/* roulang page: index */
:root {
      --primary: #0A1A2F;
      --accent: #00E5A0;
      --accent-light: #1AFFB8;
      --bg-light: #F5F7FA;
      --text-main: #1A2332;
      --text-secondary: #5A6B7F;
      --text-on-dark: #FFFFFF;
      --text-muted-dark: #B0C4DE;
      --border-light: rgba(10, 26, 47, 0.08);
      --card-bg: rgba(255, 255, 255, 0.85);
      --card-border: rgba(255, 255, 255, 0.4);
      --shadow-card: 0 8px 32px rgba(10, 26, 47, 0.12), 0 2px 8px rgba(10, 26, 47, 0.06);
      --shadow-hover: 0 16px 40px rgba(10, 26, 47, 0.2);
      --glow-accent: 0 0 20px rgba(0, 229, 160, 0.5), 0 4px 16px rgba(0, 229, 160, 0.3);
      --glow-hover: 0 0 32px rgba(0, 229, 160, 0.7);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-img: 24px;
      --font-zh: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --bs-gutter-x: 24px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-zh);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      margin: 0;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, .h1, .h2, .h3, .h4 {
      font-weight: 700;
      letter-spacing: -0.2px;
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
    }
    h2 {
      font-size: 36px;
      line-height: 1.3;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
    }
    h4 {
      font-size: 18px;
      font-weight: 600;
    }
    .text-large {
      font-size: 16px;
      line-height: 1.7;
    }
    .text-small {
      font-size: 14px;
      line-height: 1.6;
    }
    .accent-text {
      color: var(--accent);
    }
    .text-secondary {
      color: var(--text-secondary);
    }

    /* 容器调整 */
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    section {
      padding: 100px 0;
      position: relative;
    }

    /* 按钮系统 */
    .btn-primary-custom {
      background: var(--accent);
      color: var(--primary);
      font-weight: 700;
      border: none;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      box-shadow: var(--glow-accent);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.3px;
    }
    .btn-primary-custom:hover {
      background: var(--accent-light);
      box-shadow: var(--glow-hover);
      color: var(--primary);
      transform: translateY(-1px);
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      transition: 0.3s;
    }
    .btn-outline-custom:hover {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }
    .btn-light-custom {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.3);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      transition: 0.3s;
    }
    .btn-light-custom:hover {
      background: rgba(255,255,255,0.25);
      color: white;
    }

    /* 导航 */
    .navbar {
      transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s;
      z-index: 1030;
      padding: 12px 0;
    }
    .navbar-scrolled {
      background: rgba(10, 26, 47, 0.9);
      backdrop-filter: blur(16px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }
    .navbar-brand {
      font-size: 24px;
      font-weight: 700;
      color: white !important;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .navbar-dark .navbar-nav .nav-link {
      color: rgba(255,255,255,0.85);
      font-size: 15px;
      font-weight: 500;
      margin: 0 16px;
      transition: 0.2s;
      position: relative;
    }
    .navbar-dark .navbar-nav .nav-link:hover,
    .navbar-dark .navbar-nav .nav-link.active {
      color: var(--accent);
    }
    .navbar-dark .navbar-nav .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent);
    }
    .nav-cta-btn {
      background: var(--accent);
      color: var(--primary) !important;
      border-radius: 30px;
      padding: 8px 22px !important;
      font-weight: 700;
      margin-left: 8px;
      box-shadow: 0 0 12px rgba(0,229,160,0.4);
    }
    .navbar-toggler {
      border: none;
      color: white;
    }
    .offcanvas {
      background: rgba(10,26,47,0.95);
      backdrop-filter: blur(20px);
    }
    .offcanvas .nav-link {
      color: white;
      font-size: 18px;
      margin: 12px 0;
    }

    /* Hero */
    .hero-section {
      background: linear-gradient(180deg, #F5F7FA 0%, rgba(10,26,47,0.03) 100%);
      padding-top: 140px;
      padding-bottom: 80px;
      position: relative;
      overflow: hidden;
    }
    .hero-badge {
      background: rgba(0,229,160,0.15);
      color: var(--accent);
      border-radius: 30px;
      padding: 6px 20px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 20px;
    }
    .hero-image-wrap {
      border-radius: var(--radius-img);
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(10,26,47,0.2);
      border: 1px solid rgba(255,255,255,0.5);
      animation: float 4s ease-in-out infinite;
    }
    @keyframes float {
      0%,100% { transform: translateY(0); }
      50% { transform: translateY(-6px); }
    }

    /* 玻璃卡片 */
    .glass-card {
      background: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(240,248,255,0.8) 100%);
      backdrop-filter: blur(20px) saturate(180%);
      border: 1px solid var(--card-border);
      box-shadow: var(--shadow-card);
      border-radius: var(--radius-card);
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s;
    }
    .glass-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0,229,160,0.5);
    }

    /* 优势区 */
    .advantage-icon {
      width: 64px;
      height: 64px;
      background: rgba(0,229,160,0.1);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 32px;
      margin-bottom: 20px;
    }

    /* 功能交错 */
    .feature-img {
      border-radius: 20px;
      box-shadow: 0 10px 30px rgba(0,0,0,0.1);
      border: 1px solid rgba(0,229,160,0.25);
    }

    /* 场景卡片 */
    .scene-card {
      border-radius: 20px;
      overflow: hidden;
      background: white;
      box-shadow: 0 8px 20px rgba(0,0,0,0.04);
      transition: 0.3s;
    }
    .scene-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 20px 30px rgba(10,26,47,0.12);
    }
    .scene-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      position: relative;
    }

    /* 数据案例 */
    .data-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--accent);
      line-height: 1.1;
    }

    /* 价格高亮 */
    .pricing-highlight {
      transform: scale(1.05);
      border: 2px solid var(--accent);
      box-shadow: 0 0 24px rgba(0,229,160,0.4);
      position: relative;
      z-index: 2;
      background: white;
    }
    .popular-badge {
      background: var(--accent);
      color: var(--primary);
      font-weight: 700;
      padding: 5px 18px;
      border-radius: 20px;
      font-size: 13px;
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      background: white;
      border-radius: 12px !important;
      box-shadow: none;
      border: 1px solid rgba(10,26,47,0.06);
      padding: 20px;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(0,229,160,0.03);
      border-color: var(--accent);
      color: var(--primary);
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--accent);
    }

    /* 终局CTA */
    .cta-final {
      background: var(--primary);
      position: relative;
      overflow: hidden;
    }
    .particle-bg {
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      background: radial-gradient(circle at 30% 40%, rgba(0,229,160,0.08) 0%, transparent 50%);
      pointer-events: none;
    }

    footer a {
      color: #B0C4DE;
      text-decoration: none;
      transition: 0.2s;
    }
    footer a:hover {
      color: var(--accent);
      text-decoration: underline;
    }

    @media (max-width: 992px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .navbar .nav-link { margin: 8px 0; }
      .hero-section { padding-top: 120px; }
      .pricing-highlight { transform: scale(1); }
    }
    @media (max-width: 768px) {
      section { padding: 70px 0; }
      .btn-primary-custom, .btn-outline-custom { width: 100%; margin-bottom: 10px; }
    }