:root {
  --paper: #f5f7fa;
  --paper-line: rgba(27, 42, 74, 0.06);
  --card: #ffffff;
  --ink: #1b2a4a;
  --ink-soft: #5b6b8c;
  --ink-faint: #93a0b8;
  --border: #dce2ed;
  --border-soft: #e8ecf3;
  --red: #c0392b;
  --red-tint: #fbeae7;
  --green: #2e7d5b;
  --green-tint: #e6f4ee;
  --blue: #2f6fed;
  --blue-tint: #e8eefe;
  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --shadow: 0 10px 30px -14px rgba(27, 42, 74, 0.22);
  --shadow-sm: 0 2px 8px -2px rgba(27, 42, 74, 0.18);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --header-h: 64px;
  color-scheme: light;
}
[data-theme="dark"] {
  --paper: #121821;
  --paper-line: rgba(255, 255, 255, 0.04);
  --card: #1b2433;
  --ink: #e7eefc;
  --ink-soft: #b7c3da;
  --ink-faint: #8492ad;
  --border: #2d3a50;
  --border-soft: #263246;
  --red: #ff8d7d;
  --red-tint: #3a2424;
  --green: #7dcea8;
  --green-tint: #1a332b;
  --blue: #8eb0ff;
  --blue-tint: #1c2a48;
  --shadow: 0 10px 30px -14px rgba(0, 0, 0, 0.5);
  --shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.4);
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #121821;
    --paper-line: rgba(255, 255, 255, 0.04);
    --card: #1b2433;
    --ink: #e7eefc;
    --ink-soft: #b7c3da;
    --ink-faint: #8492ad;
    --border: #2d3a50;
    --border-soft: #263246;
    --red: #ff8d7d;
    --red-tint: #3a2424;
    --green: #7dcea8;
    --green-tint: #1a332b;
    --blue: #8eb0ff;
    --blue-tint: #1c2a48;
    --shadow: 0 10px 30px -14px rgba(0, 0, 0, 0.5);
    --shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.4);
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background-color: var(--paper);
  background-image: repeating-linear-gradient(to bottom, transparent 0 31px, var(--paper-line) 31px 32px);
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.6;
  min-height: 100vh;
}
img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--red); }
:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }
.skip {
  position: absolute; left: 12px; top: -40px; background: var(--card); padding: 8px 12px; z-index: 20;
}
.skip:focus { top: 8px; }
.top {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-soft);
}
.brand { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--ink); font-weight: 800; }
.brand-mark { color: var(--red); transform: rotate(-8deg); }
.nav { display: flex; gap: 8px; flex-wrap: wrap; }
.nav a, .icon-btn, .stamp-btn, .btn-ghost, .chip, .choice, .count-pill {
  border: 0; background: transparent; cursor: pointer; text-decoration: none;
}
.nav a {
  color: var(--ink-soft); font-weight: 700; font-size: 0.92rem;
  padding: 8px 10px; border-radius: 999px;
}
.nav a[aria-current="page"], .chip.active, .choice.active, .count-pill.active {
  background: var(--card); color: var(--red); box-shadow: var(--shadow-sm);
}
.top-actions { margin-left: auto; display: flex; gap: 8px; align-items: center; }
.icon-btn, .btn-ghost {
  border: 1px solid var(--border); background: var(--card); color: var(--ink-soft);
  border-radius: 999px; padding: 8px 12px; font-weight: 700;
}
.menu-btn { display: none; }
.wrap { max-width: 980px; margin: 0 auto; padding: 36px 20px 80px; }
.hero, .card, .content-card {
  background: var(--card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 28px;
}
.wrap > h2 { margin: 40px 0 16px; }
.hero h1, .page-title {
  font-size: clamp(1.7rem, 1.2rem + 1.6vw, 2.5rem);
  line-height: 1.2; letter-spacing: -0.02em; margin: 8px 0 10px;
}
.lede, .muted { color: var(--ink-soft); }
.accent { text-decoration: underline wavy var(--red); text-decoration-thickness: 2px; text-underline-offset: 6px; }
.grid { display: grid; gap: 20px; }
.grid-3, .grid-2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.map-card, .path-card {
  display: block; padding: 22px 24px; border-radius: var(--radius-md);
  border: 1px solid var(--border); background: var(--paper); color: inherit; text-decoration: none;
}
.map-card strong, .path-card strong { display: block; margin-bottom: 8px; font-size: 1.05rem; }
.map-card span, .path-card span, .meta { display: block; margin-top: 4px; color: var(--ink-soft); font-size: 0.95rem; line-height: 1.6; }
.kicker { font-family: var(--mono); font-size: 0.78rem; color: var(--ink-faint); letter-spacing: 0.04em; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.stack { display: flex; flex-direction: column; align-items: flex-start; gap: 18px; width: 100%; }
.stack > .field, .stack > .steps, .stack > .backup, .stack > .list, .stack > .grid { align-self: stretch; }
.stamp-btn, .btn-ghost { width: auto; max-width: 100%; }
.stamp-btn {
  background: var(--ink); color: var(--paper); border-radius: 999px; padding: 12px 20px; font-weight: 800;
}
.field, .search-input, textarea, select.field {
  width: 100%; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border); background: var(--paper);
}
select.field { width: 240px; max-width: 100%; }
.field-label { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; font-weight: 700; }
textarea { min-height: 120px; }
.chips { display: flex; gap: 12px; flex-wrap: wrap; }
.chip, .choice, .count-pill {
  border: 1px solid var(--border); background: var(--card); border-radius: 999px; padding: 10px 16px; font-weight: 700;
}
.choices { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.choice { width: 100%; text-align: left; border-radius: 12px; padding: 12px 14px; }
.word-card, .ledger-row, .mistake, .note, .quiz-card, .step {
  border: 1px solid var(--border-soft); border-radius: var(--radius-md); padding: 14px; background: var(--paper);
}
.word-en { font-size: 1.35rem; font-weight: 800; }
.ipa { font-family: var(--mono); color: var(--ink-soft); font-size: 0.92rem; }
.tag {
  display: inline-block; border-radius: 999px; padding: 2px 8px; font-size: 0.75rem; font-weight: 800;
  background: var(--blue-tint); color: var(--blue);
}
.tag.bad { background: var(--red-tint); color: var(--red); }
.tag.ok { background: var(--green-tint); color: var(--green); }
.audio-btn {
  width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--border); background: var(--card);
  display: inline-flex; align-items: center; justify-content: center; cursor: pointer; color: var(--ink-soft);
}
.audio-btn.playing { color: var(--red); border-color: var(--red); }
.listen-btn { border-radius: 999px; }
.recovery {
  display: inline-block; margin: 0; font-family: var(--mono); letter-spacing: 0.04em;
  background: var(--card); border: 1px dashed var(--border); border-radius: 12px; padding: 8px 12px;
}
audio.player { width: 100%; margin-top: 10px; }
.wrap > article + .grid,
.wrap > article + [data-widget] { margin-top: 36px; }
.q { font-size: 1.15rem; font-weight: 750; line-height: 1.5; margin: 12px 0 18px; }
.pager { display: flex; justify-content: space-between; gap: 8px; margin-top: 12px; }
.hidden { display: none !important; }
.lookup-pop {
  position: fixed; z-index: 30; max-width: 280px; padding: 10px 12px;
  background: var(--card); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow);
}
.site-footer { max-width: 980px; margin: 0 auto; padding: 0 18px 40px; color: var(--ink-faint); font-size: 0.85rem; }
.subnav { display: flex; gap: 10px; flex-wrap: wrap; margin: 0 0 24px; }
.subnav a { color: var(--ink-soft); font-weight: 700; text-decoration: none; padding: 6px 10px; border-radius: 999px; background: var(--card); }
.prose h2 { font-size: 1.25rem; margin: 22px 0 8px; }
.prose p { margin: 0 0 12px; }
.blank-input { font-weight: 800; font-size: 1.1rem; }
.ok-text { color: var(--green); font-weight: 800; }
.bad-text { color: var(--red); font-weight: 800; }
.score { font-size: 2rem; font-weight: 800; }
.conflict {
  border: 1px solid var(--red); background: var(--red-tint); padding: 12px; border-radius: 12px; margin-bottom: 12px;
}
@media (max-width: 800px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .menu-btn { display: inline-flex; }
  .nav { display: none; position: absolute; top: var(--header-h); left: 0; right: 0; flex-direction: column; padding: 8px; background: var(--card); border-bottom: 1px solid var(--border); }
  .nav.open { display: flex; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

.verb-lab { --lab-red: #C0392B; --lab-red-tint: #FBEAE7; }
.verb-lab .hero-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.verb-lab .hero-badge {
  font-family: var(--mono); font-size: 0.78rem; color: var(--ink-soft);
  background: var(--paper); border: 1px solid var(--border); padding: 5px 12px; border-radius: 999px;
}
.verb-lab .hero-title { margin-top: 18px; }
.verb-lab .hero-sub { color: var(--ink-soft); max-width: 52ch; margin: 0 0 18px; }
.verb-lab .hero-example {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  background: var(--paper); border: 1px dashed var(--border); border-radius: 14px; padding: 16px 18px;
}
.verb-lab .tabbar {
  display: flex; gap: 4px; width: fit-content; margin: 22px auto 18px;
  background: color-mix(in srgb, var(--ink) 6%, var(--paper)); padding: 4px; border-radius: 999px;
}
.verb-lab .tab-btn {
  border: 0; background: transparent; cursor: pointer; padding: 10px 26px; border-radius: 999px;
  font-weight: 700; color: var(--ink-soft);
}
.verb-lab .tab-btn.active { background: var(--card); color: var(--lab-red); box-shadow: var(--shadow-sm); }
.verb-lab .toolbar { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.verb-lab .search-input { flex: 1 1 220px; width: auto; border-radius: 999px; }
.verb-lab .view-toggle { display: flex; gap: 4px; background: var(--paper); border: 1px solid var(--border); border-radius: 999px; padding: 3px; }
