* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f5f7fb;
    color: #1f2937;
}

.topbar {
    background: #172554;
    color: white;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    color: white;
    text-decoration: none;
    font-size: 24px;
    font-weight: bold;
}

nav a {
    color: white;
    text-decoration: none;
    margin-left: 16px;
}

.container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 20px;
}

.card {
    background: white;
    border-radius: 18px;
    padding: 28px;
    box-shadow: 0 10px 30px rgba(0,0,0,.08);
    margin-bottom: 24px;
}

h1 {
    margin-top: 0;
    color: #172554;
}

.btn {
    display: inline-block;
    background: #2563eb;
    color: white;
    padding: 12px 18px;
    border-radius: 10px;
    text-decoration: none;
    border: none;
    cursor: pointer;
}

.btn.secondary {
    background: #64748b;
}

input, textarea, select {
    width: 100%;
    padding: 12px;
    margin: 8px 0 16px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    font-size: 16px;
}

.error {
    background: #fee2e2;
    color: #991b1b;
    padding: 12px;
    border-radius: 10px;
    margin-bottom: 16px;
}

.success {
    background: #dcfce7;
    color: #166534;
    padding: 12px;
    border-radius: 10px;
    margin-bottom: 16px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 18px;
}

.stat {
    background: #eef2ff;
    padding: 20px;
    border-radius: 14px;
}

.footer {
    text-align: center;
    color: #64748b;
    padding: 30px;
}