:root {
  --bg:#fafafa; --surface:#fff; --ink:#111113; --ink-2:#3f3f46; --mute:#8a8a93; --line:#ebebee;
  --hover:#f3f3f5; --accent:#2563eb; --ring:rgba(37,99,235,.18); color-scheme:light;
  --serif: ui-serif, "Iowan Old Style", "Charter", Georgia, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) { --bg:#0c0c0d; --surface:#141416; --ink:#f4f4f5; --ink-2:#c4c4cc; --mute:#77777f; --line:#232327;
    --hover:#1c1c1f; --accent:#7aa7ff; --ring:rgba(122,167,255,.22); color-scheme:dark; }
}
:root[data-theme="sepia"] { --bg:#f5eedc; --surface:#fbf6e9; --ink:#2b2418; --ink-2:#51463a; --mute:#948570; --line:#e5dac2;
  --hover:#eee3cb; --accent:#a15c07; --ring:rgba(161,92,7,.18); color-scheme:light; }
:root[data-theme="dark"] { --bg:#0c0c0d; --surface:#141416; --ink:#f4f4f5; --ink-2:#c4c4cc; --mute:#77777f; --line:#232327;
    --hover:#1c1c1f; --accent:#7aa7ff; --ring:rgba(122,167,255,.22); color-scheme:dark; }
* { box-sizing:border-box; }
html { -webkit-text-size-adjust:100%; }
body { margin:0; background:var(--bg); color:var(--ink); font:16px/1.6 var(--sans); -webkit-font-smoothing:antialiased; }
a { color:inherit; text-decoration:none; }
button { font:inherit; color:inherit; }
.wrap { max-width:680px; margin:0 auto; padding:0 20px; }

/* ---------- header / search ---------- */
header { position:sticky; top:0; z-index:5; background:color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter:saturate(1.4) blur(12px); -webkit-backdrop-filter:saturate(1.4) blur(12px);
  padding:14px 0; transition:padding .35s cubic-bezier(.2,.8,.2,1); }
body.home header { padding-top:26vh; background:transparent; backdrop-filter:none; -webkit-backdrop-filter:none; }
.bar { display:flex; align-items:center; gap:16px; }
.brand { font:600 17px/1 var(--serif); letter-spacing:-.01em; white-space:nowrap; }
.brand span { color:var(--mute); font-weight:400; }
body.home .bar { flex-direction:column; gap:22px; }
body.home .brand { font-size:34px; }
.search { position:relative; flex:1; width:100%; }
.field { display:flex; align-items:center; gap:10px; height:46px; padding:0 14px; border:1px solid var(--line);
  border-radius:14px; background:var(--surface); transition:border-color .15s, box-shadow .15s; }
.field:focus-within { border-color:var(--accent); box-shadow:0 0 0 4px var(--ring); }
body.home .field { height:54px; border-radius:16px; }
.field svg { flex:none; color:var(--mute); }
#q { flex:1; min-width:0; border:0; outline:0; background:transparent; font-size:17px; color:var(--ink); }
#q::placeholder { color:var(--mute); }
kbd { font:12px/1 var(--sans); color:var(--mute); border:1px solid var(--line); border-radius:6px; padding:3px 7px; }
.field:focus-within kbd { display:none; }
#suggest { position:absolute; left:0; right:0; top:calc(100% + 6px); margin:0; padding:6px; list-style:none;
  background:var(--surface); border:1px solid var(--line); border-radius:14px; display:none;
  box-shadow:0 12px 32px -12px rgba(0,0,0,.18); }
#suggest li { padding:8px 10px; border-radius:8px; cursor:pointer; color:var(--mute); }
#suggest li b { color:var(--ink); font-weight:500; }
#suggest li.on, #suggest li:hover { background:var(--hover); }

