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

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #8b5cf6;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --bg: #ffffff;
  --bg-alt: #f9fafb;
  --text: #111827;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --shadow: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
  --primary: #818cf8;
  --primary-dark: #6366f1;
  --secondary: #a78bfa;
  --success: #34d399;
  --danger: #f87171;
  --warning: #fbbf24;
  --bg: #1f2937;
  --bg-alt: #111827;
  --text: #f9fafb;
  --text-muted: #9ca3af;
  --border: #374151;
  --shadow: rgba(0, 0, 0, 0.3);
}

[data-theme="retro"] {
  --primary: #33ff33;
  --primary-dark: #00ff00;
  --secondary: #00cc00;
  --success: #33ff33;
  --danger: #ff3333;
  --warning: #ffff00;
  --bg: #000000;
  --bg-alt: #0a0a0a;
  --text: #33ff33;
  --text-muted: #00aa00;
  --border: #00ff00;
  --shadow: rgba(0, 255, 0, 0.3);
  font-family: 'Courier New', monospace;
}

[data-theme="retro"] body {
  background: #000000;
  text-shadow: 0 0 5px rgba(51, 255, 51, 0.5);
}

[data-theme="retro"] .app-header,
[data-theme="retro"] .app-nav,
[data-theme="retro"] .stat-card,
[data-theme="retro"] .card,
[data-theme="retro"] .table-container,
[data-theme="retro"] .form-container {
  border-color: #00ff00;
  box-shadow: 0 0 10px rgba(0, 255, 0, 0.2);
}

[data-theme="retro"] .btn-primary {
  background: #000000;
  color: #33ff33;
  border: 2px solid #00ff00;
  box-shadow: 0 0 10px rgba(0, 255, 0, 0.3);
}

[data-theme="retro"] .btn-primary:hover {
  background: #00ff00;
  color: #000000;
  box-shadow: 0 0 20px rgba(0, 255, 0, 0.6);
}

[data-theme="retro"] .btn-secondary {
  background: #000000;
  color: #33ff33;
  border: 1px solid #00aa00;
}

[data-theme="retro"] .nav-tab.active {
  background: #00ff00;
  color: #000000;
  text-shadow: none;
}

[data-theme="retro"] input,
[data-theme="retro"] select,
[data-theme="retro"] textarea {
  background: #000000;
  color: #33ff33;
  border: 1px solid #00ff00;
  text-shadow: 0 0 3px rgba(51, 255, 51, 0.5);
}

[data-theme="retro"] input:focus,
[data-theme="retro"] select:focus,
[data-theme="retro"] textarea:focus {
  border-color: #33ff33;
  box-shadow: 0 0 10px rgba(0, 255, 0, 0.5);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

/* Landing Page */
.landing-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}

.landing-container {
  text-align: center;
  padding: 2rem;
  max-width: 1200px;
}

.landing-hero {
  background: var(--bg);
  padding: 3rem;
  border-radius: 1rem;
  box-shadow: 0 20px 60px var(--shadow);
  margin-bottom: 3rem;
}

.landing-hero h1 {
  font-size: 4rem;
  margin-bottom: 1rem;
  color: var(--primary);
}

.tagline {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.feature {
  background: var(--bg);
  padding: 2rem;
  border-radius: 0.75rem;
  box-shadow: 0 10px 30px var(--shadow);
}

.feature .icon {
  font-size: 3rem;
  display: block;
  margin-bottom: 1rem;
}

.feature h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--primary);
}

/* App Header */
.app-header {
  background: var(--bg-alt);
  border-bottom: 2px solid var(--border);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

.header-left h1 {
  font-size: 1.5rem;
  color: var(--primary);
}

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

.user-email {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Navigation */
.app-nav {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0.5rem 2rem;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

.nav-tab {
  background: none;
  border: none;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 0.5rem;
  transition: all 0.2s;
  white-space: nowrap;
}

.nav-tab:hover {
  background: var(--bg-alt);
  color: var(--text);
}

.nav-tab.active {
  background: var(--primary);
  color: white;
  font-weight: 600;
}

/* Main View */
.main-view {
  padding: 2rem;
  max-width: 1400px;
  margin: 0 auto;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-danger, .btn-success, .btn-icon {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}

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

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

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

.btn-danger:hover {
  opacity: 0.9;
}

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

.btn-icon {
  background: none;
  padding: 0.5rem;
  font-size: 1.2rem;
}

/* Stats Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-alt);
  padding: 1.5rem;
  border-radius: 0.75rem;
  border: 1px solid var(--border);
  transition: transform 0.2s;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
}

/* Tables */
.table-container {
  background: var(--bg-alt);
  border-radius: 0.75rem;
  border: 1px solid var(--border);
  overflow-x: auto;
}

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

th {
  background: var(--bg);
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--border);
  position: sticky;
  top: 0;
}

td {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
}

tr:hover {
  background: var(--bg);
}

/* Cards */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  transition: all 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}

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

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary);
}

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

.card-info {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.card-info-item {
  display: flex;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.card-info-label {
  color: var(--text-muted);
  font-weight: 500;
}

/* Forms */
.form-container {
  background: var(--bg-alt);
  border-radius: 0.75rem;
  border: 1px solid var(--border);
  padding: 2rem;
  max-width: 800px;
  margin: 0 auto;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

label {
  font-weight: 600;
  color: var(--text);
}

input, select, textarea {
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  font-size: 1rem;
  background: var(--bg);
  color: var(--text);
  transition: border-color 0.2s;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.checkbox-group input[type="checkbox"] {
  width: auto;
}

/* Dropdowns */
.dropdown {
  position: relative;
}

.dropdown-toggle::after {
  content: ' ▼';
  font-size: 0.7rem;
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  box-shadow: 0 4px 12px var(--shadow);
  min-width: 180px;
  z-index: 1000;
  margin-top: 0.5rem;
}

.dropdown.show .dropdown-menu,
.dropdown:hover .dropdown-menu,
.dropdown-menu:hover {
  display: block;
}

.dropdown-item {
  display: block;
  width: 100%;
  padding: 0.75rem 1rem;
  border: none;
  background: none;
  text-align: left;
  cursor: pointer;
  color: var(--text);
  transition: background 0.2s;
  white-space: nowrap;
}

.dropdown-item:hover {
  background: var(--bg-alt);
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: 1rem;
}

.modal {
  background: var(--bg);
  border-radius: 0.75rem;
  max-width: 900px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px var(--shadow);
}

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

.modal-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary);
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  padding: 0.25rem;
}

.modal-body {
  padding: 1.5rem;
}

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

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 1rem 1.5rem;
  border-radius: 0.5rem;
  background: var(--success);
  color: white;
  font-weight: 600;
  box-shadow: 0 4px 12px var(--shadow);
  transform: translateY(150%);
  transition: transform 0.3s;
  z-index: 3000;
}

.toast.show {
  transform: translateY(0);
}

.toast.error {
  background: var(--danger);
}

/* Utility Classes */
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mt-2 { margin-top: 1rem; }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }

.action-btn {
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  font-size: 1.2rem;
  transition: transform 0.2s;
}

.action-btn:hover {
  transform: scale(1.1);
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.85rem;
  font-weight: 600;
}

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

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

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

.header-select {
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--text-muted);
}

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

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

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

  .app-nav {
    padding: 0.5rem 1rem;
  }

  .main-view {
    padding: 1rem;
  }

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

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

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

  .landing-hero h1 {
    font-size: 2.5rem;
  }
}