/* roulang page: index */
:root {
      --ink-black: #1A1D23;
      --pure-black: #0B0D11;
      --purple-electric: #7C3AED;
      --orange-energy: #FF6B35;
      --glacier-white: #F0F4F8;
      --track-gray: #2D3139;
      --neon-cyan: #00F5D4;
      --card-bg: rgba(45, 49, 57, 0.6);
      --border-light: rgba(255, 255, 255, 0.08);
      --shadow-deep: 0 12px 40px rgba(0, 0, 0, 0.6);
      --glow-purple: 0 0 20px rgba(124, 58, 237, 0.6);
      --radius-xl: 28px;
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-full: 50px;
      --font-inter: 'Inter', system-ui, -apple-system, sans-serif;
      --font-chinese: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      background-color: var(--ink-black);
    }

    body {
      font-family: var(--font-chinese);
      background-color: var(--ink-black);
      color: var(--glacier-white);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    h1, h2, h3, .inter-font {
      font-family: var(--font-inter);
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: opacity 0.2s;
    }

    button, .btn {
      cursor: pointer;
      border: none;
      background: none;
      font-family: inherit;
      font-size: inherit;
      transition: all 0.25s ease;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26, 29, 35, 0.82);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      padding: 16px 0;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 22px;
      color: var(--glacier-white);
      letter-spacing: 1px;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: radial-gradient(circle at 30% 30%, var(--purple-electric), #1e1330);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      color: white;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 15px;
      color: rgba(240, 244, 248, 0.8);
      position: relative;
    }

    .nav-links a:hover {
      color: var(--glacier-white);
    }

    .nav-cta {
      background: linear-gradient(135deg, var(--purple-electric), var(--orange-energy));
      padding: 12px 28px;
      border-radius: 40px;
      font-weight: 600;
      color: white !important;
      box-shadow: 0 6px 18px rgba(124, 58, 237, 0.35);
      transition: transform 0.15s, box-shadow 0.2s;
      margin-left: 12px;
    }

    .nav-cta:hover {
      transform: scale(1.04);
      box-shadow: 0 0 28px rgba(124, 58, 237, 0.7);
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 10px;
      right: 10px;
      background: rgba(26, 29, 35, 0.92);
      backdrop-filter: blur(30px);
      border-radius: 40px;
      padding: 10px 24px;
      z-index: 1001;
      box-shadow: 0 10px 35px rgba(0,0,0,0.7);
      border: 1px solid rgba(255,255,255,0.1);
    }

    .mobile-nav-inner {
      display: flex;
      justify-content: space-around;
      align-items: center;
    }

    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: rgba(240,244,248,0.7);
      font-size: 12px;
      transition: 0.2s;
    }
    .mobile-nav-item i { font-size: 20px; margin-bottom: 2px; }
    .mobile-nav-item.active { color: var(--neon-cyan); }

    .paw-icon {
      background: var(--purple-electric);
      width: 44px;
      height: 44px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 0 25px #7C3AED;
      font-size: 22px;
    }

    @media (max-width: 768px) {
      .navbar { display: none; }
      .mobile-bottom-nav { display: block; }
      .container { padding: 0 20px; }
    }

    /* Hero */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 30% 30%, #1e1733, #0a0c10);
    }

    .particles {
      position: absolute;
      width: 100%;
      height: 100%;
      top:0; left:0;
      pointer-events: none;
    }

    .hero-content {
      text-align: center;
      z-index: 5;
      max-width: 900px;
      padding: 0 20px;
    }

    .hero h1 {
      font-size: clamp(36px, 8vw, 60px);
      font-weight: 800;
      letter-spacing: -1px;
      margin-bottom: 24px;
      background: linear-gradient(to right, #fff, #d1c4f0);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-sub {
      font-size: 20px;
      color: rgba(240,244,248,0.75);
      margin-bottom: 48px;
    }

    .btn-group {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--purple-electric), var(--orange-energy));
      padding: 16px 44px;
      border-radius: 50px;
      font-weight: 700;
      color: white;
      box-shadow: 0 8px 28px rgba(124,58,237,0.45);
    }
    .btn-primary:hover { box-shadow: var(--glow-purple); transform: translateY(-2px); }

    .btn-outline {
      border: 1px solid rgba(255,255,255,0.5);
      padding: 16px 44px;
      border-radius: 50px;
      color: white;
      font-weight: 600;
      backdrop-filter: blur(8px);
    }
    .btn-outline:hover { background: rgba(124,58,237,0.2); border-color: var(--purple-electric); }

    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 34px;
      font-weight: 700;
      margin-bottom: 20px;
      text-align: center;
    }

    /* 交错图文 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
      flex-wrap: wrap;
    }
    .feature-text { flex: 1; }
    .feature-img { flex: 1; border-radius: 24px; overflow: hidden; }

    /* 不规则栅格 */
    .grid-masonry {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .card-big { grid-column: span 2; grid-row: span 2; }
    .card-glass {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 20px;
      padding: 28px;
      transition: all 0.3s;
    }
    .card-glass:hover { transform: translateY(-8px); border-color: var(--purple-electric); box-shadow: 0 0 30px rgba(124,58,237,0.3); }

    .counter-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      background: rgba(45,49,57,0.4);
      border-radius: 30px;
      padding: 40px;
      margin: 40px 0;
      flex-wrap: wrap;
    }

    .faq-wrapper {
      display: flex;
      gap: 40px;
    }
    .faq-categories { display: flex; flex-direction: column; gap: 12px; }
    .faq-cat { padding: 12px 20px; border-radius: 30px; background: transparent; color: #ccc; cursor: pointer; }
    .faq-cat.active { background: var(--purple-electric); color: white; }

    footer {
      background: #0B0D11;
      padding: 70px 0 30px;
    }

    @media (max-width: 1024px) {
      .grid-masonry { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .grid-masonry { grid-template-columns: 1fr; }
      .faq-wrapper { flex-direction: column; }
      .faq-categories { flex-direction: row; flex-wrap: wrap; }
    }