/* ---------- content ---------- */
main { padding:28px 0 64px; min-height:50vh; }
.headword { font:600 clamp(40px, 8vw, 56px)/1.05 var(--serif); letter-spacing:-.025em; margin:0 0 6px; word-break:break-word; }
.notice { color:var(--ink-2); padding:12px 16px; border-radius:12px; background:var(--hover); margin:8px 0 20px; font-size:15px; }
.notice a, .link { color:var(--accent); }

section.pos { padding:22px 0 8px; }
section.pos + section.pos { border-top:1px solid var(--line); margin-top:10px; }
.pos-head { display:flex; flex-wrap:wrap; align-items:baseline; gap:6px 12px; }
.pos-name { font:italic 17px var(--serif); color:var(--ink-2); }
.forms { font-size:14px; color:var(--mute); }
.forms b { color:var(--ink-2); font-weight:500; }

.pron { display:flex; flex-wrap:wrap; gap:8px; margin:14px 0 4px; }
.pill { display:inline-flex; align-items:center; height:36px; border:1px solid var(--line); border-radius:999px;
  background:var(--surface); overflow:hidden; }
.pill .say { display:inline-flex; align-items:center; gap:8px; height:100%; padding:0 12px 0 10px; border:0; background:none; cursor:pointer; }
.pill .say:hover, .pill .slow:hover { background:var(--hover); }
.pill .acc { font-size:11px; font-weight:600; letter-spacing:.06em; color:var(--mute); }
.pill .ipa { font-size:15px; font-family:"Lucida Sans Unicode","Arial Unicode MS","Segoe UI",var(--sans); color:var(--ink); }
.pill .slow { height:100%; padding:0 11px; border:0; border-left:1px solid var(--line); background:none;
  font-size:12px; color:var(--mute); cursor:pointer; }
.pill.playing { border-color:var(--accent); box-shadow:0 0 0 3px var(--ring); }
.pill.playing svg { color:var(--accent); }
.pill svg { color:var(--ink-2); }
.synth { width:5px; height:5px; border-radius:50%; background:var(--mute); opacity:.6; }

ol.senses { list-style:none; counter-reset:s; padding:0; margin:16px 0 0; }
ol.senses > li { counter-increment:s; position:relative; padding-left:30px; margin:0 0 16px; }
ol.senses > li::before { content:counter(s); position:absolute; left:0; top:1px; font-size:13px; color:var(--mute);
  font-variant-numeric:tabular-nums; }
.def { color:var(--ink); }
.label { display:inline-block; font-size:12px; color:var(--mute); margin-right:6px; }
.label + .label::before { content:"· "; }
.ex { margin:4px 0 0; color:var(--ink-2); font:italic 15.5px/1.55 var(--serif); opacity:.85; }
.w { cursor:pointer; border-radius:3px; transition:background .12s, color .12s; }
.w:hover { color:var(--ink); background:var(--hover); text-decoration:underline dotted var(--mute); text-underline-offset:3px; }

.related { display:flex; flex-wrap:wrap; gap:6px; align-items:center; margin:6px 0 6px 30px; }
.related .k { font-size:12px; color:var(--mute); margin-right:4px; }
.chip { font-size:14px; padding:3px 10px; border-radius:999px; background:var(--hover); color:var(--ink-2); transition:background .15s; }
.chip:hover { background:var(--line); color:var(--ink); }

details { margin:12px 0 0 30px; font-size:14.5px; color:var(--ink-2); }
summary { cursor:pointer; color:var(--mute); font-size:13px; list-style:none; display:inline-flex; align-items:center; gap:6px; }
summary::-webkit-details-marker { display:none; }
summary::before { content:"+"; font-size:14px; width:10px; }
details[open] summary::before { content:"–"; }
details p { margin:8px 0 0; line-height:1.65; }

.source { margin-top:28px; font-size:13px; color:var(--mute); }
.source a:hover { color:var(--ink); }

