/* roulang page: index */
:root {
      --bg-deep: #0B0C10;
      --bg-card-glass: rgba(26, 31, 53, 0.45);
      --deep-indigo: #1A1F35;
      --electric-purple: #7B2FBE;
      --neon-cyan: #00F0FF;
      --milan-gold: #C9A96E;
      --text-primary: #F0F0F5;
      --text-secondary: #9CA3AF;
      --text-card: #E5E7EB;
      --border-glass: rgba(255,255,255,0.08);
      --shadow-purple: rgba(123, 47, 190, 0.15);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --gap-section: 5rem;
      --container-max: 1280px;
      --transition-default: 0.3s cubic-bezier(0.23, 1, 0.32, 1);
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background: radial-gradient(circle at 20% 20%, #131829, #0B0C10 80%);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(11, 12, 16, 0.35);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      box-shadow: 0 4px 24px rgba(0,0,0,0.5);
      transition: background var(--transition-default);
    }

    .nav.scrolled {
      background: rgba(11, 12, 16, 0.88);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 1rem 2rem;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 1px;
      color: var(--text-primary);
      text-shadow: 0 0 12px rgba(0,240,255,0.5);
      text-decoration: none;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      transition: color var(--transition-default), text-shadow var(--transition-default);
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a:focus-visible {
      color: var(--neon-cyan);
      text-shadow: 0 0 8px var(--neon-cyan);
      outline: none;
    }

    .nav-cta {
      background: linear-gradient(135deg, var(--electric-purple), var(--neon-cyan));
      padding: 0.5rem 1.5rem;
      border-radius: 2rem;
      color: #fff !important;
      font-weight: 600;
      box-shadow: 0 0 18px rgba(0,240,255,0.5);
      transition: box-shadow var(--transition-default), transform var(--transition-default);
      white-space: nowrap;
    }

    .nav-cta:hover {
      box-shadow: 0 0 30px rgba(0,240,255,0.8);
      transform: scale(1.03);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--text-primary);
      border-radius: 4px;
      transition: var(--transition-default);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      background-color: rgba(11, 12, 16, 0.7);
    }
    .hero::after {
      content: '';
      position: absolute;
      top:0;left:0;right:0;bottom:0;
      background: radial-gradient(circle at 30% 40%, rgba(123,47,190,0.12), transparent 60%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }
    .hero h1 {
      font-size: clamp(2.8rem, 6vw, 4.5rem);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-highlight {
      background: linear-gradient(to right, var(--neon-cyan), #b16dff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 2.5rem;
      max-width: 600px;
    }
    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 1.2rem;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--electric-purple), var(--neon-cyan));
      border: none;
      padding: 1rem 2.5rem;
      border-radius: var(--radius-md);
      color: white;
      font-weight: 700;
      font-size: 1.1rem;
      cursor: pointer;
      box-shadow: 0 0 22px rgba(0,240,255,0.55);
      transition: all var(--transition-default);
      text-decoration: none;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0,240,255,0.9);
      transform: translateY(-3px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.3);
      padding: 1rem 2.5rem;
      border-radius: var(--radius-md);
      color: var(--text-primary);
      font-weight: 600;
      backdrop-filter: blur(8px);
      transition: all var(--transition-default);
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline:hover {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 20px rgba(0,240,255,0.4);
      color: var(--neon-cyan);
    }

    section {
      padding: var(--gap-section) 0;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 1rem;
      letter-spacing: 0.5px;
    }
    .section-sub {
      text-align: center;
      color: var(--text-secondary);
      margin-bottom: 3rem;
      font-size: 1.1rem;
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .pain-card {
      background: rgba(26, 31, 53, 0.65);
      backdrop-filter: blur(14px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-lg);
      padding: 2.2rem;
      text-align: center;
      box-shadow: 0 8px 28px rgba(0,0,0,0.5);
    }
    .pain-icon {
      font-size: 2.8rem;
      margin-bottom: 1.5rem;
      opacity: 0.9;
    }

    /* 方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .glass-card {
      background: var(--bg-card-glass);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: 0 8px 32px rgba(0,0,0,0.4);
      transition: transform var(--transition-default), box-shadow var(--transition-default), border-color var(--transition-default);
    }
    .glass-card:hover {
      transform: translateY(-10px);
      border-color: rgba(0,240,255,0.3);
      box-shadow: 0 16px 40px rgba(0,240,255,0.15);
    }
    .card-icon {
      width: 56px;
      height: 56px;
      background: rgba(255,255,255,0.04);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      color: var(--neon-cyan);
      margin-bottom: 1.5rem;
      box-shadow: 0 0 18px rgba(0,240,255,0.3);
    }
    .feature-list {
      list-style: none;
      margin-top: 1.5rem;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      color: var(--text-card);
      margin-bottom: 0.5rem;
    }

    /* 数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .stat-number {
      font-size: 3.2rem;
      font-weight: 800;
      background: linear-gradient(to right, var(--neon-cyan), var(--electric-purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 0 18px rgba(0,240,255,0.6);
    }

    /* 证言 */
    .testimonial-scroll {
      display: flex;
      gap: 2rem;
      overflow-x: auto;
      padding: 1rem 0 2rem;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      min-width: 320px;
      flex: 0 0 auto;
      background: var(--bg-card-glass);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-lg);
      padding: 2rem;
      scroll-snap-align: start;
    }
    .quote-mark {
      font-size: 3rem;
      color: var(--milan-gold);
      line-height: 1;
    }

    /* FAQ */
    .faq-item {
      background: rgba(26,31,53,0.4);
      backdrop-filter: blur(10px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-md);
      margin-bottom: 1rem;
      overflow: hidden;
    }
    .faq-question {
      padding: 1.2rem 1.8rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-primary);
    }
    .faq-answer {
      padding: 0 1.8rem 1.2rem;
      color: var(--text-card);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-section {
      background: radial-gradient(circle at center, rgba(123,47,190,0.25), transparent 70%);
      text-align: center;
      padding: 5rem 0;
    }

    /* Footer */
    .footer {
      background: #0B0C10;
      border-top: 1px solid var(--milan-gold);
      padding: 3rem 0;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1.5fr 1fr;
      gap: 2.5rem;
    }
    .footer input {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      padding: 0.8rem;
      border-radius: var(--radius-sm);
      color: white;
      width: 100%;
      margin-bottom: 1rem;
    }
    .footer input:focus {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
      outline: none;
    }

    @media (max-width: 1024px) {
      .pain-grid, .solution-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .pain-grid, .solution-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 2.5rem; }
      .testimonial-scroll { flex-wrap: nowrap; }
    }