/* CSS Reset and Variables */
:root {
  --primary: #0078d4;
  --primary-dark: #005a9e;
  --success: #107c10;
  --danger: #d13438;
  --warning: #ffb900;
  --gray-50: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--gray-900);
  background: var(--gray-100);
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: white;
  z-index: 1000;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Login Screen */
.login-screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.login-card {
  background: white;
  padding: 3rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  text-align: center;
  max-width: 400px;
}

.login-card h1 {
  margin-bottom: 0.5rem;
  color: var(--gray-800);
}

.login-card p {
  margin-bottom: 1.5rem;
  color: var(--gray-500);
}

/* App Container */
.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: white;
  border-bottom: 1px solid var(--gray-200);
  box-shadow: var(--shadow);
}

.header-left h1 {
  font-size: 1.25rem;
  font-weight: 600;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.user-name {
  color: var(--gray-600);
}

/* Error Banner */
.error-banner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background: #fef2f2;
  border-bottom: 1px solid #fecaca;
  color: var(--danger);
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0;
  padding: 0 1.5rem;
  background: white;
  border-bottom: 1px solid var(--gray-200);
  overflow-x: auto;
}

.tabs button {
  padding: 0.75rem 1.25rem;
  border: none;
  background: none;
  font-size: 14px;
  color: var(--gray-600);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  position: relative;
}

.tabs button:hover {
  color: var(--gray-900);
}

.tabs button.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tabs .badge {
  position: absolute;
  top: 4px;
  right: 4px;
  background: var(--danger);
  color: white;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 10px;
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.tab-content {
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.tab-content h2 {
  margin-bottom: 1rem;
  font-size: 1.25rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

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

.btn-success {
  background: var(--success);
  color: white;
}

.btn-success:hover {
  background: #0b5e0b;
}

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

.btn-danger:hover {
  background: #a52a2d;
}

.btn-ghost {
  background: transparent;
  color: var(--gray-600);
}

.btn-ghost:hover {
  background: var(--gray-100);
  color: var(--gray-900);
}

.btn-small {
  padding: 0.35rem 0.75rem;
  font-size: 12px;
}

.btn-large {
  padding: 0.75rem 1.5rem;
  font-size: 16px;
}

.btn-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--gray-400);
  cursor: pointer;
  line-height: 1;
}

.btn-close:hover {
  color: var(--gray-600);
}

.btn-icon {
  background: none;
  border: 1px solid var(--gray-300);
  border-radius: 4px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  color: var(--gray-600);
}

.btn-icon:hover:not(:disabled) {
  background: var(--gray-100);
}

.btn-icon:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.btn-danger-icon {
  color: var(--danger);
  border-color: var(--danger);
}

/* Current On-Call Cards */
.oncall-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.oncall-card {
  background: white;
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.oncall-card .rotation-name {
  font-size: 12px;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.oncall-card .oncall-person {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.oncall-card .oncall-email {
  color: var(--gray-500);
  font-size: 13px;
}

/* Schedule */
.schedule-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.rotation-select {
  padding: 0.5rem 1rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 14px;
  min-width: 200px;
}

.schedule-members {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding: 1rem;
  background: var(--gray-50);
  border-radius: var(--radius);
}

.member-chip {
  background: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 13px;
  border: 1px solid var(--gray-200);
}

.member-chip-small {
  background: var(--gray-100);
  padding: 0.15rem 0.5rem;
  border-radius: 10px;
  font-size: 11px;
}

.schedule-table {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

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

.schedule-table th,
.schedule-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

.schedule-table th {
  background: var(--gray-50);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  color: var(--gray-600);
}

.schedule-table td small {
  display: block;
  color: var(--gray-500);
  font-size: 12px;
}

.schedule-table tr.current-week {
  background: #eff6ff;
}

.schedule-table tr.past-week {
  opacity: 0.5;
}

/* Badges */
.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
}

.badge-current {
  background: var(--primary);
  color: white;
}

.badge-override {
  background: var(--warning);
  color: var(--gray-800);
}

.badge-swap {
  background: #e0e7ff;
  color: #4338ca;
}

.badge-pending {
  background: var(--warning);
  color: var(--gray-800);
}

.badge-approved {
  background: var(--success);
  color: white;
}

.badge-rejected {
  background: var(--danger);
  color: white;
}

.badge-cancelled {
  background: var(--gray-400);
  color: white;
}

.badge-inactive {
  background: var(--gray-300);
  color: var(--gray-600);
}

/* My Shifts */
.shifts-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.calendar-subscription {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.calendar-url-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.calendar-url {
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 12px;
  width: 250px;
  background: var(--gray-50);
}

.shifts-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.shift-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.shift-card.current-week {
  border-left: 3px solid var(--primary);
}

.shift-card.past-week {
  opacity: 0.5;
}

.shift-rotation {
  font-weight: 600;
}

.shift-date {
  color: var(--gray-500);
  font-size: 13px;
}

.shift-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Swaps */
.swap-section {
  margin-bottom: 2rem;
}

.swap-section h3 {
  margin-bottom: 0.75rem;
  font-size: 1rem;
  color: var(--gray-700);
}

.swaps-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.swap-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border-left: 3px solid transparent;
}

.swap-card.swap-pending {
  border-left-color: var(--warning);
}

.swap-card.swap-approved {
  border-left-color: var(--success);
}

.swap-card.swap-rejected {
  border-left-color: var(--danger);
}

.swap-rotation {
  font-weight: 600;
}

.swap-date {
  color: var(--gray-500);
  font-size: 13px;
}

.swap-users {
  font-size: 13px;
  margin-top: 0.25rem;
}

.swap-arrow {
  color: var(--gray-400);
  margin: 0 0.5rem;
}

.swap-reason {
  font-size: 12px;
  color: var(--gray-500);
  margin-top: 0.25rem;
}

.swap-actions {
  display: flex;
  gap: 0.5rem;
}

/* Admin */
.admin-section {
  background: white;
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
}

.admin-section h3 {
  margin-bottom: 1rem;
  font-size: 1rem;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.admin-rotations {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.rotation-card {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 1rem;
  background: var(--gray-50);
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
}

.rotation-card.inactive {
  opacity: 0.6;
}

.rotation-info .rotation-name {
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.rotation-start {
  font-size: 13px;
  color: var(--gray-500);
  margin-top: 0.25rem;
}

.rotation-members-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-top: 0.5rem;
}

.rotation-actions {
  display: flex;
  gap: 0.5rem;
}

/* Notification Form */
.notification-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

/* Forms */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.form-group label {
  font-weight: 500;
  font-size: 13px;
  color: var(--gray-700);
}

.form-input {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 14px;
  width: 100%;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(0, 120, 212, 0.1);
}

textarea.form-input {
  min-height: 80px;
  resize: vertical;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

/* Members List (in rotation modal) */
.members-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.member-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem;
  background: var(--gray-50);
  border-radius: var(--radius);
}

.member-position {
  font-weight: 600;
  color: var(--gray-500);
  min-width: 24px;
}

.member-email {
  flex: 1;
}

.member-controls {
  display: flex;
  gap: 0.25rem;
}

.add-member-row {
  display: flex;
  gap: 0.5rem;
}

.add-member-row input {
  flex: 1;
}

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 450px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
}

.modal-large {
  max-width: 600px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--gray-200);
}

.modal-header h3 {
  font-size: 1rem;
}

.modal-body {
  padding: 1.25rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--gray-200);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--gray-500);
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .header-right {
    width: 100%;
    justify-content: space-between;
  }

  .tabs {
    padding: 0;
  }

  .tabs button {
    padding: 0.75rem 1rem;
    font-size: 13px;
  }

  .main-content {
    padding: 1rem;
  }

  .schedule-header,
  .shifts-header {
    flex-direction: column;
    align-items: stretch;
  }

  .rotation-select {
    width: 100%;
  }

  .calendar-subscription {
    flex-wrap: wrap;
  }

  .calendar-url-container {
    flex-wrap: wrap;
    width: 100%;
  }

  .calendar-url {
    width: 100%;
  }

  .shift-card,
  .swap-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .shift-actions,
  .swap-actions {
    width: 100%;
    justify-content: flex-end;
  }

  .rotation-card {
    flex-direction: column;
    gap: 0.75rem;
  }

  .rotation-actions {
    width: 100%;
    justify-content: flex-end;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .section-header {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }
}

/* Touch-friendly inputs */
@media (pointer: coarse) {
  .btn,
  .form-input,
  .rotation-select {
    min-height: 44px;
  }

  .btn-small {
    min-height: 36px;
  }

  input[type="checkbox"] {
    width: 20px;
    height: 20px;
  }
}