/* roulang page: index */
:root {
      --bg-primary: #0A0E27;
      --bg-secondary: #111633;
      --bg-deep: #070B1F;
      --accent-ice: #00D4FF;
      --accent-purple: #7B61FF;
      --accent-green: #00F0A8;
      --accent-warm: #FFB444;
      --text-primary: #E8ECFF;
      --text-secondary: #8890B5;
      --text-muted: #556;
      --glass-bg: rgba(17, 22, 51, 0.65);
      --glass-border: rgba(255, 255, 255, 0.08);
      --radius-xl: 16px;
      --radius-lg: 12px;
      --radius-md: 8px;
      --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 28px rgba(0, 212, 255, 0.45);
      --shadow-elevate: 0 4px 20px rgba(0, 212, 255, 0.08);
      --font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
      --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-family);
      background-color: var(--bg-primary);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 1rem;
      overflow-x: hidden;
      font-variant-numeric: tabular-nums;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
      transition: var(--transition);
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 39, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 212, 255, 0.15);
      z-index: 1000;
      transition: var(--transition);
    }

    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: baseline;
      gap: 0.4rem;
      font-weight: 800;
      font-size: 1.5rem;
      color: var(--text-primary);
      letter-spacing: -0.01em;
    }

    .logo .domain {
      font-size: 0.65rem;
      font-weight: 400;
      color: var(--text-secondary);
      opacity: 0.7;
    }

    .nav {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      position: relative;
    }

    .nav a:hover,
    .nav a.active {
      color: var(--accent-ice);
    }

    .nav a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-ice);
      transition: width 0.25s ease;
    }

    .nav a:hover::after {
      width: 100%;
    }

    .btn-cta-sm {
      background: var(--accent-ice);
      color: var(--bg-primary);
      font-weight: 700;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-glow);
      font-size: 0.9rem;
      margin-left: 1rem;
    }

    .btn-cta-sm:hover {
      box-shadow: 0 0 40px rgba(0, 212, 255, 0.7);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-primary);
      transition: var(--transition);
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 39, 0.95);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-top: 1px solid rgba(0, 212, 255, 0.15);
      z-index: 1001;
      padding: 0.5rem 1rem;
      justify-content: space-around;
      align-items: center;
    }

    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      color: var(--text-secondary);
      gap: 0.2rem;
    }

    .mobile-bottom-nav a.active {
      color: var(--accent-ice);
    }

    .mobile-bottom-nav .indicator {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: transparent;
    }

    .mobile-bottom-nav a.active .indicator {
      background: var(--accent-ice);
      box-shadow: 0 0 8px var(--accent-ice);
    }

    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(10, 14, 39, 0.9) 0%, rgba(10, 14, 39, 0.65) 60%, rgba(10, 14, 39, 0.4) 100%);
      z-index: 1;
    }

    .hero .container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      align-items: center;
    }

    .hero-content {
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      background: rgba(0, 212, 255, 0.1);
      border: 1px solid rgba(0, 212, 255, 0.3);
      padding: 0.4rem 1.2rem;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--accent-ice);
      width: fit-content;
    }

    .hero h1 {
      font-weight: 800;
      font-size: clamp(2.8rem, 6vw, 4.5rem);
      letter-spacing: -0.02em;
      line-height: 1.15;
      color: var(--text-primary);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      max-width: 450px;
    }

    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent-ice);
      color: var(--bg-primary);
      font-weight: 700;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-glow);
      font-size: 1rem;
    }

    .btn-primary:hover {
      box-shadow: 0 0 40px rgba(0, 212, 255, 0.7);
      transform: translateY(-2px);
    }

    .btn-ghost {
      background: transparent;
      border: 1.5px solid var(--accent-ice);
      color: var(--accent-ice);
      font-weight: 600;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-lg);
    }

    .btn-ghost:hover {
      background: rgba(0, 212, 255, 0.1);
    }

    .hero-visual {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .glow-sphere {
      width: 320px;
      height: 320px;
      background: radial-gradient(circle, rgba(0,212,255,0.2) 0%, rgba(123,97,255,0.1) 60%, transparent 80%);
      border-radius: 50%;
      filter: blur(40px);
      position: absolute;
    }

    .particle-line {
      width: 180px;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--accent-ice), transparent);
      position: absolute;
      opacity: 0.6;
    }

    /* 板块通用 */
    section {
      padding: 90px 0;
    }

    .section-title {
      font-weight: 700;
      font-size: clamp(2rem, 4vw, 2.8rem);
      letter-spacing: -0.01em;
      margin-bottom: 1.8rem;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      position: absolute;
      bottom: -12px;
      left: 0;
      width: 40px;
      height: 3px;
      background: var(--accent-ice);
      box-shadow: 0 0 12px var(--accent-ice);
    }

    .section-desc {
      color: var(--text-secondary);
      margin-bottom: 2.5rem;
    }

    /* 核心优势 */
    #features .grid-features {
      display: grid;
      grid-template-columns: repeat(12, 1fr);
      gap: 1.8rem;
    }

    .feature-card-large {
      grid-column: span 8;
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-xl);
      padding: 2.5rem;
      box-shadow: var(--shadow-glass);
      display: flex;
      gap: 2rem;
      align-items: center;
      transition: var(--transition);
    }

    .feature-card-large:hover {
      border-color: rgba(255, 255, 255, 0.2);
      box-shadow: 0 12px 40px rgba(0, 212, 255, 0.15);
    }

    .feature-icon-glow {
      width: 80px;
      height: 80px;
      background: rgba(0, 212, 255, 0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      color: var(--accent-ice);
      box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
    }

    .feature-card-small {
      grid-column: span 4;
      background: var(--bg-secondary);
      border-radius: var(--radius-lg);
      padding: 1.8rem;
      border-top: 3px solid var(--accent-ice);
      box-shadow: var(--shadow-elevate);
      transition: var(--transition);
    }

    .feature-card-small:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 30px rgba(0, 212, 255, 0.15);
    }

    /* 解决方案 */
    .solution-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
      margin-bottom: 4rem;
    }

    .solution-img {
      border-radius: var(--radius-xl);
      overflow: hidden;
      border: 1px solid rgba(255, 255, 255, 0.1);
      box-shadow: 0 0 20px rgba(0, 212, 255, 0.1);
    }

    .solution-text h3 {
      font-weight: 600;
      font-size: 1.7rem;
      margin-bottom: 1rem;
    }

    .solution-text ul {
      list-style: none;
      margin: 1.5rem 0;
    }

    .solution-text li {
      padding-left: 1.5rem;
      position: relative;
      margin-bottom: 0.5rem;
      color: var(--text-secondary);
    }

    .solution-text li::before {
      content: '';
      position: absolute;
      left: 0;
      top: 10px;
      width: 8px;
      height: 8px;
      background: var(--accent-ice);
      border-radius: 50%;
    }

    .link-arrow {
      color: var(--accent-ice);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
    }

    .link-arrow:hover {
      text-decoration: underline;
    }

    /* 数据 */
    #results {
      background: linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-primary) 100%);
      position: relative;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1rem;
      text-align: center;
    }

    .stat-item {
      padding: 2rem;
    }

    .stat-number {
      font-weight: 700;
      font-size: 2.8rem;
      color: var(--accent-green);
    }

    .stat-label {
      color: var(--text-secondary);
      margin-top: 0.5rem;
    }

    /* 证言 */
    .testimonial-scroll {
      display: flex;
      gap: 1.5rem;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 1rem;
      -webkit-overflow-scrolling: touch;
    }

    .testimonial-scroll::-webkit-scrollbar {
      display: none;
    }

    .testimonial-card {
      flex: 0 0 380px;
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-xl);
      padding: 2rem;
      box-shadow: var(--shadow-glass);
      scroll-snap-align: start;
    }

    .testimonial-avatar {
      width: 48px;
      height: 48px;
      background: linear-gradient(135deg, var(--accent-ice), var(--accent-purple));
      border-radius: 50%;
      margin-bottom: 1rem;
    }

    /* FAQ */
    .faq-group {
      margin-bottom: 2rem;
    }

    .faq-group h3 {
      font-weight: 600;
      margin-bottom: 1rem;
      color: var(--accent-ice);
    }

    .faq-item {
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      padding: 1rem 0;
      cursor: pointer;
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      margin-top: 0.8rem;
    }

    /* CTA */
    #cta {
      background: var(--bg-deep);
      text-align: center;
      padding: 100px 0;
    }

    #cta h2 {
      font-size: 2.5rem;
      margin-bottom: 1rem;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      margin-top: 3rem;
      padding-top: 1.5rem;
      display: flex;
      justify-content: space-between;
      color: var(--text-secondary);
      font-size: 0.9rem;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero .container {
        grid-template-columns: 1fr;
      }
      .feature-card-large {
        grid-column: span 12;
      }
      .feature-card-small {
        grid-column: span 6;
      }
      .solution-row {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      .header {
        background: rgba(10, 14, 39, 0.95);
      }
      body {
        padding-bottom: 70px;
      }
      .feature-card-small {
        grid-column: span 12;
      }
      .testimonial-card {
        flex: 0 0 85vw;
      }
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 480px) {
      .btn-group {
        flex-direction: column;
      }
      .btn-primary, .btn-ghost {
        width: 100%;
        text-align: center;
      }
      .stats-grid {
        grid-template-columns: 1fr;
      }
    }