/* ==========================================================================
   Gonit Ongon — Scientific Calculator island styles
   Loaded after calculator.css. Tokens from design-system.css (via shared.css).
   Hierarchy per spec: numeric = neutral · operators = emerald · scientific =
   slate tint · actions (AC/DEL/Ans) = amber · AI = deep slate.
   The old scientific markup stays in the DOM (calculator.js binds to it at
   load) but is hidden; the island renders in its place.
   ========================================================================== */

/* Hide the legacy scientific calculator; keep it in the DOM for calculator.js */
#scientific-tab > *:not(#sci-calc-mount) { display: none !important; }

#sci-calc-mount { width: 100%; }

/* Widen the page container (calculator.css caps it at 480px) — the ClassWiz
   keypad needs room, and the Desmos graphing tab benefits too. */
.calculator-container { max-width: min(1160px, 96vw); }

.sc-calc {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 48px;
  gap: var(--space-4);
  max-width: 1160px;
  margin: 0 auto;
  align-items: start;
  transition: grid-template-columns var(--dur-slow) var(--ease-spring);
}
.sc-calc--ai-open { grid-template-columns: minmax(0, 1fr) 320px; }

.sc-main { min-width: 0; }

/* ── Display: high-contrast dual-line “LCD” ─────────────────────────────── */
.sc-display {
  background: var(--color-header);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-4);
  min-height: 118px;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  position: relative;
}
.sc-display__expr {
  min-height: 2.2rem;
  font-size: 1.25rem;
  color: var(--slate-50);
  overflow-x: auto;
  overflow-y: hidden;
}
/* MathQuill field on the dark display */
.sc-mq { display: block; min-width: 100%; }
.sc-mq.mq-editable-field,
.sc-mq .mq-root-block {
  border: none !important;
  box-shadow: none !important;
  color: var(--slate-50) !important;
  font-size: 1.3rem;
}
.sc-mq .mq-cursor { border-color: var(--emerald-500) !important; }
.sc-mq.mq-focused { box-shadow: none !important; }
.sc-fallback-input {
  width: 100%;
  background: transparent !important;
  border: none !important;
  color: var(--slate-50) !important;
  font-size: 1.15rem;
  font-family: var(--font-mono);
  box-shadow: none !important;
  padding: 0 !important;
}
.sc-fallback-input::placeholder { color: var(--slate-500); }

.sc-display__result {
  font-size: clamp(1.7rem, 1.2rem + 2vw, 2.4rem);
  font-weight: var(--weight-bold);
  color: var(--emerald-500);
  text-align: right;
  font-variant-numeric: tabular-nums;
  line-height: 1.15;
  overflow-x: auto;
  overflow-y: hidden;
}
.sc-display__result.is-error {
  color: var(--rose-500);
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
}
.sc-display__meta {
  position: absolute;
  top: var(--space-3);
  right: var(--space-4);
  display: flex;
  gap: var(--space-2);
}
.sc-badge {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--slate-400);
  border: 1px solid var(--slate-700);
  border-radius: var(--radius-sm);
  padding: 1px 7px;
  letter-spacing: 0.04em;
}
.sc-badge.is-on { color: var(--emerald-500); border-color: var(--emerald-700); }
.sc-badge--shift { color: var(--amber-500); border-color: var(--amber-600); }

/* ── Keypad: ClassWiz 7 columns, squircle keys, SHIFT sub-labels ────────── */
.sc-keypad {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: var(--space-2);
}
.sc-key {
  position: relative;
  height: 54px;
  border-radius: var(--radius-xl); /* squircle / rounded-2xl */
  border: 1px solid var(--color-border);
  font-family: var(--font-sans);
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  transition: transform var(--dur-fast) var(--ease-spring),
              box-shadow var(--dur-fast) var(--ease-standard),
              background-color var(--dur-fast) var(--ease-standard),
              filter var(--dur-fast) var(--ease-standard);
}

/* Casio-style printed second function, top-right of the key */
.sc-key__shift {
  position: absolute;
  top: 3px;
  right: 7px;
  font-size: 10px;
  font-weight: var(--weight-bold);
  line-height: 1;
  color: var(--amber-600);
  opacity: 0.9;
  pointer-events: none;
}
.sc-key__main { display: block; }

/* SHIFT engaged: second functions take the stage */
.sc-keypad--shift .sc-key--has-shift {
  border-color: var(--amber-600);
  box-shadow: 0 0 0 1px var(--amber-600) inset;
}
.sc-keypad--shift .sc-key--has-shift .sc-key__shift {
  font-size: 12px;
  opacity: 1;
}
.sc-keypad--shift .sc-key--has-shift .sc-key__main { opacity: 0.4; }

/* The SHIFT key itself */
.sc-key--shift {
  background: var(--color-surface);
  color: var(--amber-600);
  border: 1px solid var(--amber-600);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: 0.04em;
}
.sc-key--shift.is-shift-on {
  background: var(--amber-600);
  color: #fff;
  box-shadow: var(--btn-inset);
}
.sc-key:hover { transform: translateY(-1px); box-shadow: var(--shadow-pop); }
.sc-key:active { transform: translateY(1px) scale(0.97); box-shadow: none; }
.sc-key:focus-visible { outline: none; box-shadow: var(--focus-ring); }

