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

:root {
  --primary-color: #3b82f6;
  --primary-dark: #2563eb;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --background: #f8fafc;
  --surface: #ffffff;
  --surface-hover: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius: 8px;
  --radius-lg: 12px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
}

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

/* Header */
.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo i {
  font-size: 2rem;
  color: var(--primary-color);
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.header-stats {
  display: flex;
  gap: 1rem;
}

.stat-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--surface-hover);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.stat-card i {
  font-size: 1.25rem;
  color: var(--primary-color);
}

.stat-number {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Main Content */
.main-content {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  width: 100%;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 2rem;
  background: var(--surface);
  padding: 0.25rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.tab-button {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: transparent;
  border: none;
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-button:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
}

.tab-button.active {
  background: var(--primary-color);
  color: white;
  box-shadow: var(--shadow-sm);
}

.tab-button i {
  font-size: 1rem;
}

/* Tab Content */
.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Cards */
.card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card-header {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface-hover);
}

.card-header h2 {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.card-header p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.card-header .btn {
  margin-left: auto;
}

/* Forms */
.form {
  padding: 2rem;
}

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

.form-group label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  transition: all 0.2s ease;
  background: var(--surface);
}

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

/* Checkbox */
.checkbox-group {
  margin: 1.5rem 0;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  font-weight: 500;
}

.checkbox-label input[type="checkbox"] {
  width: auto;
  margin: 0;
}

.checkmark {
  position: relative;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-radius: 4px;
  transition: all 0.2s ease;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
  background: var(--primary-color);
  border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 12px;
  font-weight: bold;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

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

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

.btn-danger:hover {
  background: #dc2626;
}

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

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

.section-header h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Input Groups */
.input-group {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.input-group input {
  flex: 1;
}

.input-group .btn {
  flex-shrink: 0;
}

/* Tables */
.table-container {
  padding: 1.5rem;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

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

th {
  background: var(--surface-hover);
  font-weight: 600;
  color: var(--text-primary);
}

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

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

.file-card {
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-hover);
  transition: all 0.2s ease;
}

.file-card:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.file-card h4 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.file-list {
  list-style: none;
}

.file-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

.file-list li:last-child {
  border-bottom: none;
}

.file-name {
  font-size: 0.75rem;
  color: var(--text-secondary);
  word-break: break-all;
}

/* Messages */
.message {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
}

.message.success {
  background: rgb(16 185 129 / 0.1);
  color: var(--success-color);
  border: 1px solid rgb(16 185 129 / 0.2);
}

.message.error {
  background: rgb(239 68 68 / 0.1);
  color: var(--danger-color);
  border: 1px solid rgb(239 68 68 / 0.2);
}

.message.info {
  background: rgb(59 130 246 / 0.1);
  color: var(--primary-color);
  border: 1px solid rgb(59 130 246 / 0.2);
}

/* Loading */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 2rem;
  color: var(--text-secondary);
}

.loading i {
  font-size: 1.25rem;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.loading-overlay.active {
  display: flex;
}

.loading-content {
  background: var(--surface);
  padding: 2rem;
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1100;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  padding: 1rem 1.5rem;
  border-radius: var(--radius);
  color: white;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: slideIn 0.3s ease;
  max-width: 400px;
}

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

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

.toast.info {
  background: var(--primary-color);
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Responsive */
@media (max-width: 768px) {
  .header-content {
    padding: 1rem;
    flex-direction: column;
    gap: 1rem;
  }

  .header-stats {
    width: 100%;
    justify-content: center;
  }

  .main-content {
    padding: 1rem;
  }

  .tabs {
    flex-direction: column;
  }

  .tab-button {
    justify-content: flex-start;
  }

  .card-header {
    padding: 1rem;
  }

  .form {
    padding: 1rem;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .input-group {
    flex-direction: column;
  }

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

@media (max-width: 480px) {
  .stat-card {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }
}