/* NIOS X — quiet, paper-and-ink styles. No framework, no web fonts.
   One accent (deep green); everything else is neutral. */
:root {
    --fg: #22211f;
    --fg-muted: #6b675f;
    --bg: #f7f5f0;
    --card: #fffefb;
    --accent: #234d40;
    --accent-hover: #183a30;
    --accent-tint: #e6ede9;
    --ok: #2f6b3a;
    --warn: #93650f;
    --err: #a3312b;
    --border: #e4dfd5;
    --border-strong: #cbc4b6;
    --serif: Charter, "Bitstream Charter", "Iowan Old Style", "Palatino Linotype", Palatino, "Sitka Text", Georgia, serif;
    --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    --radius: 4px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    background: var(--bg);
    color: var(--fg);
    font: 16px/1.6 var(--sans);
    -webkit-text-size-adjust: 100%;
    text-rendering: optimizeLegibility;
}
a { color: var(--accent); text-decoration: none; text-underline-offset: 0.18em; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.mono { font-family: var(--mono); font-size: 0.92em; }
.muted { color: var(--fg-muted); }
.small { font-size: 0.9rem; }

/* ─── top bar ─────────────────────────────────────────────────────────── */
.topbar {
    display: flex; align-items: center; flex-wrap: wrap; gap: 0.5rem 2rem;
    --gutter: clamp(1rem, 4vw, 2.5rem);
    padding: 0.9rem max(var(--gutter), calc((100% - 1100px) / 2 + var(--gutter)));
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}
.topbar .brand {
    font-family: var(--serif); font-size: 1.3rem; font-weight: 600;
    color: var(--fg); letter-spacing: 0.01em;
}
.topbar .brand span { color: var(--accent); margin-left: 0.18em; }
.topbar .brand:hover { text-decoration: none; }
.topbar nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1.4rem; align-items: center; }
.topbar nav a, .topbar nav summary {
    color: var(--fg-muted); font-size: 0.95rem; padding: 0.2rem 0;
    border-bottom: 1px solid transparent;
}
.topbar nav a:hover, .topbar nav summary:hover { color: var(--fg); text-decoration: none; }
.topbar nav a.on { color: var(--fg); border-bottom-color: var(--accent); }
.topbar .right { margin-left: auto; display: flex; align-items: center; gap: 1rem; font-size: 0.95rem; }
.topbar .user { color: var(--fg-muted); }
details.more { position: relative; }
details.more summary { list-style: none; cursor: pointer; }
details.more summary::-webkit-details-marker { display: none; }
details.more summary::after { content: " \25BE"; font-size: 0.75em; }
.more-menu {
    position: absolute; top: 2rem; left: 0; z-index: 20;
    min-width: 13rem; padding: 0.4rem 0;
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); box-shadow: 0 6px 20px rgba(34, 33, 31, 0.08);
}
.more-menu a { display: block; padding: 0.4rem 1rem; border: 0 !important; }
.more-menu a:hover { background: var(--bg); }
@media (max-width: 720px) {
    .topbar { gap: 0.5rem 1rem; }
    .topbar nav { order: 3; flex: 1 0 100%; gap: 0.25rem 1.1rem; }
    .more-menu { left: auto; right: 0; }
}

.linklike {
    background: none; border: none; color: var(--accent);
    cursor: pointer; font: inherit; padding: 0;
}
.linklike:hover { text-decoration: underline; }
.inline { display: inline; }

main {
    max-width: 1100px;
    margin: 2rem auto;
    padding: 0 clamp(1rem, 4vw, 2.5rem) 3rem;
}

h1, h2, h3, h4 { font-family: var(--serif); font-weight: 600; line-height: 1.25; letter-spacing: 0.005em; }
h1 { font-size: 2rem; }
h2 { font-size: 1.6rem; margin-top: 0; }
h3 { font-size: 1.2rem; }

.hero {
    text-align: center;
    padding: 3rem 1rem;
}
.hero h1 { font-size: 2.4rem; margin: 0 0 0.5rem; }

.btn {
    display: inline-block;
    padding: 0.55rem 1.1rem;
    background: var(--accent);
    color: #fff;
    border: 1px solid var(--accent);
    border-radius: var(--radius);
    text-decoration: none;
    cursor: pointer;
    font: inherit; font-size: 0.95rem; font-weight: 500;
    line-height: 1.3;
}
.btn:hover { background: var(--accent-hover); border-color: var(--accent-hover); text-decoration: none; }
.btn-block { display: block; width: 100%; }
.btn-ghost {
    background: transparent; color: var(--accent); border: 1px solid var(--border-strong);
}
.btn-ghost:hover { background: var(--card); border-color: var(--accent); }

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1.4rem;
    margin-bottom: 1rem;
}
.card.narrow { max-width: 420px; margin: 2rem auto; }
.card h2 { margin-top: 0; }
.card-ok { border-left: 3px solid var(--ok); }
.card-warn { border-left: 3px solid var(--err); }
.btn-small { padding: 0.25rem 0.6rem; font-size: 0.85em; }

label { display: block; margin-bottom: 0.75rem; }
input[type="text"], input[type="password"], input[type="number"], select, textarea {
    width: 100%; padding: 0.55rem 0.65rem; font: inherit;
    border: 1px solid var(--border-strong); border-radius: var(--radius);
    background: #fff; color: var(--fg);
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent-tint); border-color: var(--accent); }
form.filters {
    display: flex; gap: 0.75rem; flex-wrap: wrap; align-items: flex-end;
    margin-bottom: 1rem;
}
form.filters label { margin-bottom: 0; }

.error { color: var(--err); }
.ok    { color: var(--ok); }
.pending { color: var(--warn); }

.stat-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 0.75rem; margin: 1rem 0 1.5rem;
}
.stat {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 1rem; text-align: center;
}
.stat .n { font-size: 1.8rem; font-weight: 600; color: var(--accent); }
.stat .l { color: var(--fg-muted); font-size: 0.9rem; margin-top: 0.25rem; }
.stat-warn { border-color: var(--err); }
.stat-warn .n { color: var(--err); }

/* ─── difficulty dots ─────────────────────────────────────────────────── */
.diff-dots {
    font-family: var(--mono); letter-spacing: 0.05em; font-size: 0.8rem;
    color: var(--fg-muted);
}
.diff-1 { color: #2a8; }
.diff-2 { color: #6ab06a; }
.diff-3 { color: #c98; }
.diff-4 { color: #c75a2c; }
.diff-5 { color: var(--err); }

table.data {
    width: 100%; border-collapse: collapse; background: var(--card);
    border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
}
table.data th, table.data td {
    padding: 0.5rem 0.75rem; text-align: left;
    border-bottom: 1px solid var(--border);
    vertical-align: top; font-size: 0.93rem;
}
table.data th { background: #f1efe8; font-weight: 600; font-size: 0.85rem; letter-spacing: 0.02em; color: var(--fg-muted); }
table.data tr:last-child td { border-bottom: none; }

.pill {
    display: inline-block; padding: 0.05rem 0.5rem;
    background: #e6ede9; color: var(--accent);
    border-radius: 999px; font-size: 0.78rem; font-weight: 600;
    letter-spacing: 0.03em; text-transform: uppercase;
}
.pill-mcq       { background: #e9f5ee; color: var(--ok); }
.pill-vsa       { background: #fdf3d9; color: var(--warn); }
.pill-sa        { background: #e6ede9; color: var(--accent); }
.pill-la        { background: #fbe4e6; color: var(--err); }
.pill-numerical { background: #efe9f7; color: #6a3bb3; }
.pill-unknown   { background: #eee; color: #555; }
.pill-muted     { background: #eee; color: var(--fg-muted); text-transform: none; font-weight: 400; }
.pill-tma       { background: #e3f0ff; color: #1a5fb4; }
.pill-pub       { background: #f0f0f0; color: #555; }
.pill-warn      { background: #fdf3d9; color: var(--warn); text-transform: none; font-weight: 400; }
.pill-ok        { background: #e9f5ee; color: var(--ok); text-transform: none; font-weight: 400; }
.pill-err       { background: #fbe4e6; color: var(--err); text-transform: none; font-weight: 400; }
td.checks       { white-space: nowrap; }
td.checks .pill { margin-right: 0.2rem; font-size: 0.85rem; padding: 0.1rem 0.4rem; }

/* exam-mode top nav: prev / meta / next at a fixed position above the stem.
   Used in attempt_question.html and kept outside the card so its x/y
   doesn't shift as stem or options change length. */
.exam-topnav {
    display: flex; align-items: center; justify-content: space-between;
    gap: 1rem; padding: 0.5rem 0.75rem; margin: 0 0 0.75rem;
    border-bottom: 1px solid var(--border, #e0e0e0);
}
.exam-topnav-meta { flex: 1; text-align: center; color: var(--fg-muted); }
.exam-topnav-meta strong { color: var(--fg, #222); }
.exam-topnav .btn[disabled] { opacity: 0.35; cursor: not-allowed; }

/* analytics page */
.analytics-summary { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.75rem 0 1rem; }
.analytics-table td.num { text-align: right; white-space: nowrap; }
.analytics-table th.num { text-align: right; }
.cov-bar { display: inline-block; height: 6px; background: var(--accent); border-radius: 3px;
           vertical-align: middle; margin-left: 4px; opacity: 0.5; min-width: 2px; }

.analytics-filters {
    display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center;
    padding: 0.75rem 1rem;
}
.analytics-filters label.inline { margin: 0; }

.chapter-list { display: flex; flex-direction: column; gap: 0.5rem; margin-top: 0.5rem; }

.chapter-pill {
    border: 1px solid var(--border);
    border-left: 4px solid var(--border);
    border-radius: var(--radius);
    background: var(--card);
    padding: 0;
}
.chapter-pill > summary {
    list-style: none;
    cursor: pointer;
    padding: 0.6rem 0.9rem;
    display: flex; flex-wrap: wrap; gap: 0.75rem 1.25rem;
    align-items: center; justify-content: space-between;
}
.chapter-pill > summary::-webkit-details-marker { display: none; }
.chapter-pill[open] { border-left-width: 4px; }
.chapter-pill.chapter-high    { border-left-color: var(--ok); }
.chapter-pill.chapter-mid     { border-left-color: var(--warn); }
.chapter-pill.chapter-low     { border-left-color: var(--err); }
.chapter-pill.chapter-pending { border-left-color: var(--border); }

.pill-head { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: baseline; min-width: 0; }
.pill-head .lesson-num { font-family: ui-monospace, monospace; color: var(--fg-muted); font-size: 0.85rem; }
.pill-head .pill-title { font-size: 1.02rem; }
.pill-head .module-tag { font-size: 0.8rem; }

.pill-stats { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.stat-mini {
    min-width: 72px;
    padding: 0.3rem 0.6rem; border-radius: 8px; background: #f1efe8;
    text-align: center; line-height: 1.1;
}
.stat-mini-n { font-weight: 600; font-size: 1.05rem; }
.stat-mini-l { font-size: 0.72rem; color: var(--fg-muted); text-transform: uppercase; letter-spacing: 0.04em; }
.stat-mini.ok      { background: #e9f5ee; }
.stat-mini.ok .stat-mini-n { color: var(--ok); }
.stat-mini.high    { background: #e9f5ee; }
.stat-mini.high    .stat-mini-n { color: var(--ok); }
.stat-mini.mid     { background: #fdf3d9; }
.stat-mini.mid     .stat-mini-n { color: var(--warn); }
.stat-mini.low     { background: #fbe4e6; }
.stat-mini.low     .stat-mini-n { color: var(--err); }
.stat-mini.pending { background: #eee; }
.stat-mini.pending .stat-mini-n { color: var(--fg-muted); }
.stat-mini.muted   { opacity: 0.55; }
.stat-mini.admin-only { outline: 1px dashed var(--border); }

.pill-actions { padding: 0.5rem 0.9rem 0; display: flex; gap: 0.5rem; flex-wrap: wrap; }

table.analytics-qs { width: 100%; margin: 0.5rem 0; font-size: 0.92rem; }
table.analytics-qs th.num, table.analytics-qs td.num { text-align: right; white-space: nowrap; }
table.analytics-qs td.stem { font-size: 0.88rem; color: var(--fg-muted); }
table.analytics-qs tr.q-untouched td.stem { opacity: 0.7; }
table.analytics-qs tr.q-wrong   { background: #fef3f4; }
table.analytics-qs tr.q-right   { background: #f1f9f3; }
.pill-nios  { background: #e3f0ff; color: #1a5fb4; }
.pill-cbse  { background: #efe9f7; color: #6a3bb3; }
.pill-ncert { background: #fdf3d9; color: var(--warn); }
.pill-pending { background: #eee; color: var(--fg-muted); text-transform: none; font-weight: 400; }
dialog { border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem;
         max-width: 480px; width: 90%; box-shadow: 0 4px 24px rgba(0,0,0,.12); }
dialog::backdrop { background: rgba(0,0,0,.35); }

.q-detail header { margin-bottom: 1rem; color: var(--fg-muted); }
pre.stem {
    white-space: pre-wrap;
    word-break: break-word;
    overflow-wrap: break-word;
    background: var(--card);
    border: 1px solid var(--border);
    padding: 0.9rem;
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 0.95rem;
}
.options { padding-left: 1.2rem; }
.options li { margin: 0.15rem 0; }
.candidates { padding-left: 1.2rem; }
.candidates li { margin: 0.25rem 0; }

dl.meta { display: grid; grid-template-columns: 140px 1fr; gap: 0.25rem 1rem; }
dl.meta dt { color: var(--fg-muted); }

nav.pager { margin-top: 1rem; display: flex; gap: 1rem; align-items: center; }

.foot { text-align: center; color: var(--fg-muted); padding: 1.5rem 1rem 2.5rem; border-top: 1px solid var(--border); max-width: 1100px; margin: 0 auto; }

/* ─── mock-paper mode ─────────────────────────────────────────────────── */
.mock-header {
    display: flex; align-items: baseline; gap: 1.5rem;
    margin-bottom: 0.5rem;
}
.mock-timer { margin-left: auto; font-size: 0.95rem; }
.mock-timer strong {
    font-family: var(--mono); font-size: 1.2rem; color: var(--accent);
    padding: 0.1rem 0.45rem; background: #eef2ee; border-radius: var(--radius);
}

.mock-navigator {
    position: fixed; right: 0.75rem; top: 5rem;
    display: flex; flex-wrap: wrap; gap: 0.25rem;
    max-width: 12rem; padding: 0.6rem;
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.85rem; z-index: 10;
}
.mock-navigator strong { flex: 0 0 100%; color: var(--fg-muted); font-size: 0.8rem; margin-bottom: 0.25rem; }
.mock-navigator small { flex: 0 0 100%; margin-top: 0.3rem; font-size: 0.75rem; }
.nav-item {
    display: inline-block;
    min-width: 1.5rem; padding: 0.15rem 0.35rem;
    text-align: center;
    border: 1px solid var(--border-strong); border-radius: var(--radius);
    font-family: var(--mono); color: var(--fg);
}
.nav-item:hover { background: var(--bg); text-decoration: none; }
.nav-item.flagged {
    background: #fff3cd; border-color: #d5a100; color: #7a5600;
    font-weight: 700;
}

.mock-q { scroll-margin-top: 4rem; }
.mock-q header {
    display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap;
    color: var(--fg-muted); margin-bottom: 0.6rem;
}
.mock-q-flag { margin-left: auto; }
.flag-off { background: transparent; color: var(--fg-muted); border: 1px solid var(--border-strong); }
.flag-on  { background: #fff3cd; color: #7a5600; border: 1px solid #d5a100; }

.mock-footer { display: flex; gap: 1rem; align-items: center; margin-top: 1rem; }
.pause-banner { background: #fff3cd; border-color: #d5a100; color: #5a3d00; }
form[inert] { opacity: 0.5; pointer-events: none; }
.exit-ticket { background: #eef2ee; border-color: var(--accent); }
.btn-primary { background: var(--accent); color: white; border: none; font-weight: 600; }
.btn-primary:hover { background: var(--accent-hover); }

/* ─── review mode ─────────────────────────────────────────────────────── */
.review-summary { margin-bottom: 1rem; }
.review-detail { display: flex; flex-direction: column; gap: 1rem; }
.review-q { scroll-margin-top: 3rem; }
.review-q header {
    display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap;
    color: var(--fg-muted); margin-bottom: 0.75rem; font-size: 0.9rem;
}
.review-q h4 {
    margin: 0.5rem 0 0.3rem; font-size: 0.95rem; color: var(--fg-muted);
    text-transform: uppercase; letter-spacing: 0.04em;
}
.review-stem, .review-answer, .review-key, .review-grade { margin-bottom: 0.75rem; }
.review-correct { border-left: 3px solid var(--ok); }
.review-wrong   { border-left: 3px solid var(--err); }
.review-excerpt { background: #f7f5ea; }
.review-comment {
    margin: 0.25rem 0; padding: 0.5rem 0.8rem;
    border-left: 3px solid var(--fg-muted); color: var(--fg);
    background: #f7f7f7;
}
.review-nav { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 0.5rem; }
.ok { color: var(--ok); font-weight: 600; }
.warn { color: var(--warn); font-weight: 600; }
.err { color: var(--err); font-weight: 600; }
.pending { color: var(--fg-muted); font-style: italic; }

/* ─── chapter-tags editor ─────────────────────────────────────────────── */
.chapter-tags-grid {
    display: grid; grid-template-columns: 2fr 1fr; gap: 1rem;
    margin-top: 1rem;
}
.canonical-ref h4 { margin: 0.75rem 0 0.25rem; font-size: 0.9rem; }
.canonical-ref .lessons { padding-left: 1.2rem; margin: 0 0 0.5rem; }
.canonical-ref .lessons li { margin: 0.05rem 0; font-size: 0.85rem; }

/* ─── answer key panel ────────────────────────────────────────────────── */
.answer-key dl.meta { margin-bottom: 0.5rem; }
.ak-edit summary { cursor: pointer; padding: 0.35rem 0; color: var(--accent); }

/* ─── mastery table ───────────────────────────────────────────────────── */
.mastery-bar {
    position: relative; height: 1.3rem; width: 10rem;
    background: #eee; border-radius: var(--radius); overflow: hidden;
    font-size: 0.8rem;
}
.mastery-bar span {
    position: absolute; left: 0; top: 0; bottom: 0;
    background: linear-gradient(90deg, #c32, #c98, #2a8);
    background-size: 10rem 100%; background-position: 0 0;
}
.mastery-bar strong {
    position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
    color: var(--fg); text-shadow: 0 0 2px #fff, 0 0 4px #fff;
    font-weight: 700;
}
.mastery-row.mastery-high   td:nth-child(7) .mastery-bar span { background: #2a8; }
.mastery-row.mastery-mid    td:nth-child(7) .mastery-bar span { background: #c98; }
.mastery-row.mastery-low    td:nth-child(7) .mastery-bar span { background: #c55; }

/* ─── confidence picker ───────────────────────────────────────────────── */
.confidence-picker {
    display: flex; align-items: center; gap: 0.5rem;
    border: 1px solid var(--border); padding: 0.5rem; border-radius: var(--radius);
    background: #fbfaf6;
}
.confidence-picker legend { font-size: 0.8rem; color: var(--fg-muted); padding: 0 0.3rem; }
.confidence-picker label {
    display: inline-flex; align-items: center; gap: 0.2rem;
    padding: 0.2rem 0.5rem; cursor: pointer;
    border: 1px solid transparent; border-radius: var(--radius);
    font-size: 0.95rem;
}
.confidence-picker label:has(input:checked) { background: #e6ede9; border-color: var(--accent); }
.confidence-picker label input { margin: 0; }

/* ─── source page image ───────────────────────────────────────────────── */
.source-page-img {
    margin: 0.8rem 0 0; padding: 0;
    border: 1px solid var(--border); border-radius: var(--radius);
    overflow: hidden; max-width: 100%;
}
.source-page-img img {
    display: block; max-width: 100%; height: auto;
}
.source-page-img figcaption {
    padding: 0.2rem 0.5rem; font-size: 0.8rem; background: var(--bg-card);
}

/* ─── trend sparkline ─────────────────────────────────────────────────── */
.trend-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
    gap: 1rem; margin-top: 0.5rem;
}
.sparkline {
    display: block; margin-top: 0.3rem;
    background: #fbfaf6; border: 1px solid var(--border);
    border-radius: var(--radius);
}

/* ── All-answers panel ────────────────────────────────────────────── */
.answers-panel { margin: 1rem 0; }
.answers-panel .ap-title { margin: 0 0 .5rem 0; font-size: 1rem; }
.answers-panel .ap-row {
    border: 1px solid var(--border); border-radius: var(--radius);
    padding: .5rem .75rem; margin-bottom: .4rem; background: #fff;
}
.answers-panel .ap-row-truth { border-left: 4px solid #2563eb; background: #f5f8ff; }
.answers-panel .ap-row-gemini { border-left: 4px solid #7c3aed; }
.answers-panel .ap-row-rag { border-left: 4px solid #059669; }
.answers-panel .ap-row-parser { border-left: 4px solid #6b7280; }
.answers-panel .ap-label { font-weight: 600; margin-right: .5rem; }
.answers-panel .ap-tier {
    display: inline-block; font-size: .75rem; padding: 0 .4rem;
    border-radius: 3px; background: #eef; margin-right: .5rem;
    text-transform: uppercase;
}
.answers-panel .ap-tier.tier-gemini_pro { background: #ede9fe; color: #5b21b6; }
.answers-panel .ap-tier.tier-gemini_flash { background: #fae8ff; color: #86198f; }
.answers-panel .ap-tier.tier-rag { background: #d1fae5; color: #065f46; }
.answers-panel .ap-tier.tier-parser { background: #e5e7eb; color: #374151; }
.answers-panel .ap-timestamp { font-size: .8rem; color: #6b7280; margin-right: .5rem; }
.answers-panel .ap-source { font-size: .8rem; color: #374151; }
.answers-panel .ap-flag {
    display: inline-block; font-size: .75rem; padding: 0 .4rem;
    border-radius: 3px; background: #fef3c7; color: #92400e; margin-left: .25rem;
}
.answers-panel .ap-answer { margin-top: .3rem; word-break: break-word; }
.answers-panel .ap-notes { color: #6b7280; margin-top: .25rem; }
.answers-panel .ap-empty { color: #6b7280; font-style: italic; }

/* ─── landing + sign-in ───────────────────────────────────────────────── */
.eyebrow {
    margin: 0 0 0.75rem; color: var(--accent);
    font-size: 0.8rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase;
}
.landing-hero { max-width: 44rem; padding: clamp(2rem, 7vw, 5rem) 0 clamp(2rem, 5vw, 3.5rem); }
.landing-hero h1 {
    font-size: clamp(2.1rem, 5.5vw, 3.3rem); line-height: 1.12;
    font-weight: 500; margin: 0 0 1.25rem; letter-spacing: -0.005em;
}
.lede { font-size: clamp(1.05rem, 2.2vw, 1.2rem); color: var(--fg-muted); max-width: 38rem; margin: 0; }

.doors {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(min(17rem, 100%), 1fr));
    gap: 1rem; margin-bottom: clamp(3rem, 8vw, 5rem);
}
.door {
    display: flex; flex-direction: column; gap: 0.5rem;
    padding: 1.6rem 1.6rem 1.4rem;
    background: var(--card); color: var(--fg);
    border: 1px solid var(--border); border-radius: var(--radius);
    transition: border-color 0.15s ease;
}
.door:hover { border-color: var(--accent); text-decoration: none; }
.door-kicker { font-size: 0.8rem; color: var(--fg-muted); letter-spacing: 0.08em; text-transform: uppercase; }
.door-title { font-family: var(--serif); font-size: 1.55rem; font-weight: 600; }
.door-text { color: var(--fg-muted); flex: 1; }
.door-cta { margin-top: 0.6rem; color: var(--accent); font-weight: 500; }
.door:hover .door-cta { text-decoration: underline; }

.features {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(min(15rem, 100%), 1fr));
    gap: 1.5rem 2.5rem; padding-top: 2rem; border-top: 1px solid var(--border);
}
.features h3 { margin: 0 0 0.4rem; font-size: 1.1rem; }
.features p { margin: 0; color: var(--fg-muted); font-size: 0.95rem; }
.landing-note { margin-top: 3rem; color: var(--fg-muted); font-size: 0.9rem; }

.signin { max-width: 24rem; margin: clamp(1.5rem, 8vw, 5rem) auto 0; }
.signin h1 { font-size: 2rem; margin: 0 0 1.5rem; font-weight: 500; }
.signin-form {
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 1.5rem; margin-bottom: 1rem;
}
.signin-form label { font-size: 0.9rem; color: var(--fg-muted); margin-bottom: 0.35rem; }
.signin-form input[type="password"] { font-size: 1.25rem; letter-spacing: 0.3em; padding: 0.6rem 0.75rem; margin-bottom: 1rem; }
.signin-form .error { margin: -0.5rem 0 1rem; font-size: 0.92rem; }

nav.crumbs { display: flex; flex-wrap: wrap; gap: 0.4rem 1.5rem; margin: -0.5rem 0 1.25rem; font-size: 0.95rem; }
.stat .n { font-family: var(--serif); font-weight: 500; }

.reviewed-mark { color: var(--accent); font-weight: 500; }
.card.notice { border-left: 3px solid var(--accent); }
ul.plain { list-style: none; padding: 0; margin: 0; }
ul.plain li { padding: 0.25rem 0; }
.table-scroll { overflow-x: auto; }

/* ─── paper marking ───────────────────────────────────────────────────── */
.lede-small { max-width: 44rem; }
.pm-form { max-width: 40rem; }
.pm-list { margin: 0 0 1rem; padding-left: 1.2rem; color: var(--fg-muted); }
.pm-pages { display: flex; gap: 0.5rem; overflow-x: auto; padding: 0.25rem 0 1rem; }
.pm-pages img { height: 150px; width: auto; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; }
.pm-file { display: inline-flex; align-items: center; height: 150px; padding: 0 1rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--card); }
.pm-q { padding: 0.9rem 0; border-bottom: 1px solid var(--border); }
.pm-q-head { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }
.pm-stem { margin: 0.3rem 0 0.5rem; }
.pm-blank textarea, .pm-blank .pm-mcq { background: var(--bg); }
.pm-unclear { background: #fbf3f1; padding-left: 0.6rem; padding-right: 0.6rem; }
.pm-mcq { max-width: 8rem; display: block; }
.pm-opts { display: flex; flex-wrap: wrap; gap: 0.2rem 1.25rem; margin-top: 0.4rem; }
.pm-count { display: flex; gap: 0.4rem; align-items: baseline; margin: 0.4rem 0 0; color: var(--fg-muted); }
.pm-actions { display: flex; flex-wrap: wrap; gap: 0.75rem 1.25rem; align-items: center; padding: 1.25rem 0; }
.pm-form input[type="file"] { display: block; margin-top: 0.4rem; max-width: 100%; }

/* ─── chapters completed ──────────────────────────────────────────────── */
.progress-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(10rem, 100%), 1fr)); gap: 0.6rem; margin: 0 0 1.25rem; }
.progress-tile { display: flex; flex-direction: column; gap: 0.2rem; padding: 0.75rem 0.9rem;
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); color: var(--fg); }
.progress-tile:hover { border-color: var(--accent); text-decoration: none; }
.progress-tile.on { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.progress-tile.overall { background: transparent; }
.pt-label { font-size: 0.9rem; color: var(--fg-muted); }
.pt-pct { font-family: var(--serif); font-size: 1.5rem; line-height: 1.1; }
.pt-bar { display: block; height: 4px; background: var(--border); border-radius: 2px; overflow: hidden; }
.pt-bar > span { display: block; height: 100%; background: var(--accent); }
.pt-sub { font-size: 0.8rem; color: var(--fg-muted); }
.progress-grid.compact { margin-bottom: 0.5rem; }
.progress-grid.compact .pt-pct { font-size: 1.2rem; }
.chapter-toolbar { display: flex; flex-wrap: wrap; gap: 0.75rem 1.25rem; align-items: center; margin-bottom: 0.75rem; }
.chapter-toolbar h3 { margin: 0; }
.chapter-bulk { margin-left: auto; display: flex; gap: 0.5rem; }
nav.seg { display: inline-flex; border: 1px solid var(--border-strong); border-radius: var(--radius); overflow: hidden; font-size: 0.88rem; }
nav.seg a { padding: 0.3rem 0.75rem; color: var(--fg-muted); border-right: 1px solid var(--border); }
nav.seg a:last-child { border-right: 0; }
nav.seg a.on { background: var(--accent); color: #fff; }
nav.seg a:hover { text-decoration: none; }
.chapter-group { border: 0; padding: 0; margin: 0 0 1rem; }
.chapter-group legend { font-size: 0.85rem; color: var(--fg-muted); padding: 0; margin-bottom: 0.25rem; }
.chapter-row { display: flex; align-items: center; gap: 0.65rem; padding: 0.45rem 0.25rem; margin: 0;
    border-bottom: 1px solid var(--border); cursor: pointer; }
.chapter-row:hover { background: var(--bg); }
.chapter-row input { width: 1.1rem; height: 1.1rem; accent-color: var(--accent); flex: none; }
.ch-num { font-family: var(--mono); font-size: 0.85rem; color: var(--fg-muted); min-width: 1.6rem; }
.ch-title { flex: 1; }
.chapter-actions { display: flex; gap: 1rem; align-items: center; padding-top: 0.75rem;
    position: sticky; bottom: 0; background: var(--card); }

/* ─── practice + schedule ─────────────────────────────────────────────── */
.practice-list { margin: 0 0 1rem; }
.practice-row { display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; align-items: center; justify-content: space-between;
    padding: 0.8rem 0; border-bottom: 1px solid var(--border); }
.practice-row.is-selected { background: var(--card); padding-left: 0.6rem; padding-right: 0.6rem; }
.week-strip { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 0.35rem; margin: 0.5rem 0; }
.day { display: flex; flex-direction: column; gap: 0.15rem; padding: 0.5rem 0.45rem; min-width: 0;
    border: 1px solid var(--border); border-radius: var(--radius); background: var(--card); font-size: 0.85rem; }
.day-name { color: var(--fg-muted); font-size: 0.78rem; }
.day-name small { display: block; }
.day-subj { font-weight: 500; overflow-wrap: anywhere; }
.day-mark { font-size: 0.78rem; color: var(--fg-muted); }
.day.is-today { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.day-done { background: var(--accent-tint); }
.day-done .day-mark { color: var(--ok); font-weight: 600; }
.day-missed .day-mark { color: var(--err); }
.day-free { background: transparent; }
.week-foot { margin: 0.25rem 0 0.75rem; }
.week-actions { display: flex; flex-wrap: wrap; gap: 0.6rem 1rem; align-items: center; }
.dots { display: inline-flex; gap: 3px; margin-right: 0.4rem; vertical-align: middle; }
.dot { width: 10px; height: 10px; border-radius: 50%; border: 1px solid var(--border-strong); }
.dot-done { background: var(--ok); border-color: var(--ok); }
.dot-missed { background: #eed6d3; border-color: var(--err); }
.dot-today { border-color: var(--accent); }
@media (max-width: 560px) {
    .week-strip { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .chapter-bulk { margin-left: 0; }
}
.paper-cell + .paper-cell { margin-top: 0.3rem; }
fieldset.exam-dates { border: 1px solid var(--border); border-radius: var(--radius); padding: 0.75rem 1rem; margin: 0 0 1rem;
    display: grid; grid-template-columns: repeat(auto-fill, minmax(min(14rem, 100%), 1fr)); gap: 0 1rem; }
fieldset.exam-dates legend { font-size: 0.9rem; color: var(--fg-muted); padding: 0 0.3rem; }
input[type="date"] { padding: 0.45rem 0.6rem; font: inherit; border: 1px solid var(--border-strong); border-radius: var(--radius); background: #fff; display: block; margin-top: 0.25rem; }