/* roulang page: index */
:root {
      --primary: #0B2B1F;
      --primary-light: #143D2C;
      --accent: #D97A4A;
      --accent-hover: #c16a3c;
      --gold: #C9A96E;
      --bg: #FAF9F7;
      --bg-alt: #F5F4F1;
      --text: #3A3A3A;
      --text-muted: #6B6B6B;
      --border-light: #EAE9E6;
      --white: #FFFFFF;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Inter", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: opacity 0.25s ease;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 40px;
      padding-right: 40px;
    }
    @media (max-width: 768px) {
      .container {
        padding-left: 20px;
        padding-right: 20px;
      }
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      z-index: 999;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 40px;
      border-bottom: 1px solid transparent;
      transition: all 0.3s ease;
    }
    .navbar.scrolled {
      background: rgba(255,255,255,0.96);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 4px 16px rgba(0,0,0,0.03);
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.02em;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo span {
      color: var(--accent);
      font-weight: 700;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
      font-size: 16px;
      color: var(--text);
    }
    .nav-links a {
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--primary);
      cursor: pointer;
      padding: 8px;
    }
    @media (max-width: 768px) {
      .navbar {
        height: 64px;
        padding: 0 20px;
      }
      .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
        padding: 28px 32px;
        display: none;
        box-shadow: 0 12px 28px rgba(0,0,0,0.06);
        border-bottom: 1px solid var(--border-light);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
    }
    /* 按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-weight: 600;
      font-size: 16px;
      border-radius: var(--radius-btn);
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
      letter-spacing: 0.3px;
      gap: 6px;
      white-space: nowrap;
    }
    .btn-primary {
      background-color: var(--accent);
      color: white;
      box-shadow: 0 6px 16px rgba(217,122,74,0.18);
    }
    .btn-primary:hover {
      background-color: var(--accent-hover);
      box-shadow: 0 10px 24px rgba(217,122,74,0.28);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 1.5px solid var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }
    .btn-light {
      background: white;
      color: var(--primary);
      font-weight: 600;
    }
    .btn-light:hover {
      background: var(--bg-alt);
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center 30%;
      position: relative;
      margin-top: 72px;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(11,27,31,0.8) 0%, rgba(11,27,31,0.45) 60%, rgba(11,27,31,0.25) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      padding: 20px 0;
    }
    .hero h1 {
      font-size: 68px;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.15;
      margin-bottom: 24px;
      color: white;
      text-shadow: 0 8px 24px rgba(0,0,0,0.25);
    }
    .hero h1 span {
      color: var(--accent);
    }
    .hero p {
      font-size: 20px;
      line-height: 1.6;
      color: rgba(255,255,255,0.9);
      margin-bottom: 36px;
      max-width: 540px;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    @media (max-width: 768px) {
      .hero {
        margin-top: 64px;
        background-position: right 35%;
      }
      .hero h1 {
        font-size: 42px;
      }
      .hero p {
        font-size: 17px;
      }
    }
    /* 通用板块 */
    section {
      padding: 120px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    .section-title {
      font-size: 44px;
      font-weight: 600;
      letter-spacing: -0.01em;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 18px;
      margin-bottom: 56px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    @media (max-width: 768px) {
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
    }
    /* 卡片 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-light);
      transition: all 0.3s ease;
      height: 100%;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
    }
    .icon-accent {
      color: var(--accent);
      font-size: 36px;
      margin-bottom: 20px;
    }
    .card h3 {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--primary);
    }
    .stat-number {
      font-size: 56px;
      font-weight: 700;
      color: var(--accent);
    }
    /* 图文交替 */
    .split-block {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 60px;
      align-items: center;
    }
    .split-block.reverse {
      grid-template-columns: 1.2fr 1fr;
    }
    .split-image img {
      border-radius: 16px;
      width: 100%;
      object-fit: cover;
    }
    @media (max-width: 768px) {
      .split-block, .split-block.reverse {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .split-block.reverse .split-image {
        order: -1;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      font-size: 19px;
      font-weight: 600;
      color: var(--primary);
      text-align: left;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      padding: 8px 0;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text);
      padding-right: 20px;
    }
    .faq-answer.open {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA 深色块 */
    .cta-dark {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 90px 20px;
      border-radius: 24px;
      margin: 40px 0;
      position: relative;
      overflow: hidden;
    }
    .footer {
      background: #1A1A1A;
      color: #AAAAAA;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }