/* roulang page: index */
/* 基础重置与设计变量 */
    :root {
      --primary-neon: #00F0A8;
      --primary-hover: #33FFB8;
      --accent-purple: #A855F7;
      --alert-orange: #FF4D4D;
      --bg-deep: #0E0E10;
      --bg-card-dark: #1A1A1E;
      --bg-footer: #0A0A0C;
      --text-white: #FFFFFF;
      --text-light: #F2F2F2;
      --text-muted: #888888;
      --border-light: rgba(255,255,255,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 4px;
      --shadow-card: 0 4px 20px rgba(0,240,168,0.08);
      --transition-smooth: all 0.25s ease;
      --font-mono: 'Roboto Mono', 'DIN', monospace;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-white);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    
    /* 排版 */
    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }
    h1 { font-size: clamp(2.5rem, 6vw, 3rem); }
    h2 { font-size: clamp(2rem, 5vw, 2.25rem); }
    h3 { font-size: 1.5rem; }
    p { color: var(--text-muted); margin-bottom: 1rem; }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: var(--transition-smooth);
      cursor: pointer;
      font-size: 1rem;
      letter-spacing: 0.3px;
      border: 2px solid transparent;
      text-align: center;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--primary-neon);
      color: #0E0E10;
      border-color: var(--primary-neon);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      border-color: var(--primary-hover);
      box-shadow: 0 0 12px rgba(0,240,168,0.6);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary-neon);
      border-color: var(--primary-neon);
    }
    .btn-outline:hover {
      background: rgba(0,240,168,0.08);
      border-color: var(--primary-hover);
      color: var(--primary-hover);
      transform: translateY(-2px);
    }
    
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(14,14,16,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
      transition: background 0.3s;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.6rem;
      font-weight: 700;
      color: white;
    }
    .logo i {
      color: var(--primary-neon);
      font-size: 2rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      color: #ccc;
      position: relative;
      padding: 4px 0;
      font-size: 0.95rem;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: white;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-neon);
      transition: width 0.3s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      margin-left: 16px;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }
    
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        height: 0;
        overflow: hidden;
        background: rgba(10,10,12,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        gap: 28px;
        transition: height 0.4s ease, padding 0.3s;
        padding: 0;
      }
      .nav-links.open {
        height: calc(100vh - 72px);
        padding: 40px 0;
      }
      .menu-toggle {
        display: block;
      }
      .nav-cta {
        margin-left: 0;
      }
    }
    
    /* Hero 区域 */
    .hero-section {
      padding: 140px 0 80px;
      background: radial-gradient(circle at 30% 40%, rgba(168,85,247,0.12) 0%, transparent 50%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .hero-left h1 {
      margin-bottom: 20px;
      color: white;
    }
    .hero-left .subtitle {
      font-size: 1.15rem;
      color: #bbb;
      margin-bottom: 32px;
      line-height: 1.7;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .mock-card {
      background: #15151A;
      border-radius: 16px;
      padding: 24px;
      box-shadow: 0 0 30px rgba(0,240,168,0.15);
      border: 1px solid rgba(0,240,168,0.15);
    }
    .match-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 16px;
    }
    .team {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 600;
    }
    .team span {
      background: #2A2A30;
      width: 32px;
      height: 32px;
      border-radius: 50%;
    }
    .score {
      font-family: var(--font-mono);
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary-neon);
      letter-spacing: 2px;
    }
    .live-badge {
      background: var(--alert-orange);
      color: white;
      font-size: 0.7rem;
      padding: 2px 8px;
      border-radius: 20px;
      margin-left: 8px;
    }
    
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-buttons {
        justify-content: center;
      }
    }
    
    /* 通用section */
    .section {
      padding: 90px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-header h2 {
      color: white;
      margin-bottom: 12px;
    }
    
    /* 特色卡片网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: #141419;
      border-radius: var(--radius-card);
      padding: 28px 22px;
      border: 1px solid transparent;
      transition: all 0.3s ease;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      border-color: rgba(0,240,168,0.3);
      box-shadow: 0 8px 25px rgba(0,240,168,0.1);
    }
    .feature-icon {
      font-size: 2.2rem;
      color: var(--primary-neon);
      margin-bottom: 20px;
    }
    .feature-card h3 {
      margin-bottom: 10px;
    }
    
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 640px) {
      .features-grid { grid-template-columns: 1fr; }
    }
    
    /* 数据案例区 */
    .data-layout {
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 40px;
    }
    .stats-panel {
      background: #121218;
      border-radius: 20px;
      padding: 40px;
    }
    .stat-number {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--primary-neon);
    }
    .case-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .case-item {
      background: #1A1A1E;
      border-radius: 12px;
      padding: 18px;
      display: flex;
      align-items: center;
      gap: 16px;
      border-left: 4px solid var(--accent-purple);
    }
    .case-item:nth-child(2) { border-left-color: var(--primary-neon); }
    .team-dot {
      width: 40px;
      height: 40px;
      background: #2E2E38;
      border-radius: 50%;
    }
    .case-score {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 1.4rem;
    }
    
    @media (max-width: 768px) {
      .data-layout { grid-template-columns: 1fr; }
    }
    
    /* FAQ 手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: #1A1A1E;
      border-radius: 10px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: #1A1A1E;
      border: none;
      width: 100%;
      color: white;
      font-size: 1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #202028;
      padding: 0 24px;
    }
    .faq-answer p {
      padding: 16px 0;
      margin: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    @media (max-width: 640px) {
      .faq-grid { grid-template-columns: 1fr; }
    }
    
    /* CTA与页脚 */
    .cta-block {
      background: #0C0C10;
      text-align: center;
      padding: 70px 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0 40px;
    }
    .footer-links a {
      display: block;
      color: #888;
      margin-bottom: 10px;
    }
    .social-icons i {
      font-size: 1.5rem;
      margin-right: 16px;
      color: #888;
    }
    .copyright {
      border-top: 1px solid #222;
      padding: 20px 0;
      color: #666;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }