/* roulang page: index */
:root {
      --bg-deep: #0B0C0E;
      --accent-red: #E63946;
      --accent-red-hover: #C1121F;
      --ice-blue: #A8DADC;
      --white-soft: #F1FAEE;
      --text-light: #D9D9D9;
      --text-muted: #8A8F94;
      --card-bg: rgba(255, 255, 255, 0.04);
      --card-border: rgba(255, 255, 255, 0.05);
      --radius-card: 12px;
      --radius-btn: 6px;
      --shadow-glow: 0 8px 24px rgba(230, 57, 70, 0.15);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
      --font-data: 'DIN Alternate', 'PingFang SC', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-deep);
      color: var(--text-light);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-title);
      color: #FFFFFF;
      margin: 0;
    }

    h1 {
      font-size: 3.2rem;
      font-weight: 700;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 2.4rem;
      font-weight: 600;
      margin-bottom: 1.2rem;
    }

    h3 {
      font-size: 1.4rem;
      font-weight: 500;
      margin-bottom: 0.5rem;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 导航栏 */
    .mk-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11, 12, 14, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 100;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    .logo-area {
      display: flex;
      align-items: baseline;
      gap: 0.5rem;
    }

    .logo-text {
      font-family: var(--font-title);
      font-size: 1.8rem;
      font-weight: 700;
      color: #FFFFFF;
      text-shadow: 0 0 12px rgba(230,57,70,0.7);
      letter-spacing: 1px;
    }

    .logo-domain {
      font-size: 0.8rem;
      color: var(--ice-blue);
      font-weight: 400;
      letter-spacing: 0.5px;
    }

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

    .nav-links a {
      color: #FFFFFF;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 0.25rem 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-red);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: var(--accent-red);
    }

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

    .nav-cta {
      background: var(--accent-red);
      color: white !important;
      padding: 0.5rem 1.2rem !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 2px 8px rgba(230,57,70,0.4);
      transition: all 0.25s ease;
    }

    .nav-cta:hover {
      background: var(--accent-red-hover);
      box-shadow: 0 4px 16px rgba(230,57,70,0.6);
      transform: scale(1.03);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: white;
      cursor: pointer;
    }

    /* Hero */
    .hero-section {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #1A1D22 0%, #0B0C0E 80%);
      position: relative;
      overflow: hidden;
      margin-top: 0;
    }

    .hero-bg-particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      z-index: 0;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      margin-top: 2rem;
    }

    .hero-content h1 {
      margin-bottom: 1.2rem;
    }

    .hero-sub {
      font-size: 1.25rem;
      color: var(--ice-blue);
      margin-bottom: 2.2rem;
      font-weight: 400;
    }

    .btn-primary {
      background: var(--accent-red);
      color: white;
      font-weight: 600;
      padding: 0.9rem 2.4rem;
      border-radius: var(--radius-btn);
      display: inline-flex;
      align-items: center;
      gap: 0.6rem;
      font-size: 1.1rem;
      box-shadow: 0 2px 10px rgba(230,57,70,0.4);
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
    }

    .btn-primary i {
      transition: transform 0.2s;
    }

    .btn-primary:hover {
      background: var(--accent-red-hover);
      box-shadow: 0 8px 22px rgba(230,57,70,0.6);
      transform: scale(1.03);
      color: white;
    }

    .btn-primary:hover i {
      transform: translateX(4px);
    }

    /* 通用板块 */
    .section {
      padding: 100px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 3.5rem;
    }

    .section-title h2 {
      display: inline-block;
      position: relative;
    }

    .section-title h2::after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 50%;
      transform: translateX(-50%);
      width: 60px;
      height: 3px;
      background: var(--accent-red);
      border-radius: 2px;
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      text-align: center;
      backdrop-filter: blur(8px);
      transition: all 0.3s ease;
    }

    .metric-card:hover {
      box-shadow: var(--shadow-glow);
      border-color: rgba(230,57,70,0.25);
    }

    .metric-icon {
      font-size: 2rem;
      color: var(--ice-blue);
      margin-bottom: 1rem;
    }

    .metric-number {
      font-family: var(--font-data);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-red);
      line-height: 1.2;
    }

    .metric-label {
      color: var(--text-muted);
      font-size: 0.9rem;
      margin-top: 0.5rem;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: 8px;
      padding: 28px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      cursor: pointer;
    }

