/* roulang page: index */
:root {
      --deep-space: #0A0E27;
      --cyan-electro: #00F0FF;
      --magenta-spike: #FF2A5F;
      --functional-green: #00B578;
      --alert-orange: #FF9F0A;
      
      --light-bg: #F5F6FA;
      --white-card: #FFFFFF;
      --dark-text: #1F2329;
      --mid-text: #86909C;
      --light-text: #E8EAED;
      --soft-text: #9AA0A6;
      
      --glass-bg: rgba(255, 255, 255, 0.08);
      --glass-border: rgba(255, 255, 255, 0.1);
      --card-shadow: 0 4px 12px rgba(0,0,0,0.04);
      --hover-shadow: 0 12px 24px rgba(0,0,0,0.08);
      --cyan-glow: 0 0 18px rgba(0,240,255,0.5);
      
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-xl: 24px;
      
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--light-bg);
      color: var(--dark-text);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 沉浸式导航 */
    header.nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--cyan-electro);
      letter-spacing: 1px;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      font-size: 26px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--light-text);
      text-decoration: none;
      font-weight: 500;
      font-size: 16px;
      position: relative;
      transition: color 0.2s;
      padding: 8px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--cyan-electro);
      transition: width 0.3s ease;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--cyan-electro);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: var(--light-text);
      font-size: 26px;
      cursor: pointer;
    }
    
    /* 区块通用 */
    section {
      padding: 100px 0;
      position: relative;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--dark-text);
      margin-bottom: 16px;
    }
    .section-sub {
      font-size: 18px;
      color: var(--mid-text);
      margin-bottom: 48px;
    }
    .dark-section .section-title,
    .dark-section .section-sub {
      color: var(--light-text);
    }
    .dark-section .section-sub {
      color: var(--soft-text);
    }
    
    /* 按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      text-decoration: none;
      transition: all 0.25s ease;
      border: 1.5px solid transparent;
      cursor: pointer;
      gap: 8px;
    }
    .btn-primary {
      background: var(--cyan-electro);
      color: var(--deep-space);
      border-color: var(--cyan-electro);
    }
    .btn-primary:hover {
      background: #33f5ff;
      box-shadow: var(--cyan-glow);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      color: var(--cyan-electro);
      border-color: var(--cyan-electro);
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
    }
    
    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A0E27 0%, #131a3a 100%);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }
    .hero-bg-img {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.35;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }
    .hero-content h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--cyan-electro);
      margin-bottom: 24px;
    }
    .hero-content .sub {
      font-size: 20px;
      color: var(--soft-text);
      margin-bottom: 40px;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 28px 24px;
      color: var(--light-text);
      transition: transform 0.2s;
    }
    .stat-card:hover {
      transform: translateY(-6px);
    }
    .stat-number {
      font-size: 40px;
      font-weight: 700;
      color: var(--cyan-electro);
      font-feature-settings: "tnum";
      margin-bottom: 8px;
    }
    .stat-label {
      font-size: 16px;
      color: var(--soft-text);
    }
    .stat-growth {
      color: var(--functional-green);
      font-weight: 600;
      margin-left: 8px;
      font-size: 18px;
    }
    
    /* 服务矩阵 - 非等高三列 */
    .service-matrix {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--white-card);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--card-shadow);
      transition: all 0.25s;
      display: flex;
      flex-direction: column;
      height: fit-content;
    }
    .service-card:hover {
      box-shadow: var(--hover-shadow);
      transform: translateY(-4px);
    }
    .service-icon {
      background: rgba(0,240,255,0.1);
      width: 56px;
      height: 56px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-md);
      color: var(--cyan-electro);
      font-size: 26px;
      margin-bottom: 24px;
    }
    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--mid-text);
      font-size: 16px;
    }
    
    /* 对比区块 */
    .comparison-wrapper {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 20px;
      align-items: center;
    }
    .compare-col {
      background: #f0f2f5;
      border-radius: var(--radius-lg);
      padding: 32px;
    }
    .compare-col.starry {
      background: #ffffff;
      border: 1px solid rgba(0,240,255,0.25);
      box-shadow: 0 0 20px rgba(0,240,255,0.1);
    }
    .compare-col h4 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 20px;
      color: var(--mid-text);
    }
    .compare-col.starry h4 {
      color: var(--cyan-electro);
    }
    .compare-list {
      list-style: none;
    }
    .compare-list li {
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--dark-text);
    }
    .vs-badge {
      font-weight: 800;
      font-size: 24px;
      color: var(--magenta-spike);
      background: rgba(255,42,95,0.1);
      padding: 12px 16px;
      border-radius: 50%;
    }
    
    /* FAQ */
    .faq-item {
      background: var(--white-card);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      box-shadow: var(--card-shadow);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: #fff;
      transition: color 0.2s;
    }
    .faq-question.active {
      color: var(--cyan-electro);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 24px;
      color: var(--mid-text);
    }
    .faq-answer.open {
      max-height: 200px;
      padding-bottom: 20px;
    }
    
    /* 表单 */
    .contact-form {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
    }
    .form-group.full {
      grid-column: span 2;
    }
    input, select {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: var(--radius-sm);
      padding: 14px 16px;
      color: white;
      font-size: 16px;
      outline: none;
      transition: 0.2s;
    }
    input:focus, select:focus {
      border-color: var(--cyan-electro);
      box-shadow: 0 0 10px rgba(0,240,255,0.4);
    }
    
    /* 页脚 */
    footer {
      background: var(--deep-space);
      color: var(--soft-text);
      padding: 40px 0;
      text-align: center;
    }
    .social i {
      font-size: 24px;
      margin: 0 12px;
      color: var(--soft-text);
      transition: 0.2s;
    }
    .social i:hover {
      color: var(--cyan-electro);
    }
    
    @media (max-width: 1024px) {
      .dashboard-grid { grid-template-columns: repeat(2,1fr); }
      .service-matrix { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(10,14,39,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
      }
      .mobile-menu.open { display: flex; }
      .dashboard-grid { grid-template-columns: 1fr; }
      .service-matrix { grid-template-columns: 1fr; }
      .comparison-wrapper { grid-template-columns: 1fr; }
      .vs-badge { margin: 16px auto; }
      .contact-form { grid-template-columns: 1fr; }
      .form-group.full { grid-column: span 1; }
      h1 { font-size: 36px !important; }
      .section-title { font-size: 28px; }
    }