/* ==========================================================================
   Shack Stack · Studio design system (final layer)
   Order: 1 tokens · 2 base controls · 3 app chrome · 4 tools panel ·
          5 canvas frame · 6 desks, cards and grips · 7 dialogs ·
          8 responsive · 9 accessibility · 10 print
   Geometry, data and seat placement belong to layout.js / photo-layout.js.
   Nothing here changes desk coordinates, student order or stored data.
   Legacy layers (themes, workspace, vault, readable, refinements) still own
   structural layout and print; this file owns colour, type, spacing, state.
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root {
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, Roboto, "Helvetica Neue", sans-serif;
  /* spacing scale (4px grid) */
  --s1: 4px; --s2: 8px; --s3: 12px; --s4: 16px; --s5: 20px; --s6: 24px; --s8: 32px;
  /* radius scale */
  --r-xs: 6px; --r-sm: 8px; --r-md: 12px; --r-lg: 16px; --r-xl: 22px; --r-pill: 999px;
  /* type scale: nothing informational below 12px */
  --t-cap: 12px; --t-body: 13px; --t-ui: 14px; --t-title: 15px; --t-panel: 19px;
  --ctl: 36px; /* control height */
  --ease: cubic-bezier(.2, .7, .2, 1); --dur: .14s;
  --icon-masks: none;
}
body[data-room-theme] {
  color-scheme: light;
  --bg: #f1f0ed;          /* app surround */
  --surface: #fbfaf8;     /* chrome and panels */
  --raised: #ffffff;      /* controls, cards */
  --sunken: #ebeae6;      /* wells, segmented tracks */
  --line: #e2e0db;
  --line-strong: #cbc8c1;
  --ink: #1d1d1f;
  --muted: #666670;
  --warn-bg: #fff3d9; --warn-ink: #7a5513; --warn-line: #e3c987;
  --bad: #b3322d; --bad-bg: #fdeceb; --ok: #2f7d4f;
  --shadow-1: 0 1px 2px #1d1d1f14, 0 1px 1px #1d1d1f0a;
  --shadow-2: 0 2px 8px #1d1d1f14, 0 1px 2px #1d1d1f12;
  --shadow-3: 0 24px 64px #1d1d1f33, 0 4px 14px #1d1d1f14;
  --scrim: #1d1d1f59;
  --chev: url(assets/ui-chevron-muted.svg?v=90);
  /* legacy variable names kept so earlier layers and palette code keep working */
  --paper: var(--bg); --panel: var(--surface); --control: var(--raised);
  --chrome: var(--surface); --chrome-text: var(--ink);
  --seat-bg: #ffffff; --seat-ink: #1d1d1f; --gold: var(--ui-accent, #3867a8);
  font-family: var(--font); background: var(--bg); color: var(--ink);
}
body[data-mode=dark] {
  color-scheme: dark;
  --bg: #131315;
  --surface: #1c1c1f;
  --raised: #27272b;
  --sunken: #111113;
  --line: #333338;
  --line-strong: #4a4a51;
  --ink: #f4f4f6;
  --muted: #a9a9b2;
  --warn-bg: #3c3320; --warn-ink: #efce8b; --warn-line: #6b5830;
  --bad: #ff9d96; --bad-bg: #3a2220; --ok: #7fd19f;
  --shadow-1: 0 1px 2px #0006;
  --shadow-2: 0 2px 10px #0006, 0 1px 2px #0006;
  --shadow-3: 0 28px 70px #000a, 0 4px 16px #0006;
  --scrim: #000a;
  --chev: url(assets/ui-chevron-muted-dark.svg?v=90);
  --seat-bg: #393a41; --seat-ink: #f6f6f8;
}

/* Monochrome SVG icons: one mask per icon, tinted by currentColor. */
.ui-icon, .toolbar-symbol, .subject-symbol { flex: none; background: currentColor; mask-position: center; -webkit-mask-position: center; mask-repeat: no-repeat; -webkit-mask-repeat: no-repeat; mask-size: contain; -webkit-mask-size: contain; filter: none !important; }
.ui-icon { display: inline-block; width: 16px; height: 16px; }
.toolbar-symbol { display: inline-block; width: 17px; height: 17px; mask-image: var(--symbol); -webkit-mask-image: var(--symbol); }
.subject-symbol { display: inline-block; width: 24px; height: 24px; mask-image: var(--symbol); -webkit-mask-image: var(--symbol); }
.subject-symbol[hidden], .class-icon-tile[hidden] { display: none !important; }
#headingIcon.subject-symbol { background: currentColor !important; width: 22px; height: 22px; border: 0; padding: 0; border-radius: 0; }
.icon-undo { mask-image: url(assets/ui-undo.svg?v=90); -webkit-mask-image: url(assets/ui-undo.svg?v=90); }
.icon-redo { mask-image: url(assets/ui-redo.svg?v=90); -webkit-mask-image: url(assets/ui-redo.svg?v=90); }
.icon-plus { mask-image: url(assets/ui-plus.svg?v=90); -webkit-mask-image: url(assets/ui-plus.svg?v=90); }
.icon-minus { mask-image: url(assets/ui-minus.svg?v=90); -webkit-mask-image: url(assets/ui-minus.svg?v=90); }
.icon-working { mask-image: url(assets/ui-working.svg?v=90); -webkit-mask-image: url(assets/ui-working.svg?v=90); }
.icon-fit-desks { mask-image: url(assets/ui-fit-desks.svg?v=90); -webkit-mask-image: url(assets/ui-fit-desks.svg?v=90); }
.icon-fit-room { mask-image: url(assets/ui-fit-room.svg?v=90); -webkit-mask-image: url(assets/ui-fit-room.svg?v=90); }

/* ---------- 2. Base controls ---------- */
body, button, input, select, textarea, summary, h1, h2, h3, .brand, .board, .canvas-controls, .desk-handle, #panelTitle, .teacher-label, .tag {
  font-family: var(--font) !important; letter-spacing: normal;
}
body { font-size: var(--t-body); line-height: 1.45; -webkit-font-smoothing: antialiased; }
h2 { font-size: var(--t-title); font-weight: 650; text-transform: none; letter-spacing: 0; }
label { font-size: var(--t-cap); font-weight: 600; color: var(--ink); }
.hint, p.hint { font-size: var(--t-cap); line-height: 1.5; color: var(--muted); }

button, input, select, textarea {
  min-height: var(--ctl); border-radius: var(--r-sm); font-size: var(--t-body);
  border: 1px solid var(--line); background: var(--raised); color: var(--ink); box-shadow: none;
}
button { font-weight: 550; display: inline-flex; align-items: center; justify-content: center; gap: 7px; padding: 0 14px; transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease); }
button:hover:not(:disabled) { background: color-mix(in srgb, var(--ink) 4%, var(--raised)); border-color: var(--line-strong); }
button:active:not(:disabled) { background: color-mix(in srgb, var(--ink) 8%, var(--raised)); transform: translateY(.5px); }
button:disabled, select:disabled, input:disabled { opacity: .5; cursor: default; }
button.primary {
  background: var(--ui-accent) !important; color: var(--ui-accent-ink) !important; border-color: transparent !important; box-shadow: var(--shadow-1);
}
button.primary:hover:not(:disabled) { filter: brightness(.94); }
button.primary:active:not(:disabled) { filter: brightness(.88); }
.danger { color: var(--bad) !important; }
button.danger:hover:not(:disabled) { background: var(--bad-bg); border-color: color-mix(in srgb, var(--bad) 35%, var(--line)); }
.wide { width: 100%; }
input, textarea { padding: 0 var(--s3); }
textarea { padding: var(--s3); line-height: 1.5; min-height: 112px; }
input:hover, select:hover, textarea:hover { border-color: var(--line-strong); }
input[aria-invalid=true], textarea[aria-invalid=true] { border-color: var(--bad); box-shadow: 0 0 0 3px color-mix(in srgb, var(--bad) 16%, transparent); }
select {
  appearance: none; -webkit-appearance: none; padding: 0 30px 0 var(--s3); cursor: pointer;
  background-image: var(--chev); background-repeat: no-repeat; background-position: right 10px center; background-size: 14px;
}
input[type=checkbox], input[type=radio] { min-height: 0; accent-color: var(--ui-accent); }
input[type=color] { padding: 3px; cursor: pointer; }
.row { display: flex; gap: var(--s2); }

/* Disclosure rows share one chevron and one rhythm. */
summary { list-style: none; cursor: pointer; font-size: var(--t-body); font-weight: 600; color: var(--ink); line-height: 1.4; display: flex; align-items: center; gap: var(--s2); min-height: 28px; border-radius: var(--r-xs); }
summary::-webkit-details-marker { display: none; }
summary::after { content: ""; margin-left: auto; width: 14px; height: 14px; flex: none; background: var(--muted); mask: url(assets/ui-chevron.svg?v=90) center / contain no-repeat; -webkit-mask: url(assets/ui-chevron.svg?v=90) center / contain no-repeat; transform: rotate(-90deg); transition: transform var(--dur) var(--ease); }
details[open] > summary::after { transform: rotate(0); }
summary:hover { color: var(--ui-accent); }
/* Legacy ID selectors recolour some summaries; the final system is one style for every disclosure row. */
aside summary, aside details > summary, #roomControls > details > summary, #manualEntry > summary, .compass-import > summary, .print-options > summary, .backup-menu > summary, .saved-rooms > summary { font-size: var(--t-body) !important; font-weight: 600 !important; color: var(--ink) !important; letter-spacing: 0 !important; text-transform: none !important; }
aside summary:hover { color: var(--ui-accent) !important; }

/* ---------- 3. App chrome ---------- */
header {
  height: 56px; min-height: 56px; padding: 0 var(--s5); gap: var(--s4); align-items: center;
  background: var(--surface); color: var(--ink); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; font-size: 17px; font-weight: 650; white-space: nowrap; letter-spacing: -.2px !important; }
.brand > div { line-height: 1.1; }
.brand small { display: block; font-size: var(--t-cap); font-weight: 500; color: var(--muted); margin-top: 3px; letter-spacing: 0; }
.brand .brand-mark { display: flex; overflow: hidden; width: 38px; height: 38px; padding: 2px; margin: 0; border-radius: 11px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-1); }
.brand .brand-mark img { display: block; width: 100%; height: 100%; object-fit: contain; border-radius: 9px; filter: none !important; opacity: 1; }
.brand .brand-mark i { display: block; width: 8px; height: 8px; box-sizing: border-box; }
.sub { display: none; }

.header-room { flex: 0 1 auto; min-width: 160px; max-width: 460px; gap: var(--s2); align-items: center; position: relative; }
.header-room label { display: none; }
.class-icon-tile { display: grid; place-items: center; flex: none; width: 36px; height: 36px; border-radius: 10px; background: color-mix(in srgb, var(--icon-tint, var(--ui-accent)) 12%, var(--raised)); color: var(--icon-tint, var(--ui-accent)); }
.header-room select {
  height: 38px; min-height: 38px; flex: 0 1 auto; min-width: 0; max-width: 100%; font-size: var(--t-title); font-weight: 600; line-height: 1.3;
  border-color: transparent; background-color: transparent; padding-left: var(--s2); text-overflow: ellipsis;
}
.header-room select:hover { background-color: color-mix(in srgb, var(--ink) 5%, transparent); border-color: transparent; }