    .service-card:hover {
      border-color: rgba(230,57,70,0.3);
      background: rgba(255,255,255,0.06);
      box-shadow: 0 8px 20px rgba(0,0,0,0.4);
    }

    .service-icon {
      width: 64px;
      height: 64px;
      margin-bottom: 1.5rem;
      background: rgba(168,218,220,0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      color: var(--ice-blue);
    }

    .service-card h3 {
      margin-bottom: 0.5rem;
    }

    .service-card p {
      color: var(--text-muted);
      font-size: 0.95rem;
      flex: 1;
    }

    .service-arrow {
      align-self: flex-end;
      margin-top: 1.2rem;
      color: var(--accent-red);
      transition: transform 0.2s;
    }

    .service-card:hover .service-arrow {
      transform: translateX(6px);
    }

    /* 对比区 */
    .compare-wrapper {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .compare-card {
      flex: 1;
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: 12px;
      padding: 2.2rem;
    }

    .compare-card.left {
      border-left: 3px solid #4a4f55;
    }

    .compare-card.right {
      border-left: 3px solid var(--accent-red);
      background: rgba(230,57,70,0.04);
    }

    .compare-vs {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-red);
      background: rgba(230,57,70,0.15);
      width: 70px;
      height: 70px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
    }

    .compare-title {
      font-size: 1.4rem;
      margin-bottom: 1rem;
    }

    .compare-stat {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-red);
    }

    .compare-desc {
      color: var(--text-muted);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      margin-bottom: 0.5rem;
    }

    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      color: white;
      font-size: 1.1rem;
      font-weight: 600;
      padding: 1.2rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      text-align: left;
      font-family: var(--font-title);
    }

    .faq-icon {
      font-size: 1.5rem;
      color: var(--accent-red);
      transition: transform 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.2s;
      color: var(--text-light);
      padding: 0 0;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 0 1.2rem 0;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(180deg, #0f1115 0%, #0B0C0E 100%);
    }

    .cta-box {
      background: rgba(20,22,26,0.9);
      border: 1px solid rgba(230,57,70,0.2);
      border-radius: 16px;
      padding: 3rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 2rem;
    }

    .cta-left h2 {
      margin-bottom: 0.5rem;
    }

    .cta-form {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .cta-form input {
      background: #1c1f24;
      border: 1px solid #3A3D42;
      color: white;
      padding: 0.8rem 1.2rem;
      border-radius: 6px;
      font-size: 1rem;
      outline: none;
      transition: 0.2s;
      min-width: 180px;
    }

    .cta-form input:focus {
      border-color: var(--accent-red);
      box-shadow: 0 0 8px rgba(230,57,70,0.3);
    }

    .btn-submit {
      background: var(--accent-red);
      border: none;
      color: white;
      font-weight: 600;
      padding: 0.8rem 2rem;
      border-radius: 6px;
      cursor: pointer;
      box-shadow: 0 0 12px rgba(230,57,70,0.5);
      transition: 0.25s;
    }

    .btn-submit:hover {
      background: #C1121F;
      box-shadow: 0 0 20px rgba(230,57,70,0.7);
    }

    /* Footer */
    .footer {
      background: #090a0c;
      padding: 3rem 0 1.5rem;
      border-top: 1px solid #1e2126;
    }

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

    .footer-links a {
      display: block;
      color: var(--text-muted);
      margin-bottom: 0.5rem;
      transition: color 0.2s;
    }

    .footer-links a:hover {
      color: var(--accent-red);
    }

    .copyright {
      text-align: center;
      color: var(--text-muted);
      font-size: 0.85rem;
      margin-top: 2rem;
      padding-top: 1rem;
      border-top: 1px solid #222;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 2.8rem; }
      .services-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .compare-wrapper { flex-direction: column; }
      .compare-vs { margin: 0.5rem 0; }
      .footer-grid { grid-template-columns: 1fr; }
      .cta-box { flex-direction: column; align-items: flex-start; }
    }

    @media (max-width: 640px) {
      h1 { font-size: 2rem; }
      h2 { font-size: 1.8rem; }
      .services-grid { grid-template-columns: 1fr; }
      .metrics-grid { grid-template-columns: 1fr 1fr; }
      .cta-form { flex-direction: column; width: 100%; }
      .cta-form input { width: 100%; }
    }