/* roulang page: index */
:root {
      --primary: #F04E23;
      --primary-glow: rgba(240,78,35,0.55);
      --primary-hover: #FF6B3D;
      --bg-dark: #1A1A1D;
      --bg-card: #3A3A42;
      --white: #F5F5F7;
      --white-soft: rgba(245,245,247,0.8);
      --white-muted: rgba(245,245,247,0.5);
      --border-subtle: rgba(255,255,255,0.08);
      --border-hover: rgba(255,255,255,0.2);
      --green: #00C897;
      --amber: #FFB800;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.5);
      --transition: 0.25s ease;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Inter', 'SF Pro Display', sans-serif;
      background-color: var(--bg-dark);
      color: var(--white-soft);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      background-image: radial-gradient(circle at 50% 20%, rgba(240,78,35,0.08) 0%, transparent 70%);
      background-attachment: fixed;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

    a:hover {
      color: var(--primary-hover);
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26,26,29,0.88);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid var(--border-subtle);
      transition: background 0.3s, box-shadow 0.3s;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 68px;
    }

    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--white);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo span {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }

    .nav-links a {
      color: var(--white-soft);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color var(--transition);
      position: relative;
    }

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

    .btn-nav {
      background: var(--primary);
      color: white !important;
      padding: 8px 20px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background var(--transition), box-shadow var(--transition);
    }

    .btn-nav:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 18px var(--primary-glow);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--white);
      border-radius: 2px;
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 68px;
      left: 0;
      width: 100%;
      background: rgba(26,26,29,0.96);
      backdrop-filter: blur(20px);
      padding: 24px;
      flex-direction: column;
      gap: 20px;
      border-bottom: 1px solid var(--border-subtle);
      z-index: 999;
    }

    .mobile-menu a {
      color: var(--white);
      font-size: 1.1rem;
      font-weight: 500;
    }

    /* Hero */
    #hero {
      padding: 140px 0 100px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      background-attachment: fixed;
    }

    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(26,26,29,0.75) 0%, rgba(26,26,29,0.9) 100%);
      backdrop-filter: blur(2px);
      -webkit-backdrop-filter: blur(2px);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 800px;
      margin: 0 auto;
    }

    .hero-content h1 {
      font-size: clamp(2.4rem, 6vw, 3.6rem);
      font-weight: 800;
      color: var(--white);
      letter-spacing: -0.02em;
      line-height: 1.15;
      text-shadow: 0 0 45px rgba(240,78,35,0.25);
      margin-bottom: 24px;
    }

    .hero-lead {
      font-size: 1.1rem;
      color: var(--white-muted);
      margin-bottom: 36px;
      line-height: 1.7;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: var(--white);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      font-size: 1rem;
      transition: background var(--transition), box-shadow var(--transition);
      box-shadow: 0 4px 14px rgba(240,78,35,0.35);
      text-decoration: none;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 28px var(--primary-glow);
      color: white;
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--white);
      color: var(--white);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      cursor: pointer;
      font-size: 1rem;
      transition: all var(--transition);
      text-decoration: none;
      display: inline-block;
    }

    .btn-outline:hover {
      background: var(--white);
      color: var(--bg-dark);
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 48px;
      height: 4px;
      background: var(--primary);
      border-radius: 2px;
    }

    .text-center .section-title::after {
      left: 50%;
      transform: translateX(-50%);
    }

    .lead {
      color: var(--white-muted);
      font-size: 1rem;
    }

    /* 卡片网格 */
    .grid-3, .grid-4 {
      display: grid;
      gap: 28px;
    }

    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }

    .card {
      background: rgba(58,58,66,0.45);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 28px;
      transition: transform 0.3s, border-color 0.3s;
      box-shadow: var(--shadow-card);
    }

    .card:hover {
      transform: translateY(-6px);
      border-color: var(--border-hover);
    }

    .card-icon {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 16px;
    }

    .card h3 {
      color: var(--white);
      font-weight: 600;
      margin-bottom: 10px;
    }

    .card p {
      color: var(--white-muted);
    }

    .card-cta {
      margin-top: 14px;
      font-weight: 500;
      color: var(--primary);
      display: inline-block;
      position: relative;
    }

    .card-cta::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 1.5px;
      background: var(--primary);
      transition: width 0.25s;
    }

    .card-cta:hover::after {
      width: 100%;
    }

    /* 数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .stat-item {
      text-align: center;
      background: rgba(58,58,66,0.3);
      border-radius: var(--radius-card);
      padding: 28px 16px;
    }

    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--green);
      font-feature-settings: 'tnum';
    }

    .stat-label {
      color: var(--white-muted);
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      position: relative;
    }

    .step {
      text-align: center;
      flex: 1;
    }

    .step-num {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--primary);
      opacity: 0.8;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-subtle);
      padding: 18px 0;
    }

    .faq-question {
      font-weight: 600;
      color: var(--white);
      cursor: pointer;
      display: flex;
      align-items: baseline;
      gap: 10px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--white-muted);
      padding-left: 28px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }

    /* CTA */
    .cta-block {
      background: radial-gradient(circle at 50% 40%, rgba(240,78,35,0.12) 0%, transparent 70%);
      text-align: center;
    }

    /* Footer */
    .site-footer {
      background: #141416;
      padding: 48px 0 24px;
      color: var(--white-muted);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .grid-3, .grid-4, .stats-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .process-steps {
        flex-direction: column;
        gap: 24px;
      }
    }