/* VocabLab — visual system. Light/dark via prefers-color-scheme. */
:root {
  --bg: #f4f4f1;
  --surface: #ffffff;
  --surface-2: #f1f1ed;
  --surface-3: #e8e8e2;
  --text: #17191c;
  --text-2: #4b4f55;
  --muted: #7a7f87;
  --line: #e4e4df;
  --line-2: #d4d4ce;
  --accent: #1f6f5f;
  --accent-hover: #185a4d;
  --accent-ink: #ffffff;
  --accent-soft: #e2f1ec;
  --warn: #a8690f;
  --warn-soft: #fbf0da;
  --bad: #c0392b;
  --bad-soft: #fbe5e2;
  --good: #1f7a46;
  --good-soft: #e0f3e7;
  --info-soft: #e7ecf4;
  --radius: 14px;
  --radius-s: 9px;
  --shadow: 0 1px 2px rgba(23,25,28,.04), 0 6px 20px rgba(23,25,28,.05);
  --shadow-lg: 0 2px 4px rgba(23,25,28,.05), 0 18px 48px rgba(23,25,28,.10);
  --font: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, system-ui, sans-serif;
  --nav-h: 60px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121416; --surface: #1b1e21; --surface-2: #23272b; --surface-3: #2c3136; --text: #ecebe6; --text-2: #c3c2bb; --muted: #8f949b;
    --line: #2c3035; --line-2: #3a3f45; --accent: #7cc7b0; --accent-hover: #93d4c0; --accent-ink: #0f2019; --accent-soft: #1f3b33;
    --warn: #e2b05f; --warn-soft: #3a2f1c; --bad: #f08c80; --bad-soft: #3e2422; --good: #8fd6a8; --good-soft: #1f3a2a; --info-soft: #262e3a;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 6px 20px rgba(0,0,0,.25); --shadow-lg: 0 2px 4px rgba(0,0,0,.35), 0 18px 48px rgba(0,0,0,.45);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
html, body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--font); font-size: 16px; line-height: 1.55; -webkit-font-smoothing: antialiased; }
h1, h2, h3 { font-weight: 650; letter-spacing: -.015em; margin: 0 0 .5rem; line-height: 1.25; }
h1 { font-size: 1.6rem; } h2 { font-size: 1.2rem; } h3 { font-size: 1rem; }
p { margin: .3rem 0; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { margin: .3rem 0; padding-left: 1.2rem; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .85em; background: var(--surface-2); padding: .1em .4em; border-radius: 5px; word-break: break-all; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.help { font-size: .85rem; color: var(--muted); margin: .4rem 0; line-height: 1.5; }
.req { color: var(--bad); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

/* ---------- top bar ---------- */
.topbar { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 1.25rem; height: var(--nav-h); padding: 0 1.25rem; background: var(--surface); border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; font-size: 1.1rem; letter-spacing: -.02em; white-space: nowrap; display: inline-flex; align-items: center; gap: .5rem; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand b { font-weight: 700; }
.brand img { width: 26px; height: 26px; border-radius: 7px; display: block; }
.brand span { color: var(--accent); }
.tabs { display: flex; gap: .15rem; flex: 1; }
.tabs a { padding: .45rem .85rem; border-radius: 999px; color: var(--text-2); font-weight: 500; font-size: .95rem; }
.tabs a:hover { background: var(--surface-2); text-decoration: none; }
.tabs a.active { background: var(--accent-soft); color: var(--accent); }
.topbar-actions { display: flex; gap: .5rem; }

/* ---------- buttons & inputs ---------- */
.btn { font: inherit; font-size: .9rem; font-weight: 500; padding: .55rem 1rem; border-radius: var(--radius-s); border: 1px solid var(--line-2); background: var(--surface); color: var(--text); cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; gap: .4rem; line-height: 1.2; transition: background .12s, border-color .12s, transform .05s; white-space: nowrap; }
.btn:hover { background: var(--surface-2); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--text-2); }
.btn.ghost:hover { background: var(--surface-2); }
.btn.small { padding: .35rem .7rem; font-size: .825rem; }
.btn.danger { color: var(--bad); }
.btn:disabled { opacity: .5; cursor: default; transform: none; }
input, textarea, select { font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--line-2); border-radius: var(--radius-s); padding: .55rem .75rem; width: 100%; transition: border-color .12s, box-shadow .12s; }
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
textarea { resize: vertical; min-height: 2.5rem; line-height: 1.6; }
select { appearance: none; -webkit-appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%); background-position: calc(100% - 16px) 50%, calc(100% - 11px) 50%; background-size: 5px 5px; background-repeat: no-repeat; padding-right: 2rem; }
label { display: block; font-size: .85rem; color: var(--text-2); font-weight: 500; }
label > input, label > textarea, label > select { margin-top: .3rem; color: var(--text); font-weight: 400; }
.form { display: flex; flex-direction: column; gap: .8rem; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; }
.actions { display: flex; gap: .5rem; justify-content: flex-end; flex-wrap: wrap; margin-top: .25rem; }
.actions.left { justify-content: flex-start; align-items: center; }
fieldset { border: 1px solid var(--line); border-radius: var(--radius); padding: .9rem 1rem; display: flex; flex-direction: column; gap: .7rem; min-width: 0; }
legend { font-weight: 600; padding: 0 .35rem; font-size: .95rem; }
dialog { border: none; border-radius: 18px; background: var(--surface); color: var(--text); padding: 1.4rem 1.5rem; width: min(640px, calc(100vw - 2rem)); max-height: calc(100vh - 2rem); overflow: auto; box-shadow: var(--shadow-lg); }
dialog::backdrop { background: rgba(10,12,14,.5); backdrop-filter: blur(2px); }

/* ---------- layout ---------- */
.banner { padding: .55rem 1.25rem; font-size: .875rem; background: var(--warn-soft); color: var(--text-2); border-bottom: 1px solid var(--line); }
.banner.sim { background: var(--info-soft); }
.view { max-width: 1120px; margin: 0 auto; padding: 1.5rem 1.25rem 4rem; }
.grid { display: grid; grid-template-columns: 1fr; gap: 1.1rem; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.15rem 1.25rem; box-shadow: var(--shadow); min-width: 0; }
.card + .card { margin-top: 1.1rem; }
.toolbar { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin-bottom: .8rem; }
.toolbar input[type=search] { flex: 1; min-width: 160px; }
.empty { text-align: center; color: var(--muted); padding: 2.5rem 1rem; line-height: 1.6; }
.empty b { display: block; color: var(--text); font-size: 1.05rem; margin-bottom: .3rem; }
.loading { color: var(--muted); padding: 1rem; display: flex; align-items: center; }
.spinner { display: inline-block; width: 15px; height: 15px; border: 2px solid var(--line-2); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; vertical-align: middle; margin-right: .5rem; flex: none; }
@keyframes spin { to { transform: rotate(360deg); } }
.err-box { background: var(--bad-soft); color: var(--bad); padding: .65rem .85rem; border-radius: var(--radius-s); margin: .5rem 0; font-size: .925rem; }
.toast { position: fixed; left: 50%; bottom: 1.5rem; transform: translateX(-50%); background: var(--text); color: var(--bg); padding: .65rem 1.1rem; border-radius: 12px; font-size: .9rem; box-shadow: var(--shadow-lg); z-index: 60; max-width: min(90vw, 560px); animation: rise .18s ease-out; }
.toast.err { background: var(--bad); color: #fff; }
@keyframes rise { from { opacity: 0; transform: translate(-50%, 8px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* ---------- chips & badges ---------- */
.chips { display: flex; flex-wrap: wrap; gap: .35rem; }
.chip { font-size: .78rem; padding: .18rem .6rem; border-radius: 999px; background: var(--surface-2); color: var(--text-2); border: 1px solid transparent; cursor: pointer; }
.chip.on { background: var(--accent-soft); color: var(--accent); border-color: color-mix(in srgb, var(--accent) 35%, transparent); cursor: default; }
.tag { font-size: .72rem; padding: .1rem .5rem; border-radius: 999px; background: var(--surface-2); color: var(--muted); white-space: nowrap; }
.badge { font-size: .68rem; font-weight: 650; padding: .18rem .5rem; border-radius: 6px; text-transform: uppercase; letter-spacing: .05em; white-space: nowrap; }
.badge.new { background: var(--info-soft); color: var(--text-2); }
.badge.learning { background: var(--accent-soft); color: var(--accent); }
.badge.used { background: var(--good-soft); color: var(--good); }
.badge.strong { background: var(--good); color: #fff; }
.badge.needs { background: var(--bad-soft); color: var(--bad); }
.badge.due { background: var(--warn-soft); color: var(--warn); }
.badge.sim { background: var(--info-soft); color: var(--text-2); }

/* ---------- lists ---------- */
.list { list-style: none; margin: 0; padding: 0; }
.list li { display: flex; align-items: center; gap: .7rem; padding: .7rem .6rem; border-top: 1px solid var(--line); cursor: pointer; border-radius: var(--radius-s); }
.list li:first-child { border-top: none; }
.list li:hover { background: var(--surface-2); }
.list li.sel { background: var(--accent-soft); }
.list .ph { font-weight: 600; flex: 1; min-width: 0; }
.list .sub { font-size: .8rem; color: var(--muted); font-weight: 400; display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ---------- notebook / dictionary ---------- */
.lookup { display: flex; gap: .6rem; margin-bottom: 1.1rem; }
.lookup input { font-size: 1.1rem; padding: .85rem 1.1rem; border-radius: 14px; box-shadow: var(--shadow); }
.lookup .btn { padding: .85rem 1.25rem; border-radius: 14px; font-size: 1rem; }
.nb-head { display: flex; justify-content: space-between; gap: .75rem; align-items: flex-start; }
.nb-back { display: none; }
.dict h2 { font-size: 1.7rem; letter-spacing: -.025em; margin: 0; }
.dict .pos { font-style: italic; color: var(--muted); margin-top: .1rem; }
.dict .def { font-size: 1.1rem; line-height: 1.55; margin: .5rem 0 .7rem; color: var(--text); }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: .3rem 1rem; font-size: .9rem; margin-top: .8rem; }
.kv dt { color: var(--muted); } .kv dd { margin: 0; min-width: 0; overflow-wrap: anywhere; }
.section { margin-top: 1.1rem; padding-top: .9rem; border-top: 1px solid var(--line); }
.section h3 { display: flex; justify-content: space-between; align-items: center; gap: .5rem; flex-wrap: wrap; }
.card-field { margin: .7rem 0; }
.card-field b { display: block; font-size: .72rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; margin-bottom: .15rem; }
.card-field summary { list-style: none; } .card-field summary::-webkit-details-marker { display: none; }
.card-field summary::before { content: "▸ "; } .card-field[open] summary::before { content: "▾ "; }
.examples { padding-left: 0; list-style: none; }
.examples li { margin: .4rem 0; padding: .5rem .8rem; background: var(--surface-2); border-radius: var(--radius-s); line-height: 1.5; }
.ex-meta { font-size: .72rem; color: var(--muted); margin-left: .4rem; white-space: nowrap; }
.ai-label { font-size: .75rem; color: var(--muted); font-style: italic; font-weight: 400; }
.orig { background: var(--surface-2); border-left: 3px solid var(--accent); padding: .6rem .9rem; border-radius: 0 var(--radius-s) var(--radius-s) 0; color: var(--text-2); }
.rev { padding: .55rem .8rem; border: 1px dashed var(--line-2); border-radius: var(--radius-s); margin: .4rem 0; font-size: .9rem; }

/* ---------- stats ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: .75rem; margin-bottom: 1.1rem; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: .8rem 1rem; }
.stat .n { font-size: 1.7rem; font-weight: 700; letter-spacing: -.03em; line-height: 1.1; font-variant-numeric: tabular-nums; }
.stat .l { font-size: .78rem; color: var(--muted); margin-top: .15rem; }
.bar { height: 8px; border-radius: 4px; background: var(--surface-2); overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--accent); }
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
td, th { text-align: left; padding: .4rem .45rem; border-top: 1px solid var(--line); }
th { color: var(--muted); font-weight: 500; font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; border-top: none; }

/* ---------- flashcards ---------- */
.fc-wrap { max-width: 680px; margin: 0 auto; }
.progress-line { height: 5px; border-radius: 3px; background: var(--surface-3); overflow: hidden; margin-bottom: .9rem; }
.progress-line i { display: block; height: 100%; background: var(--accent); transition: width .3s; }
.fc-meta { display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: .85rem; margin: 0 .25rem .6rem; gap: .5rem; }
.fc { background: var(--surface); border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow-lg); padding: 2.25rem 2rem; min-height: 340px; display: flex; flex-direction: column; justify-content: center; cursor: pointer; transition: transform .12s; }
.fc:hover { transform: translateY(-1px); }
.fc .front { text-align: center; font-size: 2.1rem; font-weight: 700; letter-spacing: -.025em; line-height: 1.2; overflow-wrap: anywhere; }
.fc .front .ctx { font-size: .95rem; font-weight: 400; color: var(--muted); margin-top: 1.1rem; line-height: 1.5; }
.fc .back { font-size: 1rem; cursor: default; }
.fc .back .phrase { font-size: 1.5rem; font-weight: 700; letter-spacing: -.02em; display: flex; align-items: baseline; gap: .5rem; flex-wrap: wrap; }
.fc .back .def { font-size: 1.1rem; line-height: 1.55; margin: .45rem 0 .8rem; }
.fc .back .ex { margin: .4rem 0; padding: .45rem .8rem; background: var(--surface-2); border-radius: var(--radius-s); color: var(--text-2); line-height: 1.5; }
.fc .back .ex em { color: var(--text); font-style: normal; font-weight: 600; }
.grades { display: grid; grid-template-columns: repeat(4, 1fr); gap: .55rem; margin-top: 1rem; }
.grades button { font: inherit; padding: .75rem .4rem; border-radius: 14px; border: 1px solid var(--line-2); background: var(--surface); color: var(--text); cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: .15rem; transition: background .12s, transform .05s; }
.grades button b { font-size: 1rem; } .grades button span { font-size: .75rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.grades button:hover { background: var(--surface-2); } .grades button:active { transform: translateY(1px); }
.grades .again b { color: var(--bad); } .grades .hard b { color: var(--warn); } .grades .good b { color: var(--accent); } .grades .easy b { color: var(--good); }
.flip-hint { text-align: center; color: var(--muted); font-size: .82rem; margin-top: 1rem; }

/* ---------- writing exercises ---------- */
.queue-group { margin-bottom: 1.1rem; }
.queue-group h3 { margin-bottom: .25rem; }
.qitem { display: flex; align-items: center; gap: .6rem; padding: .55rem .3rem; border-top: 1px solid var(--line); flex-wrap: wrap; }
.qitem:first-of-type { border-top: none; }
.qitem .ph { flex: 1 1 200px; font-weight: 600; }
