/* roulang page: index */
:root {
      --primary: #00E5FF;
      --primary-dark: #00B8D4;
      --accent: #FF4D4F;
      --bg-deep: #0A0E27;
      --bg-secondary: #111633;
      --surface: rgba(255,255,255,0.04);
      --text-primary: #FFFFFF;
      --text-body: #B0B8D1;
      --text-muted: #6B7394;
      --border-light: rgba(255,255,255,0.06);
      --border-glow: rgba(0,229,255,0.15);
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-glow-primary: 0 0 20px rgba(0,229,255,0.4);
      --shadow-glow-accent: 0 0 20px rgba(255,77,79,0.4);
      --radius-card: 16px;
      --radius-btn: 8px;
      --sidebar-width: 240px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, textarea {
      font-family: inherit;
    }
    /* 左侧导航栏 */
    .sidebar {
      position: fixed;
      left: 0;
      top: 0;
      height: 100vh;
      width: var(--sidebar-width);
      background: rgba(10,14,39,0.95);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-right: 1px solid transparent;
      background-image: linear-gradient(to bottom, transparent, rgba(0,229,255,0.05), transparent);
      border-image: linear-gradient(to bottom, transparent, rgba(0,229,255,0.25), transparent) 1;
      display: flex;
      flex-direction: column;
      padding: 2rem 1.5rem;
      z-index: 1000;
      transition: transform 0.3s ease;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      margin-bottom: 3rem;
    }
    .logo-icon {
      font-size: 2rem;
      color: var(--primary);
      filter: drop-shadow(0 0 8px rgba(0,229,255,0.6));
    }
    .logo-text {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.02em;
    }
    .nav-menu {
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
      flex: 1;
    }
    .nav-item {
      padding: 0.75rem 1rem;
      border-radius: 8px;
      color: var(--text-body);
      font-weight: 500;
      transition: all 0.25s ease;
      position: relative;
      border-left: 3px solid transparent;
      display: block;
    }
    .nav-item:hover, .nav-item.active {
      color: #FFFFFF;
      background: rgba(0,229,255,0.05);
      border-left-color: var(--primary);
    }
    .sidebar-cta {
      margin-top: auto;
      margin-bottom: 2rem;
    }
    .btn-primary-sm {
      background: linear-gradient(135deg, #00E5FF, #00B8D4);
      color: #0A0E27;
      font-weight: 700;
      padding: 0.75rem 1.5rem;
      border-radius: var(--radius-btn);
      box-shadow: var(--shadow-glow-primary);
      display: block;
      text-align: center;
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
      font-size: 0.95rem;
    }
    .btn-primary-sm:hover {
      box-shadow: 0 0 30px rgba(0,229,255,0.8);
      transform: scale(1.02);
    }
    /* 主内容区 */
    .main-content {
      margin-left: var(--sidebar-width);
      width: calc(100% - var(--sidebar-width));
      min-height: 100vh;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    section {
      padding: 6rem 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 1rem;
      display: flex;
      align-items: center;
      gap: 0.75rem;
      letter-spacing: -0.02em;
    }
    .section-title::before {
      content: '';
      width: 4px;
      height: 28px;
      background: var(--primary);
      border-radius: 2px;
      display: inline-block;
    }
    .section-subtitle {
      color: var(--text-body);
      margin-bottom: 2.5rem;
      font-size: 1.1rem;
    }
    /* 玻璃卡片 */
    .glass-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      padding: 2rem;
    }
    .glass-card:hover {
      border-color: rgba(0,229,255,0.3);
      box-shadow: 0 0 30px rgba(0,229,255,0.15);
      transform: translateY(-4px);
    }
    /* 按钮系统 */
    .btn-primary {
      background: linear-gradient(135deg, #00E5FF, #00B8D4);
      color: #0A0E27;
      font-weight: 700;
      padding: 0.875rem 2.25rem;
      border-radius: var(--radius-btn);
      box-shadow: var(--shadow-glow-primary);
      display: inline-block;
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
      font-size: 1rem;
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0,229,255,0.7);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid rgba(0,229,255,0.4);
      color: var(--primary);
      padding: 0.875rem 2.25rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.3s ease;
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.08);
      border-color: var(--primary);
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      font-weight: 700;
      padding: 0.875rem 2rem;
      border-radius: var(--radius-btn);
      box-shadow: var(--shadow-glow-accent);
      border: none;
      cursor: pointer;
      transition: 0.3s;
      display: inline-block;
    }
    .btn-accent:hover {
      box-shadow: 0 0 30px rgba(255,77,79,0.7);
    }
    /* Hero区域 */
    .hero-bg {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 50%, rgba(0,229,255,0.12) 0%, transparent 70%);
      background-color: rgba(10,14,39,0.7);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      width: 100%;
    }
    .data-badge {
      background: rgba(10,14,39,0.8);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(0,229,255,0.25);
      border-radius: 12px;
      padding: 1rem;
      color: white;
      font-weight: 600;
      box-shadow: 0 0 18px rgba(0,229,255,0.3);
    }
    /* 输入框 */
    .form-input {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 8px;
      color: #FFF;
      padding: 0.75rem 1rem;
      width: 100%;
      transition: 0.2s;
      outline: none;
    }
    .form-input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 10px rgba(0,229,255,0.2);
    }
    .form-input::placeholder {
      color: #6B7394;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .faq-question {
      padding: 1.25rem 0;
      font-weight: 700;
      color: #FFFFFF;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.25rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-icon {
      color: var(--primary);
      transition: 0.3s;
    }
    /* 移动端导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 60px;
      background: rgba(10,14,39,0.95);
      backdrop-filter: blur(20px);
      z-index: 1100;
      align-items: center;
      justify-content: space-between;
      padding: 0 1.5rem;
      border-bottom: 1px solid rgba(0,229,255,0.2);
    }
    .hamburger {
      font-size: 1.5rem;
      color: white;
      cursor: pointer;
    }
    .mobile-menu {
      position: fixed;
      top: 60px;
      left: 0;
      width: 100%;
      height: calc(100vh - 60px);
      background: rgba(10,14,39,0.98);
      backdrop-filter: blur(25px);
      flex-direction: column;
      padding: 2rem;
      display: none;
      z-index: 1050;
      gap: 1rem;
    }
    .mobile-menu.active {
      display: flex;
    }
    @media (max-width: 768px) {
      .sidebar {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        width: 100%;
      }
      .container {
        padding: 0 1.5rem;
      }
      section {
        padding: 4rem 0;
      }
      .section-title {
        font-size: 1.6rem;
      }
      .hero-bg {
        min-height: 80vh;
      }
    }