:root {
    color-scheme: dark;
    --bg: #0b1020;
    --card: #121a2d;
    --card-soft: #18233b;
    --border: #263452;
    --text: #eef2ff;
    --muted: #aab6d3;
    --accent: #7c9cff;
    --danger: #ff7b7b;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: Inter, Arial, sans-serif;
    background: linear-gradient(180deg, #09111f 0%, #0b1020 100%);
    color: var(--text);
}

.shell {
    max-width: 1040px;
    margin: 0 auto;
    padding: 24px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    gap: 12px;
}

.topbar-left {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.brand {
    color: var(--text);
    font-weight: 700;
    text-decoration: none;
    font-size: 1.1rem;
}

.subbrand,
.top-link {
    color: var(--muted);
    font-size: 0.95rem;
}

.top-link {
    text-decoration: none;
}

.card {
    background: rgba(18, 26, 45, 0.92);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}

.card.narrow { max-width: 620px; }
.hero h1,
.card h1,
.card h2 {
    margin-top: 0;
}

p {
    color: var(--muted);
    line-height: 1.6;
}

.form,
label {
    display: block;
}

label span {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

textarea,
input,
select,
button {
    width: 100%;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--card-soft);
    color: var(--text);
    padding: 12px 14px;
    font: inherit;
}

textarea {
    resize: vertical;
}

.grid.two,
.grid.two-panels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

button {
    background: var(--accent);
    color: #09111f;
    font-weight: 700;
    cursor: pointer;
    margin-top: 16px;
}

button:hover {
    filter: brightness(1.06);
}

.copy-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 12px;
}

.alert {
    padding: 12px 14px;
    border-radius: 12px;
    margin-bottom: 16px;
}

.alert.error {
    background: rgba(255, 123, 123, 0.12);
    border: 1px solid rgba(255, 123, 123, 0.38);
    color: #ffd4d4;
}

.meta-list {
    display: grid;
    gap: 8px;
    margin: 16px 0;
}

.notice {
    margin: 18px 0;
    padding: 12px 14px;
    border-radius: 12px;
    background: rgba(124, 156, 255, 0.12);
    border: 1px solid rgba(124, 156, 255, 0.35);
    color: #dbe4ff;
}

a {
    color: #b8c9ff;
}

@media (max-width: 780px) {
    .grid.two,
    .grid.two-panels,
    .copy-row,
    .topbar {
        grid-template-columns: 1fr;
        display: grid;
        gap: 12px;
    }

    .shell {
        padding: 16px;
    }
}