/* roulang page: index */
:root {
      --sport-dark: #12151A;
      --sport-deep: #0B0E14;
      --sport-accent: #00E599;
      --sport-accent-hover: #00C885;
      --sport-accent-light: rgba(0, 229, 153, 0.12);
      --sport-muted: #5A6578;
      --sport-gray-bg: #F8FAFC;
      --sport-card-border: #E2E8F0;
      --sport-card-hover: rgba(0, 229, 153, 0.35);
      --sport-text-main: #1E293B;
      --sport-text-heading: #0F172A;
      --sport-radius: 8px;
      --sport-shadow: 0 6px 24px -4px rgba(18, 21, 26, 0.06);
      --sport-shadow-hover: 0 12px 32px -4px rgba(18, 21, 26, 0.12);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
      color: var(--sport-text-main);
      background-color: #FFFFFF;
      line-height: 1.65;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

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

    /* Top Bar */
    .top-bar {
      background-color: var(--sport-deep);
      color: #94A3B8;
      font-size: 0.85rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 6px 0;
    }

    .top-bar a {
      color: #94A3B8;
    }

    .top-bar a:hover {
      color: var(--sport-accent);
    }

    /* Main Navigation */
    .site-header {
      background-color: #FFFFFF;
      border-bottom: 1px solid var(--sport-card-border);
      position: sticky;
      top: 0;
      z-index: 1030;
      box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    }

    .nav-brand-text {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--sport-dark);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .brand-badge {
      display: inline-block;
      width: 10px;
      height: 10px;
      background-color: var(--sport-accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--sport-accent);
    }

    .nav-grid-item {
      padding: 8px 14px;
      border-radius: 6px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--sport-muted);
      display: flex;
      align-items: center;
      gap: 6px;
      transition: all 0.2s ease;
    }

    .nav-grid-item i {
      font-size: 1.1rem;
      color: #64748B;
      transition: color 0.2s;
    }

    .nav-grid-item:hover, .nav-grid-item.active {
      color: var(--sport-dark);
      background-color: var(--sport-gray-bg);
    }

    .nav-grid-item:hover i, .nav-grid-item.active i {
      color: var(--sport-accent);
    }

    /* Buttons */
    .btn-sport-primary {
      background-color: var(--sport-accent);
      color: var(--sport-deep);
      font-weight: 700;
      border: 1px solid var(--sport-accent);
      border-radius: var(--sport-radius);
      padding: 10px 22px;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .btn-sport-primary:hover {
      background-color: var(--sport-accent-hover);
      border-color: var(--sport-accent-hover);
      color: var(--sport-deep);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(0, 229, 153, 0.3);
    }

    .btn-sport-secondary {
      background-color: transparent;
      color: #FFFFFF;
      border: 1px solid rgba(255, 255, 255, 0.25);
      border-radius: var(--sport-radius);
      padding: 10px 22px;
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .btn-sport-secondary:hover {
      background-color: rgba(255, 255, 255, 0.1);
      border-color: #FFFFFF;
      color: #FFFFFF;
      transform: translateY(-2px);
    }

    .btn-sport-outline {
      background-color: transparent;
      color: var(--sport-dark);
      border: 1px solid var(--sport-card-border);
      border-radius: var(--sport-radius);
      padding: 10px 22px;
      font-weight: 600;
      transition: all 0.25s ease;
    }

    .btn-sport-outline:hover {
      background-color: var(--sport-gray-bg);
      border-color: var(--sport-muted);
      color: var(--sport-dark);
    }

    /* Section Global */
    section {
      padding: 80px 0;
      position: relative;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--sport-text-heading);
      letter-spacing: -0.5px;
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--sport-muted);
      max-width: 780px;
      margin-bottom: 48px;
    }

    .badge-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      padding: 6px 12px;
      border-radius: 4px;
      margin-bottom: 12px;
      background-color: var(--sport-accent-light);
      color: #009664;
    }

    /* Card System */
    .sport-card {
      background-color: #FFFFFF;
      border: 1px solid var(--sport-card-border);
      border-radius: var(--sport-radius);
      padding: 28px;
      box-shadow: var(--sport-shadow);
      transition: all 0.3s ease;
      height: 100%;
      display: flex;
      flex-direction: column;
    }

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

    .sport-card-icon {
      width: 52px;
      height: 52px;
      border-radius: 8px;
      background-color: var(--sport-accent-light);
      color: #00A86B;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
    }

    /* Hero Banner (Plate 1) */
    .hero-section {
      position: relative;
      background-color: var(--sport-deep);
      color: #FFFFFF;
      padding: 100px 0 120px;
      overflow: hidden;
    }

    .hero-bg-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 80% 30%, rgba(0, 229, 153, 0.15) 0%, rgba(11, 14, 20, 0.95) 75%),
                  url('/assets/images/13c814ca820adc3f.jpg') center/cover no-repeat;
      opacity: 0.65;
      z-index: 1;
    }

    .hero-container {
      position: relative;
      z-index: 2;
    }

    .hero-h1 {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 24px;
      letter-spacing: -1px;
    }

