/* Layout: 單欄學習卡，上方分頁（測驗 / 單字庫 / 錯題本），測驗卡置中，像一張被螢光筆畫過的單字卡 */
:root {
  --paper: #f6f7fb;
  --card: #ffffff;
  --ink: #1b2a52;
  --ink-soft: #5b6688;
  --line: #dde1ee;
  --marker: #ffe14d;
  --marker-ink: #3a3200;
  --blue: #2f4fd6;
  --good: #1f8a5b;
  --good-bg: #e3f5ec;
  --bad: #c2384a;
  --bad-bg: #fbe7ea;
  --f-display: "Bricolage Grotesque", "Noto Sans TC", system-ui, sans-serif;
  --f-body: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #12162a; --card: #1b2140; --ink: #e8ebf7; --ink-soft: #9aa3c4; --line: #2e3762;
    --marker: #f2d43a; --marker-ink: #231d00; --blue: #8ea4ff;
    --good: #5fd39d; --good-bg: #173a2c; --bad: #ff8a99; --bad-bg: #4a1f28; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #12162a; --card: #1b2140; --ink: #e8ebf7; --ink-soft: #9aa3c4; --line: #2e3762;
  --marker: #f2d43a; --marker-ink: #231d00; --blue: #8ea4ff;
  --good: #5fd39d; --good-bg: #173a2c; --bad: #ff8a99; --bad-bg: #4a1f28; color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  background: var(--paper); color: var(--ink); font-family: var(--f-body); font-size: 15px; line-height: 1.6;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
  padding-block: 24px 48px;
}
.wrap { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
header { display: flex; align-items: flex-end; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
h1 { font-family: var(--f-display); font-weight: 800; font-size: 30px; line-height: 1.1; margin: 0; letter-spacing: -0.01em; }
h1 mark { background: linear-gradient(transparent 55%, var(--marker) 55%); color: inherit; padding: 0 2px; }
.sub { color: var(--ink-soft); font-size: 13px; margin: 4px 0 0; }
.stats-mini { font-family: var(--f-mono); font-size: 12px; color: var(--ink-soft); display: flex; gap: 14px; font-variant-numeric: tabular-nums; }
.stats-mini b { color: var(--ink); font-weight: 600; }

nav { display: flex; gap: 4px; border-bottom: 1px solid var(--line); overflow-x: auto; }
nav button {
  font: 500 14px var(--f-body); color: var(--ink-soft); background: none; border: 0; padding: 10px 14px; cursor: pointer;
  border-bottom: 3px solid transparent; white-space: nowrap;
}
nav button[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--blue); font-weight: 700; }
nav .count { font-family: var(--f-mono); font-size: 11px; background: var(--line); border-radius: 10px; padding: 1px 7px; margin-left: 4px; }

.panel { display: flex; flex-direction: column; gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 22px; }
.label { font-size: 12px; letter-spacing: 0.06em; color: var(--ink-soft); font-weight: 500; }

/* Setup */
.setup { display: grid; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.seg { display: flex; flex-wrap: wrap; gap: 8px; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg label {
  border: 1.5px solid var(--line); border-radius: 10px; padding: 8px 14px; cursor: pointer; font-size: 14px; background: var(--card);
  display: flex; flex-direction: column; gap: 0; min-width: 0;
}
.seg label small { color: var(--ink-soft); font-size: 12px; }
.seg input:checked + label { border-color: var(--blue); box-shadow: inset 0 0 0 1px var(--blue); }
.seg input:focus-visible + label { outline: 2px solid var(--blue); outline-offset: 2px; }
.btn {
  font: 700 15px var(--f-body); border-radius: 10px; padding: 11px 20px; cursor: pointer; border: 1.5px solid var(--ink);
  background: var(--ink); color: var(--paper);
}
.btn:hover { filter: brightness(1.15); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--ink-soft); filter: none; }
.btn.small { font-size: 13px; padding: 6px 12px; }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn:focus-visible, nav button:focus-visible, .opt:focus-visible, .icon-btn:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.hint { font-size: 13px; color: var(--ink-soft); }

