:root {
    --bg: #0f172a;
    --card: #1e293b;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --accent: #3b82f6;
    --success: #10b981;
    --error: #ef4444;
    --border: #334155;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}
.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--card);
    border-bottom: 1px solid var(--border);
}
.topbar a { color: var(--accent); text-decoration: none; }
.topbar a:hover { text-decoration: underline; }
main.card {
    max-width: 460px;
    margin: 3rem auto;
    background: var(--card);
    padding: 2.5rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}
main.card.wide { max-width: 800px; }
h1 { margin: 0 0 .25rem 0; font-size: 1.6rem; }
h2 { margin-top: 2rem; font-size: 1.15rem; color: var(--muted); }
.muted { color: var(--muted); font-size: .9rem; }
.footer { margin-top: 2rem; font-size: .8rem; text-align: center; }
label {
    display: block;
    margin: 1rem 0;
    font-size: .9rem;
    color: var(--muted);
}
input[type="text"], input[type="password"], input[type="file"], select {
    width: 100%;
    margin-top: .35rem;
    padding: .7rem .8rem;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
}
button {
    width: 100%;
    padding: .8rem;
    background: var(--accent);
    color: white;
    border: 0;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: .5rem;
}
button:hover { filter: brightness(1.1); }
button.danger { background: var(--error); }
button.small { width: auto; padding: .35rem .7rem; font-size: .85rem; }
.alert {
    padding: .75rem 1rem;
    border-radius: 6px;
    margin: 1rem 0;
    font-size: .9rem;
}
.alert.error   { background: rgba(239,68,68,.15); border: 1px solid var(--error); }
.alert.success { background: rgba(16,185,129,.15); border: 1px solid var(--success); }
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: .75rem;
    font-size: .9rem;
}
th, td {
    text-align: left;
    padding: .55rem .6rem;
    border-bottom: 1px solid var(--border);
}
th { color: var(--muted); font-weight: 600; }
form.inline { display: inline; }