .metric-card {
      text-align: center;
      padding: 2rem 1rem;
    }
    .metric-number {
      font-size: 44px;
      color: var(--accent-gold);
    }

    /* FAQ */
    .accordion-button {
      background: white;
      font-weight: 600;
      font-size: 1.1rem;
      box-shadow: none;
      border-radius: 12px !important;
    }
    .accordion-item {
      border: 1px solid var(--border-light);
      margin-bottom: 0.8rem;
      border-radius: 12px;
      overflow: hidden;
    }
    .accordion-button:not(.collapsed) {
      background: white;
      color: var(--primary-deep);
      border-left: 4px solid var(--accent-gold);
    }

    /* CTA 区块 */
    .cta-full {
      background: var(--primary-deep);
      border-radius: 28px;
      padding: 4rem 2rem;
      color: white;
    }

    footer {
      background: var(--primary-deep);
      color: #dddddd;
      padding: 3rem 0 1.5rem;
    }
    footer h5 {
      color: var(--accent-gold);
      font-weight: 600;
    }
    footer a {
      color: #cccccc;
      text-decoration: none;
      transition: 0.2s;
    }
    footer a:hover {
      color: var(--accent-gold);
    }

    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      .hero-title { font-size: 32px; }
      section { padding: 60px 0; }
    }