/* ==========================================================================
 * Classic 1984 — portable stylesheet
 *
 * The 1984 Macintosh look as built for Ekybe (src/classic.css) and Agentrix
 * (renderer/classic.css), lifted out of both apps so a third can copy it.
 * The rules, measurements and reasons are in README.md beside this file.
 *
 * Use:
 *   1. Copy this file, classic-1984.js and fonts/ into your app.
 *   2. Put class="c84" on <html> (or on any container you want in the style).
 *   3. Call applyClassic() from classic-1984.js to set the two colours, or
 *      leave them: the defaults are plain black on white.
 *   4. Use the c84-* classes below for components.
 *
 * Every colour here is --ink, --paper, or a mix of the two. Nothing else.
 * ========================================================================== */

/* ---- Fonts ------------------------------------------------------------- */

/* Chicago with the Greek ChicagoFLF never had, drawn on its own 12-pixel grid
   (Ekybe scripts/make-chicago-greek.py). Names, titles, buttons, menus. */
@font-face {
  font-family: 'Chicago';
  src: url('fonts/ChicagoGreek.ttf') format('truetype');
  font-display: swap;
}
/* The same, with upright strokes thinned for running text
   (Ekybe scripts/make-chicago-light.py). Body text, fields. */
@font-face {
  font-family: 'Chicago Light';
  src: url('fonts/ChicagoLight.ttf') format('truetype');
  font-display: swap;
}

/* ---- Tokens ------------------------------------------------------------ */

.c84 {
  /* The only two colours. applyClassic() overwrites them from a hue and a
     strength; these are strength 0, day. */
  --ink: #000;
  --paper: #fff;

  /* Everything else is derived. Percentages are of ink in paper. */
  --c84-muted: color-mix(in srgb, var(--ink) 64%, var(--paper)); /* secondary text, timestamps */
  --c84-tint: color-mix(in srgb, var(--ink) 12%, var(--paper)); /* a soft accent fill */
  --c84-hover: color-mix(in srgb, var(--ink) 9%, var(--paper)); /* row under the pointer */
  --c84-half: color-mix(in srgb, var(--ink) 50%, var(--paper)); /* "away" presence */

  /* Grey does not exist in 1-bit. It is a pattern. */
  --c84-dither: repeating-conic-gradient(var(--ink) 0 25%, var(--paper) 0 50%) 0 0 / 2px 2px;
  --c84-stripes: repeating-linear-gradient(var(--ink) 0 1px, var(--paper) 1px 2px);
  --c84-dots-h: repeating-linear-gradient(90deg, var(--ink) 0 1px, transparent 1px 2px);

  /* Elevation is a hard, unblurred step down and right. */
  --c84-shadow: 2px 2px 0 var(--ink);
  --c84-shadow-sm: 1px 1px 0 var(--ink);

  /* Type */
  --c84-display: 'Chicago', -apple-system, sans-serif;
  --c84-text: 'Chicago Light', -apple-system, 'Helvetica Neue', sans-serif;
  --c84-mono: Monaco, ui-monospace, Menlo, monospace;
  --c84-text-size: 14.5px; /* message / body text at the default step */
  --c84-text-scale: 1; /* the reader's text-size setting multiplies this */

  /* Metrics */
  --c84-window-bar: 28px; /* a window's own title bar */
  --c84-pane-bar: 60px; /* a pane's header inside the window */
  --c84-rule: 1px; /* every border */
  --c84-rule-bold: 2px; /* the line under a title bar */

  color-scheme: light;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--c84-text);
}
.c84[data-c84-night] {
  color-scheme: dark;
}
.c84 ::selection {
  background: var(--ink);
  color: var(--paper);
}

/* Optional, for re-skinning an app that was not built for this: square every
   corner and drop every soft shadow, then bring back the few round things
   explicitly (see README, "Re-skinning an existing app"). */
.c84.c84-reskin *,
.c84.c84-reskin *::before,
.c84.c84-reskin *::after {
  border-radius: 0 !important;
  text-shadow: none !important;
}

