/* ═══════════════════════════════════════════════════
   Wind Tunnel Simulator — DroneMaster Edition
   Version: 2.1.0
   ═══════════════════════════════════════════════════ */

/* -- Variables: Dark theme (default) -- */
#wts-root.wts-theme-dark {
  --wts-bg:          #0d1117;
  --wts-panel-bg:    #111827;
  --wts-surface:     #1a2230;
  --wts-border:      rgba(255,255,255,0.08);
  --wts-text:        #e2e8f0;
  --wts-text-muted:  #64748b;
  --wts-accent:      #38bdf8;
  --wts-accent2:     #f97316;
  --wts-label:       #94a3b8;
  --wts-card-bg:     #151d2a;
  --wts-input-bg:    #0d1117;
  --wts-btn:         #1e3a5f;
  --wts-btn-hover:   #1e4976;
  --wts-run:         #cc0000;
  --wts-run-text:    #fff;
  --wts-craft-act:   #38bdf8;
  --wts-stall:       #ef4444;
  --wts-canvas-bg:   #080d14;
  --wts-grid:        rgba(255,255,255,0.03);
  --wts-header-bg:   #1B3A6B;
  --wts-header-border: rgba(255,255,255,0.12);
}

/* -- Variables: Light theme -- */
#wts-root.wts-theme-light {
  --wts-bg:          #f0f4f8;
  --wts-panel-bg:    #ffffff;
  --wts-surface:     #e8eef5;
  --wts-border:      rgba(0,0,0,0.10);
  --wts-text:        #1e293b;
  --wts-text-muted:  #64748b;
  --wts-accent:      #0369a1;
  --wts-accent2:     #ea580c;
  --wts-label:       #475569;
  --wts-card-bg:     #ffffff;
  --wts-input-bg:    #f8fafc;
  --wts-btn:         #e0edf8;
  --wts-btn-hover:   #bfdbf7;
  --wts-run:         #cc0000;
  --wts-run-text:    #fff;
  --wts-craft-act:   #0369a1;
  --wts-stall:       #dc2626;
  --wts-canvas-bg:   #1a2535;
  --wts-grid:        rgba(255,255,255,0.04);
  --wts-header-bg:   #1B3A6B;
  --wts-header-border: rgba(255,255,255,0.12);
}

/* ── Reset & base ── */
#wts-root *,
#wts-root *::before,
#wts-root *::after { box-sizing: border-box; }

#wts-root {
  font-family: 'DM Mono', 'Fira Code', 'Courier New', monospace;
  background: var(--wts-bg);
  color: var(--wts-text);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--wts-border);
}

/* ── Header ── */
.wts-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--wts-header-bg);
  border-bottom: 1px solid var(--wts-header-border);
  gap: 12px;
}
.wts-header-left { display: flex; align-items: center; gap: 10px; }
.wts-dm-logo {
  width: 38px;
  height: 38px;
  border-radius: 6px;
  flex-shrink: 0;
  object-fit: contain;
}
.wts-title-block {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.wts-title {
  font-family: 'Rajdhani', Arial, sans-serif;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #ffffff;
  text-transform: uppercase;
  line-height: 1;
}
.wts-subtitle {
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.10em;
  color: rgba(255,255,255,0.60);
  text-transform: uppercase;
}
.wts-header-right { display: flex; align-items: center; gap: 8px; }
.wts-badge {
  font-size: 11px;
  padding: 3px 9px;
  border-radius: 4px;
  background: var(--wts-surface);
  border: 1px solid var(--wts-border);
  color: var(--wts-accent);
  font-family: inherit;
  letter-spacing: 0.05em;
}
.wts-badge-re { color: var(--wts-accent2); }
.wts-btn-icon {
  background: none;
  border: 1px solid var(--wts-border);
  color: var(--wts-text-muted);
  border-radius: 6px;
  width: 30px; height: 30px;
  cursor: pointer;
  font-size: 14px;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.15s;
}
.wts-btn-icon:hover { background: var(--wts-surface); }

/* ── Body layout ── */
.wts-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ── Left spec panel ── */
.wts-spec-panel {
  width: 260px;
  min-width: 220px;
  background: #0f1e3a;
  border-right: 1px solid rgba(27,58,107,0.8);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
/* Navy accent stripe at top of panel */
.wts-spec-panel::before {
  content: '';
  display: block;
  height: 3px;
  background: linear-gradient(90deg, #1B3A6B, #38bdf8, #cc0000);
  flex-shrink: 0;
}
.wts-panel-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 12px 14px 20px;
  scrollbar-width: thin;
  scrollbar-color: var(--wts-border) transparent;
}
.wts-panel-scroll::-webkit-scrollbar { width: 4px; }
.wts-panel-scroll::-webkit-scrollbar-thumb { background: var(--wts-border); border-radius: 2px; }

