/* roulang page: index */
:root {
      --color-primary: #FF4D2E;
      --color-primary-hover: #E63A1C;
      --color-dark: #1A1A2E;
      --color-accent: #00D4AA;
      --color-warning: #FFB800;
      --color-bg: #FAFAFA;
      --color-bg-dark: #0F0F1A;
      --color-text: #1A1A2E;
      --color-text-light: #666666;
      --color-white: #FFFFFF;
      --font-sans: 'Noto Sans SC', sans-serif;
      --font-mono: 'Inter', sans-serif;
      --radius-lg: 20px;
      --radius-md: 12px;
      --radius-pill: 50px;
      --shadow-card: 0 4px 24px rgba(26, 26, 46, 0.06);
      --shadow-hover: 0 12px 40px rgba(26, 26, 46, 0.12);
      --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      --container-max: 1280px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

    button, input {
      font-family: var(--font-sans);
      border: none;
      outline: none;
      background: none;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid rgba(0, 0, 0, 0.04);
      display: flex;
      align-items: center;
      transition: height var(--transition);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      padding: 0 24px;
      max-width: var(--container-max);
      margin: 0 auto;
    }

    .logo {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 24px;
      letter-spacing: -0.5px;
      color: var(--color-dark);
    }

    .logo .dot {
      color: var(--color-primary);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-link {
      font-weight: 500;
      font-size: 15px;
      color: rgba(26, 26, 46, 0.8);
      position: relative;
      padding: 8px 0;
      transition: color var(--transition);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 100%;
      height: 2px;
      background: var(--color-primary);
      transition: transform var(--transition);
      border-radius: 1px;
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--color-primary);
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      transform: translateX(-50%) scaleX(1);
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      padding: 4px;
      z-index: 1001;
    }

    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--color-dark);
      border-radius: 2px;
      transition: var(--transition);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--color-dark);
      z-index: 999;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 48px;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s ease;
    }

    .mobile-menu.open {
      opacity: 1;
      pointer-events: auto;
    }

    .mobile-menu .nav-link {
      color: white;
      font-size: 24px;
      font-weight: 400;
    }

    @media (max-width: 767px) {
      .site-header {
        height: 56px;
      }
      .nav-menu {
        display: none;
      }
      .menu-toggle {
        display: flex;
      }
      .mobile-menu {
        display: flex;
      }
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 40px;
      line-height: 1.3;
      text-align: center;
      margin-bottom: 24px;
      color: var(--color-dark);
    }

    .section-sub {
      text-align: center;
      font-size: 18px;
      color: var(--color-text-light);
      max-width: 680px;
      margin: 0 auto 64px;
    }

    @media (max-width: 767px) {
      section {
        padding: 60px 0;
      }
      .section-title {
        font-size: 32px;
      }
      .section-sub {
        font-size: 16px;
        margin-bottom: 40px;
      }
    }

    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background: linear-gradient(135deg, #FFFFFF 0%, #FAFAFA 100%);
      position: relative;
      overflow: hidden;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-left h1 {
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 56px;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--color-dark);
      margin-bottom: 24px;
    }

    .hero-left .subtitle {
      font-size: 18px;
      color: var(--color-text-light);
      margin-bottom: 40px;
      line-height: 1.75;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--color-primary);
      color: white;
      font-weight: 500;
      font-size: 16px;
      padding: 16px 40px;
      border-radius: var(--radius-pill);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background var(--transition), box-shadow var(--transition);
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(255, 77, 46, 0.2);
    }

    .btn-primary:hover {
      background: var(--color-primary-hover);
      box-shadow: 0 8px 24px rgba(255, 77, 46, 0.3);
    }

    .btn-outline {
      border: 2px solid var(--color-primary);
      color: var(--color-primary);
      font-weight: 500;
      font-size: 16px;
      padding: 16px 40px;
      border-radius: var(--radius-pill);
      background: transparent;
      transition: background var(--transition), color var(--transition);
      cursor: pointer;
    }

    .btn-outline:hover {
      background: rgba(255, 77, 46, 0.1);
    }

    .hero-right {
      position: relative;
      background: linear-gradient(135deg, #1A1A2E 0%, rgba(255, 77, 46, 0.15) 100%);
      border-radius: var(--radius-lg);
      padding: 40px;
      display: flex;
      flex-direction: column;
      gap: 24px;
      align-items: center;
      justify-content: center;
      min-height: 420px;
      overflow: hidden;
    }