.header-actions { gap: var(--s2); margin-left: 0; }
.header-actions button { min-height: 34px; height: 34px; font-size: var(--t-body); padding: 0 var(--s3); }
.header-actions #darkMode::before, .header-actions #print::before { content: ""; width: 16px; height: 16px; background: currentColor; mask: center / contain no-repeat; -webkit-mask: center / contain no-repeat; }
.header-actions #darkMode::before { mask-image: url(assets/ui-moon.svg?v=90); -webkit-mask-image: url(assets/ui-moon.svg?v=90); }
.header-actions #darkMode[aria-pressed=true]::before { mask-image: url(assets/ui-sun.svg?v=90); -webkit-mask-image: url(assets/ui-sun.svg?v=90); }
.header-actions #print::before { mask-image: url(assets/ui-printer.svg?v=90); -webkit-mask-image: url(assets/ui-printer.svg?v=90); }
.header-actions #print, .header-actions #darkMode { background: var(--raised) !important; color: var(--ink) !important; border: 1px solid var(--line) !important; box-shadow: var(--shadow-1); filter: none; }
.header-actions #print:hover, .header-actions #darkMode:hover { background: color-mix(in srgb, var(--ink) 4%, var(--raised)) !important; border-color: var(--line-strong) !important; }

/* Save state: always visible; a failed save is impossible to miss. */
.tag, header .tag {
  order: 2; margin-left: auto; display: inline-flex; align-items: center; gap: 6px; flex: none; max-width: none; white-space: nowrap;
  height: 28px; padding: 0 10px 0 8px; border: 0; border-radius: var(--r-pill); background: transparent;
  font-size: var(--t-cap); font-weight: 550; line-height: 1; color: var(--muted);
}
.header-actions { order: 3; }
.tag::before { content: ""; width: 15px; height: 15px; flex: none; background: currentColor; mask: url(assets/ui-saved.svg?v=90) center / contain no-repeat; -webkit-mask: url(assets/ui-saved.svg?v=90) center / contain no-repeat; }
.tag[data-state=saved]::before { color: var(--ok); }
.tag[data-state=dirty] { color: var(--warn-ink); background: var(--warn-bg); }
.tag[data-state=dirty]::before { mask-image: url(assets/ui-alert.svg?v=90); -webkit-mask-image: url(assets/ui-alert.svg?v=90); color: var(--warn-ink); }
.tag[data-state=error] { color: var(--bad); background: var(--bad-bg); font-weight: 650; box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--bad) 35%, transparent); }
.tag[data-state=error]::before { mask-image: url(assets/ui-alert.svg?v=90); -webkit-mask-image: url(assets/ui-alert.svg?v=90); color: var(--bad); }

/* Navigation: one segmented control for tools, one cluster for actions. */
.app-nav { background: var(--surface); border-bottom: 1px solid var(--line); padding: 0 var(--s5); height: 48px; min-height: 48px; gap: var(--s4); align-items: center; box-shadow: none; }
.nav-tabs { display: flex; gap: 2px; padding: 2px; border-radius: 10px; background: var(--sunken); }
.app-nav .nav-tabs button {
  display: flex; align-items: center; justify-content: center; gap: 7px; min-height: 30px; height: 30px; padding: 0 var(--s3);
  border: 0; border-radius: 8px; background: transparent; color: var(--muted) !important; font-size: var(--t-body); font-weight: 550; box-shadow: none;
}
.app-nav .nav-tabs button:hover:not(:disabled) { color: var(--ink) !important; background: color-mix(in srgb, var(--ink) 5%, transparent); }
.app-nav .nav-tabs button[aria-pressed=true] { background: var(--raised) !important; color: var(--ink) !important; box-shadow: var(--shadow-2); }
.app-nav .nav-tabs button[aria-pressed=true] .toolbar-symbol { color: var(--ui-accent); }
.seating-actions { gap: var(--s2); border: 0; padding: 0; align-items: center; }
.app-nav .seating-actions button { min-height: 32px; height: 32px; padding: 0 var(--s3); font-size: var(--t-body); }
.app-nav #random { background: var(--raised) !important; color: var(--ink) !important; border: 1px solid var(--line) !important; box-shadow: var(--shadow-1); }
.app-nav #random:hover:not(:disabled) { border-color: var(--ui-accent) !important; }
.app-nav #undo, .app-nav #redo { border-color: transparent; background: transparent; color: var(--ink); gap: 6px; padding: 0 var(--s2); }
.app-nav #undo:hover:not(:disabled), .app-nav #redo:hover:not(:disabled) { background: color-mix(in srgb, var(--ink) 6%, transparent); }
.app-nav #undo:disabled, .app-nav #redo:disabled { opacity: .38; }
.app-nav #toggleTools { min-height: 32px; height: 32px; padding: 0 var(--s3); border-color: transparent; background: transparent; color: var(--muted); font-size: var(--t-body); }
.app-nav #toggleTools::before { content: ""; width: 16px; height: 16px; background: currentColor; mask: url(assets/ui-panel.svg?v=90) center / contain no-repeat; -webkit-mask: url(assets/ui-panel.svg?v=90) center / contain no-repeat; }
.app-nav #toggleTools:hover:not(:disabled) { color: var(--ink); background: color-mix(in srgb, var(--ink) 6%, transparent); }

/* ---------- 4. Tools panel ---------- */
main { grid-template-columns: 296px minmax(0, 1fr); background: var(--bg); }
aside { background: var(--surface); padding: var(--s5) var(--s4) var(--s6); border-right: 1px solid var(--line); scrollbar-width: thin; }
#panelTitle { font-size: var(--t-panel); font-weight: 700; letter-spacing: -.3px !important; margin: 0 0 var(--s4); padding: 0; border: 0; }
#classControls > h2, #roomControls > h2, #studentControls > h2 { display: none; }
#studentControls > h2:last-of-type { display: block; }
#classControls > .hint.compact { margin: 0 0 var(--s3); }
aside h2 { margin: var(--s5) 0 var(--s2); font-size: var(--t-body); font-weight: 650; }
.desk-inspector h2, .icon-section h2, .colour-section h2 { margin-top: var(--s4); }
aside label { display: block; margin: var(--s3) 0 5px; color: var(--ink); }
aside label.check-label { display: flex; align-items: flex-start; gap: 9px; margin: var(--s3) 0; font-weight: 500; font-size: var(--t-body); line-height: 1.4; }
aside .check-label input { width: 16px; height: 16px; margin-top: 1px; flex: none; }

