/* simpleLens — styles */

:root {
  --bg:          #ffffff;
  --bg-soft:     #f9fafb;
  --bg-soft2:    #f3f4f6;
  --fg:          #1f2937;
  --fg-soft:     #4b5563;
  --muted:       #6b7280;
  --hairline:    #e5e7eb;
  --accent:      #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --good:        #10b981;
  --warn:        #f59e0b;
  --bad:         #ef4444;

  /* Unified type colors: all lens planes share one color, all source planes another. */
  --lens-color: #2563eb;
  --src-color:  #f59e0b;
}

html[data-theme="dark"] {
  --bg:          #0d1117;
  --bg-soft:     #161b22;
  --bg-soft2:    #1c2128;
  --fg:          #e6edf3;
  --fg-soft:     #c9d1d9;
  --muted:       #8b949e;
  --hairline:    #30363d;
  --accent:      #7bbfcc;
  --accent-soft: rgba(123, 191, 204, 0.16);
  --good:        #4ade80;
  --warn:        #fbbf24;
  --bad:         #f87171;

  --lens-color: #7bbfcc;
  --src-color:  #fbbf24;
}

/* ── Reset / base ─────────────────────────────────────────────────────────── */

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

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

/* ── App shell ────────────────────────────────────────────────────────────── */

#app {
  position: fixed;
  inset: 0;
  overflow: hidden;
}

.app-inner {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
}

/* Desktop 1.3× scale — same technique as chi-by-eye. */
@media (min-width: 721px) and (min-aspect-ratio: 1) {
  .app-inner {
    width: calc(100% / 1.3);
    height: calc(100% / 1.3);
    transform: scale(1.3);
    transform-origin: top left;
  }
}

/* ── Topbar ───────────────────────────────────────────────────────────────── */

.sl-topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  height: 44px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--hairline);
  background: var(--bg);
}

.sl-topbar h1 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fg);
  flex: 1;
}

.sl-back-btn {
  font-size: 12.5px;
  color: var(--muted);
  text-decoration: none;
  padding: 4px 10px;
  border: 1px solid var(--hairline);
  border-radius: 5px;
  background: transparent;
  cursor: pointer;
  transition: color 0.12s, border-color 0.12s;
}
.sl-back-btn:hover { color: var(--fg); border-color: var(--fg-soft); }

/* Theme button — matches parent site .dark-toggle */
.sl-theme-btn {
  background: none;
  border: none;
  padding: 5px;
  cursor: pointer;
  color: #7a8288;
  border-radius: 4px;
  line-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
/* Icon visibility driven by CSS, not JS — correct on first paint */
.icon-sun  { display: none;  }
.icon-moon { display: block; }
html[data-theme="dark"] .icon-sun  { display: block; }
html[data-theme="dark"] .icon-moon { display: none;  }
.sl-theme-btn:hover { color: #313436; background: rgba(0,0,0,0.06); }
html[data-theme="dark"] .sl-theme-btn       { color: rgba(255,255,255,0.72); }
html[data-theme="dark"] .sl-theme-btn:hover { color: #fff; background: rgba(255,255,255,0.06); }

/* ── Body (upper + timeline) ──────────────────────────────────────────────── */

.sl-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

/* ── Upper: image panel + sidebar ────────────────────────────────────────── */

.sl-upper {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 270px;
  gap: 14px;
  flex: 1;
  min-height: 0;
  padding: 12px 14px 0;
}

/* ── Image panel ─────────────────────────────────────────────────────────── */

.sl-image-wrap {
  position: relative;
  aspect-ratio: 1;
  max-height: 100%;
  min-height: 0;
  border: 1px solid var(--hairline);
  border-radius: 6px;
  overflow: hidden;
  background: #000;
  align-self: start;
}

/* WebGL canvas fills the wrapper. */
.sl-image-wrap canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* Overlay canvas for critical curves — sits on top, pointer-events off. */
.sl-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

/* Empty-state hint shown before any sources are placed. */
.sl-image-hint {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 13px;
  pointer-events: none;
}