/* ── Section labels ── */
.wts-section-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--wts-text-muted);
  margin: 14px 0 8px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--wts-border);
}

/* ── Craft grid ── */
.wts-craft-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 5px;
  margin-bottom: 4px;
}
.wts-craft-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 7px 4px;
  border: 1px solid var(--wts-border);
  background: var(--wts-input-bg);
  color: var(--wts-text-muted);
  border-radius: 7px;
  cursor: pointer;
  font-family: inherit;
  font-size: 10px;
  transition: all 0.15s;
}
.wts-craft-btn:hover { background: var(--wts-surface); color: var(--wts-text); }
.wts-craft-btn.active {
  background: var(--wts-btn);
  border-color: var(--wts-craft-act);
  color: var(--wts-accent);
}
.wts-craft-icon { font-size: 15px; }

/* Drone icon — rendered as a small SVG-like shape using CSS */
.wts-drone-icon {
  font-size: 13px;
  position: relative;
  display: inline-block;
}

/* ── Field groups ── */
.wts-field-group {
  margin-bottom: 10px;
}
.wts-label {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--wts-label);
  margin-bottom: 4px;
}
.wts-unit-label {
  color: var(--wts-accent);
  font-size: 10px;
}
.wts-input {
  width: 100%;
  background: var(--wts-input-bg);
  border: 1px solid var(--wts-border);
  border-radius: 6px;
  color: var(--wts-text);
  font-family: inherit;
  font-size: 12px;
  padding: 5px 8px;
  margin-bottom: 3px;
  transition: border-color 0.15s;
  -moz-appearance: textfield;
}
.wts-input::-webkit-inner-spin-button,
.wts-input::-webkit-outer-spin-button { opacity: 0.4; }
.wts-input:focus { outline: none; border-color: var(--wts-accent); }

.wts-slider {
  width: 100%;
  height: 3px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--wts-border);
  border-radius: 2px;
  cursor: pointer;
}
.wts-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--wts-accent);
  border: 2px solid var(--wts-panel-bg);
}
.wts-slider::-moz-range-thumb {
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--wts-accent);
  border: 2px solid var(--wts-panel-bg);
}

/* ── Run button ── */
.wts-run-btn {
  width: 100%;
  margin-top: 16px;
  padding: 10px;
  background: #cc0000;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-family: 'Rajdhani', inherit;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
}
.wts-run-btn:hover { opacity: 0.88; }
.wts-run-btn:active { transform: scale(0.97); }

/* Panel brand watermark */
.wts-panel-brand {
  text-align: center;
  font-size: 9px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.18);
  padding: 8px 0 4px;
  font-family: 'Rajdhani', Arial, sans-serif;
}

/* ── Canvas area ── */
.wts-canvas-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--wts-bg);
}
.wts-canvas-wrap {
  flex: 1;
  position: relative;
  background: var(--wts-canvas-bg);
  overflow: hidden;
}
#wts-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* ── HUD overlay ── */
.wts-overlay-hud {
  position: absolute;
  top: 10px; left: 10px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  pointer-events: none;
}
.wts-hud-row { display: flex; gap: 6px; }
.wts-hud-pill {
  font-size: 11px;
  font-family: 'DM Mono', monospace;
  background: rgba(0,0,0,0.6);
  color: #e2e8f0;
  padding: 3px 9px;
  border-radius: 4px;
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255,255,255,0.08);
}
.wts-stall-pill {
  background: rgba(239,68,68,0.85);
  color: #fff;
  animation: wts-pulse 0.6s ease-in-out infinite alternate;
}
@keyframes wts-pulse { from { opacity:0.8; } to { opacity:1; } }

/* ── Pressure legend ── */
.wts-pressure-legend {
  position: absolute;
  bottom: 10px; right: 10px;
  width: 120px;
  pointer-events: none;
}
.wts-legend-bar {
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(to right, #3b82f6, #6ee7b7, #f97316, #ef4444);
  margin-bottom: 3px;
}
.wts-legend-labels {
  display: flex;
  justify-content: space-between;
  font-size: 9px;
  color: rgba(255,255,255,0.45);
}

/* ── Readout cards ── */
.wts-readouts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 8px;
  padding: 10px;
  background: var(--wts-bg);
  border-top: 1px solid var(--wts-border);
}
.wts-readout-card {
  background: var(--wts-card-bg);
  border: 1px solid var(--wts-border);
  border-radius: 8px;
  padding: 8px 10px;
}
.wts-readout-label {
  font-size: 10px;
  color: var(--wts-text-muted);
  margin-bottom: 3px;
}
.wts-readout-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--wts-accent);
  line-height: 1.2;
}
.wts-readout-value small {
  font-size: 10px;
  color: var(--wts-text-muted);
  font-weight: 400;
}

