/* roulang page: index */
:root {
      --primary: #1A5F7A;
      --primary-dark: #154E63;
      --deep-bg: #0F3B4C;
      --gold: #E8B931;
      --gold-dark: #D4A017;
      --bg: #F7F9FC;
      --white: #FFFFFF;
      --text: #1E293B;
      --text-secondary: #475569;
      --text-muted: #94A3B8;
      --border: #E2E8F0;
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.10);
      --radius-lg: 12px;
      --radius-md: 8px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition: 0.25s ease;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 600;
      line-height: 1.3;
    }

    h1 {
      font-size: 40px;
      font-weight: 700;
    }
    h2 {
      font-size: 30px;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
    }
    h4 {
      font-size: 16px;
      font-weight: 600;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      font-weight: 500;
      border: none;
      outline: none;
      transition: var(--transition);
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      width: 100%;
      background: var(--white);
      height: 64px;
      box-shadow: 0 1px 4px rgba(0,0,0,0.05);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: 2px;
    }
    .logo span {
      color: var(--deep-bg);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 15px;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }

    .hamburger {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      color: var(--text);
    }

    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-md);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
    }

    .btn-gold {
      background: linear-gradient(135deg, var(--gold) 0%, var(--gold-dark) 100%);
      color: #0F3B4C;
      box-shadow: 0 4px 12px rgba(232,185,49,0.3);
    }
    .btn-gold:hover {
      filter: brightness(1.08);
      box-shadow: 0 6px 18px rgba(232,185,49,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-md);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: #F0F4F8;
    }

    .btn-white-outline {
      background: transparent;
      border: 1px solid white;
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
    }
    .btn-white-outline:hover {
      background: rgba(255,255,255,0.15);
    }

    /* Hero */
    .hero {
      margin-top: 64px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      min-height: 580px;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(15,59,76,0.65) 0%, rgba(15,59,76,0.25) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      gap: 32px;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero-text h1 {
      font-size: 42px;
      margin-bottom: 20px;
      line-height: 1.2;
      text-shadow: 0 4px 12px rgba(0,0,0,0.4);
    }
    .hero-sub {
      font-size: 18px;
      margin-bottom: 28px;
      opacity: 0.9;
      max-width: 550px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
    }
    .hero-image img {
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 35px rgba(0,0,0,0.3);
      max-height: 360px;
      object-fit: cover;
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      color: var(--deep-bg);
    }
    .section-title p {
      color: var(--text-secondary);
      font-size: 17px;
      max-width: 600px;
      margin: 0 auto;
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--white);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .card-img {
      height: 200px;
      object-fit: cover;
    }
    .card-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .card-body h3 {
      margin-bottom: 8px;
    }
    .card-desc {
      color: var(--text-secondary);
      font-size: 15px;
      margin-bottom: 16px;
      line-height: 1.5;
    }
    .card-link {
      color: var(--primary);
      font-weight: 600;
      margin-top: auto;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 场景左右交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-text {
      flex: 1;
    }
    .scenario-text h3 {
      margin-bottom: 12px;
      color: var(--deep-bg);
    }
    .scenario-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border);
      background: #f1f5f9;
    }

    /* 案例 */
    .case-card {
      text-align: center;
      padding: 28px 20px;
    }
    .client-logo {
      width: 64px;
      height: 64px;
      background: #e9eef3;
      border-radius: 50%;
      margin: 0 auto 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: var(--primary);
    }
    .quote {
      font-style: italic;
      color: var(--text-secondary);
      margin: 12px 0;
    }
    .data-highlight {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
    }

    /* 价格卡 */
    .pricing-card {
      position: relative;
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border);
    }
    .pricing-card.recommended {
      border: 2px solid var(--gold);
      transform: scale(1.02);
    }
    .badge {
      background: var(--gold);
      color: #0F3B4C;
      font-weight: 700;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 13px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    .price {
      font-size: 40px;
      font-weight: 700;
      color: var(--deep-bg);
      margin: 16px 0;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border);
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 18px 0;
      font-size: 17px;
      font-weight: 500;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F8FAFC;
      border-radius: 0 0 8px 8px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 16px;
    }

    /* CTA横幅 */
    .cta-banner {
      background: var(--primary);
      padding: 72px 0;
      text-align: center;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: var(--deep-bg);
      color: #CBD5E1;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer a {
      color: #CBD5E1;
    }
    .footer a:hover {
      color: white;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .scenario-row { flex-direction: column; gap: 24px; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-text h1 { font-size: 32px; }
      .grid-3 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      section { padding: 60px 0; }
    }