:root {
  color-scheme: dark;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f4f6f8;
  color: #1e293b;
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-strong: #e2e8f0;
  --text: #102a43;
  --muted: #64748b;
  --primary: #1e3a8a;
  --primary-soft: #c7d2fe;
  --accent: #0f766e;
  --accent-soft: #d9f99d;
  --danger: #b91c1c;
  --warning: #f97316;
  --shadow: 0 22px 45px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(180deg, #eef2ff 0%, #f8fafc 100%);
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  display: none;
  max-width: 1300px;
  margin: 24px auto;
  padding: 0 18px 32px;
}

.topbar {
  display: grid;
  gap: 18px;
  background: #ffffff;
  padding: 28px 32px;
  border-radius: 24px;
  box-shadow: var(--shadow);
  border: 1px solid #dbeafe;
}

.topbar h1 {
  margin: 0;
  font-size: 2rem;
  letter-spacing: -0.02em;
}

.topbar p {
  margin: 8px 0 0;
  color: var(--muted);
}

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

.topbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
  align-items: center;
}

.topbar-actions .button-secondary {
  padding: 10px 14px;
}

.tab-button {
  border: 1px solid #cbd5e1;
  background: #ffffff;
  color: var(--text);
  padding: 12px 18px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-button:hover,
.tab-button.active {
  border-color: var(--primary);
  background: var(--primary);
  color: #ffffff;
}

main {
  display: grid;
  gap: 24px;
  margin-top: 24px;
}

.panel {
  display: none;
  gap: 24px;
}

.panel.active {
  display: grid;
}

.panel-heading {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
}

.panel-heading h2 {
  margin: 0;
  font-size: 1.4rem;
}

.panel-heading p {
  margin: 8px 0 0;
  color: var(--muted);
}

.select-wrap {
  display: grid;
  gap: 8px;
  min-width: 220px;
}

.select-wrap label,
.form-row label {
  font-size: 0.95rem;
  color: var(--muted);
}

select,
input[type="text"],
input[type="date"],
input[type="time"],
input[type="tel"] {
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid #cbd5e1;
  background: #ffffff;
  color: var(--text);
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.card {
  background: var(--surface);
  border-radius: 20px;
  padding: 24px;
  border: 1px solid #e2e8f0;
  box-shadow: 0 12px 30px rgba(148, 163, 184, 0.08);
}

.card-kpi {
  display: grid;
  gap: 8px;
}

.card-kpi span {
  color: var(--muted);
  font-size: 0.95rem;
}

.card-kpi strong {
  font-size: 2.15rem;
  color: var(--text);
}

.accent-blue {
  background: #eef2ff;
  border-color: #c7d2fe;
}

.accent-orange {
  background: #fff7ed;
  border-color: #fed7aa;
}

.accent-red {
  background: #fef2f2;
  border-color: #fecaca;
}

.table-card,
.form-card {
  background: var(--surface);
  border-radius: 24px;
  padding: 24px;
  border: 1px solid #e2e8f0;
  box-shadow: var(--shadow);
}

.table-header {
  margin-bottom: 18px;
}

.table-header h3 {
  margin: 0;
}

.table-scroll {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

thead th {
  text-align: left;
  font-weight: 600;
  color: #0f172a;
  padding: 14px 16px;
  background: #1e293b;
  color: #ffffff;
  border-bottom: 2px solid #cbd5e1;
}

tbody tr {
  border-bottom: 1px solid #e2e8f0;
}

tbody td {
  padding: 14px 16px;
  vertical-align: middle;
  color: #334155;
}

button {
  border: none;
  border-radius: 12px;
  padding: 12px 18px;
  cursor: pointer;
}

.button-primary {
  background: var(--primary);
  color: #fff;
}

.button-secondary {
  background: #e2e8f0;
  color: var(--text);
}

button:hover {
  opacity: 0.97;
}

.login-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: linear-gradient(180deg, #eef2ff 0%, #f8fafc 100%);
}

.login-card {
  width: min(460px, 100%);
  background: #ffffff;
  border-radius: 28px;
  padding: 32px;
  box-shadow: var(--shadow);
  border: 1px solid #e2e8f0;
}

.login-card h1 {
  margin: 0 0 10px;
  font-size: 1.8rem;
}

.login-card p {
  margin: 0 0 22px;
  color: var(--muted);
}

.login-error {
  margin: 0;
  color: var(--danger);
  font-size: 0.95rem;
}

.form-row {
  display: grid;
  gap: 8px;
}

.form-row.full-width {
  grid-column: 1 / -1;
}

form {
  display: grid;
  gap: 18px;
}

.form-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hidden {
  display: none !important;
}

.status-chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
}

.status-present { background: #dcfce7; color: #166534; }
.status-absent { background: #fee2e2; color: #991b1b; }
.status-late { background: #ffedd5; color: #b45309; }
.status-leave { background: #e0f2fe; color: #0369a1; }

.action-button {
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid #cbd5e1;
  background: #ffffff;
  color: #0f172a;
}

.action-button.delete {
  border-color: #fca5a5;
  background: #fff1f2;
  color: #b91c1c;
}

@media (max-width: 980px) {
  .kpi-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .topbar,
  .table-card,
  .form-card {
    padding: 20px;
  }
  .panel-heading {
    flex-direction: column;
    align-items: flex-start;
  }
  .table-scroll table {
    min-width: 620px;
  }
}