.qitem select { width: auto; padding: .35rem 2rem .35rem .6rem; font-size: .85rem; }
.exercise .prompt { font-size: 1.08rem; line-height: 1.65; margin: .5rem 0 .8rem; }
.exercise .targets { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; margin-bottom: .8rem; }
.target { background: var(--accent-soft); color: var(--accent); font-weight: 600; padding: .3rem .75rem; border-radius: var(--radius-s); }
.target.hidden-target { background: var(--surface-2); color: var(--muted); font-weight: 500; letter-spacing: .15em; }
.hint-box { background: var(--warn-soft); border-radius: var(--radius-s); padding: .55rem .8rem; margin: .5rem 0; font-size: .925rem; }
.answer textarea { min-height: 7rem; font-size: 1rem; }
.wc { font-size: .8rem; color: var(--muted); text-align: right; margin-top: .2rem; }
.context-note { font-size: .85rem; color: var(--accent); font-weight: 500; }
.feedback .dims { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: .5rem; margin: .6rem 0 .8rem; }
.dim { border: 1px solid var(--line); border-radius: var(--radius-s); padding: .55rem .75rem; font-size: .875rem; }
.dim.ok { border-color: color-mix(in srgb, var(--good) 50%, transparent); } .dim.issue { border-color: color-mix(in srgb, var(--warn) 60%, transparent); }
.dim b { display: block; font-size: .72rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin-bottom: .1rem; }
.dim.ok b::before { content: "✓ "; color: var(--good); } .dim.issue b::before { content: "! "; color: var(--warn); }
.answer-text { white-space: pre-wrap; background: var(--surface-2); padding: .8rem 1rem; border-radius: var(--radius-s); line-height: 1.7; }
mark { background: var(--bad-soft); color: inherit; border-bottom: 2px solid var(--bad); padding: 0 .1em; border-radius: 2px; }
mark.style { background: var(--warn-soft); border-bottom-color: var(--warn); }
.issue { border-left: 3px solid var(--bad); padding: .45rem .8rem; margin: .5rem 0; background: var(--surface); border-radius: 0 var(--radius-s) var(--radius-s) 0; }
.issue.style { border-left-color: var(--warn); }
.issue .q { font-weight: 600; }
.issue .cat { font-size: .7rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin-left: .4rem; }
.reveal-box { background: var(--good-soft); padding: .55rem .8rem; border-radius: var(--radius-s); margin: .4rem 0; }
.outcome { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; padding: .65rem .9rem; border-radius: var(--radius-s); background: var(--surface-2); margin-top: .8rem; font-size: .925rem; }
.outcome.independent { background: var(--good-soft); } .outcome.incorrect { background: var(--bad-soft); } .outcome.assisted, .outcome.guided, .outcome.alternative { background: var(--warn-soft); }
.strengths li::marker { color: var(--good); }
.revisions { margin-top: .8rem; }
.rules { font-size: .85rem; color: var(--muted); margin-top: 1rem; }
.rules summary { cursor: pointer; }

/* ---------- articles ---------- */
.drop { border: 2px dashed var(--line-2); border-radius: var(--radius); padding: 1.6rem 1rem; text-align: center; color: var(--muted); cursor: pointer; transition: border-color .15s, background .15s; }
.drop.over, .drop:hover { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }
.drop b { display: block; color: var(--text); margin-bottom: .2rem; }
.drop img { max-width: 100%; max-height: 220px; border-radius: var(--radius-s); margin-top: .6rem; }
.item { display: grid; grid-template-columns: 1fr auto; gap: .5rem 1rem; align-items: start; padding: .7rem .3rem; border-top: 1px solid var(--line); }
.item:first-child { border-top: none; }
.item .ph { font-weight: 600; }
.item .sent { font-size: .875rem; color: var(--muted); line-height: 1.5; }
