/* Deutschlerner — notes-app shell + note typography.
 * Layout: sidebar (chapter tree) | pane (topbar + note). Phones: sidebar becomes a drawer.
 * Theme: light by default from the system; [data-theme] on <html> overrides (set by theme.js). */

/* ---------- tokens: light ---------- */
:root {
  color-scheme: light;
  --bg: #ffffff;
  --side: #f7f7f5;
  --raised: #fbfbfa;
  --hover: #ededeb;
  --select: #e6e5e1;
  --text: #24231f;
  --text-2: #4c4b46;
  --muted: #6e6d68;
  --border: #e6e5e1;
  --border-strong: #d4d3ce;
  --accent: #9a6a00;          /* German-flag gold, darkened for contrast */
  --accent-ink: #ffffff;
  --accent-soft: #fbf3df;
  --link: #2b5fa8;
  --focus: #9a6a00;
  --der: #1f5fbf;
  --die: #c0312b;
  --das: #2c7a33;
  --pl:  #7a4bb0;
  --ok: #2c7a33;
  --ok-soft: #e8f3e8;
  --warn: #9a5b00;
  --warn-soft: #fbf0df;
  --info: #2b5fa8;
  --info-soft: #e9f0fa;
  --ml: #8a3d74;              /* hint language: Malayalam */
  --ml-soft: #f7ebf3;
  --shadow: 0 1px 2px rgba(20, 20, 15, 0.06), 0 8px 24px rgba(20, 20, 15, 0.08);
  --radius: 8px;
  --side-w: 288px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

/* ---------- tokens: dark ---------- */
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #191919; --side: #202020; --raised: #232323; --hover: #2c2c2c; --select: #343434;
  --text: #e8e7e3; --text-2: #cfcdc8; --muted: #9d9b95; --border: #2f2f2e; --border-strong: #3d3d3b;
  --accent: #e2b341; --accent-ink: #1a1500; --accent-soft: #33291a; --link: #8db7f0; --focus: #e2b341;
  --der: #82b1f5; --die: #f28b82; --das: #81c995; --pl: #c7a4ef;
  --ok: #81c995; --ok-soft: #1f2d22; --warn: #f0b860; --warn-soft: #33291a; --info: #8db7f0; --info-soft: #1d2836;
  --ml: #e7a3d2; --ml-soft: #34222f;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 30px rgba(0, 0, 0, 0.45);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #191919; --side: #202020; --raised: #232323; --hover: #2c2c2c; --select: #343434;
    --text: #e8e7e3; --text-2: #cfcdc8; --muted: #9d9b95; --border: #2f2f2e; --border-strong: #3d3d3b;
    --accent: #e2b341; --accent-ink: #1a1500; --accent-soft: #33291a; --link: #8db7f0; --focus: #e2b341;
    --der: #82b1f5; --die: #f28b82; --das: #81c995; --pl: #c7a4ef;
    --ok: #81c995; --ok-soft: #1f2d22; --warn: #f0b860; --warn-soft: #33291a; --info: #8db7f0; --info-soft: #1d2836;
    --ml: #e7a3d2; --ml-soft: #34222f;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 30px rgba(0, 0, 0, 0.45);
  }
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16.5px/1.65 var(--sans); }
::selection { background: var(--accent-soft); color: var(--text); }
a { color: var(--link); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
code, kbd { font-family: var(--mono); font-size: 0.9em; }
button { font: inherit; color: inherit; }
* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
svg.i { width: 18px; height: 18px; flex: none; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- shell ---------- */
.app { display: grid; grid-template-columns: var(--side-w) 1fr; min-height: 100vh; }
.sidebar {
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
  background: var(--side); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; padding: 14px 10px 24px;
}
.pane { min-width: 0; display: flex; flex-direction: column; }