/* ---- Type -------------------------------------------------------------- */

.c84-display,
.c84 h1,
.c84 h2,
.c84 h3 {
  font-family: var(--c84-display);
  /* Chicago has one weight. A synthesized bold smears it. */
  font-weight: normal;
  font-synthesis: none;
}
.c84-body {
  font-family: var(--c84-text);
  font-size: calc(var(--c84-text-size) * var(--c84-text-scale));
  line-height: 1.55; /* unitless, so it follows the text size */
}
.c84-meta {
  color: var(--c84-muted);
  font-size: 11px;
}
.c84 code,
.c84-mono {
  font-family: var(--c84-mono);
}
.c84 a {
  color: var(--ink);
  text-decoration: underline;
}

/* ---- Surfaces and patterns ---------------------------------------------- */

.c84-desktop {
  background: var(--c84-dither);
}
.c84-dither {
  background: var(--c84-dither);
}
.c84-stripes {
  background: var(--c84-stripes);
}
.c84-frame {
  outline: 1px solid var(--ink);
}
/* A dotted rule, as between groups in a menu */
.c84-rule-dotted {
  border: 0;
  height: 1px;
  background: var(--c84-dots-h);
}

/* ---- Windows ----------------------------------------------------------- */

.c84-window {
  background: var(--paper);
  border: 1px solid var(--ink);
  box-shadow: var(--c84-shadow);
}

/* The window's own title bar: 28px, stripes between two 7px paper margins,
   the name centred in a paper box, a 2px rule beneath. */
.c84-window-bar {
  position: relative;
  height: var(--c84-window-bar);
  display: flex;
  align-items: center;
  padding: 0 8px;
  border-bottom: var(--c84-rule-bold) solid var(--ink);
  background:
    linear-gradient(var(--paper) 0 7px, transparent 7px calc(100% - 7px), var(--paper) calc(100% - 7px)),
    var(--c84-stripes);
  user-select: none;
  -webkit-user-select: none;
}
.c84-window-title {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  padding: 0 12px;
  background: var(--paper);
  font: 14px/20px var(--c84-display);
  white-space: nowrap;
  cursor: default;
}

/* The three boxes in the bar: close, minimise, zoom. 13px squares, each in a
   3px paper moat so the stripes stop short of it. */
.c84-box {
  display: block;
  flex: none;
  width: 13px;
  height: 13px;
  padding: 0;
  margin: 0 4px;
  border: 1px solid var(--ink);
  background: var(--paper);
  outline: 3px solid var(--paper);
  cursor: default;
}
.c84-box + .c84-box {
  margin-left: 2px;
}
.c84-box.is-mini {
  background: linear-gradient(var(--ink), var(--ink)) center calc(100% - 2px) / 7px 2px no-repeat, var(--paper);
}
.c84-box.is-zoom {
  background:
    linear-gradient(var(--ink), var(--ink)) 0 6px / 7px 1px no-repeat,
    linear-gradient(var(--ink), var(--ink)) 6px 0 / 1px 7px no-repeat,
    var(--paper);
}
/* Pressed: the close box shows its star, the others fill */
.c84-box.is-close:active {
  background:
    linear-gradient(var(--ink), var(--ink)) center / 1px 100% no-repeat,
    linear-gradient(var(--ink), var(--ink)) center / 100% 1px no-repeat,
    linear-gradient(45deg, transparent 46%, var(--ink) 46% 54%, transparent 54%),
    linear-gradient(-45deg, transparent 46%, var(--ink) 46% 54%, transparent 54%),
    var(--paper);
}
.c84-box.is-mini:active,
.c84-box.is-zoom:active {
  background: var(--ink);
}

