/* Yingzao Fashi Assembly — UI shell.
   Themes: automatic (system), light, dark. The 3D canvas is transparent so the
   page background gradient supplies the sky. */

:root {
  --font-sans: "Inter", "Helvetica Neue", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --font-han: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;

  --accent: #c0392b;
  --accent-2: #2f6b6a;
  --gold: #b98b45;

  --radius: 12px;
  --radius-sm: 8px;
  --pad: 14px;

  --sky-top: #cfe0ef;
  --sky-bottom: #eef3f1;
  --ground: rgba(120, 106, 88, 0.18);

  --surface: rgba(252, 251, 248, 0.86);
  --surface-solid: #fbfaf7;
  --border: rgba(40, 30, 20, 0.16);
  --text: #241c14;
  --text-dim: #6a5c4c;
  --shadow: 0 10px 30px rgba(30, 20, 10, 0.16);
  --chip: rgba(40, 30, 20, 0.07);
  --chip-active: rgba(192, 57, 43, 0.16);
}

html[data-theme="dark"] {
  --sky-top: #131a24;
  --sky-bottom: #1d2530;
  --ground: rgba(10, 14, 20, 0.5);

  --surface: rgba(22, 27, 34, 0.84);
  --surface-solid: #161b22;
  --border: rgba(226, 232, 240, 0.16);
  --text: #e8eef5;
  --text-dim: #a7b3c2;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  --chip: rgba(226, 232, 240, 0.08);
  --chip-active: rgba(226, 160, 74, 0.22);
  --accent: #e2703f;
}

@media (prefers-color-scheme: dark) {
  html[data-theme="auto"] {
    --sky-top: #131a24;
    --sky-bottom: #1d2530;
    --ground: rgba(10, 14, 20, 0.5);
    --surface: rgba(22, 27, 34, 0.84);
    --surface-solid: #161b22;
    --border: rgba(226, 232, 240, 0.16);
    --text: #e8eef5;
    --text-dim: #a7b3c2;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    --chip: rgba(226, 232, 240, 0.08);
    --chip-active: rgba(226, 160, 74, 0.22);
    --accent: #e2703f;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: radial-gradient(120% 100% at 50% 8%, var(--sky-top) 0%, var(--sky-bottom) 62%, var(--sky-bottom) 100%);
  -webkit-font-smoothing: antialiased;
}

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

#stage {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  cursor: grab;
  outline: none;
}

#stage:active { cursor: grabbing; }

#stage:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -3px;
}

/* ---------- shared surfaces ---------- */

.glass {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px) saturate(1.2);
  -webkit-backdrop-filter: blur(12px) saturate(1.2);
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.72rem;
  line-height: 1;
  padding: 2px 5px;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: var(--chip);
  color: var(--text-dim);
}

/* ---------- title ---------- */

#titlebar {
  position: absolute;
  top: 16px;
  left: 16px;
  width: min(360px, calc(100vw - 32px));
  padding: var(--pad) 16px;
  pointer-events: none;
}

#titlebar .eyebrow {
  margin: 0 0 6px;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
}

#titlebar h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.5rem;
  line-height: 1.15;
}

#titlebar h1 span { font-family: var(--font-han); }

#titlebar h1 small {
  display: block;
  margin-top: 4px;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-dim);
}

.facts {
  margin: 12px 0 0;
  display: grid;
  gap: 5px;
  font-size: 0.76rem;
}

.facts > div { display: flex; gap: 8px; }

.facts dt {
  flex: 0 0 62px;
  color: var(--text-dim);
  text-transform: uppercase;
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  padding-top: 2px;
}

.facts dd { margin: 0; line-height: 1.35; }

.note {
  margin: 10px 0 0;
  font-size: 0.68rem;
  line-height: 1.45;
  color: var(--text-dim);
}

/* ---------- panel ---------- */

#panel {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 306px;
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 6px var(--pad) var(--pad);
}

#panel[hidden] { display: none; }

.block {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.block:last-child { border-bottom: 0; padding-bottom: 2px; }

.block h2 {
  margin: 0 0 9px;
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  font-weight: 600;
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.row:not(:last-child) { margin-bottom: 8px; }

button {
  font: inherit;
  font-size: 0.78rem;
  color: var(--text);
  background: var(--chip);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 10px;
  cursor: pointer;
  transition: background 120ms ease, transform 120ms ease, color 120ms ease;
}

button:hover { background: rgba(192, 57, 43, 0.12); }
button:active { transform: translateY(1px); }

button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button.primary {
  background: var(--accent);
  border-color: transparent;
  color: #fff;
  font-weight: 600;
  min-width: 86px;
}

button.primary:hover { filter: brightness(1.08); background: var(--accent); }

.segmented {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.segmented button {
  border: 0;
  border-radius: 0;
  background: transparent;
  padding: 7px 4px;
  text-align: center;
}

.segmented button + button { border-left: 1px solid var(--border); }
.segmented button[aria-checked="true"] { background: var(--chip-active); font-weight: 600; }
.segmented.small button { font-size: 0.72rem; padding: 5px 3px; }