    .hero-highlight {
      color: var(--sport-accent);
      position: relative;
    }

    .hero-lead {
      font-size: 1.12rem;
      color: #CBD5E1;
      margin-bottom: 36px;
      max-width: 660px;
      line-height: 1.75;
    }

    .hero-visual-frame {
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--sport-radius);
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
      overflow: hidden;
      position: relative;
    }

    /* Fast Triple Pillars (Plate 2) */
    .pillar-strip {
      margin-top: -50px;
      position: relative;
      z-index: 10;
    }

    .pillar-card {
      background: #FFFFFF;
      border: 1px solid var(--sport-card-border);
      border-radius: var(--sport-radius);
      padding: 24px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
      display: flex;
      align-items: flex-start;
      gap: 16px;
      height: 100%;
      transition: transform 0.25s ease;
    }

    .pillar-card:hover {
      transform: translateY(-4px);
      border-color: var(--sport-accent);
    }

    .pillar-icon {
      font-size: 2rem;
      color: #00A86B;
      flex-shrink: 0;
    }

    /* Architecture / Parameters (Plate 3) */
    .bg-light-stripe {
      background-color: var(--sport-gray-bg);
    }

    .spec-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 16px;
      border-bottom: 1px solid var(--sport-card-border);
      font-size: 0.95rem;
    }

    .spec-item:last-child {
      border-bottom: none;
    }

    .spec-val {
      font-weight: 700;
      color: var(--sport-dark);
      font-family: monospace;
    }

    /* Dark Analysis Mode (Plate 6) */
    .dark-immersion-section {
      background-color: var(--sport-deep);
      color: #FFFFFF;
    }

    .dark-immersion-section .section-title {
      color: #FFFFFF;
    }

    .dark-immersion-section .section-desc {
      color: #94A3B8;
    }

    .dark-panel-card {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--sport-radius);
      padding: 30px;
    }

    .dark-panel-card.active-contrast {
      border-color: var(--sport-accent);
      background: rgba(0, 229, 153, 0.03);
    }

    /* Multi Scenario Tab System (Plate 7) */
    .nav-scenario-tabs .nav-link {
      color: var(--sport-muted);
      border: 1px solid transparent;
      border-radius: var(--sport-radius);
      padding: 12px 20px;
      font-weight: 600;
      margin-right: 8px;
    }

    .nav-scenario-tabs .nav-link.active {
      color: var(--sport-deep);
      background-color: var(--sport-accent);
      border-color: var(--sport-accent);
    }

    /* Metrics Bar (Plate 9) */
    .metric-bar-section {
      background: linear-gradient(135deg, #12151A 0%, #1A222D 100%);
      color: #FFFFFF;
      padding: 60px 0;
    }

    .metric-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--sport-accent);
      line-height: 1;
      margin-bottom: 8px;
      font-family: "DIN", -apple-system, monospace;
    }

    .metric-label {
      font-size: 0.95rem;
      color: #94A3B8;
    }

    /* FAQ Accordion (Plate 12) */
    .accordion-item {
      border: 1px solid var(--sport-card-border);
      border-radius: var(--sport-radius) !important;
      margin-bottom: 12px;
      overflow: hidden;
    }

    .accordion-button {
      font-weight: 700;
      color: var(--sport-text-heading);
      padding: 18px 24px;
      font-size: 1.05rem;
      background-color: #FFFFFF;
    }

    .accordion-button:not(.collapsed) {
      color: #007A50;
      background-color: var(--sport-accent-light);
      box-shadow: none;
    }

    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--sport-accent);
    }

    .accordion-body {
      padding: 18px 24px;
      color: var(--sport-muted);
      font-size: 0.98rem;
      line-height: 1.7;
    }

    /* Form Container (Plate 13) */
    .form-box {
      background: #FFFFFF;
      border: 1px solid var(--sport-card-border);
      border-radius: 12px;
      padding: 40px;
      box-shadow: 0 16px 40px rgba(0, 0, 0, 0.06);
    }

    .form-control, .form-select {
      border: 1px solid var(--sport-card-border);
      border-radius: var(--sport-radius);
      padding: 12px 16px;
      font-size: 0.95rem;
    }

    .form-control:focus, .form-select:focus {
      border-color: var(--sport-accent);
      box-shadow: 0 0 0 3px rgba(0, 229, 153, 0.2);
    }

    /* Footer */
    .site-footer {
      background-color: var(--sport-deep);
      color: #94A3B8;
      padding: 70px 0 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.92rem;
    }

    .footer-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 20px;
    }

    .footer-links li {
      margin-bottom: 10px;
      list-style: none;
    }

    .footer-links a:hover {
      color: var(--sport-accent);
      padding-left: 4px;
    }

    /* Floating Bar */
    .sticky-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(18, 21, 26, 0.94);
      backdrop-filter: blur(8px);
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding: 10px 0;
      z-index: 1020;
    }

    @media (max-width: 991px) {
      .hero-h1 {
        font-size: 2.2rem;
      }
      .section-title {
        font-size: 1.8rem;
      }
      .pillar-strip {
        margin-top: 20px;
      }
    }