:root {
  --bg: #0f172a;
  --bg-soft: #1e293b;
  --card: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --accent: #0ea5e9;
  --border: #e2e8f0;
  --weekend: #f8fafc;
  --holiday: #fef3c7;
  --sick: #fee2e2;
  --vacation: #d1fae5;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: #f1f5f9;
  line-height: 1.5;
}

/* --- Hero / Werbe-Header --- */
.hero {
  background: linear-gradient(135deg, var(--bg) 0%, #1e3a8a 60%, var(--accent) 130%);
  color: #fff;
  padding: 3.5rem 1.5rem;
}
.hero-inner { max-width: 820px; margin: 0 auto; }
.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}
.tagline {
  margin: 0;
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  color: #dbeafe;
  max-width: 70ch;
}
.tagline strong { color: #fff; }

/* --- Layout --- */
main {
  max-width: 980px;
  margin: -2rem auto 0;
  padding: 0 1.5rem 3rem;
}
.card {
  background: var(--card);
  border-radius: 16px;
  padding: 1.75rem;
  box-shadow: 0 10px 30px rgba(2, 8, 23, 0.12);
}
.card h2 { margin-top: 0; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}
fieldset {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  margin: 0;
}
fieldset.full-width { grid-column: 1 / -1; }
legend {
  font-weight: 600;
  color: var(--primary);
  padding: 0 0.4rem;
  font-size: 0.9rem;
}
.field-hint {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
  margin-top: 0.1rem;
}
.field-hint strong { color: var(--text); }
label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.6rem;
}
input, select {
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.55rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  background: #fff;
  color: var(--text);
}
input:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}
button {
  cursor: pointer;
  border: none;
  border-radius: 10px;
  padding: 0.75rem 1.3rem;
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform 0.05s ease, background 0.15s ease;
}
button:active { transform: translateY(1px); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary {
  background: #e0f2fe;
  color: var(--primary-dark);
}
.btn-secondary:hover:not(:disabled) { background: #bae6fd; }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.error { color: #dc2626; font-size: 0.9rem; min-height: 1.2em; margin: 0.75rem 0 0; }

.hidden { display: none; }

/* --- Urlaubs-Übersicht --- */
.vacation-summary {
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  border-radius: 12px;
  padding: 0.9rem 1.1rem;
  margin-bottom: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  font-size: 0.9rem;
}
.vacation-summary strong { color: var(--text); }
.vacation-summary .vac-left { font-weight: 700; }
.vacation-summary .vac-over { color: #b91c1c; }

/* --- Ergebnisse --- */
.results { margin-top: 2rem; }
.results.hidden { display: none; }
.hint { color: var(--muted); font-size: 0.9rem; }

.month-card {
  background: var(--card);
  border-radius: 14px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 16px rgba(2, 8, 23, 0.08);
}
.month-head h3 { margin: 0 0 0.5rem; }
.month-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}
.month-meta strong { color: var(--text); }
.month-meta .warn { color: #b45309; font-weight: 600; }

/* --- Kalender-Ansicht --- */
.calendar {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 5px;
}
.cal-weekday {
  text-align: center;
  font-weight: 600;
  color: var(--muted);
  font-size: 0.75rem;
  padding: 4px 0;
}
.cal-cell {
  min-height: 64px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 5px 6px;
  background: #fff;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.cal-cell.empty { border: none; background: transparent; }
.cal-daynum {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--muted);
}
.cal-hours {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary-dark);
}
.cal-note {
  font-size: 0.66rem;
  color: var(--muted);
  line-height: 1.2;
}
.row-weekend { background: var(--weekend); }
.row-weekend .cal-daynum { color: #94a3b8; }
.row-holiday { background: var(--holiday); }
.row-sick { background: var(--sick); }
.row-sick .cal-hours { color: #b91c1c; }
.row-vacation { background: var(--vacation); }
.row-vacation .cal-hours { color: #047857; }

@media (max-width: 640px) {
  .cal-cell { min-height: 52px; padding: 3px; }
  .cal-hours { font-size: 0.85rem; }
  .cal-note { font-size: 0.6rem; }
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 2rem 1.5rem 3rem;
}
footer a, .back-link a {
  color: var(--primary);
  text-decoration: none;
}
footer a:hover, .back-link a:hover { text-decoration: underline; }
.gh-link {
  display: inline-flex;
  color: var(--muted);
  transition: color 0.15s ease, transform 0.05s ease;
}
.gh-link:hover { color: var(--text); }
.gh-link:active { transform: translateY(1px); }

/* --- Impressum --- */
.card article, article.card h2:first-of-type { margin-top: 0; }
article.card h2 { margin-top: 1.5rem; font-size: 1.1rem; }
article.card a { color: var(--primary); }
.back-link { margin-top: 2rem; font-weight: 600; }