/* ---- CASCADE LAYER ------------------------------------------------------
 *
 * Everything the kit ships sits in ONE layer named `overscan`, so a consumer's
 * own CSS beats it without a specificity fight and without !important. That is
 * close to mandatory for a distributed kit: an app should be able to restyle a
 * panel by writing a plain rule.
 *
 * ⚠️ ONE layer, deliberately, NOT a sub-layer per file. Sub-layers look tidier
 * and would silently reorder the kit against itself: layer order beats
 * specificity, so a high-specificity rule in an early file that currently wins
 * would start losing to a low-specificity rule in a later one. A single layer
 * preserves source order exactly, so nothing inside the kit changes.
 *
 * Unlayered author CSS wins over all of it. That is the point.
 */

@layer overscan {
/* A cursor-addressed terminal screen. */

ov-term {
  display: grid;
  /* 🔴 THE TRACK MAY BE NARROWER THAN THE SCREEN. An `auto` track is at least
   * the screen's min-content, which is every column at full width, so in a
   * narrow cell the whole element (status line included) overflowed its
   * container and scrolled the page sideways: 62 columns in a 324px home page
   * cell on an iPad. The screen already caps itself at 100%; this lets it. */
  grid-template-columns: minmax(0, max-content);
  gap: 6px;
  font-family: var(--ov-font-mono);
  font-size: var(--ov-size-2);
  color: var(--ov-ink);
}

.ov-term__screen {
  position: relative;
  line-height: 1.3;
  padding: 8px 10px;
  background: var(--ov-field);
  border: var(--ov-bezel) solid var(--ov-line-strong);
  /* ⚠️ SCROLLS, NEVER CLIPS. A terminal has a fixed column count, so a screen
   * narrower than its columns keeps them all and scrolls within itself. Hidden
   * would cut columns off with nothing to say they exist. */
  overflow: hidden;
  overflow-x: auto;
  inline-size: max-content;
  max-inline-size: 100%;
}

.ov-term__row {
  display: flex;
  white-space: pre;
  inline-size: calc(var(--ov-term-unit) * var(--ov-term-cols));
}

/* One glyph per cell, as in ov-grid, so nothing accumulates drift. */
.ov-term__c {
  display: inline-block;
  flex: 0 0 auto;
  inline-size: calc(var(--ov-term-unit) * var(--c, 1));
  font-style: normal;
  text-align: center;
}
.ov-term__c.is-frame { color: var(--ov-line-strong); }
.ov-term__c.is-frame[class*="ov-ansi--"] { color: inherit; }

.ov-term__c.is-cursor {
  background: var(--ov-accent);
  color: var(--ov-field);
  animation: ov-term-blink 1.06s steps(1) infinite;
}
@keyframes ov-term-blink { 50% { background: transparent; color: inherit; } }
@media (prefers-reduced-motion: reduce) {
  .ov-term__c.is-cursor { animation: none; }
}

/* Where a refused sequence arrived. An outline, not a glyph: it must not take
 * a cell, or the refusal would itself move the text it is warning about. */
.ov-term__c.is-refused { box-shadow: inset 0 0 0 1px var(--ov-alarm); }

.ov-term__void {
  display: grid;
  place-items: center;
  min-block-size: 6em;
  min-inline-size: 20ch;
  color: var(--ov-alarm);
  text-transform: uppercase;
}

.ov-term__status {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
  font-size: var(--ov-size-1);
  letter-spacing: 1px;
  color: var(--ov-dim);
}
.ov-term__status:empty { display: none; }
.ov-term__status .is-refused { color: var(--ov-alarm); }

/* BEL: the screen flashes once. Never sound-only, and never motion when the
 * reader asked for none: then it is a border change, held briefly. */
ov-term.is-bell .ov-term__screen { animation: ov-term-bell 0.25s steps(1) 1; }
@keyframes ov-term-bell { 0% { border-color: var(--ov-alarm); } }
}