:root {
  --ink: #0f2240;
  --ink-2: #2c4268;
  --ink-3: #425670;
  --cream: #f7f4ef;
  --cream-2: #eeeae2;
  --amber: #d4870a;
  --amber-light: #fdf3df;
  --amber-border: #f0c97a;
  --white: #ffffff;
  --danger: #b83232;
  --danger-light: #fdf0f0;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(15,34,64,.07), 0 1px 2px rgba(15,34,64,.04);
  --shadow-md: 0 4px 16px rgba(15,34,64,.10), 0 1px 4px rgba(15,34,64,.06);
  --shadow-lg: 0 12px 40px rgba(15,34,64,.13), 0 2px 8px rgba(15,34,64,.07);
  --font-serif: 'DM Serif Display', Georgia, serif;
  --font-sans: 'DM Sans', system-ui, sans-serif;
  --font-mono: 'DM Mono', 'Courier New', monospace;
  --max-w: 680px;
  --transition: 220ms cubic-bezier(.4,0,.2,1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  max-width: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  background: var(--cream);
  color: var(--ink);
  line-height: 1.6;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  max-width: 100%;
  overflow-x: hidden;
}

main { flex: 1; }

.hidden { display: none !important; }

.site-header {
  background: var(--ink);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(255,255,255,.06);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--white);
}

.logo-mark {
  width: 32px;
  height: 32px;
  background: var(--amber);
  color: var(--white);
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 400;
  flex-shrink: 0;
  line-height: 1;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  letter-spacing: .01em;
}

.header-tag {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: #ffffff;
}

.view {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px 20px 60px;
  width: 100%;
}

.intro-block {
  margin-bottom: 40px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--cream-2);
}

.headline {
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 5vw, 2.7rem);
  line-height: 1.18;
  color: var(--ink);
  margin-bottom: 14px;
  font-weight: 400;
}

.headline em {
  font-style: italic;
  color: var(--amber);
}

.subhead {
  font-size: .97rem;
  color: var(--ink-3);
  line-height: 1.7;
  max-width: 540px;
}

.subhead strong { color: var(--ink); font-weight: 600; }

#calc-form { display: flex; flex-direction: column; gap: 28px; }

.field-group {
  border: none;
  padding: 0;
}

.field-label {
  display: block;
  font-weight: 600;
  font-size: .88rem;
  letter-spacing: .03em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin-bottom: 10px;
}

.field-sub {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--ink-3);
  font-size: .82rem;
}

.field-hint {
  font-size: .8rem;
  color: var(--ink-3);
  margin-top: 7px;
}

.field-error {
  font-size: .82rem;
  color: var(--danger);
  margin-top: 6px;
  font-weight: 500;
}

.input-date,
.input-select {
  width: 100%;
  padding: 12px 14px;
  background: var(--white);
  border: 1.5px solid var(--cream-2);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: .95rem;
  color: var(--ink);
  appearance: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-sm);
}

.input-date:focus,
.input-select:focus {
  outline: none;
  border-color: var(--amber);
  box-shadow: 0 0 0 3px rgba(212,135,10,.15);
}

.select-wrap { position: relative; }

.select-wrap::after {
  content: '▾';
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ink-3);
  pointer-events: none;
  font-size: .85rem;
}

.toggle-row { display: flex; gap: 10px; flex-wrap: wrap; }

.toggle-btn {
  padding: 10px 20px;
  background: var(--white);
  border: 1.5px solid var(--cream-2);
  border-radius: 100px;
  font-family: var(--font-sans);
  font-size: .9rem;
  font-weight: 500;
  color: var(--ink-3);
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}

.toggle-btn:hover { border-color: var(--amber); color: var(--ink); }

.toggle-btn.active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--white);
  box-shadow: var(--shadow-sm);
}

.needle-row {
  display: flex;
  align-items: center;
  gap: 0;
  width: fit-content;
  background: var(--white);
  border: 1.5px solid var(--cream-2);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.stepper {
  width: 44px;
  height: 48px;
  background: var(--cream);
  border: none;
  font-size: 1.3rem;
  font-family: var(--font-sans);
  color: var(--ink-2);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.stepper:hover { background: var(--cream-2); color: var(--ink); }
.stepper:active { background: var(--amber-light); }

.input-number {
  width: 80px;
  height: 48px;
  border: none;
  border-left: 1.5px solid var(--cream-2);
  border-right: 1.5px solid var(--cream-2);
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--ink);
  text-align: center;
  background: var(--white);
  padding: 0;
  -moz-appearance: textfield;
}

.input-number::-webkit-inner-spin-button,
.input-number::-webkit-outer-spin-button { appearance: none; }

.input-number:focus { outline: none; background: var(--amber-light); }

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
}

.checkbox-label input[type="checkbox"] { position: absolute; opacity: 0; width: 0; height: 0; }

.checkbox-custom {
  width: 22px;
  height: 22px;
  border: 2px solid var(--cream-2);
  border-radius: 6px;
  background: var(--white);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}

.checkbox-custom::after {
  content: '';
  width: 6px;
  height: 10px;
  border: 2.5px solid var(--white);
  border-top: none;
  border-left: none;
  transform: rotate(45deg) scale(0);
  transition: transform var(--transition);
  margin-top: -2px;
}

input[type="checkbox"]:checked ~ .checkbox-custom {
  background: var(--ink);
  border-color: var(--ink);
}

input[type="checkbox"]:checked ~ .checkbox-custom::after {
  transform: rotate(45deg) scale(1);
}

input[type="checkbox"]:focus-visible ~ .checkbox-custom {
  box-shadow: 0 0 0 3px rgba(212,135,10,.3);
}

.checkbox-text { font-size: .95rem; color: var(--ink); }

.btn-primary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 24px;
  background: var(--ink);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-md);
  width: 100%;
  max-width: 360px;
  align-self: flex-start;
}

.btn-primary:hover {
  background: var(--ink-2);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:active { transform: translateY(0); }

.btn-arrow {
  font-size: 1.2rem;
  transition: transform var(--transition);
}

.btn-primary:hover .btn-arrow { transform: translateX(4px); }

.results-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.results-title {
  font-family: var(--font-serif);
  font-size: 1.9rem;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 4px;
}

.results-subtitle {
  font-size: .88rem;
  color: var(--ink-3);
  font-family: var(--font-mono);
}

.results-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.range-label {
  font-size: .82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--ink-3);
}

.select-wrap--sm { width: 130px; }

.input-select--sm {
  padding: 8px 12px;
  font-size: .85rem;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 20px;
  margin-bottom: 36px;
}

.cal-month {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 12px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--cream-2);
  animation: fadeUp .3s ease both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.cal-month-title {
  font-family: var(--font-serif);
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--cream-2);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.cal-month-badge {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--amber);
  letter-spacing: .06em;
}

.cal-days-header {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  margin-bottom: 6px;
}

.cal-day-name {
  font-family: var(--font-mono);
  font-size: .65rem;
  text-align: center;
  color: var(--ink-3);
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: 4px 0;
}

.cal-days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
}

.cal-cell {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: .65rem;
  color: var(--ink-3);
  border-radius: 4px;
  position: relative;
  min-height: 20px;
}

.cal-cell--today {
  color: var(--ink);
  font-weight: 500;
}

.cal-cell--today::after {
  content: '';
  position: absolute;
  bottom: 3px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--ink-3);
}

.cal-cell--pen {
  background: var(--amber);
  color: var(--white);
  font-weight: 500;
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(212,135,10,.35);
  z-index: 1;
}

.cal-cell--pen::after { display: none; }

.cal-cell--empty { opacity: 0; pointer-events: none; }

.pen-legend {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  font-size: .82rem;
  color: var(--ink-3);
}

.pen-legend-dot {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  background: var(--amber);
  flex-shrink: 0;
}

.action-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  padding-top: 20px;
  border-top: 1px solid var(--cream-2);
}

.btn-ghost {
  padding: 10px 16px;
  background: var(--white);
  border: 1.5px solid var(--cream-2);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: .85rem;
  font-weight: 500;
  color: var(--ink-2);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-ghost:hover {
  background: var(--cream);
  border-color: var(--ink);
  color: var(--ink);
}

.btn-ghost--success {
  border-color: #2e7d32;
  color: #2e7d32;
  background: #f1f8f1;
}

.site-footer {
  background: var(--ink);
  color: rgba(255,255,255,.5);
  padding: 32px 20px;
  margin-top: auto;
}

.site-footer .disclaimer {
  max-width: var(--max-w);
  margin: 0 auto 12px;
  font-size: .78rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.85);
}

.site-footer .disclaimer strong { color: rgba(255,255,255,.75); }

.footer-copy {
  max-width: var(--max-w);
  margin: 0 auto;
  font-size: .75rem;
  font-family: var(--font-mono);
  color: rgba(255, 255, 255, 0.65);
}

@media (max-width: 480px) {
  .headline { font-size: 1.7rem; }
  .btn-primary { max-width: 100%; }
  .results-header { flex-direction: column; }
  .calendar-grid { 
    grid-template-columns: repeat(2, minmax(140px, 1fr));
    gap: 8px; 
  }
  .cal-month { padding: 6px; }
  .cal-month-title span { font-size: 0.8rem; }
  .cal-month-badge { display: none; }
}

@media print {
  @page {
    margin: 18mm;
    size: A4 portrait;
  }

  :root {
    --ink: #000;
    --ink-2: #222;
    --ink-3: #4a5d75;
    --cream: #fff;
    --cream-2: #ddd;
    --amber: #b36b00;
    --white: #fff;
  }

  .site-header,
  .action-bar,
  #view-form,
  .results-controls { display: none !important; }

  #view-results.hidden { display: block !important; }

  body { background: #fff; font-size: 11pt; }

  .cal-month {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }

  .calendar-grid { grid-template-columns: repeat(3, 1fr); gap: 12px; }

  .cal-cell--pen {
    background: var(--amber);
    color: #fff;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .site-footer {
  background: var(--ink);
  color: rgba(255,255,255, 0.8);
  padding: 32px 20px;
  margin-top: auto;
}

.footer-copy {
  max-width: var(--max-w);
  margin: 0 auto;
  font-size: .75rem;
  font-family: var(--font-mono);
  color: rgba(255,255,255, 0.5);
}

  .pen-legend-dot {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
}