:root {
  /* Light "parchment" theme (sepia monochrome) */
  --bg: #e9e2d0;
  --panel: #f3eede;
  --ink: #2b2620;
  --ink-soft: #6a6152;
  --line: #b7ab90;
  --accent: #8a2f22;          /* battle/loss red-brown */
  --btn-bg: #ded6c0;
  --btn-fg: #2b2620;
  --btn-border: #2b2620;
  --btn-hover: #ccc2a6;
  --debt: #8a2f22;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14130f;
    --panel: #1c1a15;
    --ink: #d9cfb8;
    --ink-soft: #9c927c;
    --line: #3a352b;
    --accent: #c8654f;
    --btn-bg: #2a2720;
    --btn-fg: #d9cfb8;
    --btn-border: #a99f86;
    --btn-hover: #38342a;
    --debt: #d9705c;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 20px 12px;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.5 "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}

.app {
  width: 100%;
  max-width: 720px;
  background: var(--panel);
  border: 1px solid var(--line);
}

.app__header { padding: 14px 16px 8px; border-bottom: 1px solid var(--line); }
.app__title { margin: 0; font-size: 22px; letter-spacing: 3px; font-weight: 700; }

/* current statistics bar */
.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  background: var(--line);
  border-bottom: 1px solid var(--line);
}
.stat {
  flex: 1 1 120px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 12px;
  background: var(--panel);
}
.stat__k { color: var(--ink-soft); text-transform: uppercase; font-size: 11px; letter-spacing: 1px; align-self: center; }
.stat__v { font-weight: 700; font-variant-numeric: tabular-nums; }
.stat__v.stat--debt { color: var(--debt); }

/* tabs */
.tabs { display: flex; gap: 0; border-bottom: 1px solid var(--line); }
.tab {
  font: inherit;
  padding: 8px 16px;
  border: none;
  border-right: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
}
.tab[aria-selected="true"] { background: var(--btn-bg); color: var(--ink); font-weight: 700; }

.panel { padding: 14px 16px 18px; }
.panel__h { margin: 12px 0 6px; font-size: 13px; text-transform: uppercase; letter-spacing: 1px; color: var(--ink-soft); }

/* scrollable log */
.log {
  height: 340px;
  overflow-y: auto;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--line);
}
.log__line { white-space: pre-wrap; word-break: break-word; }
.log__error { color: var(--debt); }
.log__rule { color: var(--ink-soft); white-space: pre; margin: 2px 0; }

/* controls */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}
.controls--col { flex-direction: column; align-items: stretch; }
.controls--save { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--line); }
.controls__label { align-self: center; color: var(--ink-soft); }

/* deliberately basic buttons: flat monochrome, hard square corners, no rounding/shadow */
.btn {
  font: inherit;
  padding: 8px 14px;
  border: 1px solid var(--btn-border);
  border-radius: 0;
  background: var(--btn-bg);
  color: var(--btn-fg);
  cursor: pointer;
  box-shadow: none;
  background-image: none;
  -webkit-appearance: none;
  appearance: none;
  text-align: left;
}
.btn:hover { background: var(--btn-hover); }
.btn:active { background: var(--btn-fg); color: var(--btn-bg); }
.btn:focus-visible { outline: 2px solid var(--btn-border); outline-offset: 1px; }
.btn--minor { font-size: 13px; padding: 6px 10px; color: var(--ink-soft); }

/* history ledger */
.ledger {
  margin: 0;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--line);
  overflow-x: auto;
  white-space: pre;
  font: inherit;
}

.help { line-height: 1.6; }
.help ul { padding-left: 18px; }
.help li { margin: 4px 0; }
.help code { background: var(--bg); padding: 1px 4px; border: 1px solid var(--line); }

.app__foot {
  padding: 10px 16px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 12px;
}
.app__foot a { color: var(--ink-soft); }

@media (max-width: 480px) {
  .app__title { font-size: 18px; letter-spacing: 2px; }
  .log { height: 300px; }
}