:root {
    --primary-color: #1a73e8;
    --secondary-color: #34a853;
    --danger-color: #ea4335;
    --warning-color: #fbbc04;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --border-color: #dadce0;
    --shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --shadow-hover: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
    --radius: 8px;
    --spacing: 16px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-secondary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing);
}

.card {
    background: var(--bg-primary);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: calc(var(--spacing) * 1.5);
    margin-bottom: var(--spacing);
}

.card:hover {
    box-shadow: var(--shadow-hover);
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

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

.btn-primary:hover {
    background: #1557b0;
}

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

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

.form-group {
    margin-bottom: var(--spacing);
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 14px;
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

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

.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: var(--spacing);
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
}

.table th,
.table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    font-weight: 600;
    background: var(--bg-secondary);
}

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

.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background: #d4edda;
    color: #155724;
}

.badge-warning {
    background: #fff3cd;
    color: #856404;
}

.badge-danger {
    background: #f8d7da;
    color: #721c24;
}

.nav {
    background: var(--bg-primary);
    box-shadow: var(--shadow);
    padding: var(--spacing);
    margin-bottom: calc(var(--spacing) * 2);
}

.nav-list {
    list-style: none;
    display: flex;
    gap: var(--spacing);
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: var(--radius);
    transition: background 0.2s;
}

.nav-link:hover,
.nav-link.active {
    background: var(--bg-secondary);
}

.grid {
    display: grid;
    gap: var(--spacing);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

@media (max-width: 768px) {
    .container {
        padding: calc(var(--spacing) / 2);
    }
    
    .nav-list {
        flex-direction: column;
        gap: 8px;
    }
    
    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }
}

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.mt-1 { margin-top: var(--spacing); }
.mt-2 { margin-top: calc(var(--spacing) * 2); }
.mb-1 { margin-bottom: var(--spacing); }
.mb-2 { margin-bottom: calc(var(--spacing) * 2); }
.p-1 { padding: var(--spacing); }
.p-2 { padding: calc(var(--spacing) * 2); }