/* roulang page: index */
:root {
      --primary-cyan: #00E5FF;
      --deep-green: #0A2E1F;
      --accent-orange: #FF6B35;
      --bg-deep: #0B0C10;
      --bg-card: rgba(20, 25, 30, 0.75);
      --text-soft: #B0B8C1;
      --text-white: #ffffff;
      --border-glow: rgba(0, 229, 255, 0.15);
      --border-strong: rgba(0, 229, 255, 0.5);
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-hover: 0 16px 48px rgba(0, 229, 255, 0.15);
      --radius-card: 16px;
      --radius-pill: 50px;
      --transition: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Inter', 'Roboto', sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-soft);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><filter id="noise"><feTurbulence type="fractalNoise" baseFrequency="0.8" numOctaves="1" stitchTiles="stitch"/></filter><rect width="100" height="100" filter="url(/%23noise)" opacity="0.03"/></svg>');
    }

    a {
      text-decoration: none;
      color: var(--primary-cyan);
      transition: var(--transition);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button, input, textarea {
      font-family: inherit;
    }

    h1, h2, h3, h4, h5 {
      font-weight: 700;
      color: var(--text-white);
      line-height: 1.2;
    }

    .section-padding {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      .section-padding {
        padding: 60px 0;
      }
    }

    /* 自定义导航覆盖Bootstrap */
    .navbar {
      height: 72px;
      background: rgba(11, 12, 16, 0.88) !important;
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.3);
      padding: 0 24px;
      z-index: 1050;
    }

    .navbar-brand {
      font-size: 24px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary-cyan), #0098B4);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 1px;
    }

    .navbar-brand i {
      font-size: 28px;
      color: var(--primary-cyan);
      -webkit-text-fill-color: initial;
      background: none;
    }

    .navbar-nav .nav-link {
      color: #8B939C !important;
      font-size: 16px;
      font-weight: 500;
      padding: 8px 20px !important;
      transition: var(--transition);
      border-radius: 6px;
    }

    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--primary-cyan) !important;
      background: transparent;
      border-bottom: 2px solid var(--primary-cyan);
    }

    .navbar-toggler {
      border: 1px solid var(--primary-cyan);
      box-shadow: none;
    }

    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0, 229, 255, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }

    .offcanvas {
      background: rgba(11, 12, 16, 0.96);
      backdrop-filter: blur(24px);
    }

    .offcanvas .nav-link {
      color: #ddd !important;
      font-size: 18px;
      padding: 14px 24px !important;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    /* 按钮系统 */
    .btn-primary-custom {
      background: linear-gradient(135deg, #00E5FF 0%, #0098B4 100%);
      border: none;
      color: #fff;
      border-radius: var(--radius-pill);
      padding: 14px 36px;
      font-weight: 600;
      box-shadow: 0 0 16px rgba(0,229,255,0.3);
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }

    .btn-primary-custom:hover {
      box-shadow: 0 0 28px rgba(0,229,255,0.7);
      transform: scale(1.03);
      color: #fff;
    }

    .btn-outline-cyan {
      background: transparent;
      border: 2px solid var(--primary-cyan);
      color: var(--primary-cyan);
      border-radius: var(--radius-pill);
      padding: 12px 36px;
      font-weight: 600;
      transition: var(--transition);
    }

    .btn-outline-cyan:hover {
      background: rgba(0, 229, 255, 0.1);
      color: var(--primary-cyan);
      border-color: var(--primary-cyan);
    }

    .btn-orange {
      background: linear-gradient(135deg, #FF6B35 0%, #E04A1F 100%);
      border: none;
      color: white;
      border-radius: var(--radius-pill);
      padding: 14px 40px;
      font-weight: 600;
      box-shadow: 0 0 12px rgba(255,107,53,0.4);
      transition: var(--transition);
    }

    .btn-orange:hover {
      box-shadow: 0 0 28px rgba(255,107,53,0.7);
      transform: scale(1.02);
      color: white;
    }

    /* 卡片系统 */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-glow);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      height: 100%;
    }

    .glass-card:hover {
      border-color: var(--border-strong);
      box-shadow: var(--shadow-hover);
      transform: translateY(-6px);
    }

    .service-icon {
      width: 56px;
      height: 56px;
      background: var(--deep-green);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
      color: var(--primary-cyan);
      margin-bottom: 20px;
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      background: radial-gradient(ellipse at 70% 30%, rgba(0,229,255,0.12) 0%, transparent 60%);
      position: relative;
      display: flex;
      align-items: center;
      overflow: hidden;
    }

    .hero-bg-img {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.3;
      mix-blend-mode: overlay;
    }

    .hero-content {
      position: relative;
      z-index: 2;
    }

    .dashboard-decor {
      position: absolute;
      right: 5%;
      bottom: 15%;
      width: 300px;
      height: 180px;
      background: rgba(20,25,30,0.7);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(0,229,255,0.25);
      border-radius: 24px;
      opacity: 0.8;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-cyan);
      font-size: 14px;
      letter-spacing: 2px;
    }

    /* 数据优势 */
    .stats-section {
      background-color: #0A2E1F;
      background-image: linear-gradient(rgba(0,229,255,0.05) 1px, transparent 1px);
      background-size: 20px 20px;
    }

    .counter {
      font-size: 48px;
      font-weight: 800;
      color: var(--primary-cyan);
      font-feature-settings: "tnum";
      letter-spacing: 0.5px;
    }

    /* FAQ 手风琴 */
    .accordion-custom .accordion-item {
      background: transparent;
      border: none;
      border-bottom: 1px solid rgba(0,229,255,0.15);
    }

    .accordion-custom .accordion-header button {
      background: rgba(20,25,30,0.6);
      color: white;
      font-weight: 600;
      box-shadow: none;
      padding: 18px 24px;
      font-size: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .accordion-custom .accordion-button::after {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%2300E5FF'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
    }

    .accordion-custom .accordion-button:not(.collapsed) {
      background: rgba(0,229,255,0.08);
      color: var(--primary-cyan);
      border-left: 3px solid var(--primary-cyan);
    }

    .form-control-dark {
      background: rgba(20,25,30,0.8);
      border: 1px solid rgba(0,229,255,0.2);
      color: white;
      border-radius: 8px;
      padding: 12px 16px;
    }

    .form-control-dark:focus {
      border-color: var(--primary-cyan);
      box-shadow: 0 0 0 3px rgba(0,229,255,0.25);
      background: rgba(25,30,35,0.9);
    }

    footer {
      background: #080A0D;
      border-top: 1px solid rgba(0,229,255,0.4);
    }