/* A pane's header inside the window (sidebar, conversation, thread): 60px,
   a 9px band of stripes along the top, a 2px rule beneath. Every pane header
   is exactly 60px so their rules meet in one line across the window. */
.c84-pane-bar {
  height: var(--c84-pane-bar);
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 16px;
  background: var(--c84-stripes) top left / 100% 9px no-repeat, var(--paper);
  border-bottom: var(--c84-rule-bold) solid var(--ink);
  font-family: var(--c84-display);
  flex: none;
}
/* Directly under a window bar the band would be stripes on stripes: drop it,
   and let the bold rule alone divide. */
.c84-window-bar + * .c84-pane-bar,
.c84-pane-bar.is-plain {
  background: var(--paper);
}

/* ---- Lists ------------------------------------------------------------- */

.c84-row {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 5px 12px;
  cursor: default;
}
.c84-row:hover {
  background: var(--c84-hover);
}
/* The selected row is drawn in reverse — everything inside it too */
.c84-row.is-selected,
.c84-row.is-selected * {
  background-color: var(--ink);
  color: var(--paper);
}
.c84-row.is-selected .c84-badge {
  background: var(--paper);
  color: var(--ink);
}
.c84-row.is-selected .c84-dot {
  box-shadow: inset 0 0 0 1px var(--paper);
}

/* Unread count: ink pill, the one rounded rectangle besides the default
   button */
.c84-badge {
  display: inline-grid;
  place-items: center;
  min-width: 18px;
  height: 16px;
  padding: 0 5px;
  border-radius: 6px;
  background: var(--ink);
  color: var(--paper);
  font: 11px/1 var(--c84-display);
}

/* Presence: round, the only circles there are */
.c84-dot {
  width: 9px;
  height: 9px;
  flex: none;
  border-radius: 50%;
  background: var(--paper);
  box-shadow: inset 0 0 0 1px var(--ink);
}
.c84-dot.is-active {
  background: var(--ink);
}
.c84-dot.is-away {
  background: var(--c84-half);
}

/* ---- Buttons ----------------------------------------------------------- */

.c84-button {
  appearance: none;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
  font: 13px/18px var(--c84-display);
  padding: 4px 14px;
  cursor: default;
}
.c84-button:active,
.c84-button:hover:not(:disabled) {
  background: var(--ink);
  color: var(--paper);
}
/* The default button (what Return presses): rounded 8px, 2px border, and the
   thick outer ring 2px out — the one ornament 1984 allowed itself. */
.c84-button.is-default {
  border: 2px solid var(--ink);
  border-radius: 8px;
  box-shadow: 0 0 0 2px var(--paper), 0 0 0 5px var(--ink);
  margin: 5px;
}
/* Disabled is dimmed, not hidden */
.c84-button:disabled {
  color: var(--c84-muted);
  border-color: var(--c84-muted);
  background: var(--paper);
}
.c84-button.is-default:disabled {
  box-shadow: none;
  border-radius: 8px;
}

/* ---- Fields ------------------------------------------------------------ */

.c84-field {
  appearance: none;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--c84-text);
  font-size: calc(var(--c84-text-size) * var(--c84-text-scale));
  padding: 6px 8px;
}
.c84-field::placeholder {
  color: var(--c84-muted);
}
/* Not in the 1984 system; this is ours. A dotted ink outline reads as
   "you are here" without adding a colour. */
.c84 :focus-visible {
  outline: 1px dotted var(--ink);
  outline-offset: 2px;
}
.c84 input:focus-visible,
.c84 textarea:focus-visible {
  outline-offset: -3px;
}

