:root {
      --bg: #0a0c0f;
      --surface: #111318;
      --surface2: #1a1d24;
      --border: #252830;
      --primary: #ff4d1c;
      --secondary: #ffb347;
      --accent: #4de8b0;
      --text: #e8eaf0;
      --muted: #5a5f70;
      --body-base: #2a2f3e;
      --body-stroke: #4a5070;
  }

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

  body {
      background: var(--bg);
      color: var(--text);
      font-family: 'DM Sans', sans-serif;
      min-height: 100vh;
      overflow-x: hidden;
  }

  body::before {
      content: '';
      position: fixed;
      inset: 0;
      background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
      pointer-events: none;
      z-index: 0;
      opacity: 0.4;
  }

  header {
      position: relative;
      z-index: 10;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 18px 40px;
      border-bottom: 1px solid var(--border);
      background: rgba(10, 12, 15, 0.85);
      backdrop-filter: blur(12px);
  }

  .logo {
      font-family: 'Bebas Neue', sans-serif;
      font-size: 1.9rem;
      letter-spacing: 3px;
      display: flex;
      align-items: baseline;
      gap: 2px;
  }

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

  .logo-sub {
      font-family: 'Space Mono', monospace;
      font-size: 0.5rem;
      color: var(--muted);
      letter-spacing: 4px;
      text-transform: uppercase;
      margin-left: 10px;
      margin-bottom: 2px;
  }

  nav {
      display: flex;
      gap: 6px;
  }

  .view-btn {
      padding: 7px 16px;
      border: 1px solid var(--border);
      background: transparent;
      color: var(--muted);
      font-family: 'Space Mono', monospace;
      font-size: 0.65rem;
      letter-spacing: 2px;
      cursor: pointer;
      text-transform: uppercase;
      border-radius: 3px;
      transition: all 0.2s;
  }

  .view-btn.active,
  .view-btn:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(255, 77, 28, 0.08);
  }

  .main-layout {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: 300px 1fr 300px;
      height: calc(100vh - 65px);
  }

  /* LEFT */
  .left-panel {
      border-right: 1px solid var(--border);
      padding: 20px 16px;
      overflow-y: auto;
      display: flex;
      flex-direction: column;
      gap: 10px;
  }

  .panel-label {
      font-family: 'Space Mono', monospace;
      font-size: 0.58rem;
      letter-spacing: 4px;
      color: var(--muted);
      text-transform: uppercase;
      padding-bottom: 10px;
      border-bottom: 1px solid var(--border);
  }

  .category-title {
      font-family: 'Space Mono', monospace;
      font-size: 0.57rem;
      letter-spacing: 3px;
      color: var(--muted);
      text-transform: uppercase;
      padding: 6px 4px 2px;
  }

  .category-group {
      display: flex;
      flex-direction: column;
      gap: 3px;
  }

  .exercise-btn {
      padding: 10px 14px;
      border: 1px solid var(--border);
      background: var(--surface);
      color: var(--text);
      font-family: 'DM Sans', sans-serif;
      font-size: 0.82rem;
      cursor: pointer;
      text-align: left;
      border-radius: 5px;
      transition: all 0.18s;
      display: flex;
      align-items: center;
      gap: 9px;
  }

  .exercise-btn:hover {
      background: var(--surface2);
      transform: translateX(3px);
  }

  .exercise-btn.active {
      border-color: var(--primary);
      background: rgba(255, 77, 28, 0.1);
  }

  .exercise-btn .icon {
      width: 26px;
      height: 26px;
      border-radius: 5px;
      background: var(--surface2);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.85rem;
      flex-shrink: 0;
  }

  .exercise-btn.active .icon {
      background: rgba(255, 77, 28, 0.2);
  }

  /* CENTER */
  .center-panel {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 16px 20px;
      gap: 14px;
      background: radial-gradient(ellipse at center, #0f1219 0%, #0a0c0f 100%);
  }

  .legend {
      display: flex;
      gap: 22px;
      align-items: center;
  }

  .legend-item {
      display: flex;
      align-items: center;
      gap: 7px;
      font-family: 'Space Mono', monospace;
      font-size: 0.58rem;
      letter-spacing: 2px;
      color: var(--muted);
      text-transform: uppercase;
  }

  .legend-dot {
      width: 9px;
      height: 9px;
      border-radius: 50%;
  }

  .body-container {
      display: flex;
      gap: 36px;
      align-items: flex-start;
      justify-content: center;
  }

  .body-svg-wrap {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
  }

  .body-view-label {
      font-family: 'Space Mono', monospace;
      font-size: 0.52rem;
      letter-spacing: 3px;
      color: var(--muted);
      text-transform: uppercase;
  }

  /* SVG */
  .muscle-svg {
      width: 195px;
      height: auto;
      filter: drop-shadow(0 4px 30px rgba(0, 0, 0, 0.8));
  }

  /* Default fills — override inline colors from original SVG */
  .muscle-svg g[id] path,
  .muscle-svg g[id] rect {
      fill: var(--body-base);
      stroke: var(--body-stroke);
      stroke-width: 0.6px;
      transition: fill 0.3s ease, filter 0.3s ease;
  }

