/* roulang page: index */
:root {
      --color-primary: #0A1F3F;
      --color-accent: #00E5A0;
      --color-danger: #FF4655;
      --color-bg: #F8FAFC;
      --color-card: #FFFFFF;
      --color-dark-bg: #0A1F3F;
      --color-text-primary: #1E293B;
      --color-text-secondary: #64748B;
      --color-text-on-dark: #FFFFFF;
      --color-border: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-card: 0 1px 3px rgba(10,31,63,0.08), 0 1px 2px rgba(10,31,63,0.06);
      --shadow-card-hover: 0 10px 25px rgba(10,31,63,0.12);
      --shadow-nav: 0 2px 20px rgba(0,0,0,0.08);
      --transition-base: 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", -apple-system, sans-serif;
      --font-mono: "SF Mono", "Menlo", "Monaco", "Consolas", monospace;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.7;
      color: var(--color-text-primary);
      background-color: var(--color-bg);
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

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

    h1, h2, h3, h4 {
      font-weight: 600;
      line-height: 1.3;
    }

    h1 {
      font-size: 48px;
      letter-spacing: -0.5px;
      font-weight: 700;
    }

    h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 24px;
      margin-bottom: 12px;
    }

    .section {
      padding: 100px 0;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      z-index: 1000;
      transition: box-shadow var(--transition-base), background var(--transition-base);
    }

    .nav.scrolled {
      box-shadow: var(--shadow-nav);
      background: rgba(255,255,255,0.98);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 20px;
      color: var(--color-primary);
      white-space: nowrap;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--color-accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--color-primary);
      font-weight: 700;
      font-size: 18px;
      box-shadow: 0 0 12px rgba(0,229,160,0.5);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: var(--color-text-primary);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
    }

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

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

    .btn-primary {
      background: var(--color-accent);
      color: var(--color-primary);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      box-shadow: 0 4px 12px rgba(0,229,160,0.3);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .btn-primary:hover {
      background: #00CC8E;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(0,229,160,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--color-primary);
      color: var(--color-primary);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-size: 15px;
    }

    .btn-outline:hover {
      background: var(--color-primary);
      color: white;
      transform: translateY(-2px);
    }

    .btn-cta {
      background: var(--color-danger);
      color: white;
      font-weight: 600;
      padding: 16px 36px;
      border-radius: var(--radius-sm);
      font-size: 17px;
      box-shadow: 0 6px 18px rgba(255,70,85,0.4);
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255,70,85,0.5); }
      70% { box-shadow: 0 0 0 15px rgba(255,70,85,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,70,85,0); }
    }

    .btn-cta:hover {
      background: #E63946;
      transform: translateY(-3px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      width: 28px;
      height: 3px;
      background: var(--color-primary);
      border-radius: 3px;
      transition: all 0.3s;
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background: var(--color-bg);
      background-image: radial-gradient(circle at 80% 30%, rgba(0,229,160,0.05) 0%, transparent 50%);
      position: relative;
      overflow: hidden;
    }

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

    .hero-content h1 {
      margin-bottom: 20px;
      color: var(--color-primary);
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--color-text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-visual {
      background: var(--color-card);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-card-hover);
      display: flex;
      flex-direction: column;
      gap: 16px;
      border: 1px solid var(--color-border);
    }

    .live-badge {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 600;
      color: var(--color-danger);
    }

    .live-dot {
      width: 10px;
      height: 10px;
      background: var(--color-danger);
      border-radius: 50%;
      animation: blink 1.2s infinite;
    }

    @keyframes blink {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.3; }
    }

    .data-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 12px 0;
      border-bottom: 1px solid var(--color-border);
      font-family: var(--font-mono);
    }

    .team {
      font-weight: 600;
      color: var(--color-text-primary);
    }

    .score {
      font-size: 22px;
      font-weight: 700;
      color: var(--color-accent);
      background: rgba(0,229,160,0.1);
      padding: 4px 12px;
      border-radius: 6px;
    }

    .counter-text {
      font-size: 14px;
      color: var(--color-text-secondary);
      text-align: right;
    }

    /* Features */
    .features {
      background: var(--color-card);
    }

    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 60px;
    }

    .section-header h2 {
      color: var(--color-primary);
    }

    .section-header p {
      color: var(--color-text-secondary);
      font-size: 18px;
    }

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

    .feature-card {
      background: var(--color-bg);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition-base);
      border: 1px solid transparent;
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
      border-color: var(--color-accent);
    }

    .feature-visual {
      height: 80px;
      display: flex;
      align-items: center;
      margin-bottom: 20px;
    }

    .mini-chart {
      display: flex;
      align-items: flex-end;
      gap: 4px;
      height: 50px;
    }

    .bar {
      width: 14px;
      background: var(--color-accent);
      border-radius: 4px 4px 0 0;
      animation: growBar 1.5s infinite alternate;
    }

    @keyframes growBar {
      0% { height: 30%; }
      100% { height: 100%; }
    }

    .feature-card h3 {
      color: var(--color-primary);
    }

    .feature-card p {
      color: var(--color-text-secondary);
      flex-grow: 1;
    }

    .link-more {
      color: var(--color-accent);
      font-weight: 600;
      margin-top: 16px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* Functions */
    .functions .func-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }

    .func-row:last-child {
      margin-bottom: 0;
    }

    .func-img {
      background: var(--color-card);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-card);
      height: 300px;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .func-img img {
      border-radius: var(--radius-md);
      object-fit: cover;
      height: 100%;
      width: 100%;
    }

    .func-text h3 {
      color: var(--color-primary);
    }

    .func-text p {
      color: var(--color-text-secondary);
      margin-bottom: 16px;
    }

    .tag {
      background: rgba(0,229,160,0.15);
      color: var(--color-primary);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      display: inline-block;
      margin-right: 8px;
    }

    /* Scenarios */
    .scenarios {
      background: var(--color-card);
    }

    .scenario-card {
      background: var(--color-bg);
      border-radius: var(--radius-md);
      padding: 32px;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: all var(--transition-base);
    }

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

    .scenario-img {
      width: 100%;
      height: 180px;
      border-radius: var(--radius-md);
      background: #E2E8F0;
      margin-bottom: 20px;
      overflow: hidden;
    }

    .scenario-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* Cases */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--color-card);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 20px;
      align-items: center;
      transition: all var(--transition-base);
    }

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

    .case-stat {
      font-size: 36px;
      font-weight: 700;
      color: var(--color-accent);
      font-family: var(--font-mono);
    }

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

    .faq-item {
      border-bottom: 1px solid var(--color-border);
      padding: 20px 0;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
    }

    .faq-icon {
      font-size: 24px;
      color: var(--color-accent);
      transition: transform 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      color: var(--color-text-secondary);
      padding-left: 8px;
      border-left: 2px solid transparent;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 12px 0 12px 16px;
      border-left-color: var(--color-accent);
      background: #F1F5F9;
      border-radius: 0 8px 8px 0;
      margin-top: 8px;
    }

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

    /* CTA Banner */
    .cta-banner {
      background: var(--color-dark-bg);
      padding: 80px 0;
      position: relative;
      overflow: hidden;
    }

    .cta-banner::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle, rgba(0,229,160,0.1) 1px, transparent 1px);
      background-size: 30px 30px;
      pointer-events: none;
    }

    .cta-content {
      text-align: center;
      position: relative;
      z-index: 2;
    }

    .cta-content h2 {
      color: white;
    }

    .cta-content p {
      color: var(--color-accent);
      font-size: 20px;
      margin-bottom: 32px;
    }

    /* Footer */
    .footer {
      background: var(--color-dark-bg);
      color: #94A3B8;
      padding: 60px 0 30px;
    }

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

    .footer-logo {
      color: white;
      font-weight: 700;
      font-size: 20px;
      margin-bottom: 12px;
    }

    .footer a {
      color: #94A3B8;
      display: block;
      margin-bottom: 8px;
    }

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

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      font-size: 14px;
    }

    .back-to-top {
      background: var(--color-accent);
      color: var(--color-primary);
      width: 40px;
      height: 40px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .hero .container { grid-template-columns: 1fr; text-align: center; }
      .hero-buttons { justify-content: center; }
      .functions .func-row { grid-template-columns: 1fr; }
      .cases-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .nav-links.mobile-open {
        display: flex;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--color-primary);
        flex-direction: column;
        padding: 32px;
        gap: 24px;
      }
      .nav-links.mobile-open a { color: white; }
      .grid-3 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .section { padding: 60px 0; }
    }

    @media (max-width: 520px) {
      .footer-grid { grid-template-columns: 1fr; }
      .hero { padding: 120px 0 60px; }
    }