.item .sent em { color: var(--text); font-style: normal; background: var(--accent-soft); padding: 0 .15em; border-radius: 3px; }
.item .mean { font-size: .875rem; }
.item.known { opacity: .55; }
.item.saved .ph::after { content: " · in notebook"; font-weight: 400; font-size: .8rem; color: var(--good); }
.seg { display: inline-flex; border: 1px solid var(--line-2); border-radius: var(--radius-s); overflow: hidden; }
.seg button { font: inherit; font-size: .8rem; padding: .35rem .65rem; border: none; background: var(--surface); color: var(--muted); cursor: pointer; }
.seg button + button { border-left: 1px solid var(--line-2); }
.seg button.on-known { background: var(--surface-3); color: var(--text); }
.seg button.on-learn { background: var(--accent); color: var(--accent-ink); }
.q { padding: .9rem 0; border-top: 1px solid var(--line); }
.q:first-child { border-top: none; padding-top: 0; }
.q .qk { font-size: .7rem; text-transform: uppercase; letter-spacing: .06em; color: var(--accent); font-weight: 650; }
.q .qt { font-weight: 500; margin: .2rem 0 .55rem; line-height: 1.5; }
.q textarea { min-height: 5rem; }
.und { display: inline-block; font-size: .72rem; font-weight: 650; padding: .18rem .55rem; border-radius: 6px; text-transform: uppercase; letter-spacing: .04em; }
.und.strong { background: var(--good-soft); color: var(--good); } .und.partial { background: var(--warn-soft); color: var(--warn); } .und.weak { background: var(--bad-soft); color: var(--bad); }
.art-text { white-space: pre-wrap; font-size: .9rem; max-height: 260px; overflow: auto; background: var(--surface-2); padding: .75rem 1rem; border-radius: var(--radius-s); line-height: 1.6; }

/* ---------- responsive ---------- */
@media (min-width: 900px) {
  .grid.two { grid-template-columns: minmax(280px, 5fr) 7fr; align-items: start; }
  .grid.two > :first-child { position: sticky; top: calc(var(--nav-h) + 1rem); max-height: calc(100vh - var(--nav-h) - 2rem); overflow: auto; }
  .grid.cols3 { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 899px) {
  .view { padding: 1rem 1rem calc(var(--nav-h) + 2.5rem); }
  .nb-back { display: inline-flex; margin-bottom: .6rem; }
  .grid.two.has-sel > #nb-list { display: none; }
  .grid.two:not(.has-sel) > #nb-detail { display: none; }
}
@media (max-width: 640px) {
  html, body { font-size: 15px; }
  .topbar { gap: .6rem; padding: 0 .9rem; }
  .topbar .tabs { position: fixed; left: 0; right: 0; bottom: 0; height: var(--nav-h); margin: 0; padding: .4rem .6rem calc(.4rem + env(safe-area-inset-bottom)); background: var(--surface); border-top: 1px solid var(--line); box-shadow: 0 -4px 16px rgba(0,0,0,.06); display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: .3rem; z-index: 20; }
  .topbar .tabs a { text-align: center; padding: .55rem .2rem; font-size: .85rem; border-radius: 10px; }
  .brand { flex: 1; }
  .row { grid-template-columns: 1fr; }
  .lookup { gap: .4rem; }
  .lookup input { font-size: 1rem; padding: .75rem .9rem; }
  .lookup .btn { padding: .75rem .9rem; }
  .card { padding: 1rem; border-radius: 12px; }
  .dict h2 { font-size: 1.45rem; }
  .nb-head { flex-direction: column; }
  .nb-head .actions { justify-content: flex-start; }
  .kv { grid-template-columns: 1fr; gap: .1rem; } .kv dt { margin-top: .4rem; }
  .fc { padding: 1.6rem 1.25rem; min-height: 280px; border-radius: 18px; }
  .fc .front { font-size: 1.7rem; }
  .grades { gap: .4rem; } .grades button { padding: .65rem .25rem; border-radius: 12px; } .grades button b { font-size: .95rem; }
  .flip-hint { display: none; }
  .item { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: .5rem; }
  dialog { padding: 1.1rem 1.1rem; border-radius: 14px; }
  .toast { bottom: calc(var(--nav-h) + 1rem); }
}