:root {
  --bg: #1a1a1c;           /* rubber gym flooring */
  --surface: #232326;
  --surface-2: #1d1e20;
  --border: #2e2f33;
  --text: #f2f0ea;         /* chalk white */
  --muted: #8d8b87;
  --plate-red: #d6362b;    /* 25kg — heavy day */
  --plate-yellow: #d9a93a; /* 15kg — moderate day */
  --plate-green: #3f7a46;  /* 10kg — light day */
  --plate-red-dim: #4a2320;

  --font-display: "Oswald", sans-serif;
  --font-body: "Inter", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.eyebrow {
  font-family: var(--font-display);
  letter-spacing: 0.18em;
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  margin: 0 0 4px;
}

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; margin: 0; }
.mono { font-family: var(--font-mono); }

.screen { display: none; min-height: 100vh; padding: 24px 20px 100px; max-width: 480px; margin: 0 auto; }
.screen.active { display: block; }

/* ---- Auth ---- */
.auth-card { padding-top: 12vh; }
.brand { font-size: 30px; line-height: 1.15; margin-bottom: 28px; }
.tabs { display: flex; gap: 6px; margin-bottom: 20px; background: var(--surface); border-radius: 10px; padding: 4px; }
.tab {
  flex: 1; padding: 10px; border: none; background: transparent; color: var(--muted);
  font-family: var(--font-display); letter-spacing: 0.04em; border-radius: 8px; cursor: pointer;
}
.tab.active { background: var(--plate-red); color: #fff; }

.auth-form { display: none; flex-direction: column; gap: 14px; }
.auth-form.active { display: flex; }

label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); }
input {
  background: var(--surface); border: 1px solid var(--border); color: var(--text);
  padding: 12px 14px; border-radius: 10px; font-size: 16px; font-family: var(--font-body);
}
input:focus { outline: 2px solid var(--plate-red); outline-offset: 1px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.btn-primary {
  background: var(--plate-red); color: #fff; border: none; padding: 14px; border-radius: 10px;
  font-family: var(--font-display); font-size: 15px; letter-spacing: 0.04em; cursor: pointer; margin-top: 4px;
}
.btn-primary:focus-visible, .btn-secondary:focus-visible { outline: 2px solid var(--plate-yellow); outline-offset: 2px; }
.btn-secondary {
  background: transparent; color: var(--text); border: 1px solid var(--border); padding: 12px; border-radius: 10px;
  font-family: var(--font-display); letter-spacing: 0.03em; cursor: pointer; width: 100%; margin-top: 12px;
}
.form-error { color: var(--plate-red); font-size: 13px; min-height: 16px; }

/* ---- App header ---- */
.app-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 16px; }
.header-actions { display: flex; gap: 8px; }
.icon-btn {
  background: var(--surface); border: 1px solid var(--border); color: var(--text);
  width: 36px; height: 36px; border-radius: 50%; cursor: pointer; font-size: 15px;
}

.totals-strip {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 20px;
}
.totals-strip > div {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 12px 10px; text-align: center;
}
.totals-strip .mono { display: block; font-size: 20px; }
.totals-strip small { color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; }

.month-nav { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.weekday-row { display: grid; grid-template-columns: repeat(7, 1fr); text-align: center; color: var(--muted); font-size: 12px; margin-bottom: 6px; }

/* ---- Calendar heatmap (signature element) ---- */
.calendar-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px; }
.day-cell {
  aspect-ratio: 1; border-radius: 10px; border: 1px solid var(--border); background: var(--surface-2);
  display: flex; flex-direction: column; align-items: center; justify-content: center; cursor: pointer;
  font-family: var(--font-mono); font-size: 12px; color: var(--muted); position: relative;
}
.day-cell.empty { visibility: hidden; cursor: default; }
.day-cell .day-num { font-size: 13px; }
.day-cell.today { border-color: var(--text); }
.day-cell.rest { background: var(--surface-2); }
.day-cell.light { background: var(--plate-green); color: #fff; }
.day-cell.moderate { background: var(--plate-yellow); color: #1a1a1c; }
.day-cell.heavy { background: var(--plate-red); color: #fff; }

/* ---- FAB (plate disc) ---- */
.fab {
  position: fixed; right: 20px; bottom: 28px; width: 60px; height: 60px; border-radius: 50%;
  background: var(--plate-red); color: #fff; border: 4px solid var(--plate-red-dim); font-size: 28px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4); cursor: pointer; z-index: 5;
}

/* ---- Bottom sheets ---- */
.sheet-backdrop {
  position: fixed; inset: 0; background: rgba(0,0,0,0.55); opacity: 0; pointer-events: none; transition: opacity 0.2s; z-index: 10;
}
.sheet-backdrop.active { opacity: 1; pointer-events: auto; }

.sheet {
  position: fixed; left: 0; right: 0; bottom: 0; max-width: 480px; margin: 0 auto;
  background: var(--surface); border-radius: 20px 20px 0 0; padding: 10px 20px 28px;
  transform: translateY(105%); transition: transform 0.25s ease; z-index: 11; max-height: 85vh; overflow-y: auto;
  border-top: 1px solid var(--border);
}
.sheet.active { transform: translateY(0); }
.sheet-handle { width: 40px; height: 4px; background: var(--border); border-radius: 2px; margin: 6px auto 14px; }
.sheet-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }

#form-log, #form-profile { display: flex; flex-direction: column; gap: 14px; }
.hint { font-size: 12px; color: var(--muted); margin: -6px 0 0; }

.entries-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; }
.entry-row {
  display: flex; justify-content: space-between; align-items: center; background: var(--surface-2);
  border: 1px solid var(--border); border-radius: 10px; padding: 12px;
}
.entry-row .ex-name { font-family: var(--font-display); letter-spacing: 0.02em; text-transform: capitalize; }
.entry-row .ex-meta { color: var(--muted); font-size: 12px; }
.entry-row .ex-cal { font-family: var(--font-mono); color: var(--plate-yellow); }
.sheet-total { text-align: right; color: var(--muted); margin: 4px 0 0; }
.empty-state { color: var(--muted); font-size: 14px; text-align: center; padding: 20px 0; }

@media (prefers-reduced-motion: reduce) {
  .sheet, .sheet-backdrop { transition: none; }
}