.empty { color:var(--mute); text-align:center; padding:24px 0; }
.suggest-list { display:flex; flex-wrap:wrap; gap:6px; justify-content:center; margin-top:14px; }
.wotd { text-align:center; margin-top:28px; color:var(--mute); font-size:14px; }
.wotd a { font:500 18px var(--serif); color:var(--ink); border-bottom:1px solid var(--line); margin-left:6px; }
.wotd a:hover { border-color:var(--ink); }
button.retry { margin-top:10px; height:34px; padding:0 14px; border-radius:10px; border:1px solid var(--line); background:var(--surface); cursor:pointer; }

.sk { height:14px; border-radius:6px; background:var(--line); margin:12px 0; animation:pulse 1.1s ease-in-out infinite alternate; }
@keyframes pulse { to { opacity:.45; } }

footer { color:var(--mute); font-size:12px; text-align:center; padding:0 20px 28px; }
footer a:hover { color:var(--ink); }
body.home footer { position:fixed; bottom:0; left:0; right:0; }

/* ---------- nav / buttons ---------- */
.nav { display:flex; gap:6px; flex:none; }
body.home .nav { position:fixed; top:16px; right:16px; }
.icon-btn { position:relative; flex:none; width:38px; height:38px; display:grid; place-items:center; border:1px solid var(--line);
  border-radius:12px; background:var(--surface); color:var(--ink-2); cursor:pointer; transition:background .15s, color .15s; padding:0; }
.icon-btn:hover { background:var(--hover); color:var(--ink); }
.icon-btn.on { color:var(--accent); border-color:color-mix(in srgb, var(--accent) 35%, var(--line)); }
.icon-btn.sm { width:30px; height:30px; border-radius:9px; }
.icon-btn.ghost { border-color:transparent; background:transparent; color:var(--mute); }
.icon-btn.ghost:hover { color:var(--ink); background:var(--hover); }
.badge { position:absolute; top:-5px; right:-5px; min-width:18px; height:18px; padding:0 5px; border-radius:9px;
  background:var(--accent); color:var(--surface); font-size:11px; font-weight:600; line-height:18px; text-align:center; }
.badge[hidden] { display:none; }
.btn { display:inline-flex; align-items:center; gap:8px; height:38px; padding:0 16px; border-radius:12px; border:1px solid var(--line);
  background:var(--surface); color:var(--ink); cursor:pointer; font-size:15px; }
.btn:hover { background:var(--hover); }
.btn.primary { background:var(--ink); color:var(--bg); border-color:var(--ink); }
.btn.primary:hover { opacity:.9; }
.btn.disabled { opacity:.45; pointer-events:none; }
.btn kbd { border-color:color-mix(in srgb, var(--bg) 35%, transparent); color:inherit; opacity:.7; }
.text-btn { border:0; background:none; padding:6px 8px; margin:0 -8px; color:var(--mute); cursor:pointer; font-size:14px; border-radius:8px; }
.text-btn:hover { color:var(--ink); }
.text-btn.danger:hover { color:#c0392b; }
.spacer { flex:1; }

/* ---------- entry head / save ---------- */
.head { display:flex; align-items:center; gap:12px; flex-wrap:wrap; }
.head .headword { margin:0; }
.level { font-size:12px; font-weight:600; letter-spacing:.03em; color:var(--mute); border:1px solid var(--line); border-radius:6px; padding:2px 7px; cursor:help; }
.level.sm { font-size:11px; padding:0 5px; margin-left:8px; }
.save-wrap { position:relative; }
.popover { position:absolute; right:0; top:calc(100% + 8px); z-index:4; width:240px; padding:10px; background:var(--surface);
  border:1px solid var(--line); border-radius:14px; box-shadow:0 12px 32px -12px rgba(0,0,0,.22); }
.pop-title { font-size:12px; color:var(--mute); padding:2px 6px 6px; }
.check { display:flex; align-items:center; gap:10px; padding:7px 6px; border-radius:8px; cursor:pointer; font-size:15px; }
.check:hover { background:var(--hover); }
.check input { accent-color:var(--accent); width:16px; height:16px; margin:0; }
.new-list { display:flex; gap:6px; margin:6px 0 4px; }
.new-list input { flex:1; min-width:0; height:30px; padding:0 10px; border:1px solid var(--line); border-radius:9px; background:var(--bg); color:var(--ink); font:inherit; font-size:14px; outline:0; }
.new-list input:focus { border-color:var(--accent); }
.popover .text-btn { margin:4px 0 0; width:100%; text-align:left; padding:7px 6px; }

