/* ─── DESIGN TOKENS ─────────────────────────────────────────────── */
    :root {
      --sea-deep:    #040d1a;
      --sea-mid:     #071428;
      --sea-surface: #0c1f3f;
      --sea-lit:     #102a52;
      --horizon:     #153462;

      --brine:       #1a4a7a;
      --wake:        #2462a0;
      --foam:        #3d85c8;
      --spray:       #6aaee0;
      --sky:         #a8d4f5;

      --signal-red:  #e8334a;
      --signal-grn:  #2ec87a;
      --signal-ylw:  #f0c040;
      --signal-blu:  #3d85c8;

      --text-bright: #e8f4ff;
      --text-mid:    #8bb8e0;
      --text-dim:    #426080;
      --text-ghost:  #1d3a58;

      --panel-bg:    rgba(4, 13, 26, 0.96);
      --panel-border: rgba(61, 133, 200, 0.25);
      --panel-glow:  rgba(61, 133, 200, 0.08);

      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 14px;

      --font-display: 'Rajdhani', sans-serif;
      --font-mono:    'Source Code Pro', monospace;

      --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    }

    /* ─── RESET ────────────────────────────────────────────────────── */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html, body { width: 100%; height: 100%; overflow: hidden; background: var(--sea-deep); }

    body {
      font-family: var(--font-mono);
      color: var(--text-bright);
    }

    /* ─── MAP CONTAINER ─────────────────────────────────────────────── */
    #map {
      position: absolute;
      inset: 0;
      z-index: 1;
      background: var(--sea-deep);
    }

    /* ─── HUD STRIP (top) ───────────────────────────────────────────── */
    #hud {
      position: absolute;
      top: 0; left: 0; right: 0;
      z-index: 20;
      display: flex;
      align-items: center;
      gap: 0;
      background: linear-gradient(180deg, rgba(4,13,26,0.95) 0%, rgba(4,13,26,0.0) 100%);
      padding: 10px 14px 24px;
      pointer-events: none;
    }

    #hud-logo {
      font-family: var(--font-display);
      font-weight: 800;
      font-size: 17px;
      letter-spacing: 0.12em;
      color: var(--text-bright);
      text-transform: uppercase;
      pointer-events: none;
      flex-shrink: 0;
    }
    #hud-logo span { color: var(--foam); }

    #hud-spacer { flex: 1; }

    #hud-status {
      font-size: 11px;
      color: var(--text-mid);
      letter-spacing: 0.06em;
      text-align: right;
      pointer-events: none;
      line-height: 1.5;
    }
    #hud-status .val { color: var(--text-bright); font-weight: 600; }
    #hud-status .label { color: var(--text-bright); }

    @keyframes popPulse {
      from { opacity: 0.8; transform: translate(-50%, -50%) scale(0.97); }
      to   { opacity: 1.0; transform: translate(-50%, -50%) scale(1.03); }
    }

    /* ─── MESSAGE BAR (bottom) ──────────────────────────────────────── */
    #msg-bar {
      position: absolute;
      bottom: 0; left: 0; right: 0;
      z-index: 20;
      padding: 12px 14px 14px;
      background: linear-gradient(0deg, rgba(4,13,26,0.95) 0%, rgba(4,13,26,0.0) 100%);
      pointer-events: none;
    }

    #msg {
      font-family: var(--font-mono);
      font-size: 11px;
      color: var(--text-bright);
      letter-spacing: 0.04em;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
    #msg .prefix { color: var(--foam); }

    /* ─── CONTROL TOOLBAR ───────────────────────────────────────────── */
    #toolbar {
      position: absolute;
      left: 12px;
      top: 50%;
      transform: translateY(-50%);
      z-index: 30;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .tool-btn {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-md);
      border: 1px solid var(--panel-border);
      background: var(--panel-bg);
      color: var(--text-mid);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
      font-size: 18px;
      user-select: none;
      -webkit-tap-highlight-color: transparent;
      position: relative;
    }
    .tool-btn:hover, .tool-btn:active {
      background: var(--brine);
      color: var(--text-bright);
      border-color: var(--foam);
      box-shadow: 0 0 12px rgba(61,133,200,0.3);
    }
    .tool-btn.active {
      background: var(--signal-red);
      border-color: var(--signal-red);
      color: #fff;
      box-shadow: 0 0 14px rgba(232,51,74,0.5);
    }
    .tool-btn.armed {
      border-color: var(--signal-ylw);
      color: var(--signal-ylw);
    }

    .tool-divider {
      height: 1px;
      background: var(--panel-border);
      margin: 2px 4px;
    }

    .tool-btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

    /* ─── PANEL (side drawer) ───────────────────────────────────────── */
    #panel-overlay {
      position: absolute;
      inset: 0;
      z-index: 100;
      background: rgba(4,13,26,0.7);
      backdrop-filter: blur(4px);
      opacity: 0;
      pointer-events: none;
      transition: opacity var(--transition);
    }
    #panel-overlay.open {
      opacity: 1;
      pointer-events: all;
    }

    #panel {
      position: absolute;
      top: 0; right: 0; bottom: 0;
      width: min(360px, 100vw);
      z-index: 101;
      background: var(--panel-bg);
      border-left: 1px solid var(--panel-border);
      display: flex;
      flex-direction: column;
      transform: translateX(100%);
      transition: transform 320ms cubic-bezier(0.4, 0, 0.2, 1);
      overflow: hidden;
    }
    #panel.open {
      transform: translateX(0);
    }

    #panel-header {
      display: flex;
      align-items: center;
      padding: 16px 18px;
      border-bottom: 1px solid var(--panel-border);
      flex-shrink: 0;
      gap: 10px;
    }
    #panel-title {
      font-family: var(--font-display);
      font-weight: 700;
      font-size: 15px;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      color: var(--text-bright);
      flex: 1;
    }
    #panel-close {
      width: 30px;
      height: 30px;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      border-radius: var(--radius-sm);
      color: var(--text-dim);
      transition: color var(--transition);
    }
    #panel-close:hover { color: var(--text-bright); }
    #panel-close svg { width: 18px; height: 18px; }

    #panel-tabs {
      display: flex;
      border-bottom: 1px solid var(--panel-border);
      flex-shrink: 0;
    }
    .ptab {
      flex: 1;
      padding: 10px 0;
      font-family: var(--font-display);
      font-size: 10px;
      font-weight: 700;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--text-dim);
      text-align: center;
      cursor: pointer;
      border-bottom: 2px solid transparent;
      transition: color var(--transition), border-color var(--transition);
      user-select: none;
    }
    .ptab.active {
      color: var(--foam);
      border-bottom-color: var(--foam);
    }

    #panel-body {
      flex: 1;
      overflow-y: auto;
      overflow-x: hidden;
      -webkit-overflow-scrolling: touch;
    }
    #panel-body::-webkit-scrollbar { width: 4px; }
    #panel-body::-webkit-scrollbar-track { background: transparent; }
    #panel-body::-webkit-scrollbar-thumb { background: var(--brine); border-radius: 2px; }

    .tab-pane { display: none; padding: 16px; }
    .tab-pane.active { display: block; }

    /* ─── PANEL COMPONENTS ──────────────────────────────────────────── */
    .section-label {
      font-family: var(--font-display);
      font-size: 10px;
      font-weight: 700;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--text-dim);
      margin-bottom: 8px;
      margin-top: 18px;
      padding-left: 2px;
    }
    .section-label:first-child { margin-top: 0; }

    .field {
      margin-bottom: 10px;
    }
    .field label {
      display: block;
      font-size: 10px;
      color: var(--text-dim);
      letter-spacing: 0.08em;
      text-transform: uppercase;
      margin-bottom: 5px;
    }

    input[type="text"], select {
      width: 100%;
      background: rgba(7,20,40,0.8);
      border: 1px solid var(--panel-border);
      border-radius: var(--radius-sm);
      color: var(--text-bright);
      font-family: var(--font-mono);
      font-size: 12px;
      padding: 9px 11px;
      outline: none;
      transition: border-color var(--transition), box-shadow var(--transition);
      -webkit-appearance: none;
    }
    input[type="text"]:focus, select:focus {
      border-color: var(--foam);
      box-shadow: 0 0 0 2px rgba(61,133,200,0.15);
    }
    select {
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23426080' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
      background-repeat: no-repeat;
      background-position: right 10px center;
      padding-right: 28px;
      cursor: pointer;
    }
    select option { background: var(--sea-mid); }

    .btn {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      padding: 9px 14px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--panel-border);
      background: var(--sea-lit);
      color: var(--text-mid);
      font-family: var(--font-display);
      font-size: 11px;
      font-weight: 700;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      cursor: pointer;
      transition: all var(--transition);
      user-select: none;
    }
    .btn:hover {
      background: var(--brine);
      color: var(--text-bright);
      border-color: var(--foam);
    }
    .btn svg { width: 14px; height: 14px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
    .btn-primary {
      background: var(--wake);
      border-color: var(--foam);
      color: var(--text-bright);
    }
    .btn-primary:hover { background: var(--foam); }
    .btn-danger {
      background: rgba(232,51,74,0.15);
      border-color: rgba(232,51,74,0.4);
      color: var(--signal-red);
    }
    .btn-danger:hover { background: rgba(232,51,74,0.3); }
    .btn-full { width: 100%; justify-content: center; }

