/* =========================================================
   Singapore Procedural Deadline Calculator
   Design inspired by Anderson Mori & Tomotsune (amt-law.com)
   Palette: #004887 blue · #f1f5fa light ground · #111 text
   ========================================================= */

/* ── Reset & Variables ───────────────────────────────────── */

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

:root {
  --blue:        #004887;
  --blue-hover:  #326c9f;
  --blue-light:  #e8eef6;
  --page-bg:     #f1f5fa;
  --card-bg:     #ffffff;
  --text:        #111111;
  --text-muted:  #5a5a5a;
  --border:      #cccccc;
  --border-light:#dde3ed;
  --warn-bg:     #fdf6e3;
  --warn-text:   #6b4c00;
  --warn-border: #e0c96a;
  --font: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI',
          'Helvetica Neue', Arial, sans-serif;
  --max-w: 900px;
}

html { font-size: 16px; }

body {
  font-family: var(--font);
  font-size: 1rem;          /* 16 px ≈ 12 pt */
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--text);
  background: var(--page-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Header ──────────────────────────────────────────────── */

header {
  background: var(--blue);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 28px 40px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.header-icon {
  color: rgba(255,255,255,0.85);
  font-size: 2rem;
  line-height: 1;
  flex-shrink: 0;
}

.header-text h1 {
  font-family: 'Manrope', var(--font);
  font-size: 1.625rem;      /* 26 px — one step up from 22 px */
  font-weight: 700;
  letter-spacing: -0.03em;
  color: #ffffff;
  line-height: 1.3;
}

.header-text p {
  font-size: 0.8125rem;     /* 13 px */
  color: rgba(255,255,255,0.75);
  margin-top: 4px;
  letter-spacing: 0.02em;
}

/* ── Main container ──────────────────────────────────────── */

main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px 40px 80px;
}

/* ── Disclaimer banner ───────────────────────────────────── */

.disclaimer {
  border-left: 3px solid var(--warn-border);
  background: var(--warn-bg);
  padding: 14px 18px;
  font-size: 0.8125rem;
  color: var(--warn-text);
  line-height: 1.65;
  margin-bottom: 32px;
  text-align: justify;
  hyphens: auto;
}

.disclaimer a {
  color: var(--warn-text);
  text-decoration: underline;
}

/* ── Cards ───────────────────────────────────────────────── */

.card {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  padding: 32px 36px 28px;
  margin-bottom: 24px;
}

.card h2 {
  font-size: 0.75rem;       /* 12 px */
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.step-badge {
  background: var(--blue);
  color: #fff;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 600;
  flex-shrink: 0;
  letter-spacing: 0;
}

/* ── Form elements ───────────────────────────────────────── */

.form-group { margin-bottom: 20px; }

label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text);
  margin-bottom: 7px;
}

select,
input[type="date"] {
  width: 100%;
  padding: 10px 14px;
  font-family: var(--font);
  font-size: 0.9375rem;
  color: var(--text);
  background: #fff;
  border: 1px solid var(--border);
  outline: none;
  transition: border-color 0.25s;
  appearance: auto;
  letter-spacing: 0.01em;
}

select:focus,
input[type="date"]:focus {
  border-color: var(--blue);
}

select optgroup {
  font-weight: 600;
  color: var(--blue);
}

.trigger-note {
  margin-top: 10px;
  padding: 10px 14px;
  background: var(--blue-light);
  border-left: 3px solid var(--blue);
  font-size: 0.8125rem;
  color: var(--text);
  line-height: 1.55;
  display: none;
}

.trigger-note.visible { display: block; }

.helper-text {
  margin-top: 6px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── Buttons ─────────────────────────────────────────────── */

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--blue);
  color: #fff;
  border: none;
  padding: 11px 28px;
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background 0.4s;
  text-transform: uppercase;
}

.btn-primary:hover  { background: var(--blue-hover); }
.btn-primary:active { opacity: 0.9; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  color: var(--blue);
  border: 1px solid var(--blue);
  padding: 10px 24px;
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background 0.4s, color 0.4s;
  text-transform: uppercase;
}

.btn-secondary:hover {
  background: var(--blue);
  color: #fff;
}

/* ── Error message ───────────────────────────────────────── */

#error-msg {
  display: none;
  margin-top: 10px;
  padding: 10px 14px;
  background: #fef2f2;
  border-left: 3px solid #c00;
  color: #900;
  font-size: 0.875rem;
  font-weight: 500;
}

/* ── Results section ─────────────────────────────────────── */

#results-section { display: none; }

.results-meta-bar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
}

.results-meta-text {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.results-meta-text strong {
  color: var(--text);
  font-weight: 500;
}

/* ── Deadline cards ──────────────────────────────────────── */

.deadline-card {
  border: 1px solid var(--border-light);
  margin-bottom: 16px;
}

.deadline-card-header {
  background: var(--blue);
  color: #fff;
  padding: 13px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* "Before" deadline — distinct warm colour */
.deadline-card-header--before {
  background: #5c3a12;
}

.dl-label {
  flex: 1;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.dl-days-pill {
  background: rgba(255,255,255,0.18);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.35);
  padding: 2px 10px;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.dl-ref {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.65);
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.deadline-card-body {
  padding: 16px 20px;
}

.dl-date-primary {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--blue);
  letter-spacing: 0.02em;
  display: block;
  margin-bottom: 6px;
}

.adjustment-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--warn-bg);
  color: var(--warn-text);
  border: 1px solid var(--warn-border);
  padding: 4px 10px;
  font-size: 0.775rem;
  font-weight: 500;
  margin-bottom: 6px;
  cursor: default;
}

.dl-computation {
  font-size: 0.775rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 4px;
  letter-spacing: 0.01em;
}

.dl-note {
  font-size: 0.825rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--border-light);
}

/* ── Trigger reference line (under results header) ───────── */

.results-ref {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 2px;
  letter-spacing: 0.01em;
}

/* ── Results caveat ──────────────────────────────────────── */

.results-caveat {
  margin-top: 12px;
  padding: 10px 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--page-bg);
  border: 1px solid var(--border-light);
  line-height: 1.55;
}

.results-caveat strong {
  color: var(--text);
}

/* ── Export bar ──────────────────────────────────────────── */

.export-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 8px;
  padding: 16px 20px;
  background: var(--blue-light);
  border: 1px solid #c2d4e8;
}

.export-bar p {
  flex: 1;
  font-size: 0.875rem;
  color: var(--text);
  min-width: 200px;
}

/* ── Info card (day-counting rules) ──────────────────────── */

.info-card {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  padding: 24px 36px;
  margin-top: 8px;
}

.info-card h3 {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 14px;
}

.info-card ul {
  padding-left: 18px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.9;
}

.info-card ul li strong {
  color: var(--text);
  font-weight: 500;
}

/* ── Loading / error ─────────────────────────────────────── */

#loading-indicator {
  padding: 24px 0;
  font-size: 0.875rem;
  color: #900;
  font-weight: 500;
}

/* ── Footer ──────────────────────────────────────────────── */

footer {
  border-top: 1px solid var(--border);
  padding: 24px 40px;
  font-size: 0.775rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.7;
  letter-spacing: 0.02em;
}

footer a {
  color: var(--blue);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* ── Calculation Calendar ────────────────────────────────── */

.cal-wrap {
  border-top: 1px solid var(--border-light);
}

.cal-toggle {
  width: 100%;
  background: none;
  border: none;
  padding: 10px 20px;
  text-align: left;
  font-family: var(--font);
  font-size: 0.725rem;
  font-weight: 500;
  color: var(--blue);
  cursor: pointer;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: background 0.2s;
}

.cal-toggle:hover { background: var(--blue-light); }

.cal-inner {
  padding: 24px 20px 32px;
  background: #f8fafd;
  border-top: 1px solid var(--border-light);
}

.cal-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
  margin-bottom: 12px;
}

.cal-legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.cal-swatch {
  width: 14px;
  height: 14px;
  display: inline-block;
  flex-shrink: 0;
  border: 1px solid rgba(0,0,0,0.12);
}

.cal-swatch--trigger          { background: #1a5e38; }
.cal-swatch--trigger-event    { background: #2c4a7c; }
.cal-swatch--counted          { background: #c8ecd8; }
.cal-swatch--deadline         { background: #c8102e; }
.cal-swatch--skipped-weekend  { background: #ebebeb; }
.cal-swatch--skipped-holiday  { background: #d0d0d0; }
.cal-swatch--skipped-vacation { background: #d0e4f7; }

.cal-summary {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 24px;
  text-align: center;
}

.cal-months {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px 40px;
}

.cal-month { width: 320px; }

.cal-month-hdr {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 10px;
  text-align: center;
}

.cal-dow-row {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  margin-bottom: 4px;
}

.cal-dow-cell {
  font-size: 0.75rem;
  font-weight: 600;
  text-align: center;
  color: var(--text-muted);
  padding: 4px 0;
  letter-spacing: 0.03em;
}

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

.cal-cell {
  position: relative;
  aspect-ratio: 1;
  min-height: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text);
  background: #fff;
  border: 1px solid rgba(0,0,0,0.06);
  overflow: hidden;
  cursor: default;
}

.cal-cell--blank,
.cal-cell--outside {
  background: transparent;
  border-color: transparent;
  color: #ccc;
}

.cal-cell--counted {
  background: #c8ecd8;
  color: #145230;
  font-weight: 500;
  border-color: #a8d8bc;
}

.cal-cell--skipped-weekend {
  background: #ebebeb;
  color: #999;
  border-color: #ddd;
}

.cal-cell--skipped-holiday {
  background: #d0d0d0;
  color: #555;
  border-color: #bbb;
}

.cal-cell--skipped-vacation {
  background: #d0e4f7;
  color: #3a618a;
  border-color: #b8d4f0;
}

.cal-cell--trigger,
.cal-cell--trigger-event {
  background: #1a5e38;
  color: #fff;
  font-weight: 700;
  border-color: #145230;
}

.cal-cell--trigger-event {
  background: #2c4a7c;
  border-color: #1e3560;
}

.cal-cell--deadline {
  background: #c8102e;
  color: #fff;
  font-weight: 700;
  border-color: #a00c25;
}

/* Small badge (PH / CV) in bottom-right corner */
.cal-cell[data-badge]::after {
  content: attr(data-badge);
  position: absolute;
  bottom: 3px;
  right: 3px;
  font-size: 0.55rem;
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1;
  opacity: 0.75;
}

.cal-cell-num {
  font-size: 0.875rem;
  line-height: 1;
}

.cal-cell-lbl {
  font-size: 0.5rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1;
  margin-top: 3px;
  opacity: 0.88;
}

/* ── Responsive ──────────────────────────────────────────── */

@media (max-width: 640px) {
  .header-inner { padding: 20px 16px; flex-direction: column; text-align: center; gap: 8px; }
  main { padding: 24px 16px 60px; }
  .card { padding: 24px 20px; }
  .info-card { padding: 20px 20px; }
  .results-meta-bar { flex-direction: column; }
  .export-bar { flex-direction: column; align-items: flex-start; }
  footer { padding: 20px 16px; }
}