/* numeric — clean neutral, dark text */
.sc-key--num { background: var(--color-surface); color: var(--color-ink); }
.sc-key--num:hover { background: var(--color-surface-2); }

/* basic operators + equals — emerald accent */
.sc-key--op,
.sc-key--eq {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
  box-shadow: var(--btn-inset);
}
.sc-key--op:hover,
.sc-key--eq:hover { background: var(--color-accent-hover); box-shadow: var(--btn-inset), var(--shadow-accent-hover); }
.sc-key--eq { font-size: var(--text-2xl); }

/* scientific functions — muted slate tint */
.sc-key--fn {
  background: var(--color-surface-2);
  color: var(--slate-700);
  font-size: var(--text-base);
}
.sc-key--fn:hover { background: var(--color-surface); color: var(--color-accent); border-color: var(--color-accent); }

/* action keys (AC / DEL / Ans) — warm amber */
.sc-key--act {
  background: var(--color-warning-soft);
  color: var(--amber-600);
  border-color: var(--color-border);
  font-size: var(--text-base);
}
.sc-key--act:hover { background: var(--amber-100); border-color: var(--amber-600); }

/* mode toggle (Rad/Deg) — slate pill look */
.sc-key--mode {
  background: var(--color-header);
  color: var(--slate-50);
  border-color: var(--color-header);
  font-size: var(--text-sm);
}
.sc-key--mode:hover { filter: brightness(1.2); }

/* AI explain — deep slate with emerald glyph energy */
.sc-key--ai {
  background: var(--color-header);
  color: var(--emerald-500);
  border-color: var(--color-header);
  font-weight: var(--weight-bold);
  letter-spacing: 0.02em;
}
.sc-key--ai:hover { filter: brightness(1.2); box-shadow: var(--shadow-accent-hover); }

/* ── AI Math Assistant sidebar ──────────────────────────────────────────── */
.sc-ai {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 118px;
  display: flex;
  flex-direction: column;
}
.sc-ai__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface-2);
  border-bottom: 1px solid var(--color-border);
}
.sc-ai__head h3 {
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  color: var(--color-ink);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sc-ai:not(.is-open) .sc-ai__head h3 { display: none; }
.sc-ai:not(.is-open) .sc-ai__head { justify-content: center; border-bottom: none; background: var(--color-surface); }
.sc-ai__close {
  width: 30px; height: 30px;
  display: grid; place-items: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-ink-2);
  cursor: pointer;
  transition: var(--transition-base);
  flex-shrink: 0;
}
.sc-ai__close:hover { color: var(--color-accent); border-color: var(--color-accent); }

.sc-ai__body { padding: var(--space-3); overflow-y: auto; max-height: 520px; }
.sc-ai__section { margin-bottom: var(--space-4); }
.sc-ai__section h4 {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-muted);
  margin: 0 0 var(--space-2);
}
.sc-ai__text, .sc-ai__loading {
  font-size: var(--text-sm);
  color: var(--color-ink-2);
  line-height: var(--leading-normal);
  margin: 0;
}
.sc-ai__alts { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: var(--space-1); }
.sc-ai__alts li {
  display: flex; justify-content: space-between; align-items: baseline; gap: var(--space-2);
  font-size: var(--text-sm); color: var(--color-ink-2);
}
.sc-ai__alts code {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink);
  background: var(--color-surface-2);
  border-radius: var(--radius-sm);
  padding: 1px 6px;
  overflow-wrap: anywhere;
}
.sc-ai__history { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: var(--space-1); }
.sc-ai__history button {
  width: 100%;
  display: flex; justify-content: space-between; gap: var(--space-2);
  background: var(--color-surface-2);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  padding: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  color: var(--color-ink-2);
  cursor: pointer;
  transition: var(--transition-base);
  text-align: left;
}
.sc-ai__history button:hover { border-color: var(--color-accent); background: var(--color-surface); }
.sc-hist-expr { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 60%; }
.sc-hist-res { font-variant-numeric: tabular-nums; color: var(--color-ink); font-weight: var(--weight-semibold); }

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 860px) {
  .sc-calc, .sc-calc--ai-open { grid-template-columns: 1fr; }
  .sc-ai { order: 2; }
  .sc-ai:not(.is-open) { min-height: 0; }
  .sc-ai:not(.is-open) .sc-ai__head { padding: var(--space-2); }
}
@media (max-width: 640px) {
  .sc-key { height: 46px; font-size: var(--text-base); }
  .sc-key--fn, .sc-key--act, .sc-key--mode { font-size: var(--text-sm); }
  .sc-key__shift { font-size: 9px; top: 2px; right: 4px; }
  .sc-keypad { gap: var(--space-1); }
  .sc-display { padding: var(--space-3) var(--space-4); }
}

/* Embedded calc-panel mode (whiteboard iframe ?calc=1): tighten chrome */
.calc-panel-mode .sc-calc { max-width: none; }
.calc-panel-mode .sc-display { border-radius: var(--radius-lg); }