/* =========================================================
   English Trainer — mobile-first (target 390–430px)
   ========================================================= */

:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f0f3f8;
  --text: #15202e;
  --muted: #5d6b7e;
  --line: #e1e6ee;
  --primary: #1d4ed8;
  --primary-soft: #e8efff;
  --on-primary: #ffffff;
  --pron: #6d28d9;
  --ok: #15803d;
  --ok-soft: #e3f6ea;
  --warn: #9a3412;
  --warn-soft: #fff4e8;
  --danger: #b91c1c;
  --mark: #fff1a8;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .05);
  --nav-h: 62px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e141d;
    --surface: #161e2a;
    --surface-2: #1d2735;
    --text: #e8edf4;
    --muted: #9aa8ba;
    --line: #2a3647;
    --primary: #7aa2ff;
    --primary-soft: #1f2d4a;
    --on-primary: #0e141d;
    --pron: #c4a8ff;
    --ok: #4ade80;
    --ok-soft: #173024;
    --warn: #fdba74;
    --warn-soft: #33241a;
    --danger: #f87171;
    --mark: #5c4d12;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0e141d;
  --surface: #161e2a;
  --surface-2: #1d2735;
  --text: #e8edf4;
  --muted: #9aa8ba;
  --line: #2a3647;
  --primary: #7aa2ff;
  --primary-soft: #1f2d4a;
  --on-primary: #0e141d;
  --pron: #c4a8ff;
  --ok: #4ade80;
  --ok-soft: #173024;
  --warn: #fdba74;
  --warn-soft: #33241a;
  --danger: #f87171;
  --mark: #5c4d12;
  color-scheme: dark;
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 1rem/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  padding-bottom: calc(var(--nav-h) + env(safe-area-inset-bottom) + 12px);
}
a { color: var(--primary); text-decoration: none; }
button, input, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .5; }
mark { background: var(--mark); color: inherit; border-radius: 3px; padding: 0 2px; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
h1, h2, h3 { line-height: 1.25; margin: 0; }
hr { border: 0; border-top: 1px solid var(--line); margin: 14px 0; }

.muted { color: var(--muted); }
.small { font-size: .85rem; }
.center { text-align: center; }
.eyebrow { font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--primary); }

/* ---------- Layout ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; padding-top: max(10px, env(safe-area-inset-top));
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); }
.brand-badge {
  width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
  background: var(--primary); color: var(--on-primary); font-weight: 800; font-size: .85rem;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text small { color: var(--muted); font-size: .72rem; }
.icon-btn {
  width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  background: var(--surface-2); border: 1px solid var(--line); font-size: 1.05rem;
}

.shell { max-width: 720px; margin: 0 auto; padding: 14px 16px 24px; outline: none; }

.bottom-nav {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 30;
  display: grid; grid-template-columns: repeat(4, 1fr);
  height: calc(var(--nav-h) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--surface); border-top: 1px solid var(--line);
}
.bottom-nav a {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  color: var(--muted); font-size: .72rem; font-weight: 600;
}
.bottom-nav a span { font-size: 1.2rem; line-height: 1; }
.bottom-nav a.is-active { color: var(--primary); }

.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 14px; margin-bottom: 12px;
}
.card > p:first-child { margin-top: 0; }
.card-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 14px; }
.card-list > .card { margin-bottom: 0; }
.empty { text-align: center; color: var(--muted); padding: 28px 16px; }
.section-title { font-size: 1.05rem; margin: 22px 2px 10px; }
.section-title small { color: var(--muted); font-weight: 500; font-size: .8rem; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 44px; padding: 10px 14px; border-radius: 12px;
  background: var(--surface-2); color: var(--text); border: 1px solid var(--line);
  font-weight: 600; text-align: center;
}
.btn-primary { background: var(--primary); color: var(--on-primary); border-color: var(--primary); }
.btn-danger { color: var(--danger); }
.btn-block { display: flex; width: 100%; margin-top: 12px; }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.btn-row > .btn { flex: 1 1 0; }
.btn-row.big .btn { min-height: 52px; font-size: 1.05rem; }

