/* roulang page: index */
:root {
      --bs-primary: #1A3C40;
      --bs-body-bg: #FAF7F2;
      --bs-body-color: #2C2C2C;
      --bs-border-radius: 16px;
      --bs-btn-border-radius: 40px;
      --primary-deep: #1A3C40;
      --accent-gold: #C89B3C;
      --bg-warm: #FAF7F2;
      --cta-terracotta: #D46A4A;
      --text-main: #2C2C2C;
      --text-muted: #4A4A4A;
      --card-bg: #FFFFFF;
      --shadow-sm: 0 8px 30px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.08);
      --font-heading: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'PingFang SC', 'Noto Sans SC', sans-serif;
      --border-gold: 2px solid #C89B3C;
      --transition-base: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, h5, h6 {
      font-family: var(--font-heading);
      font-weight: 600;
      letter-spacing: 0.5px;
    }

    a {
      text-decoration: none;
      color: var(--primary-deep);
      transition: var(--transition-base);
    }
    a:hover {
      color: var(--accent-gold);
    }

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

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

    /* 导航 */
    #header {
      background-color: #FFFFFF;
      padding: 16px 0;
      position: sticky;
      top: 0;
      z-index: 1000;
      box-shadow: 0 4px 20px rgba(0,0,0,0.02);
      transition: box-shadow 0.2s;
    }
    .header-scrolled {
      box-shadow: 0 8px 24px rgba(0,0,0,0.06);
    }
    .navbar-brand {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary-deep) !important;
      letter-spacing: 0.8px;
    }
    .navbar-nav .nav-link {
      color: var(--text-muted) !important;
      font-weight: 500;
      margin: 0 6px;
      padding: 6px 10px !important;
      border-bottom: 2px solid transparent;
      transition: var(--transition-base);
      font-size: 0.95rem;
    }
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--primary-deep) !important;
      border-bottom: 2px solid var(--accent-gold);
    }
    .nav-cta-btn {
      background: transparent;
      border: 2px solid var(--accent-gold);
      color: var(--accent-gold);
      border-radius: 40px;
      padding: 8px 20px;
      font-weight: 600;
      transition: var(--transition-base);
      margin-left: 16px;
    }
    .nav-cta-btn:hover {
      background: rgba(200, 155, 60, 0.1);
      color: var(--accent-gold);
    }
    .navbar-toggler {
      border: none;
      color: var(--primary-deep);
      font-size: 1.5rem;
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    @media (max-width: 768px) {
      .navbar-collapse {
        background: #FFFFFF;
        padding: 24px;
        border-radius: 20px;
        margin-top: 12px;
        box-shadow: var(--shadow-sm);
      }
      .nav-cta-btn {
        margin-left: 0;
        margin-top: 8px;
        display: inline-block;
      }
    }

    /* 区块间距 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    .section-title {
      font-size: 2.4rem;
      color: var(--primary-deep);
      margin-bottom: 12px;
      font-weight: 700;
    }
    .section-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      font-weight: 400;
      margin-bottom: 40px;
    }

    /* 按钮系统 */
    .btn-primary-custom {
      background: var(--cta-terracotta);
      border: none;
      color: white;
      border-radius: 40px;
      padding: 14px 32px;
      font-weight: 600;
      font-size: 1rem;
      transition: var(--transition-base);
      box-shadow: 0 8px 18px rgba(212, 106, 74, 0.2);
    }
    .btn-primary-custom:hover {
      background: #B84E34;
      box-shadow: 0 12px 24px rgba(184, 78, 52, 0.3);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      border-radius: 40px;
      padding: 12px 28px;
      font-weight: 600;
      transition: var(--transition-base);
    }
    .btn-outline-custom:hover {
      background: rgba(26, 60, 64, 0.08);
      color: var(--primary-deep);
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, #FAF7F2 0%, #f5ebd8 100%);
      padding: 100px 0 80px;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary-deep);
      line-height: 1.3;
    }
    .hero-img {
      border-radius: 24px;
      box-shadow: var(--shadow-hover);
      width: 100%;
      height: auto;
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2rem;
      }
    }

    /* 痛点卡片 */
    .pain-card {
      background: var(--card-bg);
      border-radius: 20px;
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--primary-deep);
      transition: var(--transition-base);
      height: 100%;
    }
    .pain-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .pain-icon {
      color: var(--accent-gold);
      font-size: 2rem;
      margin-bottom: 16px;
    }

    /* 方案卡片 */
    .solution-card {
      background: var(--card-bg);
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
      height: 100%;
    }
    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .solution-img {
      height: 200px;
      object-fit: cover;
    }
    .solution-content {
      padding: 28px;
    }

    /* 流程 */
    .step-circle {
      width: 60px;
      height: 60px;
      background: var(--primary-deep);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.4rem;
      margin: 0 auto 12px;
    }
    .step-line {
      border-top: 2px dashed var(--accent-gold);
      width: 60px;
      margin: 0 8px;
      opacity: 0.6;
    }

    /* 数据徽章 */
    .achievement-badge {
      background: rgba(200, 155, 60, 0.08);
      border-radius: 24px;
      padding: 24px 16px;
      text-align: center;
      transition: var(--transition-base);
    }
    .achievement-number {
      font-size: 2.6rem;
      font-weight: 700;
      color: var(--primary-deep);
    }

    /* 证言 */
    .testimonial-card {
      background: #FFFFFF;
      border-radius: 20px;
      padding: 32px;
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--accent-gold);
    }

    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: rgba(26, 60, 64, 0.05);
      color: var(--primary-deep);
      font-weight: 600;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--accent-gold);
    }

    /* CTA 深色区 */
    #cta {
      background: var(--primary-deep);
      color: white;
      padding: 70px 0;
    }
    .cta-input {
      background: rgba(255,255,255,0.15);
      border: none;
      border-radius: 10px;
      padding: 12px 16px;
      color: white;
      width: 100%;
      margin-bottom: 12px;
    }
    .cta-input::placeholder {
      color: rgba(255,255,255,0.7);
    }

    /* 页脚 */
    footer {
      background: #0F2A2E;
      color: #ccc;
      padding: 50px 0 20px;
    }
    .footer-link {
      color: #bbb;
      transition: var(--transition-base);
    }
    .footer-link:hover {
      color: var(--accent-gold);
    }