/* track — modern UI, 2026.
   Neutral slate system + teal accent. Light & dark. No decorative gold;
   the only yellow is the method-defined "yellow stamp" itself. */

:root {
  color-scheme: light dark;

  --bg: #f5f7f9;
  --bg-grad: radial-gradient(110% 70% at 50% -20%, #e9f6f4 0%, rgba(233, 246, 244, 0) 45%);
  --surface: #ffffff;
  --surface-2: #f1f4f7;
  --ink: #0c1320;
  --ink-soft: #586173;
  --ink-faint: #8a93a3;
  --line: #e9edf2;
  --line-strong: #d7dde6;

  --brand: #0e9488;
  --brand-strong: #0c7268;
  --brand-tint: #e6f6f3;
  --on-brand: #ffffff;
  --ring: rgba(14, 148, 136, 0.30);

  /* Creighton stamp colors (method-defined) */
  --stamp-red: #e0454c;
  --stamp-green: #2ea36a;
  --stamp-white: #ffffff;
  --stamp-white-ink: #0c1320;
  --stamp-yellow: #f3c40a;
  --stamp-yellow-ink: #3a2f00;
  --fertile: rgba(14, 148, 136, 0.07);

  --ui: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 22px;

  --shadow-xs: 0 1px 2px rgba(12, 19, 32, 0.05);
  --shadow-sm: 0 1px 3px rgba(12, 19, 32, 0.06), 0 1px 2px rgba(12, 19, 32, 0.04);
  --shadow-md: 0 10px 30px -8px rgba(12, 19, 32, 0.18);
  --shadow-lg: 0 30px 70px -20px rgba(12, 19, 32, 0.45);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0e14;
    --bg-grad: radial-gradient(110% 70% at 50% -20%, rgba(20, 184, 166, 0.10) 0%, rgba(10, 14, 20, 0) 48%);
    --surface: #141a23;
    --surface-2: #1b222d;
    --ink: #eaeef4;
    --ink-soft: #9aa6b6;
    --ink-faint: #6b7585;
    --line: #232c38;
    --line-strong: #323d4c;

    --brand: #2dd4bf;
    --brand-strong: #5eead4;
    --brand-tint: rgba(45, 212, 191, 0.14);
    --on-brand: #04201c;
    --ring: rgba(45, 212, 191, 0.35);

    --stamp-red: #f2555b;
    --stamp-green: #3ec07f;
    --stamp-white: #e8edf3;
    --stamp-white-ink: #0c1320;
    --stamp-yellow: #f5cf2b;
    --fertile: rgba(45, 212, 191, 0.10);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 12px 34px -10px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 30px 80px -24px rgba(0, 0, 0, 0.8);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--ui);
  color: var(--ink);
  background: var(--bg-grad), var(--bg);
  background-attachment: fixed;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: -0.011em;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; border-radius: 4px; }

/* ── header ── */
.chrome {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.95rem clamp(1rem, 4vw, 2.5rem);
  background: color-mix(in srgb, var(--surface) 72%, transparent);
  backdrop-filter: saturate(150%) blur(14px);
  -webkit-backdrop-filter: saturate(150%) blur(14px);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 5;
}
.mark { display: inline-flex; align-items: center; gap: 0.55rem; color: var(--brand); }
.heart { width: 1.3rem; height: 1.3rem; }
.mark-word {
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.chrome-nav { display: flex; align-items: center; gap: 1.25rem; font-size: 0.85rem; }
.chrome-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  letter-spacing: -0.01em;
  font-weight: 500;
  transition: color 0.14s;
}
.chrome-nav a:hover { color: var(--brand); }
.who { color: var(--ink-faint); font-size: 0.78rem; font-weight: 450; }

main { max-width: 1120px; margin: 0 auto; padding: clamp(1.5rem, 3.5vw, 2.5rem); }

/* ── summary ── */
.summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.85rem;
  margin-bottom: 1.9rem;
}
.stat {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 1.15rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  box-shadow: var(--shadow-sm);
}
.stat-num { font-size: 2rem; line-height: 1; color: var(--ink); font-weight: 700; letter-spacing: -0.03em; font-variant-numeric: tabular-nums; }
.stat-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.09em; color: var(--ink-faint); font-weight: 600; }

/* ── toolbar ── */
.toolbar { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; margin-bottom: 1.5rem; }
.toggle { display: inline-flex; align-items: center; gap: 0.45rem; font-size: 0.82rem; color: var(--ink-soft); margin-left: auto; cursor: pointer; user-select: none; font-weight: 500; }
.toggle input { accent-color: var(--brand); width: 1rem; height: 1rem; }

.btn {
  font-family: var(--ui);
  font-size: 0.875rem;
  font-weight: 550;
  padding: 0.58rem 1.05rem;
  border-radius: var(--r-md);
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  transition: background 0.14s, border-color 0.14s, box-shadow 0.14s, transform 0.08s;
}
.btn:hover { border-color: var(--brand); box-shadow: var(--shadow-xs); }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--brand); border-color: var(--brand); color: var(--on-brand); box-shadow: 0 4px 14px -4px var(--ring); }
.btn-primary:hover { background: var(--brand-strong); border-color: var(--brand-strong); }
.btn-ghost { background: transparent; border-color: transparent; }
.btn-ghost:hover { background: var(--surface-2); border-color: var(--line); }
.btn-danger { background: transparent; border-color: color-mix(in srgb, var(--stamp-red) 55%, transparent); color: var(--stamp-red); }
.btn-danger:hover { background: var(--stamp-red); color: #fff; border-color: var(--stamp-red); }
.btn:disabled { opacity: 0.5; cursor: default; box-shadow: none; }
.link-btn { background: none; border: none; color: var(--brand); font-size: 0.8rem; cursor: pointer; padding: 0.15rem 0.4rem; font-family: var(--ui); font-weight: 550; border-radius: var(--r-sm); transition: background 0.12s; }
.link-btn:hover { background: var(--brand-tint); }
.link-danger { color: var(--stamp-red); }
.link-danger:hover { background: color-mix(in srgb, var(--stamp-red) 14%, transparent); }

/* ── chart ── */
.cycle-block, .loose-block { margin-bottom: 2rem; }
.cycle-head { display: flex; align-items: baseline; gap: 0.7rem; margin-bottom: 0.7rem; }
.cycle-name { font-size: 1.05rem; color: var(--ink); font-weight: 650; letter-spacing: -0.02em; }
.cycle-meta { font-size: 0.8rem; color: var(--ink-faint); font-weight: 450; }
.cycle-head .link-btn { margin-left: auto; }

.strip {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 0.6rem;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}
.cell {
  position: relative;
  flex: 0 0 auto;
  width: 58px;
  height: 76px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--surface);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: var(--ui);
  padding: 2px;
  box-shadow: var(--shadow-xs);
  transition: transform 0.12s cubic-bezier(0.2, 0.7, 0.3, 1), box-shadow 0.12s;
}
.cell:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); z-index: 1; }
.cell-day { position: absolute; top: 4px; left: 6px; font-size: 0.6rem; font-weight: 650; color: var(--ink-faint); font-variant-numeric: tabular-nums; }
.cell-peak { position: absolute; top: 3px; right: 6px; font-size: 0.72rem; font-weight: 750; color: var(--ink); }
.cell-code { font-size: 0.84rem; font-weight: 650; text-align: center; line-height: 1.05; word-break: break-word; letter-spacing: -0.02em; }
.cell-count { position: absolute; bottom: 4px; right: 5px; font-size: 0.56rem; font-weight: 650; background: var(--brand); color: var(--on-brand); border-radius: 999px; min-width: 14px; text-align: center; padding: 0 4px; line-height: 1.55; }

.cell.fertile { background: var(--fertile); }
.cell.stamp-red { background: var(--stamp-red); color: #fff; border-color: transparent; }
.cell.stamp-red .cell-day, .cell.stamp-red .cell-peak { color: rgba(255,255,255,0.92); }
.cell.stamp-green { background: var(--stamp-green); color: #fff; border-color: transparent; }
.cell.stamp-green .cell-day { color: rgba(255,255,255,0.92); }
.cell.stamp-white { background: var(--stamp-white); color: var(--stamp-white-ink); border-color: var(--line-strong); }
.cell.stamp-white .cell-day, .cell.stamp-white .cell-peak { color: var(--ink-soft); }
.cell.stamp-yellow { background: var(--stamp-yellow); border-color: transparent; color: var(--stamp-yellow-ink); }
.cell.stamp-yellow .cell-day, .cell.stamp-yellow .cell-peak { color: color-mix(in srgb, var(--stamp-yellow-ink) 70%, transparent); }
.cell.stamp-empty { background: transparent; border-style: dashed; border-color: var(--line-strong); box-shadow: none; }
.cell.stamp-empty:hover { border-color: var(--brand); border-style: solid; }
.cell.today { box-shadow: 0 0 0 2px var(--brand); }
.cell.peaktype .cell-code { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 3px; }

/* fertile-day indicator (the Creighton "baby"): a small dot, not an emoji */
.cell.stamp-white::after, .cell.stamp-yellow::after {
  content: "";
  position: absolute;
  bottom: 6px;
  left: 7px;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--brand);
  opacity: 0.85;
}
.cell.stamp-yellow::after { background: var(--stamp-yellow-ink); opacity: 0.55; }

.empty { color: var(--ink-soft); padding: 3rem 0; font-size: 0.95rem; }
.disclaimer { margin-top: 2.5rem; font-size: 0.74rem; color: var(--ink-faint); line-height: 1.6; max-width: 64ch; padding-top: 1.4rem; border-top: 1px solid var(--line); }

/* ── dialogs ── */
.dialog {
  border: none;
  border-radius: var(--r-xl);
  padding: 0;
  margin: auto;
  width: min(460px, 94vw);
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-lg);
  animation: dialog-in 0.18s cubic-bezier(0.2, 0.7, 0.3, 1);
}
@keyframes dialog-in { from { opacity: 0; transform: translateY(8px) scale(0.98); } to { opacity: 1; transform: none; } }
.dialog::backdrop { background: rgba(6, 12, 18, 0.5); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }
.dialog form, .dialog #day-body { padding: 1.6rem; display: flex; flex-direction: column; gap: 1.05rem; }
.dialog h2 { font-weight: 700; font-size: 1.3rem; letter-spacing: -0.025em; color: var(--ink); }

.obs-head { display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; flex-wrap: wrap; }
.seg { display: inline-flex; background: var(--surface-2); border: 1px solid var(--line); border-radius: 999px; padding: 3px; gap: 2px; }
.seg-btn {
  font-family: var(--ui);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.3rem 0.8rem;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  transition: background 0.14s, color 0.14s;
}
.seg-btn.active { background: var(--surface); color: var(--brand); box-shadow: var(--shadow-xs); }

.field { display: flex; flex-direction: column; gap: 0.35rem; font-size: 0.8rem; color: var(--ink-soft); font-weight: 550; }
.field input {
  font-family: var(--ui);
  font-size: 0.95rem;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: var(--surface);
  color: var(--ink);
  transition: border-color 0.14s, box-shadow 0.14s;
}
.field input:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px var(--ring); }
fieldset { border: none; }
fieldset legend { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-faint); margin-bottom: 0.5rem; font-weight: 650; }

.chips { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.chip {
  font-family: var(--ui);
  font-size: 0.82rem;
  font-weight: 550;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, color 0.12s, transform 0.08s;
}
.chip:hover { border-color: var(--brand); background: var(--brand-tint); }
.chip:active { transform: scale(0.96); }
.chip.active { background: var(--brand); border-color: var(--brand); color: var(--on-brand); }

.preview {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.8rem 0.95rem;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}
.preview-stamp { width: 24px; height: 24px; border-radius: var(--r-sm); border: 1px solid var(--line-strong); flex: 0 0 auto; }
.preview-stamp.stamp-red { background: var(--stamp-red); border-color: transparent; }
.preview-stamp.stamp-green { background: var(--stamp-green); border-color: transparent; }
.preview-stamp.stamp-white { background: var(--stamp-white); }
.preview-stamp.stamp-yellow { background: var(--stamp-yellow); border-color: transparent; }
.preview-code { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.02em; color: var(--ink); }
.preview-type { font-size: 0.72rem; color: var(--brand); font-weight: 650; margin-left: auto; text-transform: uppercase; letter-spacing: 0.06em; }

.form-error { color: var(--stamp-red); font-size: 0.8rem; min-height: 1em; font-weight: 500; }

.dialog-actions { display: flex; gap: 0.6rem; align-items: center; list-style: none; padding: 0; margin: 0; }
.dialog-actions .spacer { flex: 1; }

/* day dialog */
.day-obs { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }
.day-obs-row { display: flex; align-items: center; gap: 0.6rem; padding: 0.6rem 0.7rem; border: 1px solid var(--line); border-radius: var(--r-md); background: var(--surface); }
.day-stamp { width: 16px; height: 16px; border-radius: var(--r-sm); border: 1px solid var(--line-strong); flex: 0 0 auto; }
.day-stamp.stamp-red { background: var(--stamp-red); border-color: transparent; }
.day-stamp.stamp-green { background: var(--stamp-green); border-color: transparent; }
.day-stamp.stamp-white { background: var(--stamp-white); }
.day-stamp.stamp-yellow { background: var(--stamp-yellow); border-color: transparent; }
.day-code { font-weight: 650; color: var(--ink); }
.day-note { color: var(--ink-soft); font-size: 0.8rem; font-style: italic; }
.day-row-actions { margin-left: auto; display: flex; gap: 0.2rem; }
.tag { font-size: 0.64rem; background: var(--brand-tint); color: var(--brand-strong); padding: 0.14rem 0.5rem; border-radius: 999px; font-weight: 650; text-transform: uppercase; letter-spacing: 0.05em; }
.day-empty { color: var(--ink-soft); }
.day-cycle-actions { display: flex; }

@media (max-width: 620px) {
  .summary { grid-template-columns: repeat(2, 1fr); }
  .stat-num { font-size: 1.7rem; }
}