.chip-btn {
  min-height: 36px; padding: 6px 10px; border-radius: 999px;
  background: var(--surface-2); border: 1px solid var(--line); font-size: .85rem; font-weight: 600;
  white-space: nowrap;
}
.chip-btn.is-on, .chip-btn[aria-pressed="true"] { background: var(--primary-soft); border-color: var(--primary); color: var(--primary); }
.mini-btn {
  width: 32px; height: 32px; flex: none; border-radius: 50%;
  background: var(--surface-2); border: 1px solid var(--line); font-size: .85rem;
}
.link-btn { background: none; border: 0; color: var(--primary); font-weight: 600; font-size: .85rem; padding: 6px 0; }
.link-muted { color: var(--muted); font-size: .8rem; }

.badge {
  display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: .72rem; font-weight: 700;
  background: var(--primary-soft); color: var(--primary); white-space: nowrap;
}
.badge-ok { background: var(--ok-soft); color: var(--ok); }
.badge-muted { background: var(--surface-2); color: var(--muted); }

.bar { height: 6px; border-radius: 999px; background: var(--surface-2); overflow: hidden; margin: 8px 0; }
.bar span { display: block; height: 100%; background: var(--primary); border-radius: inherit; transition: width .3s; }

.segmented { display: flex; gap: 4px; padding: 4px; margin: 8px 0; border-radius: 12px; background: var(--surface-2); }
.segmented button { flex: 1; min-height: 38px; border: 0; border-radius: 9px; background: transparent; font-weight: 600; }
.segmented button.is-on { background: var(--surface); color: var(--primary); box-shadow: var(--shadow); }

.tip { background: var(--primary-soft); border-color: transparent; font-size: .92rem; }
.notice { background: var(--warn-soft); color: var(--warn); border-radius: var(--radius-sm); padding: 10px 12px; font-size: .88rem; margin-bottom: 10px; }
.warn { color: var(--warn); font-weight: 600; margin-top: 6px; }
.pron-help { margin-top: 8px; }
.pron-help summary { cursor: pointer; font-weight: 600; color: var(--primary); font-size: .88rem; }
.pron-help p { margin: 6px 0; }
.pron-help table { width: 100%; border-collapse: collapse; font-size: .85rem; }
.pron-help td { padding: 4px 6px; border-top: 1px solid var(--line); vertical-align: top; }
.pron-help td:first-child { white-space: nowrap; width: 1%; }
.flow { margin: 6px 0 0; padding-left: 20px; }
.flow li { margin: 2px 0; }

.toast {
  position: fixed; left: 50%; bottom: calc(var(--nav-h) + 16px + env(safe-area-inset-bottom));
  transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 999px;
  font-weight: 600; font-size: .9rem; transition: .2s; z-index: 50; max-width: calc(100% - 32px); text-align: center;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- Page head ---------- */
.page-head { display: flex; align-items: flex-start; gap: 10px; margin: 2px 0 14px; }
.back-btn {
  width: 40px; height: 40px; flex: none; border-radius: 12px; display: grid; place-items: center;
  background: var(--surface); border: 1px solid var(--line); color: var(--text); font-size: 1.1rem;
}
.page-head h1 { font-size: 1.25rem; }
.page-head p { margin: 2px 0 0; color: var(--muted); font-size: .88rem; }

/* ---------- Dashboard ---------- */
.hero-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.hero h1 { font-size: 1.9rem; margin-top: 4px; }
.hero h1 small { font-size: 1rem; color: var(--muted); font-weight: 500; }
.hero p { margin: 0; }
.streak { text-align: center; background: var(--warn-soft); color: var(--warn); border-radius: 14px; padding: 8px 12px; }
.streak b { display: block; font-size: 1.2rem; }
.streak span { font-size: .72rem; font-weight: 600; }
.today-note { font-size: .82rem; color: var(--ok); margin-top: 8px !important; }

