:root {
  --bg: #0f1115;
  --bg-elev: #181b22;
  --bg-elev-2: #1f2330;
  --border: #2a2f3d;
  --fg: #e8eaef;
  --fg-muted: #9aa3b2;
  --accent: #d4a574;          /* coffee crema */
  --accent-strong: #c98c4d;
  --danger: #e57373;
  --warn: #f1b955;
  --ok: #81c995;
  --shadow: 0 4px 20px rgba(0,0,0,0.35);
  --radius: 12px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #fafaf7;
    --bg-elev: #ffffff;
    --bg-elev-2: #f3f1ec;
    --border: #e3ddd2;
    --fg: #1a1a1a;
    --fg-muted: #6a6a6a;
    --accent: #8b5a2b;
    --accent-strong: #6f4520;
    --shadow: 0 2px 14px rgba(0,0,0,0.06);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  font-size: 15px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.hidden { display: none !important; }
.muted { color: var(--fg-muted); }
.small { font-size: 0.85em; }
.error { color: var(--danger); min-height: 1.2em; margin-top: 0.4em; font-size: 0.9em; }
.status { color: var(--ok); min-height: 1.2em; margin-top: 0.4em; font-size: 0.9em; }

/* ---------- Auth ---------- */
#auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.auth-card {
  background: var(--bg-elev);
  padding: 2rem;
  border-radius: var(--radius);
  width: 100%;
  max-width: 380px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.auth-card h1 { margin: 0 0 0.2rem 0; font-size: 1.5rem; }
.auth-card .tabs {
  display: flex;
  gap: 0.5rem;
  margin: 1.2rem 0 1rem;
  border-bottom: 1px solid var(--border);
}
.auth-card .tab {
  background: none;
  border: none;
  color: var(--fg-muted);
  padding: 0.6rem 0.4rem;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  font-size: 1rem;
}
.auth-card .tab.active { color: var(--fg); border-bottom-color: var(--accent); }
.auth-form { display: flex; flex-direction: column; gap: 0.4rem; }
.auth-form label { font-size: 0.85em; color: var(--fg-muted); margin-top: 0.4rem; }
.auth-form input, .auth-form button { font-size: 1rem; }

/* ---------- Inputs / Buttons ---------- */
input, select, button, textarea {
  font-family: inherit;
}
input[type=text], input[type=password], input[type=number], input[type=time],
input[type=datetime-local], input[type=email], select, textarea {
  background: var(--bg-elev-2);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  width: 100%;
}
input[type=range] {
  width: 100%;
  accent-color: var(--accent);
}

button {
  cursor: pointer;
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 0.6rem 1rem;
  font-size: 0.95rem;
  background: var(--bg-elev-2);
  color: var(--fg);
}
button:hover { filter: brightness(1.08); }
button.primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent-strong);
  margin-top: 0.6rem;
}
button.ghost {
  background: transparent;
  color: var(--fg-muted);
  border: 1px solid var(--border);
}

/* ---------- App layout ---------- */
.topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.7rem 1rem;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  flex-wrap: wrap;
}
.brand { font-weight: 600; font-size: 1.05rem; }
.nav { display: flex; gap: 0.3rem; flex: 1; }
.nav-btn {
  background: none;
  border: none;
  color: var(--fg-muted);
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
}
.nav-btn.active { background: var(--bg-elev-2); color: var(--fg); }
.user-area { display: flex; align-items: center; gap: 0.6rem; }

.view {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem;
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
@media (min-width: 900px) {
  .grid { grid-template-columns: 1.4fr 1fr; }
  .grid > .big { grid-column: 1 / -1; }
}

.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  box-shadow: var(--shadow);
}
.card-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.6rem;
}
.card h2 { margin: 0; font-size: 1.05rem; font-weight: 600; }

/* ---------- Metrics ---------- */
.metric-row {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}
.metric { flex: 1; min-width: 140px; }
.metric-value {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.1;
}
.metric-unit { color: var(--fg-muted); font-size: 0.85rem; }
.metric-status {
  display: inline-block;
  margin-top: 0.3rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
}
.metric-status.ok { background: rgba(129, 201, 149, 0.18); color: var(--ok); }
.metric-status.warn { background: rgba(241, 185, 85, 0.18); color: var(--warn); }
.metric-status.bad { background: rgba(229, 115, 115, 0.18); color: var(--danger); }

.legend { margin-top: 0.5rem; }

/* Chart canvas containers — fixed height prevents Chart.js from
   growing the canvas infinitely when maintainAspectRatio:false is used. */
.chart-wrap {
  position: relative;
  width: 100%;
  height: 240px;
  margin: 0.5rem 0;
}
.chart-wrap-history {
  height: 280px;
}
.chart-wrap canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}
@media (max-width: 600px) {
  .chart-wrap { height: 200px; }
  .chart-wrap-history { height: 240px; }
}

/* ---------- Drink form ---------- */
.drink-form { display: flex; flex-direction: column; gap: 0.3rem; }
.drink-form label { font-size: 0.85em; color: var(--fg-muted); margin-top: 0.4rem; }
.time-row { display: flex; gap: 0.5rem; }
.time-row input { flex: 1; }
.dose-preview {
  margin-top: 0.6rem;
  padding: 0.5rem 0.7rem;
  background: var(--bg-elev-2);
  border-radius: 8px;
  text-align: center;
  font-weight: 600;
  color: var(--accent);
}

/* ---------- Cutoff table ---------- */
.cutoff-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 0.5rem;
}
.cutoff-table th, .cutoff-table td {
  padding: 0.45rem 0.4rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
}
.cutoff-table th { color: var(--fg-muted); font-weight: 500; }
.cutoff-table .ok { color: var(--ok); font-weight: 600; }
.cutoff-table .warn { color: var(--warn); font-weight: 600; }
.cutoff-table .bad { color: var(--danger); font-weight: 600; }

/* ---------- Drink list ---------- */
.drink-list { list-style: none; padding: 0; margin: 0; }
.drink-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--border);
  gap: 0.5rem;
}
.drink-list li:last-child { border-bottom: none; }
.drink-list .li-main { display: flex; flex-direction: column; }
.drink-list .li-label { font-weight: 500; }
.drink-list .li-meta { color: var(--fg-muted); font-size: 0.82rem; }
.drink-list .li-mg {
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
}
.drink-list .li-actions {
  display: flex;
  gap: 0.3rem;
}
.drink-list .li-del {
  background: none; border: none; color: var(--fg-muted);
  font-size: 1.05rem; padding: 0.2rem 0.4rem;
}
.drink-list .li-del:hover { color: var(--danger); }

.sum-today { font-weight: 500; }

/* ---------- Settings ---------- */
.settings-form fieldset {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.8rem 1rem;
  margin-bottom: 1rem;
}
.settings-form legend {
  padding: 0 0.4rem;
  color: var(--fg-muted);
  font-size: 0.85rem;
}
.settings-form label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.95rem;
}
details.info {
  margin-top: 0.6rem;
  background: var(--bg-elev-2);
  border-radius: 8px;
  padding: 0.5rem 0.7rem;
}
details.info summary {
  cursor: pointer;
  color: var(--fg-muted);
  font-size: 0.85rem;
}
details.info p, details.info ul {
  margin: 0.5rem 0;
  font-size: 0.9rem;
}
details.info ul { padding-left: 1.2rem; }

/* ---------- History ---------- */
#history-list { margin-top: 1rem; }
.history-day {
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
}
.history-day h3 { margin: 0 0 0.3rem; font-size: 0.95rem; }
.history-day .day-sum { color: var(--accent); font-weight: 600; }
.history-day ul { list-style: none; padding: 0; margin: 0.3rem 0 0 0; }
.history-day li {
  display: flex; justify-content: space-between;
  font-size: 0.88rem; padding: 0.2rem 0; color: var(--fg-muted);
}

/* ---------- Mobile tweaks ---------- */
@media (max-width: 600px) {
  .topbar { padding: 0.5rem 0.7rem; gap: 0.5rem; }
  .brand { font-size: 1rem; }
  .nav-btn { padding: 0.35rem 0.5rem; font-size: 0.88rem; }
  .user-area span { display: none; }
  .view { padding: 0.7rem; }
  .card { padding: 0.85rem 0.9rem; }
  .metric-value { font-size: 1.8rem; }
}