/* Disclosure groups: hairline-separated, no boxes in boxes. */
#roomControls > details, #manualEntry, .compass-import, .print-options, .backup-menu, .saved-rooms, #photoImport, #studentControls > details {
  border: 0; border-top: 1px solid var(--line); padding: var(--s3) 0; background: none; margin: 0;
}
#roomControls > details > details { border: 0; padding: var(--s2) 0 0; }
details[open] > summary { margin-bottom: var(--s2); }
details > .hint:first-of-type, details > p:first-of-type { margin-top: var(--s1); }
details button.wide, details .row { margin-top: var(--s2); }
.compass-import > p { color: var(--muted); font-size: var(--t-cap); margin: 0 0 var(--s2); }
#photoFitNote, .theme-decision {
  background: var(--warn-bg); border: 1px solid var(--warn-line); border-radius: var(--r-md); color: var(--warn-ink); padding: var(--s3); font-size: var(--t-cap); line-height: 1.5; margin: var(--s3) 0;
}
.theme-decision { background: color-mix(in srgb, var(--ui-accent) 7%, var(--raised)); border-color: var(--line); color: var(--ink); }
.theme-decision p { color: var(--ink); margin: 0 0 var(--s2); }
.theme-decision button { margin: 2px 4px 2px 0; min-height: 32px; font-size: var(--t-cap); }

.desk-inspector { border-top: 1px solid var(--line); margin-top: var(--s3); padding-top: var(--s1); }
#deskOverview { border-style: dashed; background: transparent; color: var(--muted); }
#deskOverview:hover:not(:disabled) { color: var(--ink); }
#selectionHint { font-size: var(--t-cap); padding: var(--s2) 0 var(--s3); background: none; }
#selectedDeskTools { padding: var(--s2) 0 0; border: 0; }
#deskLabel { font-size: var(--t-title) !important; font-weight: 650 !important; color: var(--ink); margin: 0 0 var(--s3); }
#selectedDeskTools .row button { font-size: var(--t-body); padding: 0 var(--s2); }
#selectedDeskTools .row > div { flex: 1; min-width: 0; }
#selectedDeskTools > .hint { margin: var(--s2) 0; }
#groupCount { font-weight: 600; color: var(--ink); }
#multiMode[aria-pressed=true] { background: color-mix(in srgb, var(--ui-accent) 12%, var(--raised)) !important; color: var(--ink) !important; border-color: var(--ui-accent); }

/* Class cards, theme cards, icon tiles: one selected state everywhere. */
.saved-room-card { display: flex; align-items: center; text-align: left; gap: var(--s3); width: 100%; min-height: 60px; padding: var(--s3); margin-top: var(--s2); border: 1px solid var(--line) !important; border-radius: var(--r-md); background: var(--raised); box-shadow: none; }
.saved-room-card .class-icon-tile { --icon-tint: var(--class-tint); width: 36px; height: 36px; }
.saved-room-card > span:not(.class-icon-tile) { flex: 1; min-width: 0; }
.saved-room-card strong { display: block; font-size: var(--t-body); font-weight: 600; overflow-wrap: anywhere; }
.saved-room-card small { display: block; color: var(--muted); font-size: var(--t-cap); line-height: 1.4; }
.saved-room-card[aria-pressed=true], .theme-choice[aria-pressed=true], .icon-choice[aria-pressed=true] {
  border-color: var(--ui-accent) !important; background: color-mix(in srgb, var(--ui-accent) 7%, var(--raised)); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ui-accent) 14%, transparent);
}
.theme-picker { display: grid; grid-template-columns: 1fr; gap: var(--s2); }
.theme-choice { position: relative; display: flex; flex-direction: row; align-items: center; justify-content: flex-start; text-align: left; gap: var(--s3); min-height: 72px; padding: var(--s2); padding-right: 40px; border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden; background: var(--raised); box-shadow: none; }
.theme-preview { width: 64px !important; height: 54px !important; border-radius: var(--r-sm); object-fit: cover; flex: none; }
.theme-copy { flex: 1; padding: 0; min-width: 0; }
.theme-copy strong { display: block; font-size: var(--t-body); font-weight: 600; }
.theme-copy small { display: block; font-size: var(--t-cap); color: var(--muted); line-height: 1.4; }
.theme-check, .appearance-panel .theme-check { display: none; position: absolute; right: 12px; top: 50%; transform: translateY(-50%); width: 20px; height: 20px; line-height: 0; font-size: 0; border-radius: 50%; background: var(--ui-accent); box-shadow: none; }
.theme-choice[aria-pressed=true] .theme-check, .theme-choice[aria-pressed=true] .appearance-panel .theme-check { display: block; }
.appearance-panel .theme-choice[aria-pressed=true] .theme-check { display: block; }
.theme-check::after { content: ""; position: absolute; inset: 4px; background: var(--ui-accent-ink); mask: url(assets/ui-check.svg?v=90) center / contain no-repeat; -webkit-mask: url(assets/ui-check.svg?v=90) center / contain no-repeat; }
.appearance-content > p { margin: 0 0 var(--s3); color: var(--muted); font-size: var(--t-cap); }
.appearance-footer { display: flex; flex-direction: column; align-items: flex-start; gap: var(--s2); border: 0; padding: var(--s3) 0; font-size: var(--t-cap); color: var(--muted); }
.appearance-footer button { min-height: 32px; font-size: var(--t-cap); background: transparent; white-space: nowrap; }
.icon-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s2); }
.icon-choice { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 7px; min-height: 78px; padding: var(--s2) 4px; border: 1px solid var(--line); border-radius: var(--r-md); background: var(--raised); color: var(--icon-tint, var(--ui-accent)); box-shadow: none; }
.icon-choice > span:last-child { font-size: var(--t-cap); line-height: 1.25; color: var(--muted); max-width: 100%; text-align: center; overflow-wrap: anywhere; }
.icon-choice[aria-pressed=true] > span:last-child { color: var(--ink); font-weight: 650; }
.icon-choice > span[aria-hidden] { font-size: 18px; color: var(--muted); }

