/* CSS Variables */
:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --success: #22c55e;
  --success-dark: #16a34a;
  --warning: #f59e0b;
  --warning-dark: #d97706;
  --danger: #ef4444;
  --danger-dark: #dc2626;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --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);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--gray-100);
  color: var(--gray-800);
  line-height: 1.5;
  min-height: 100vh;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Navbar */
.navbar {
  background: white;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand a {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-800);
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-user {
  color: var(--gray-500);
  font-size: 0.875rem;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}

.btn:hover {
  text-decoration: none;
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
}

.btn-block {
  width: 100%;
}

.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: var(--success-dark);
}

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

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

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

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

.btn-outline {
  background: transparent;
  border: 1px solid var(--gray-300);
  color: var(--gray-700);
}

.btn-outline:hover {
  background: var(--gray-100);
  border-color: var(--gray-400);
}

/* Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.375rem;
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--gray-700);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: 1rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group small {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.75rem;
  color: var(--gray-500);
}

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

.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* Alerts */
.alert {
  padding: 0.875rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-size: 0.875rem;
}

.alert-error {
  background: #fef2f2;
  color: var(--danger);
  border: 1px solid #fecaca;
}

/* Auth Pages */
.auth-container {
  min-height: calc(100vh - 4rem);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.auth-card {
  background: white;
  padding: 2.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 400px;
}

.auth-card h1 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.auth-subtitle {
  color: var(--gray-500);
  margin-bottom: 1.5rem;
}

.auth-form {
  margin-bottom: 1.5rem;
}

.auth-footer {
  text-align: center;
  font-size: 0.875rem;
  color: var(--gray-500);
}

/* Dashboard */
.dashboard {
  padding-bottom: 2rem;
}

.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.dashboard-header h1 {
  font-size: 1.75rem;
}

.dashboard-actions {
  display: flex;
  gap: 0.75rem;
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

/* Project Card */
.project-card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  position: relative;
}

.project-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.project-card.dragging {
  opacity: 0.5;
  transform: scale(1.02);
}

.project-card.drag-over {
  border: 2px dashed var(--primary);
}

.project-color-bar {
  height: 6px;
  width: 100%;
}

.project-content {
  padding: 1.25rem;
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.5rem;
}

.project-name {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--gray-800);
}

.project-position {
  font-size: 0.75rem;
  color: var(--gray-400);
  background: var(--gray-100);
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
}

.project-description {
  font-size: 0.875rem;
  color: var(--gray-500);
  margin-bottom: 1rem;
  line-height: 1.4;
}

.project-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  padding: 0.875rem;
  background: var(--gray-50);
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.stat {
  text-align: center;
}

.stat-label {
  display: block;
  font-size: 0.6875rem;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.125rem;
}

.stat-value {
  display: block;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--gray-800);
}

.stat-detail {
  display: block;
  font-size: 0.6875rem;
  color: var(--gray-400);
}

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

.inline-form {
  display: inline;
}

/* Active Project */
.project-active {
  border: 2px solid var(--success);
}

.active-indicator {
  position: absolute;
  top: 1rem;
  right: 1rem;
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--success);
  background: rgba(34, 197, 94, 0.1);
  padding: 0.25rem 0.625rem;
  border-radius: 9999px;
}

.pulse {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(1.2);
  }
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
}

.empty-state h2 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--gray-700);
}

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

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: white;
  border-radius: var(--radius);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--gray-200);
}

.modal-header h2 {
  font-size: 1.125rem;
}

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

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

.modal-content form {
  padding: 1.5rem;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--gray-200);
}

/* Edit Page */
.edit-container {
  max-width: 600px;
  margin: 0 auto;
}

.edit-card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
}

.edit-card h1 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.divider {
  border: none;
  border-top: 1px solid var(--gray-200);
  margin: 2rem 0;
}

.danger-zone {
  padding: 1.25rem;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: var(--radius);
}

.danger-zone h3 {
  font-size: 1rem;
  color: var(--danger);
  margin-bottom: 0.5rem;
}

.danger-zone p {
  font-size: 0.875rem;
  color: var(--gray-600);
  margin-bottom: 1rem;
}

/* Error Page */
.error-container {
  min-height: calc(100vh - 4rem);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.error-card {
  text-align: center;
  background: white;
  padding: 3rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.error-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
}

.error-card h1 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

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

/* Responsive */
@media (max-width: 768px) {
  .navbar {
    padding: 1rem;
  }

  .container {
    padding: 1rem;
  }

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

  .dashboard-actions {
    width: 100%;
  }

  .dashboard-actions .btn {
    flex: 1;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

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

  .project-stats {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
  }

  .stat-label {
    margin-bottom: 0;
  }

  .auth-card {
    padding: 1.5rem;
  }
}