/* roulang page: index */
:root {
      --primary-purple: #7B2FBE;
      --primary-purple-light: #A855F7;
      --accent-cyan: #00E5FF;
      --bg-deep: #0A0A0F;
      --bg-secondary: #13131A;
      --card-bg: rgba(20, 20, 30, 0.85);
      --white: #F5F5F7;
      --gray: #9CA3AF;
      --radius-lg: 12px;
      --radius-md: 8px;
      --shadow-purple: 0 4px 24px rgba(123, 47, 190, 0.15);
      --shadow-cyan: 0 8px 40px rgba(0, 229, 255, 0.25);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --transition: 0.25s ease-out;
      --container: 1280px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--white);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

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

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

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }

    /* 顶部装饰线 */
    body::before {
      content: '';
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-cyan);
      z-index: 1001;
    }

    /* 导航栏 PC */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 10, 15, 0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid rgba(123, 47, 190, 0.25);
      padding: 12px 0;
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      letter-spacing: 0.5px;
      color: var(--white);
    }

    .logo-icon {
      display: flex;
      align-items: center;
      gap: 3px;
    }

    .logo-icon svg {
      width: 32px;
      height: 32px;
      filter: drop-shadow(0 0 8px rgba(168, 85, 247, 0.6));
    }

    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
      font-weight: 500;
      color: var(--gray);
    }

    .nav-links a {
      color: var(--gray);
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
    }

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

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.2s;
    }

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

    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(18, 18, 26, 0.95);
      backdrop-filter: blur(20px);
      border-top: 1px solid rgba(123, 47, 190, 0.4);
      padding: 10px 16px 16px;
      justify-content: space-around;
      z-index: 999;
    }

    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 11px;
      color: var(--gray);
      gap: 4px;
    }

    .mobile-nav .cta-mobile {
      background: var(--primary-purple);
      color: white;
      border-radius: 40px;
      padding: 6px 18px;
      font-weight: 600;
      margin-top: -20px;
      box-shadow: 0 8px 18px rgba(123, 47, 190, 0.5);
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: radial-gradient(circle at 80% 10%, rgba(123, 47, 190, 0.25), transparent 60%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 4fr;
      gap: 48px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 16px;
      background: linear-gradient(to right, #F5F5F7, #d1b3ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--gray);
      margin-bottom: 32px;
      max-width: 450px;
    }

    .hero-stats {
      display: flex;
      gap: 32px;
      margin-bottom: 32px;
      color: var(--accent-cyan);
      font-weight: 600;
    }

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

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-light));
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 700;
      color: white;
      transition: 0.2s;
      box-shadow: 0 4px 14px rgba(123, 47, 190, 0.4);
      border: 1px solid transparent;
    }

    .btn-primary:hover {
      box-shadow: 0 0 24px var(--accent-cyan);
      border-color: var(--accent-cyan);
      transform: scale(1.03);
    }

    .btn-outline {
      padding: 14px 32px;
      border-radius: var(--radius-md);
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      background: transparent;
    }

    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.1);
    }

    .hero-visual {
      position: relative;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-purple);
    }

    .hero-visual img {
      border-radius: 16px;
    }

    .live-badge {
      position: absolute;
      top: 16px;
      right: 16px;
      background: #ff0044;
      color: white;
      padding: 4px 12px;
      border-radius: 4px;
      font-weight: 700;
      font-size: 13px;
      letter-spacing: 1px;
    }

    .section {
      padding: 90px 0;
    }

    .section h2 {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 40px;
      color: var(--white);
    }

    /* 亮点网格 */
    .highlight-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr 1fr;
      gap: 24px;
    }

    .card-stat {
      background: var(--card-bg);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-lg);
      padding: 28px;
      transition: 0.25s;
      border-top: 3px solid var(--accent-cyan);
    }

    .card-stat:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-cyan);
    }

    /* 案例瀑布 */
    .waterfall {
      columns: 3;
      column-gap: 24px;
    }

    .waterfall-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: rgba(20,20,30,0.8);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: 0.25s;
    }

    .waterfall-item:hover {
      border: 1px solid var(--accent-cyan);
      box-shadow: var(--shadow-cyan);
    }

    /* 方案对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 20px;
    }

    .compare-col {
      padding: 28px;
      border-radius: var(--radius-lg);
      background: #13131A;
    }

    .compare-right {
      background: linear-gradient(145deg, #1a1025, #0f0b1a);
      border: 1px solid var(--primary-purple-light);
    }

    /* FAQ */
    .faq-item {
      background: #13131A;
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
      transition: 0.2s;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 24px 18px;
      color: var(--gray);
      display: none;
      border-left: 3px solid var(--accent-cyan);
      margin-left: 20px;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    /* CTA */
    .full-cta {
      background: linear-gradient(135deg, #7B2FBE, #00E5FF);
      padding: 74px 24px;
      text-align: center;
      border-radius: 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 2fr;
      gap: 28px;
      border-top: 1px solid var(--accent-cyan);
      padding-top: 40px;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .waterfall { columns: 2; }
    }

    @media (max-width: 768px) {
      .navbar { display: none; }
      .mobile-nav { display: flex; }
      .hero { padding-top: 80px; }
      .highlight-grid { grid-template-columns: 1fr; }
      .compare-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      h1 { font-size: 36px; }
    }