  /* Outline silhouette paths */
  .muscle-svg path#Front,
  .muscle-svg path#Back {
      fill: none !important;
      stroke: var(--body-stroke) !important;
      stroke-width: 1px;
  }

  /* PRIMARY highlight */
  .muscle-svg g.hp path,
  .muscle-svg g.hp rect {
      fill: var(--primary) !important;
      stroke: rgba(255, 77, 28, 0.5) !important;
      animation: gP 1.8s ease-in-out infinite;
  }

  /* SECONDARY highlight */
  .muscle-svg g.hs path,
  .muscle-svg g.hs rect {
      fill: var(--secondary) !important;
      stroke: rgba(255, 179, 71, 0.4) !important;
      animation: gS 1.8s ease-in-out infinite;
  }

  @keyframes gP {

      0%,
      100% {
          filter: drop-shadow(0 0 5px rgba(255, 77, 28, 0.65));
      }

      50% {
          filter: drop-shadow(0 0 13px rgba(255, 77, 28, 1));
      }
  }

  @keyframes gS {

      0%,
      100% {
          filter: drop-shadow(0 0 4px rgba(255, 179, 71, 0.5));
      }

      50% {
          filter: drop-shadow(0 0 10px rgba(255, 179, 71, 0.85));
      }
  }

  .muscle-tooltip {
      position: fixed;
      background: var(--surface2);
      border: 1px solid var(--border);
      padding: 5px 11px;
      border-radius: 4px;
      font-family: 'Space Mono', monospace;
      font-size: 0.62rem;
      color: var(--text);
      pointer-events: none;
      z-index: 1000;
      display: none;
      white-space: nowrap;
  }

  /* RIGHT */
  .right-panel {
      border-left: 1px solid var(--border);
      padding: 20px;
      overflow-y: auto;
      display: flex;
      flex-direction: column;
      gap: 15px;
  }

  .no-selection {
      text-align: center;
      color: var(--muted);
      padding: 50px 16px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
  }

  .no-selection .big-icon {
      font-size: 2.8rem;
      opacity: 0.25;
  }

  .no-selection p {
      font-size: 0.82rem;
      line-height: 1.7;
  }

  #exercise-info {
      display: none;
      flex-direction: column;
      gap: 14px;
  }

  .exercise-title {
      font-family: 'Bebas Neue', sans-serif;
      font-size: 2rem;
      letter-spacing: 2px;
      line-height: 1;
  }

  .exercise-subtitle {
      font-size: 0.78rem;
      color: var(--muted);
      margin-top: 3px;
  }

  .divider {
      height: 1px;
      background: var(--border);
  }

  .muscle-section {
      display: flex;
      flex-direction: column;
      gap: 7px;
  }

  .muscle-section-title {
      font-family: 'Space Mono', monospace;
      font-size: 0.58rem;
      letter-spacing: 3px;
      text-transform: uppercase;
      display: flex;
      align-items: center;
      gap: 7px;
  }

  .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      flex-shrink: 0;
  }

  .dot-primary {
      background: var(--primary);
      box-shadow: 0 0 5px var(--primary);
  }

  .dot-secondary {
      background: var(--secondary);
      box-shadow: 0 0 5px var(--secondary);
  }

  .muscle-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 4px;
  }

  .muscle-tag {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      padding: 5px 10px;
      border-radius: 4px;
      font-size: 0.78rem;
      font-weight: 500;
  }

  .muscle-tag-p {
      background: rgba(255, 77, 28, 0.1);
      border: 1px solid rgba(255, 77, 28, 0.28);
      color: #ff7a52;
  }

  .muscle-tag-s {
      background: rgba(255, 179, 71, 0.08);
      border: 1px solid rgba(255, 179, 71, 0.22);
      color: #ffc46a;
  }

  .stats-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 8px;
  }

  .stat-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 7px;
      padding: 12px;
  }

  .stat-label {
      font-family: 'Space Mono', monospace;
      font-size: 0.52rem;
      letter-spacing: 3px;
      color: var(--muted);
      text-transform: uppercase;
      margin-bottom: 3px;
  }

  .stat-value {
      font-family: 'Bebas Neue', sans-serif;
      font-size: 1.3rem;
      letter-spacing: 1px;
      color: var(--accent);
  }

  .tips-box {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 7px;
      padding: 14px;
  }

  .tips-title {
      font-family: 'Space Mono', monospace;
      font-size: 0.58rem;
      letter-spacing: 3px;
      color: var(--accent);
      text-transform: uppercase;
      margin-bottom: 9px;
  }

  .tip-item {
      font-size: 0.78rem;
      color: var(--muted);
      padding: 4px 0;
      border-bottom: 1px solid var(--border);
      display: flex;
      gap: 7px;
  }

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

  .tip-item::before {
      content: '→';
      color: var(--accent);
      flex-shrink: 0;
  }

  .ibar {
      height: 4px;
      border-radius: 2px;
      background: var(--border);
      overflow: hidden;
      margin-top: 5px;
  }

  .ifill {
      height: 100%;
      border-radius: 2px;
      transition: width 0.6s ease;
  }

  ::-webkit-scrollbar {
      width: 3px;
  }

  ::-webkit-scrollbar-track {
      background: var(--bg);
  }

  ::-webkit-scrollbar-thumb {
      background: var(--border);
      border-radius: 2px;
  }