    .hero-right::before {
      content: '';
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }

    .badge-card {
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      padding: 20px 28px;
      display: flex;
      align-items: center;
      gap: 16px;
      width: fit-content;
      z-index: 2;
    }

    .badge-number {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 36px;
      background: linear-gradient(135deg, #FF4D2E, #FFB800);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .badge-label {
      color: rgba(255, 255, 255, 0.8);
      font-size: 14px;
    }

    @media (max-width: 1023px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-left h1 {
        font-size: 42px;
      }
    }

    @media (max-width: 767px) {
      .hero-left h1 {
        font-size: 36px;
      }
      .hero-right {
        min-height: 300px;
      }
    }

    /* 数据看板 */
    .data-panel {
      background: var(--color-bg);
    }

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

    .metric-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .metric-value {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 48px;
      color: var(--color-primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .trend-up {
      color: var(--color-accent);
      font-size: 24px;
    }

    .metric-label {
      font-size: 14px;
      color: var(--color-text-light);
    }

    @media (max-width: 1023px) {
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 767px) {
      .metrics-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 服务矩阵 */
    .services {
      background: white;
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--color-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      text-align: left;
      transition: var(--transition);
      border: 1px solid transparent;
    }

    .service-card:hover {
      background: white;
      box-shadow: var(--shadow-hover);
      border-color: rgba(0,0,0,0.04);
    }

    .service-icon {
      width: 48px;
      height: 48px;
      color: var(--color-primary);
      margin-bottom: 20px;
    }

    .service-card h3 {
      font-weight: 600;
      font-size: 22px;
      margin-bottom: 12px;
    }

    .service-card p {
      color: var(--color-text-light);
      font-size: 15px;
      margin-bottom: 20px;
    }

    .service-link {
      font-weight: 500;
      color: var(--color-primary);
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: gap var(--transition);
    }

    .service-link:hover {
      gap: 8px;
    }

    @media (max-width: 1023px) {
      .service-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 767px) {
      .service-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比 */
    .compare {
      background: var(--color-bg-dark);
      color: white;
    }

    .compare .section-title {
      color: white;
    }

    .compare-grid {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 20px;
      align-items: center;
    }

    .compare-card {
      border-radius: var(--radius-lg);
      padding: 40px;
    }

    .compare-left {
      background: #2A1A1A;
    }

    .compare-right {
      background: #1A2A2A;
    }

    .compare-badge {
      background: var(--color-warning);
      color: #1A1A2E;
      font-family: var(--font-mono);
      font-weight: 700;
      width: 56px;
      height: 56px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
    }

    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 15px;
    }

    .compare-left .compare-item {
      color: #FF9999;
    }

    .compare-right .compare-item {
      color: #00D4AA;
    }

    @media (max-width: 767px) {
      .compare-grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }
      .compare-badge {
        margin: 0 auto;
      }
    }

    /* FAQ */
    .faq {
      background: var(--color-bg);
    }

    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-card);
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 500;
      font-size: 18px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--color-text-light);
      margin-top: 0;
    }

    .faq-item[open] .faq-answer {
      max-height: 200px;
      margin-top: 16px;
    }

    @media (max-width: 767px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    /* CTA */
    .cta-block {
      background: linear-gradient(135deg, #1A1A2E 0%, rgba(255, 77, 46, 0.2) 100%);
      color: white;
      position: relative;
    }

    .cta-inner {
      text-align: center;
      max-width: 600px;
      margin: 0 auto;
    }

    .cta-form {
      display: flex;
      gap: 12px;
      margin-top: 32px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .cta-input {
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: var(--radius-pill);
      padding: 16px 24px;
      color: white;
      font-size: 16px;
      flex: 1;
      min-width: 240px;
    }

    .cta-input::placeholder {
      color: rgba(255,255,255,0.5);
    }

    .btn-accent {
      background: var(--color-accent);
      color: #1A1A2E;
      font-weight: 600;
      padding: 16px 40px;
      border-radius: var(--radius-pill);
      cursor: pointer;
    }

    /* Footer */
    .footer {
      background: var(--color-bg-dark);
      color: rgba(255,255,255,0.6);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .footer-logo {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 22px;
      color: white;
    }

    .copyright {
      text-align: center;
      margin-top: 40px;
      font-size: 12px;
      color: rgba(255,255,255,0.3);
    }

    @media (max-width: 767px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }