/* Seating Plan page (scripts/build-corpus.js buildSeatingPage, content/seating-page.js).
   A toolbar over a two-column workspace: the room plan (an SVG drawn in
   centimetres) on the left, the current step's tools in a rail on the right;
   on phones the rail drops under the plan.
   Night look only, like every teacher tool: the colours are the --cp-* ones
   corpus-night.css sets on body.corpus-night (copied from
   teacher/class-progress.css), with the same values as fallbacks. Print is
   separate and always black on white: the PDF, and .plan.paper for its preview.
   Every rule is under .sp so nothing leaks into the page around it. */

.sp {
    --floor: var(--cp-bg, #2B1D4B);
    --panel: var(--cp-panel, #3E2F6D);
    --card: var(--cp-card, #33255A);
    --orange: var(--cp-accent, #EE7F3B);
    --orange-soft: rgba(238,127,59,.16);
    --orange-line: rgba(238,127,59,.6);
    --page: #241a3c;
    --inset: rgba(16,8,34,.45);
    --line: rgba(255,255,255,.12);
    --line-2: rgba(255,255,255,.22);
    --glass: rgba(255,255,255,.08);
    --glass-hover: rgba(255,255,255,.18);
    --ink: #fff;
    --ink-2: #E4D9FF;
    --ink-3: #B3A2D8;
    --label: #9B8AC4;
    --ink-4: #8E7DB8;
    --link: #C4B5FD;
    --purple: #7C2BF5;
    --purple-hover: #8F45FF;
    --gold: #FBBF24;
    --green: #A9E77A;
    --seat: #5B47A6;
    --seat-empty: rgba(16,8,34,.42);
    --grid: rgba(255,255,255,.05);
    --font-display: 'Baloo 2', 'Fredoka', ui-rounded, system-ui, sans-serif;
    --font-body: 'Nunito Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
    display: grid;
    gap: 14px;
    margin: 18px 0 8px;
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.45;
}
.sp *, .sp *::before, .sp *::after { box-sizing: border-box; }
.sp [hidden] { display: none !important; }

/* ── Toolbar ─────────────────────────────────────────────────────────── */
.sp .top { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 12px 22px; }
.sp .pickers { display: flex; flex-wrap: wrap; gap: 10px; margin-right: auto; }
.sp .field { display: grid; gap: 4px; min-width: 0; }
.sp .lbl { font-size: .72rem; letter-spacing: 1.5px; font-weight: 900; color: var(--label); text-transform: uppercase; margin: 0; }
.sp .top-actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.sp select, .sp input[type=text], .sp input[type=number], .sp textarea {
    background: var(--inset); color: var(--ink);
    border: 1px solid var(--line); border-radius: 13px;
    padding: 8px 12px; font: 700 .95rem/1.3 var(--font-body);
    min-width: 0; max-width: 100%;
}
.sp select { padding-right: 30px; min-width: 150px; }
.sp select option { background: var(--card); color: var(--ink); }
.sp textarea { width: 100%; resize: vertical; line-height: 1.5; }
.sp input[type=number] { width: 5.5em; font-variant-numeric: tabular-nums; }
.sp select:focus, .sp input:focus, .sp textarea:focus { outline: none; border-color: var(--orange-line); box-shadow: 0 0 0 3px var(--orange-soft); }

.sp .btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 7px;
    border: 1px solid var(--line); background: var(--glass); color: var(--ink);
    border-radius: 14px; padding: 8px 14px;
    font: 800 1rem/1.2 var(--font-display); cursor: pointer;
    transition: background .15s, transform .15s;
}
.sp .btn:hover { background: var(--glass-hover); }
.sp .btn.primary { background: var(--purple); border-color: var(--purple); box-shadow: 0 4px 0 rgba(0,0,0,.2); }
.sp .btn.primary:hover { background: var(--purple-hover); transform: translateY(-1px); }
.sp .btn.danger { color: #FFC9A8; border-color: var(--orange-line); }
.sp .btn.small { padding: 6px 11px; font-size: .92rem; border-radius: 12px; }
.sp .btn:disabled { opacity: .4; cursor: default; transform: none; }
.sp .btn:focus-visible, .sp .seg button:focus-visible, .sp .chip:focus-visible, .sp .layout:focus-visible,
.sp .add:focus-visible, .sp summary:focus-visible, .sp .linkish:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }
.sp .btn-row { display: flex; flex-wrap: wrap; gap: 8px; }
.sp .linkish { background: none; border: 0; padding: 0; color: var(--link); font: 800 .9rem var(--font-body); text-decoration: underline; text-underline-offset: 3px; cursor: pointer; }

