/* roulang page: index */
/* 设计变量与基础重置 */
    :root {
      --primary: #E60012;
      --primary-dark: #CC0010;
      --primary-glow: rgba(230, 0, 18, 0.7);
      --accent: #00E5FF;
      --accent-glow: rgba(0, 229, 255, 0.5);
      --gold: #FFD700;
      --dark-bg: #1A1A1A;
      --darker-bg: #0D0D0D;
      --card-bg: #2A2A2A;
      --card-hover: #3A3A3A;
      --text-light: #F2F2F2;
      --text-muted: #999;
      --border-color: #333;
      --radius-card: 12px;
      --radius-btn: 6px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.25);
      --shadow-hover: 0 12px 32px rgba(230,0,18,0.3);
      --transition: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: 'Noto Sans SC', 'Inter', sans-serif;
      background-color: var(--dark-bg);
      color: var(--text-light);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

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

    button, input, select, textarea {
      font-family: inherit;
    }

    /* 自定义容器 */
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航样式 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(26, 26, 26, 0.85);
      backdrop-filter: blur(12px);
      display: flex;
      align-items: center;
      z-index: 50;
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }

    .navbar.scrolled {
      background: rgba(13, 13, 13, 0.98);
      box-shadow: 0 2px 24px rgba(0,0,0,0.6);
    }

    .nav-logo {
      font-weight: 800;
      font-size: 1.75rem;
      letter-spacing: -0.02em;
      color: white;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .nav-logo span {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      margin-left: auto;
      align-items: center;
    }

    .nav-links a {
      color: white;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 0.25rem 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }

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

    .btn-primary-outline {
      border: 1.5px solid var(--primary);
      color: white;
      background: transparent;
      padding: 0.5rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition);
      display: inline-block;
      text-align: center;
    }

    .btn-primary-outline:hover {
      background: var(--primary);
      box-shadow: 0 0 14px var(--primary-glow);
    }

    .btn-primary-fill {
      background: var(--primary);
      color: white;
      border: none;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition);
      display: inline-block;
      text-align: center;
      cursor: pointer;
    }

    .btn-primary-fill:hover {
      background: var(--primary-dark);
      box-shadow: 0 0 20px var(--primary-glow);
    }

    /* 汉堡菜单 */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: white;
      border-radius: 4px;
      transition: all 0.3s;
    }

    /* Hero 区域 */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
      background: radial-gradient(circle at 20% 20%, #2a0a0a, #0d0d0d 80%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: white;
    }
    .hero-title strong {
      color: var(--primary);
    }

    .hero-sub {
      font-size: 1.25rem;
      color: #ccc;
      margin: 1.5rem 0 2rem;
    }

    .hero-visual {
      position: relative;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 0 40px rgba(230,0,18,0.4);
    }

    .hero-visual img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .overlay-gradient {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,26,26,0.5), rgba(0,0,0,0.7));
    }

    /* 亮点网格 */
    .stat-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .stat-card {
      background: var(--card-bg);
      padding: 2rem 1.5rem;
      border-radius: var(--radius-card);
      text-align: center;
      transition: var(--transition);
    }
    .stat-card:hover {
      background: var(--card-hover);
      transform: translateY(-4px);
    }
    .stat-number {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--accent);
      line-height: 1.2;
    }
    .stat-label {
      font-weight: 600;
      margin-top: 0.5rem;
      color: white;
    }

    /* 荣誉瀑布流 */
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: #1e1e1e;
      border-radius: 8px;
      overflow: hidden;
      border: 1px solid #333;
      transition: all var(--transition);
    }
    .masonry-item:hover {
      transform: scale(1.02);
      box-shadow: 0 8px 24px rgba(230,0,18,0.25);
    }
    .masonry-item img {
      width: 100%;
      display: block;
    }
    .honor-info {
      padding: 1rem;
      background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    }
    .honor-tag {
      background: var(--gold);
      color: #1a1a1a;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-weight: 700;
      font-size: 0.8rem;
      display: inline-block;
    }

    /* 方案对比卡 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pricing-card {
      background: #1E1E1E;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .pricing-card.featured {
      background: #2A1A1A;
      box-shadow: 0 12px 32px rgba(230,0,18,0.35);
      border: 1px solid var(--primary);
    }
    .badge-popular {
      background: var(--primary);
      color: white;
      padding: 0.2rem 1rem;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
    }

    /* FAQ 手风琴 */
    .faq-item {
      background: #1E1E1E;
      border-radius: 12px;
      margin-bottom: 1rem;
      overflow: hidden;
      transition: background 0.3s;
    }
    .faq-question {
      padding: 1.2rem;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: #1E1E1E;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #2A2A2A;
      padding: 0 1.2rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 1.2rem;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #1A1A1A 0%, #3A0A0A 100%);
      border-radius: 24px;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .masonry { columns: 2; }
      .pricing-grid { grid-template-columns: 1fr; }
      .stat-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-title { font-size: 2rem; }
      .stat-grid { grid-template-columns: 1fr; }
      .masonry { columns: 1; }
    }

    .mobile-menu {
      display: none;
      position: fixed; top:0; left:0; width:100%; height:100%;
      background: #0D0D0D; z-index: 60; flex-direction: column; justify-content: center; align-items: center; gap:2rem;
    }
    .mobile-menu a { font-size: 1.5rem; color: white; }
    .mobile-menu.active { display: flex; }
    .close-btn { position: absolute; top:2rem; right:2rem; font-size: 2rem; }