/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary: #E8452D;
      --primary-dark: #C93020;
      --deep: #1E1E1E;
      --white: #FFFFFF;
      --soft-bg: #F7F7F5;
      --card: #FFFFFF;
      --text-primary: #1E1E1E;
      --text-body: #333333;
      --text-muted: #666666;
      --text-light: #999999;
      --border-light: #E5E5E5;
      --accent: #00B383;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-light: 0 1px 3px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.10);
      --font-title: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-number: "DIN Alternate", "Roboto", sans-serif;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    body {
      font-family: var(--font-title);
      background-color: var(--soft-bg);
      color: var(--text-body);
      line-height: 1.75;
      font-weight: 400;
      letter-spacing: 0.01em;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      font-weight: 600;
      border: none;
      outline: none;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      letter-spacing: 0.01em;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    h1, h2, h3 {
      font-family: var(--font-title);
      color: var(--text-primary);
    }
    h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -0.02em;
      color: #1E1E1E;
    }
    h2 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.25;
      margin-bottom: 12px;
    }
    .section-subtitle {
      font-size: 16px;
      font-weight: 400;
      color: var(--text-muted);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
    }
    @media (max-width: 768px) {
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 28px;
      }
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: #FFFFFF;
      box-shadow: 0 1px 4px rgba(0,0,0,0.06);
      z-index: 999;
      display: flex;
      align-items: center;
      transition: var(--transition);
    }
    .navbar.scrolled {
      box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: baseline;
    }
    .logo span {
      font-weight: 600;
      color: var(--deep);
    }
    .nav-menu {
      display: flex;
      gap: 32px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: #333;
      padding: 8px 0;
      position: relative;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--primary);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--deep);
      border-radius: 5px;
      transition: var(--transition);
    }
    @media (max-width: 1024px) {
      .nav-menu {
        gap: 24px;
      }
    }
    @media (max-width: 768px) {
      .navbar {
        height: 60px;
      }
      .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        height: calc(100vh - 60px);
        background: white;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 28px;
        transform: translateX(100%);
        transition: transform 0.3s ease;
      }
      .nav-menu.open {
        transform: translateX(0);
      }
      .nav-link {
        font-size: 20px;
      }
      .hamburger {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: #FFFFFF;
      margin-top: 72px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      width: 100%;
      gap: 0;
    }
    .hero-left {
      flex: 5;
      max-width: 520px;
      padding-right: 40px;
    }
    .hero-right {
      flex: 7;
      position: relative;
      height: 560px;
      overflow: hidden;
      border-radius: 24px 0 0 24px;
    }
    .hero-right img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .hero-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 140px;
      height: 140px;
      background: rgba(232,69,45,0.18);
      clip-path: polygon(0 0, 0% 100%, 100% 0);
    }
    .hero h1 {
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.6;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      box-shadow: 0 4px 8px rgba(232,69,45,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 8px 18px rgba(232,69,45,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 30px;
      border-radius: var(--radius-btn);
    }
    .btn-outline:hover {
      background: rgba(232,69,45,0.08);
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
    }
    .btn-ghost:hover {
      background: rgba(255,255,255,0.15);
    }
    @media (max-width: 1024px) {
      .hero-right {
        height: 460px;
      }
    }
    @media (max-width: 768px) {
      .hero {
        min-height: auto;
      }
      .hero-grid {
        flex-direction: column;
        padding: 30px 0;
      }
      .hero-left {
        max-width: 100%;
        padding-right: 0;
        margin-bottom: 30px;
      }
      .hero-right {
        width: 100%;
        height: 320px;
        border-radius: 16px;
      }
    }

    section {
      padding: 120px 0;
    }
    .bg-deep {
      background: var(--deep);
      color: white;
    }
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .advantage-card {
      background: var(--card);
      padding: 32px;
      border-radius: var(--radius-card);
      transition: var(--transition);
      box-shadow: var(--shadow-light);
    }
    .advantage-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .advantage-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .advantage-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .advantage-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    @media (max-width: 1024px) {
      .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
    }

    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .masonry-card {
      break-inside: avoid;
      margin-bottom: 24px;
      border-radius: var(--radius-card);
      overflow: hidden;
      position: relative;
      background: #ccc;
    }
    .masonry-card img {
      width: 100%;
      display: block;
    }
    .masonry-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      padding: 24px 20px;
      background: linear-gradient(0deg, rgba(0,0,0,0.75) 0%, transparent 100%);
      color: white;
    }
    .masonry-overlay h3 {
      color: white;
      font-size: 20px;
      margin-bottom: 4px;
    }
    .masonry-overlay p {
      font-size: 13px;
      opacity: 0.9;
    }
    @media (max-width: 768px) {
      .masonry {
        columns: 1;
      }
    }

    .plans-table {
      width: 100%;
      border-collapse: collapse;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
    }
    .plans-table th, .plans-table td {
      padding: 18px 24px;
      text-align: left;
      border-bottom: 1px solid var(--border-light);
    }
    .plans-table th {
      background: var(--primary);
      color: white;
      font-weight: 600;
      font-size: 15px;
    }
    .plans-table td:first-child {
      font-weight: 600;
    }
    .badge-hot {
      background: var(--accent);
      color: white;
      border-radius: 20px;
      padding: 3px 12px;
      font-size: 12px;
      margin-left: 8px;
    }
    @media (max-width: 768px) {
      .plans-table {
        display: none;
      }
      .plan-cards {
        display: flex;
        flex-direction: column;
        gap: 24px;
      }
      .plan-card-item {
        background: white;
        padding: 28px;
        border-radius: var(--radius-card);
        box-shadow: var(--shadow-light);
      }
    }
    @media (min-width: 769px) {
      .plan-cards {
        display: none;
      }
    }

    .faq-block {
      background: var(--deep);
      padding: 100px 0;
    }
    .faq-item {
      background: #2A2A2A;
      border-radius: var(--radius-btn);
      margin-bottom: 12px;
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      color: white;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #1E1E1E;
      color: #CCCCCC;
      font-size: 15px;
      line-height: 1.8;
      padding: 0 20px;
    }
    .faq-item.open .faq-answer {
      padding: 0 20px 20px;
    }

    .cta-banner {
      background: var(--primary);
      text-align: center;
      padding: 100px 20px;
    }
    .footer {
      background: #1E1E1E;
      color: #CCCCCC;
      padding: 60px 0 0;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-bottom {
      background: #111111;
      color: #888;
      text-align: center;
      padding: 18px 0;
      margin-top: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }