/* Podstawowy layout */
:root {
    --bg: #f6f7fb;
    --card: #ffffff;
    --accent: #111;
    --muted: #666;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    background: var(--bg);
    color: var(--accent);
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 92%;
    max-width: 980px;
    margin: 0 auto;
    padding: 24px 0;
}

.site-header {
    background: linear-gradient(90deg,#0f172a 0%, #0b1220 100%);
    color: #fff;
    padding: 28px 0;
}

.site-header h1 { margin: 0 0 6px 0; font-size: 22px; }
.site-header p { margin: 0; opacity: 0.9; }

main { padding-bottom: 40px; display: grid; grid-template-columns: repeat(auto-fit,minmax(260px,1fr)); gap: 18px; }

.card {
    background: var(--card);
    border-radius: 10px;
    padding: 18px;
    box-shadow: 0 6px 18px rgba(12,18,30,0.06);
}

.card h2 { margin-top: 0; font-size: 18px; }
.card p { color: var(--muted); margin-bottom: 12px; }

.btn {
    display: inline-block;
    padding: 10px 14px;
    background: #111;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
}

.btn.ghost {
    background: transparent;
    color: #111;
    border: 1px solid #ddd;
}

.input {
    padding: 10px;
    width: 100%;
    margin-top: 8px;
    border-radius: 8px;
    border: 1px solid #e6e6e6;
    font-size: 14px;
}

.result {
    margin-top: 12px;
    font-weight: 600;
}

.hint {
    margin-top: 8px;
    color: #999;
    font-size: 12px;
}

.site-footer {
    padding: 18px 0;
    text-align: center;
    color: #777;
    font-size: 13px;
    border-top: 1px solid #eee;
}