/* ---------- practice ---------- */
.practice-btn { gap:6px; padding:0 12px; cursor:pointer; color:var(--ink-2); font-size:14px; }
.practice-btn:hover { background:var(--hover); }
.practice { margin:10px 0 0; padding:12px; border:1px dashed var(--line); border-radius:14px; }
.practice-row { display:flex; flex-wrap:wrap; align-items:center; gap:10px; }
.seg { display:inline-flex; border:1px solid var(--line); border-radius:10px; overflow:hidden; }
.seg button { border:0; background:none; padding:5px 10px; font-size:12px; font-weight:600; color:var(--mute); cursor:pointer; }
.seg button.on { background:var(--hover); color:var(--ink); }
.rec, .mine { display:inline-flex; align-items:center; gap:6px; height:32px; padding:0 12px; border-radius:999px; border:1px solid var(--line);
  background:var(--surface); cursor:pointer; font-size:14px; }
.rec.on { color:#c0392b; border-color:#c0392b; animation:pulse 1s ease-in-out infinite alternate; }
.practice-msg { color:var(--ink-2); font-size:14px; }
.good { color:#2e7d32; font-weight:600; }
.bad { color:#c0392b; font-weight:600; }
.hint { margin:8px 0 0; font-size:12px; color:var(--mute); }

/* ---------- translations ---------- */
.zh { margin:14px 0 0 30px; padding:10px 14px; border-left:2px solid var(--line); }
.zh .k { font-size:12px; color:var(--mute); margin-bottom:4px; }
.zh-row { padding:4px 0; }
.zh-gloss { font-size:12.5px; color:var(--mute); }
.zh-terms { display:flex; flex-wrap:wrap; align-items:baseline; gap:2px 6px; }
.zh-lang { font-size:11px; color:var(--mute); border:1px solid var(--line); border-radius:4px; padding:0 4px; }
.zh-term { font-size:17px; font-family:"PingFang HK","PingFang TC","Noto Sans TC","Microsoft JhengHei",sans-serif; }
.zh-tr { font-size:13px; color:var(--mute); }
.zh .sep { color:var(--mute); }
.zh .gap { width:10px; }
.zh details { margin:4px 0 0; }

/* ---------- machine translation ---------- */
.zh-toggle { font:600 15px "PingFang HK","PingFang TC","Noto Sans TC",sans-serif; }
.zh-toggle.on { background:var(--ink); color:var(--bg); border-color:var(--ink); }
.tr-note { font-size:12px; color:var(--mute); margin:6px 0 0; }
.tr-zh { font:15px/1.6 "PingFang HK","PingFang TC","Noto Sans TC","Microsoft JhengHei",sans-serif; color:var(--ink-2); margin-top:2px; }
.ex + .tr-zh { opacity:.85; }
.tr-zh.pending { height:14px; width:60%; border-radius:6px; background:var(--line); animation:pulse 1.1s ease-in-out infinite alternate; }
.card-back .tr-zh { margin:2px 0 8px; }

