/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --bg-deep: #0B0C10;
      --bg-card: rgba(20, 24, 40, 0.6);
      --glass-border: rgba(0, 229, 255, 0.15);
      --primary-cyan: #00E5FF;
      --primary-blue: #007BFF;
      --accent-gold: #FFB800;
      --text-primary: #E0E0E0;
      --text-secondary: #9E9E9E;
      --radius-card: 16px;
      --radius-btn: 50px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-hover: 0 12px 40px rgba(0,229,255,0.2);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-number: 'DIN Alternate', 'PingFang SC', sans-serif;
      --transition-smooth: all 0.3s ease;
    }
    body {
      font-family: var(--font-title);
      background: radial-gradient(circle at 20% 10%, #1A1A2E, #0B0C10 80%);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      min-height: 100vh;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 40px;
      z-index: 1000;
      transition: background 0.3s, backdrop-filter 0.3s;
      background: transparent;
      backdrop-filter: blur(0px);
    }
    .nav-bar.scrolled {
      background: rgba(10, 12, 20, 0.85);
      backdrop-filter: blur(20px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    .logo-area {
      display: flex;
      align-items: baseline;
      gap: 6px;
    }
    .logo-text {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 2px;
      background: linear-gradient(135deg, #00E5FF, #FFB800);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .logo-sub {
      font-size: 0.8rem;
      color: #FFB800;
      margin-left: 4px;
      font-weight: 400;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      color: #E0E0E0;
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: #00E5FF;
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: #00E5FF;
      box-shadow: 0 0 8px #00E5FF;
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: #E0E0E0;
      cursor: pointer;
    }
    .mobile-menu {
      display: none;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .nav-bar {
        padding: 0 20px;
        height: 60px;
      }
      .mobile-menu {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(10, 12, 20, 0.95);
        backdrop-filter: blur(25px);
        align-items: center;
        justify-content: center;
        gap: 32px;
        z-index: 999;
        transform: translateX(100%);
        transition: transform 0.3s ease;
      }
      .mobile-menu.active {
        transform: translateX(0);
      }
      .mobile-menu a {
        font-size: 1.8rem;
        color: #E0E0E0;
        text-decoration: none;
        font-weight: 600;
      }
    }
    /* 按钮 */
    .btn-primary {
      background: linear-gradient(135deg, #00E5FF, #007BFF);
      border: none;
      color: white;
      font-weight: bold;
      padding: 14px 32px;
      border-radius: 50px;
      font-size: 1rem;
      cursor: pointer;
      box-shadow: 0 0 20px rgba(0,229,255,0.4);
      transition: all 0.25s;
      display: inline-block;
      text-decoration: none;
      text-align: center;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 0 30px rgba(0,229,255,0.7);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid #00E5FF;
      color: #00E5FF;
      font-weight: bold;
      padding: 14px 32px;
      border-radius: 50px;
      font-size: 1rem;
      cursor: pointer;
      transition: all 0.25s;
      display: inline-block;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.1);
      border-color: #FFB800;
      color: #FFB800;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-color: rgba(11, 12, 16, 0.7);
    }
    .hero-content {
      text-align: center;
      max-width: 800px;
      padding: 0 20px;
    }
    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: white;
      text-shadow: 0 0 30px rgba(0,229,255,0.5);
    }
    .hero .sub {
      font-size: 1.3rem;
      color: #CCCCCC;
      margin-bottom: 2.2rem;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.2rem;
      }
      .btn-group .btn-primary,
      .btn-group .btn-outline {
        width: 100%;
      }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 20px;
      color: white;
    }
    .section-sub {
      text-align: center;
      color: #9E9E9E;
      max-width: 700px;
      margin: 0 auto 60px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: var(--transition-smooth);
      box-shadow: var(--shadow-card);
    }
    .glass-card:hover {
      transform: translateY(-6px);
      border-color: rgba(0,229,255,0.4);
      box-shadow: var(--shadow-hover);
    }
    .icon-wrap {
      font-size: 2.5rem;
      color: #00E5FF;
      margin-bottom: 20px;
    }
    @media (max-width: 768px) {
      .grid-3 {
        grid-template-columns: 1fr;
      }
      section {
        padding: 70px 0;
      }
      .section-title {
        font-size: 2rem;
      }
    }
    /* 数据条 */
    .stats-bar {
      display: flex;
      justify-content: space-around;
      background: rgba(20, 24, 40, 0.5);
      backdrop-filter: blur(12px);
      border-radius: 24px;
      padding: 32px 20px;
      border: 1px solid rgba(0,229,255,0.2);
      flex-wrap: wrap;
    }
    .stat-item {
      text-align: center;
      flex: 1;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 700;
      color: #FFB800;
    }
    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .step {
      text-align: center;
      flex: 1;
    }
    .step-num {
      font-size: 3rem;
      font-weight: 800;
      color: #00E5FF;
      opacity: 0.8;
    }
    @media (max-width: 768px) {
      .steps {
        flex-direction: column;
        gap: 40px;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: #9E9E9E;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .faq-item.active .faq-question {
      color: #00E5FF;
    }
    footer {
      background: #08090F;
      padding: 50px 0 30px;
      color: #9E9E9E;
    }