:root {
  --bg: #070610;
  --panel: rgba(14, 12, 28, 0.9);
  --border: rgba(140, 160, 255, 0.28);
  --text: #eef2ff;
  --muted: #9aa3c7;
  --accent: #9aa8ff;
  --accent2: #5eead4;
  --hot: #f472b6;
  --neon-violet: #a78bfa;
  --neon-lime: #a3e635;
  --danger: #fb7185;
  --btn-bg: rgba(255, 255, 255, 0.04);
  --hud-fade: rgba(7, 6, 16, 0.92);
  --toast-bg: rgba(14, 12, 28, 0.94);
  --dock-bg: rgba(8, 8, 18, 0.96);
  --loader-bg: radial-gradient(circle at 50% 40%, #14122a, #05040a);
  --tagline-bg: rgba(10, 10, 22, 0.72);
  --shadow: 0 16px 48px rgba(0, 0, 0, 0.55);
  --dock-h: 4.3rem;
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-t: env(safe-area-inset-top, 0px);
  font-family: "IBM Plex Sans", system-ui, sans-serif;
}

html.theme-light {
  --bg: #b7c3d6;
  --panel: rgba(255, 255, 255, 0.88);
  --border: rgba(40, 55, 90, 0.22);
  --text: #152033;
  --muted: #4a5a78;
  --accent: #3b5bdb;
  --accent2: #0f766e;
  --hot: #be185d;
  --danger: #be123c;
  --btn-bg: rgba(20, 35, 70, 0.06);
  --hud-fade: rgba(183, 195, 214, 0.94);
  --toast-bg: rgba(255, 255, 255, 0.96);
  --dock-bg: rgba(255, 255, 255, 0.96);
  --loader-bg: radial-gradient(circle at 50% 40%, #e8eef8, #b7c3d6);
  --tagline-bg: rgba(255, 255, 255, 0.82);
  --shadow: 0 14px 36px rgba(30, 45, 80, 0.16);
}

* { box-sizing: border-box; }
html, body {
  margin: 0; height: 100%; overflow: hidden;
  background: var(--bg); color: var(--text);
  -webkit-tap-highlight-color: transparent;
}
#canvas { display: block; width: 100vw; height: 100dvh; touch-action: none; }

.hud-top {
  position: fixed; top: 0; left: 0; right: 0; z-index: 10;
  display: flex; justify-content: space-between; align-items: center;
  gap: 0.75rem; flex-wrap: wrap; pointer-events: none;
  padding: calc(0.55rem + var(--safe-t)) 0.9rem 0.5rem;
  background: linear-gradient(180deg, var(--hud-fade), transparent);
}
.hud-left, .hud-mid {
  display: flex; align-items: center; gap: 0.55rem; pointer-events: auto;
}
.back-lab {
  padding: 0.4rem 0.7rem; border-radius: 999px;
  border: 1px solid rgba(225, 6, 0, 0.45);
  background: rgba(225, 6, 0, 0.12); color: #ffd0cc;
  text-decoration: none; font-size: 0.72rem; font-weight: 600;
}
html.theme-light .back-lab {
  color: #9a1a12;
  background: rgba(225, 6, 0, 0.1);
  border-color: rgba(225, 6, 0, 0.35);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.28rem 0.45rem 0.28rem 0.3rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--btn-bg);
  color: var(--muted);
  font: inherit;
  font-size: 0.68rem;
  font-weight: 500;
  cursor: pointer;
}
.theme-toggle:hover {
  color: var(--text);
  border-color: rgba(139, 156, 255, 0.45);
  background: rgba(139, 156, 255, 0.1);
}
.theme-toggle__track {
  position: relative;
  width: 2.1rem;
  height: 1.15rem;
  border-radius: 999px;
  background: rgba(120, 140, 180, 0.28);
  flex: 0 0 auto;
}
html.theme-light .theme-toggle__track {
  background: rgba(79, 107, 237, 0.35);
}
.theme-toggle__thumb {
  position: absolute;
  top: 0.14rem;
  left: 0.14rem;
  width: 0.87rem;
  height: 0.87rem;
  border-radius: 50%;
  background: #f2f5fa;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
  transition: transform 0.2s ease;
}
.theme-toggle.is-light .theme-toggle__thumb {
  transform: translateX(0.92rem);
  background: #fff;
}
.theme-toggle__label { min-width: 2.4rem; text-align: left; }

.brand strong {
  display: block; font-family: Syne, sans-serif;
  font-size: 1rem; letter-spacing: 0.02em;
}
.brand small { color: var(--muted); font-size: 0.7rem; }

.pill {
  display: flex; flex-direction: column;
  padding: 0.28rem 0.55rem; border-radius: 10px;
  border: 1px solid var(--border); background: var(--btn-bg);
  min-width: 3.4rem;
}
.pill span { font-size: 0.56rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; }
.pill strong { font-size: 0.88rem; font-variant-numeric: tabular-nums; }
.pill.soft { opacity: 0.9; }

.tagline {
  position: fixed; top: calc(3.5rem + var(--safe-t)); left: 50%;
  transform: translateX(-50%); z-index: 10;
  margin: 0; max-width: min(560px, calc(100vw - 1.5rem));
  padding: 0.45rem 0.8rem; border-radius: 999px;
  border: 1px solid rgba(140, 160, 255, 0.2);
  background: var(--tagline-bg);
  color: var(--muted); font-size: 0.72rem; text-align: center;
  pointer-events: none; backdrop-filter: blur(8px);
}

