:root {
  --bg: #000;
  --panel: rgba(10, 12, 16, .88);
  --line: rgba(255, 180, 90, .22);
  --text: #f3e9dc;
  --dim: #9a9184;
  --accent: #ffb454;
  --accent-2: #7fd4ff;
  --danger: #ff6b5e;
  --mono: "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  width: 100%; height: 100%; overflow: hidden;
  background: #000; color: var(--text);
  font-family: var(--sans);
  -webkit-user-select: none; user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
}
#app, #gl-canvas { position: fixed; inset: 0; width: 100%; height: 100%; display: block; }
canvas { display: block; background: #000; cursor: grab; }
canvas:active { cursor: grabbing; }

.hidden { display: none !important; }

/* boot / fatal overlays */
.overlay {
  position: fixed; inset: 0; z-index: 60; display: flex;
  flex-direction: column; align-items: center; justify-content: center;
  gap: 18px; background: #000; color: var(--text); text-align: center;
}
.boot-title {
  font-family: var(--mono); font-size: clamp(2rem, 8vw, 5rem);
  letter-spacing: .35em; margin-left: .35em;
  background: linear-gradient(90deg, #ffd9a0, #ff9b40 45%, #7fd4ff);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 26px rgba(255,150,60,.35));
}
.boot-sub { color: var(--dim); font-family: var(--mono); font-size: clamp(.65rem, 2vw, .9rem); letter-spacing: .25em; }
.spinner {
  width: 44px; height: 44px; border-radius: 50%;
  border: 2px solid rgba(255,180,84,.15); border-top-color: var(--accent);
  animation: spin 1s linear infinite;
}
#boot-msg { color: var(--dim); font-size: .8rem; }
@keyframes spin { to { transform: rotate(360deg); } }
.fatal-card {
  max-width: 560px; padding: 28px; border: 1px solid var(--line);
  background: var(--panel); border-radius: 14px; backdrop-filter: blur(12px);
  display: flex; flex-direction: column; gap: 14px; align-items: center;
}
.fatal-card h1 { color: var(--danger); font-family: var(--mono); font-size: 1.2rem; letter-spacing: .1em; }
.fatal-card p { color: var(--dim); line-height: 1.6; }
.fatal-card code { color: var(--accent); font-family: var(--mono); }
.fatal-card button {
  font: 600 .9rem var(--sans); color: #000; background: var(--accent);
  border: 0; padding: 10px 22px; border-radius: 999px; cursor: pointer;
}
.fatal-card button:hover { filter: brightness(1.1); }

/* HUD */
.hud {
  position: fixed; left: 22px; top: 22px; z-index: 40;
  pointer-events: none; max-width: min(520px, 82vw);
  text-shadow: 0 2px 12px #000;
}
.hud-brand {
  font-family: var(--mono); font-size: 1.25rem; letter-spacing: .28em;
  color: #fff; display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap;
}
.hud-brand .g {
  color: var(--accent); font-size: 1.6em;
  text-shadow: 0 0 18px rgba(255,160,60,.8);
}
.hud-tag { font-size: .55rem; letter-spacing: .16em; color: var(--dim); }
.hud-readout {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px;
}
.hud-readout > div {
  background: rgba(8,10,12,.5); border: 1px solid rgba(255,255,255,.08);
  border-radius: 7px; padding: 6px 9px; min-width: 76px;
  backdrop-filter: blur(6px); display: flex; flex-direction: column; gap: 2px;
}
.hud-readout span { font-size: .56rem; letter-spacing: .18em; color: var(--dim); }
.hud-readout b { font-size: .78rem; color: #fff; font-family: var(--mono); font-weight: 600; }
.hud-hint { margin-top: 10px; font-size: .68rem; color: var(--dim); letter-spacing: .08em; }

/* toolbar */
.toolbar {
  position: fixed; right: 18px; bottom: 18px; z-index: 42;
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap; justify-content: flex-end;
}
.presets {
  display: flex; gap: 6px; background: rgba(8,10,12,.55); padding: 6px;
  border: 1px solid rgba(255,255,255,.09); border-radius: 12px;
  backdrop-filter: blur(8px);
}
.presets button, .toolbar-right button, .icon-btn {
  font: 600 .74rem var(--sans); color: var(--text);
  background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.09);
  padding: 8px 12px; border-radius: 8px; cursor: pointer;
  letter-spacing: .04em; transition: all .15s ease;
}
.presets button:hover, .toolbar-right button:hover, .icon-btn:hover { border-color: var(--accent); color: #fff; }
.presets button.active { background: var(--accent); color: #000; border-color: var(--accent); }
.toolbar-right { display: flex; align-items: center; gap: 6px; background: rgba(8,10,12,.55); padding: 6px; border: 1px solid rgba(255,255,255,.09); border-radius: 12px; backdrop-filter: blur(8px); }
.toolbar-right label { font-size: .68rem; color: var(--dim); display: flex; align-items: center; gap: 6px; padding: 0 4px; }
.toolbar-right select {
  font: 600 .78rem var(--sans); color: var(--text); background: #14171b;
  border: 1px solid rgba(255,255,255,.14); padding: 7px 8px; border-radius: 8px;
}
.icon-btn { min-width: 36px; padding: 8px 10px; }
.icon-btn.active { color: var(--accent); border-color: var(--accent); }

