:root {
  /* bright is the default; body.theme-dark below restores the original night look */
  --bg: #1b2534;
  --panel: #222f42;
  --panel-2: #2b3a51;
  --line: #3d5171;
  --text: #eaf1fb;
  --muted: #b3c4dc;
  --cyan: #45d0e0;
  --green: #4ade80;
  --amber: #f5a524;
  --red: #f87171;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(1100px 600px at 20% -10%, #2b3c55 0%, transparent 60%),
    radial-gradient(900px 500px at 110% 10%, #24404f 0%, transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
}

h1, h2, h3 { margin: 0; line-height: 1.2; }
kbd {
  font: inherit;
  font-size: 0.75em;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0 4px;
  color: var(--muted);
}

/* ------------------------------------------------------------------ chrome */
body.theme-dark {
  --bg: #070b12;
  --panel: #101823;
  --panel-2: #16202e;
  --line: #24334a;
  --text: #dbe6f3;
  --muted: #8ea3bd;
  background:
    radial-gradient(1100px 600px at 20% -10%, #142033 0%, transparent 60%),
    radial-gradient(900px 500px at 110% 10%, #10202b 0%, transparent 55%),
    var(--bg);
}
body.theme-dark .stage { background: #0a0f18; }
body.theme-dark #board { background: #05080d; }

.topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 18px clamp(16px, 4vw, 40px);
  border-bottom: 1px solid var(--line);
  background: rgba(9, 14, 22, 0.75);
}
.brand { display: flex; gap: 14px; align-items: center; }
.logo {
  display: grid;
  place-items: center;
  width: 44px; height: 44px;
  border-radius: 10px;
  background: linear-gradient(140deg, #1b3a4a, #123047);
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-size: 22px;
}
.topbar h1 { font-size: 22px; letter-spacing: 0.02em; }
.topbar p { margin: 4px 0 0; color: var(--muted); font-size: 13px; max-width: 60ch; }
.topbar-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.btn {
  font: inherit;
  font-size: 14px;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 14px;
  cursor: pointer;
  transition: border-color .15s, background .15s, transform .05s;
}
.btn:hover { border-color: var(--cyan); background: #1b2838; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: #12463c; border-color: var(--green); color: #d9ffe9; }
.btn-primary:hover { background: #15594b; border-color: var(--green); }

/* ------------------------------------------------------------------- stage */
.shell {
  display: grid;
  grid-template-columns: minmax(320px, 560px) minmax(260px, 340px);
  gap: 22px;
  justify-content: center;
  align-items: start;
  padding: 22px clamp(12px, 3vw, 40px);
}
.stage {
  position: relative;
  background: #1a2434;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, .45);
}
#board {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  image-rendering: auto;
  border-radius: 6px;
  background: #1a2434;
  touch-action: none;
}

.overlay {
  position: absolute;
  inset: 10px;
  display: grid;
  place-items: center;
  overflow-y: auto;
  background: rgba(12, 18, 28, .86);
  border-radius: 6px;
  backdrop-filter: blur(2px);
}
.overlay.hidden { display: none; }
.overlay-card {
  text-align: center;
  padding: 20px;
  max-width: 92%;
  max-height: 100%;
  overflow-y: auto;
}
.overlay-card h2 { font-size: 26px; margin-bottom: 10px; }
.overlay-card p { color: var(--muted); margin: 0 0 14px; line-height: 1.5; }
.ov-stats {
  display: flex;
  gap: 18px;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--text);
  font-size: 14px;
  flex-wrap: wrap;
}
.ov-stats b { color: var(--cyan); }
.overlay-buttons { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* ------------------------------------------------------------------- panel */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  display: grid;
  gap: 16px;
  align-content: start;
}
.panel-head { display: grid; gap: 6px; }
.pill {
  justify-self: start;
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--cyan);
  border: 1px solid #1d4653;
  background: #0e2530;
  border-radius: 999px;
  padding: 3px 10px;
}
.panel h2 { font-size: 19px; }

.gauges { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.gauge {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
  display: grid;
  gap: 2px;
}
.gauge-label { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }
.gauge strong { font-size: 18px; font-variant-numeric: tabular-nums; }
.gauge.warn strong { color: var(--red); }

.socket-state {
  font-size: 13px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px dashed var(--line);
  color: var(--muted);
}
.socket-state.ready {
  border-style: solid;
  border-color: var(--green);
  color: #c9ffe0;
  background: #0f2e22;
}

.belt h3, .hint-box h3 {
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}
.inventory { display: flex; flex-wrap: wrap; gap: 8px; }
.inventory .empty { color: var(--muted); font-size: 13px; }
.chip {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 10px 4px 4px;
}
.chip canvas { width: 22px; height: 22px; }
.chip b { color: var(--cyan); }

.hint-box {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: 8px;
  padding: 10px 12px;
}
.hint-box p { margin: 0; font-size: 13px; line-height: 1.5; color: var(--text); }
.hint-box.live { border-left-color: var(--amber); background: #21201a; }

.toast {
  margin: 0;
  min-height: 18px;
  font-size: 13px;
  color: var(--green);
  transition: opacity .3s;
}
.panel-buttons { display: flex; gap: 8px; }
.panel-buttons .btn { flex: 1; }

/* --------------------------------------------------------------- touch pad */
.dpad { display: none; justify-content: center; padding: 2px 0 4px; }
.dpad-row { display: flex; gap: 10px; }
.dpad-btn {
  width: 62px; height: 62px;
  font-size: 20px;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
  touch-action: manipulation;
}
.dpad-btn:active { background: #22344a; }