/* Critical-curve toggle chip — top-right of the image. */
.sl-crit-toggle {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 11.5px;
  color: var(--fg-soft);
  background: var(--bg);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  padding: 3px 8px;
  cursor: pointer;
  pointer-events: auto;
  user-select: none;
  opacity: 0.85;
}
.sl-crit-toggle:hover { opacity: 1; }
.sl-crit-toggle input { accent-color: var(--accent); }

/* ── Right sidebar ────────────────────────────────────────────────────────── */

/* Default (narrow): single column, params first then settings. */
.sl-sidebar {
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
  padding-bottom: 8px;
}

.sl-params-col,
.sl-settings-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 12px;
}

/* Wide desktop: sidebar splits into two columns.
   Breakpoint at 1300px viewport (app-inner effective ~1000px).
   Params (sliders) gets more space; settings gets enough for
   long checkbox labels like "Show source/lens positions". */
@media (min-width: 1300px) and (min-aspect-ratio: 1) {
  .sl-upper {
    grid-template-columns: minmax(0, 1fr) 540px;
  }
  .sl-sidebar {
    flex-direction: row;
    align-items: flex-start;
    gap: 10px;
    overflow-y: auto;
  }
  .sl-params-col {
    flex: 4;   /* ~306px — comfortable for sliders and labels */
    min-width: 0;
    padding-bottom: 0;
  }
  .sl-settings-col {
    flex: 3;   /* ~224px — enough for all settings text on one line */
    min-width: 0;
    padding-bottom: 0;
  }
}

.sl-panel {
  border: 1px solid var(--hairline);
  border-radius: 6px;
  background: color-mix(in srgb, var(--bg-soft) 70%, transparent);
  padding: 12px;
}

.sl-panel-title-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 10px;
}

.sl-panel-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  flex: 1;
}

/* ⓘ info toggle */
.sl-info-details { position: relative; }
.sl-info-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  /* Hide the native <details> disclosure triangle */
  list-style: none;
  user-select: none;
  /* Custom circle */
  border-radius: 50%;
  border: 1px solid var(--muted);
  background: transparent;
  color: var(--muted);
  font-size: 10px;
  cursor: pointer;
  flex-shrink: 0;
}
.sl-info-btn::-webkit-details-marker { display: none; }
.sl-info-btn::marker              { display: none; }
.sl-info-btn:hover { color: var(--fg); border-color: var(--fg-soft); }
.sl-info-details[open] .sl-info-btn { color: var(--accent); border-color: var(--accent); }

.sl-info-content {
  position: absolute;
  right: 0;
  top: calc(100% + 4px);
  z-index: 20;
  width: 220px;
  padding: 9px 11px;
  background: var(--bg);
  border: 1px solid var(--hairline);
  border-radius: 6px;
  box-shadow: 0 4px 14px rgba(0,0,0,0.15);
  font-size: 11.5px;
  color: var(--fg-soft);
  line-height: 1.55;
}

/* Unit label after number inputs */
.sl-unit { font-size: 12px; color: var(--muted); }

/* Parameter rows — label (flex:1) | short slider | value */
.sl-param-row {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 7px;
}
.sl-param-row:last-child { margin-bottom: 0; }

.sl-param-label {
  font-size: 12px;
  color: var(--fg-soft);
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
}

.sl-param-row input[type="range"] {
  /* Shrinks with the panel but never below 40px or above 70px */
  flex: 0 0 clamp(40px, 22%, 70px);
  accent-color: var(--accent);
  cursor: pointer;
}

.sl-param-val {
  font-size: 11.5px;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  width: 32px;
  text-align: right;
  flex-shrink: 0;
}

/* Checkbox row inside panels */
.sl-checkbox-row {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-top: 8px;
}
.sl-checkbox-row label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--fg-soft);
  cursor: pointer;
}
.sl-checkbox-row input[type="checkbox"] { accent-color: var(--accent); }

.sl-perf-note {
  margin-bottom: 8px;
  font-size: 11px;
  color: var(--muted);
  line-height: 1.45;
  font-style: italic;
}