.side-brand { display: flex; align-items: center; gap: 8px; padding: 4px 8px 12px; font-weight: 650; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.side-brand .mark { width: 22px; height: 22px; border-radius: 6px; background: var(--accent); color: var(--accent-ink); display: grid; place-items: center; font-size: 12px; font-weight: 800; }
.side-search { position: relative; margin: 0 4px 10px; }
.side-search svg { position: absolute; left: 9px; top: 50%; transform: translateY(-50%); width: 15px; height: 15px; color: var(--muted); }
.side-search input {
  width: 100%; font: inherit; font-size: 0.9rem; padding: 6px 10px 6px 30px; border-radius: 6px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text);
}
.side-search input::placeholder { color: var(--muted); }
.side-label { font-size: 0.75rem; font-weight: 600; color: var(--muted); padding: 14px 8px 4px; }
.side-label-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.side-levels { display: flex; gap: 3px; }
.side-levels .chip { padding: 2px 7px; font-size: 0.7rem; font-weight: 650; line-height: 1.3; }
.chip.lvchip.A1 { color: var(--das); } .chip.lvchip.A2 { color: var(--der); } .chip.lvchip.B1 { color: var(--accent); }
.chip.lvchip.on { color: var(--bg); }
.chip.lvchip.A1.on { background: var(--das); border-color: var(--das); }
.chip.lvchip.A2.on { background: var(--der); border-color: var(--der); }
.chip.lvchip.B1.on { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.side-link, .folder-head, .chap {
  display: flex; align-items: center; gap: 8px; width: 100%; text-align: left;
  padding: 5px 8px; border-radius: 6px; color: var(--text-2); text-decoration: none;
  border: 0; background: none; cursor: pointer; font-size: 0.93rem; line-height: 1.35;
}
.side-link:hover, .folder-head:hover, .chap:hover { background: var(--hover); color: var(--text); }
.side-link.active, .chap.active { background: var(--select); color: var(--text); font-weight: 600; }
.side-link.soon { opacity: 0.5; cursor: default; }
.side-link.soon:hover { background: none; }
.side-link .soon-tag { margin-left: auto; font-size: 0.72rem; color: var(--muted); }
.folder-head { font-weight: 600; color: var(--text); }
.folder-head .chev { width: 14px; height: 14px; transition: transform 160ms cubic-bezier(.2,.8,.2,1); color: var(--muted); }
.folder.open > .folder-head .chev { transform: rotate(90deg); }
.folder-head .count { margin-left: auto; font-size: 0.78rem; color: var(--muted); font-weight: 500; font-variant-numeric: tabular-nums; }
.folder-body { display: none; padding: 2px 0 6px 10px; }
.folder.open > .folder-body { display: block; }
.chap { font-size: 0.9rem; padding: 4px 8px; }
.chap .t { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chap.missing { opacity: 0.55; }
.side-foot { margin-top: auto; padding: 16px 8px 0; font-size: 0.78rem; color: var(--muted); }

/* status pie (sidebar + topbar) */
.pie { width: 14px; height: 14px; flex: none; }
.pie circle.ring { fill: none; stroke: var(--border-strong); stroke-width: 1.6; }
.pie path { fill: var(--accent); }
.pie.s3 circle.full { fill: var(--ok); }
.pie.s3 path.tick { fill: none; stroke: var(--bg); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- topbar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 10px;
  padding: 10px 28px; min-height: 52px; background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: saturate(1.4) blur(8px); -webkit-backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--border);
}
.crumbs { display: flex; align-items: center; gap: 6px; font-size: 0.9rem; color: var(--muted); min-width: 0; overflow: hidden; white-space: nowrap; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--text); }
.crumbs .sep { opacity: 0.5; }
.crumbs .cur { color: var(--text); overflow: hidden; text-overflow: ellipsis; }
.top-actions { margin-left: auto; display: flex; align-items: center; gap: 6px; }
.icon-btn {
  display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 6px;
  border: 1px solid transparent; background: none; cursor: pointer; color: var(--text-2);
}
.icon-btn:hover { background: var(--hover); color: var(--text); }
.menu-btn { display: none; }
.status-pick { display: inline-flex; align-items: center; gap: 6px; padding: 0 4px 0 8px; height: 34px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg); }
.status-pick select { font: inherit; font-size: 0.88rem; border: 0; background: none; color: var(--text); padding: 4px 2px; cursor: pointer; }
.status-pick select:focus-visible { outline: none; }
.status-pick:focus-within { outline: 2px solid var(--focus); outline-offset: 1px; }

/* ---------- note area ---------- */
main { width: 100%; max-width: none; margin: 0; padding: 36px 56px 120px; }
main.narrow { max-width: none; }
.note-head { max-width: 75ch; }
h1 { font-size: clamp(1.9rem, 2.6vw, 2.5rem); line-height: 1.15; letter-spacing: -0.025em; margin: 6px 0 8px; font-weight: 700; text-wrap: balance; }
h2 { font-size: 1.45rem; line-height: 1.25; letter-spacing: -0.015em; margin: 44px 0 12px; font-weight: 680; text-wrap: balance; }
h3 { font-size: 1.1rem; margin: 30px 0 8px; font-weight: 650; }
.lead { font-size: 1.12rem; color: var(--text-2); margin: 0 0 8px; }
.muted { color: var(--muted); }
.small { font-size: 0.9rem; }
main p, main li { max-width: 75ch; }
main ul, main ol { padding-left: 1.3em; }
main li + li { margin-top: 4px; }

/* ---------- boxes (callouts) ---------- */
.box {
  --tone: var(--accent); --tone-soft: var(--accent-soft);
  background: var(--tone-soft); border-radius: var(--radius); padding: 14px 18px; margin: 18px 0; max-width: 80ch;
}
.box.ok { --tone: var(--ok); --tone-soft: var(--ok-soft); }
.box.warn { --tone: var(--warn); --tone-soft: var(--warn-soft); }
.box.info { --tone: var(--info); --tone-soft: var(--info-soft); }
.box.ml { --tone: var(--ml); --tone-soft: var(--ml-soft); }
[data-hint][hidden] { display: none !important; } /* hint boxes appear only when the admin switched that language on */
.box > :first-child { margin-top: 0; }
.box > :last-child { margin-bottom: 0; }
.box-title { display: block; font-weight: 650; color: var(--tone); margin-bottom: 4px; }
.box p, .box li { max-width: none; }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; margin: 14px 0; max-width: 100%; }
table { border-collapse: separate; border-spacing: 0; width: auto; min-width: min(100%, 520px); max-width: 100%; font-size: 0.96rem; font-variant-numeric: tabular-nums; }
th, td { border-bottom: 1px solid var(--border); padding: 8px 14px 8px 0; text-align: left; vertical-align: top; }
th { font-weight: 600; color: var(--text-2); font-size: 0.85rem; border-bottom-color: var(--border-strong); }
tbody tr:last-child td, table tr:last-child td { border-bottom: 0; }
td.c, th.c { text-align: center; padding-left: 8px; padding-right: 8px; }
tr.hl td, tr.hl th { background: var(--accent-soft); }
tr.hl td:first-child, tr.hl th:first-child { padding-left: 8px; border-radius: 6px 0 0 6px; }
.rows-hidden tr.extra { display: none; }
.show-rows {
  margin: 4px 0 18px; font-size: 0.9rem; border: 1px solid var(--border); background: var(--bg);
  border-radius: 999px; padding: 5px 14px; cursor: pointer; color: var(--text-2);
}
.show-rows:hover { background: var(--hover); color: var(--text); }

/* ---------- gender & marks ---------- */
.der { color: var(--der); font-weight: 600; }
.die { color: var(--die); font-weight: 600; }
.das { color: var(--das); font-weight: 600; }
.pl  { color: var(--pl);  font-weight: 600; }
.end { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 3px; font-weight: 700; }
.wrong { color: var(--die); text-decoration: line-through; text-decoration-thickness: 1px; }
.right { color: var(--ok); font-weight: 600; }

/* ---------- examples ---------- */
.ex { list-style: none; padding: 0 !important; margin: 10px 0; display: grid; gap: 10px; }
.ex li { margin: 0 !important; padding: 0 0 0 14px; position: relative; }
.ex li::before { content: ""; position: absolute; left: 0; top: 0.75em; width: 6px; height: 6px; border-radius: 50%; background: var(--border-strong); }
.ex .de { display: block; font-weight: 500; }
.ex .en { display: block; color: var(--muted); font-size: 0.92rem; }

/* ---------- level badges ---------- */
.lvl { display: inline-block; font-size: 0.72rem; font-weight: 700; padding: 1px 7px; border-radius: 5px; vertical-align: 2px; border: 1px solid currentColor; }
.lvl.A1 { color: var(--das); } .lvl.A2 { color: var(--der); } .lvl.B1 { color: var(--accent); }
.chapter-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; color: var(--muted); font-size: 0.88rem; }
.chapter-meta [data-chapter-status] { display: none; }

/* ---------- self-check ---------- */
details.check { border: 1px solid var(--border); border-radius: var(--radius); padding: 0; margin: 8px 0; max-width: 75ch; background: var(--raised); }
details.check summary { cursor: pointer; padding: 11px 14px; list-style: none; display: flex; gap: 10px; align-items: baseline; }
details.check summary::-webkit-details-marker { display: none; }
details.check summary::before { content: "+"; font-weight: 700; color: var(--accent); width: 1ch; flex: none; }
details.check[open] summary::before { content: "–"; }
details.check summary:hover { background: var(--hover); border-radius: var(--radius); }
details.check > :not(summary) { margin: 0 14px 10px 38px; }

/* ---------- steps (chapter reader) ---------- */
.reader { display: grid; grid-template-columns: minmax(0, 900px) 250px; gap: 56px; align-items: start; }
.reader-body { min-width: 0; }
.steps-rail { display: flex; gap: 3px; margin: 4px 0 10px; }
.steps-rail .seg { flex: 1; height: 4px; border-radius: 4px; background: var(--border); transition: background 200ms; }
.steps-rail .seg.done { background: color-mix(in srgb, var(--accent) 45%, var(--border)); }
.steps-rail .seg.cur { background: var(--accent); }
.step-where { display: flex; align-items: center; gap: 12px; margin: 0 0 26px; font-weight: 600; color: var(--text); min-height: 34px; }
.step-where .muted { font-weight: 400; margin-right: 6px; font-variant-numeric: tabular-nums; }
.step-where-t { flex: 1; min-width: 0; }
.reader .step-toc-btn { display: none; flex: none; padding: 5px 10px; font-size: 0.85rem; }
.step-toc-btn .i { width: 16px; height: 16px; }

.outline { position: sticky; top: 76px; max-height: calc(100vh - 100px); overflow-y: auto; font-size: 0.9rem; border-left: 1px solid var(--border); padding: 2px 0 2px 14px; }
.outline-title { font-size: 0.75rem; font-weight: 600; color: var(--muted); margin: 0 0 8px 8px; }
.outline-list { list-style: none; padding: 0 !important; margin: 0; }
.outline-list li { margin: 0 !important; max-width: none; }
.outline-group { font-size: 0.75rem; font-weight: 600; color: var(--muted); padding: 14px 8px 4px; }
.outline-item button {
  display: flex; gap: 10px; width: 100%; text-align: left; font: inherit; color: var(--text-2);
  background: none; border: 0; border-radius: 6px; padding: 5px 8px; cursor: pointer; line-height: 1.35;
}
.outline-item button:hover { background: var(--hover); color: var(--text); }
.outline-item .n { flex: none; width: 1.6em; text-align: right; color: var(--muted); font-variant-numeric: tabular-nums; }
.outline-item.done .n { color: color-mix(in srgb, var(--accent) 70%, var(--muted)); }
.outline-item.cur button { background: var(--hover); color: var(--text); font-weight: 600; box-shadow: inset 2px 0 0 var(--accent); }
.outline-item.cur .n { color: var(--accent); }

@media (max-width: 1150px) {
  .reader { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .reader-body > .outline { position: static; display: none; max-height: none; border: 1px solid var(--border); border-radius: var(--radius); background: var(--raised); box-shadow: var(--shadow); padding: 10px 6px; margin: -12px 0 22px; }
  .reader-body > .outline.open { display: block; }
  .reader .step-toc-btn { display: inline-flex; align-items: center; gap: 6px; }
}
.step[hidden] { display: none; }
.step { animation: stepIn 260ms cubic-bezier(.16,1,.3,1); }
@keyframes stepIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .step { animation: none; } }
.step > h2:first-child { margin-top: 0; }
.step-nav {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  margin-top: 40px; padding-top: 18px; border-top: 1px solid var(--border); max-width: 900px;
}
.step-nav .spacer { flex: 1; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 9px 16px; border-radius: 8px; font-weight: 600; font-size: 0.95rem;
  border: 1px solid var(--border-strong); background: var(--bg); color: var(--text); cursor: pointer; text-decoration: none;
}
.btn:hover { background: var(--hover); text-decoration: none; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { background: color-mix(in srgb, var(--accent) 88%, #000); }
.btn .i { width: 16px; height: 16px; }
.step-count { font-size: 0.85rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.done-card { margin-top: 24px; padding: 16px 18px; border-radius: var(--radius); background: var(--ok-soft); max-width: 75ch; display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.done-card p { margin: 0; flex: 1; min-width: 220px; }
.pager { display: none; }

/* ---------- overview pages ---------- */
.overview-head { max-width: 75ch; margin-bottom: 26px; }
.continue {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap; padding: 18px 20px; border-radius: 10px;
  background: var(--raised); border: 1px solid var(--border); box-shadow: var(--shadow); max-width: 760px; margin: 0 0 34px;
}
.continue .what { flex: 1; min-width: 220px; }
.continue .what small { display: block; color: var(--muted); font-size: 0.82rem; }
.continue .what strong { font-size: 1.1rem; }
.levels { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; max-width: 1300px; }
.level-col h2 { margin: 0 0 4px; font-size: 1.15rem; display: flex; align-items: center; gap: 8px; }
.level-col .meta { font-size: 0.85rem; color: var(--muted); margin-bottom: 10px; font-variant-numeric: tabular-nums; }
.meter { height: 6px; border-radius: 6px; background: var(--border); overflow: hidden; display: flex; margin-bottom: 14px; }
.meter span { height: 100%; }
.meter .m3 { background: var(--ok); } .meter .m2 { background: var(--accent); } .meter .m1 { background: color-mix(in srgb, var(--accent) 45%, var(--border)); }
.topic-list { list-style: none; padding: 0 !important; margin: 0; }
.topic-list li { margin: 0 !important; max-width: none; }
.topic-list a {
  display: flex; align-items: center; gap: 10px; padding: 7px 8px; border-radius: 6px; color: var(--text); text-decoration: none; font-size: 0.95rem;
}
.topic-list a:hover { background: var(--hover); }
.topic-list .id { font-family: var(--mono); font-size: 0.75rem; color: var(--muted); width: 3.4em; flex: none; }
.topic-list .t { flex: 1; min-width: 0; }
.topic-list .t small { display: block; color: var(--muted); font-size: 0.8rem; }

/* legacy blocks still used by plan */
.card { border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 18px; margin: 12px 0; background: var(--raised); }
.timeline { list-style: none; padding: 0 !important; counter-reset: ph; }
.timeline li { position: relative; padding: 0 0 18px 42px; }
.timeline li::before {
  counter-increment: ph; content: counter(ph); position: absolute; left: 0; top: 0; width: 28px; height: 28px; border-radius: 50%;
  background: var(--border); color: var(--text-2); display: grid; place-items: center; font-weight: 700; font-size: 0.85rem;
}
.timeline li.now::before { background: var(--accent); color: var(--accent-ink); }

/* ---------- drawer (phones / small tablets) ---------- */
.scrim { display: none; }
@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; z-index: 50; left: 0; top: 0; bottom: 0; width: min(86vw, 320px); height: auto;
    transform: translateX(-102%); transition: transform 240ms cubic-bezier(.16,1,.3,1); box-shadow: var(--shadow);
  }
  body.drawer-open .sidebar { transform: none; }
  body.drawer-open .scrim { display: block; position: fixed; inset: 0; z-index: 40; background: rgba(0,0,0,0.35); }
  .menu-btn { display: inline-grid; }
  .topbar { padding: 8px 12px; }
  main { padding: 22px 16px 120px; }
  .levels { grid-template-columns: 1fr; }
  .status-pick .lbl { display: none; }
  .step-nav { position: sticky; bottom: 0; background: var(--bg); padding: 12px 0 calc(12px + env(safe-area-inset-bottom)); margin-top: 28px; }
  .step-nav .btn { padding: 10px 14px; }
}
@media (min-width: 901px) and (max-width: 1200px) { .levels { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* step buttons: long labels on wide screens, short on phones */
.btn .short { display: none; }
@media (max-width: 900px) {
  .btn .long { display: none; }
  .btn .short { display: inline; }
}

/* long German compounds must never push the page sideways on phones */
main p, main li, main summary, main td, main .box { overflow-wrap: break-word; }
@media (max-width: 900px) { main summary, main p { overflow-wrap: anywhere; } }

/* ---------- who is studying ---------- */
.person { position: relative; margin: 0 4px 10px; }
.person-btn {
  display: flex; align-items: center; gap: 8px; width: 100%; padding: 6px 8px; border-radius: 6px;
  border: 1px solid var(--border); background: var(--bg); cursor: pointer; font-size: 0.9rem; color: var(--text); text-align: left;
}
.person-btn span { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; }
.person-btn .i { width: 16px; height: 16px; color: var(--muted); }
.person-btn:hover { background: var(--hover); }
.person-menu { margin-top: 6px; padding: 6px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg); box-shadow: var(--shadow); }
.person-pick { display: grid; gap: 4px; }
.person-opt {
  display: flex; align-items: center; gap: 8px; width: 100%; padding: 7px 8px; border: 0; border-radius: 6px;
  background: none; cursor: pointer; text-align: left; font-size: 0.92rem; color: var(--text);
}
.person-opt span { flex: 1; }
.person-opt .i { width: 16px; height: 16px; color: var(--muted); }
.person-opt.on { background: var(--select); font-weight: 600; }
.person-opt.on .i:last-child { color: var(--ok); }
.person-opt:hover { background: var(--hover); }
.person-add { display: flex; gap: 6px; margin-top: 4px; }
.person-add input {
  flex: 1; min-width: 0; font: inherit; font-size: 0.9rem; padding: 6px 10px; border-radius: 6px;
  border: 1px solid var(--border-strong); background: var(--bg); color: var(--text);
}
.person-add .btn { padding: 6px 10px; font-size: 0.88rem; }
.person-add.error input { border-color: var(--die); }
.continue.who { align-items: flex-start; }
.continue.who .what span { display: block; margin-top: 2px; }
.continue.who .person-pick { flex: 1; min-width: 240px; max-width: 360px; }
.continue.who .person-opt { border: 1px solid var(--border); }
.person-pick { grid-template-columns: minmax(0, 1fr); }
.person-menu .person-add .btn span { display: none; }
.person-menu .person-add .btn { padding: 6px 8px; }

/* ---------- sign-in page ---------- */
body.auth-page { min-height: 100vh; display: grid; place-items: center; background: var(--side); padding: 24px 16px; }
.auth { width: 100%; max-width: 400px; }
.auth-brand { display: flex; align-items: center; gap: 8px; justify-content: center; font-weight: 650; margin-bottom: 18px; }
.auth-brand .mark, .side-brand .mark { width: 22px; height: 22px; border-radius: 6px; background: var(--accent); color: var(--accent-ink); display: grid; place-items: center; font-size: 12px; font-weight: 800; }
.auth-card { background: var(--bg); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow); padding: 26px 24px; display: grid; gap: 14px; }
.auth-card[hidden] { display: none; }
.auth-card h1 { font-size: 1.5rem; margin: 0; }
.auth-card p { margin: 0; }
.auth-card label, .add-person label { display: grid; gap: 5px; font-size: 0.88rem; font-weight: 600; color: var(--text-2); }
.auth-card input, .add-person input, .add-person select, .pr-pw input, .pw-form input {
  font: inherit; font-size: 1rem; font-weight: 400; padding: 9px 12px; border-radius: 8px;
  border: 1px solid var(--border-strong); background: var(--bg); color: var(--text); width: 100%; min-width: 0;
}
.auth-card .btn { justify-content: center; padding: 11px 16px; }
.auth-msg:empty, .pr-msg:empty, .pw-msg:empty { display: none; }
.auth-msg, .err { color: var(--die); font-size: 0.92rem; }
.ok { color: var(--ok); }
.warn-text { color: var(--warn); font-weight: 600; }

/* ---------- account menu ---------- */
.person-menu a.person-opt { text-decoration: none; }
.pw-form { display: grid; gap: 6px; padding: 4px 4px 8px; }
.pw-form[hidden] { display: none; }
.pw-form input { font-size: 0.9rem; padding: 6px 10px; }
.pw-form .btn { justify-content: center; padding: 6px 10px; font-size: 0.88rem; }
.pw-msg { margin: 0; }

/* ---------- manage people ---------- */
.people { display: grid; gap: 10px; max-width: 900px; }
.person-row {
  display: grid; grid-template-columns: 1fr auto; gap: 10px 16px; align-items: center;
  padding: 14px 16px; border: 1px solid var(--border); border-radius: 10px; background: var(--raised);
}
.pr-main { display: grid; gap: 2px; }
.pr-actions { display: flex; flex-wrap: wrap; gap: 6px; justify-content: flex-end; }
.pr-actions .btn { padding: 6px 12px; font-size: 0.88rem; font-weight: 500; }
.pr-actions .btn.danger { background: var(--die); border-color: var(--die); color: #fff; }
.pr-pw { grid-column: 1 / -1; display: flex; gap: 8px; max-width: 460px; }
.pr-pw[hidden] { display: none; }
.pr-msg { grid-column: 1 / -1; margin: 0; }
.add-person { max-width: 900px; margin-top: 34px; padding-top: 6px; }
.add-person h2 { margin: 0 0 12px; font-size: 1.15rem; }
.add-person .fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin-bottom: 12px; }
.add-person .pr-msg { margin-bottom: 10px; }
@media (max-width: 600px) {
  .person-row { grid-template-columns: 1fr; }
  .pr-actions { justify-content: flex-start; }
}

/* ---------- level label on a chapter (sidebar, overview) ---------- */
.lv { flex: none; font-size: 0.66rem; font-weight: 700; line-height: 1; padding: 3px 5px; border-radius: 4px; border: 1px solid currentColor; letter-spacing: 0.02em; }
.lv.A1 { color: var(--das); } .lv.A2 { color: var(--der); } .lv.B1 { color: var(--accent); }
.chap .lv { opacity: 0.85; }

/* ---------- grammar overview by topic ---------- */
.level-chips { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 0 0 26px; }
.chip { border: 1px solid var(--border-strong); background: var(--bg); color: var(--text-2); border-radius: 999px; padding: 5px 14px; font-size: 0.9rem; cursor: pointer; }
.chip:hover { background: var(--hover); color: var(--text); }
.chip.on { background: var(--text); color: var(--bg); border-color: var(--text); }
.chips-meta { margin-left: 8px; font-size: 0.85rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 30px 34px; max-width: 1400px; }
.topic-col h2 { margin: 0 0 2px; font-size: 1.1rem; }
.topic-col .meta { font-size: 0.82rem; color: var(--muted); margin-bottom: 8px; }
.topic-list .lv { margin-top: 1px; }

