/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --coral-red: #FF4655;
      --cyan-electric: #00E5FF;
      --surface-dark: #141832;
      --text-white: #FFFFFF;
      --text-body: #B0B8D6;
      --text-muted: #6B7394;
      --gold-medal: #FFD700;
      --gradient-warm: linear-gradient(135deg, #FF4655, #FF8A65);
      --gradient-cool: linear-gradient(135deg, #00E5FF, #00B8D4);
      --border-subtle: rgba(255, 70, 85, 0.15);
      --border-glow: rgba(255, 70, 85, 0.5);
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-button: 0 4px 20px rgba(255,70,85,0.4);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-pill: 50px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-body: "Inter", "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition-bounce: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--deep-blue);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      color: var(--text-white);
      margin-bottom: 0.5rem;
    }
    h1 {
      font-size: clamp(2.5rem, 5vw, 4rem);
      font-weight: 900;
      letter-spacing: 2px;
      line-height: 1.2;
    }
    h2 {
      font-size: clamp(1.8rem, 3.5vw, 2.5rem);
      font-weight: 700;
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 1.25rem;
      font-weight: 600;
    }
    a {
      color: inherit;
      text-decoration: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .button {
      cursor: pointer;
      border: none;
      background: none;
      font-family: var(--font-body);
    }
    /* 导航 */
    .glass-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      box-shadow: 0 4px 30px rgba(0,0,0,0.3);
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
    }
    .nav-scrolled {
      background: rgba(10, 14, 39, 0.96);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      height: 72px;
    }
    .logo {
      font-family: var(--font-heading);
      font-size: 1.6rem;
      font-weight: 800;
      background: var(--gradient-warm);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-white);
      transition: color 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--coral-red);
    }
    .nav-cta {
      background: var(--gradient-warm);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      font-size: 0.9rem;
      letter-spacing: 0.5px;
      box-shadow: var(--shadow-button);
      transition: transform 0.2s, filter 0.2s;
    }
    .nav-cta:hover {
      transform: scale(1.03);
      filter: brightness(1.15);
    }
    .mobile-toggle {
      display: none;
      font-size: 1.8rem;
      color: white;
      background: transparent;
      border: none;
    }
    /* Hero */
    .hero {
      padding: 160px 0 100px;
      position: relative;
      background: radial-gradient(circle at 30% 40%, rgba(255,70,85,0.25) 0%, rgba(10,14,39,0) 60%),
                  radial-gradient(circle at 80% 60%, rgba(0,229,255,0.2) 0%, rgba(10,14,39,0) 55%);
      background-color: var(--deep-blue);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 500px;
    }
    .hero-right {
      flex: 1 1 450px;
      position: relative;
    }
    .hero-badge-group {
      display: flex;
      gap: 2rem;
      margin-top: 2rem;
      flex-wrap: wrap;
    }
    .hero-badge {
      text-align: center;
    }
    .hero-badge-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--gold-medal);
      line-height: 1.2;
    }
    .hero-badge-label {
      color: var(--text-body);
      font-size: 0.9rem;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-lg);
      height: 380px;
      width: 100%;
      box-shadow: 0 0 0 2px rgba(255,70,85,0.3), 0 20px 40px rgba(0,0,0,0.6);
      position: relative;
      overflow: hidden;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(255,70,85,0.2), transparent);
      border-radius: inherit;
    }
    .btn-primary {
      background: var(--gradient-warm);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      letter-spacing: 1px;
      box-shadow: var(--shadow-button);
      display: inline-block;
      transition: transform 0.2s, filter 0.2s;
      margin-top: 1.5rem;
    }
    .btn-primary:hover {
      transform: scale(1.03);
      filter: brightness(1.15);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--cyan-electric);
      color: var(--cyan-electric);
      padding: 12px 34px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      letter-spacing: 0.8px;
      transition: all 0.2s;
      margin-left: 1rem;
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.1);
    }
    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    .section-dark {
      background-color: #0A0E27;
    }
    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--surface-dark);
      border-radius: var(--radius-md);
      padding: 2rem 1.5rem;
      border: 1px solid var(--border-subtle);
      box-shadow: var(--shadow-card);
      transition: transform var(--transition-bounce), border-color 0.2s;
    }
    .card:hover {
      transform: translateY(-6px);
      border-color: var(--border-glow);
      box-shadow: 0 14px 36px rgba(0,0,0,0.6);
    }
    .icon-glow {
      width: 60px;
      height: 60px;
      background: radial-gradient(circle, rgba(255,70,85,0.25), transparent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      color: var(--coral-red);
      margin-bottom: 1.2rem;
    }
    /* 数据墙 */
    .stats-wall {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 2rem;
      background: var(--surface-dark);
      border-radius: var(--radius-lg);
      padding: 3rem 2rem;
      margin-top: 2rem;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--gold-medal);
    }
    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--surface-dark);
      border-radius: var(--radius-sm);
      overflow: hidden;
      border: 1px solid var(--border-subtle);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .case-img::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(to top, rgba(10,14,39,0.8), transparent);
    }
    .case-info {
      padding: 1.2rem;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--surface-dark);
      border-left: 4px solid var(--coral-red);
      margin-bottom: 12px;
      border-radius: 8px;
      overflow: hidden;
    }
    .faq-question {
      padding: 1.2rem 1.5rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: rgba(20,24,50,0.8);
      color: var(--text-body);
      padding: 0 1.5rem;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 0 1.5rem 1.2rem;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #FF4655, #FF8A65);
      padding: 80px 0;
      text-align: center;
      border-radius: 0;
    }
    .btn-white {
      background: white;
      color: #0A0E27;
      font-weight: 700;
      padding: 16px 42px;
      border-radius: var(--radius-pill);
      display: inline-block;
      margin-top: 1.5rem;
    }
    /* Footer */
    .footer {
      background: #060918;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    @media (max-width: 1024px) {
      .grid-3, .case-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        background: #0A0E27;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        padding: 1.5rem;
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .grid-3, .case-grid {
        grid-template-columns: 1fr;
      }
      .hero-grid {
        flex-direction: column;
      }
      .hero-badge-group {
        justify-content: center;
      }
      .btn-outline {
        margin-left: 0;
        margin-top: 1rem;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }