:root {
    color-scheme: light dark;
    --bg: #101828;
    --card: #ffffff;
    --text: #182230;
    --muted: #667085;
    --primary: #155eef;
    --primary-dark: #004eeb;
    --border: #d0d5dd;
    --danger: #b42318;
    --warning-bg: #fff8db;
    --success-bg: #dcfae6;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: radial-gradient(circle at top, #344054, var(--bg));
    color: var(--text);
    padding: 24px;
}
.card {
    width: min(100%, 520px);
    background: var(--card);
    border-radius: 20px;
    padding: 32px;
    box-shadow: 0 20px 60px rgba(0,0,0,.25);
}
h1 { margin: 0 0 16px; font-size: 2rem; }
.muted { color: var(--muted); }
.form { display: grid; gap: 16px; margin-top: 24px; }
label { display: grid; gap: 6px; font-weight: 600; }
input {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 14px;
    font: inherit;
}
button, .button {
    display: inline-block;
    border: 0;
    border-radius: 999px;
    padding: 12px 20px;
    background: var(--primary);
    color: #fff;
    text-decoration: none;
    font-weight: 700;
    cursor: pointer;
    text-align: center;
}
button:hover, .button:hover { background: var(--primary-dark); }
.button.secondary { background: #344054; }
.link { display: inline-block; margin-left: 12px; color: var(--primary); }
.error { color: var(--danger); font-weight: 700; }
.notice {
    border: 1px solid var(--border);
    background: #f9fafb;
    border-radius: 12px;
    padding: 14px 16px;
    margin: 16px 0;
}
.notice.warning { background: var(--warning-bg); }
.notice.success { background: var(--success-bg); }
.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 16px;
    margin-bottom: 24px;
}
@media (prefers-color-scheme: dark) {
    :root { --card: #1d2939; --text: #f9fafb; --muted: #98a2b3; --border: #475467; }
    input { background: #101828; color: #f9fafb; }
    .notice { background: #344054; }
    .notice.warning { color: #182230; }
    .notice.success { color: #182230; }
}