/* ---------- exercises ---------- */
.ex-best { margin: -6px 0 12px; }
.ex-set { max-width: 900px; }
.ex-intro { color: var(--text-2); margin: 0 0 14px; }
.ex-items { list-style: none; padding: 0 !important; margin: 0; counter-reset: ex; display: grid; gap: 14px; }
.ex-item {
  counter-increment: ex; position: relative; max-width: none !important; margin: 0 !important;
  padding: 14px 16px 14px 46px; border: 1px solid var(--border); border-radius: 10px; background: var(--raised);
}
.ex-item::before { content: counter(ex); position: absolute; left: 14px; top: 15px; width: 22px; height: 22px; border-radius: 50%; background: var(--select); color: var(--text-2); font-size: 0.78rem; font-weight: 700; display: grid; place-items: center; }
.ex-q { font-size: 1.05rem; line-height: 2; margin-bottom: 8px; }
.ex-hint { color: var(--muted); font-size: 0.88rem; margin-left: 8px; white-space: nowrap; }
.ex-gap {
  font: inherit; font-size: 1rem; padding: 2px 8px; margin: 0 4px; border: 0; border-bottom: 2px solid var(--border-strong);
  background: var(--bg); color: var(--text); border-radius: 4px 4px 0 0; min-width: 4ch; max-width: 100%;
}
.ex-gap:focus { outline: none; border-bottom-color: var(--accent); background: var(--accent-soft); }
.ex-fix {
  display: block; width: 100%; font: inherit; font-size: 1rem; padding: 8px 12px; margin: 0 0 8px;
  border: 1px solid var(--border-strong); border-radius: 8px; background: var(--bg); color: var(--text);
}
.ex-wrong-line { color: var(--text-2); }
.ex-gap.good, .ex-fix.good { border-color: var(--ok); background: var(--ok-soft); }
.ex-gap.bad, .ex-fix.bad { border-color: var(--die); background: color-mix(in srgb, var(--die) 10%, var(--bg)); }
.ex-check { padding: 6px 14px; font-size: 0.9rem; }
.ex-check:disabled { display: none; }
.ex-opts { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 4px; }
.ex-opt {
  font: inherit; font-size: 1rem; padding: 8px 16px; border-radius: 8px; border: 1px solid var(--border-strong);
  background: var(--bg); color: var(--text); cursor: pointer; min-width: 64px;
}
.ex-opt:hover:not(:disabled) { background: var(--hover); }
.ex-opt:disabled { cursor: default; opacity: 0.6; }
.ex-opt.good { border-color: var(--ok); background: var(--ok-soft); color: var(--ok); font-weight: 600; opacity: 1; }
.ex-opt.bad { border-color: var(--die); color: var(--die); opacity: 1; text-decoration: line-through; }
.ex-built {
  min-height: 46px; display: flex; flex-wrap: wrap; gap: 6px; align-items: center; padding: 6px 8px; margin-bottom: 8px;
  border: 1px dashed var(--border-strong); border-radius: 8px; background: var(--bg);
}
.ex-built.good { border-style: solid; border-color: var(--ok); background: var(--ok-soft); }
.ex-built.bad { border-style: solid; border-color: var(--die); }
.ex-placeholder { color: var(--muted); font-size: 0.9rem; padding-left: 4px; }
.ex-placeholder[hidden] { display: none; }
.ex-pool { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; min-height: 8px; }
.ex-chip {
  font: inherit; font-size: 0.98rem; padding: 6px 12px; border-radius: 8px; border: 1px solid var(--border-strong);
  background: var(--raised); color: var(--text); cursor: pointer; box-shadow: 0 1px 0 var(--border);
}
.ex-chip:hover { background: var(--hover); }
.ex-built .ex-chip { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.ex-fb { margin-top: 8px; font-size: 0.95rem; padding: 8px 12px; border-radius: 8px; }
.ex-fb[hidden] { display: none; }
.ex-fb.good { background: var(--ok-soft); }
.ex-fb.good strong { color: var(--ok); }
.ex-fb.bad { background: color-mix(in srgb, var(--die) 9%, var(--bg)); }
.ex-fb.bad strong:first-child { color: var(--die); }
.ex-why { color: var(--text-2); display: block; margin-top: 2px; }
.ex-bar { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 18px; }
.ex-score { font-weight: 600; color: var(--text-2); font-variant-numeric: tabular-nums; }
.ex-score.good { color: var(--ok); }
.ex-score.bad { color: var(--warn); }
@media (max-width: 900px) {
  .ex-item { padding: 12px 12px 12px 40px; }
  .ex-item::before { left: 10px; top: 13px; }
  .ex-hint { white-space: normal; display: inline-block; }
}
.ex-built[data-end]::after { content: attr(data-end); margin-left: auto; padding-right: 6px; font-weight: 700; font-size: 1.1rem; color: var(--muted); }

/* chapter introduction: the first step explains the idea before the compact rule box */
.intro { max-width: 75ch; font-size: 1.04rem; }
.intro > p:first-child { margin-top: 0; }
.intro + .box { margin-top: 28px; }

/* admin: feature switch for hints in another language */
.feature { border: 1px solid var(--border); border-radius: var(--radius); background: var(--raised); padding: 14px 18px; margin: 0 0 26px; max-width: 760px; }
.feature h2 { margin: 0 0 4px; font-size: 1.1rem; }
.feature p { margin: 0 0 10px; }
.switch { display: flex; align-items: center; gap: 12px; cursor: pointer; font-weight: 600; }
.switch input { position: absolute; opacity: 0; width: 0; height: 0; }
.switch .track { flex: none; width: 42px; height: 24px; border-radius: 999px; background: var(--border-strong); position: relative; transition: background 160ms; }
.switch .track::after { content: ""; position: absolute; top: 3px; left: 3px; width: 18px; height: 18px; border-radius: 50%; background: var(--bg); transition: transform 160ms; box-shadow: 0 1px 2px rgba(0,0,0,.3); }
.switch input:checked + .track { background: var(--accent); }
.switch input:checked + .track::after { transform: translateX(18px); }
.switch input:focus-visible + .track { outline: 2px solid var(--focus); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { .switch .track, .switch .track::after { transition: none; } }