:root {
  --primary-red: #B42318;
  --primary-black: #101114;
  --accent-blue: #1B4F72;
  --accent-blue-light: #256B9A;
  --background-light: #F4F6F8;
  --surface: #FFFFFF;
  --surface-muted: #F8FAFC;
  --border: #D8DEE6;
  --border-strong: #A9B4C2;
  --text-primary: #14171A;
  --text-secondary: #52606D;
  --focus-ring: #F2B705;
  --status-present: #218A4B;
  --status-late: #D99A00;
  --status-absent: #C92A2A;
  --status-incomplete: #0B7285;
  --status-late-incomplete: #6F42C1;
  --status-leave: #6F42C1;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --shadow-sm: 0 0.25rem 0.75rem rgba(26, 26, 26, 0.08);
  --shadow-md: 0 0.75rem 1.75rem rgba(16, 17, 20, 0.12);
  --font-family-base: "Inter", Arial, sans-serif;
  --content-max-width: 88rem;
  --header-height: 4.75rem;
}

/* ============================================
   BASE STYLES - document defaults
   ============================================ */
* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--background-light);
  color: var(--text-primary);
  font-family: var(--font-family-base);
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select {
  font: inherit;
}

img {
  display: block;
  max-width: 100%;
}

/* ============================================
   LAYOUT - main page frame
   ============================================ */
.app-shell {
  min-height: 100vh;
}

.main-content {
  width: min(100%, var(--content-max-width));
  margin: 0 auto;
  padding: var(--space-5);
}

.dashboard {
  display: grid;
  gap: var(--space-5);
}

/* ============================================
   HEADER - brand and actions
   ============================================ */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100; /* Keep navigation available above scrollable dashboard sections */
  display: flex;
  min-height: var(--header-height);
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  background: var(--primary-black);
  color: var(--surface);
  box-shadow: var(--shadow-sm);
}

.brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: var(--space-3);
}

.brand__logo-wrap {
  display: grid;
  width: 2.75rem;
  height: 2.75rem;
  flex: 0 0 auto;
  place-items: center;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.brand__logo {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.brand__text {
  display: grid;
  min-width: 0;
}

.brand__name {
  overflow: hidden;
  font-size: 1.1rem;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand__tagline {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.82rem;
}

.header-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
}

.live-clock {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.9rem;
}

/* ============================================
   UPLOAD AREA - initial empty state
   ============================================ */
.upload-panel {
  display: grid;
  min-height: 24rem;
  place-items: center;
  gap: var(--space-4);
  padding: var(--space-6);
  border: 2px dashed var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  text-align: center;
  transition: border-color 0.2s ease, background-color 0.2s ease; /* Highlight drop readiness without shifting layout */
}

.upload-panel.is-dragging {
  border-color: var(--accent-blue);
  background: rgba(30, 58, 95, 0.06);
}

.upload-panel__icon {
  display: grid;
  width: 4rem;
  height: 4rem;
  place-items: center;
  border-radius: 50%;
  background: rgba(30, 58, 95, 0.1);
  color: var(--accent-blue);
}

.upload-panel__copy h1 {
  margin: 0 0 var(--space-2);
  font-size: 1.75rem;
}

.upload-panel__copy p {
  margin: 0;
  color: var(--text-secondary);
}

.upload-panel__hint {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.upload-button,
.primary-action,
.secondary-action {
  display: inline-flex;
  min-height: 2.75rem;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0 var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 700;
  line-height: 1.1;
  text-align: center;
  transition: background-color 0.2s ease, border-color 0.2s ease; /* Smooth state change without layout shift */
}

.upload-button {
  background: var(--primary-red);
  color: var(--surface);
}

.primary-action {
  background: var(--accent-blue);
  color: var(--surface);
}

.secondary-action {
  border-color: var(--border);
  background: var(--surface);
  color: var(--text-primary);
}

.upload-button:hover,
.primary-action:hover {
  background: var(--accent-blue-light);
}

.secondary-action:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

/* ============================================
   FILE FEEDBACK - parsed upload metadata
   ============================================ */
.file-feedback {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.file-feedback__label {
  display: block;
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

/* ============================================
   SUMMARY CARDS - top row stat blocks
   ============================================ */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4);
}

.summary-card {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-left: 0.35rem solid var(--accent-blue);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.summary-card--present {
  border-left-color: var(--status-present);
}

.summary-card--late {
  border-left-color: var(--status-late);
}

.summary-card--absent {
  border-left-color: var(--status-absent);
}

.summary-card__label {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
}

.summary-card__value {
  font-size: 2rem;
  line-height: 1;
}

.summary-card__meta {
  color: var(--text-secondary);
  font-size: 0.78rem;
}

/* ============================================
   FILTERS - sticky control row
   ============================================ */
.filter-bar {
  position: sticky;
  top: var(--header-height);
  z-index: 90; /* Keep filters visible while table content scrolls underneath */
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: var(--space-3);
  align-items: end;
  padding: var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.filter-placeholder {
  color: var(--text-secondary);
}

.filter-field {
  display: grid;
  gap: var(--space-1);
}

.filter-field label {
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.filter-field select,
.filter-field input {
  min-height: 2.75rem;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--text-primary);
  padding: 0 var(--space-3);
}

.filter-field select:focus,
.filter-field input:focus {
  border-color: var(--accent-blue);
}

.filter-field select:disabled,
.filter-field input:disabled,
.secondary-action:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

/* ============================================
   CHARTS - responsive visualization panels
   ============================================ */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
}

.panel {
  padding: var(--space-5);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.panel h2 {
  margin: 0 0 var(--space-4);
  font-size: 1.1rem;
}

.panel__placeholder {
  display: grid;
  min-height: 12rem;
  place-items: center;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

.chart-frame {
  position: relative;
  min-height: 18rem;
}

.chart-frame canvas {
  width: 100%;
  min-height: 18rem;
}

.chart-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-secondary);
  text-align: center;
}

/* ============================================
   CALENDAR - monthly attendance area
   ============================================ */
.calendar-panel {
  display: grid;
  gap: var(--space-4);
  min-height: 18rem;
}

.calendar-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.calendar-header h2 {
  margin: 0;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: var(--space-2);
}

.calendar-weekday {
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 700;
  text-align: center;
  text-transform: uppercase;
}

.calendar-cell {
  min-height: 6.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  padding: var(--space-2);
  text-align: left;
  overflow-wrap: anywhere;
}

.calendar-cell--empty {
  background: var(--background-light);
}

.calendar-cell--active {
  cursor: pointer;
}

.calendar-cell--selected {
  border-color: var(--accent-blue);
  box-shadow: inset 0 0 0 1px var(--accent-blue);
}

.calendar-cell__date {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: 700;
}

.calendar-status-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.calendar-status-dot {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--border);
}

.calendar-status-dot--present {
  background: var(--status-present);
}

.calendar-status-dot--late {
  background: var(--status-late);
}

.calendar-status-dot--absent {
  background: var(--status-absent);
}

.calendar-status-dot--incomplete {
  background: var(--status-incomplete);
}

.calendar-status-dot--late-incomplete {
  background: var(--status-late-incomplete);
}

.calendar-detail {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: rgba(30, 58, 95, 0.05);
  padding: var(--space-4);
}

.calendar-detail p {
  margin: 0;
  color: var(--text-secondary);
}

.calendar-detail__list {
  display: grid;
  gap: var(--space-2);
  margin: var(--space-3) 0 0;
  padding: 0;
  list-style: none;
}

.calendar-detail__item {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

/* ============================================
   TABLE - employee detail rows
   ============================================ */
.table-panel__header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.table-panel__header h2 {
  margin: 0;
}

.table-panel__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
}

.table-panel__meta {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
}

.table-scroll {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow-x: auto;
  scrollbar-color: var(--border-strong) var(--surface-muted);
}

table {
  width: 100%;
  min-width: 52rem;
  border-collapse: collapse;
}

th,
td {
  padding: var(--space-3);
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface-muted);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.table-sort {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 0;
  text-align: left;
  text-transform: inherit;
}

