/* roulang page: index */
:root {
      --primary: #1A1F36;
      --secondary: #C9A96E;
      --accent: #E85D3A;
      --bg-light: #F7F5F0;
      --bg-card: #ffffff;
      --bg-muted: #F0EEE8;
      --text-primary: #1A1F36;
      --text-secondary: #5A5E6B;
      --text-muted: #8A8D98;
      --border-light: #E8E5DD;
      --shadow-sm: 0 4px 20px rgba(26, 31, 54, 0.06);
      --shadow-md: 0 8px 30px rgba(26, 31, 54, 0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --spacing-section: 5rem;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-family: var(--font-heading);
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: 2.8rem;
      line-height: 1.3;
    }

    h2 {
      font-size: 1.9rem;
      margin-bottom: 1rem;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.2s;
    }
    a:hover {
      color: var(--accent);
    }

    .btn {
      border-radius: var(--radius-sm);
      padding: 0.7rem 1.8rem;
      font-weight: 600;
      transition: all 0.25s ease;
      border: 1px solid transparent;
    }
    .btn-primary {
      background-color: var(--accent);
      border-color: var(--accent);
      color: #fff;
    }
    .btn-primary:hover, .btn-primary:focus {
      background-color: #D14A2A;
      border-color: #D14A2A;
      color: #fff;
      box-shadow: 0 6px 18px rgba(232, 93, 58, 0.3);
    }
    .btn-outline-secondary {
      border-color: var(--secondary);
      color: var(--secondary);
      background: transparent;
    }
    .btn-outline-secondary:hover {
      background-color: var(--secondary);
      color: #fff;
      border-color: var(--secondary);
    }
    .btn-lg {
      padding: 0.85rem 2.2rem;
      font-size: 1.1rem;
    }

    /* 导航 */
    .navbar {
      background-color: #ffffff;
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
      padding: 0.8rem 0;
      transition: box-shadow 0.2s;
    }
    .navbar.scrolled {
      box-shadow: 0 4px 18px rgba(0,0,0,0.06);
    }
    .navbar-brand {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary) !important;
      letter-spacing: 1px;
    }
    .navbar-nav .nav-link {
      color: var(--text-primary) !important;
      font-weight: 500;
      margin: 0 0.3rem;
      padding: 0.5rem 1rem;
      border-radius: 6px;
    }
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--accent) !important;
      background-color: rgba(232,93,58,0.05);
    }
    .navbar-toggler {
      border: none;
      color: var(--primary);
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }

    /* Hero */
    #hero {
      padding: 3rem 0 4rem;
      background-color: #ffffff;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 700;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin: 1.2rem 0 1rem;
    }
    .hero-pain {
      color: var(--accent);
      font-weight: 500;
      margin-bottom: 2rem;
    }
    .hero-image {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      max-width: 100%;
      height: auto;
    }

    /* 通用区块 */
    section {
      padding: var(--spacing-section) 0;
    }
    .section-title {
      margin-bottom: 3rem;
    }

    .card-custom {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      height: 100%;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .icon-circle {
      width: 56px;
      height: 56px;
      background-color: #F7F3EB;
      color: var(--secondary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      margin-bottom: 1.2rem;
    }

    /* 痛点卡片 */
    .pain-card {
      background: #F0EEE8;
      border: none;
    }

    /* 优势四列 */
    .adv-card {
      text-align: center;
    }
    .adv-card .icon-circle {
      margin-left: auto;
      margin-right: auto;
    }

    /* 流程 */
    .process-step {
      position: relative;
      text-align: center;
    }
    .step-number {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.4rem;
      margin: 0 auto 1rem;
    }
    .process-line {
      position: absolute;
      top: 24px;
      left: 65%;
      width: 70%;
      height: 2px;
      background: repeating-linear-gradient(90deg, var(--secondary) 0px, var(--secondary) 6px, transparent 6px, transparent 12px);
      z-index: 0;
    }
    @media (max-width: 767px) {
      .process-line {
        display: none;
      }
    }

    /* 数据块 */
    .big-number {
      font-size: 3.8rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.1;
    }

    /* 证言 */
    .testimonial-card {
      background: #fff;
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
    }
    .avatar {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      object-fit: cover;
    }

    /* FAQ */
    .accordion-button {
      background-color: #F0EEE8;
      color: var(--text-primary);
      font-weight: 600;
      box-shadow: none;
      border-radius: var(--radius-sm) !important;
      padding: 1.2rem 1.5rem;
    }
    .accordion-button:not(.collapsed) {
      background-color: #F7F3EB;
      color: var(--secondary);
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--secondary);
    }
    .accordion-item {
      border: 1px solid var(--border-light);
      margin-bottom: 0.8rem;
      border-radius: var(--radius-sm);
    }

    /* CTA 深色块 */
    .cta-dark {
      background-color: var(--primary);
      color: #fff;
      border-radius: var(--radius-lg);
      padding: 4rem 2rem;
      text-align: center;
    }
    .cta-dark h2 {
      color: #fff;
    }
    .cta-sub {
      color: rgba(255,255,255,0.8);
    }

    footer {
      background-color: #151A2E;
      color: #ccc;
      padding: 3rem 0 1.5rem;
    }
    footer a {
      color: #ccc;
    }
    footer a:hover {
      color: var(--secondary);
    }
    .footer-brand {
      font-weight: 700;
      font-size: 1.6rem;
      color: #fff;
    }
    .social-icon {
      font-size: 1.4rem;
      margin-right: 1rem;
      color: var(--secondary);
    }

    @media (max-width: 768px) {
      h1 { font-size: 2.2rem; }
      h2 { font-size: 1.6rem; }
      .hero-title { font-size: 2.2rem; }
      .navbar-collapse { background: #fff; padding: 1rem; border-radius: 8px; margin-top: 0.5rem; }
      section { padding: 3rem 0; }
      .process-step { margin-bottom: 2rem; }
    }