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

:root {
    --primary-color: #4f46e5;
    --primary-dark: #4338ca;
    --secondary-color: #6b7280;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 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);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* Navigation */
.navbar {
    background-color: var(--card-bg);
    box-shadow: var(--shadow);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem 0;
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-header h1 {
    font-size: 2rem;
    color: var(--text-color);
}

.subtitle {
    color: var(--text-light);
    margin-top: 0.5rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
}

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

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

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

.btn-secondary:hover {
    background-color: #4b5563;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

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

.btn-edit:hover {
    background-color: #d97706;
}

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

.btn-delete:hover {
    background-color: #dc2626;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 1.5rem;
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.stat-icon {
    font-size: 3rem;
}

.stat-content h3 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.stat-content p {
    color: var(--text-light);
    font-size: 0.875rem;
}

.stat-link {
    margin-left: auto;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.stat-link:hover {
    text-decoration: underline;
}

/* Features Section */
.features-section {
    margin-top: 3rem;
}

.features-section h2 {
    margin-bottom: 1.5rem;
    font-size: 1.75rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.feature-card p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

/* Content Card */
.content-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
}

.content-card h2 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.content-card h2:first-child {
    margin-top: 0;
}

.tech-list {
    list-style: none;
    padding-left: 0;
}

.tech-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-color);
}

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

.code-block {
    background: #1f2937;
    color: #f9fafb;
    padding: 1.5rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
}

/* Table */
.table-container {
    background: var(--card-bg);
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    overflow-x: auto;
}

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

.data-table thead {
    background-color: var(--bg-color);
}

.data-table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-color);
    border-bottom: 2px solid var(--border-color);
}

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

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

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

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

/* Forms */
.form-container {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    max-width: 600px;
}

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

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* Empty State */
.empty-state {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    text-align: center;
    color: var(--text-light);
}

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

.empty-state a:hover {
    text-decoration: underline;
}

/* Error Page */
.error-page {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--card-bg);
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
}

.error-page h1 {
    font-size: 6rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.error-page h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.error-page p {
    color: var(--text-light);
    margin-bottom: 2rem;
}

/* Footer */
.footer {
    background-color: var(--card-bg);
    padding: 2rem 0;
    margin-top: 3rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-light);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        gap: 1rem;
    }

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

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

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

    .table-container {
        overflow-x: scroll;
    }
}