.colour-row { border: 0; background: none; padding: 0; margin: var(--s4) 0 var(--s5); }
.colour-row > label { margin-top: 0; }
.colour-inputs { display: flex; gap: var(--s2); align-items: center; }
.colour-inputs input[type=color] { width: 48px; height: var(--ctl); flex: none; border-radius: var(--r-sm); }
.colour-inputs input[type=text] { flex: 1; min-width: 0; font-size: var(--t-body); font-variant-numeric: tabular-nums; text-transform: lowercase; }
.colour-swatches { display: flex; flex-wrap: wrap; gap: 6px; margin-top: var(--s2); }
.colour-swatches button { width: 26px; height: 26px; min-height: 26px; padding: 0; border-radius: 50%; border: 2px solid var(--surface); box-shadow: 0 0 0 1px var(--line-strong); }
.colour-swatches button:hover:not(:disabled) { box-shadow: 0 0 0 2px var(--ui-accent); border-color: var(--surface); }
#contrastNote { font-size: var(--t-cap); color: var(--muted); }

/* Lists: roster, unseated bank, photo review. */
.roster { margin-top: var(--s2); max-height: 280px; overflow: auto; }
.student { display: grid; grid-template-columns: minmax(0, 1fr) 92px; align-items: center; gap: var(--s2); padding: 7px 0; border-bottom: 1px solid var(--line); }
.student-identity { display: flex; align-items: center; gap: var(--s2); min-width: 0; }
.student-identity span { font-size: var(--t-body); color: var(--ink); overflow-wrap: anywhere; }
.student select { min-height: 30px; font-size: var(--t-cap); padding-left: var(--s2); }
.student-photo { border-radius: var(--r-xs); }
.bank { display: flex; flex-wrap: wrap; gap: 6px; border: 0; padding: 0; min-height: 0; background: transparent; }
.bank button { min-height: 32px; padding: 0 10px; border-radius: var(--r-pill); font-size: var(--t-cap); background: var(--raised); border-color: var(--line); cursor: grab; }
.bank button.selected { border-color: var(--ui-accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ui-accent) 15%, transparent); }
#studentBank h2 { font-size: var(--t-body); }
#roster:empty::before, #bank:empty::before { display: block; padding: var(--s3); border: 1px dashed var(--line-strong); border-radius: var(--r-md); color: var(--muted); font-size: var(--t-cap); line-height: 1.5; text-align: center; }
#roster:empty::before { content: "No students yet. Paste names, import a Compass list or upload a photo list to begin."; }
#bank:empty::before { content: "Everyone has a seat."; flex: 1; }
.photo-review-row { padding: var(--s3) 0; border-bottom: 1px solid var(--line); }
.photo-review-row input:not([type=checkbox]), .photo-review-row select { border-radius: var(--r-sm); }
#photoFeedback:not(:empty), #compassFeedback:not(:empty), #footerSaveStatus { margin-top: var(--s2); }

/* ---------- 5. Canvas frame ---------- */
.workspace { padding: var(--s3); background: var(--bg); }
.room { border: 1px solid var(--line); border-radius: var(--r-lg); box-shadow: var(--shadow-1); overflow: hidden; background: var(--surface); }
.room:before, .room:after, #canvasWrap:before, #canvasWrap:after { display: none !important; }
.room-heading-bar { display: flex; align-items: center; justify-content: space-between; gap: var(--s3); min-height: 36px; height: 36px; padding: 0 var(--s3) 0 var(--s4); border-bottom: 1px solid var(--line); background: var(--surface); }
.room-heading-bar .board { font-size: var(--t-cap); font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); background: none; border: 0; padding: 0; width: auto; margin: 0; }
#crowdedOverview { display: inline-flex; align-items: center; gap: 6px; min-height: 26px; height: 26px; padding: 0 10px; border-radius: var(--r-pill); font-size: var(--t-cap); font-weight: 600; background: var(--warn-bg); color: var(--warn-ink); border: 1px solid var(--warn-line); }
#crowdedOverview:hover:not(:disabled) { background: color-mix(in srgb, var(--warn-line) 35%, var(--warn-bg)); border-color: var(--warn-line); }
#crowdedOverview::before { content: ""; width: 14px; height: 14px; background: currentColor; mask: url(assets/ui-warn.svg?v=90) center / contain no-repeat; -webkit-mask: url(assets/ui-warn.svg?v=90) center / contain no-repeat; }
#crowdedOverview[hidden] { display: none !important; }

#canvasWrap, .grid, body[data-mode=dark] #canvasWrap, body[data-mode=dark] .grid { background-color: color-mix(in srgb, var(--room) 55%, var(--surface)); background-image: none; }
.arranging .grid { background-image: radial-gradient(color-mix(in srgb, var(--ink) 16%, transparent) .8px, transparent .9px); background-size: 24px 24px; }
#canvasWrap { scrollbar-width: thin; }

.canvas-controls { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: var(--s3); min-height: 48px; padding: 6px var(--s3); border-top: 1px solid var(--line); background: var(--surface); }
.canvas-controls .view-info { margin-right: auto; font-size: var(--t-cap); color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
.control-group { display: inline-flex; align-items: center; }
.canvas-controls button, .canvas-controls select { min-height: 32px; height: 32px; font-size: var(--t-cap); font-weight: 550; }
.zoom-group { background: var(--raised); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; box-shadow: var(--shadow-1); }
.zoom-group button { width: 34px; padding: 0; border: 0; border-radius: 0; background: transparent; color: var(--ink); }
.zoom-group select { width: 92px; border: 0; border-left: 1px solid var(--line); border-right: 1px solid var(--line); border-radius: 0; background-color: transparent; text-align: center; text-align-last: center; padding: 0 22px 0 8px; background-position: right 7px center; background-size: 12px; }
.segmented { gap: 2px; padding: 2px; border-radius: 10px; background: var(--sunken); }
.segmented button { padding: 0 11px; border: 0; border-radius: 8px; background: transparent; color: var(--muted); box-shadow: none; }
.segmented button:hover:not(:disabled) { color: var(--ink); background: color-mix(in srgb, var(--ink) 5%, transparent); border: 0; }
.segmented button[aria-pressed=true] { background: var(--raised); color: var(--ink); box-shadow: var(--shadow-2); }
.segmented button[aria-pressed=true] .ui-icon { color: var(--ui-accent); }

