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

:root {
  --color-bg: #0f1117;
  --color-surface: #1a1c25;
  --color-surface-hover: #22242f;
  --color-border: #2a2d3a;
  --color-border-hover: #3d4155;
  --color-text: #e4e4e8;
  --color-text-muted: #8b8d9a;
  --color-primary: #6c8cff;
  --color-primary-hover: #839dff;
  --color-primary-bg: rgba(108, 140, 255, 0.1);
  --color-accent: #4ade80;
  --color-danger: #f87171;
  --color-danger-bg: rgba(248, 113, 113, 0.1);
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

html {
  font-size: 16px;
}

body {
  font-family: 'Figtree', system-ui, -apple-system, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* === App Layout === */
.app {
  max-width: 960px;
  margin: 0 auto;
  padding: 48px 24px;
}

/* === Header === */
.header {
  text-align: center;
  margin-bottom: 40px;
}

.header__title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.header__subtitle {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-top: 4px;
  font-weight: 400;
}

/* === Sections === */
.section {
  animation: fadeIn 0.3s ease;
}

.section__title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.section__desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

/* === Home Cards === */
.home-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.home-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 40px 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  text-align: center;
  font-family: inherit;
  color: var(--color-text);
}

.home-card:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-bg);
}

.home-card__icon {
  color: var(--color-text-muted);
  transition: color 0.2s;
}

.home-card:hover .home-card__icon {
  color: var(--color-primary);
}

.home-card__title {
  font-size: 1.05rem;
  font-weight: 600;
}

.home-card__desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* === Upload Zone === */
.upload-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 56px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  background: var(--color-surface);
}

.upload-zone--small {
  padding: 32px 24px;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--color-primary);
  background: var(--color-primary-bg);
}

.upload-zone__icon {
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.upload-zone:hover .upload-zone__icon,
.upload-zone.dragover .upload-zone__icon {
  color: var(--color-primary);
}

.upload-zone__text {
  font-size: 1.05rem;
  font-weight: 500;
  margin-bottom: 6px;
}

.upload-zone__hint {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* === File Info === */
.file-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-top: 12px;
}

.file-info__name {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-primary);
}

.file-info__clear {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  transition: color 0.15s, background 0.15s;
}

.file-info__clear:hover {
  color: var(--color-danger);
  background: var(--color-danger-bg);
}

/* === Prefix Filter === */
.prefix-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.prefix-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 100px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  user-select: none;
  font-family: inherit;
  font-size: 0.875rem;
  color: var(--color-text);
}

.prefix-chip:hover {
  border-color: var(--color-border-hover);
  background: var(--color-surface-hover);
}

.prefix-chip.selected {
  border-color: var(--color-primary);
  background: var(--color-primary-bg);
}

.prefix-chip__check {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 2px solid var(--color-border-hover);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, border-color 0.15s;
  flex-shrink: 0;
}

.prefix-chip.selected .prefix-chip__check {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.prefix-chip__check svg {
  opacity: 0;
  transition: opacity 0.15s;
}

.prefix-chip.selected .prefix-chip__check svg {
  opacity: 1;
}

.prefix-chip__label {
  font-weight: 500;
}

.prefix-chip__count {
  color: var(--color-text-muted);
  font-weight: 400;
}

/* === Calendar === */
.calendar-toolbar {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.calendar {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  user-select: none;
}

.calendar__day-header {
  text-align: center;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  padding: 8px 0;
}

.calendar__day {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}

.calendar__day:hover {
  border-color: var(--color-border-hover);
  background: var(--color-surface-hover);
}

.calendar__day.exempt {
  border-color: var(--color-danger);
  background: var(--color-danger-bg);
  color: var(--color-danger);
  text-decoration: line-through;
}

.calendar__day.exempt:hover {
  background: rgba(248, 113, 113, 0.2);
}

.calendar__day.weekend {
  color: var(--color-text-muted);
}

.calendar__day.weekend.exempt {
  color: var(--color-danger);
}

.calendar__spacer {
  aspect-ratio: 1;
}

/* === Buttons === */
.btn {
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}

.btn--sm {
  padding: 8px 18px;
  font-size: 0.85rem;
}

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

.btn--primary:hover {
  background: var(--color-primary-hover);
}

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-hover);
}

.btn--danger {
  background: none;
  color: var(--color-danger);
  border: 1px solid transparent;
  padding: 6px 12px;
}

.btn--danger:hover {
  background: var(--color-danger-bg);
}

.btn--danger-outline {
  background: none;
  color: var(--color-danger);
  border: 1px solid var(--color-danger);
}

.btn--danger-outline:hover {
  background: var(--color-danger-bg);
}

.btn--danger-solid {
  background: var(--color-danger);
  color: #fff;
}

.btn--danger-solid:hover {
  background: #ef5350;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

/* === Custom Inputs === */
.custom-input {
  font-family: inherit;
  font-size: 0.9rem;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  outline: none;
  transition: border-color 0.15s;
  width: 100%;
}

.custom-input:focus {
  border-color: var(--color-primary);
}

.custom-input::placeholder {
  color: var(--color-text-muted);
}

.custom-input-group {
  flex: 1;
  min-width: 0;
}

/* Inline editable input inside table cells */
.inline-input {
  font-family: inherit;
  font-size: 0.9rem;
  padding: 4px 8px;
  border-radius: 4px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--color-text);
  outline: none;
  width: 100%;
  transition: border-color 0.15s, background 0.15s;
}

.inline-input:hover {
  border-color: var(--color-border);
  background: var(--color-surface-hover);
}

.inline-input:focus {
  border-color: var(--color-primary);
  background: var(--color-surface);
}

.inline-input::placeholder {
  color: var(--color-text-muted);
  font-style: italic;
}

/* === Add Employee Row === */
.add-employee-row {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 20px;
}

/* === Results === */
.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.results-header__actions {
  display: flex;
  gap: 10px;
}

.results-meta {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.table-wrapper {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table__th {
  text-align: left;
  padding: 12px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.table__th--num {
  width: 56px;
  text-align: center;
}

.table__th--days {
  width: 120px;
  text-align: center;
}

.table__th--company {
  width: 180px;
}

.table__th--action {
  width: 80px;
  text-align: center;
}

.table td {
  padding: 11px 16px;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--color-border);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

.table tbody tr:hover {
  background: var(--color-surface-hover);
}

.table .col-num {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

.table .col-days {
  text-align: center;
  font-weight: 600;
  color: var(--color-accent);
}

.table .col-action {
  text-align: center;
}

/* === Empty State === */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* === Modal === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.15s ease;
  backdrop-filter: blur(4px);
}

.modal {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  max-width: 420px;
  width: 90%;
  box-shadow: var(--shadow);
  animation: slideUp 0.2s ease;
}

.modal__title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.modal__message {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  line-height: 1.5;
}

.modal__actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* === Loading === */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 17, 23, 0.85);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1001;
  gap: 20px;
  backdrop-filter: blur(4px);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading-text {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

/* === Utilities === */
.hidden {
  display: none !important;
}

/* === Animations === */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* === Responsive === */
@media (max-width: 600px) {
  .app {
    padding: 24px 16px;
  }

  .header__title {
    font-size: 1.5rem;
  }

  .home-cards {
    grid-template-columns: 1fr;
  }

  .results-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .add-employee-row {
    flex-direction: column;
  }

  .table__th--days, .table .col-days {
    width: auto;
  }
}