:root {
  --bg: #0b0d10;
  --bg-elev: #14181d;
  --bg-elev-2: #1b2026;
  --border: #262c34;
  --text: #e8ecf1;
  --text-dim: #a0a8b3;
  --accent: #ff6b2c;
  --accent-dim: #b94e1f;
  --good: #4ade80;
  --warn: #fbbf24;
  --danger: #ef4444;
  --radius: 10px;
  --tap: 48px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.45;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--accent); }

main {
  padding: 12px;
  padding-bottom: 120px;
  max-width: 720px;
  margin: 0 auto;
}

.app-header {
  padding: 14px 16px 10px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 5;
}

.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 14px; height: 14px; border-radius: 3px;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(255, 107, 44, 0.15);
}
.brand-name { font-weight: 700; letter-spacing: 0.02em; font-size: 1.1rem; }
.tagline { margin: 4px 0 0; color: var(--text-dim); font-size: 0.85rem; }

.tabs {
  position: sticky;
  top: 64px;
  z-index: 4;
  display: flex;
  gap: 4px;
  padding: 8px 8px 10px;
  overflow-x: auto;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }

.tab {
  flex: 0 0 auto;
  min-height: var(--tap);
  padding: 0 16px;
  background: var(--bg-elev);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}
.tab[aria-selected="true"] {
  background: var(--accent);
  color: #1a0a00;
  border-color: var(--accent);
}

.panel {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 14px;
}

h2 {
  margin: 0 0 12px;
  font-size: 1.2rem;
}
h3 {
  margin: 14px 0 8px;
  font-size: 0.95rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hint {
  margin: -4px 0 12px;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}
.field span em {
  color: var(--text-dim);
  font-style: normal;
  font-weight: 400;
}

input[type="text"], textarea {
  min-height: var(--tap);
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-elev-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
}
textarea { min-height: 96px; resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

input:focus, textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 0;
  border-color: var(--accent);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
}
@media (max-width: 480px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: var(--tap);
  margin-bottom: 10px;
}
.checkbox-row input { width: 22px; height: 22px; }

.symptoms {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  min-height: var(--tap);
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  user-select: none;
}
.chip input { width: 18px; height: 18px; }
.chip:has(input:checked) {
  border-color: var(--accent);
  background: rgba(255, 107, 44, 0.12);
}

button {
  font: inherit;
}
.btn-primary, .btn-secondary, .btn-danger {
  display: inline-block;
  width: 100%;
  min-height: var(--tap);
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 4px;
}
.btn-primary {
  background: var(--accent);
  color: #1a0a00;
}
.btn-primary:active { background: var(--accent-dim); }
.btn-secondary {
  background: var(--bg-elev-2);
  color: var(--text);
  border-color: var(--border);
}
.btn-danger {
  background: transparent;
  color: var(--danger);
  border-color: var(--danger);
}
.btn-danger:active { background: rgba(239, 68, 68, 0.1); }

.result {
  margin-top: 14px;
  padding: 12px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  min-height: 1px;
}
.result:empty { display: none; }

.result ul { padding-left: 18px; margin: 6px 0; }
.result li { margin: 4px 0; }
.result .good { color: var(--good); }
.result .warn { color: var(--warn); }
.result .row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 4px 0;
  border-bottom: 1px dashed var(--border);
  font-variant-numeric: tabular-nums;
}
.result .row:last-child { border-bottom: 0; }
.result h3 {
  margin-top: 0;
  color: var(--text);
  text-transform: none;
  letter-spacing: 0;
  font-size: 1rem;
}

.lap-table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.95rem;
}
.lap-table th, .lap-table td {
  text-align: right;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
}
.lap-table th:first-child, .lap-table td:first-child { text-align: left; }
.lap-table tr.best td { color: var(--good); font-weight: 700; }

.danger-zone, .save-zone {
  margin-top: 20px;
  padding: 14px;
  border-radius: 8px;
}
.save-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.save-actions > button {
  flex: 1 1 45%;
  margin-top: 0;
  width: auto;
}
.danger-zone {
  border: 1px dashed var(--danger);
  background: rgba(239, 68, 68, 0.05);
}
.save-zone {
  border: 1px solid var(--border);
  background: var(--bg-elev-2);
}
.danger-zone p, .save-zone p { margin: 0 0 10px; color: var(--text-dim); }

.history-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}
.history-actions > * {
  flex: 1 1 45%;
  margin-top: 0;
  width: auto;
}
.file-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--tap);
  padding: 12px 16px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 1rem;
  background: var(--bg-elev-2);
  color: var(--text);
  border: 1px solid var(--border);
  cursor: pointer;
  text-align: center;
}

#history-list { display: flex; flex-direction: column; gap: 10px; }
.session-card {
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
}
.session-card h4 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}
.session-card .meta {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 10px;
  font-variant-numeric: tabular-nums;
}
.session-card .actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.session-card .actions button {
  flex: 1 1 30%;
  min-height: 40px;
  padding: 8px 10px;
  margin-top: 0;
  font-size: 0.9rem;
}

.trend-block {
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 10px;
}
.trend-block h4 {
  margin: 0 0 8px;
  font-size: 1rem;
}
.trend-block .trend-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 10px;
  font-variant-numeric: tabular-nums;
  font-size: 0.9rem;
  padding: 4px 0;
  border-bottom: 1px dashed var(--border);
}
.trend-block .trend-row:last-child { border-bottom: 0; }
.trend-block .trend-row.pr { color: var(--good); font-weight: 700; }

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.compare-table th, .compare-table td {
  text-align: left;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.compare-table td.val { font-variant-numeric: tabular-nums; }
.compare-table tr.diff td { background: rgba(255, 107, 44, 0.08); }
.compare-table tr.diff td:first-child { border-left: 3px solid var(--accent); }

select {
  min-height: var(--tap);
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-elev-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
}
select:focus { outline: 2px solid var(--accent); border-color: var(--accent); }

.app-footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px;
  color: var(--text-dim);
  font-size: 0.85rem;
  text-align: center;
}
.app-footer p { margin: 4px 0; }

.panel.prose p,
.panel.prose li {
  color: var(--text);
  line-height: 1.55;
}
.panel.prose p { margin: 8px 0 12px; }
.panel.prose ul,
.panel.prose ol { padding-left: 22px; margin: 8px 0 14px; }
.panel.prose li { margin: 6px 0; }
.panel.prose h3 {
  color: var(--text);
  text-transform: none;
  letter-spacing: 0;
  font-size: 1.02rem;
  margin-top: 18px;
  margin-bottom: 6px;
}
.panel.prose code {
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.9em;
}

.doc {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 18px 60px;
}
.doc h1 { font-size: 1.4rem; }
.doc h2 { font-size: 1.05rem; margin-top: 22px; }
.doc p, .doc li { color: var(--text); }
.doc a.back { display: inline-block; margin-top: 20px; }