.c84 input,
.c84 textarea,
.c84 select {
  accent-color: var(--ink);
}
.c84 input[type='checkbox'] {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  margin: 0;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: var(--paper);
  flex: none;
  cursor: default;
}
/* Checked is an X corner to corner, as it was */
.c84 input[type='checkbox']:checked {
  background:
    linear-gradient(45deg, transparent calc(50% - 0.8px), var(--ink) calc(50% - 0.8px) calc(50% + 0.8px), transparent calc(50% + 0.8px)),
    linear-gradient(-45deg, transparent calc(50% - 0.8px), var(--ink) calc(50% - 0.8px) calc(50% + 0.8px), transparent calc(50% + 0.8px)),
    var(--paper);
}
.c84 input[type='radio'] {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  margin: 0;
  border: 1px solid var(--ink);
  border-radius: 50%;
  background: var(--paper);
  cursor: default;
}
.c84 input[type='radio']:checked {
  background: radial-gradient(var(--ink) 0 3px, transparent 3.5px), var(--paper);
}
/* Slider: a dithered track, a square paper thumb with a 1px hard shadow */
.c84 input[type='range'] {
  appearance: none;
  -webkit-appearance: none;
  height: 12px;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: var(--c84-dither);
}
.c84 input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 11px;
  height: 20px;
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 0;
  box-shadow: var(--c84-shadow-sm);
}
.c84 input[type='range']::-moz-range-thumb {
  width: 11px;
  height: 20px;
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 0;
  box-shadow: var(--c84-shadow-sm);
}

/* ---- Menus ------------------------------------------------------------- */

/* A 1984 menu — pull-down, context menu, submenu — as Agentrix approved it
   (version B, 4 Oct 2026): Chicago 13px, 27px rows (21px until 5 Oct 2026: cramped), a thin ink edge with a
   hard shadow, the row under the pointer reversed, dotted separators, and the
   app's line icons kept in a column of their own. showMenu() in
   classic-1984.js builds this markup, places it and runs the keyboard. */
.c84-menu {
  position: fixed;
  z-index: 10000;
  min-width: 200px;
  max-width: 360px;
  padding: 4px 0;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--ink);
  box-shadow: var(--c84-shadow);
  font: 13px/1 var(--c84-display);
  user-select: none;
  -webkit-user-select: none;
}
/* A menu shown in place (a specimen, a menu bar's open title) */
.c84-menu.is-static {
  position: static;
}
.c84-menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 27px;
  padding: 0 14px 0 12px;
  white-space: nowrap;
  cursor: default;
}
.c84-menu-item.is-on,
.c84-menu.is-static .c84-menu-item:hover:not([aria-disabled='true']) {
  background: var(--ink);
  color: var(--paper);
}
/* Disabled is dimmed, never hidden: 40% ink, lighter than muted text */
.c84-menu-item[aria-disabled='true'] {
  color: color-mix(in srgb, var(--ink) 40%, var(--paper));
}
/* The icon column: a line icon used as a mask, so it takes the row's colour
   and reverses with it. A row without an icon keeps the column empty, so the
   labels stay in line. */
.c84-menu-icon {
  flex: none;
  width: 16px;
  height: 14px;
  background: currentColor;
  -webkit-mask: no-repeat center / contain;
  mask: no-repeat center / contain;
}
.c84-menu-icon:not([style]) {
  background: none;
}
/* Inline SVG icons work too: they draw in currentColor */
.c84-menu-icon > svg {
  display: block;
  width: 100%;
  height: 100%;
}
.c84-menu-icon:has(> svg) {
  background: none;
}
/* The tick column, present only in menus that have a checkable item */
.c84-menu-check {
  flex: none;
  width: 11px;
  display: grid;
  place-items: center;
}
.c84-menu-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
}
/* A keyboard shortcut, right-aligned, as 1984 menus showed ⌘-keys */
.c84-menu-key {
  flex: none;
  margin-left: 18px;
}
/* The submenu arrow: a solid triangle pointing right */
.c84-menu-sub {
  flex: none;
  margin-left: 14px;
  display: grid;
  place-items: center;
}
.c84-menu-sep {
  height: 1px;
  margin: 5px 0;
  background: var(--c84-dots-h);
}
/* A greyed heading inside a menu (a group's name) */
.c84-menu-head {
  padding: 6px 14px 3px 12px;
  font: 11px var(--c84-display);
  color: var(--c84-muted);
}
/* A letter that runs the row while the menu is open, in a box like a key cap.
   Plain letters only (§8.7): ⌘Q, ⌘R and ⌘C already belong to the app. */
.c84-menu-cap {
  flex: none;
  margin-left: 18px;
  min-width: 16px;
  box-sizing: border-box;
  padding: 0 3px;
  border: 1px solid currentColor;
  font: 11px/14px var(--c84-display);
  text-align: center;
}
/* A choice of one, inside a menu (a notification level): boxed cells in a
   row, the chosen one reversed */
.c84-menu-seg {
  display: flex;
  margin: 3px 12px 6px;
  border: 1px solid var(--ink);
}
.c84-menu-seg > * {
  flex: 1;
  text-align: center;
  font: 12px/22px var(--c84-display);
  cursor: default;
}
.c84-menu-seg > * + * {
  border-left: 1px solid var(--ink);
}
.c84-menu-seg > .is-on,
.c84-menu-seg > [aria-checked='true'] {
  background: var(--ink);
  color: var(--paper);
}

