/* roulang page: index */
:root {
      --primary: #FF4D00;
      --primary-hover: #e64400;
      --secondary: #1A1A1A;
      --accent: #00E5FF;
      --accent-glow: rgba(0, 229, 255, 0.25);
      --bg: #F5F6F8;
      --surface: #FFFFFF;
      --dark-panel: #1E1E1E;
      --text-title: #111111;
      --text-body: #555555;
      --text-light: #777777;
      --success: #00C853;
      --danger: #FF1744;
      --border-light: rgba(0, 0, 0, 0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-dock: 40px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-glow: 0 8px 24px rgba(255,77,0,0.12);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", "Roboto", sans-serif;
      --font-mono: "JetBrains Mono", "Fira Code", monospace;
      --transition: 0.25s cubic-bezier(0.2, 0.0, 0, 1.0);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    h1, h2, h3, .h2, .h3 {
      color: var(--text-title);
      font-weight: 700;
    }

    h1 {
      font-weight: 800;
      font-size: clamp(2.5rem, 5vw, 4rem);
      letter-spacing: -0.02em;
      line-height: 1.2;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 3rem;
    }
    .section-title::before {
      content: '';
      display: inline-block;
      width: 4px;
      height: 28px;
      background: var(--primary);
      border-radius: 2px;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      opacity: 0.9;
    }

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
      font-weight: 600;
      transition: var(--transition);
    }

    /* 导航 Dock */
    .nav-dock {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 1000;
      width: 90%;
      max-width: 720px;
      background: rgba(26, 26, 26, 0.92);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: var(--radius-dock);
      padding: 10px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 10px 25px rgba(0,0,0,0.3);
      transition: var(--transition);
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.4rem;
      color: white;
      letter-spacing: 0.5px;
    }
    .logo-dot {
      width: 10px;
      height: 10px;
      background: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 10px var(--accent);
      margin-right: 4px;
    }

    .nav-links {
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .nav-links a {
      color: rgba(255,255,255,0.8);
      font-weight: 500;
      font-size: 0.95rem;
      transition: var(--transition);
      text-decoration: none;
      padding: 4px 0;
    }
    .nav-links a:hover {
      color: white;
    }

    .btn-primary-sm {
      background: var(--primary);
      color: white;
      padding: 10px 20px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: var(--transition);
      border: none;
    }
    .btn-primary-sm:hover {
      background: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(255,77,0,0.4);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      line-height: 1;
    }

    /* Hero */
    .hero {
      background: var(--secondary);
      padding: 140px 0 100px;
      position: relative;
      overflow: hidden;
      color: white;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      color: white;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.75);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
    }
    .btn-outline {
      border: 2px solid var(--accent);
      color: var(--accent);
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.08);
    }

    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .score-card {
      background: rgba(30,30,30,0.8);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 20px;
      padding: 32px 36px;
      text-align: center;
      color: white;
      box-shadow: 0 20px 35px rgba(0,0,0,0.5);
    }
    .match-teams {
      font-size: 1.5rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      gap: 24px;
    }
    .score-number {
      font-family: var(--font-mono);
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--accent);
      margin: 12px 0;
      letter-spacing: 2px;
      animation: pulseScore 2s infinite;
    }
    @keyframes pulseScore {
      0% { text-shadow: 0 0 5px var(--accent); }
      50% { text-shadow: 0 0 18px var(--accent), 0 0 30px var(--primary); }
      100% { text-shadow: 0 0 5px var(--accent); }
    }

    .particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle at 30% 40%, rgba(0,229,255,0.08) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
    }

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

    /* 优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .adv-card {
      background: var(--surface);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: center;
    }
    .adv-card:hover {
      box-shadow: var(--shadow-glow);
      transform: translateY(-4px);
    }
    .adv-icon {
      margin-bottom: 20px;
      color: var(--accent);
      transition: var(--transition);
    }
    .adv-card:hover .adv-icon {
      color: var(--primary);
    }

    /* 数据看板 */
    .dashboard-panel {
      background: var(--dark-panel);
      border-radius: 16px;
      padding: 40px;
      color: white;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(0,229,255,0.2);
      border-radius: 12px;
      padding: 20px;
      text-align: center;
    }
    .stat-value {
      font-family: var(--font-mono);
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .stat-label {
      color: rgba(255,255,255,0.7);
      margin-top: 8px;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--surface);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      box-shadow: var(--shadow-glow);
    }
    .service-icon {
      color: var(--accent);
      margin-bottom: 16px;
    }
    .service-link {
      margin-top: 12px;
      font-weight: 600;
      color: var(--primary);
    }

    /* 对比 */
    .comparison-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .compare-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }
    .compare-left {
      border-left: 4px solid #ccc;
    }
    .compare-right {
      border-left: 4px solid var(--primary);
    }
    .check-item {
      display: flex;
      align-items: center;
      gap: 10px;
      margin: 14px 0;
    }

    /* FAQ */
    .faq-item {
      background: var(--surface);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
      background: white;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 24px;
      background: #fdfdfd;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px;
    }
    .q-badge {
      background: var(--primary);
      color: white;
      width: 24px;
      height: 24px;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    /* CTA */
    .cta-section {
      background: var(--secondary);
      color: white;
      text-align: center;
    }
    .cta-form {
      display: flex;
      max-width: 500px;
      margin: 32px auto 0;
      gap: 12px;
    }
    .cta-input {
      flex: 1;
      padding: 14px 18px;
      border-radius: var(--radius-input);
      border: 2px solid transparent;
      font-size: 1rem;
      transition: var(--transition);
    }
    .cta-input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 10px var(--accent-glow);
      outline: none;
    }

    /* 页脚 */
    .footer {
      background: #111;
      color: #aaa;
      padding: 50px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .back-to-top {
      position: fixed;
      bottom: 30px;
      right: 30px;
      background: var(--primary);
      color: white;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      box-shadow: 0 4px 15px rgba(255,77,0,0.4);
      transition: var(--transition);
      z-index: 999;
      border: none;
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .dashboard-panel { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .nav-dock {
        top: auto;
        bottom: 16px;
        width: 95%;
        border-radius: 36px;
        padding: 10px 24px;
      }
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .hero-grid { flex-direction: column; }
      .advantages-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr 1fr; }
      .comparison-wrapper { grid-template-columns: 1fr; }
      .dashboard-panel { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 520px) {
      .services-grid { grid-template-columns: 1fr; }
      .cta-form { flex-direction: column; }
    }