/* ================================================================
   SIM HUD — Unified design system for simulation control panels
   Project: 3D Browser Simulations
   Usage:   <link rel="stylesheet" href="../shared/sim-hud.css">
   Depends: shared/theme.css (for CSS variables — optional but
            recommended; fallbacks are provided for standalone use)
   ================================================================ */

/* ── Top control bar (.sim-bar) ───────────────────────────────── */
.sim-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  background: rgba(8, 9, 14, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  flex-wrap: wrap;
  font-family: var(--font-main, "Segoe UI", system-ui, sans-serif);
  font-size: 0.82rem;
  color: var(--color-muted-2, #b0bccc);
  min-height: 46px;
}
[data-theme="light"] .sim-bar {
  background: rgba(240, 244, 248, 0.92);
  border-color: rgba(0, 0, 0, 0.08);
}

/* ── Back / breadcrumb button (.sim-back) ─────────────────────── */
.sim-back {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: var(--color-muted-2, #b0bccc);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color 0.15s;
}
.sim-back:hover {
  color: var(--color-primary, #60a5fa);
}

/* ── Simulation title (.sim-title) ────────────────────────────── */
.sim-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text, #e2e8f0);
  white-space: nowrap;
  flex-shrink: 0;
}
[data-theme="light"] .sim-title {
  color: var(--color-text, #0f172a);
}

/* ── Bar divider (.sim-sep) ───────────────────────────────────── */
.sim-sep {
  width: 1px;
  height: 18px;
  background: rgba(255, 255, 255, 0.1);
  flex-shrink: 0;
}
[data-theme="light"] .sim-sep {
  background: rgba(0, 0, 0, 0.1);
}

/* ── Control group (.sim-ctrl) ────────────────────────────────── */
.sim-ctrl {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.sim-ctrl-label {
  font-size: 0.77rem;
  color: var(--color-muted, #94a3b8);
  white-space: nowrap;
}
.sim-ctrl input[type="range"],
.sim-ctrl-range {
  width: 88px;
  accent-color: var(--color-primary, #60a5fa);
  cursor: pointer;
  vertical-align: middle;
}
.sim-ctrl-val {
  font-size: 0.77rem;
  font-weight: 700;
  color: var(--color-primary, #60a5fa);
  min-width: 30px;
  font-variant-numeric: tabular-nums;
}

/* ── Action button (.sim-btn) ─────────────────────────────────── */
.sim-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 5px 13px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: var(--radius-full, 9999px);
  color: var(--color-muted-2, #b0bccc);
  font-size: 0.78rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background 0.15s,
    border-color 0.15s,
    color 0.15s;
}
.sim-btn:hover {
  background: rgba(96, 165, 250, 0.12);
  border-color: rgba(96, 165, 250, 0.4);
  color: var(--color-primary, #60a5fa);
}
.sim-btn.active,
.sim-btn[aria-pressed="true"] {
  background: rgba(96, 165, 250, 0.15);
  border-color: var(--color-primary, #60a5fa);
  color: var(--color-primary, #60a5fa);
}
[data-theme="light"] .sim-btn {
  background: rgba(0, 0, 0, 0.04);
  border-color: rgba(0, 0, 0, 0.12);
  color: #374151;
}
[data-theme="light"] .sim-btn:hover {
  background: rgba(37, 99, 235, 0.08);
  border-color: rgba(37, 99, 235, 0.35);
  color: #2563eb;
}

/* ── Icon-only button (.sim-btn-icon) ─────────────────────────── */
.sim-btn-icon {
  padding: 5px 8px;
  border-radius: var(--radius-md, 12px);
  font-size: 1rem;
  line-height: 1;
}

/* ── Select dropdown (.sim-select) ───────────────────────────── */
.sim-select {
  padding: 4px 9px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm, 6px);
  color: var(--color-muted-2, #b0bccc);
  font-size: 0.78rem;
  font-family: inherit;
  cursor: pointer;
  outline: none;
  transition: border-color 0.15s;
}
.sim-select:hover,
.sim-select:focus {
  border-color: var(--color-primary, #60a5fa);
}
[data-theme="light"] .sim-select {
  background: rgba(0, 0, 0, 0.04);
  border-color: rgba(0, 0, 0, 0.12);
  color: #374151;
}

/* ── Language switcher badge (.sim-lang) ──────────────────────── */
.sim-lang {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-full, 9999px);
  color: var(--color-muted-2, #b0bccc);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  flex-shrink: 0;
  transition:
    background 0.15s,
    border-color 0.15s,
    color 0.15s;
}
.sim-lang:hover {
  background: rgba(96, 165, 250, 0.1);
  border-color: rgba(96, 165, 250, 0.35);
  color: var(--color-primary, #60a5fa);
}

