/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --primary-dark: #5A1FD6;
      --accent: #00E5FF;
      --bg-deep: #0A0E17;
      --card-bg: #141A26;
      --text-main: #F0F2F5;
      --text-muted: #8891A5;
      --success: #00F0A8;
      --live-red: #FF3B5C;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 4px 24px rgba(123, 47, 247, 0.12);
      --shadow-hover: 0 8px 32px rgba(123, 47, 247, 0.25), 0 0 0 1px rgba(0, 229, 255, 0.4);
      --font-numbers: 'DIN Alternate', 'Bebas Neue', 'Oswald', sans-serif;
      --transition: all 0.25s ease;
      --max-width: 1280px;
    }

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

    body {
      background-color: var(--bg-deep);
      color: var(--text-muted);
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 按钮基础 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      cursor: pointer;
      border: none;
      font-family: inherit;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: white;
      padding: 14px 32px;
      box-shadow: 0 4px 14px rgba(123, 47, 247, 0.4);
    }

    .btn-primary:hover {
      filter: brightness(1.2);
      box-shadow: 0 6px 20px rgba(123, 47, 247, 0.6);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent);
      color: var(--accent);
      padding: 14px 32px;
    }

    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.08);
      box-shadow: 0 0 16px rgba(0, 229, 255, 0.25);
    }

    .btn-lg {
      padding: 18px 40px;
      font-size: 18px;
    }

    /* 导航栏 */
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10, 14, 23, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(123, 47, 247, 0.25);
      transition: var(--transition);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 24px;
      max-width: var(--max-width);
      margin: 0 auto;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.5rem;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
    }

    .logo .icon {
      color: var(--primary);
      font-size: 1.8rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
    }

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

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.3s ease;
    }

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

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

    .hamburger span {
      width: 25px;
      height: 3px;
      background: white;
      border-radius: 2px;
      transition: var(--transition);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 70px;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 23, 0.96);
      backdrop-filter: blur(16px);
      flex-direction: column;
      padding: 32px 24px;
      gap: 24px;
      z-index: 99;
      border-bottom: 1px solid rgba(123, 47, 247, 0.4);
    }

    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--text-muted);
    }

    .mobile-menu a:hover {
      color: var(--accent);
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }

    .section-title h2 {
      font-size: 36px;
      font-weight: 700;
      color: white;
      line-height: 1.3;
      margin-bottom: 12px;
    }

    .section-title p {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto;
    }

    /* Hero */
    .hero {
      padding: 80px 0 100px;
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .hero-content {
      flex: 1 1 50%;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 20px;
      color: var(--text-main);
      margin-bottom: 32px;
      opacity: 0.9;
    }

    .hero-badges {
      display: flex;
      gap: 24px;
      margin-top: 32px;
      flex-wrap: wrap;
    }

    .badge-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      background: rgba(20, 26, 38, 0.7);
      backdrop-filter: blur(8px);
      padding: 12px 20px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(123, 47, 247, 0.3);
    }

    .badge-number {
      font-family: var(--font-numbers);
      font-size: 2rem;
      color: var(--accent);
      font-weight: 700;
    }

    .badge-label {
      font-size: 13px;
      color: var(--text-muted);
    }

    .hero-visual {
      flex: 1 1 40%;
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .hero-visual img {
      width: 100%;
      height: auto;
      object-fit: cover;
      border-radius: var(--radius-lg);
    }

    .hero-visual::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(123, 47, 247, 0.2), rgba(0, 229, 255, 0.1));
      pointer-events: none;
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border-top: 3px solid transparent;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-top-color: var(--accent);
    }

    .feature-icon {
      font-size: 2.5rem;
      color: var(--accent);
      margin-bottom: 16px;
    }

    .feature-card h3 {
      font-size: 22px;
      color: white;
      margin-bottom: 10px;
    }

    .feature-stat {
      font-family: var(--font-numbers);
      font-size: 2.2rem;
      color: var(--primary);
      margin-top: 16px;
    }

    /* 功能分组 */
    .roles-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .role-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px 20px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

    .role-card:hover {
      box-shadow: var(--shadow-hover);
    }

    .role-card h4 {
      font-size: 20px;
      color: white;
      margin-bottom: 16px;
    }

    .feature-list {
      list-style: none;
    }

    .feature-list li {
      padding: 6px 0;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-muted);
    }

    .feature-list li::before {
      content: '●';
      color: var(--accent);
      font-size: 12px;
    }

    /* 使用场景 */
    .scene-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .scene-card {
      display: flex;
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

    .scene-card:hover {
      box-shadow: var(--shadow-hover);
    }

    .scene-img {
      width: 45%;
      object-fit: cover;
    }

    .scene-info {
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .scene-info h3 {
      color: white;
      font-size: 22px;
    }

    .tags {
      display: flex;
      gap: 8px;
      margin-top: 12px;
      flex-wrap: wrap;
    }

    .tag {
      background: rgba(0, 229, 255, 0.1);
      color: var(--accent);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
    }

    /* 数据墙 */
    .stats-wall {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
      margin-bottom: 60px;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-numbers);
      font-size: 3rem;
      color: var(--accent);
      font-weight: 700;
    }

    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 24px;
      text-align: center;
      border: 1px solid transparent;
      transition: var(--transition);
    }

    .case-card:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-hover);
    }

    .avatar-placeholder {
      width: 60px;
      height: 60px;
      background: var(--primary);
      border-radius: 50%;
      margin: 0 auto 16px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid rgba(0, 229, 255, 0.2);
      padding: 20px 0;
      cursor: pointer;
    }

    .faq-question {
      font-weight: 600;
      color: white;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
      padding-top: 0;
    }

    .faq-item.active .faq-answer {
      max-height: 150px;
      padding-top: 12px;
    }

    .faq-item.active {
      border-left: 3px solid var(--primary);
      padding-left: 16px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: radial-gradient(circle at center, rgba(123, 47, 247, 0.25), transparent 70%);
      text-align: center;
      padding: 80px 24px;
      border-radius: var(--radius-lg);
    }

    .cta-banner h2 {
      font-size: 36px;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: var(--card-bg);
      padding: 60px 0 30px;
      margin-top: 40px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .footer-logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: white;
    }

    .footer a:hover {
      color: var(--accent);
    }

    .copyright {
      text-align: center;
      margin-top: 40px;
      padding-top: 20px;
      border-top: 1px solid rgba(255,255,255,0.1);
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .roles-grid { grid-template-columns: repeat(2, 1fr); }
      .cases-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero { flex-direction: column; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu.active { display: flex; }
      .features-grid { grid-template-columns: 1fr; }
      .roles-grid { grid-template-columns: 1fr; }
      .scene-grid { grid-template-columns: 1fr; }
      .cases-grid { grid-template-columns: 1fr; }
      .stats-wall { flex-direction: column; align-items: center; }
      .hero h1 { font-size: 36px; }
      .btn { padding: 14px 24px; width: 100%; justify-content: center; }
      .hero-badges { justify-content: center; }
    }