/* Segmented controls: the step, and the view */
.sp .seg { display: inline-flex; flex-wrap: wrap; background: var(--inset); border: 1px solid var(--line); border-radius: 14px; padding: 3px; gap: 3px; }
.sp .seg button { border: 0; background: transparent; color: var(--ink-3); font: 800 .98rem/1.2 var(--font-display); padding: 7px 14px; border-radius: 11px; cursor: pointer; }
.sp .seg button:hover { color: var(--ink); }
.sp .seg button[aria-pressed="true"] { background: var(--panel); color: var(--ink); box-shadow: inset 0 0 0 1px var(--line-2); }
.sp .seg .step-n { color: var(--gold); margin-right: 4px; }

/* ── Workspace ───────────────────────────────────────────────────────── */
.sp .work { display: grid; grid-template-columns: minmax(0, 1fr) 350px; gap: 14px; align-items: start; }
@media (max-width: 1000px) { .sp .work { grid-template-columns: minmax(0, 1fr); } }

.sp .stage-wrap { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 12px; display: grid; gap: 10px; min-width: 0; box-shadow: 0 20px 44px rgba(11,16,32,.35); }
.sp .stage-bar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.sp .stage-bar .spacer { margin-left: auto; }
.sp .view-cap { margin: 0 2px; font-size: .88rem; color: var(--ink-3); font-weight: 700; }
.sp .view-cap b { color: var(--ink-2); }
.sp .stage { background: var(--floor); border-radius: 14px; overflow: hidden; display: flex; justify-content: center; min-width: 0; }
.sp #room { display: block; width: 100%; height: auto; max-height: 74vh; touch-action: none; user-select: none; -webkit-user-select: none; }
.sp .stage-foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 16px; font-size: .86rem; color: var(--ink-3); font-weight: 700; font-variant-numeric: tabular-nums; padding: 0 2px; }
.sp .stage-foot .warn { color: var(--orange); }
.sp .stage-foot .ok { color: var(--green); }
.sp .stage-wrap:fullscreen { border-radius: 0; padding: 18px; background: var(--page); align-content: start; }
.sp .stage-wrap:fullscreen #room { max-height: calc(100vh - 150px); }

.sp .side { display: grid; gap: 12px; min-width: 0; }
.sp .panel { display: grid; gap: 12px; min-width: 0; }
.sp .card { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 15px 16px 17px; display: grid; gap: 10px; min-width: 0; }
.sp .card h2 { font-family: var(--font-display); font-size: 1.22rem; font-weight: 800; margin: 0; line-height: 1.15; display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; color: var(--ink); }
.sp .card h2 .count { font-family: var(--font-body); font-size: .85rem; color: var(--label); font-weight: 800; }
.sp .hint { margin: 0; color: var(--ink-3); font-size: .88rem; font-weight: 600; }
.sp .msg { margin: 0; color: var(--ink-2); font-size: .9rem; font-weight: 700; min-height: 0; }
.sp .msg:empty { display: none; }
.sp .msg.warn { color: #FFC9A8; }
.sp .example-note { margin: 0; padding: 9px 12px; border-radius: 13px; background: var(--orange-soft); border: 1px solid var(--orange-line); color: var(--ink-2); font-size: .88rem; font-weight: 700; }
.sp .privacy { margin: 2px 4px 0; color: var(--label); font-size: .82rem; font-weight: 700; }
.sp .row { display: flex; flex-wrap: wrap; gap: 8px 10px; align-items: center; }
.sp .row label { font-weight: 700; color: var(--ink-2); font-size: .92rem; }

/* Layout tiles: each preview is drawn by the same code that places the desks */
.sp .layouts { display: grid; grid-template-columns: repeat(auto-fill, minmax(88px, 1fr)); gap: 8px; }
.sp .layout { display: grid; gap: 4px; justify-items: center; padding: 8px 6px 7px; border-radius: 14px; border: 1px solid var(--line); background: var(--inset); color: var(--ink-2); font: 800 .82rem/1.15 var(--font-body); cursor: pointer; text-align: center; }
.sp .layout:hover { border-color: var(--line-2); }
.sp .layout[aria-pressed="true"] { border-color: var(--gold); box-shadow: inset 0 0 0 1px var(--gold); color: var(--ink); }
.sp .mini { width: 100%; max-width: 84px; height: auto; display: block; }
.sp .mini .m-floor { fill: var(--floor); stroke: var(--label); stroke-width: 14; }
.sp .mini .m-board { fill: var(--ink); }
.sp .mini .m-desk { fill: var(--seat); }

.sp .adds { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.sp .add { display: flex; align-items: center; gap: 8px; padding: 8px 10px; border-radius: 13px; border: 1px solid var(--line); background: var(--glass); color: var(--ink); font: 800 .9rem/1.15 var(--font-body); cursor: pointer; text-align: left; }
.sp .add:hover { background: var(--glass-hover); }
.sp .add svg { flex: none; width: 26px; height: 20px; }
.sp .add .i-desk { fill: var(--seat); stroke: var(--line-2); }
.sp .add .i-thing { fill: none; stroke: var(--ink-3); stroke-width: 1.6; stroke-dasharray: 3 2; }
.sp .add .i-teacher { fill: var(--orange-soft); stroke: var(--orange); stroke-width: 1.6; }
.sp .add .i-door { fill: var(--gold); }
.sp .add .i-window { fill: var(--link); }

.sp .keys { margin: 0; font-size: .8rem; color: var(--label); font-weight: 700; line-height: 1.6; }
.sp kbd { font: 800 .76rem var(--font-body); color: var(--ink-2); background: var(--inset); border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 6px; padding: 0 5px; }

/* Name chips: the not-seated tray, keep-apart pairs */
.sp .chips { display: flex; flex-wrap: wrap; gap: 6px; min-height: 40px; padding: 6px; border-radius: 14px; background: var(--inset); border: 1px dashed var(--line-2); align-content: flex-start; }
.sp .chips.drop { border-color: var(--gold); background: rgba(251,191,36,.12); }
.sp .chips .empty { color: var(--label); font-size: .86rem; font-weight: 700; padding: 4px 6px; }
.sp .chip { border: 1px solid rgba(255,255,255,.28); background: var(--seat); color: var(--ink); border-radius: 999px; padding: 5px 12px; font: 800 .9rem/1.2 var(--font-body); cursor: grab; touch-action: none; }
.sp .chip[aria-pressed="true"] { box-shadow: 0 0 0 3px var(--gold); }
.sp .tag { display: inline-flex; align-items: center; gap: 4px; border-radius: 999px; padding: 3px 4px 3px 11px; background: var(--glass); border: 1px solid var(--line); font-weight: 800; font-size: .88rem; }
.sp .tag button { border: 0; background: transparent; color: var(--ink-3); font: 900 1rem/1 var(--font-body); cursor: pointer; padding: 2px 6px; border-radius: 999px; }
.sp .tag button:hover { color: var(--ink); background: var(--glass-hover); }
.sp .tags { display: flex; flex-wrap: wrap; gap: 6px; }

.sp .toggle { display: flex; gap: 10px; align-items: flex-start; font-weight: 700; color: var(--ink-2); font-size: .93rem; cursor: pointer; }
.sp .toggle input { width: 18px; height: 18px; margin: 2px 0 0; accent-color: var(--purple); flex: none; }
.sp .toggle small { display: block; color: var(--label); font-weight: 600; font-size: .8rem; }

.sp details { border-top: 1px solid var(--line); padding-top: 10px; }
.sp summary { cursor: pointer; font-weight: 800; color: var(--ink-2); list-style: none; display: flex; align-items: center; gap: 8px; }
.sp summary::-webkit-details-marker { display: none; }
.sp summary::before { content: ""; width: 0; height: 0; border-left: 6px solid var(--label); border-top: 5px solid transparent; border-bottom: 5px solid transparent; transition: transform .15s; }
.sp details[open] summary::before { transform: rotate(90deg); }
.sp details > .inner { display: grid; gap: 9px; margin-top: 10px; }
.sp .here-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 4px 10px; max-height: 260px; overflow: auto; padding-right: 4px; }
.sp .here-list label { display: flex; gap: 8px; align-items: center; font-weight: 700; font-size: .9rem; color: var(--ink-2); cursor: pointer; min-width: 0; }
.sp .here-list label span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sp .here-list input { accent-color: var(--purple); width: 16px; height: 16px; flex: none; }

.sp .confirm { display: grid; gap: 8px; padding: 10px 12px; border-radius: 13px; background: var(--orange-soft); border: 1px solid var(--orange-line); }
.sp .confirm p { margin: 0; font-weight: 700; font-size: .9rem; color: var(--ink-2); }

/* ── The plan (screen) ───────────────────────────────────────────────── */
.sp .plan .floor { fill: var(--floor); }
.sp .plan .gridline { stroke: var(--grid); stroke-width: 1; }
.sp .plan .wall { fill: none; stroke: var(--label); stroke-width: 5; }
.sp .plan .board { fill: var(--ink); }
.sp .plan .board-label { fill: var(--ink-2); font-family: var(--font-display); font-weight: 800; letter-spacing: 5px; text-anchor: middle; dominant-baseline: central; }
.sp .plan .desk { fill: var(--panel); stroke: var(--line-2); stroke-width: 1.5; }
.sp .plan .seat rect { fill: var(--seat-empty); stroke: rgba(255,255,255,.14); stroke-width: 1.2; }
.sp .plan .seat.filled rect { fill: var(--seat); stroke: rgba(255,255,255,.32); }
.sp .plan .seat text { fill: var(--ink); font-family: var(--font-body); font-weight: 800; text-anchor: middle; dominant-baseline: central; }
.sp .plan .seat text.num { fill: var(--ink-4); font-weight: 700; }
.sp .plan .seat text.corner { fill: var(--ink-4); font-weight: 700; text-anchor: start; dominant-baseline: hanging; }
.sp .plan .seat.away rect { fill: transparent; stroke: var(--label); stroke-dasharray: 6 4; stroke-width: 1.6; }
.sp .plan .seat.away text { fill: var(--label); }
.sp .plan .seat.sel rect { stroke: var(--gold); stroke-width: 4; }
.sp .plan .seat.drop rect { stroke: var(--gold); stroke-width: 4; fill: rgba(251,191,36,.22); }
.sp .plan .thing { fill: rgba(255,255,255,.05); stroke: var(--ink-4); stroke-width: 1.6; stroke-dasharray: 7 5; }
.sp .plan .thing.teacher { fill: var(--orange-soft); stroke: var(--orange); stroke-dasharray: none; }
.sp .plan .thing.door { fill: var(--gold); stroke: none; }
.sp .plan .thing.window { fill: var(--link); stroke: none; }
.sp .plan .thing-label { fill: var(--ink-3); font-family: var(--font-body); font-weight: 800; text-anchor: middle; dominant-baseline: central; paint-order: stroke; stroke: var(--floor); stroke-width: 4px; }
.sp .plan .tableno circle { fill: var(--page); stroke: var(--gold); stroke-width: 2; }
.sp .plan .tableno text { fill: var(--gold); font-family: var(--font-display); font-weight: 800; text-anchor: middle; dominant-baseline: central; }
.sp .plan .item.sel .desk, .sp .plan .item.sel .thing { stroke: var(--orange); stroke-width: 4; stroke-dasharray: none; }
.sp .mode-room #room .item { cursor: grab; }
.sp .mode-room #room .item.sel { cursor: move; }
.sp .mode-seat #room .seat.filled { cursor: grab; }

/* ── The plan (paper): print preview, always black on white ──────────── */
.sp .plan.paper .floor { fill: #fff; }
.sp .plan.paper .wall { stroke: #000; stroke-width: 3; }
.sp .plan.paper .board { fill: #000; }
.sp .plan.paper .board-label { fill: #000; }
.sp .plan.paper .desk { fill: #fff; stroke: #000; stroke-width: 1; }
.sp .plan.paper .seat rect, .sp .plan.paper .seat.filled rect, .sp .plan.paper .seat.away rect { fill: #fff; stroke: #000; stroke-width: 1.6; stroke-dasharray: none; }
.sp .plan.paper .seat text, .sp .plan.paper .seat.away text { fill: #000; }
.sp .plan.paper .seat text.num, .sp .plan.paper .seat text.corner { fill: #777; }
.sp .plan.paper .thing, .sp .plan.paper .thing.teacher { fill: #fff; stroke: #000; stroke-width: 1.2; stroke-dasharray: 6 4; }
.sp .plan.paper .thing.door, .sp .plan.paper .thing.window { fill: #fff; stroke: #000; stroke-width: 1.4; stroke-dasharray: none; }
.sp .plan.paper .thing-label { fill: #000; stroke: #fff; }
.sp .plan.paper .tableno circle { fill: #fff; stroke: #000; stroke-width: 1.4; }
.sp .plan.paper .tableno text { fill: #000; }

