/* roulang page: index */
:root {
      --primary: #E94057;
      --primary-glow: rgba(233, 64, 87, 0.45);
      --accent: #00D2FF;
      --accent-glow: rgba(0, 210, 255, 0.25);
      --gold: #FFB800;
      --bg-deep: #0A0E17;
      --bg-card: #111827;
      --bg-elevated: #1A1F2E;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B8C1;
      --text-muted: #6B7280;
      --radius-card: 14px;
      --radius-btn: 10px;
      --shadow-neon: 0 0 18px rgba(0, 210, 255, 0.08);
      --shadow-neon-hover: 0 0 28px rgba(0, 210, 255, 0.25);
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition-smooth: 0.2s cubic-bezier(0.23, 1, 0.32, 1);
    }
    * {
      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-secondary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 23, 0.88);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(0, 210, 255, 0.18);
      z-index: 999;
      padding: 0 32px;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 0.5px;
      color: #fff;
    }
    .logo span {
      background: linear-gradient(135deg, var(--primary), #ff6b81);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding-bottom: 6px;
      transition: color var(--transition-smooth);
    }
    .nav-links a:hover,
    .nav-links a:focus-visible {
      color: #fff;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition-smooth);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: background 0.2s, box-shadow 0.2s;
      margin-left: 16px;
    }
    .btn-nav:hover {
      background: #ff4f6b;
      box-shadow: 0 0 16px var(--primary-glow);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--text-primary);
      border-radius: 4px;
      transition: 0.2s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 23, 0.96);
      backdrop-filter: blur(20px);
      flex-direction: column;
      padding: 28px 32px;
      gap: 24px;
      border-bottom: 1px solid rgba(0,210,255,0.2);
    }
    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 500;
      color: var(--text-secondary);
    }
    .mobile-menu .btn-nav {
      display: inline-block;
      width: fit-content;
      margin: 8px 0 0;
    }
    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center 30%;
      background-repeat: no-repeat;
      margin-top: 72px;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 30%, rgba(10,14,23,0.4) 0%, #0A0E17 95%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 720px;
    }
    .hero h1 {
      font-size: clamp(2.6rem, 6vw, 3.8rem);
      font-weight: 700;
      line-height: 1.2;
      color: #fff;
      margin-bottom: 24px;
    }
    .hero h1 .gradient-text {
      background: linear-gradient(to right, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero p {
      font-size: 1.2rem;
      margin-bottom: 36px;
      color: var(--text-secondary);
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      transition: 0.2s;
      box-shadow: 0 6px 18px rgba(233,64,87,0.3);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: #ff4f6b;
      box-shadow: 0 0 22px var(--primary-glow);
    }
    .btn-outline {
      border: 1.5px solid var(--accent);
      color: var(--accent);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(0,210,255,0.08);
      box-shadow: 0 0 16px rgba(0,210,255,0.25);
    }
    /* 通用区块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.3rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-muted);
      text-align: center;
      max-width: 620px;
      margin: 0 auto 48px;
    }
    /* 价值主张 */
    .value-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr 1fr;
      gap: 32px;
      margin-top: 20px;
    }
    .value-card {
      background: var(--bg-card);
      padding: 36px 28px;
      border-radius: var(--radius-card);
      border-left: 4px solid var(--accent);
      box-shadow: var(--shadow-neon);
      transition: all var(--transition-smooth);
    }
    .value-card:hover {
      transform: translateY(-5px);
      border-left-color: var(--primary);
      box-shadow: var(--shadow-neon-hover);
    }
    .value-icon {
      font-size: 2.4rem;
      color: var(--accent);
      margin-bottom: 20px;
    }
    /* 功能卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: rgba(17,24,39,0.8);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(0,210,255,0.12);
      border-radius: var(--radius-card);
      padding: 30px 24px;
      position: relative;
      transition: 0.25s;
      box-shadow: 0 4px 14px rgba(0,0,0,0.4);
    }
    .feature-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 4px;
      height: 50%;
      background: var(--accent);
      border-radius: 0 0 6px 0;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      border-color: var(--primary);
      box-shadow: 0 0 24px rgba(233,64,87,0.2);
    }
    .feature-card h3 {
      color: #fff;
      font-size: 1.3rem;
      margin: 14px 0 8px;
    }
    /* 场景卡片 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .scenario-card {
      background: var(--bg-elevated);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: 0.2s;
    }
    .scenario-card img {
      height: 200px;
      object-fit: cover;
      width: 100%;
    }
    /* 案例数据 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      text-align: center;
      margin-bottom: 56px;
    }
    .stat-number {
      font-size: 3.3rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .case-cards {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .case-item {
      background: var(--bg-card);
      padding: 28px;
      border-radius: var(--radius-card);
      display: flex;
      gap: 20px;
      align-items: center;
      border: 1px solid rgba(255,255,255,0.04);
    }
    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      border-radius: 12px;
      margin-bottom: 14px;
      border-left: 3px solid rgba(0,210,255,0.38);
      transition: 0.2s;
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 700;
      color: #fff;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      padding: 0 28px 20px;
      color: #B0B8C1;
      line-height: 1.8;
    }
    /* CTA 底区 */
    .cta-block {
      background: linear-gradient(145deg, #0f1420 0%, #0a0e1a 100%);
      position: relative;
      text-align: center;
      padding: 80px 0;
    }
    .btn-gold {
      background: var(--gold);
      color: #0A0E17;
      font-weight: 800;
      padding: 18px 48px;
      border-radius: 50px;
      font-size: 1.2rem;
      box-shadow: 0 0 28px rgba(255,184,0,0.35);
    }
    footer {
      background: #0A0E17;
      border-top: 1px solid rgba(0,210,255,0.15);
      padding: 60px 0 28px;
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .container { padding: 0 20px; }
      .value-grid, .features-grid, .scenarios-grid { grid-template-columns: 1fr; }
      .case-cards { grid-template-columns: 1fr; }
      .stats-row { flex-direction: column; gap: 28px; }
    }