/* roulang page: index */
:root {
      --primary: #1A2B4C;
      --primary-hover: #0F1E38;
      --accent-gold: #C49A2B;
      --accent-red: #D94E3C;
      --bg-soft: #EAF0F6;
      --white: #FFFFFF;
      --text-dark: #1E1E1E;
      --text-mid: #5A5A5A;
      --text-light: #B0BEC5;
      --success: #2E7D32;
      --warning: #C62828;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-btn: 6px;
      --shadow-card: 0 4px 20px rgba(26,43,76,0.06);
      --shadow-hover: 0 8px 30px rgba(26,43,76,0.12);
      --transition: 0.2s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-digit: "DIN Alternate", "Roboto", system-ui;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-soft);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      z-index: 100;
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
      transition: var(--transition);
    }
    .site-header.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), #2A3F5C);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-gold);
      font-weight: 700;
      font-size: 18px;
      position: relative;
    }
    .logo-icon::after {
      content: "MK";
      position: absolute;
      font-size: 14px;
      font-weight: 800;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-dark);
      font-weight: 500;
      font-size: 16px;
      transition: color var(--transition);
    }
    .nav-links a:hover {
      color: var(--accent-gold);
    }
    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background var(--transition);
    }
    .nav-cta:hover {
      background: var(--primary-hover);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: var(--transition);
    }
    .mobile-menu {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: var(--bg-soft);
      padding: 32px;
      display: none;
      flex-direction: column;
      gap: 24px;
      z-index: 99;
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    .mobile-menu a {
      font-size: 18px;
      font-weight: 500;
      color: var(--text-dark);
      text-decoration: none;
      border-bottom: 1px solid rgba(0,0,0,0.08);
      padding-bottom: 12px;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu.active {
        display: flex;
      }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.3;
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 28px;
      }
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: var(--bg-soft);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 60px;
      align-items: center;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-mid);
      margin-bottom: 32px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      align-items: center;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      transition: background var(--transition);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
    }
    .btn-outline {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      background: transparent;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .btn-accent {
      background: var(--accent-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: background var(--transition);
    }
    .btn-accent:hover {
      background: #b83a2b;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-lg);
      height: 420px;
      box-shadow: var(--shadow-card);
      position: relative;
    }
    @media (max-width: 992px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-image {
        height: 300px;
        order: -1;
      }
      .btn-group {
        justify-content: center;
      }
    }
    /* 亮点网格 */
    .features {
      background: var(--white);
    }
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .feature-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: left;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 36px;
      color: var(--accent-gold);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
      color: var(--primary);
    }
    @media (max-width: 992px) {
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 576px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 案例瀑布 */
    .cases {
      background: var(--bg-soft);
    }
    .waterfall {
      column-count: 3;
      column-gap: 24px;
      margin-top: 40px;
    }
    .case-card {
      background: var(--white);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      margin-bottom: 24px;
      break-inside: avoid;
      transition: var(--transition);
      display: inline-block;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }
    .case-content {
      padding: 20px;
    }
    .case-tag {
      color: var(--accent-red);
      font-size: 13px;
      font-weight: 600;
    }
    @media (max-width: 992px) {
      .waterfall {
        column-count: 2;
      }
    }
    @media (max-width: 576px) {
      .waterfall {
        column-count: 1;
      }
    }
    /* 方案对比 */
    .pricing {
      background: var(--white);
    }
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .plan-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      border: 1px solid transparent;
      transition: var(--transition);
    }
    .plan-card.recommend {
      border-color: var(--primary);
      background: #f6f9ff;
      transform: scale(1.03);
    }
    .plan-name {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
    }
    .plan-price {
      font-size: 28px;
      font-weight: 700;
      color: var(--accent-gold);
      margin: 16px 0;
    }
    .plan-features {
      list-style: none;
      margin: 24px 0;
    }
    .plan-features li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    @media (max-width: 768px) {
      .compare-grid {
        grid-template-columns: 1fr;
        overflow-x: auto;
        display: flex;
        gap: 16px;
        scroll-snap-type: x mandatory;
      }
      .plan-card {
        min-width: 260px;
        scroll-snap-align: start;
      }
      .plan-card.recommend {
        transform: none;
      }
    }
    /* FAQ */
    .faq {
      background: var(--bg-soft);
    }
    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }
    .faq-item {
      background: var(--white);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-mid);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA 横幅 */
    .cta-band {
      background: var(--primary);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .cta-band h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }
    /* 页脚 */
    .footer {
      background: #1A2B4C;
      color: var(--text-light);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: var(--text-light);
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--accent-gold);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }