:root {
  --bg: #f0f2f5;
  --surface: #ffffff;
  --border: #e2e6ec;
  --text: #1a1d23;
  --text-muted: #6b7280;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --green: #22c55e;
  --yellow: #f59e0b;
  --orange: #f97316;
  --red: #ef4444;
  --red-bg: #fff5f5;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,0.07), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-card: 0 2px 8px rgba(0,0,0,0.06), 0 1px 3px rgba(0,0,0,0.04);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 14px;
  line-height: 1.5;
}

/* ── Header ── */
header {
  background: #1e293b;
  color: #f8fafc;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}

.header-brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

header h1 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header-sub {
  font-size: 0.82rem;
  color: #94a3b8;
  font-weight: 400;
}

/* ── Main layout ── */
main {
  display: grid;
  grid-template-columns: 440px 1fr;
  gap: 20px;
  padding: 20px;
  max-width: 1400px;
  margin: 0 auto;
  align-items: start;
}

/* ── Config panel ── */
.config-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ── Cards ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  background: #f8fafc;
}

.section-header h2 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}

/* ── Tables ── */
.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

thead th {
  padding: 7px 10px;
  text-align: left;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
  background: #fafbfc;
  white-space: nowrap;
}

.th-hint {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: #adb5bd;
}

tbody tr:hover {
  background: #f8fafc;
}

tbody tr.row-error {
  background: var(--red-bg);
}

tbody tr.row-error:hover {
  background: #fee2e2;
}

tbody td {
  padding: 4px 6px;
  border-bottom: 1px solid #f3f4f6;
  vertical-align: middle;
}

tbody tr:last-child td {
  border-bottom: none;
}

/* ── Form inputs ── */
input[type="number"],
input[type="text"],
input[type="date"] {
  width: 100%;
  padding: 5px 8px;
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: 0.82rem;
  color: var(--text);
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
  font-family: inherit;
}

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.12);
}

.row-error input {
  border-color: #fca5a5;
}

.row-error input:focus {
  border-color: var(--red);
  box-shadow: 0 0 0 3px rgba(239,68,68,0.12);
}

.inp-year   { width: 68px; }
.inp-days   { width: 58px; }
.inp-cutoff { width: 68px; text-align: center; }
.inp-vdays  { width: 54px; }

/* ── Buttons ── */
.header-actions {
  display: flex;
  gap: 6px;
  align-items: center;
}

.btn-sort {
  padding: 5px 11px;
  background: none;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.btn-sort:hover {
  background: #f1f5f9;
  color: var(--text);
  border-color: #c8d0db;
}

.btn-add {
  padding: 5px 11px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 5px;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}

.btn-add:hover {
  background: var(--accent-hover);
}

.btn-remove {
  padding: 2px 8px;
  background: none;
  border: 1px solid #e5e7eb;
  border-radius: 4px;
  color: #9ca3af;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1.4;
  transition: all 0.15s;
  display: block;
}

.btn-remove:hover {
  background: var(--red-bg);
  border-color: #fca5a5;
  color: var(--red);
}

.btn-ghost {
  padding: 6px 13px;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.18);
  color: #cbd5e1;
  border-radius: 5px;
  font-size: 0.78rem;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.btn-ghost:hover {
  background: rgba(255,255,255,0.1);
  color: #f1f5f9;
}

/* ── Error badge ── */
.days-cell {
  display: flex;
  align-items: center;
  gap: 5px;
}

.err-badge {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  background: var(--red);
  color: #fff;
  border-radius: 50%;
  font-size: 0.68rem;
  font-weight: 700;
  cursor: help;
  user-select: none;
}

/* ── Results panel ── */
.results-panel > h2 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--text);
  padding-left: 2px;
}

/* ── Year cards ── */
.year-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  margin-bottom: 12px;
  overflow: hidden;
}

.year-card details > summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 16px 12px;
  user-select: none;
}

.year-card details > summary::-webkit-details-marker {
  display: none;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.card-title {
  display: flex;
  align-items: center;
  gap: 8px;
}

.toggle-icon {
  font-size: 0.6rem;
  color: var(--text-muted);
  display: inline-block;
  transition: transform 0.2s;
  flex-shrink: 0;
}

details[open] .toggle-icon {
  transform: rotate(90deg);
}

.card-year {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.card-stats {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.stat-allowed {
  color: var(--text-muted);
}

.stat-used {
  color: #374151;
  font-weight: 500;
}

.stat-remaining {
  font-weight: 700;
  color: #16a34a;
}

.stat-remaining.s-zero {
  color: var(--text-muted);
  font-weight: 500;
}

.stat-remaining.s-over {
  color: var(--red);
}

/* ── Progress bar ── */
.progress-bar {
  height: 6px;
  background: #e5e7eb;
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 999px;
  transition: width 0.35s ease;
  min-width: 0;
}

.p-low  { background: #38bdf8; }
.p-mid  { background: #3b82f6; }
.p-high { background: #6366f1; }
.p-full { background: #7c3aed; }
.p-over { background: var(--red); }

/* ── Vacation log ── */
.vac-log {
  list-style: none;
  border-top: 1px solid var(--border);
}

.vac-log li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 16px 7px 28px;
  font-size: 0.8rem;
  color: #374151;
  border-bottom: 1px solid #f3f4f6;
  gap: 8px;
}

.vac-log li:last-child {
  border-bottom: none;
}

.log-date {
  font-variant-numeric: tabular-nums;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.77rem;
  flex-shrink: 0;
}

.log-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.log-days {
  color: var(--text-muted);
  white-space: nowrap;
}

.cross-tag {
  font-size: 0.7rem;
  background: #eff6ff;
  color: #3b82f6;
  border: 1px solid #bfdbfe;
  border-radius: 999px;
  padding: 1px 8px;
  white-space: nowrap;
  flex-shrink: 0;
}

.no-logs {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 10px 16px 12px;
  border-top: 1px solid var(--border);
}

.no-data {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-align: center;
  padding: 32px 16px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* ── Responsive ── */
@media (max-width: 960px) {
  main {
    grid-template-columns: 1fr;
  }

  .config-panel {
    overflow-y: visible;
  }
}