:root {
    --primary: #2563eb;
    --primary-dark: #1e4fb8;
    --background: #f6f7fb;
    --card-bg: #ffffff;
    --text: #1f2933;
    --muted: #55616f;
    --border: #e5e7eb;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--background);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 1rem;
}

.site-header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    gap: 1rem;
}

.logo a {
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 1rem;
    padding: 0;
    margin: 0;
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--text);
    text-decoration: none;
    font-weight: 600;
}

.nav-links a:hover {
    color: var(--primary);
}

main.container {
    padding: 2rem 1rem 3rem;
}

.card, .result-card, .info-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.04);
}

h1, h2, h3 {
    margin-top: 0;
    color: #111827;
}

p {
    color: var(--muted);
}

form {
    display: grid;
    gap: 1rem;
}

label {
    font-weight: 600;
    color: #111827;
}

input, select, button {
    font: inherit;
}

input[type="date"],
input[type="number"],
input[type="text"],
input[type="datetime-local"],
select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
}

button {
    padding: 0.85rem 1.25rem;
    border: none;
    border-radius: 8px;
    background: var(--primary);
    color: #fff;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s ease;
}

button:hover {
    background: var(--primary-dark);
}

.related {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.related ul {
    padding-left: 1.25rem;
    margin: 0.5rem 0 0;
}

.result-card strong {
    color: #111827;
}

.error {
    color: #b91c1c;
    background: #fee2e2;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    border: 1px solid #fecaca;
}

.success {
    color: #0f5132;
    background: #d1e7dd;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    border: 1px solid #badbcc;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1rem;
}

.site-footer {
    border-top: 1px solid var(--border);
    background: #f1f2f6;
    padding: 1.5rem 0;
    color: var(--muted);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.footer-links {
    display: flex;
    gap: 1rem;
}

.footer-links a {
    color: var(--text);
    text-decoration: none;
    font-weight: 600;
}

.footer-links a:hover {
    color: var(--primary);
}

.muted {
    color: var(--muted);
    margin: 0;
}

@media (max-width: 768px) {
    .nav-wrapper {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-links {
        flex-wrap: wrap;
    }

    .footer-content {
        flex-direction: column;
        align-items: flex-start;
    }
}