/* ── Floating panel (.sim-panel) ──────────────────────────────── */
.sim-panel {
  position: fixed;
  top: 54px;
  left: 14px;
  z-index: 90;
  background: rgba(8, 9, 14, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius-lg, 16px);
  padding: 14px 16px;
  min-width: 200px;
  font-family: var(--font-main, "Segoe UI", system-ui, sans-serif);
  font-size: 0.8rem;
  color: var(--color-muted-2, #b0bccc);
}
[data-theme="light"] .sim-panel {
  background: rgba(255, 255, 255, 0.94);
  border-color: rgba(0, 0, 0, 0.09);
  color: #374151;
}
.sim-panel-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--color-primary, #60a5fa);
  margin-bottom: 10px;
}
.sim-panel-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  font-size: 0.8rem;
  color: var(--color-muted-2, #b0bccc);
}
.sim-panel-val {
  color: var(--color-primary, #60a5fa);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.sim-panel hr,
.sim-panel-hr {
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  margin: 8px 0;
}
[data-theme="light"] .sim-panel hr,
[data-theme="light"] .sim-panel-hr {
  border-color: rgba(0, 0, 0, 0.07);
}
/* Full-width button inside panel */
.sim-panel .sim-btn {
  width: 100%;
  justify-content: center;
  margin-top: 8px;
  border-radius: var(--radius-md, 12px);
}

/* ── Stats overlay (.sim-stats) ───────────────────────────────── */
.sim-stats {
  position: fixed;
  top: 54px;
  right: 14px;
  z-index: 90;
  background: rgba(8, 9, 14, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md, 12px);
  padding: 10px 14px;
  font-family: var(--font-main, "Segoe UI", system-ui, sans-serif);
  font-size: 0.78rem;
  line-height: 2;
  min-width: 160px;
}
[data-theme="light"] .sim-stats {
  background: rgba(255, 255, 255, 0.94);
  border-color: rgba(0, 0, 0, 0.08);
}
.sim-stats-row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  color: var(--color-muted, #94a3b8);
}
.sim-stats-val {
  color: var(--color-primary, #60a5fa);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.sim-stats hr,
.sim-stats-sep {
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  margin: 4px 0;
}

/* ── FPS counter (.sim-fps) ───────────────────────────────────── */
.sim-fps {
  position: fixed;
  bottom: 14px;
  right: 14px;
  z-index: 90;
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--radius-sm, 6px);
  padding: 3px 8px;
  font-size: 0.7rem;
  font-family: var(--font-mono, monospace);
  color: var(--color-muted, #94a3b8);
  pointer-events: none;
  user-select: none;
}
.sim-fps span {
  color: var(--color-accent-2, #34d399);
  font-weight: 700;
}

/* ── Controls hint bar (.sim-hint) ───────────────────────────── */
.sim-hint {
  position: fixed;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 90;
  background: rgba(0, 0, 0, 0.58);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius-full, 9999px);
  padding: 6px 18px;
  font-family: var(--font-main, "Segoe UI", system-ui, sans-serif);
  font-size: 0.75rem;
  color: var(--color-muted, #94a3b8);
  pointer-events: none;
  white-space: nowrap;
}
.sim-hint kbd {
  display: inline-block;
  padding: 0 5px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  font-family: inherit;
  font-size: 0.72rem;
  color: var(--color-text, #e2e8f0);
}

/* ── Info badge (.sim-badge) ──────────────────────────────────── */
.sim-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-full, 9999px);
  font-size: 0.7rem;
  font-weight: 600;
  background: rgba(96, 165, 250, 0.13);
  color: var(--color-primary, #60a5fa);
  border: 1px solid rgba(96, 165, 250, 0.25);
}
.sim-badge-green {
  background: rgba(52, 211, 153, 0.12);
  color: #34d399;
  border-color: rgba(52, 211, 153, 0.25);
}
.sim-badge-yellow {
  background: rgba(251, 191, 36, 0.12);
  color: #fbbf24;
  border-color: rgba(251, 191, 36, 0.25);
}
.sim-badge-red {
  background: rgba(248, 113, 113, 0.12);
  color: #f87171;
  border-color: rgba(248, 113, 113, 0.25);
}

/* ── Reduced motion ───────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .sim-back,
  .sim-btn,
  .sim-lang,
  .sim-select {
    transition: none;
  }
}

/* ── Focus accessibility ──────────────────────────────────────── */
.sim-btn:focus-visible,
.sim-back:focus-visible,
.sim-lang:focus-visible,
.sim-select:focus-visible {
  outline: 2px solid var(--color-primary, #60a5fa);
  outline-offset: 2px;
}