/* ---------------------------------------------------------------- dialogs */
dialog {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--text);
  max-width: 640px;
  width: calc(100% - 32px);
  padding: 22px;
}
dialog::backdrop { background: rgba(4, 7, 12, .72); }
dialog h2 { margin-bottom: 8px; }
dialog p { color: var(--muted); line-height: 1.55; font-size: 14px; }
dialog p strong { color: var(--text); }
.muted { color: var(--muted); }

.level-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; margin: 14px 0 18px; }
.level-card {
  text-align: left;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  cursor: pointer;
  color: var(--text);
  font: inherit;
}
.level-card:hover:not(:disabled) { border-color: var(--cyan); }
.level-card:disabled { opacity: .45; cursor: not-allowed; }
.level-card .n { font-size: 11px; color: var(--muted); letter-spacing: .1em; text-transform: uppercase; }
.level-card .t { display: block; font-size: 14px; margin: 2px 0 4px; }
.level-card .best { font-size: 11px; color: var(--green); }

.legend { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 10px; margin: 16px 0; }
.legend-item { display: flex; gap: 10px; align-items: center; font-size: 12.5px; }
.legend-item canvas { width: 34px; height: 34px; border-radius: 6px; flex: none; }
.legend-item span b { display: block; color: var(--text); }
.legend-item span { color: var(--muted); line-height: 1.35; }

.foot {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  padding: 8px 16px 28px;
}

@media (max-width: 900px) {
  .shell { grid-template-columns: minmax(0, 560px); }
  .dpad { display: flex; flex-direction: column; align-items: center; gap: 10px; }
}

/* ------------------------------------------------------------- build spec */
.spec-list { display: grid; gap: 6px; }
.spec-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  padding: 3px 8px 3px 3px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-2);
}
.spec-row canvas { width: 26px; height: 26px; flex: none; }
.spec-row .n { flex: 1; }
.spec-row .q { font-variant-numeric: tabular-nums; color: var(--muted); }
.spec-row.done { border-color: #1f6f4a; background: #10261f; }
.spec-row.done .q { color: var(--green); }
.spec-row.done .n { color: #c9ffe0; }

.toast.bad { color: var(--red); }

/* -------------------------------------------------------- win boot screen */
.boot {
  text-align: left;
  font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--green);
  background: #04120b;
  border: 1px solid #1f6f4a;
  border-radius: 8px;
  padding: 12px 14px;
  margin: 0 auto 14px;
  max-width: 380px;
  min-height: 120px;
  max-height: 34vh;
  white-space: pre-wrap;
  overflow: auto;
}
.boot.hidden { display: none; }
.overlay-card .stars, .stars { margin: 0 0 12px; font-size: 22px; letter-spacing: 4px; color: var(--amber); min-height: 26px; }
.level-card .stars { color: var(--amber); font-size: 13px; letter-spacing: 2px; margin: 0; min-height: 0; }

/* --------------------------------------------------------------- full screen */
body.fs { overflow: hidden; }
body.fs .topbar { padding: 8px clamp(12px, 3vw, 28px); }
body.fs .topbar p { display: none; }
body.fs .topbar h1 { font-size: 17px; }
body.fs .logo { width: 34px; height: 34px; font-size: 17px; }
body.fs .foot { display: none; }
body.fs .shell {
  grid-template-columns: auto minmax(260px, 340px);
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 12px clamp(10px, 2vw, 28px);
}
body.fs .stage { padding: 8px; }
body.fs #board {
  width: auto;
  max-width: none;
  height: min(calc(100vh - 116px), calc(100vw - 420px));
}
body.fs .panel { max-height: calc(100vh - 96px); overflow-y: auto; }

@media (max-width: 900px) {
  body.fs { overflow: auto; }
  body.fs .shell { grid-template-columns: minmax(0, 1fr); }
  body.fs #board { height: min(calc(100vh - 300px), calc(100vw - 44px)); }
  body.fs .panel { max-height: none; }
}

/* ------------------------------------------------------- knowledge cards */
.note-box .field-note { font-size: 12.5px; line-height: 1.55; color: var(--muted); }
.field-note.filled {
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  border-radius: 8px;
  padding: 9px 11px;
}
.field-note .fn-head { display: flex; align-items: center; gap: 8px; margin-bottom: 5px; }
.field-note .fn-head canvas { width: 26px; height: 26px; flex: none; }
.field-note .fn-head b { color: var(--amber); font-size: 13px; }

.know-list { display: grid; gap: 16px; margin: 14px 0 18px; max-height: 60vh; overflow-y: auto; }
.know-group h3 {
  font-size: 11px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--cyan); margin-bottom: 8px;
}
.know-row {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 9px 0; border-top: 1px solid var(--line);
}
.know-row canvas { width: 38px; height: 38px; flex: none; }
.know-row .kn { font-size: 13px; }
.know-row .kn b { display: block; color: var(--text); margin-bottom: 3px; }
.know-row .kn span { color: var(--muted); line-height: 1.55; font-size: 12.5px; }

/* ------------------------------------------------------- knowledge check */
.quiz { text-align: left; max-width: 420px; margin: 0 auto 14px; }
.quiz h3 { font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--cyan); margin-bottom: 8px; }
.quiz .q { font-size: 13px; color: var(--text); line-height: 1.55; margin: 0 0 10px; }
.quiz-options { display: grid; gap: 6px; }
.quiz-options .btn { text-align: left; }
.quiz-options .btn.right { border-color: var(--green); background: #10261f; }
.quiz-options .btn.wrong { border-color: var(--red); background: #2a1414; }
.quiz-verdict { font-size: 12.5px; margin: 10px 0 0; color: var(--muted); }

body.lang-zh .boot { font-family: ui-monospace, "Noto Sans Mono CJK SC", monospace; }