/* ── Print dialog ────────────────────────────────────────────────────── */
.sp .modal-back { position: fixed; inset: 0; z-index: 2000; background: rgba(10,6,22,.72); display: grid; place-items: center;
    padding: max(16px, env(safe-area-inset-top, 0px)) max(16px, env(safe-area-inset-right, 0px)) max(16px, env(safe-area-inset-bottom, 0px)) max(16px, env(safe-area-inset-left, 0px)); overflow: auto; }
.sp .modal { width: min(980px, 100%); background: var(--panel); border: 1px solid var(--line); border-radius: 20px; box-shadow: 0 20px 44px rgba(11,16,32,.45); padding: 18px; display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 18px; }
@media (max-width: 820px) { .sp .modal { grid-template-columns: minmax(0, 1fr); } }
.sp .modal h2 { font-family: var(--font-display); font-size: 1.5rem; font-weight: 800; margin: 0; line-height: 1.1; color: var(--ink); }
.sp .modal .opts { display: grid; gap: 14px; align-content: start; }
.sp fieldset { border: 0; margin: 0; padding: 0; display: grid; gap: 6px; min-width: 0; }
.sp legend { padding: 0; margin-bottom: 4px; }
.sp .radio { display: flex; gap: 9px; align-items: flex-start; padding: 7px 10px; border-radius: 12px; border: 1px solid var(--line); background: var(--inset); cursor: pointer; font-weight: 800; font-size: .93rem; }
.sp .radio:has(input:checked) { border-color: var(--gold); }
.sp .radio input { accent-color: var(--purple); margin: 3px 0 0; flex: none; }
.sp .radio small { display: block; font-weight: 600; color: var(--ink-3); font-size: .8rem; }
.sp .paper-wrap { background: #fff; border-radius: 12px; padding: 12px; display: grid; gap: 12px; align-content: start; min-width: 0; }
.sp .paper-sheet { display: grid; gap: 4px; min-width: 0; }
.sp .paper-sheet p { margin: 0; color: #000; font: 700 .8rem var(--font-body); }
.sp .paper-sheet p b { font: 800 1rem var(--font-body); }
.sp .paper-sheet svg { width: 100%; height: auto; max-height: 52vh; display: block; }

.sp .ghost { position: fixed; left: 0; top: 0; z-index: 2100; pointer-events: none; transform: translate(-50%, -140%); padding: 6px 14px; border-radius: 999px; background: var(--seat); border: 2px solid var(--gold); color: var(--ink); font: 800 1rem var(--font-body); box-shadow: 0 10px 24px rgba(0,0,0,.45); white-space: nowrap; }
.sp .toast { position: fixed; left: 50%; bottom: calc(18px + env(safe-area-inset-bottom, 0px)); transform: translateX(-50%); z-index: 2200; max-width: calc(100% - 32px); padding: 10px 16px; border-radius: 14px; background: #1B1336; border: 1px solid var(--line-2); color: var(--ink-2); font-weight: 800; font-size: .92rem; box-shadow: 0 12px 30px rgba(0,0,0,.4); opacity: 0; pointer-events: none; transition: opacity .2s; }
.sp .toast.show { opacity: 1; }
@media (prefers-reduced-motion: reduce) { .sp * { transition: none !important; } }

/* The tool prints as a PDF, not through the browser */
@media print { .sp { display: none !important; } }

/* A workspace, not an article: the page's 860px reading column is too narrow
   for a room plan beside its tools. */
body:has(#sp) .corpus-container { max-width: 1280px; }

/* Inside Class Progress's slide-out panel (an iframe: content/seating-page.js
   EMBED). Only the workspace shows; the page paints nothing of its own. */
html.sp-embed, html.sp-embed body { background: transparent; }
html.sp-embed body { padding: 0; }
html.sp-embed .corpus-container { max-width: none; padding: 0; margin: 0; }
html.sp-embed .sp { margin: 0; }
html.sp-embed .sp #room { max-height: none; }
html.sp-embed .sp .modal-back { place-items: start center; }