/* ---------- list pages ---------- */
.page-head { display:flex; align-items:center; gap:12px; margin-bottom:18px; }
.page-title { font:600 34px/1.1 var(--serif); letter-spacing:-.02em; margin:0; }
.tabs { display:flex; gap:6px; overflow-x:auto; padding-bottom:4px; margin-bottom:10px; scrollbar-width:none; }
.tab { flex:none; display:inline-flex; align-items:center; gap:6px; height:32px; padding:0 12px; border-radius:999px; font-size:14px;
  color:var(--ink-2); background:transparent; border:1px solid var(--line); cursor:pointer; }
.tab span { color:var(--mute); font-size:12px; }
.tab.on { background:var(--ink); color:var(--bg); border-color:var(--ink); }
.tab.on span { color:inherit; opacity:.7; }
.tab.add { padding:0 10px; }
.rows { list-style:none; margin:0; padding:0; }
.row { display:flex; align-items:center; gap:10px; padding:12px 0; border-bottom:1px solid var(--line); }
.row-main { flex:1; min-width:0; }
.row-word { font:600 18px var(--serif); }
.row-word:hover { color:var(--accent); }
.row-pos { font:italic 14px var(--serif); color:var(--mute); margin-left:8px; }
.row-def { font-size:14px; color:var(--mute); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.row-due { font-size:12px; color:var(--mute); flex:none; display:inline-flex; }
.group { font-size:12px; font-weight:600; letter-spacing:.06em; text-transform:uppercase; color:var(--mute); margin:22px 0 2px; }
.toolbar { display:flex; flex-wrap:wrap; gap:4px 20px; margin-top:22px; padding-left:8px; }

/* ---------- review ---------- */
.review-top { display:flex; justify-content:space-between; align-items:center; color:var(--mute); font-size:14px; margin-bottom:14px; }
.card { background:var(--surface); border:1px solid var(--line); border-radius:20px; padding:48px 28px; text-align:center; min-height:260px; }
.card-word { font:600 clamp(38px, 9vw, 52px)/1.1 var(--serif); letter-spacing:-.02em; word-break:break-word; }
.card-pron { display:flex; justify-content:center; gap:8px; margin-top:16px; flex-wrap:wrap; }
.pill-lite { display:inline-flex; align-items:center; gap:6px; height:32px; padding:0 12px; border-radius:999px; border:1px solid var(--line);
  background:transparent; font-size:12px; font-weight:600; color:var(--mute); cursor:pointer; }
.pill-lite .ipa { font-weight:400; font-size:14px; color:var(--ink); }
.pill-lite:hover { background:var(--hover); }
.card-back { margin-top:26px; padding-top:22px; border-top:1px solid var(--line); }
.card-def { font-size:18px; margin:6px 0; }
.card-zh { font-size:20px; margin:10px 0; font-family:"PingFang HK","PingFang TC","Noto Sans TC",sans-serif; }
.card-back .text-btn { margin-top:8px; display:inline-block; }
.reveal { display:flex; margin:20px auto 0; }
.grades { display:grid; grid-template-columns:repeat(4, 1fr); gap:8px; margin-top:20px; }
.grade { display:flex; flex-direction:column; align-items:center; gap:2px; padding:10px 4px; border-radius:14px; border:1px solid var(--line);
  background:var(--surface); cursor:pointer; font-size:15px; }
.grade:hover { background:var(--hover); }
.grade small { font-size:12px; color:var(--mute); }
.grade kbd { margin-top:4px; font-size:10px; padding:1px 5px; }
.grade.again span { color:#c0392b; } .grade.good span { color:#2e7d32; } .grade.easy span { color:var(--accent); }
.review-done { text-align:center; padding:48px 0; color:var(--ink-2); }
.review-done .big { font:600 34px var(--serif); color:var(--ink); margin-bottom:8px; }

.toast { position:fixed; left:50%; bottom:24px; transform:translate(-50%, 20px); opacity:0; background:var(--ink); color:var(--bg);
  padding:10px 16px; border-radius:12px; font-size:14px; transition:all .25s; z-index:10; }
.toast.show { opacity:1; transform:translate(-50%, 0); }

@media (max-width:560px) {
  .brand { display:none; }
  .nav .icon-btn { width:34px; height:34px; }
  .bar { gap:10px; }
  .grades { grid-template-columns:repeat(2, 1fr); }
  body.home .brand { display:block; }
  body.home header { padding-top:18vh; }
}
@media (prefers-reduced-motion: reduce) { * { transition:none !important; animation:none !important; } }