:root {
    --bg: #0f172a;
    --surface: #111827;
    --surface-soft: #1f2937;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --accent: #8b5cf6;
    --accent-2: #06b6d4;
    --danger: #ef4444;
    --radius: 16px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Inter, "Segoe UI", Tahoma, sans-serif;
    background: radial-gradient(circle at 20% 20%, #1e1b4b 0%, var(--bg) 35%, #020617 100%);
    color: var(--text);
}

.page {
    max-width: 1100px;
    margin: 32px auto;
    padding: 0 16px 32px;
    display: grid;
    gap: 16px;
}

.card {
    background: linear-gradient(165deg, rgba(31, 41, 55, 0.85), rgba(17, 24, 39, 0.95));
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: 0 10px 28px rgba(2, 6, 23, 0.45);
}

.hero h1 {
    margin-top: 0;
    margin-bottom: 10px;
}

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

.grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.field {
    display: grid;
    gap: 8px;
}

.field.full {
    grid-column: 1 / -1;
}

label {
    font-weight: 600;
}

input,
textarea,
button {
    width: 100%;
    border-radius: 12px;
    border: 1px solid rgba(148, 163, 184, 0.25);
    background: var(--surface);
    color: var(--text);
    padding: 12px 14px;
    font: inherit;
}

textarea {
    resize: vertical;
    min-height: 110px;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.3);
}

button {
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    border: 0;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.12s ease, box-shadow 0.12s ease;
}

button:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 20px rgba(6, 182, 212, 0.2);
}

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

.checks {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.checks label,
.inline-check {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

input[type="checkbox"] {
    width: auto;
}

.inline-grid {
    display: grid;
    grid-template-columns: 1fr 110px;
    align-items: center;
    gap: 10px;
}

.errors h2 {
    margin-top: 0;
    color: #fecaca;
}

.errors li {
    color: #fda4af;
}

.notices h2 {
    margin-top: 0;
    color: #bfdbfe;
}

.notices li {
    color: #93c5fd;
}

.result h2 {
    margin-top: 0;
}

code {
    background: rgba(2, 6, 23, 0.65);
    padding: 2px 6px;
    border-radius: 6px;
    color: #c4b5fd;
    word-break: break-all;
}

@media (max-width: 800px) {
    .grid {
        grid-template-columns: 1fr;
    }
}