:root {
    --primary: #2563eb;
    --success: #16a34a;
    --danger: #dc2626;
    --bg: #f8fafc;
    --card: #ffffff;
    --text: #1e293b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    line-height: 1.5;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1rem;
}

nav {
    background: #fff;
    border-bottom: 1px solid #e2e8f0;
    padding: 1rem 0;
    margin-bottom: 2rem;
}

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

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

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.card {
    background: var(--card);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

h2 { border-bottom: 2px solid #e2e8f0; padding-bottom: 0.5rem; margin-top: 2rem; }

table { width: 100%; border-collapse: collapse; background: #fff; margin-bottom: 2rem; }
th, td { padding: 0.75rem; text-align: left; border-bottom: 1px solid #e2e8f0; }
th { background: #f1f5f9; }

.btn-primary { background: var(--primary); color: #fff; border: none; padding: 0.5rem 1rem; border-radius: 0.25rem; cursor: pointer; }
.btn-success { background: var(--success); color: #fff; border: none; padding: 0.25rem 0.5rem; border-radius: 0.25rem; cursor: pointer; }
.btn-danger { background: var(--danger); color: #fff; border: none; padding: 0.25rem 0.5rem; border-radius: 0.25rem; cursor: pointer; }
.btn-secondary { background: #64748b; color: #fff; border: none; padding: 0.5rem 1rem; border-radius: 0.25rem; cursor: pointer; }

.text-success { color: var(--success); font-weight: bold; }
.text-danger { color: var(--danger); font-weight: bold; }

.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.25rem; }
.form-group input, .form-group select { width: 100%; padding: 0.5rem; border: 1px solid #cbd5e1; border-radius: 0.25rem; }