/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary: #C8102E;
      --primary-hover: #E0123A;
      --accent: #F5E6D3;
      --bg-deep: #0B0C10;
      --bg-elevated: #121316;
      --bg-footer: #090A0D;
      --glass-bg: rgba(20, 20, 25, 0.6);
      --glass-border: rgba(245, 230, 211, 0.15);
      --text-primary: #FFFFFF;
      --text-body: rgba(255, 255, 255, 0.8);
      --text-muted: rgba(255, 255, 255, 0.5);
      --text-accent: #F5E6D3;
      --border-light: rgba(245, 230, 211, 0.25);
      --shadow-card: 0 20px 40px rgba(0,0,0,0.5), 0 0 0 1px rgba(245,230,211,0.1) inset;
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-number: 'Inter', 'SF Pro Display', sans-serif;
      --container-max: 1280px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(11,12,16,0.75);
      backdrop-filter: blur(15px);
      -webkit-backdrop-filter: blur(15px);
      border-bottom: 1px solid var(--glass-border);
      transition: var(--transition-smooth);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 6px;
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 0.05em;
      color: #FFFFFF;
      white-space: nowrap;
    }
    .logo-diamond {
      display: inline-block;
      width: 10px;
      height: 10px;
      background: var(--primary);
      transform: rotate(45deg);
      margin-left: 2px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.5rem;
      font-weight: 500;
      color: var(--text-body);
    }
    .nav-links a {
      color: var(--text-body);
      position: relative;
      padding: 0.25rem 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s ease;
    }
    .nav-links a:hover {
      color: #FFFFFF;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--primary);
      color: #FFFFFF;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition-smooth);
      box-shadow: 0 0 25px rgba(200,16,46,0.5);
      display: inline-block;
      text-align: center;
      font-size: 0.95rem;
      letter-spacing: 0.02em;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 35px rgba(200,16,46,0.8);
      transform: translateY(-2px);
      color: #FFFFFF;
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid rgba(245,230,211,0.5);
      color: var(--accent);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition-smooth);
      display: inline-block;
      text-align: center;
      font-size: 0.95rem;
    }
    .btn-secondary:hover {
      background: rgba(245,230,211,0.1);
      border-color: var(--accent);
      color: var(--accent);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: #FFFFFF;
      border-radius: 2px;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: absolute;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(11,12,16,0.95);
      backdrop-filter: blur(25px);
      -webkit-backdrop-filter: blur(25px);
      border-bottom: 1px solid var(--glass-border);
      flex-direction: column;
      padding: 24px 0;
      gap: 8px;
    }
    .mobile-menu a {
      color: var(--text-body);
      padding: 12px 24px;
      font-weight: 500;
      display: block;
    }
    .mobile-menu .btn-primary {
      margin: 8px 24px;
      text-align: center;
      width: fit-content;
    }
    /* 区块通用 */
    section {
      padding: 120px 0;
    }
    .section-title {
      font-weight: 700;
      font-size: clamp(2rem, 5vw, 3rem);
      letter-spacing: -0.01em;
      color: var(--text-primary);
      margin-bottom: 1.5rem;
      text-align: center;
    }
    .section-desc {
      max-width: 720px;
      margin: 0 auto 3rem;
      text-align: center;
      color: var(--text-body);
      font-size: 1.1rem;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      background: radial-gradient(circle at 50% 30%, rgba(200,16,46,0.15) 0%, #0B0C10 70%);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-attachment: fixed;
      text-align: center;
      padding-top: 100px;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(11,12,16,0.65);
      backdrop-filter: blur(1px);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 850px;
      padding: 0 24px;
    }
    .hero h1 {
      font-weight: 900;
      font-size: clamp(3rem, 8vw, 5.5rem);
      letter-spacing: -0.02em;
      line-height: 1.1;
      color: #FFFFFF;
      margin-bottom: 1.5rem;
    }
    .hero h1 span {
      color: var(--primary);
    }
    .hero-sub {
      font-size: 1.3rem;
      color: var(--accent);
      max-width: 650px;
      margin: 0 auto 2.5rem;
      line-height: 1.6;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }
    /* 解决方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: var(--radius-card);
      border: 1px solid var(--glass-border);
      box-shadow: var(--shadow-card);
      padding: 40px 30px;
      transition: all 0.4s ease;
    }
    .glass-card:hover {
      transform: translateY(-8px);
      border-color: rgba(245,230,211,0.3);
    }
    .card-icon {
      width: 50px;
      height: 50px;
      margin-bottom: 24px;
      color: var(--accent);
    }
    .card-icon svg {
      width: 100%;
      height: 100%;
      stroke: var(--accent);
      fill: none;
      stroke-width: 1.8;
    }
    .glass-card h3 {
      font-weight: 600;
      font-size: 1.35rem;
      color: #FFFFFF;
      margin-bottom: 1rem;
    }
    /* 数据仪表盘 */
    .stats-area {
      background: var(--bg-elevated);
      border-radius: var(--radius-card);
      padding: 60px 40px;
      position: relative;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }
    .stat-item {
      position: relative;
    }
    .stat-number {
      font-family: var(--font-number);
      font-weight: 800;
      font-size: clamp(2.5rem, 6vw, 4rem);
      color: var(--accent);
      line-height: 1.1;
      margin-bottom: 8px;
    }
    .stat-underline {
      width: 40px;
      height: 4px;
      background: var(--primary);
      margin: 12px auto;
      border-radius: 2px;
    }
    .stat-label {
      color: var(--text-muted);
      font-size: 0.95rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .testimonial-card {
      display: flex;
      gap: 24px;
      align-items: flex-start;
    }
    .avatar-placeholder {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      background: rgba(255,255,255,0.05);
      border: 2px solid var(--primary);
      flex-shrink: 0;
    }
    .testimonial-text {
      font-style: italic;
      font-size: 1.1rem;
      color: rgba(255,255,255,0.9);
      margin-bottom: 12px;
    }
    .testimonial-author {
      font-weight: 600;
      color: #FFFFFF;
    }
    .testimonial-role {
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: rgba(255,255,255,0.03);
      border-radius: 16px;
      border: 1px solid rgba(245,230,211,0.12);
      overflow: hidden;
      transition: all 0.3s;
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      color: #FFFFFF;
      padding: 20px 28px;
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      text-align: left;
      font-family: var(--font-sans);
    }
    .faq-icon {
      font-size: 1.6rem;
      font-weight: 300;
      color: var(--accent);
      transition: transform 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: rgba(255,255,255,0.02);
      color: rgba(255,255,255,0.75);
      padding: 0 28px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 28px 24px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* CTA 终极区 */
    .cta-band {
      background: var(--bg-elevated);
      text-align: center;
      padding: 100px 24px;
      border-radius: var(--radius-card);
      margin: 0 24px;
    }
    .cta-band h2 {
      color: #FFFFFF;
      margin-bottom: 1rem;
    }
    .btn-glow {
      box-shadow: 0 0 35px rgba(200,16,46,0.7);
    }
    /* Footer */
    .footer {
      background: var(--bg-footer);
      padding: 80px 0 30px;
      border-top: 1px solid rgba(245,230,211,0.05);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 50px;
    }
    .footer-logo {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 1.8rem;
      color: #FFFFFF;
      margin-bottom: 1rem;
    }
    .footer-desc {
      color: var(--text-muted);
      max-width: 260px;
    }
    .footer h4 {
      color: #FFFFFF;
      margin-bottom: 1.2rem;
      font-weight: 600;
    }
    .footer a {
      color: var(--text-muted);
      display: block;
      margin-bottom: 0.5rem;
    }
    .footer a:hover {
      color: var(--accent);
    }
    .social-circles {
      display: flex;
      gap: 15px;
      margin-top: 12px;
    }
    .social-circle {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(245,230,211,0.2);
    }
    .copyright {
      text-align: center;
      color: rgba(255,255,255,0.3);
      margin-top: 60px;
      font-size: 0.9rem;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .solution-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links, .header .btn-primary { display: none; }
      .hamburger { display: flex; }
      .mobile-menu.active { display: flex; }
      section { padding: 80px 0; }
      .solution-grid, .testimonial-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr; gap: 40px; }
      .hero h1 { font-size: 2.8rem; }
      .cta-band { margin: 0 16px; }
    }
    @media (max-width: 480px) {
      .stats-grid { grid-template-columns: 1fr; }
      .hero-actions { flex-direction: column; align-items: center; }
    }