:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --success: #10b981;
    --danger: #ef4444;
    --background: #f8fafc;
    --surface: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
    --radius: 8px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--background);
    color: var(--text);
    line-height: 1.5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Card layout */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    margin-bottom: 1.5rem;
}

/* Buttons */
.btn {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s;
}

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

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

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    background: var(--surface);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
}

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

th {
    background: #f1f5f9;
    font-weight: 600;
    color: var(--text);
}

/* Forms & Inputs */
input, select, textarea {
    width: 100%;
    padding: 0.75rem;
    margin-top: 0.25rem;
    margin-bottom: 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
}

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