/* roulang page: index */
:root {
      --bg-primary: #0A0E17;
      --bg-secondary: #111827;
      --accent-purple: #A855F7;
      --accent-cyan: #06B6D4;
      --text-primary: #F8FAFC;
      --text-secondary: #94A3B8;
      --success: #10B981;
      --glass-bg: rgba(17, 24, 39, 0.6);
      --glass-border: rgba(168, 85, 247, 0.2);
      --glow-purple: 0 0 15px rgba(168, 85, 247, 0.5);
      --card-radius: 16px;
      --btn-radius: 12px;
      --input-radius: 8px;
      --section-gap: 120px;
      --mobile-gap: 80px;
      --max-width: 1400px;
    }

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

    body {
      font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      background-color: var(--bg-primary);
      color: var(--text-secondary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(10, 14, 23, 0.8);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--glass-border);
      transition: background 0.3s;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-primary);
    }
    .logo i {
      color: var(--accent-purple);
      font-size: 1.8rem;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 8px 0;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-purple);
      box-shadow: 0 0 8px var(--accent-purple);
      transition: width 0.3s;
    }
    .nav-link:hover {
      color: var(--accent-purple);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--accent-purple);
      color: white;
      padding: 10px 24px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      transition: all 0.3s;
      box-shadow: var(--glow-purple);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-primary:hover {
      background: #9333ea;
      box-shadow: 0 0 25px rgba(168, 85, 247, 0.8);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 10px 24px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      transition: all 0.3s;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-outline:hover {
      background: rgba(6, 182, 212, 0.1);
      box-shadow: 0 0 12px rgba(6, 182, 212, 0.4);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--text-primary);
      cursor: pointer;
      background: none;
      border: none;
    }
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: rgba(10, 14, 23, 0.95);
      backdrop-filter: blur(20px);
      position: absolute;
      top: 72px;
      left: 0;
      width: 100%;
      padding: 24px;
      gap: 16px;
      border-bottom: 1px solid var(--glass-border);
    }
    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 500;
    }

    /* Hero */
    .hero {
      padding: 60px 0 80px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 400px;
    }
    .hero-left h1 {
      font-size: 3.5rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      background: linear-gradient(135deg, #A855F7, #06B6D4);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 1.125rem;
      color: var(--text-secondary);
      max-width: 90%;
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-right {
      flex: 1 1 400px;
      position: relative;
      height: 420px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .glass-card-stack {
      position: relative;
      width: 100%;
      height: 100%;
    }
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      padding: 24px;
      position: absolute;
      width: 220px;
      height: 260px;
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 600;
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
    }
    .glass-card i {
      font-size: 2.8rem;
      color: var(--accent-cyan);
      margin-bottom: 16px;
    }
    .card1 {
      top: 20px;
      left: 10%;
      transform: rotate(-5deg);
      background-image: url('/assets/images/backpic/back-1.webp');
      animation: float 4s ease-in-out infinite;
    }
    .card2 {
      top: 80px;
      right: 5%;
      transform: rotate(3deg);
      background-image: url('/assets/images/backpic/back-2.webp');
      animation: float 5s ease-in-out infinite reverse;
    }
    .card3 {
      bottom: 20px;
      left: 20%;
      transform: rotate(-2deg);
      background-image: url('/assets/images/backpic/back-3.webp');
      animation: float 4.5s ease-in-out infinite 1s;
    }
    @keyframes float {
      0% { transform: translateY(0px) rotate(-5deg); }
      50% { transform: translateY(-12px) rotate(-3deg); }
      100% { transform: translateY(0px) rotate(-5deg); }
    }

    /* 板块标题 */
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60px;
      height: 4px;
      background: var(--accent-purple);
      border-radius: 2px;
      box-shadow: 0 0 12px var(--accent-purple);
    }
    .section-header {
      margin-bottom: 48px;
    }

    /* 亮点网格 */
    .highlights {
      padding: var(--section-gap) 0;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      padding: 32px;
      transition: all 0.3s ease;
    }
    .highlight-card:hover {
      transform: translateY(-5px);
      border-color: var(--accent-purple);
      box-shadow: var(--glow-purple);
    }
    .highlight-card i {
      font-size: 2.5rem;
      color: var(--accent-cyan);
      margin-bottom: 16px;
    }
    .highlight-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 8px;
    }

