/* Mobile-first, tablet-kiosk friendly: large touch targets, high contrast,
   no hover-dependent affordances. */

:root {
  --bg: #14101c;
  --card: #1f1930;
  --card-2: #292040;
  --text: #efe9f7;
  --muted: #9d92b5;
  --accent: #d4a24e;      /* zar (gold) */
  --accent-2: #7bd4b0;
  --bad: #e07070;
  --ok: #7bd4b0;
  --warn: #e0b070;
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 17px;
  -webkit-tap-highlight-color: transparent;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: max(10px, env(safe-area-inset-top)) 16px 10px;
  background: linear-gradient(to bottom, #1a1423, rgba(26, 20, 35, 0.92));
  backdrop-filter: blur(6px);
}
.topbar h1 { font-size: 1.15rem; margin: 0; font-weight: 600; }
.topbar .latin { color: var(--muted); font-weight: 400; font-size: 0.8rem; margin-inline-start: 8px; }

.offline-badge {
  background: var(--warn);
  color: #201505;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 999px;
  padding: 3px 10px;
}

main {
  padding: 14px 14px 90px;
  max-width: 760px;
  margin: 0 auto;
}

.tabbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  background: #171225;
  border-top: 1px solid #302846;
  padding-bottom: env(safe-area-inset-bottom);
  z-index: 10;
}
.tabbar a {
  flex: 1;
  text-align: center;
  padding: 16px 4px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}
.tabbar a.active { color: var(--accent); }

.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 14px;
}
.card h2 { margin: 0 0 8px; font-size: 1.1rem; }
.card h3 { margin: 4px 0 8px; font-size: 1rem; }

.empty { color: var(--muted); text-align: center; padding: 48px 16px; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }

button {
  font: inherit;
  color: var(--text);
  background: var(--card-2);
  border: 1px solid #3a3055;
  border-radius: 10px;
  padding: 12px 18px;
  min-height: 48px;
  cursor: pointer;
}
button.primary { background: var(--accent); border-color: var(--accent); color: #241a08; font-weight: 700; }
button.big { width: 100%; font-size: 1.1rem; margin-top: 12px; }
button:disabled { opacity: 0.5; }
.tiny-btn { min-height: 34px; padding: 4px 10px; font-size: 0.8rem; }

.btn-row { display: flex; gap: 10px; margin-top: 10px; flex-wrap: wrap; }
.btn-row.tiny { margin-top: 6px; }

.lesson-select { display: block; margin: 12px 0; }
select {
  font: inherit;
  background: var(--card-2);
  color: var(--text);
  border: 1px solid #3a3055;
  border-radius: 10px;
  padding: 10px;
  max-width: 100%;
}

.session-header { display: flex; align-items: baseline; justify-content: space-between; margin: 4px 2px 12px; }
.session-header h2 { margin: 0; }

.block.current { outline: 2px solid var(--accent); }
.block.done { opacity: 0.75; }
.block-head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; flex-wrap: wrap; }

.chip {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 999px;
  padding: 3px 10px;
  background: var(--card-2);
  color: var(--muted);
}
.chip-standing { background: #2c3b57; color: #9fc2f0; }
.chip-lesson { background: #4a3b22; color: #ecc98a; }
.chip-review { background: #23433a; color: #8fdec0; }
.chip-flag { background: #542c33; color: #f0a0ab; }

.prompt { font-size: 1.15rem; line-height: 1.5; margin: 10px 0; }
.prompt.small { font-size: 0.95rem; }
.response { color: var(--accent-2); }

.answer {
  width: 100%;
  font: inherit;
  font-size: 1.1rem;
  background: var(--card-2);
  color: var(--text);
  border: 1px solid #3a3055;
  border-radius: 10px;
  padding: 12px;
  margin-top: 8px;
  min-height: 48px;
}
textarea.answer { min-height: 84px; resize: vertical; }

.verdict { font-weight: 600; }
.verdict.ok { color: var(--ok); }
.verdict.bad { color: var(--bad); }
.verdict.pending { color: var(--warn); }
.verdict.small { font-size: 0.9rem; }

.tutor-out {
  white-space: pre-wrap;
  background: var(--card-2);
  border-radius: 10px;
  margin-top: 10px;
  padding: 0 12px;
  line-height: 1.55;
}
.tutor-out:not(:empty) { padding: 12px; }

.revision-loop { border-top: 1px solid #3a3055; margin-top: 14px; padding-top: 10px; }

.big-number { font-size: 2.4rem; font-weight: 700; margin: 4px 0; }
.big-number.warn { color: var(--warn); }

.status-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; text-align: center; }
.status-cell { background: var(--card-2); border-radius: 10px; padding: 10px 4px; }
.status-cell.status-solid .big-number { color: var(--ok); }
.status-cell.status-shaky .big-number { color: var(--warn); }
.status-cell.status-emerging .big-number { color: #b0a0e0; }

.node-list { display: flex; flex-direction: column; gap: 10px; }
.node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--card-2);
  border-radius: 10px;
  padding: 10px 12px;
}
.node-row.flagged { border: 1px solid var(--bad); }
.node-info { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.spark { width: 120px; height: 28px; color: var(--accent); flex-shrink: 0; }
.node-row.status-solid .spark { color: var(--ok); }

.artifact { border-top: 1px solid #3a3055; padding-top: 10px; margin-top: 10px; }
.artifact:first-of-type { border-top: none; margin-top: 0; }
.revision-chain { margin: 6px 0; padding-inline-start: 22px; }
.revision-chain li { margin-bottom: 8px; }
.revision-chain li.accepted .rev-text { color: var(--ok); }
.revision-chain li.rejected .rev-text { color: var(--muted); text-decoration: line-through; }
.rev-text { font-size: 1.05rem; }

.error-box { margin-top: 10px; }
.error-list { color: var(--bad); font-size: 0.9rem; padding-inline-start: 20px; }

@media (min-width: 700px) {
  html, body { font-size: 18px; }
  .status-grid { gap: 14px; }
}