/* ---- Dialogs ----------------------------------------------------------- */

/* The double border: 1px ink, 3px paper, 2px ink, then the hard shadow */
.c84-dialog {
  background: var(--paper);
  border: 1px solid var(--ink);
  box-shadow:
    inset 0 0 0 3px var(--paper),
    inset 0 0 0 5px var(--ink),
    var(--c84-shadow);
  padding: 16px 18px;
}
/* Alerts, confirmations and prompts (showDialog, showPrompt): over the window,
   in its upper part, with nothing dimmed behind. */
.c84-dialog-layer {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 16vh;
}
.c84-dialog.is-alert {
  width: min(440px, calc(100vw - 40px));
  color: var(--ink);
}
.c84-dialog-message {
  font: 15px/1.35 var(--c84-display);
}
.c84-dialog-detail {
  margin-top: 8px;
  font: 13px/1.45 var(--c84-text);
  white-space: pre-wrap;
}
.c84-dialog-field {
  display: block;
  width: 100%;
  box-sizing: border-box;
  margin-top: 12px;
}
.c84-dialog-buttons {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
}
.c84-dialog-buttons .c84-button {
  min-width: 76px;
  white-space: nowrap;
}

/* ---- Scroll bars ------------------------------------------------------- */

/* Dithered track, square paper thumb, square ends. Pseudo-elements, so no
   blanket radius reset reaches them: they are set here explicitly. */
.c84 ::-webkit-scrollbar {
  width: 14px;
  height: 14px;
}
.c84 ::-webkit-scrollbar-track {
  background: var(--c84-dither);
  border-left: 1px solid var(--ink);
  border-radius: 0;
}
.c84 ::-webkit-scrollbar-thumb {
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 0;
  min-height: 24px;
}
.c84 ::-webkit-scrollbar-corner {
  background: var(--paper);
}

/* ---- People's pictures ------------------------------------------------- */

.c84-avatar {
  width: 34px;
  height: 34px;
  flex: none;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--ink);
  font: 13px var(--c84-display);
  background: var(--paper);
  color: var(--ink);
}
.c84-avatar > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
/* Ink only: initials in a 3px dithered frame */
.c84-avatar.is-ink {
  border: 3px solid transparent;
  outline: 1px solid var(--ink);
  outline-offset: -1px;
  background: linear-gradient(var(--paper), var(--paper)) padding-box, var(--c84-dither) border-box;
}
/* 1-bit photo: the ink shows through a dithered mask (classic-1984.js) */
.c84-avatar.is-bit > i {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--ink);
  -webkit-mask-size: 100% 100%;
  mask-size: 100% 100%;
  image-rendering: pixelated;
}
.c84-row.is-selected .c84-avatar.is-ink,
.c84-row.is-selected .c84-avatar.is-ink * {
  background-color: transparent;
  color: var(--ink);
}

/* ---- Toast / notice ---------------------------------------------------- */

.c84-notice {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--paper);
  border: 1px solid var(--ink);
  box-shadow: var(--c84-shadow);
  font: 13px/18px var(--c84-display);
}