:root {
    --bg: #f4f4f5;
    --card: #ffffff;
    --text: #18181b;
    --muted: #52525b;
    --border: #e4e4e7;
    --accent: #18181b;
    --accent-text: #ffffff;
    --ok-bg: #ecfdf5;
    --ok-border: #a7f3d0;
    --ok-text: #065f46;
    --err-bg: #fef2f2;
    --err-border: #fecaca;
    --err-text: #991b1b;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #18181b;
        --card: #27272a;
        --text: #fafafa;
        --muted: #a1a1aa;
        --border: #3f3f46;
        --accent: #fafafa;
        --accent-text: #18181b;
        --ok-bg: #052e23;
        --ok-border: #065f46;
        --ok-text: #6ee7b7;
        --err-bg: #3f1417;
        --err-border: #7f1d1d;
        --err-text: #fca5a5;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    padding: 32px 16px;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
    max-width: 560px;
    margin: 0 auto;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 32px;
}

h1 {
    margin: 0 0 8px;
    font-size: 24px;
    line-height: 1.3;
}

.lead {
    margin: 0 0 24px;
    color: var(--muted);
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 14px;
}

input[type="email"] {
    width: 100%;
    padding: 12px 14px;
    font: inherit;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
}

input[type="email"]:focus-visible,
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

button,
.button {
    display: inline-block;
    margin-top: 16px;
    padding: 12px 20px;
    font: inherit;
    font-weight: 600;
    color: var(--accent-text);
    background: var(--accent);
    border: 0;
    border-radius: 8px;
    text-decoration: none;
    cursor: pointer;
}

button:hover,
.button:hover { opacity: .88; }

.notice {
    margin: 0 0 24px;
    padding: 14px 16px;
    border-radius: 8px;
    border: 1px solid;
    font-size: 15px;
}

.notice--ok {
    background: var(--ok-bg);
    border-color: var(--ok-border);
    color: var(--ok-text);
}

.notice--error {
    background: var(--err-bg);
    border-color: var(--err-border);
    color: var(--err-text);
}

ul.vouchers {
    list-style: none;
    margin: 0 0 24px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 8px;
}

ul.vouchers li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
}

ul.vouchers li:last-child { border-bottom: 0; }

ul.vouchers .shift {
    color: var(--muted);
    font-size: 14px;
}

ul.vouchers a {
    color: var(--text);
    font-weight: 600;
    white-space: nowrap;
}

footer {
    margin-top: 24px;
    text-align: center;
    font-size: 13px;
    color: var(--muted);
}