.continue h2 { font-size: 1.15rem; margin: 4px 0; }
.continue p { margin: 4px 0 8px; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 12px 0; }
.stat {
  display: flex; flex-direction: column; gap: 1px; padding: 8px 10px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px; color: var(--text);
}
.stat b { font-size: 1.1rem; line-height: 1.2; }
.stat span { font-size: .7rem; color: var(--muted); line-height: 1.2; }

.checklist { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.check { font-size: .78rem; padding: 3px 8px; border-radius: 999px; background: var(--surface-2); color: var(--muted); }
.check.done { background: var(--ok-soft); color: var(--ok); font-weight: 600; }

.phase { padding: 0; overflow: hidden; }
.phase summary { list-style: none; padding: 14px; cursor: pointer; display: flex; flex-direction: column; gap: 2px; }
.phase summary::-webkit-details-marker { display: none; }
.phase-title { font-weight: 700; }
.phase-sub { font-size: .82rem; color: var(--muted); }
.day-list { border-top: 1px solid var(--line); }
.day-row {
  display: grid; grid-template-columns: 34px 1fr auto; gap: 8px; align-items: center;
  padding: 10px 14px; border-bottom: 1px solid var(--line); color: var(--text); font-size: .92rem;
}
.day-row:last-child { border-bottom: 0; }
.day-row.is-current { background: var(--primary-soft); font-weight: 600; }
.day-row.is-locked { color: var(--muted); }
.day-no { font-weight: 700; color: var(--muted); font-size: .82rem; }

/* ---------- Day overview ---------- */
.complete-banner {
  margin-top: 10px; padding: 12px; border-radius: 12px; text-align: center;
  background: var(--ok-soft); color: var(--ok); font-weight: 800; letter-spacing: .03em;
}
.mode-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.mode-tab {
  display: flex; flex-direction: column; padding: 12px; border-radius: 14px;
  background: var(--surface); border: 1px solid var(--line); color: var(--text);
}
.mode-tab span { font-size: .8rem; color: var(--muted); }

.step-list { display: flex; flex-direction: column; gap: 8px; }
.step {
  display: grid; grid-template-columns: 38px 1fr auto; gap: 10px; align-items: center;
  padding: 12px; border-radius: 14px; background: var(--surface); border: 1px solid var(--line); color: var(--text);
}
.step.done { background: var(--ok-soft); border-color: transparent; }
.step.is-next { border-color: var(--primary); box-shadow: 0 0 0 1px var(--primary) inset; }
.step-icon { font-size: 1.35rem; text-align: center; }
.step-text { display: flex; flex-direction: column; font-size: .95rem; }
.step-text small { color: var(--muted); font-size: .8rem; }
.step-go { color: var(--primary); font-weight: 700; font-size: .85rem; }
.req { font-size: .66rem; font-weight: 700; text-transform: uppercase; color: var(--primary); }
.review-type { grid-template-columns: 1fr; gap: 0; padding: 0; }
.review-main { display: grid; grid-template-columns: 38px 1fr auto; gap: 10px; align-items: center; padding: 12px; color: var(--text); }
.review-type .link-btn { justify-self: start; padding: 0 12px 10px 60px; }

.runner-head { display: flex; gap: 6px; overflow-x: auto; padding-bottom: 8px; margin-bottom: 6px; scrollbar-width: none; }
.runner-step { flex: none; font-size: .75rem; padding: 4px 10px; border-radius: 999px; background: var(--surface-2); color: var(--muted); }
.runner-step.active { background: var(--primary); color: var(--on-primary); font-weight: 700; }
.runner-step.done { background: var(--ok-soft); color: var(--ok); }

/* ---------- Sentence card ---------- */
.s-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 12px 14px 4px; scroll-margin: 80px;
}
.s-card.is-focus { border-color: var(--primary); box-shadow: 0 0 0 2px var(--primary-soft); }
.s-top { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.s-num { font-weight: 800; color: var(--primary); font-size: .85rem; min-width: 14px; }
.s-id { font-size: .72rem; color: var(--muted); font-variant-numeric: tabular-nums; flex: 1; }
.s-en { font-size: 1.15rem; font-weight: 700; line-height: 1.35; }
.s-pron { color: var(--pron); font-size: .9rem; margin-top: 2px; }
.s-id-text { color: var(--muted); margin-top: 4px; }
.s-actions { display: flex; gap: 6px; overflow-x: auto; padding: 10px 0 8px; scrollbar-width: none; }
.s-actions::-webkit-scrollbar, .runner-head::-webkit-scrollbar { display: none; }