.foot { display: flex; align-items: center; justify-content: space-between; gap: var(--s3); margin: 6px var(--s1) 0; min-height: 20px; }
#status { font-size: var(--t-cap); color: var(--muted); margin: 0; min-height: 0; line-height: 1.4; }
#interactionHint, #count { font-size: var(--t-cap); color: var(--muted); white-space: nowrap; }
.empty-room { display: grid; justify-items: center; gap: var(--s2); max-width: 420px; padding: var(--s6); border: 1px dashed var(--line-strong); border-radius: var(--r-lg); background: var(--surface); color: var(--muted); font-size: var(--t-ui); line-height: 1.55; text-align: center; }
.empty-room::before { content: ""; width: 34px; height: 34px; background: var(--ui-accent); mask: url(assets/ui-desk-empty.svg?v=90) center / contain no-repeat; -webkit-mask: url(assets/ui-desk-empty.svg?v=90) center / contain no-repeat; opacity: .85; }
.room-watermark { font-weight: 700; letter-spacing: -1px; opacity: .045; }

/* ---------- 6. Desks, student cards and grips ---------- */
.desk, .desk.teacher { filter: none !important; }
.desk-surface, .desk.teacher .desk-surface {
  background: color-mix(in srgb, var(--desk-bottom) 48%, var(--surface)) !important;
  border: 1px solid color-mix(in srgb, var(--desk-rim) 45%, var(--surface)); border-radius: 12px; box-shadow: inset 0 1px 0 color-mix(in srgb, #fff 45%, transparent) !important;
}
body[data-mode=dark] .desk-surface, body[data-mode=dark] .desk.teacher .desk-surface { background: color-mix(in srgb, var(--desk-bottom) 26%, var(--surface)) !important; box-shadow: inset 0 1px 0 #ffffff0d !important; }
body[data-mode=dark] .desk.teacher .desk-surface { background: color-mix(in srgb, var(--desk-bottom) 18%, var(--surface)) !important; }
.desk-surface:after { display: none !important; }
.desk.teacher .desk-surface { background: color-mix(in srgb, var(--desk-bottom) 30%, var(--surface)) !important; }
.teacher-label { font-size: var(--t-ui); font-weight: 600; color: var(--muted); }
.desk.needs-space .desk-surface { border: 1.5px dashed var(--warn-line); }

/* Student cards: names and faces are the strongest thing in the room. */
.desk .student-card { border: 1px solid color-mix(in srgb, var(--ink) 10%, var(--seat-bg)); border-radius: var(--r-md); background: var(--seat-bg) !important; box-shadow: 0 1px 2px #1d1d1f12, 0 4px 12px #1d1d1f0a; opacity: 1; transition: box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease); }
body[data-mode=dark] .desk .student-card { box-shadow: 0 1px 2px #0006, 0 4px 12px #0004; }
.desk .student-card:not(.empty):hover { border-color: var(--line-strong); box-shadow: 0 2px 4px #1d1d1f1a, 0 8px 18px #1d1d1f12; }
.desk .student-card .card-name { font-size: 15px !important; line-height: 19px !important; font-weight: 600 !important; letter-spacing: -.15px; color: var(--seat-ink) !important; }
.card-portrait, .card-initials { border-radius: var(--r-sm); }
.card-initials { background: color-mix(in srgb, var(--ui-accent) 11%, var(--seat-bg)); color: var(--ui-accent); font: 650 19px var(--font); }
.desk .student-card.empty { border: 1px dashed var(--line-strong); background: color-mix(in srgb, var(--seat-bg) 60%, transparent) !important; box-shadow: none; }
.desk .student-card.empty .card-name { color: var(--muted) !important; font-weight: 500 !important; font-size: 13px !important; line-height: 17px !important; }
.desk .student-card.selected, .desk .student-card.over, .desk .student-card:focus-visible { outline: 2.5px solid var(--ui-accent); outline-offset: 2px; box-shadow: 0 0 0 6px color-mix(in srgb, var(--ui-accent) 16%, transparent); }
.desk .student-card.dragging { opacity: .6; }
/* Numbered markers on crowded desks: local, quiet, clearly tappable. */
.desk .seat-marker { border: 1.5px solid color-mix(in srgb, var(--warn-line) 80%, var(--ink)) !important; background: var(--raised) !important; box-shadow: var(--shadow-1); }
.desk .seat-marker strong { font-size: 14px; font-weight: 700; color: var(--ink) !important; }
.seat-connector { opacity: .7; }

/* Desk badges: quiet by default, accent when the desk is selected. */
.desk .desk-handle, .arranging .desk-handle, .room:not(.arranging) .desk-handle {
  display: inline-flex; align-items: center; justify-content: center; height: 22px; min-height: 22px; padding: 0 7px !important; border-radius: var(--r-xs);
  background: var(--raised); color: var(--muted) !important; border: 1px solid var(--line); box-shadow: none; font-size: var(--t-cap) !important; font-weight: 600; line-height: 1; letter-spacing: .01em !important;
}
.room:not(.arranging) .desk-handle:hover { color: var(--ink) !important; border-color: var(--line-strong); }
.desk.active .desk-handle { background: var(--ui-accent); color: var(--ui-accent-ink) !important; border-color: transparent; }
.desk.needs-space .desk-handle, .desk.needs-space.active .desk-handle { background: var(--warn-bg); color: var(--warn-ink) !important; border-color: var(--warn-line); }
.desk .desk-handle:focus-visible { outline: 2px solid var(--ui-accent); outline-offset: 2px; }