/* ── Responsive ── */
@media (max-width: 700px) {
  .wts-body { flex-direction: column; }
  .wts-spec-panel { width: 100%; border-right: none; border-bottom: 1px solid var(--wts-border); max-height: 340px; }
  .wts-readouts { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 480px) {
  .wts-readouts { grid-template-columns: repeat(2, 1fr); }
}

/* ═══ WIND DYNAMICS EXPLAINER ═══════════════════════════════════ */
.wts-explainer {
  border-top: 1px solid var(--wts-border);
  background: var(--wts-bg);
  padding: 18px 18px 24px;
}
.wts-explainer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  flex-wrap: wrap;
  gap: 8px;
}
.wts-explainer-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--wts-text);
}
.wts-doc-link {
  font-size: 12px;
  color: var(--wts-accent);
  text-decoration: none;
  border: 1px solid var(--wts-border);
  border-radius: 6px;
  padding: 5px 12px;
  transition: background 0.15s;
}
.wts-doc-link:hover { background: var(--wts-surface); }

/* Live charts */
.wts-chart-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
.wts-chart-block {
  background: var(--wts-panel-bg);
  border: 1px solid var(--wts-border);
  border-radius: 8px;
  padding: 10px 12px 8px;
}
.wts-chart-label {
  font-size: 10px;
  color: var(--wts-text-muted);
  margin-bottom: 6px;
  letter-spacing: 0.04em;
}

/* Four-forces prose cards */
.wts-prose-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 14px;
}
.wts-prose-card {
  background: var(--wts-panel-bg);
  border: 1px solid var(--wts-border);
  border-radius: 8px;
  padding: 12px;
}
.wts-prose-icon {
  font-size: 20px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin-bottom: 8px;
}
.wts-icon-lift  { background: rgba(34,197,94,0.15); color: #4ade80; }
.wts-icon-drag  { background: rgba(239,68,68,0.15);  color: #f87171; }
.wts-icon-aoa   { background: rgba(251,191,36,0.15); color: #fbbf24; }
.wts-icon-re    { background: rgba(56,189,248,0.15); color: var(--wts-accent); }
.wts-prose-heading {
  font-size: 12px;
  font-weight: 700;
  color: var(--wts-text);
  margin-bottom: 5px;
}
.wts-prose-body {
  font-size: 11px;
  color: var(--wts-text-muted);
  line-height: 1.55;
}

/* Accuracy stats bar */
.wts-accuracy-bar {
  display: flex;
  align-items: center;
  background: var(--wts-surface);
  border: 1px solid var(--wts-border);
  border-radius: 8px;
  padding: 10px 16px;
  margin-bottom: 14px;
  flex-wrap: wrap;
  gap: 8px;
}
.wts-accuracy-item { display: flex; flex-direction: column; align-items: center; flex: 1; min-width: 70px; }
.wts-accuracy-stat { font-size: 16px; font-weight: 700; color: var(--wts-accent); font-family: var(--wts-font, monospace); }
.wts-accuracy-desc { font-size: 10px; color: var(--wts-text-muted); text-align: center; }
.wts-accuracy-divider { width: 1px; height: 32px; background: var(--wts-border); flex-shrink: 0; }

/* Resource link strip */
.wts-resource-strip {
  background: var(--wts-panel-bg);
  border: 1px solid var(--wts-border);
  border-radius: 8px;
  padding: 12px 14px;
}
.wts-resource-title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--wts-text-muted);
  margin-bottom: 10px;
}
.wts-resource-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 8px;
}
.wts-resource-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: var(--wts-input-bg);
  border: 1px solid var(--wts-border);
  border-radius: 7px;
  padding: 8px 10px;
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
}
.wts-resource-link:hover { border-color: var(--wts-accent); background: var(--wts-btn); }
.wts-resource-link-name { font-size: 11px; font-weight: 700; color: var(--wts-accent); }
.wts-resource-link-desc { font-size: 10px; color: var(--wts-text-muted); }

/* ── Responsive explainer ── */
@media (max-width: 900px) {
  .wts-chart-row { grid-template-columns: 1fr 1fr; }
  .wts-prose-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .wts-chart-row { grid-template-columns: 1fr; }
  .wts-prose-grid { grid-template-columns: 1fr 1fr; }
  .wts-accuracy-divider { display: none; }
}