.table-sort::after {
  content: "";
  color: var(--accent-blue);
  font-size: 0.75rem;
}

.table-sort.is-active[data-sort-direction="asc"]::after {
  content: "^";
}

.table-sort.is-active[data-sort-direction="desc"]::after {
  content: "v";
}

.table-row-toggle {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  gap: var(--space-2);
  border: 0;
  background: transparent;
  color: var(--accent-blue);
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 0;
  text-align: left;
  overflow-wrap: anywhere;
}

.status-badge {
  display: inline-flex;
  min-width: 6rem;
  justify-content: center;
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-2);
  color: var(--surface);
  font-size: 0.78rem;
  font-weight: 700;
}

.status-badge--present {
  background: var(--status-present);
}

.status-badge--late {
  background: var(--status-late);
  color: var(--text-primary);
}

.status-badge--absent {
  background: var(--status-absent);
}

.status-badge--incomplete {
  background: var(--status-incomplete);
}

.status-badge--late-incomplete {
  background: var(--status-late-incomplete);
}

.table-details-row td {
  background: rgba(30, 58, 95, 0.05);
}

.swipe-details {
  display: grid;
  gap: var(--space-2);
  color: var(--text-secondary);
}

.swipe-details__list {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.swipe-details__item {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.table-empty {
  color: var(--text-secondary);
  text-align: center;
}

.table-pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  padding-top: var(--space-4);
  color: var(--text-secondary);
}

/* ============================================
   UTILITIES - reusable helpers
   ============================================ */
.state-message {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.state-message--loading {
  color: var(--accent-blue);
}

.state-message--error {
  color: var(--status-absent);
}

.app-message {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.app-message--info {
  border-color: rgba(27, 79, 114, 0.35);
  background: rgba(27, 79, 114, 0.06);
  color: var(--accent-blue);
}

.app-message--warning {
  border-color: rgba(217, 154, 0, 0.4);
  background: rgba(217, 154, 0, 0.08);
  color: #6F4E00;
}

.app-message--error {
  border-color: rgba(201, 42, 42, 0.35);
  background: rgba(201, 42, 42, 0.07);
  color: var(--status-absent);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 0.2rem solid var(--focus-ring);
  outline-offset: 0.2rem;
}

/* ============================================
   RESPONSIVE RULES - tablet and mobile layouts
   ============================================ */
@media (max-width: 64rem) {
  .summary-grid,
  .dashboard-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .filter-bar {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .chart-frame,
  .chart-frame canvas {
    min-height: 16rem;
  }
}

@media (max-width: 48rem) {
  .app-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .header-actions {
    width: 100%;
    justify-content: flex-start;
  }

  .main-content {
    padding: var(--space-4);
  }

  .summary-grid,
  .dashboard-grid {
    grid-template-columns: 1fr;
  }

  .filter-bar {
    top: 0;
    grid-template-columns: 1fr;
  }

  .calendar-grid {
    gap: var(--space-1);
  }

  .calendar-cell {
    min-height: 4.75rem;
    padding: var(--space-1);
  }

  .calendar-status-dot {
    width: 0.6rem;
    height: 0.6rem;
  }

  .table-panel__actions,
  .table-pagination {
    width: 100%;
    justify-content: flex-start;
  }

  .upload-button,
  .primary-action,
  .secondary-action {
    min-height: 2.5rem;
  }
}

@media (max-width: 34rem) {
  .brand__tagline,
  .live-clock {
    font-size: 0.78rem;
  }

  .upload-panel {
    min-height: 18rem;
    padding: var(--space-4);
  }

  .upload-panel__copy h1 {
    font-size: 1.35rem;
  }

  .summary-card__value {
    font-size: 1.65rem;
  }

  .calendar-weekday {
    font-size: 0.66rem;
  }

  .calendar-cell {
    min-height: 4rem;
  }

  .calendar-cell__date {
    margin-bottom: var(--space-1);
  }
}