/* roulang page: index */
/* 基础重置与设计变量 */
    :root {
      --primary: #6C3CFF;
      --primary-glow: rgba(108, 60, 255, 0.5);
      --accent: #FF6B35;
      --accent-glow: rgba(255, 107, 53, 0.6);
      --bg-deep: #0A0A14;
      --bg-section: #0F0F1E;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(108, 60, 255, 0.15);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255, 255, 255, 0.7);
      --text-muted: rgba(255, 255, 255, 0.45);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 4px 30px rgba(108, 60, 255, 0.08);
      --shadow-hover: 0 8px 40px rgba(108, 60, 255, 0.25);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1280px;
      --header-height: 72px;
      transition: all 0.2s ease;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-deep);
    }

    body {
      font-family: var(--font-sans);
      background: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      padding-top: var(--header-height);
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s, background 0.2s, border 0.2s;
    }

    button, input, textarea {
      font-family: inherit;
    }

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

    /* 导航栏 - 沉浸式半透明 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 10, 20, 0.75);
      backdrop-filter: blur(15px);
      -webkit-backdrop-filter: blur(15px);
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(rgba(10,10,20,0.75), rgba(10,10,20,0.75)), linear-gradient(90deg, var(--primary), var(--accent));
      background-origin: border-box;
      background-clip: padding-box, border-box;
      border-bottom: 1px solid transparent;
    }

    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: var(--header-height);
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 0.5px;
      color: white;
    }
    .logo-icon {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 34px;
      height: 34px;
      background: linear-gradient(135deg, var(--primary), #8A5CFF);
      border-radius: 8px;
      font-size: 1.3rem;
    }
    .logo-text {
      background: linear-gradient(to right, #fff, #e0e0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: linear-gradient(135deg, #6C3CFF, #8A5CFF);
      border: none;
      color: white;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 8px;
      font-size: 0.9rem;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s;
      box-shadow: 0 4px 12px rgba(108, 60, 255, 0.3);
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 25px rgba(108, 60, 255, 0.6);
      transform: translateY(-2px);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(108, 60, 255, 0.5);
      color: white;
      padding: 10px 22px;
      border-radius: 8px;
      font-weight: 500;
      cursor: pointer;
      transition: 0.25s;
    }
    .btn-ghost:hover {
      background: rgba(108, 60, 255, 0.1);
      border-color: var(--primary);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: 0.2s;
    }

    /* 移动端导航面板 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--header-height);
      left: 0;
      width: 100%;
      background: rgba(10, 10, 20, 0.95);
      backdrop-filter: blur(20px);
      padding: 32px 24px;
      flex-direction: column;
      gap: 24px;
      z-index: 999;
      border-bottom: 1px solid var(--glass-border);
    }
    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 500;
      color: white;
    }

    /* 板块通用标题 */
    .section-title {
      font-weight: 600;
      font-size: clamp(28px, 4vw, 48px);
      margin-bottom: 16px;
      color: white;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 3px;
      background: linear-gradient(90deg, var(--primary), var(--accent));
      margin-top: 8px;
      border-radius: 2px;
    }
    .section-subtitle {
      color: var(--text-secondary);
      font-size: 1.1rem;
      max-width: 700px;
      margin-bottom: 48px;
    }

    /* Hero 双栏 */
    .hero {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      padding: 50px 0 70px;
      min-height: 80vh;
    }
    .hero-left h1 {
      font-weight: 700;
      font-size: clamp(36px, 5vw, 64px);
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 24px;
      background: linear-gradient(to right, #fff, #c0b0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-right {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100%;
    }
    .glass-stack {
      position: relative;
      width: 100%;
      max-width: 400px;
      aspect-ratio: 4/5;
    }
    .glass-card {
      position: absolute;
      width: 100%;
      height: 100%;
      background: rgba(255, 255, 255, 0.03);
      backdrop-filter: blur(20px);
      border-radius: 24px;
      border: 1px solid rgba(108, 60, 255, 0.2);
      box-shadow: var(--shadow-card);
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }
    .glass-card:nth-child(1) {
      transform: rotate(-5deg) translateX(-10px);
      z-index: 3;
    }
    .glass-card:nth-child(2) {
      transform: rotate(3deg) translateY(10px) scale(0.95);
      z-index: 2;
      opacity: 0.8;
    }
    .glass-card:nth-child(3) {
      transform: rotate(-3deg) translateX(20px) scale(0.9);
      z-index: 1;
      opacity: 0.6;
    }

