/* roulang page: index */
:root {
      --primary: #e63946;
      --primary-dark: #b71c2c;
      --accent: #f4a261;
      --bg-dark: #0b0c0e;
      --bg-card: #14161a;
      --bg-section: #0f1114;
      --text-main: #f1f2f4;
      --text-muted: #9ca3af;
      --border-subtle: rgba(255,255,255,0.08);
      --border-active: rgba(230,57,70,0.5);
      --shadow-card: 0 10px 25px -5px rgba(0,0,0,0.7), 0 0 0 1px rgba(230,57,70,0.15);
      --shadow-hover: 0 20px 30px -10px rgba(230,57,70,0.25), 0 0 0 1px rgba(230,57,70,0.4);
      --radius-lg: 1.5rem;
      --radius-md: 1rem;
      --radius-sm: 0.75rem;
      --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      --spacing-section: 5rem;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-dark);
      color: var(--text-main);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(8, 9, 10, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-subtle);
      transition: background 0.3s ease;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.9rem 2rem;
      max-width: 1280px;
      margin: 0 auto;
      flex-wrap: wrap;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #fff 0%, #e63946 70%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: inline-flex;
      align-items: center;
      gap: 0.25rem;
    }
    .logo i {
      background: none;
      -webkit-text-fill-color: var(--primary);
      font-size: 2rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.5rem;
      font-weight: 600;
      font-size: 1rem;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .nav-links a {
      color: var(--text-muted);
      position: relative;
      padding: 0.5rem 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: #fff;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 0.6rem 1.4rem;
      border-radius: 3rem;
      font-weight: 700;
      transition: all 0.25s;
      box-shadow: 0 4px 12px rgba(230,57,70,0.5);
    }

    .nav-cta:hover {
      background: #ff4d5a;
      transform: translateY(-2px);
      box-shadow: 0 12px 18px -5px rgba(230,57,70,0.6);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* 板块通用 */
    section {
      padding: var(--spacing-section) 0;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
      letter-spacing: -0.5px;
    }
    .accent-text {
      color: var(--primary);
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 1.2rem;
      margin-bottom: 3rem;
    }

    /* 首屏 */
    .hero {
      position: relative;
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0b0c0e 0%, #1f1a1a 100%);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      margin-top: 70px;
      border-bottom: 1px solid var(--border-subtle);
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(230,57,70,0.25) 0%, transparent 60%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }

    .hero h1 {
      font-size: 4rem;
      font-weight: 800;
      line-height: 1.1;
      text-transform: uppercase;
      letter-spacing: -1px;
      margin-bottom: 1.5rem;
    }
    .hero .highlight {
      color: var(--primary);
      text-shadow: 0 0 15px rgba(230,57,70,0.7);
    }

    .hero p {
      font-size: 1.3rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2rem;
    }

    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .btn {
      display: inline-block;
      padding: 0.85rem 2.2rem;
      border-radius: 3rem;
      font-weight: 700;
      font-size: 1rem;
      transition: all 0.25s;
      border: none;
      cursor: pointer;
      text-align: center;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 10px 20px -8px rgba(230,57,70,0.6);
    }
    .btn-primary:hover {
      background: #ff4d5a;
      transform: translateY(-3px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.3);
      color: white;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      background: rgba(230,57,70,0.15);
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 2rem 1.5rem;
      border: 1px solid var(--border-subtle);
      transition: all 0.3s ease;
      box-shadow: var(--shadow-card);
    }
    .card:hover {
      transform: translateY(-8px);
      border-color: var(--border-active);
      box-shadow: var(--shadow-hover);
    }
    .card i {
      font-size: 2.5rem;
      color: var(--primary);
      margin-bottom: 1.5rem;
    }
    .card h3 {
      font-size: 1.5rem;
      margin-bottom: 0.8rem;
    }
    .card p {
      color: var(--text-muted);
    }

    /* 图文区块 */
    .split-block {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .split-img img {
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 35px rgba(0,0,0,0.8);
      border: 1px solid rgba(230,57,70,0.2);
    }

    /* 数据条 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      background: linear-gradient(145deg, #1e1f24, #0f1114);
      border-radius: var(--radius-lg);
      padding: 2.5rem 2rem;
      margin: 2rem 0;
      border: 1px solid var(--border-subtle);
    }
    .stat-item h4 {
      font-size: 2.8rem;
      color: var(--primary);
      font-weight: 800;
    }

    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 1.5rem;
      margin-bottom: 1rem;
      border-left: 4px solid var(--primary);
      transition: 0.2s;
    }
    .faq-item h4 {
      font-size: 1.25rem;
      margin-bottom: 0.5rem;
    }

    /* CTA */
    .cta-band {
      background: radial-gradient(circle at 20% 30%, #2d1a1c, #0a0b0c);
      border-radius: var(--radius-lg);
      padding: 4rem 2rem;
      text-align: center;
      border: 1px solid var(--border-active);
    }

    .footer {
      background: #030405;
      padding: 3rem 0;
      color: var(--text-muted);
      border-top: 1px solid var(--border-subtle);
      font-size: 0.95rem;
    }
    .footer-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .split-block { grid-template-columns: 1fr; }
      .hero h1 { font-size: 3rem; }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        background: #0b0c0e;
        padding: 1.5rem 0;
      }
      .nav-links.active-mobile {
        display: flex;
      }
      .menu-toggle { display: block; }
      .grid-3 { grid-template-columns: 1fr; }
      .stats-row { flex-wrap: wrap; gap: 2rem; }
      .hero h1 { font-size: 2.5rem; }
    }