/* Released Condition — warm ledger / graph-paper aesthetic.
   Distinctive, not generic: paper background with a faint grid,
   serif equations, an accent that marks the "released" slot. */

:root {
  --paper: #f6f1e7;
  --paper-2: #efe7d6;
  --ink: #2b2620;
  --ink-soft: #5c5344;
  --line: #d8cdb6;
  --line-soft: #e6dcc8;
  --accent: #b0492a;      /* released / active condition */
  --accent-soft: #e9c9b8;
  --teal: #2f6f6a;        /* confirmed world */
  --teal-soft: #cfe4e0;
  --card: #fffdf8;
  --shadow: 0 1px 2px rgba(43,38,32,.06), 0 8px 24px rgba(43,38,32,.08);
  --radius: 14px;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 28px 28px;
  line-height: 1.55;
}

/* ---------- header ---------- */
.top {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,253,248,.7), rgba(255,253,248,0));
}
.top__inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 28px 20px 22px;
}
.top__title {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(30px, 5vw, 44px);
  letter-spacing: -.01em;
  line-height: 1.05;
}
.top__sub {
  margin: 10px 0 0;
  max-width: 60ch;
  color: var(--ink-soft);
  font-size: 15px;
}

/* ---------- layout ---------- */
.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 20px 48px;
  display: grid;
  gap: 18px;
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 22px;
}
.panel__h {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: 22px;
  letter-spacing: -.01em;
}
.panel__note {
  margin: 0 0 16px;
  color: var(--ink-soft);
  font-size: 14.5px;
  max-width: 68ch;
}

/* ---------- base equation ---------- */
.base__row {
  display: flex;
  align-items: flex-end;
  gap: 14px;
  flex-wrap: wrap;
}
.op {
  font-family: var(--serif);
  font-size: 34px;
  line-height: 1;
  color: var(--ink-soft);
  padding-bottom: 22px;
}
.num {
  display: inline-flex;
  flex-direction: column;
  gap: 6px;
  min-width: 92px;
}
.num--wide { min-width: 140px; }
.num__label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--ink-soft);
}
.num input {
  font-family: var(--serif);
  font-size: 30px;
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
}
.num input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}
.num__val {
  font-family: var(--serif);
  font-size: 30px;
  padding: 8px 12px;
  border: 1px dashed var(--line);
  border-radius: 10px;
  background: var(--paper-2);
  min-width: 72px;
  text-align: center;
}
.base__status {
  margin: 14px 0 0;
  font-size: 14px;
  color: var(--ink-soft);
  min-height: 1.2em;
}
.base__status.is-bad { color: var(--accent); }
.base__each {
  font-size: 13px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: .1em;
  align-self: center;
  padding-bottom: 22px;
}

/* ---------- scenario (first screen) ---------- */
.scenario__lead {
  font-size: 16px;
  color: var(--ink);
  max-width: 62ch;
  margin: 0 0 14px;
}
.scenario__lead .eq {
  font-family: var(--serif);
  font-size: 1.05em;
  background: var(--paper-2);
  border-radius: 6px;
  padding: 1px 6px;
}
.choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.choice {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.choice__eq {
  font-family: var(--serif);
  font-size: 28px;
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.choice__eq .changed {
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 8px;
  padding: 2px 8px;
}
.choice__label {
  font-size: 13px;
  color: var(--ink-soft);
}
.choice .btn { margin-top: 2px; align-self: flex-start; }

/* ---------- picked (confirmed) ---------- */
.picked {
  border: 2px solid var(--teal);
  border-radius: 12px;
  padding: 18px;
  background: var(--teal-soft);
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-start;
}
.picked__eq {
  font-family: var(--serif);
  font-size: 34px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.picked__eq .changed {
  color: var(--teal);
  background: #fff;
  border-radius: 8px;
  padding: 2px 10px;
}
.picked__note {
  margin: 0;
  font-size: 14.5px;
  color: var(--ink-soft);
}
.picked .btn { align-self: flex-start; }
.picked[hidden] { display: none; }

/* ---------- worlds grid ---------- */
.worlds__note {
  margin: 0 0 12px;
  font-size: 14.5px;
  color: var(--ink-soft);
  min-height: 1.2em;
}
.worlds__grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}
.world--primary { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }

/* ---------- ask ---------- */
.ask {
  display: grid;
  gap: 16px;
}
.release {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  background: var(--paper-2);
}
.release legend {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--ink-soft);
  padding: 0 6px;
}
.release__opt {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  cursor: pointer;
}
.release__opt input { accent-color: var(--accent); width: 18px; height: 18px; }

.ask__actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* ---------- buttons ---------- */
.btn {
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 600;
  border-radius: 10px;
  padding: 10px 16px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .08s ease, background .15s ease, box-shadow .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--accent);
  color: #fff;
}
.btn--primary:hover { background: #9a3f24; }
.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn--ghost:hover { background: var(--paper-2); }
.btn--teal {
  background: var(--teal);
  color: #fff;
}
.btn--teal:hover { background: #275c58; }

/* ---------- worlds ---------- */
.worlds {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}
.world {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  background: #fff;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.world__tag {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--accent);
  font-weight: 700;
}
.world__eq {
  font-family: var(--serif);
  font-size: 26px;
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.world__eq .changed {
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 8px;
  padding: 2px 8px;
}
.world__eq .op { padding: 0; font-size: 24px; }
.world__why {
  font-size: 13.5px;
  color: var(--ink-soft);
  margin: 0;
}
.world__actions { margin-top: auto; }

.worlds--empty {
  grid-column: 1 / -1;
  color: var(--ink-soft);
  font-size: 15px;
  padding: 8px 2px;
}

/* ---------- confirmed state ---------- */
.state {
  border: 2px solid var(--teal);
  border-radius: 12px;
  padding: 18px;
  background: var(--teal-soft);
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-start;
}
.state__tag {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--teal);
  font-weight: 700;
}
.state__eq {
  font-family: var(--serif);
  font-size: 34px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.state__eq .changed {
  color: var(--teal);
  background: #fff;
  border-radius: 8px;
  padding: 2px 10px;
}
.state__eq .op { padding: 0; font-size: 30px; }

/* ---------- how ---------- */
.how {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
  font-size: 14.5px;
}
.how ul { margin: 6px 0 0; padding-left: 18px; display: grid; gap: 4px; }
.how code, .how__foot code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .92em;
  background: var(--paper-2);
  border-radius: 5px;
  padding: 1px 5px;
}
.how__foot { margin: 12px 0 0; color: var(--ink-soft); font-size: 13.5px; }

/* ---------- footer ---------- */
.foot {
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: 13px;
  text-align: center;
}
.foot a { color: var(--accent); }

/* ---------- responsive ---------- */
@media (max-width: 560px) {
  .base__row { gap: 10px; }
  .op { padding-bottom: 26px; font-size: 30px; }
  .num { min-width: 78px; }
  .num input, .num__val { font-size: 26px; }
  .worlds, .worlds__grid { grid-template-columns: 1fr; }
  .choices { grid-template-columns: 1fr; }
  .choice__eq { font-size: 24px; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .btn { transition: none; }
  .btn:active { transform: none; }
}