:root {
    --bg: #0f172a;
    --card: #111827;
    --accent: #10b981;
    --accent-strong: #0ea271;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --danger: #ef4444;
    --border: #1f2937;
    font-family: "Segoe UI", "SF Pro Display", system-ui, -apple-system, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: radial-gradient(circle at 20% 20%, #0b1224, #0a1020 40%, #070c18 100%);
    color: var(--text);
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    border-bottom: 1px solid var(--border);
    background: rgba(13, 18, 33, 0.8);
    position: sticky;
    top: 0;
    backdrop-filter: blur(8px);
}

.brand {
    font-weight: 700;
    letter-spacing: 0.5px;
}

.status {
    padding: 6px 10px;
    border-radius: 8px;
    border: 1px solid var(--border);
    font-size: 0.9rem;
}

.container {
    padding: 16px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    max-width: 960px;
    margin: 0 auto;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 16px;
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.35);
}

.card h2, .card h3 {
    margin-top: 0;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

button {
    background: var(--accent);
    color: #03160f;
    border: none;
    padding: 12px 16px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.05s ease, box-shadow 0.2s ease, background 0.2s ease;
}

button:hover {
    transform: translateY(-1px);
    background: var(--accent-strong);
}

button:active {
    transform: translateY(0);
}

button.ghost {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

.field {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 12px;
}

.field label {
    color: var(--muted);
    font-size: 0.9rem;
}

.field input, .field select {
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: #0c1426;
    color: var(--text);
}

.field.checkbox {
    flex-direction: row;
    align-items: center;
    gap: 10px;
}

.nested {
    padding: 12px;
    border-radius: 12px;
    background: #0c1325;
    border: 1px dashed var(--border);
}

.hint {
    color: var(--muted);
    font-size: 0.85rem;
}

.status-box, .output-box {
    background: #0c1220;
    border: 1px solid var(--border);
    padding: 12px;
    border-radius: 12px;
    white-space: pre-wrap;
    word-break: break-all;
}

.output-box {
    border-color: var(--accent);
}

.hidden {
    display: none;
}

.register-block {
    margin-top: 12px;
    padding: 12px;
    border-radius: 10px;
    background: #0c1424;
    border: 1px dashed var(--border);
}

@media (min-width: 768px) {
    .container {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .card {
        padding: 20px;
    }
}