/* Quiz */
.progress { display: flex; align-items: center; gap: 12px; font-family: var(--f-mono); font-size: 12px; color: var(--ink-soft); font-variant-numeric: tabular-nums; }
.bar { flex: 1; height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--blue); width: 0; transition: width .3s; }
.q { text-align: center; padding: 34px 22px 26px; display: flex; flex-direction: column; align-items: center; gap: 6px; }
.q .pos { font-family: var(--f-mono); font-size: 12px; color: var(--ink-soft); }
.q .word { font-family: var(--f-display); font-weight: 700; font-size: clamp(32px, 8vw, 52px); line-height: 1.1; overflow-wrap: anywhere; text-wrap: balance; }
.q .word.zh { font-family: var(--f-body); font-size: clamp(26px, 6vw, 38px); }
.icon-btn { background: none; border: 1px solid var(--line); border-radius: 20px; padding: 4px 12px; color: var(--ink-soft); font-size: 13px; cursor: pointer; display: inline-flex; gap: 6px; align-items: center; }
.icon-btn:hover { color: var(--ink); border-color: var(--ink-soft); }
.opts { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
@media (max-width: 520px) { .opts { grid-template-columns: 1fr; } }
.opt {
  text-align: left; font: 500 16px var(--f-body); color: var(--ink); background: var(--card); border: 1.5px solid var(--line);
  border-radius: 12px; padding: 14px 16px; cursor: pointer; display: flex; gap: 12px; align-items: center; min-width: 0;
}
.opt.en { font-family: var(--f-display); font-size: 18px; }
.opt:hover:not(:disabled) { border-color: var(--ink-soft); }
.opt kbd { font-family: var(--f-mono); font-size: 11px; color: var(--ink-soft); border: 1px solid var(--line); border-radius: 5px; padding: 0 6px; flex: none; }
.opt span { min-width: 0; overflow-wrap: anywhere; }
.opt.right { border-color: var(--good); background: var(--good-bg); }
.opt.wrong { border-color: var(--bad); background: var(--bad-bg); }
.opt:disabled { cursor: default; }
.spell { display: flex; gap: 10px; }
.spell input {
  flex: 1; min-width: 0; font: 600 22px var(--f-mono); color: var(--ink); background: var(--card); border: 1.5px solid var(--line);
  border-radius: 12px; padding: 12px 14px; letter-spacing: 0.04em;
}
.spell input:focus { outline: none; border-color: var(--blue); }
.spell input.right { border-color: var(--good); background: var(--good-bg); }
.spell input.wrong { border-color: var(--bad); background: var(--bad-bg); }
.feedback { border-radius: 12px; padding: 12px 16px; font-size: 14px; display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.feedback.good { background: var(--good-bg); color: var(--good); }
.feedback.bad { background: var(--bad-bg); color: var(--bad); }
.feedback b { font-family: var(--f-display); font-size: 17px; }
.feedback .ans { color: var(--ink); }

/* Result */
.score { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.score .big { font-family: var(--f-display); font-weight: 800; font-size: 64px; line-height: 1; font-variant-numeric: tabular-nums; }
.score .big mark { background: linear-gradient(transparent 60%, var(--marker) 60%); color: inherit; }

/* Word lists */
.list { border: 1px solid var(--line); border-radius: 14px; background: var(--card); overflow: hidden; }
.item { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr) auto; gap: 12px; padding: 11px 16px; align-items: center; border-top: 1px solid var(--line); }
.item:first-child { border-top: 0; }
.item .en { font-family: var(--f-display); font-weight: 700; font-size: 16px; overflow-wrap: anywhere; }
.item .en small { font-family: var(--f-mono); font-weight: 400; font-size: 11px; color: var(--ink-soft); margin-left: 6px; }
.item .zh { color: var(--ink-soft); overflow-wrap: anywhere; }
.item .meta { display: flex; gap: 8px; align-items: center; font-family: var(--f-mono); font-size: 12px; font-variant-numeric: tabular-nums; }
.pill { border-radius: 10px; padding: 1px 8px; font-size: 11px; font-family: var(--f-mono); white-space: nowrap; }
.pill.bad { background: var(--bad-bg); color: var(--bad); }
.pill.good { background: var(--good-bg); color: var(--good); }
.pill.new { background: var(--line); color: var(--ink-soft); }
.x { background: none; border: 0; color: var(--ink-soft); cursor: pointer; font-size: 16px; padding: 2px 6px; border-radius: 6px; }
.x:hover { color: var(--bad); background: var(--bad-bg); }
@media (max-width: 520px) { .item { grid-template-columns: minmax(0, 1fr) auto; } .item .zh { grid-column: 1; grid-row: 2; } .item .meta { grid-row: 1 / span 2; grid-column: 2; } }
textarea, .add input {
  width: 100%; font: 14px var(--f-mono); color: var(--ink); background: var(--card); border: 1.5px solid var(--line); border-radius: 10px; padding: 10px 12px;
}
textarea { min-height: 120px; resize: vertical; }
textarea:focus, .add input:focus { outline: none; border-color: var(--blue); }
.add { display: grid; grid-template-columns: 1fr 1.3fr 80px auto; gap: 8px; }
@media (max-width: 520px) { .add { grid-template-columns: 1fr 1fr; } }
.search { width: 100%; font: 14px var(--f-body); color: var(--ink); background: var(--card); border: 1.5px solid var(--line); border-radius: 10px; padding: 9px 12px; }
.search:focus { outline: none; border-color: var(--blue); }
.empty { text-align: center; color: var(--ink-soft); padding: 32px 16px; }
.toast { position: fixed; left: 50%; bottom: calc(20px + env(safe-area-inset-bottom, 0px)); transform: translateX(-50%); background: var(--ink); color: var(--paper); padding: 9px 16px; border-radius: 10px; font-size: 14px; z-index: 10; }
details summary { cursor: pointer; font-weight: 500; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