.hide-en .s-en, .hide-id .s-id-text { color: transparent; position: relative; user-select: none; }
.hide-en .s-en::after, .hide-id .s-id-text::after {
  content: attr(data-mask); position: absolute; inset: 0; display: flex; align-items: center;
  color: var(--muted); font-size: .82rem; font-weight: 500; font-style: italic;
  background: repeating-linear-gradient(-45deg, var(--surface-2) 0 8px, transparent 8px 16px); border-radius: 6px; padding-left: 6px;
}
.hide-en .s-pron { visibility: hidden; }

.s-more { border-top: 1px solid var(--line); margin: 0 -14px; padding: 0 14px; }
.s-more summary { padding: 10px 0; font-weight: 600; font-size: .88rem; color: var(--primary); cursor: pointer; }
.s-more[open] { padding-bottom: 10px; }
.word-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.word-list li { font-size: .9rem; padding: 4px 8px; border-radius: 8px; background: var(--surface-2); }
.word-list b { color: var(--primary); }
.phrase-box { margin-top: 8px; padding: 8px 10px; border-radius: 8px; background: var(--warn-soft); color: var(--warn); font-size: .88rem; }
.phrase-box strong { display: block; font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; }
.s-pattern-label { margin: 12px 0 4px; font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.s-foot { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-top: 10px; flex-wrap: wrap; }

/* ---------- Pattern ---------- */
.pattern { border-radius: 12px; background: var(--surface-2); padding: 10px 12px; }
.pattern-formula { font-weight: 700; font-size: 1.02rem; }
.slot { display: inline-block; padding: 0 6px; border-radius: 6px; background: var(--primary); color: var(--on-primary); font-size: .85em; }
.pattern-meaning { color: var(--muted); font-size: .88rem; margin: 2px 0 6px; }
.pattern-examples { list-style: none; padding: 0; margin: 0; display: grid; gap: 4px; }
.pattern-examples li { display: flex; align-items: center; gap: 8px; }
.pattern-note { font-size: .84rem; margin-top: 8px; color: var(--muted); }
.pattern-card .own-label { display: block; font-size: .82rem; color: var(--muted); margin: 10px 0 4px; }
.own-input, textarea, input[type="text"], input[type="search"] {
  width: 100%; border: 1px solid var(--line); border-radius: 12px; background: var(--bg);
  padding: 10px 12px; font-size: 1rem;
}

/* ---------- Drills (recall, listening, vocab) ---------- */
.drill-head { display: flex; justify-content: space-between; gap: 8px; font-size: .8rem; color: var(--muted); }
.drill-head .s-id { flex: none; }
.btn-row > .btn { white-space: nowrap; }
.prompt-label { font-size: .82rem; color: var(--muted); margin-top: 10px; }
.prompt-text { font-size: 1.3rem; font-weight: 700; line-height: 1.35; margin: 4px 0 8px; }
.prompt-text.en { color: var(--text); }
.hint summary { font-size: .85rem; color: var(--primary); cursor: pointer; }
.answer { margin-top: 12px; padding-top: 12px; border-top: 1px dashed var(--line); }
.answer-en { font-size: 1.2rem; font-weight: 700; }
.answer-id { color: var(--muted); margin-top: 4px; }
.reveal-en, .reveal-id { margin-top: 12px; }
.context { margin: 6px 0; font-size: .98rem; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.answer-input { margin-top: 8px; }
.check-result { font-weight: 700; margin-bottom: 6px; }
.check-result.ok { color: var(--ok); }
.check-result.bad { color: var(--danger); }
.vocab-answer { font-size: 1.1rem; }
.vocab-answer b { color: var(--primary); }
.other-senses { margin-top: 8px; padding: 8px 10px; border-radius: 8px; background: var(--surface-2); }