    /* ─── LOG PANEL ─────────────────────────────────────────────────── */
    #log-output {
      font-family: var(--font-mono);
      font-size: 10px;
      color: var(--text-dim);
      line-height: 1.7;
      white-space: pre-wrap;
      word-break: break-all;
    }
    #log-output .log-new { color: var(--text-mid); }
    #log-output .log-warn { color: var(--signal-ylw); }
    #log-output .log-err { color: var(--signal-red); }

    /* ─── RACE INFO CARD ─────────────────────────────────────────────── */
    #race-card {
      position: absolute;
      right: 12px;
      top: 52px;
      z-index: 20;
      width: 160px;
      background: var(--panel-bg);
      border: 1px solid var(--panel-border);
      border-radius: var(--radius-lg);
      padding: 12px 14px;
      pointer-events: none;
      opacity: 0;
      transform: translateX(8px);
      transition: opacity var(--transition), transform var(--transition);
    }
    #race-card.visible {
      opacity: 1;
      transform: translateX(0);
    }
    .rc-label {
      font-size: 9px;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      color: var(--text-dim);
      margin-bottom: 2px;
    }
    .rc-value {
      font-family: var(--font-display);
      font-size: 18px;
      font-weight: 700;
      color: var(--text-bright);
      line-height: 1;
      margin-bottom: 10px;
    }
    .rc-value:last-child { margin-bottom: 0; }
    .rc-value.green { color: var(--signal-grn); }
    .rc-value.yellow { color: var(--signal-ylw); }
    .rc-value.red { color: var(--signal-red); }

    /* ─── COUNTDOWN STRIP (top, when race imminent) ─────────────────── */
    #countdown-strip {
      position: absolute;
      top: 52px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 20;
      background: var(--panel-bg);
      border: 1px solid var(--panel-border);
      border-radius: var(--radius-lg);
      padding: 8px 18px;
      pointer-events: none;
      opacity: 0;
      transition: opacity var(--transition);
      white-space: nowrap;
      min-width: 96px;
    }
    #countdown-strip.visible { opacity: 0.8; }
    #countdown-strip .cnt-time {
      font-family: var(--font-display);
      font-weight: 800;
      font-size: 28px;
      color: var(--signal-ylw);
      text-align: center;
      letter-spacing: 0.04em;
      text-shadow: 0 0 20px rgba(240,192,64,0.4);
      font-variant-numeric: tabular-nums;
    }
    #countdown-strip .cnt-tts {
      font-family: var(--font-display);
      font-weight: 800;
      font-size: 28px;
      color: var(--signal-ylw);
      text-align: center;
      letter-spacing: 0.04em;
      text-shadow: 0 0 20px rgba(240,192,64,0.4);
      font-variant-numeric: tabular-nums;
    }
    #countdown-strip .cnt-tts.slow {
      color: var(--signal-grn);
    }
    #countdown-strip .cnt-tts.fast {
      color: var(--signal-red);
    }
    #countdown-strip .cnt-label {
      font-size: 9px;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--text-dim);
      text-align: center;
    }

    /* ─── LEAFLET OVERRIDES ──────────────────────────────────────────── */
    .leaflet-control-zoom,
    .leaflet-control-attribution { display: none !important; }

    .leaflet-popup-content-wrapper {
      background: var(--panel-bg);
      border: 1px solid var(--panel-border);
      border-radius: var(--radius-md);
      color: var(--text-bright);
      font-family: var(--font-mono);
      font-size: 12px;
      box-shadow: 0 4px 24px rgba(0,0,0,0.6);
    }
    .leaflet-popup-tip-container { display: none; }
    .leaflet-popup-close-button {
      color: var(--text-dim) !important;
    }

    /* ─── LOADING SCREEN ─────────────────────────────────────────────── */
    #loader {
      position: absolute;
      inset: 0;
      z-index: 200;
      background: var(--sea-deep);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 16px;
      transition: opacity 600ms ease;
    }
    #loader.fade-out { opacity: 0; pointer-events: none; }
    #loader-logo {
      font-family: var(--font-display);
      font-size: 32px;
      font-weight: 800;
      letter-spacing: 0.16em;
      text-transform: uppercase;
      color: var(--text-bright);
    }
    #loader-logo span { color: var(--foam); }
    #loader-sub {
      font-size: 11px;
      color: var(--text-dim);
      letter-spacing: 0.12em;
      text-transform: uppercase;
    }
    .loader-ring {
      width: 36px;
      height: 36px;
      border: 2px solid var(--text-ghost);
      border-top-color: var(--foam);
      border-radius: 50%;
      animation: spin 800ms linear infinite;
    }
    @keyframes spin { to { transform: rotate(360deg); } }

    /* ─── TOAST ──────────────────────────────────────────────────────── */
    #toast {
      position: absolute;
      bottom: 36px;
      left: 50%;
      transform: translateX(-50%) translateY(20px);
      z-index: 150;
      background: var(--brine);
      border: 1px solid var(--foam);
      border-radius: var(--radius-md);
      padding: 9px 16px;
      font-size: 12px;
      color: var(--text-bright);
      letter-spacing: 0.04em;
      white-space: nowrap;
      opacity: 0;
      pointer-events: none;
      transition: opacity 250ms ease, transform 250ms ease;
    }
    #toast.show {
      opacity: 1;
      transform: translateX(-50%) translateY(0);
    }

    /* ─── TRACK SPEED LEGEND ─────────────────────────────────────────── */
    #speed-legend {
      position: absolute;
      bottom: 36px;
      right: 12px;
      z-index: 20;
      background: var(--panel-bg);
      border: 1px solid var(--panel-border);
      border-radius: var(--radius-md);
      padding: 8px 10px;
      pointer-events: none;
      opacity: 0.8;
    }
    #speed-legend.hide { opacity: 0; }
    .speed-row {
      display: flex;
      align-items: center;
      gap: 6px;
      margin-bottom: 4px;
      font-size: 9px;
      color: var(--text-dim);
      letter-spacing: 0.05em;
    }
    .speed-row:last-child { margin-bottom: 0; }
    .speed-dot {
      width: 8px; height: 8px;
      border-radius: 50%;
      flex-shrink: 0;
    }

    /* ─── REPLAY BAR ─────────────────────────────────────────────────── */
    #replay-bar {
      position: absolute;
      bottom: 32px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 30;
      width: min(480px, calc(100vw - 80px));
      background: var(--panel-bg);
      border: 1px solid var(--panel-border);
      border-radius: var(--radius-lg);
      padding: 10px 14px 12px;
      display: none;
      flex-direction: column;
      gap: 8px;
      box-shadow: 0 4px 24px rgba(0,0,0,0.5);
    }
    #replay-bar.visible { display: flex; }

    #replay-top {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .replay-btn {
      width: 32px; height: 32px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--panel-border);
      background: var(--sea-lit);
      color: var(--text-mid);
      display: flex; align-items: center; justify-content: center;
      cursor: pointer;
      flex-shrink: 0;
      transition: background var(--transition), color var(--transition), border-color var(--transition);
      -webkit-tap-highlight-color: transparent;
    }
    .replay-btn:hover, .replay-btn.active {
      background: var(--wake);
      color: var(--text-bright);
      border-color: var(--foam);
    }
    .replay-btn svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

    #replay-time {
      font-family: var(--font-mono);
      font-size: 12px;
      color: var(--text-bright);
      min-width: 72px;
      text-align: center;
      flex-shrink: 0;
    }

    #replay-speed-btns {
      display: flex;
      gap: 4px;
      margin-left: auto;
      flex-shrink: 0;
    }
    .spd-btn {
      padding: 3px 8px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--panel-border);
      background: var(--sea-lit);
      color: var(--text-dim);
      font-family: var(--font-mono);
      font-size: 10px;
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition);
      -webkit-tap-highlight-color: transparent;
    }
    .spd-btn:hover { color: var(--text-bright); border-color: var(--foam); }
    .spd-btn.active {
      background: var(--wake);
      border-color: var(--foam);
      color: var(--text-bright);
    }

    #replay-scrub {
      -webkit-appearance: none;
      appearance: none;
      width: 100%;
      height: 4px;
      border-radius: 2px;
      background: var(--sea-lit);
      outline: none;
      cursor: pointer;
    }
    #replay-scrub::-webkit-slider-thumb {
      -webkit-appearance: none;
      width: 14px; height: 14px;
      border-radius: 50%;
      background: var(--foam);
      cursor: pointer;
      box-shadow: 0 0 6px rgba(61,133,200,0.5);
    }
    #replay-scrub::-moz-range-thumb {
      width: 14px; height: 14px;
      border-radius: 50%;
      background: var(--foam);
      border: none;
      cursor: pointer;
    }

    #replay-ghost {
      position: absolute;
      z-index: 25;
      pointer-events: none;
    }

    /* ─── RESPONSIVE ─────────────────────────────────────────────────── */
    @media (max-width: 480px) {
      #toolbar { gap: 5px; }
      .tool-btn { width: 40px; height: 40px; font-size: 16px; }
      #race-card { width: 140px; padding: 10px 12px; }
      .rc-value { font-size: 15px; }
    }