.panel {
  position: fixed; top: 5.6rem; z-index: 12;
  width: min(250px, calc(100vw - 1.4rem));
  max-height: calc(100dvh - 7rem);
  border: 1px solid var(--border); border-radius: 16px;
  background: var(--panel); box-shadow: var(--shadow);
  backdrop-filter: blur(14px); overflow: hidden;
  display: flex; flex-direction: column;
}
.panel-left { left: 0.7rem; }
.panel-right { right: 0.7rem; }
.panel.collapsed .panel-body { display: none; }
.panel.collapsed .chevron { transform: rotate(-45deg); }

.panel-head {
  width: 100%; margin: 0; padding: 0.7rem 0.85rem; border: 0;
  background: transparent; color: var(--muted); cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  font: inherit; font-size: 0.68rem; font-weight: 650;
  letter-spacing: 0.12em; text-transform: uppercase;
}
.panel-head:hover { background: rgba(255, 255, 255, 0.04); }
html.theme-light .panel-head:hover { background: rgba(30, 50, 90, 0.05); }
.chevron {
  width: 0.5rem; height: 0.5rem;
  border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted);
  transform: rotate(45deg); transition: transform 0.2s;
}
.panel-body { padding: 0 0.85rem 0.85rem; overflow: auto; }

.btn-grid, .tool-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem;
}
button {
  border: 1px solid var(--border); border-radius: 10px;
  background: var(--btn-bg); color: var(--text);
  padding: 0.55rem 0.45rem; font: inherit; font-size: 0.76rem;
  font-weight: 500; cursor: pointer;
}
button:hover { background: rgba(139, 156, 255, 0.14); }
button.hot {
  border-color: rgba(244, 114, 182, 0.55);
  color: #fbcfe8;
  box-shadow: 0 0 14px rgba(244, 114, 182, 0.18);
}
html.theme-light button.hot { color: #9d174d; border-color: rgba(219, 39, 119, 0.4); }
button.danger { border-color: rgba(251, 113, 133, 0.45); color: #fecdd3; }
html.theme-light button.danger { color: #be123c; border-color: rgba(225, 29, 72, 0.4); }
button.active, .tool.active {
  background: linear-gradient(135deg, rgba(139,156,255,0.28), rgba(94,234,212,0.14));
  border-color: rgba(94, 234, 212, 0.5);
  box-shadow: 0 0 16px rgba(94, 234, 212, 0.22);
}
label {
  display: block; margin: 0.55rem 0 0; font-size: 0.72rem; color: var(--muted);
}
input[type="range"] { width: 100%; margin-top: 0.28rem; accent-color: var(--accent2); }
.hint { margin: 0.65rem 0 0; font-size: 0.68rem; line-height: 1.4; color: var(--muted); }

.toast {
  position: fixed; left: 50%; bottom: 1.2rem; transform: translateX(-50%);
  z-index: 50; padding: 0.65rem 1rem; border-radius: 12px;
  border: 1px solid rgba(94, 234, 212, 0.35);
  background: var(--toast-bg); color: var(--text); font-size: 0.78rem;
}
.toast[hidden] { display: none; }

.mobile-dock, .sheet-backdrop { display: none; }

.loader {
  position: fixed; inset: 0; z-index: 100; display: grid; place-items: center;
  background: var(--loader-bg);
  transition: opacity 0.45s, visibility 0.45s;
}
.loader.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.loader-inner { text-align: center; }
.loader-ring {
  width: 48px; height: 48px; margin: 0 auto 1rem;
  border: 3px solid rgba(139,156,255,0.2); border-top-color: var(--accent2);
  border-radius: 50%; animation: spin 0.85s linear infinite;
}
.loader a { color: var(--muted); font-size: 0.78rem; }
@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 820px) {
  .desktop-only { display: none !important; }
  .theme-toggle__label { display: none; }
  .tagline { font-size: 0.65rem; top: calc(4rem + var(--safe-t)); }
  .panel {
    top: auto; left: 0.65rem; right: 0.65rem;
    bottom: calc(var(--dock-h) + var(--safe-b) + 0.5rem);
    width: auto; max-height: min(50dvh, 360px);
    transform: translateY(110%); opacity: 0; pointer-events: none;
    transition: transform 0.28s, opacity 0.2s; z-index: 30;
  }
  .panel.sheet-open { transform: none; opacity: 1; pointer-events: auto; }
  .panel .chevron { display: none; }
  .panel-head { pointer-events: none; }
  .sheet-backdrop {
    display: block; position: fixed; inset: 0; z-index: 25;
    background: rgba(0,0,0,0.45); opacity: 0; pointer-events: none;
  }
  .sheet-backdrop.show { opacity: 1; pointer-events: auto; }
  .toast { bottom: calc(var(--dock-h) + var(--safe-b) + 0.8rem); }
  .mobile-dock {
    display: grid; grid-template-columns: repeat(5, 1fr);
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 40;
    height: calc(var(--dock-h) + var(--safe-b));
    padding: 0.28rem 0.25rem calc(0.28rem + var(--safe-b));
    gap: 0.2rem; background: var(--dock-bg);
    border-top: 1px solid var(--border);
  }
  .mobile-dock button, .mobile-dock a {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 0.08rem; min-height: 3rem; border-radius: 11px; font-size: 0.72rem;
    text-decoration: none; color: var(--text);
    border: 1px solid var(--border); background: var(--btn-bg);
  }
  .mobile-dock span { font-size: 0.55rem; color: var(--muted); }
  .mobile-dock a.dock-home {
    border-color: rgba(225,6,0,0.4); background: rgba(225,6,0,0.12); color: #ffd0cc;
  }
  html.theme-light .mobile-dock a.dock-home { color: #9a1a12; }
  html.theme-light .sheet-backdrop { background: rgba(30, 50, 80, 0.28); }
}