/* Selection: one clean frame on the desk's bounding box, any shape, any rotation. */
.desk-hit { border: 1.5px solid transparent; border-radius: 10px !important; background: transparent !important; transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease); }
.arranging .desk:not(.active) .desk-hit:hover { border-color: color-mix(in srgb, var(--ui-accent) 45%, transparent); }
.desk.active .desk-hit { border-color: var(--ui-accent); outline: 0 !important; box-shadow: 0 0 0 4px color-mix(in srgb, var(--ui-accent) 15%, transparent) !important; }
.desk.active .desk-surface { background: color-mix(in srgb, var(--ui-accent) 9%, color-mix(in srgb, var(--desk-bottom) 48%, var(--surface))) !important; border-color: color-mix(in srgb, var(--ui-accent) 55%, var(--line)); outline: 0 !important; }
.desk.dragging .desk-hit { cursor: grabbing; box-shadow: 0 0 0 4px color-mix(in srgb, var(--ui-accent) 20%, transparent), var(--shadow-2) !important; }
.desk-hit:focus-visible { outline: 3px solid var(--ui-accent) !important; outline-offset: 3px; }
.desk-marquee { border: 1.5px solid var(--ui-accent); background: color-mix(in srgb, var(--ui-accent) 12%, transparent); border-radius: 4px; }

/* Stacking: a selected desk (with its hit area and grips) always sits above neighbours, so an overlapping desk can never swallow a grip's pointer events. */
.desk.active { z-index: 20; }
.desk.active.dragging, .desk.active.resizing { z-index: 30 !important; }

/* Resize grips. The hit area is 36px on screen (44px on touch) at every zoom,
   the visible handle is accent-filled with a surface ring so it reads on any desk or palette. */
.arranging .desk .desk-resize {
  position: absolute; z-index: 12; width: var(--resize-size, 36px); height: var(--resize-size, 36px); min-width: 0; min-height: 0; padding: 0;
  border: 0 !important; border-radius: 0; background: transparent !important; box-shadow: none !important; opacity: 1; transform: translate(-50%, -50%); touch-action: none;
}
.arranging .desk .desk-resize::after {
  content: ""; position: absolute; inset: 29%; border: 2.5px solid var(--raised); border-radius: 50%; background: var(--ui-accent);
  box-shadow: 0 1px 3px #0000004d, 0 0 0 1px color-mix(in srgb, var(--ui-accent) 40%, transparent); transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.arranging .desk .resize-e { cursor: ew-resize; }
.arranging .desk .resize-s { cursor: ns-resize; }
.arranging .desk .resize-se { cursor: nwse-resize; }
.arranging .desk .resize-e::after { inset: 22% 36%; border-radius: 999px; }
.arranging .desk .resize-s::after { inset: 36% 22%; border-radius: 999px; }
.arranging .desk .desk-resize:hover::after, .arranging .desk .desk-resize:focus-visible::after, .arranging .desk.resizing .desk-resize::after { transform: scale(1.15); box-shadow: 0 2px 6px #00000059, 0 0 0 5px color-mix(in srgb, var(--ui-accent) 24%, transparent); }
.arranging .desk .desk-resize:focus-visible { outline: 0; }
.desk.resizing .desk-hit { border-style: dashed; }
.desk .desk-duplicate { z-index: 10; }

/* ---------- 7. Dialogs ---------- */
dialog { background: var(--surface); color: var(--ink); border: 1px solid var(--line); border-radius: var(--r-xl); box-shadow: var(--shadow-3); padding: var(--s6); max-width: min(960px, calc(100vw - 32px)); }
dialog::backdrop { background: var(--scrim); backdrop-filter: none; }
.dialog-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--s4); margin-bottom: var(--s3); }
.dialog-heading h2 { font-size: 20px; font-weight: 700; letter-spacing: -.3px !important; margin: 0; }
.dialog-heading p { margin: 2px 0 0; color: var(--muted); font-size: var(--t-body); }
.dialog-heading button { min-height: 32px; height: 32px; padding: 0 var(--s3); border-color: var(--line); background: var(--raised); color: var(--ink); }
#deskStudentsHint, dialog > p { color: var(--muted); font-size: var(--t-body); }
#deskStudentsList, #deskOverviewList { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: var(--s2); margin: var(--s3) 0; }
#deskOverviewList button { justify-content: flex-start; min-height: 42px; text-align: left; }
.focus-student { display: flex; align-items: center; justify-content: flex-start; text-align: left; gap: var(--s3); padding: var(--s3); border: 1px solid var(--line); border-radius: var(--r-md); background: var(--raised); }
.focus-student strong { display: block; font-size: var(--t-title); font-weight: 600; overflow-wrap: anywhere; }
.focus-student small { display: block; font-size: var(--t-cap); color: var(--muted); }
.focus-portrait { border-radius: var(--r-sm); background: color-mix(in srgb, var(--ui-accent) 11%, var(--raised)); color: var(--ui-accent); }
#makeRoom { margin-top: var(--s2); }
#printPreviewDialog { border-radius: var(--r-xl); }
.print-preview-settings label { font-size: var(--t-cap); }
.print-preview-settings input[type=color] { width: 100%; }
#previewPages { background: color-mix(in srgb, var(--ink) 7%, var(--bg)); border-radius: var(--r-md); padding: var(--s4); }
#previewPages > svg { border-radius: 4px; box-shadow: var(--shadow-2); }
#printScaleNote { border: 0; background: var(--raised); border-radius: 10px; color: var(--muted); font-size: var(--t-cap); }
#printDraftStatus { color: var(--muted); font-size: var(--t-cap); }
.print-preview-actions { display: flex; gap: var(--s2); }
.print-preview-actions button { flex: 1; }
/* Print pages stay dark-on-white even inside a dark dialog. */
/* A printed key page is always dark ink on white: preview, print sheet, light or dark mode. */
.print-roster-page, #previewPages .print-roster-page, #printSheet .print-roster-page {
  color: #23262d; background: #fff; --ink: #23262d; --muted: #626772; --control: #fff; --raised: #fff; --surface: #fff; --seat-bg: #fff; --seat-ink: #23262d; --line: #dedfe2; --line-strong: #c4c6cc; --ui-accent: #3867a8;
}
.print-roster-page h2, .print-roster-page p { color: #23262d; }
.print-roster-page .focus-student { background: #fff; border-color: #dedfe2; }
.print-roster-page .focus-portrait { background: #e8edf5; color: #3867a8; }
.print-roster-page { font-family: var(--font); }

