/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --bg-gradient-end: #141832;
      --cyan: #00F0FF;
      --cyan-dark: #0088CC;
      --orange: #FF6B35;
      --white: #FFFFFF;
      --text-secondary: rgba(255,255,255,0.7);
      --text-tertiary: rgba(255,255,255,0.45);
      --border-light: rgba(255,255,255,0.1);
      --glass-bg: rgba(255,255,255,0.04);
      --glass-border: rgba(255,255,255,0.08);
      --card-shadow: 0 8px 32px rgba(0,0,0,0.4);
      --card-hover-shadow: 0 16px 48px rgba(0,240,255,0.2);
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --spacing-section: 100px;
    }

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

    body {
      font-family: var(--font-sans);
      background: var(--deep-blue);
      background: linear-gradient(180deg, #0A0E27 0%, #141832 100%);
      color: var(--white);
      line-height: 1.7;
      font-size: 16px;
      -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 {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s, background 0.2s;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      transition: all 0.25s ease;
      outline: none;
    }

    h1, h2, h3 {
      font-weight: 700;
    }

    h1 {
      font-size: 56px;
      line-height: 1.15;
      letter-spacing: -0.02em;
      font-weight: 800;
    }

    h2 {
      font-size: 40px;
      line-height: 1.25;
    }

    h3 {
      font-size: 22px;
      line-height: 1.35;
      font-weight: 600;
    }

    .section {
      padding: var(--spacing-section) 0;
    }

    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10,14,39,0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0,240,255,0.15);
      transition: background 0.3s;
    }

    #header.scrolled {
      background: rgba(10,14,39,0.95);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 24px;
      color: var(--white);
      letter-spacing: -0.5px;
    }

    .logo-icon {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--cyan), var(--cyan-dark));
      border-radius: 10px;
      color: #0A0E27;
      font-size: 20px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }

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

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--cyan);
    }

    .btn-small {
      padding: 10px 24px;
      height: 44px;
      border-radius: var(--radius-btn);
      background: linear-gradient(135deg, var(--cyan), var(--cyan-dark));
      color: #0A0E27;
      font-weight: 700;
      box-shadow: 0 0 20px rgba(0,240,255,0.4);
      font-size: 15px;
    }

    .btn-small:hover {
      box-shadow: 0 0 35px rgba(0,240,255,0.7);
    }

    .mobile-nav {
      display: none;
    }

    /* 底部移动导航 */
    .bottom-nav {
      display: none;
    }

    /* Hero */
    #hero {
      padding: 160px 0 100px;
      display: flex;
      align-items: center;
      min-height: 100vh;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      align-items: center;
    }

    .hero-left {
      display: flex;
      flex-direction: column;
      gap: 28px;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      margin-top: 8px;
    }

    .btn-primary {
      height: 52px;
      padding: 0 36px;
      border-radius: var(--radius-btn);
      background: linear-gradient(135deg, var(--cyan), var(--cyan-dark));
      color: #0A0E27;
      font-weight: 700;
      box-shadow: 0 0 30px rgba(0,240,255,0.5);
      font-size: 16px;
    }

    .btn-primary:hover {
      box-shadow: 0 0 50px rgba(0,240,255,0.8);
      filter: brightness(1.1);
    }

    .btn-secondary {
      height: 52px;
      padding: 0 36px;
      border-radius: var(--radius-btn);
      background: transparent;
      border: 1.5px solid var(--cyan);
      color: var(--cyan);
      font-weight: 600;
      backdrop-filter: blur(10px);
    }

    .btn-secondary:hover {
      background: rgba(0,240,255,0.1);
    }

    .hero-right {
      position: relative;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .data-card-stack {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 24px;
      color: var(--white);
      transition: all 0.3s;
    }

    .hero-image-bg {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 280px;
      opacity: 0.9;
      position: relative;
      overflow: hidden;
    }

    .particle-overlay {
      position: absolute;
      top:0;left:0;width:100%;height:100%;
      background: radial-gradient(circle at 30% 40%, rgba(0,240,255,0.08) 0%, transparent 50%);
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 32px;
      font-weight: 700;
      color: var(--cyan);
    }

    /* Highlights */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .highlight-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .highlight-card.featured {
      border-left: 4px solid var(--orange);
      transform: scaleY(1.05);
      background: rgba(255,255,255,0.06);
    }

    .highlight-card:hover {
      border-color: rgba(0,240,255,0.4);
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
    }

    .highlight-icon {
      font-size: 32px;
      color: var(--cyan);
    }

    .highlight-title {
      font-size: 24px;
      font-weight: 700;
    }

    /* Cases 瀑布流 */
    .cases-masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .case-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
    }

    .case-card:hover {
      transform: translateY(-6px);
      border-color: rgba(0,240,255,0.4);
      box-shadow: var(--card-hover-shadow);
    }

    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      transition: transform 0.4s;
    }

    .case-card:hover .case-img {
      transform: scale(1.03);
    }

    .case-content {
      padding: 20px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .tag {
      background: rgba(255,107,53,0.15);
      color: var(--orange);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      width: fit-content;
    }

    .case-title {
      font-size: 20px;
      font-weight: 700;
    }

    .view-detail {
      color: var(--cyan);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 6px;
      opacity: 0;
      transition: opacity 0.3s;
    }

    .case-card:hover .view-detail {
      opacity: 1;
    }

    /* Compare */
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .compare-col {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: 16px;
      padding: 32px 24px;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .compare-col.recommended {
      border-color: var(--cyan);
      background: rgba(0,240,255,0.05);
    }

    .badge {
      background: var(--orange);
      color: white;
      padding: 6px 16px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 14px;
    }

    .feature-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .feature-item {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .btn-orange {
      background: linear-gradient(135deg, #FF6B35, #e55a2b);
      color: white;
      box-shadow: 0 0 20px rgba(255,107,53,0.4);
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 40px;
    }

    .faq-item {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: 16px;
      padding: 20px;
      cursor: pointer;
      transition: 0.25s;
    }

    .faq-item.active {
      border-color: var(--cyan);
      background: rgba(0,240,255,0.03);
    }

    .faq-question {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 600;
    }

    .faq-answer {
      margin-top: 12px;
      color: var(--text-secondary);
      display: none;
    }

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

    /* CTA Banner */
    .cta-banner {
      background: #0A0E27;
      text-align: center;
      padding: 100px 0;
    }

    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      padding: 60px 0 40px;
    }

    .footer-links a {
      display: block;
      color: var(--text-secondary);
      margin-bottom: 10px;
    }

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

    .copyright {
      border-top: 1px solid var(--border-light);
      padding: 24px 0;
      text-align: center;
      color: var(--text-tertiary);
    }

    @media (max-width: 1024px) {
      h1 { font-size: 44px; }
      h2 { font-size: 34px; }
      .hero-grid { grid-template-columns: 1fr; }
      .highlights-grid { grid-template-columns: repeat(2,1fr); }
      .cases-masonry { grid-template-columns: repeat(2,1fr); }
      .compare-grid { grid-template-columns: 1fr; overflow-x: auto; display: flex; }
      .compare-col { min-width: 280px; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links, .nav-container .btn-small { display: none; }
      .bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(10,14,39,0.9);
        backdrop-filter: blur(20px);
        border-top: 1px solid var(--cyan);
        justify-content: space-around;
        padding: 12px 16px;
        z-index: 1000;
      }
      .bottom-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        color: var(--text-secondary);
        font-size: 12px;
        gap: 4px;
      }
      .highlights-grid { grid-template-columns: 1fr; }
      .cases-masonry { grid-template-columns: 1fr; }
      .section { padding: 60px 0; }
    }