.verb-lab .toggle-btn {
  border: 0; background: transparent; cursor: pointer; padding: 8px 16px; border-radius: 999px;
  font-size: 0.85rem; font-weight: 700; color: var(--ink-soft);
}
.verb-lab .toggle-btn.active { background: var(--ink); color: var(--paper); }
.verb-lab .chips { flex-wrap: wrap; }
.verb-lab .chip::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--chip-color, var(--ink-faint));
}
.verb-lab .chip.active { background: var(--chip-bg, var(--paper)); border-color: var(--chip-color, var(--border)); color: var(--chip-color, var(--ink)); }
.verb-lab .verb-rail { display: flex; align-items: flex-start; gap: 8px; flex-wrap: wrap; }
.verb-lab .rail-slot { min-width: 78px; }
.verb-lab .slot-word { font-weight: 800; font-size: 1.02rem; }
.verb-lab .slot-ipa { display: flex; align-items: center; gap: 5px; font-family: var(--mono); font-size: 0.78rem; color: var(--ink-soft); margin-top: 2px; }
.verb-lab .rail-arrow { color: var(--ink-faint); font-weight: 700; padding-top: 4px; }
.verb-lab .ledger { display: flex; flex-direction: column; }
.verb-lab .ledger-row {
  display: grid; grid-template-columns: 28px 1fr minmax(0, 180px) auto;
  grid-template-areas: "index rail meaning tag";
  align-items: center; column-gap: 14px; padding: 14px 4px; border-bottom: 1px solid var(--border-soft);
  background: transparent; border-radius: 0;
}
.verb-lab .row-index { grid-area: index; font-family: var(--mono); font-size: 0.75rem; color: var(--ink-faint); }
.verb-lab .row-meaning { grid-area: meaning; color: var(--ink-soft); }
.verb-lab .row-tag {
  grid-area: tag; font-size: 0.72rem; font-weight: 700; padding: 3px 10px; border-radius: 999px;
  border: 1px solid var(--tag-color); color: var(--tag-color); background: var(--tag-bg); white-space: nowrap;
}
.verb-lab .ledger-row .verb-rail { grid-area: rail; }
.verb-lab .flashcard-wrap { display: flex; flex-direction: column; align-items: center; gap: 16px; }
.verb-lab .flashcard { width: min(420px, 100%); height: 260px; perspective: 1400px; cursor: pointer; background: none; border: 0; padding: 0; }
.verb-lab .flashcard-inner { position: relative; width: 100%; height: 100%; transform-style: preserve-3d; transition: transform .55s cubic-bezier(.4,0,.2,1); }
.verb-lab .flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }
.verb-lab .flashcard-face {
  position: absolute; inset: 0; backface-visibility: hidden; border-radius: 14px; border: 1px solid var(--border);
  background: var(--paper); display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 22px;
}
.verb-lab .flashcard-back { transform: rotateY(180deg); background: var(--card); }
.verb-lab .fc-base { font-weight: 800; font-size: 2.2rem; margin: 8px 0 0; }
.verb-lab .fc-hint { color: var(--ink-faint); font-size: 0.8rem; margin-top: 18px; }
.count-pills { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin: 12px 0 18px; }
.count-pill {
  width: 52px; height: 52px; border-radius: 50%; border: 1px solid var(--border); background: var(--paper);
  font-weight: 800; cursor: pointer; color: var(--ink-soft);
}
.count-pill.active { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.session-setup { text-align: center; }
.session-setup .stamp-btn { margin-top: 8px; }
.verb-lab .count-pill {
  width: 52px; height: 52px; border-radius: 50%; border: 1px solid var(--border); background: var(--paper);
  font-weight: 800; cursor: pointer; color: var(--ink-soft);
}
.verb-lab .count-pill.active { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.verb-lab .blank { display: flex; flex-direction: column; gap: 4px; flex: 0 1 180px; }
.verb-lab .blank-label { font-size: 0.74rem; color: var(--ink-faint); font-weight: 700; }
.verb-lab .blank-input {
  width: 100%; border: 0; border-bottom: 2px solid var(--border); border-radius: 0; background: transparent;
  text-align: center; font-size: 1.15rem; font-weight: 800; padding: 6px 2px;
}
.verb-lab .blank-input:focus { outline: none; border-bottom-color: var(--lab-red); }
.verb-lab .qq-word { font-weight: 800; font-size: 2.4rem; margin: 8px 0; }
.verb-lab .quiz-progress { height: 6px; background: var(--border-soft); border-radius: 999px; overflow: hidden; width: 170px; }
.verb-lab .quiz-progress > span { display: block; height: 100%; background: var(--lab-red); }
.verb-lab .stamp-btn {
  border: 2px dashed var(--lab-red); background: var(--lab-red-tint); color: var(--lab-red);
  padding: 12px 22px; border-radius: 14px; font-weight: 800; transform: rotate(-1deg);
}
.verb-lab .score-ring { width: 140px; height: 140px; margin: 8px auto; }
@media (max-width: 700px) {
  .verb-lab .ledger-row {
    grid-template-columns: 1fr auto;
    grid-template-areas: "index tag" "rail rail" "meaning meaning";
    row-gap: 8px;
  }
}