/* ---- 共用基本樣式 ---- */
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; }
[hidden] { display: none !important; }
select.search { appearance: auto; }
code { font-family: var(--f-mono); font-size: 0.92em; }

/* ---- 後台 ---- */
.admin-top { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.admin-top a { color: var(--blue); }
.notice { border-radius: 12px; padding: 10px 14px; font-size: 14px; }
.notice.good { background: var(--good-bg); color: var(--good); }
.notice.bad { background: var(--bad-bg); color: var(--bad); }
.form-grid { display: grid; grid-template-columns: 1fr 1.3fr 90px 1fr auto; gap: 8px; align-items: end; }
@media (max-width: 620px) { .form-grid { grid-template-columns: 1fr 1fr; } }
.form-grid label, .stack label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--ink-soft); min-width: 0; }
.input {
  width: 100%; font: 14px var(--f-body); color: var(--ink); background: var(--card); border: 1.5px solid var(--line);
  border-radius: 10px; padding: 9px 12px;
}
.input:focus { outline: none; border-color: var(--blue); }
.stack { display: flex; flex-direction: column; gap: 12px; max-width: 360px; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; background: var(--card); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 9px 14px; border-top: 1px solid var(--line); vertical-align: middle; }
th { border-top: 0; font-size: 12px; color: var(--ink-soft); font-weight: 500; letter-spacing: .04em; white-space: nowrap; }
td.en { font-family: var(--f-display); font-weight: 700; }
td.actions { white-space: nowrap; text-align: right; }
td.actions form { display: inline; }
.link-btn { background: none; border: 0; color: var(--blue); cursor: pointer; font: inherit; padding: 2px 6px; text-decoration: underline; }
.link-btn.danger { color: var(--bad); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { border: 1px solid var(--line); border-radius: 16px; padding: 3px 12px; font-size: 13px; color: var(--ink-soft); text-decoration: none; background: var(--card); }
.chip.on { border-color: var(--blue); color: var(--ink); font-weight: 700; }

/* ---- 學測真題 ---- */
.q .word.stem { font-family: var(--f-body); font-weight: 500; font-size: clamp(18px, 3.2vw, 22px); line-height: 1.7; text-align: left; max-width: 62ch; }
.q .word.stem .blank { display: inline-block; min-width: 5em; border-bottom: 2.5px solid var(--blue); margin: 0 4px; }
.explain { display: flex; flex-direction: column; gap: 8px; padding: 16px 18px; margin-top: 10px; }
.explain p { margin: 0; }
.explain .sentence { font-size: 16px; line-height: 1.7; }
.meanings { list-style: none; margin: 4px 0 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 6px 16px; font-size: 14px; }
@media (max-width: 520px) { .meanings { grid-template-columns: 1fr; } }
.meanings li { min-width: 0; overflow-wrap: anywhere; color: var(--ink-soft); }
.meanings li b { color: var(--ink); font-family: var(--f-display); }
.meanings li.is-answer b { background: linear-gradient(transparent 60%, var(--marker) 60%); }

/* ---- 暱稱 ---- */
.who-box { display: flex; flex-direction: column; align-items: flex-end; gap: 4px; }
.who { display: flex; align-items: center; gap: 6px; font-size: 14px; }
.who .link-btn { font-size: 13px; padding: 0 4px; }
.sync { font-size: 12px; color: var(--ink-soft); min-height: 1em; }
.sync.bad { color: var(--bad); }
@media (max-width: 520px) { .who-box { align-items: flex-start; } }

/* ---- 記憶法 ---- */
.form-grid .memo-field { grid-column: 1 / -1; }
.memo { display: flex; gap: 8px; align-items: flex-start; background: var(--card); border: 1px dashed var(--marker); border-left: 4px solid var(--marker); border-radius: 10px; padding: 10px 14px; font-size: 14px; line-height: 1.6; color: var(--ink); }
.memo b { font-weight: 700; white-space: nowrap; }
.feedback + .memo { margin-top: 10px; }
.item .zh .memo-line { display: block; font-size: 13px; color: var(--ink-soft); margin-top: 2px; }