    /* 案例瀑布流 */
    .cases {
      padding: var(--section-gap) 0;
    }
    .masonry {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      grid-auto-rows: 10px;
      gap: 20px;
    }
    .case-card {
      background: #111827;
      border-radius: var(--card-radius);
      overflow: hidden;
      position: relative;
      border: 1px solid #1E293B;
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
    }
    .case-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .case-card:hover img {
      transform: scale(1.05);
    }
    .case-card .case-info {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.8));
      padding: 20px;
      color: white;
      font-weight: 600;
    }
    .span-20 { grid-row-end: span 20; }
    .span-25 { grid-row-end: span 25; }
    .span-22 { grid-row-end: span 22; }

    /* 方案对比 */
    .compare {
      padding: var(--section-gap) 0;
    }
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0;
      background: #111827;
      border-radius: var(--card-radius);
      overflow: hidden;
      border: 1px solid #1E293B;
    }
    .compare-col {
      padding: 32px 24px;
      text-align: center;
      border-right: 1px solid #1E293B;
    }
    .compare-col:last-child { border-right: none; }
    .highlight-col {
      background: linear-gradient(180deg, rgba(168,85,247,0.2) 0%, rgba(10,14,23,0.1) 100%);
      position: relative;
    }
    .badge {
      background: var(--accent-purple);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 12px;
    }
    .compare-col h3 {
      color: white;
      font-size: 1.5rem;
      margin: 12px 0;
    }
    .feature-row {
      padding: 12px 0;
      border-bottom: 1px solid #1E293B;
      color: var(--text-secondary);
    }
    .feature-row i.fa-check { color: var(--success); }
    .feature-row i.fa-minus { color: #4B5563; }

    /* FAQ */
    .faq {
      padding: var(--section-gap) 0;
    }
    .accordion {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: #111827;
      border: 1px solid #1E293B;
      border-radius: 12px;
      margin-bottom: 12px;
      overflow: hidden;
      transition: all 0.3s;
    }
    .faq-item.active {
      border-color: var(--accent-purple);
      box-shadow: 0 0 15px rgba(168, 85, 247, 0.3);
    }
    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--text-primary);
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 1rem;
    }
    .faq-question i {
      color: var(--accent-cyan);
      transition: transform 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 24px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* CTA Banner */
    .cta-banner {
      background: radial-gradient(circle at 30% 30%, rgba(168,85,247,0.15), transparent 70%);
      padding: 80px 24px;
      text-align: center;
      border-radius: 24px;
      margin: 60px 0;
    }
    .cta-banner h2 {
      font-size: 2.5rem;
      color: white;
      margin-bottom: 16px;
    }
    .pulse {
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(168, 85, 247, 0.7); }
      70% { box-shadow: 0 0 0 15px rgba(168, 85, 247, 0); }
      100% { box-shadow: 0 0 0 0 rgba(168, 85, 247, 0); }
    }

    /* Footer */
    .footer {
      background: #0A0E17;
      border-top: 1px solid #1E293B;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }
    .footer-links h4 {
      color: white;
      margin-bottom: 16px;
    }
    .footer-links a {
      display: block;
      color: var(--text-secondary);
      margin-bottom: 8px;
    }
    .footer-links a:hover { color: var(--accent-purple); }
    .copyright {
      text-align: center;
      color: var(--text-secondary);
      padding-top: 20px;
      border-top: 1px solid #1E293B;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .compare-table { grid-template-columns: 1fr; overflow-x: auto; display: flex; }
      .compare-col { min-width: 250px; flex: 1; }
      .hero-left h1 { font-size: 2.8rem; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .mobile-menu.active { display: flex; }
      .hero-grid { flex-direction: column; }
      .hero-right { height: 300px; }
      .glass-card { width: 160px; height: 200px; }
      .grid-3 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 520px) {
      .hero-left h1 { font-size: 2.2rem; }
      .footer-grid { grid-template-columns: 1fr; }
    }