.rating { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin-top: 10px; }
.rate {
  display: flex; flex-direction: column; align-items: center; min-height: 54px; padding: 6px 2px;
  border-radius: 12px; border: 1px solid var(--line); background: var(--surface); font-weight: 700; font-size: .9rem;
}
.rate small { font-weight: 500; font-size: .7rem; color: var(--muted); }
.rate-again { color: var(--danger); }
.rate-hard { color: var(--warn); }
.rate-good { color: var(--primary); }
.rate-easy { color: var(--ok); }

.done-card { text-align: center; padding: 24px 16px; }
.done-emoji { font-size: 2.4rem; }
.done-card h2 { margin: 6px 0; }

/* ---------- Shadowing / speaking / timer ---------- */
.shadow-card { padding-bottom: 12px; }
.repeat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.repeat { min-height: 44px; border-radius: 12px; border: 1px dashed var(--line); background: var(--surface-2); font-weight: 600; }
.repeat.done { background: var(--ok-soft); color: var(--ok); border-style: solid; border-color: transparent; }

.speak-q { display: grid; grid-template-columns: auto 1fr auto; gap: 10px; align-items: start; }
.q-no { font-weight: 800; color: var(--primary); }
.q-en { font-weight: 700; font-size: 1.05rem; }
.q-id { font-size: .85rem; color: var(--muted); }
.q-id summary { cursor: pointer; }
.hint-line { margin: 10px 0 6px; font-size: .9rem; }
.example summary { color: var(--primary); font-weight: 600; cursor: pointer; font-size: .9rem; }
.example-text { margin: 6px 0 0; padding: 8px 10px; border-radius: 8px; background: var(--surface-2); }
.confirm { display: flex; align-items: center; gap: 8px; margin-top: 10px; font-size: .92rem; }
.confirm input { width: 20px; height: 20px; accent-color: var(--primary); }

.timer-card { text-align: center; }
.topic { font-size: 1.2rem; font-weight: 700; margin: 6px 0; }
.timer { font-size: 3rem; font-weight: 800; font-variant-numeric: tabular-nums; margin: 12px 0 4px; color: var(--muted); }
.timer.running { color: var(--primary); }
.q-timer { margin-top: 10px; }
.q-timer summary { color: var(--primary); font-weight: 600; cursor: pointer; font-size: .9rem; }
.timer-small { font-size: 2rem; text-align: center; margin: 6px 0 0; }

/* ---------- Vocab / search / settings ---------- */
.practice-grid { display: grid; grid-template-columns: 1fr; gap: 8px; margin-top: 8px; }
.vocab-row { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; margin-bottom: 6px; }
.vocab-row summary { display: flex; align-items: center; gap: 8px; padding: 10px 12px; cursor: pointer; }
.vocab-word { font-weight: 700; flex: 1; }
.vocab-detail { padding: 0 12px 12px; }
.sense { padding: 6px 0; border-top: 1px solid var(--line); font-size: .92rem; }
.sense-example { display: block; font-size: .85rem; }
.search-card { position: sticky; top: 64px; z-index: 5; }
.result-list { display: flex; flex-direction: column; gap: 8px; }
.result { display: block; color: var(--text); margin: 0; }
.result-en { font-weight: 700; }
.result-id { color: var(--muted); font-size: .92rem; }
.result-meta { font-size: .75rem; color: var(--primary); margin-top: 4px; }
.form { display: flex; flex-direction: column; gap: 6px; }
.form label { display: flex; flex-direction: column; margin-top: 8px; }
.form label small { color: var(--muted); font-weight: 400; font-size: .8rem; }
.toolbar-inline { display: flex; gap: 6px; margin-bottom: 10px; flex-wrap: wrap; }

/* ---------- Larger screens ---------- */
@media (min-width: 640px) {
  .stats { grid-template-columns: repeat(5, 1fr); }
  .practice-grid { grid-template-columns: 1fr 1fr; }
  .shell { padding-top: 20px; }
}