/* roulang page: index */
/* ----- 设计变量与基础重置 ----- */
    :root {
      --primary-green: #0AE87E;
      --deep-bg: #1A1A2E;
      --accent-red: #E94560;
      --titanium-white: #F0F0F0;
      --text-dark: #4A4A5A;
      --text-muted-on-dark: #B0B0C0;
      --card-bg: rgba(255, 255, 255, 0.05);
      --border-light: rgba(255, 255, 255, 0.1);
      --radius-card: 16px;
      --radius-button: 8px;
      --radius-dock: 40px;
      --shadow-card: 0 10px 30px -10px rgba(0,0,0,0.5);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition: all 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--deep-bg);
      color: #F0F0F0;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .button {
      cursor: pointer;
      font-family: inherit;
      transition: var(--transition);
      border: none;
      outline: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* ----- 浮动Dock导航 ----- */
    .nav-dock {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 32px);
      max-width: 800px;
      background: rgba(26, 26, 46, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-dock);
      padding: 12px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 1000;
      box-shadow: 0 8px 20px rgba(0,0,0,0.6);
      transition: var(--transition);
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: white;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      display: inline-block;
      width: 10px;
      height: 10px;
      background: var(--primary-green);
      clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
      margin-right: 4px;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      color: #ccc;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 6px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary-green);
      border-bottom-color: var(--primary-green);
    }
    .cta-btn-nav {
      background: var(--primary-green);
      color: #0a0a1a;
      font-weight: 700;
      padding: 10px 22px;
      border-radius: 30px;
      font-size: 0.9rem;
      letter-spacing: 0.3px;
      box-shadow: 0 4px 12px rgba(10, 232, 126, 0.4);
    }
    .cta-btn-nav:hover {
      background: #0fffa0;
      box-shadow: 0 6px 18px rgba(10, 232, 126, 0.7);
      transform: translateY(-1px);
    }
    /* 移动端导航调整为底部固定栏 */
    @media (max-width: 768px) {
      .nav-dock {
        top: auto;
        bottom: 16px;
        width: 92%;
        padding: 10px 20px;
        border-radius: 40px;
        background: rgba(26, 26, 46, 0.9);
        backdrop-filter: blur(24px);
      }
      .nav-links a {
        font-size: 0.8rem;
        gap: 16px;
      }
      .nav-links {
        gap: 16px;
      }
      .logo {
        font-size: 1.5rem;
      }
    }
    /* ----- 通用板块样式 ----- */
    section {
      padding: 100px 0;
      position: relative;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }
    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-muted-on-dark);
      max-width: 600px;
      margin-bottom: 56px;
    }
    .dark-bg {
      background-color: var(--deep-bg);
    }
    .light-bg {
      background-color: #f8f9fc;
      color: var(--text-dark);
    }
    .light-bg .section-subtitle {
      color: #5a5a6e;
    }
    /* ----- Hero 首屏 ----- */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #2a2a4a 0%, #0f0f1e 90%);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      filter: brightness(0.6) blur(2px);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-left h1 {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.8px;
      color: #FFFFFF;
      margin-bottom: 24px;
    }
    .hero-left .dynamic-text {
      color: var(--primary-green);
      border-right: 2px solid var(--primary-green);
      padding-right: 6px;
      animation: blink 0.8s infinite;
    }
    @keyframes blink { 50% { border-color: transparent; } }
    .hero-desc {
      font-size: 1.2rem;
      color: #c0c0d0;
      margin-bottom: 36px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-green);
      color: #0a0a1a;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: 30px;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: #0fffa0;
      box-shadow: 0 0 20px rgba(10,232,126,0.6);
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: 30px;
      font-weight: 600;
    }
    .btn-ghost:hover {
      background: white;
      color: #0a0a1a;
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .data-visual {
      background: rgba(20,20,40,0.7);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: 24px;
      padding: 28px;
      width: 100%;
      max-width: 420px;
      box-shadow: var(--shadow-card);
    }
    .score-line {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 2.4rem;
      font-weight: 700;
    }
    .team { color: white; }
    .vs { color: var(--accent-red); font-size: 1.4rem; }
    .live-badge {
      background: var(--accent-red);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      margin-left: 10px;
    }
    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-left h1 {
        font-size: 2.4rem;
      }
      .btn-group {
        justify-content: center;
      }
    }
    /* ----- 功能网格 2x3 不规则 ----- */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 20px;
    }
    .feature-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: all 0.25s ease;
      position: relative;
      overflow: hidden;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      border-color: var(--primary-green);
      box-shadow: 0 15px 25px -10px rgba(10,232,126,0.2);
    }
    .feature-card::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: linear-gradient(90deg, var(--primary-green), #00bfff);
      transform: scaleX(0);
      transition: transform 0.3s ease;
    }
    .feature-card:hover::after {
      transform: scaleX(1);
    }
    .icon-gradient {
      font-size: 2.4rem;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #0AE87E, #00BFFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .feature-card h3 {
      font-size: 1.4rem;
      font-weight: 600;
      margin-bottom: 10px;
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
      section {
        padding: 70px 0;
      }
    }
    /* 场景图文交替 */
    .scene-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .scene-row.reverse {
      flex-direction: row-reverse;
    }
    .scene-img {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(0,0,0,0.6);
    }
    .scene-text {
      flex: 1;
    }
    @media (max-width: 768px) {
      .scene-row, .scene-row.reverse {
        flex-direction: column;
      }
    }
    /* 数据滚动计数 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary-green);
    }
    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.03);
      border-left: 4px solid var(--primary-green);
      margin-bottom: 16px;
      border-radius: 0 12px 12px 0;
      padding: 18px 24px;
      cursor: pointer;
    }
    .faq-q {
      font-weight: 600;
      font-size: 1.1rem;
    }
    .faq-a {
      margin-top: 12px;
      color: #b0b0c0;
      display: none;
    }
    .faq-item.active .faq-a {
      display: block;
    }
    /* CTA */
    .cta-full {
      background: linear-gradient(135deg, #0f0f20, #1a1a2e);
      text-align: center;
      padding: 90px 0;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      padding: 60px 0;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }