/* NCA Edge playground — ported from prototype design language */
:root {
  --paper: #F7F8F6; --card: #FFFFFF; --ink: #1C2426; --ink-2: #52615C;
  --line: #DFE5E0; --accent: #1D5C4A; --accent-ink: #FFFFFF; --accent-soft: #E4EFE8;
  --earn: #1D6E50; --earn-bg: #E2F0E8; --lose: #A8353F; --lose-bg: #F7E4E5;
  --part: #91671A; --part-bg: #F4EAD2;
  --shadow: 0 1px 2px rgba(28,36,38,.05), 0 8px 28px rgba(28,36,38,.07);
  --serif: 'Iowan Old Style', 'Palatino Linotype', Palatino, Georgia, serif;
  --sans: system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
  --mono: ui-monospace, 'SF Mono', 'Cascadia Mono', Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #131917; --card: #1B2321; --ink: #E7ECE9; --ink-2: #9CAAA3;
    --line: #2C3733; --accent: #5BBB95; --accent-ink: #0E1512; --accent-soft: #1E362C;
    --earn: #63C29B; --earn-bg: #1E352B; --lose: #E4838C; --lose-bg: #3A2327;
    --part: #D8A853; --part-bg: #372F1B;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 28px rgba(0,0,0,.35);
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.6; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }
.muted { color: var(--ink-2); font-size: 13px; }

header { border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; background: var(--paper); }
.nav { display: flex; align-items: center; gap: 18px; height: 58px; }
.wordmark { font-family: var(--serif); font-size: 20px; font-weight: 700; color: var(--ink); }
.wordmark em { font-style: normal; color: var(--accent); }
.proto-chip { font: 600 10px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-2); border: 1px solid var(--line); border-radius: 99px; padding: 4px 8px; }
.nav-links { margin-left: auto; display: flex; gap: 16px; }
.nav-links a { color: var(--ink-2); font-size: 14px; font-weight: 500; }

main { padding: 36px 20px 60px; }
h1 { font-family: var(--serif); font-size: clamp(24px, 3.5vw, 32px); line-height: 1.2; margin: 0 0 6px; }
h2 { font-family: var(--serif); font-size: 21px; margin: 26px 0 10px; }
.eyebrow { font-family: var(--mono); font-size: 11px; letter-spacing: .13em; text-transform: uppercase; color: var(--accent); margin: 0 0 10px; }

.btn { display: inline-block; font: 600 14.5px/1 var(--sans); padding: 12px 20px; border-radius: 6px; border: 1px solid transparent; cursor: pointer; }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }
.btn-ghost { border-color: var(--line); color: var(--ink); background: transparent; }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 20px 22px; box-shadow: var(--shadow); }

/* question list */
.qgroup { margin-bottom: 30px; }
.qrow { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); margin-bottom: 8px; }
.qrow:hover { border-color: var(--accent); }
.qrow a { color: var(--ink); font-weight: 600; flex: 1; font-size: 15px; }
.qmeta { font-family: var(--mono); font-size: 11.5px; color: var(--ink-2); white-space: nowrap; }
.type-chip { font: 700 10px/1 var(--mono); letter-spacing: .07em; text-transform: uppercase; border-radius: 99px; padding: 4px 9px; background: var(--accent-soft); color: var(--accent); white-space: nowrap; }
.attempt-chip { font: 600 10.5px/1 var(--mono); border-radius: 99px; padding: 4px 8px; white-space: nowrap; }
.band-strong, .band-pass { background: var(--earn-bg); color: var(--earn); }
.band-borderline { background: var(--part-bg); color: var(--part); }
.band-fail { background: var(--lose-bg); color: var(--lose); }

/* question page */
.qprompt { font-family: var(--serif); font-size: 16.5px; line-height: 1.7; white-space: pre-wrap; }
.exam-bar { display: flex; align-items: center; gap: 16px; margin: 18px 0 10px; flex-wrap: wrap; }
.timer { font: 700 22px/1 var(--mono); font-variant-numeric: tabular-nums; padding: 8px 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); }
.timer.warn { color: var(--part); border-color: var(--part); }
.timer.over { color: var(--lose); border-color: var(--lose); }
textarea.answer { width: 100%; min-height: 320px; padding: 16px; font: 15.5px/1.65 var(--sans); color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 10px; resize: vertical; }
textarea.answer:focus { border-color: var(--accent); outline: none; }
.wordcount { font-family: var(--mono); font-size: 11.5px; color: var(--ink-2); }

.grading-wait { text-align: center; padding: 34px 24px; }
.progress { height: 8px; background: var(--line); border-radius: 99px; overflow: hidden; max-width: 420px; margin: 14px auto; }
.progress i { display: block; height: 100%; background: var(--accent); border-radius: 99px; transition: width .8s ease; }
@media (prefers-reduced-motion: reduce) { .progress i { transition: none; } }

/* grade report */
.report-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.total { font-family: var(--serif); font-size: 42px; font-weight: 700; line-height: 1; margin: 10px 0 2px; }
.total small { font-size: 20px; color: var(--ink-2); font-weight: 400; }
.band { font: 700 11px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; border-radius: 99px; padding: 5px 10px; }
.dim { margin-bottom: 11px; }
.dim-row { display: flex; justify-content: space-between; font-size: 13.5px; margin-bottom: 4px; }
.dim-row .score { font-family: var(--mono); font-size: 12px; color: var(--ink-2); }
.bar { height: 5px; background: var(--line); border-radius: 99px; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--accent); border-radius: 99px; }
.bar i.warn { background: var(--part); }
.bar i.bad { background: var(--lose); }
.floors { font-size: 13px; color: var(--lose); margin-top: 8px; }

/* marked script */
.script { font-family: var(--serif); font-size: 16px; line-height: 1.8; white-space: pre-wrap; }
.mk { border-bottom: 2px solid; padding-bottom: 1px; cursor: pointer; }
.mk-earned { border-color: var(--earn); background: color-mix(in srgb, var(--earn-bg) 55%, transparent); }
.mk-lost { border-color: var(--lose); border-bottom-style: dashed; background: color-mix(in srgb, var(--lose-bg) 40%, transparent); }
.mk-partial { border-color: var(--part); background: color-mix(in srgb, var(--part-bg) 55%, transparent); }
.mk-ref { font: 700 10px/1 var(--mono); vertical-align: super; padding: 1px 4px; border-radius: 3px; margin-left: 1px; }
.ref-earned { color: var(--earn); background: var(--earn-bg); }
.ref-lost { color: var(--lose); background: var(--lose-bg); }
.ref-partial { color: var(--part); background: var(--part-bg); }
.note { background: var(--card); border: 1px solid var(--line); border-left-width: 3px; border-radius: 8px; padding: 11px 13px; font-size: 13px; color: var(--ink-2); margin-bottom: 8px; }
.note b { color: var(--ink); }
.note.hl { border-color: var(--accent); box-shadow: var(--shadow); }
.note-earned { border-left-color: var(--earn); }
.note-lost { border-left-color: var(--lose); }
.note-partial { border-left-color: var(--part); }
.tag { display: inline-block; font: 700 9.5px/1 var(--mono); letter-spacing: .07em; text-transform: uppercase; margin-bottom: 5px; padding: 3px 6px; border-radius: 3px; }
.tag-earned { color: var(--earn); background: var(--earn-bg); }
.tag-lost { color: var(--lose); background: var(--lose-bg); }
.tag-partial { color: var(--part); background: var(--part-bg); }

.summary-card { background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line)); border-radius: 10px; padding: 18px 22px; margin-top: 20px; }
.summary-card h3 { font-family: var(--serif); margin: 0 0 8px; font-size: 17px; }
.summary-card ol { margin: 8px 0 0; padding-left: 20px; font-size: 14.5px; }
.summary-card li { margin-bottom: 6px; }

/* result layout: scorecard + summary on top (equal heights), marked script + aligned gutter below */
.result-top { display: grid; grid-template-columns: 300px 1fr; gap: 18px; align-items: stretch; margin-bottom: 18px; }
.result-top > * { min-width: 0; }
.anno-layout > * { min-width: 0; }
.result-top .summary-card { margin-top: 0; }
.report-head .qmeta { white-space: normal; }
.card, .summary-card, .note { overflow-wrap: break-word; }
.anno-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 18px; align-items: start; }
.anno-gutter.aligned { position: relative; }
.anno-gutter.aligned .note { position: absolute; left: 0; right: 0; margin: 0; transition: top .25s ease; }
@media (prefers-reduced-motion: reduce) { .anno-gutter.aligned .note { transition: none; } }
@media (max-width: 899px) { .result-top, .anno-layout { grid-template-columns: 1fr; } }

/* notes panel */
.notes-panel { position: fixed; bottom: 0; left: 0; right: 0; background: var(--card); border-top: 2px solid var(--accent); padding: 16px 20px; z-index: 20; box-shadow: 0 -8px 28px rgba(0,0,0,.15); }
.notes-panel h3 { margin: 0 0 8px; font-family: var(--serif); }
.notes-panel textarea { width: 100%; font: 14px/1.5 var(--sans); padding: 10px; background: var(--paper); color: var(--ink); border: 1px solid var(--line); border-radius: 6px; }
.notes-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 8px; }

/* gate */
.gate { max-width: 420px; margin: 60px auto; text-align: center; }
.gate input { width: 100%; padding: 12px 14px; font: 16px var(--mono); border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--ink); margin: 14px 0; text-align: center; }

footer { border-top: 1px solid var(--line); padding: 22px 0 34px; }
.error-box { background: var(--lose-bg); color: var(--lose); border-radius: 8px; padding: 12px 16px; font-size: 14px; }