body {
    font-family: "Inter", "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: radial-gradient(circle at 10% 10%, #f0f7ff, #e9eef6 45%, #e6f0ff);
    color: #1b263b;
}

.site-header {
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    gap: 1rem;
    padding: 1rem 2rem;
    background: #0a3d62;
    color: #fff;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
}

.branding h1 {
    margin: 0;
    letter-spacing: 0.02em;
}

.branding .tagline {
    margin: 0;
    font-size: 0.9rem;
    opacity: 0.85;
}

nav a {
    color: #fff;
    margin-right: 1rem;
    text-decoration: none;
    font-weight: 600;
}

nav a:hover {
    text-decoration: underline;
}

.user-summary {
    font-size: 0.9rem;
    text-align: right;
}

main {
    padding: 2rem;
}

.card {
    background: #fff;
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
    margin-bottom: 1rem;
}

.card h2 {
    margin-top: 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

table th, table td {
    padding: 0.65rem;
    border-bottom: 1px solid #d8e2ec;
    text-align: left;
}

table th {
    background: #f1f5fb;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.03em;
}

.btn {
    display: inline-block;
    padding: 0.6rem 1rem;
    border-radius: 6px;
    text-decoration: none;
    background: #0a3d62;
    color: #fff;
    font-weight: 600;
}

.btn-secondary {
    background: #1b263b;
}

.flash {
    padding: 0.75rem 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.flash.success {
    background: #e6ffed;
    color: #0f5132;
}

.flash.error {
    background: #ffe6e6;
    color: #842029;
}

footer {
    text-align: center;
    padding: 1rem 0 2rem;
    color: #52616b;
    font-size: 0.85rem;
}