    /* 板块间距 */
    section {
      padding: 80px 0;
    }
    .bg-alternate {
      background: var(--bg-section);
    }

    /* 亮点网格 不规则六宫格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      grid-auto-rows: minmax(200px, auto);
      gap: 24px;
    }
    .feature-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-card);
    }
    .feature-card:hover {
      background: rgba(108, 60, 255, 0.05);
      border-color: var(--primary);
      box-shadow: 0 12px 30px rgba(108, 60, 255, 0.2);
    }
    .feature-card.large {
      grid-row: span 2;
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--accent);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      font-size: 1.3rem;
      font-weight: 600;
      margin-bottom: 10px;
      color: white;
    }
    .feature-card p {
      color: var(--text-secondary);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    /* 服务瀑布流 */
    .services-waterfall {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .service-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
    }
    .service-img {
      height: 160px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .service-content {
      padding: 20px;
      flex:1;
    }
    .service-content h3 {
      font-weight: 600;
      font-size: 1.2rem;
      margin-bottom: 8px;
    }
    .service-link {
      color: var(--accent);
      font-size: 0.9rem;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-top: 12px;
      transition: gap 0.2s;
    }
    .service-link:hover {
      gap: 10px;
    }

    /* 方案对比表 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: start;
    }
    .compare-col {
      background: rgba(255,255,255,0.02);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-md);
      padding: 32px;
      border: 1px solid transparent;
    }
    .compare-col.left {
      border-color: rgba(180, 50, 50, 0.2);
      background: rgba(80, 20, 20, 0.08);
    }
    .compare-col.right {
      border-color: var(--primary);
      background: rgba(108, 60, 255, 0.05);
      box-shadow: 0 0 20px rgba(108, 60, 255, 0.15);
    }
    .compare-item {
      display: flex;
      gap: 12px;
      margin: 16px 0;
    }

    /* 统计数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
      text-shadow: 0 0 12px var(--primary-glow);
      font-variant-numeric: tabular-nums;
    }

    /* FAQ 手风琴 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 20px 24px;
      font-size: 1.1rem;
      font-weight: 500;
      color: white;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-secondary);
      display: none;
      border-top: 1px solid rgba(108,60,255,0.2);
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA 表单 */
    .contact-form {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      max-width: 700px;
      margin: 30px auto 0;
    }
    .contact-form input {
      flex: 1 1 200px;
      padding: 14px;
      background: rgba(20,20,30,0.8);
      border: 1px solid rgba(108,60,255,0.3);
      border-radius: 8px;
      color: white;
    }
    .btn-pulse {
      background: linear-gradient(135deg, #6C3CFF, #FF6B35);
      border: none;
      color: white;
      padding: 14px 32px;
      border-radius: 8px;
      font-weight: bold;
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(108,60,255,0.7); }
      70% { box-shadow: 0 0 20px 10px rgba(255,107,53,0.4); }
      100% { box-shadow: 0 0 0 0 rgba(108,60,255,0); }
    }

    .footer {
      background: #05050A;
      padding: 40px 0;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .hero { grid-template-columns: 1fr; text-align: center; }
      .hero-right { order: -1; max-width: 300px; margin: 0 auto; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .services-waterfall { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu.active { display: flex; }
      .features-grid { grid-template-columns: 1fr; }
      .services-waterfall { grid-template-columns: 1fr; }
      .compare-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
    }