/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-dark: #C1121F;
      --accent: #F4A261;
      --bg-dark: #0B0C10;
      --card-bg: #1A1B1E;
      --light-bg: #F8F9FA;
      --text-light: #E9ECEF;
      --text-muted: #ADB5BD;
      --white: #FFFFFF;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-accent: rgba(244, 162, 97, 0.3);
      --radius-card: 16px;
      --radius-btn: 12px;
      --shadow-card: 0 10px 30px -10px rgba(0,0,0,0.6);
      --shadow-glow: 0 0 25px rgba(230, 57, 70, 0.55);
      --transition-default: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-light);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 700;
      transition: var(--transition-default);
      border: none;
      outline: none;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(11, 12, 16, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-subtle);
      padding: 16px 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 600;
      color: var(--text-muted);
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-links a:hover {
      color: var(--white);
    }
    .btn-nav {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 700;
      box-shadow: 0 4px 14px rgba(230,57,70,0.4);
    }
    .btn-nav:hover {
      background: var(--primary-dark);
      box-shadow: var(--shadow-glow);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--white);
      border-radius: 4px;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(11,12,16,0.98);
      backdrop-filter: blur(20px);
      z-index: 60;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
    }
    .mobile-menu a {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--text-light);
    }
    .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      background: transparent;
      border: none;
      color: white;
      font-size: 2.2rem;
    }
    /* 区块 */
    section {
      padding: 100px 0;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      box-shadow: 0 8px 18px rgba(230,57,70,0.35);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: var(--shadow-glow);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
    }
    .btn-secondary:hover {
      background: var(--accent);
      color: var(--bg-dark);
    }
    .card-dark {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--border-subtle);
      transition: var(--transition-default);
    }
    .card-dark:hover {
      border-color: var(--border-accent);
      box-shadow: var(--shadow-card);
    }
    h1, h2, h3 {
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.2;
    }
    .section-title {
      font-size: 2.5rem;
      margin-bottom: 16px;
      color: var(--white);
    }
    .gradient-text {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      section { padding: 72px 0; }
      .section-title { font-size: 2rem; }
      .container { padding: 0 20px; }
    }

@media (max-width: 768px) {
            #results .container > div {
              grid-template-columns: 1fr 1fr;
              grid-template-rows: auto;
            }
            #results .card-dark:first-child { grid-column: span 2; }
          }

@media (max-width: 640px){ #faq .container > div { grid-template-columns: 1fr; } }