:root {
  --bg: #f4efe6;
  --bg-deep: #efe6d6;
  --surface: #fffdf8;
  --elevated: #ffffff;
  --ink: #1c2a22;
  --ink-soft: #5a675f;
  --ink-faint: #8a948c;
  --line: #e4ddd0;
  --line-strong: #cfc5b3;
  --accent: #2e7d4f;
  --accent-deep: #1c5c38;
  --accent-soft: #e3f3e8;
  --gold: #c9862a;
  --gold-soft: #fbeccc;
  --heart: #e45c4c;
  --heart-soft: #fde8e5;
  --ok: #1d7a45;
  --ok-soft: #e3f6ea;
  --bad: #c13b32;
  --bad-soft: #fdecea;
  --shadow: 0 8px 24px rgba(40, 32, 18, 0.08);
  --radius: 18px;
  --radius-sm: 12px;
  --tap: 48px;
  --font: "Segoe UI", "Helvetica Neue", "Noto Sans", "Liberation Sans", system-ui, sans-serif;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.45;
  min-height: 100%;
}
button, input, textarea { font: inherit; }
button { color: inherit; }
img { max-width: 100%; }

.page {
  width: min(440px, 100%);
  margin: 0 auto;
  min-height: 100dvh;
  padding: calc(12px + var(--safe-top)) 16px calc(28px + var(--safe-bottom));
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  overflow: hidden;
  flex: 0 0 44px;
  box-shadow: var(--shadow);
}
.brand h1 {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.brand p {
  margin: 2px 0 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  margin-bottom: 14px;
}
.stat {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 12px 8px;
  text-align: center;
  box-shadow: var(--shadow);
}
.stat .value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-deep);
  line-height: 1.2;
}
.stat .label {
  font-size: 0.72rem;
  color: var(--ink-soft);
  margin-top: 2px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.xp-track {
  height: 8px;
  background: var(--bg-deep);
  border-radius: 99px;
  overflow: hidden;
  margin: 4px 0 14px;
}
.xp-track > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #4aa56b);
  border-radius: 99px;
}

.callout {
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  margin: 0 0 14px;
  border: 1px solid var(--line);
  background: var(--accent-soft);
  color: var(--ink);
}
.callout.warn { background: var(--gold-soft); border-color: #e6c781; }
.callout.ok { background: var(--ok-soft); border-color: #b8e0c4; }
.callout.bad { background: var(--bad-soft); border-color: #f3c4bf; }
.callout.info { background: #eef4fb; border-color: #c9d9ea; }
.callout strong { display: block; margin-bottom: 4px; }
.callout p { margin: 0; color: var(--ink-soft); }

.unit-title {
  text-align: center;
  font-weight: 700;
  margin: 18px 0 8px;
  color: var(--accent-deep);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

.path { display: flex; flex-direction: column; }
.path-row { display: flex; padding: 6px 4px 16px; }
.path-row.left { justify-content: flex-start; }
.path-row.right { justify-content: flex-end; }

.lesson-btn {
  width: 82%;
  max-width: 300px;
  min-height: 76px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 22px;
  border: 2px solid var(--line);
  background: var(--bg-deep);
  text-align: left;
  cursor: pointer;
  opacity: 0.55;
}
.lesson-btn.open { opacity: 1; background: var(--accent-soft); border-color: var(--accent); }
.lesson-btn.done { opacity: 1; background: var(--ok-soft); border-color: var(--ok); }
.lesson-btn:disabled { cursor: default; }
.lesson-emoji {
  width: 52px;
  height: 52px;
  flex: 0 0 52px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #d9d1c3;
  color: var(--ink-soft);
  font-size: 1.35rem;
  font-weight: 700;
}
.lesson-btn.open .lesson-emoji { background: var(--accent); color: #fff; }
.lesson-btn.done .lesson-emoji { background: var(--ok); color: #fff; }
.lesson-btn .title { font-weight: 700; }
.lesson-btn .meta, .lesson-btn .state {
  font-size: 0.8rem;
  color: var(--ink-soft);
}
.lesson-btn.open .state { color: var(--accent-deep); }

.stack { display: flex; flex-direction: column; gap: 10px; margin-top: 8px; }

.btn {
  min-height: var(--tap);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--line-strong);
  background: var(--elevated);
  cursor: pointer;
  font-weight: 650;
  width: 100%;
  word-break: break-word;
  white-space: normal;
}
.btn:disabled { opacity: 0.45; cursor: default; }
.btn.primary {
  background: var(--accent);
  border-color: var(--accent-deep);
  color: #fff;
}
.btn.primary:disabled { background: #8fb89a; border-color: #8fb89a; color: #f4fff7; opacity: 1; }
.btn.quiet { background: var(--surface); }
.btn.danger-ghost { color: var(--bad); }
.btn.icon {
  width: var(--tap);
  min-width: var(--tap);
  padding: 0;
  flex: 0 0 var(--tap);
  font-size: 1.2rem;
  line-height: 1;
}

.spoken {
  display: flex;
  gap: 6px;
  align-items: stretch;
  width: 100%;
}
.spoken .grow { flex: 1; min-width: 0; }
.speak-btns { display: inline-flex; gap: 6px; align-items: center; flex-shrink: 0; }

.tap {
  min-height: var(--tap);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--line-strong);
  background: var(--elevated);
  cursor: pointer;
  width: 100%;
  text-align: left;
  word-break: break-word;
  white-space: normal;
}
.tap.center { text-align: center; }
.tap:disabled { cursor: default; }
.tap.selected { background: var(--accent-soft); border-color: var(--accent); color: var(--accent-deep); font-weight: 650; }
.tap.ok { background: var(--ok-soft); border-color: var(--ok); color: var(--ok); }
.tap.bad { background: var(--bad-soft); border-color: var(--bad); color: var(--bad); }

.play-top {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 92%, white);
  backdrop-filter: blur(8px);
  margin: 0 -16px;
  padding: 8px 16px 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.play-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}
.hearts { display: flex; gap: 6px; font-size: 1.2rem; }
.hearts .off { opacity: 0.3; filter: grayscale(1); }
.xp-chip { color: var(--gold); font-weight: 700; font-size: 0.9rem; }
.lesson-chip { color: var(--ink-soft); font-size: 0.85rem; }
.progress { height: 10px; background: var(--bg-deep); border-radius: 99px; overflow: hidden; }
.progress > span { display: block; height: 100%; background: var(--accent); border-radius: 99px; }
.step { color: var(--ink-soft); font-size: 0.8rem; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow);
}
.prompt { font-size: 1.15rem; font-weight: 700; margin: 0; line-height: 1.3; }
.context {
  margin: 0;
  padding: 10px;
  background: var(--bg-deep);
  border-radius: 10px;
  color: var(--ink-soft);
  font-style: italic;
  word-break: break-word;
}
.blank-line { font-size: 1.1rem; }
.blank-line em {
  font-style: normal;
  color: var(--accent);
  font-weight: 700;
}

.bank-box {
  min-height: 56px;
  border-radius: 12px;
  border: 1.5px dashed var(--line-strong);
  padding: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.bank-box .hint { color: var(--ink-faint); font-size: 0.85rem; }
.tiles, .sort-row, .listen-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.tile { flex: 1 1 calc(50% - 8px); min-width: 120px; max-width: 100%; }
.bank-box .tile { flex: 1 1 auto; min-width: 72px; }
.match { display: flex; gap: 8px; align-items: flex-start; }
.match col, .match .col { flex: 1; display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.sort-item { display: flex; flex-direction: column; gap: 6px; }
.sort-item .word { font-weight: 700; }

.feedback {
  border-radius: var(--radius);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: 1px solid;
}
.feedback.ok { background: var(--ok-soft); border-color: var(--ok); }
.feedback.bad { background: var(--bad-soft); border-color: var(--bad); }
.feedback h2 { margin: 0; font-size: 1.15rem; }
.feedback.ok h2 { color: var(--ok); }
.feedback.bad h2 { color: var(--bad); }
.feedback .tip { color: var(--ink-soft); font-size: 0.95rem; }

.end { text-align: center; display: flex; flex-direction: column; gap: 14px; }
.end .boom { font-size: 3rem; line-height: 1.2; }
.end h2 { margin: 0; }
.end .sub { color: var(--ink-soft); }
.end-stats { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.end-stat {
  flex: 1 1 100px;
  background: var(--accent-soft);
  border-radius: var(--radius-sm);
  padding: 14px;
}
.end-stat.xp { background: var(--accent-soft); }
.end-stat.ok { background: var(--ok-soft); }
.end-stat .n { font-size: 1.6rem; font-weight: 800; color: var(--accent-deep); }
.end-stat.ok .n { color: var(--ok); }
.end-stat .l { font-size: 0.75rem; color: var(--ink-soft); text-transform: uppercase; letter-spacing: 0.04em; }

.grammar h2 { margin: 18px 0 6px; font-size: 1.15rem; }
.grammar .caption { color: var(--ink-soft); font-size: 0.9rem; margin: 0 0 8px; }
.table-wrap { overflow-x: auto; margin: 8px 0; -webkit-overflow-scrolling: touch; }
table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border-radius: 12px;
  overflow: hidden;
  font-size: 0.92rem;
}
th, td { padding: 10px 8px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--bg-deep); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-soft); }
.grammar .note { color: var(--ink-soft); margin: 8px 0 0; }

.toolbar { display: flex; flex-direction: column; gap: 10px; margin-top: 18px; }
.import-box textarea {
  width: 100%;
  min-height: 120px;
  border-radius: 12px;
  border: 1.5px solid var(--line-strong);
  padding: 10px;
  background: var(--elevated);
  resize: vertical;
}
.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
}

.level-up {
  background: var(--gold-soft);
  border: 1px solid #e6c781;
  border-radius: var(--radius-sm);
  padding: 12px;
  font-weight: 700;
}

.loading, .error-boot {
  padding: 32px 8px;
  text-align: center;
  color: var(--ink-soft);
}
.error-boot { color: var(--bad); }

@media (min-width: 500px) {
  body { background: radial-gradient(circle at top, #f8f3ea, #e8dfd0 70%); }
  .page { padding-top: calc(24px + var(--safe-top)); }
}