/* ── Reset & base ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f8fafc;
  color: #1e293b;
  min-height: 100vh;
}

/* ── Header ───────────────────────────────────────────── */
header {
  background: #fff;
  border-bottom: 1px solid #e2e8f0;
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
header h1 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #1e293b;
}
.header-actions { display: flex; gap: 0.5rem; }

/* ── Main ─────────────────────────────────────────────── */
main {
  max-width: 960px;
  margin: 1.5rem auto;
  padding: 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* ── Buttons ──────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-primary { background: #6366f1; color: #fff; }
.btn-primary:hover { background: #4f46e5; }
.btn-ghost { background: transparent; color: #64748b; border: 1px solid #e2e8f0; }
.btn-ghost:hover { background: #f1f5f9; }
.btn-danger { background: #fee2e2; color: #dc2626; }
.btn-danger:hover { background: #fecaca; }
.btn-sm { padding: 0.25rem 0.6rem; font-size: 0.8rem; }
.btn-lg { padding: 0.6rem 1.4rem; font-size: 0.95rem; }

/* ── Toolbar ──────────────────────────────────────────── */
.toolbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.year-form { display: flex; align-items: center; gap: 0.5rem; }
.year-form label { font-size: 0.85rem; color: #64748b; font-weight: 500; }
.year-form select {
  padding: 0.3rem 0.6rem;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  font-size: 0.9rem;
  background: #fff;
  cursor: pointer;
}

.stat-chips { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.stat-chip {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 0.5rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 110px;
}
.chip-label { font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.chip-avg { font-size: 1.4rem; font-weight: 700; line-height: 1.2; }
.chip-sub { font-size: 0.72rem; color: #94a3b8; }

.stat-wed .chip-label { color: #6366f1; }
.stat-wed .chip-avg   { color: #4f46e5; }
.stat-sun_am .chip-label { color: #10b981; }
.stat-sun_am .chip-avg   { color: #059669; }
.stat-sun_pm .chip-label { color: #f59e0b; }
.stat-sun_pm .chip-avg   { color: #d97706; }

/* ── Chart card ───────────────────────────────────────── */
.chart-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 1.25rem;
}
#attendanceChart { max-height: 320px; }

/* ── Table card ───────────────────────────────────────── */
.table-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 1.25rem;
}
.table-card h2 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #475569;
}
table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
th {
  text-align: left;
  padding: 0.5rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid #f1f5f9;
}
td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid #f8fafc;
  vertical-align: middle;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: #f8fafc; }
td.count { font-weight: 700; font-size: 1rem; }
td.note { color: #64748b; font-style: italic; max-width: 280px; }
td.actions { display: flex; gap: 0.4rem; white-space: nowrap; }

.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 600;
}
.badge-wed    { background: #ede9fe; color: #6366f1; }
.badge-sun_am { background: #d1fae5; color: #059669; }
.badge-sun_pm { background: #fef3c7; color: #d97706; }

.empty { color: #94a3b8; font-size: 0.9rem; padding: 1rem 0; }
.empty a { color: #6366f1; }

/* ── Form card ────────────────────────────────────────── */
.form-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 2rem;
  max-width: 480px;
}

.field { display: flex; flex-direction: column; gap: 0.4rem; margin-bottom: 1.25rem; }
.field label { font-size: 0.88rem; font-weight: 600; color: #374151; }
.optional { font-weight: 400; color: #94a3b8; }

input[type="date"],
input[type="number"],
input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  font-size: 0.95rem;
  transition: border-color 0.15s;
  background: #fff;
}
input:focus { outline: none; border-color: #6366f1; box-shadow: 0 0 0 3px rgba(99,102,241,0.1); }

.radio-group { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 0.25rem; }
.radio-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 500;
  transition: all 0.15s;
  user-select: none;
}
.radio-label input[type="radio"] { display: none; }
.radio-label:has(input:checked) { border-width: 2px; }
.radio-wed:has(input:checked)    { border-color: #6366f1; background: #ede9fe; color: #4f46e5; }
.radio-sun_am:has(input:checked) { border-color: #10b981; background: #d1fae5; color: #059669; }
.radio-sun_pm:has(input:checked) { border-color: #f59e0b; background: #fef3c7; color: #d97706; }

.form-actions { display: flex; gap: 0.75rem; margin-top: 1.75rem; }

/* ── Error ────────────────────────────────────────────── */
.error {
  background: #fee2e2;
  color: #dc2626;
  padding: 0.6rem 0.9rem;
  border-radius: 6px;
  font-size: 0.88rem;
  margin-bottom: 1rem;
}

/* ── Login ────────────────────────────────────────────── */
.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: #f8fafc;
}
.login-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 2.5rem;
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.login-card h1 { font-size: 1.3rem; font-weight: 700; text-align: center; }
.login-card label { font-size: 0.88rem; font-weight: 600; display: block; margin-bottom: 0.4rem; }
.login-card button {
  width: 100%;
  padding: 0.65rem;
  background: #6366f1;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 0.25rem;
}
.login-card button:hover { background: #4f46e5; }

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 600px) {
  main { padding: 0 1rem; margin: 1rem auto; }
  .toolbar { flex-direction: column; align-items: flex-start; }
  .stat-chips { gap: 0.5rem; }
  .stat-chip { min-width: 90px; }
  td.note { display: none; }
  .form-card { padding: 1.25rem; }
}