/* roulang page: index */
:root {
      --primary-dark: #0A2E1F;
      --primary-mid: #1B5E3F;
      --primary-light: #2A7A4F;
      --accent-orange: #FF6D2E;
      --accent-glow: rgba(255, 109, 46, 0.35);
      --bg-deep: #0B0F19;
      --bg-card: rgba(255, 255, 255, 0.03);
      --bg-card-hover: rgba(255, 255, 255, 0.06);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255, 255, 255, 0.75);
      --text-muted: rgba(255, 255, 255, 0.45);
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-active: rgba(26, 94, 63, 0.9);
      --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.05);
      --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 109, 46, 0.2);
      --radius-xl: 24px;
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-pill: 40px;
      --transition-smooth: cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --font-mono: 'SF Mono', 'Inter', 'Courier New', monospace;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-deep);
    }

    body {
      font-family: var(--font-sans);
      background: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* 导航 PC 顶部沉浸式 */
    .pc-nav {
      display: flex;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 16px 32px;
      justify-content: space-between;
      align-items: center;
      background: transparent;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
    }

    .pc-nav.scrolled {
      background: rgba(11, 15, 25, 0.8);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 24px rgba(0,0,0,0.5);
    }

    .nav-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: white;
      font-weight: 700;
      font-size: 1.4rem;
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary-dark), var(--primary-mid));
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      font-weight: 800;
      color: white;
      position: relative;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }

    .nav-link {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      padding: 6px 0;
      border-bottom: 2px solid transparent;
    }

    .nav-link:hover {
      color: white;
      border-bottom-color: var(--accent-orange);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-mid), #1f6e4a);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      border: none;
      cursor: pointer;
      font-size: 0.95rem;
      transition: transform 0.2s, box-shadow 0.2s;
      text-decoration: none;
      display: inline-block;
      box-shadow: 0 4px 12px rgba(10,46,31,0.5);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 24px var(--accent-glow);
    }

    .btn-ghost {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      font-size: 0.95rem;
      transition: 0.3s;
      text-decoration: none;
      display: inline-block;
    }

    .btn-ghost:hover {
      background: white;
      color: var(--bg-deep);
    }

    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: max-content;
      background: rgba(20, 25, 35, 0.9);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-pill);
      padding: 8px 24px;
      z-index: 1001;
      box-shadow: 0 8px 30px rgba(0,0,0,0.6);
      gap: 20px;
    }

    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.7rem;
      font-weight: 500;
      transition: 0.2s;
      padding: 4px 8px;
      border-radius: 20px;
    }

    .mobile-nav a.active, .mobile-nav a:hover {
      color: var(--primary-mid);
      background: rgba(26,94,63,0.25);
    }

    @media (min-width: 769px) {
      .pc-nav { display: flex; }
      .mobile-nav { display: none; }
    }

    @media (max-width: 768px) {
      .pc-nav { display: none; }
      .mobile-nav { display: flex; }
    }

    /* Hero */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      background: radial-gradient(circle at 30% 30%, #0f2e22, #0B0F19);
      overflow: hidden;
    }

    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      z-index: 0;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 900px;
    }

    .hero h1 {
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }

    .hero .subtitle {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 40px;
    }

    .hero-actions {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .floating-badges {
      position: absolute;
      bottom: 40px;
      right: 40px;
      display: flex;
      gap: 16px;
      z-index: 3;
      flex-wrap: wrap;
    }

    .badge {
      background: rgba(11,15,25,0.7);
      backdrop-filter: blur(12px);
      padding: 12px 20px;
      border-radius: 40px;
      color: white;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 8px;
      border: 1px solid rgba(255,255,255,0.15);
      animation: pulse 2s infinite;
    }

    @keyframes pulse { 0% { box-shadow: 0 0 0 0 var(--accent-glow); } 70% { box-shadow: 0 0 0 10px transparent; } 100% { box-shadow: 0 0 0 0 transparent; } }

    @media (max-width: 768px) {
      .hero h1 { font-size: 2.2rem; }
      .hero .subtitle { font-size: 1rem; }
      .floating-badges { bottom: 20px; right: 20px; flex-direction: column; }
    }

    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section { padding: 70px 0; }
    }

    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
      background: linear-gradient(to right, #fff, #c0e0d0);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .grid-3, .grid-4 {
      display: grid;
      gap: 24px;
      margin-top: 48px;
    }

    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }

    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: 1fr; }
    }

    .card {
      background: var(--bg-card);
      border-radius: var(--radius-xl);
      padding: 32px;
      border: 1px solid transparent;
      transition: all 0.3s var(--transition-smooth);
      backdrop-filter: blur(8px);
    }

    .card:hover {
      transform: translateY(-8px);
      background: var(--bg-card-hover);
      box-shadow: var(--shadow-hover);
      border-color: rgba(26,94,63,0.5);
    }

    .comparison-table {
      display: flex;
      gap: 32px;
      margin-top: 48px;
    }

    .comp-col {
      flex: 1;
      background: var(--bg-card);
      border-radius: var(--radius-xl);
      padding: 32px;
    }

    .comp-col.highlight {
      background: linear-gradient(145deg, #0f2e22, #0a1f16);
      border: 1px solid var(--primary-mid);
      position: relative;
    }

    .faq-item {
      background: var(--bg-card);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-secondary);
      display: none;
    }

    .faq-item.open .faq-answer { display: block; }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 48px;
      margin-top: 48px;
    }

    @media (max-width: 768px) {
      .contact-grid, .comparison-table { grid-template-columns: 1fr; flex-direction: column; }
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0;
    }

    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }

    input, textarea {
      width: 100%;
      background: #1A1F2B;
      border: 1px solid #2a2f3a;
      border-radius: var(--radius-sm);
      padding: 14px;
      color: white;
      font-size: 1rem;
      transition: 0.2s;
    }

    input:focus, textarea:focus {
      border-color: var(--primary-mid);
      box-shadow: 0 0 0 4px rgba(26,94,63,0.3);
      outline: none;
    }