/* side panel */
.panel {
  position: fixed; right: 0; top: 0; bottom: 0; z-index: 50;
  width: min(420px, 94vw); background: var(--panel);
  border-left: 1px solid var(--line); backdrop-filter: blur(18px);
  padding: 18px; overflow-y: auto; overscroll-behavior: contain;
  animation: slidein .22s ease;
}
@keyframes slidein { from { transform: translateX(40px); opacity: 0; } to { transform: none; opacity: 1; } }
.panel-head {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 12px; padding-bottom: 14px; border-bottom: 1px solid rgba(255,255,255,.1);
  margin-bottom: 12px;
}
.panel-head strong { font-family: var(--mono); font-size: .82rem; letter-spacing: .14em; color: var(--accent); display: block; }
.panel-head small { color: var(--dim); font-size: .68rem; letter-spacing: .1em; }
.panel-head button {
  color: var(--dim); background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.1);
  padding: 7px 10px; border-radius: 8px; cursor: pointer; font-size: .8rem;
}
.panel-head button:hover { color: #fff; border-color: var(--accent); }

.params { display: flex; flex-direction: column; gap: 12px; padding-bottom: 30px; }
.param { display: grid; grid-template-columns: 1fr; gap: 7px; }
.param .row { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.param label { font-size: .78rem; color: var(--text); letter-spacing: .03em; }
.param output { font: 600 .74rem var(--mono); color: var(--accent); min-width: 52px; text-align: right; }
input[type="range"] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 4px;
  background: linear-gradient(90deg, rgba(255,180,84,.65), rgba(255,180,84,.15));
  border-radius: 2px; outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none; width: 16px; height: 16px;
  border-radius: 50%; background: var(--accent); border: 2px solid #000;
  box-shadow: 0 0 12px rgba(255,160,60,.55); cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 15px; height: 15px; border-radius: 50%; background: var(--accent);
  border: 2px solid #000; cursor: pointer;
}
.param .desc { font-size: .62rem; color: var(--dim); }

/* help panel */
.help { width: min(520px, 96vw); }
.help-grid { display: grid; grid-template-columns: auto 1fr; gap: 9px 16px; align-items: center; padding: 10px 2px 16px; }
.help-grid > div:nth-child(even) { color: var(--dim); font-size: .8rem; }
kbd {
  font: 600 .72rem var(--mono); color: #000; background: var(--accent);
  padding: 3px 8px; border-radius: 6px; white-space: nowrap; justify-self: start;
}
.help-note { color: var(--dim); font-size: .72rem; line-height: 1.7; border-top: 1px solid rgba(255,255,255,.1); padding-top: 12px; }

/* toast */
.toast {
  position: fixed; left: 50%; bottom: 78px; transform: translateX(-50%);
  z-index: 70; background: rgba(8,10,12,.82); color: var(--text);
  border: 1px solid var(--line); padding: 10px 18px; border-radius: 999px;
  font-size: .8rem; letter-spacing: .06em; backdrop-filter: blur(10px);
  animation: fadeup 2.4s ease forwards;
}
@keyframes fadeup {
  0% { opacity: 0; transform: translate(-50%, 10px); }
  12% { opacity: 1; transform: translate(-50%, 0); }
  80% { opacity: 1; }
  100% { opacity: 0; transform: translate(-50%, -6px); }
}

@media (max-width: 720px) {
  .hud { left: 12px; top: 12px; }
  .hud-brand { font-size: 1rem; }
  .hud-readout > div { min-width: 60px; padding: 5px 7px; }
  .toolbar { left: 12px; right: 12px; bottom: 12px; justify-content: center; }
  .presets { order: 2; width: 100%; justify-content: space-between; }
  .presets button { flex: 1; }
  .toolbar-right { order: 1; }
  .panel { width: 100vw; }
}

/* URL 截图自动化：隐藏交互 UI，只保留 WebGL 画面 */
.shot-mode #toolbar,
.shot-mode #panel,
.shot-mode #help,
.shot-mode .hud {
  display: none !important;
}