/* ---------- fields ---------- */

.field { display: block; margin-top: 4px; }

.fieldlabel {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-bottom: 5px;
}

.fieldlabel em { font-style: normal; color: var(--text); font-variant-numeric: tabular-nums; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 22px;
  background: transparent;
  cursor: pointer;
  margin: 0;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 5px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--accent) var(--fill, 0%), var(--chip) var(--fill, 0%));
}

input[type="range"]::-moz-range-track {
  height: 5px;
  border-radius: 3px;
  background: var(--chip);
}

input[type="range"]::-moz-range-progress {
  height: 5px;
  border-radius: 3px;
  background: var(--accent);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 15px;
  height: 15px;
  margin-top: -5px;
  border-radius: 50%;
  background: var(--surface-solid);
  border: 2px solid var(--accent);
}

input[type="range"]::-moz-range-thumb {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--surface-solid);
  border: 2px solid var(--accent);
}

.check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  padding: 3px 0;
  cursor: pointer;
}

.check input { accent-color: var(--accent); width: 15px; height: 15px; }
.check span { display: inline-flex; align-items: center; gap: 6px; }

.hint {
  margin: 6px 0 0;
  font-size: 0.68rem;
  line-height: 1.5;
  color: var(--text-dim);
}

.list { margin: 4px 0 0; padding-left: 16px; }
.list li { margin-bottom: 4px; }
.keys { margin-top: 8px; }

/* ---------- stages ---------- */

.stages {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: stage;
}

.stages li { margin-bottom: 4px; }

.stages button {
  width: 100%;
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 8px;
  text-align: left;
  padding: 7px 9px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  line-height: 1.25;
}

.stages button .num {
  font-size: 0.66rem;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
  padding-top: 2px;
}

.stages button .zh { font-family: var(--font-han); font-size: 0.8rem; display: block; }
.stages button .en { font-size: 0.68rem; color: var(--text-dim); display: block; }

.stages li[data-state="active"] button {
  background: var(--chip-active);
  border-color: var(--border);
}

.stages li[data-state="done"] button .num { color: var(--accent); font-weight: 700; }

/* ---------- status ---------- */

#status {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  margin: 0;
  padding: 8px 16px;
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
  pointer-events: none;
}

/* ---------- 3D labels ---------- */

#labels {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.tag {
  position: absolute;
  top: 0;
  left: 0;
  transform: translate(-50%, -50%);
  padding: 5px 9px 6px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: 0 4px 14px rgba(20, 12, 4, 0.22);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 220ms ease;
  will-change: transform;
}

.tag.visible { opacity: 1; }

.tag .zh {
  font-family: var(--font-han);
  font-size: 0.86rem;
  font-weight: 600;
  margin-right: 6px;
}

.tag .py {
  font-size: 0.66rem;
  color: var(--accent);
  letter-spacing: 0.05em;
  text-transform: lowercase;
}

.tag .fn {
  display: block;
  margin-top: 3px;
  font-size: 0.64rem;
  line-height: 1.4;
  color: var(--text-dim);
  white-space: normal;
  max-width: 216px;
}

.tag::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 50%;
  width: 7px;
  height: 7px;
  margin-top: -3.5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(192, 57, 43, 0.22);
}

.tooltip {
  position: absolute;
  z-index: 5;
  max-width: 250px;
  padding: 8px 11px 9px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  pointer-events: none;
  transform: translate(12px, 12px);
}

.tooltip .zh { font-family: var(--font-han); font-size: 0.95rem; font-weight: 600; }
.tooltip .py { font-size: 0.72rem; color: var(--accent); margin-left: 6px; }
.tooltip .fn { display: block; margin-top: 5px; font-size: 0.7rem; line-height: 1.45; color: var(--text); }
.tooltip .where {
  display: block;
  margin-top: 5px;
  font-size: 0.64rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
}

/* ---------- toggle ---------- */

#panelToggle {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  font-size: 1rem;
  border-radius: 10px;
  z-index: 4;
}

#panelToggle[hidden] { display: none; }
#panelToggle[aria-expanded="true"] { top: 16px; right: 334px; }

.noscript {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  padding: 16px 22px;
  font-size: 0.9rem;
}

/* ---------- responsive ---------- */

@media (max-width: 980px) {
  #titlebar { width: min(300px, calc(100vw - 32px)); padding: 10px 12px; }
  #titlebar h1 { font-size: 1.25rem; }
  #titlebar .facts { font-size: 0.7rem; }
  #titlebar .note { display: none; }
}

@media (max-width: 720px) {
  #panel {
    top: auto;
    bottom: 12px;
    right: 12px;
    left: 12px;
    width: auto;
    max-height: 46vh;
  }
  #panelToggle[aria-expanded="true"] { top: 12px; right: 12px; }
  #titlebar { width: calc(100vw - 32px); }
  #titlebar .facts > div:nth-child(n + 3) { display: none; }
  #status { bottom: auto; top: calc(46vh + 28px); font-size: 0.7rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
  #stage { cursor: default; }
}