.sl-select {
  width: 100%;
  padding: 5px 8px;
  border: 1px solid var(--hairline);
  border-radius: 4px;
  background: var(--bg);
  color: var(--fg);
  font-size: 12.5px;
  cursor: pointer;
  margin-bottom: 10px;
}

/* Empty-selection message in sidebar. */
.sl-empty-msg {
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.6;
}

/* Global controls (FOV, z_max). */
.sl-global-input {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--fg-soft);
  margin-bottom: 8px;
}
.sl-global-input:last-child { margin-bottom: 0; }
.sl-global-input label { min-width: 62px; flex-shrink: 0; }
.sl-global-input select {
  flex: 1;
  min-width: 0;
  max-width: 100%;
  font-size: 12px;
  padding: 2px 4px;
  border: 1px solid var(--hairline);
  border-radius: 4px;
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
}
.sl-global-input input[type="number"] {
  width: 72px;
  padding: 4px 7px;
  border: 1px solid var(--hairline);
  border-radius: 4px;
  background: var(--bg);
  color: var(--fg);
  font-size: 12.5px;
}

/* ── Timeline panel ───────────────────────────────────────────────────────── */

.sl-timeline {
  display: flex;
  flex-direction: row;
  flex-shrink: 0;
  height: 190px;
  border-top: 1px solid var(--hairline);
  margin-top: 10px;
  background: var(--bg-soft);
  overflow: hidden;
}

/* Clickable z-axis strip. */
.sl-axis-wrap {
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  width: 220px;
  border-right: 1px solid var(--hairline);
  padding: 8px 0 0;
  position: relative;
  background: var(--bg);
}

.sl-axis-label {
  font-size: 11px;
  color: var(--muted);
  text-align: center;
  margin-bottom: 4px;
  letter-spacing: 0.05em;
}

.sl-axis-canvas {
  flex: 1;
  width: 100%;
  cursor: crosshair;
  display: block;
}

/* Scrollable plane-box area. */
.sl-planes {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 10px;
  flex: 1;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 8px 12px;
}

/* Individual plane box. */
.sl-plane-box {
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  width: 152px;
  border: 2px solid var(--plane-color, var(--hairline));
  border-radius: 6px;
  background: var(--bg);
  overflow: hidden;
}

.sl-plane-header {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 6px;
  border-bottom: 1px solid var(--hairline);
  background: var(--bg-soft);
}

/* Compact z label in plane header */
.sl-plane-z {
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--fg-soft);
  flex: 1;
  white-space: nowrap;
}

/* Plane type toggle buttons */
.sl-plane-type-btn {
  font-size: 10.5px;
  padding: 1px 6px;
  border: 1px solid var(--hairline);
  border-radius: 3px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.1s, color 0.1s;
}
/* Active state uses type-based color from --plane-color set inline */
.sl-plane-type-btn.active {
  background: var(--plane-color, var(--accent));
  border-color: var(--plane-color, var(--accent));
  color: #fff;
}

/* Type-based border color on the plane box */
.sl-plane-box[data-type="lens"]   { border-color: var(--lens-color); }
.sl-plane-box[data-type="source"] { border-color: var(--src-color);  }

.sl-plane-del {
  font-size: 13px;
  line-height: 1;
  padding: 1px 4px;
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}
.sl-plane-del:hover { color: var(--bad); }

.sl-axis-canvas  { cursor: crosshair; }
.sl-plane-canvas {
  display: block;
  width: 148px;
  height: 148px;
  cursor: crosshair;
  cursor: crosshair;
}
.sl-plane-canvas.has-selected { cursor: grab; }

/* Empty timeline prompt. */
.sl-timeline-hint {
  padding: 8px 16px;
  font-size: 12.5px;
  color: var(--muted);
  align-self: center;
}

/* ── Mobile ───────────────────────────────────────────────────────────────── */

@media (max-aspect-ratio: 1/1), (max-width: 720px) {
  .sl-upper {
    grid-template-columns: 1fr;
    padding: 10px 10px 0;
  }

  .sl-timeline {
    height: 170px;
  }

  .sl-axis-wrap {
    width: 160px;
  }
}