:root {
    --bg: #0f1115;
    --card: #1a1d24;
    --fg: #e7e9ee;
    --muted: #9aa1ac;
    --accent: #4f9cf9;
    --ok: #2ecc71;
    --err: #e74c3c;
    --warn: #f1c40f;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    color: var(--fg);
    font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
    padding: 1rem;
}

.card {
    background: var(--card);
    border: 1px solid #2a2e38;
    border-radius: 14px;
    padding: 2rem;
    width: 100%;
    max-width: 26rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, .4);
}

.card.ok { border-color: var(--ok); }
.card.err { border-color: var(--err); }

h1 { margin: 0 0 1rem; font-size: 1.4rem; }

.ip { color: var(--muted); }
.ip strong { color: var(--fg); }
.warn { color: var(--warn); }

label {
    display: block;
    margin: 1rem 0 .35rem;
    color: var(--muted);
    font-size: .9rem;
}

input[type=text],
input[type=password],
input[type=number] {
    width: 100%;
    padding: .7rem .8rem;
    font-size: 1.1rem;
    border-radius: 9px;
    border: 1px solid #333845;
    background: #12141a;
    color: var(--fg);
}

button {
    margin-top: 1.1rem;
    width: 100%;
    padding: .75rem;
    font-size: 1.05rem;
    border: 0;
    border-radius: 9px;
    background: var(--accent);
    color: #fff;
    cursor: pointer;
}

button:hover { filter: brightness(1.08); }

a { color: var(--accent); }

/* --- admin --- */
body.admin {
    display: block;
    align-items: initial;
    justify-content: initial;
    max-width: 1100px;
    margin: 0 auto;
    padding: 1rem 1.5rem 3rem;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: .75rem 0;
    border-bottom: 1px solid #2a2e38;
    margin-bottom: 1.5rem;
}

.topbar nav a {
    margin-right: 1rem;
    text-decoration: none;
}

.muted { color: var(--muted); }

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0 2rem;
    font-size: .92rem;
}

th, td {
    text-align: left;
    padding: .5rem .6rem;
    border-bottom: 1px solid #262a33;
    vertical-align: top;
}

th { color: var(--muted); font-weight: 600; }

code { color: #cfe3ff; }

.actions { display: flex; gap: .4rem; flex-wrap: wrap; }

form.inline { display: inline-flex; gap: .35rem; align-items: center; margin: 0; }

button.link {
    background: none;
    color: var(--accent);
    width: auto;
    padding: 0;
    margin: 0;
}

button.danger { background: var(--err); width: auto; padding: .35rem .6rem; margin: 0; }
.actions button, .actions select { width: auto; margin: 0; padding: .35rem .5rem; font-size: .85rem; }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
@media (max-width: 720px) { .grid2 { grid-template-columns: 1fr; } }

textarea {
    width: 100%;
    background: #12141a;
    color: var(--fg);
    border: 1px solid #333845;
    border-radius: 9px;
    padding: .6rem;
    font-family: ui-monospace, monospace;
}

select, input[type=number] {
    background: #12141a;
    color: var(--fg);
    border: 1px solid #333845;
    border-radius: 9px;
    padding: .5rem;
}

.badge { padding: .1rem .5rem; border-radius: 999px; font-size: .78rem; }
.badge.unused { background: #1f3a5f; color: #cfe3ff; }
.badge.used { background: #2e4d35; color: #cdefd6; }
.badge.expired, .badge.revoked { background: #4a2730; color: #ffd6d6; }

.reveal .code-lg code { font-size: 1.5rem; letter-spacing: .03em; color: #fff; }