/* ---------- 8. Responsive ---------- */
@media (max-width: 1150px) {
  header { gap: var(--s3); padding: 0 var(--s4); }
  .app-nav { gap: var(--s3); padding: 0 var(--s4); }
  .app-nav .nav-tabs button { padding: 0 var(--s2); }
  .app-nav .seating-actions button { padding: 0 var(--s2); }
  main { grid-template-columns: 268px minmax(0, 1fr); }
  .workspace { padding: var(--s2); }
}
@media (max-width: 950px) {
  .header-actions button, .header-actions #print, .header-actions #darkMode { font-size: 0; gap: 0; padding: 0; width: 34px; }
  .header-actions button::before { margin: 0; }
  .app-nav { flex-wrap: wrap; height: auto; padding-top: 6px; padding-bottom: 6px; }
  .seating-actions { order: 3; flex-basis: 100%; margin: 0; }
  .seating-actions button { flex: 1; }
  .app-nav #toggleTools { margin-left: auto; }
  main { grid-template-columns: 244px minmax(0, 1fr); }
  aside { padding: var(--s4) var(--s3); }
  .segmented button { padding: 0 9px; }
  .canvas-controls { gap: var(--s2); }
  .print-preview-layout { grid-template-columns: 220px minmax(0, 1fr); }
}
@media (max-width: 800px) {
  .segmented button { font-size: 0; gap: 0; padding: 0; width: 34px; }
}
@media (max-width: 700px) {
  header { height: 52px; min-height: 52px; padding: 0 var(--s3); gap: var(--s2); }
  .brand > div { display: none; }
  .header-room { min-width: 90px; }
  .app-nav { padding-left: var(--s3); padding-right: var(--s3); }
  .nav-tabs { flex: 1; }
  .app-nav .nav-tabs button { flex: 1; padding: 0 6px; }
  .toolbar-symbol { display: none; }
  #panelTitle { font-size: 18px; }
  .print-preview-layout { grid-template-columns: 1fr; }
  .print-preview-settings .row { max-width: 320px; }
  .tag, header .tag { padding: 0 6px; }
  .seating-actions { flex-wrap: wrap; }
  .app-nav #undo, .app-nav #redo { font-size: 0; gap: 0; flex: 0 0 40px; width: 40px; padding: 0; }
  .tag[data-state=saved] { font-size: 0; gap: 0; }
}
@media (max-width: 600px) {
  main { display: flex; flex-direction: column; }
  aside { width: 100%; height: auto; max-height: 36dvh; padding: var(--s4); border-right: 0; border-bottom: 1px solid var(--line); }
  .workspace { padding: var(--s2); }
  .room { border-radius: var(--r-md); }
  .canvas-controls .view-info { flex-basis: 100%; margin: 0; }
  .icon-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .header-room #headingIconTile { display: none; }
  dialog { padding: var(--s4); border-radius: var(--r-lg); }
}
@media (pointer: coarse) {
  :root { --ctl: 44px; }
  button, input, select { min-height: 44px; }
  .app-nav .nav-tabs button, .app-nav .seating-actions button, .app-nav #toggleTools, .header-actions button { min-height: 40px; height: 40px; }
  .canvas-controls button, .canvas-controls select { min-height: 40px; height: 40px; }
  .zoom-group button { width: 42px; }
  .canvas-controls { min-height: 56px; }
  .desk .desk-handle, .arranging .desk-handle, .room:not(.arranging) .desk-handle { height: 28px; min-height: 28px; padding: 0 10px !important; }
}

/* ---------- 9. Accessibility ---------- */
button:focus-visible, summary:focus-visible, #canvasWrap:focus-visible { outline: 2px solid var(--ui-accent); outline-offset: 2px; }
input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 2px solid var(--ui-accent); outline-offset: 0; border-color: var(--ui-accent); }
.segmented button:focus-visible, .zoom-group button:focus-visible, .nav-tabs button:focus-visible { outline-offset: -2px; }
@media (prefers-reduced-motion: reduce) {
  *, *:before, *:after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}
@media (prefers-contrast: more) {
  body[data-room-theme] { --line: #8a8a92; --line-strong: #5c5c64; --muted: #3c3c44; }
  body[data-mode=dark] { --line: #84848c; --line-strong: #b0b0b8; --muted: #d4d4da; }
}
@media (forced-colors: active) {
  .desk.active .desk-hit, .arranging .desk .desk-resize::after, .segmented button[aria-pressed=true] { outline: 2px solid Highlight; }
}

/* ---------- 10. Print ---------- */
@media print {
  .room-heading-bar, .canvas-controls, .foot { display: none !important; }
  .print-roster-page { color: #23262d; }
  .print-roster-page .focus-student { background: #fff; color: #23262d; border-color: #ddd; }
  .print-roster-page .focus-student small { color: #626772; }
}

/* Student list actions: visible labels, compact layout, touch-sized targets. */
.roster-heading { display:flex; align-items:center; justify-content:space-between; gap:8px; margin-top:20px; }
.roster-heading h2 { margin:0; }
.student { grid-template-columns:minmax(0,1fr) 90px; }
.student .student-identity { grid-column:1 / -1; }
.student .remove-student { justify-self:end; }
.remove-student { color:var(--ink); background:transparent; border:1px solid var(--line); min-height:44px; padding:8px 10px; font-size:12px; }
.remove-student:hover:not(:disabled) { color:#b63838; background:color-mix(in srgb,#c74646 9%,var(--raised)); }
body[data-mode=dark] .remove-student:hover:not(:disabled) { color:#ffaaaa; }