:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --surface: #eef3f9;
  --border: #dfe7f1;
  --primary: #111827;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-soft: #dfeaff;
  --success: #16a34a;
  --success-soft: #dcfce7;
  --warning: #f59e0b;
  --warning-soft: #fef3c7;
  --danger: #dc2626;
  --danger-soft: #fee2e2;
  --shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg);
  color: var(--primary);
}

body {
  min-height: 100vh;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.hidden {
  display: none !important;
}

.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #eff6ff 0%, #f8fafc 100%);
  padding: 24px;
}

.auth-card {
  width: min(100%, 420px);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 28px;
}

.logo-block {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 22px;
}

.brand-mark {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 14px;
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 1.6rem;
}

.logo-block h1 {
  margin: 0;
  font-size: 1.5rem;
}

.logo-block p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

#loginForm,
.form-grid,
.salary-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

#loginForm {
  grid-template-columns: 1fr;
}

label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--primary);
  font-size: 0.92rem;
  font-weight: 600;
}

input,
select {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--primary);
  border-radius: 10px;
  padding: 12px 14px;
  outline: none;
  transition: 0.2s ease;
}

input:focus,
select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.primary-btn,
.secondary-btn,
.icon-button,
.nav-item {
  border: none;
  border-radius: 10px;
  transition: 0.2s ease;
}

.primary-btn,
.secondary-btn {
  padding: 11px 18px;
  font-weight: 600;
}

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

.primary-btn:hover {
  background: #1d4ed8;
}

.secondary-btn {
  background: #f1f5f9;
  color: var(--primary);
  border: 1px solid var(--border);
}

.secondary-btn:hover {
  background: #e2e8f0;
}

.full-width {
  width: 100%;
}

.message-box {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 10px;
  font-size: 0.92rem;
}

.message-box.error {
  background: var(--danger-soft);
  color: var(--danger);
  border: 1px solid #fecaca;
}

.message-box.success {
  background: var(--success-soft);
  color: var(--success);
  border: 1px solid #bbf7d0;
}

.app-shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  background: #0f172a;
  color: #e2e8f0;
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand-box {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 10px 16px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.25);
}

.brand-box .brand-mark {
  width: 40px;
  height: 40px;
  font-size: 1.2rem;
}

.brand-box strong,
.brand-box small {
  display: block;
}

.brand-box small {
  color: #94a3b8;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-item {
  width: 100%;
  background: transparent;
  color: #dfe7f1;
  text-align: left;
  padding: 12px 12px;
  font-weight: 600;
}

.nav-item:hover,
.nav-item.active {
  background: rgba(255, 255, 255, 0.08);
  border-left: 3px solid #fff;
  padding-left: 9px;
}

#logoutBtn {
  margin-top: auto;
  background: rgba(255,255,255,0.06);
  color: white;
  border: 1px solid rgba(148, 163, 184, 0.25);
}

.main-panel {
  flex: 1;
  padding: 24px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
  background: rgba(255,255,255,0.6);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px 22px;
}

.topbar h2 {
  margin: 0;
}

.topbar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-weight: 600;
}

.page-section {
  display: none;
}

.page-section.active {
  display: block;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 22px;
}

.stat-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow);
}

.stat-card span {
  color: var(--muted);
  font-size: 0.9rem;
}

.stat-card strong {
  font-size: clamp(1.5rem, 2vw, 2rem);
}

.stat-card.accent {
  background: linear-gradient(135deg, #eff6ff, #fff);
}

.stat-card.success {
  background: linear-gradient(135deg, #ecfdf5, #fff);
}

.stat-card.warning {
  background: linear-gradient(135deg, #fff7ed, #fff);
}

.stat-card.danger {
  background: linear-gradient(135deg, #fef2f2, #fff);
}

.stat-card.neutral {
  background: linear-gradient(135deg, #f8fafc, #fff);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 22px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.panel-head h3 {
  margin: 0;
  font-size: 1.15rem;
}

.space-between {
  justify-content: space-between;
}

.toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.toolbar input,
.toolbar select {
  min-width: 160px;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}

th, td {
  text-align: left;
  border-bottom: 1px solid var(--border);
  padding: 12px 10px;
  vertical-align: middle;
}

th {
  background: #f8fafc;
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

tbody tr:hover {
  background: #f8fbff;
}

.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
  background: #e2e8f0;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 5px 8px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
}

.badge.active {
  background: var(--success-soft);
  color: var(--success);
}

.badge.inactive {
  background: var(--danger-soft);
  color: var(--danger);
}

.badge.present,
.badge.late {
  background: var(--warning-soft);
  color: var(--warning);
}

.badge.absent {
  background: var(--danger-soft);
  color: var(--danger);
}

.action-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.table-action {
  background: #eff6ff;
  color: var(--accent);
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 0.8rem;
}

.form-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

.span-2 {
  grid-column: span 2;
}

.list-block {
  margin-top: 22px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 16px;
}

.summary-item {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
}

.summary-item span {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
}

.summary-item strong {
  display: block;
  margin-top: 8px;
  font-size: 1.1rem;
}

.salary-summary {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 16px;
}

.salary-summary .summary-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #f8fafc;
}

.mobile-only {
  display: none;
}

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

  .sidebar {
    position: fixed;
    left: -280px;
    z-index: 30;
    transition: left 0.25s ease;
  }

  .sidebar.open {
    left: 0;
  }

  .mobile-only {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: #f1f5f9;
    border: 1px solid var(--border);
    color: var(--primary);
  }

  .main-panel {
    padding: 16px;
  }
}

@media (max-width: 720px) {
  .stats-grid,
  .summary-grid,
  .salary-summary,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .span-2 {
    grid-column: span 1;
  }

  .panel,
  .topbar {
    padding: 16px;
  }
}