:root {
    --bg: #f4f6fa;
    --card: #ffffff;
    --text: #1e2533;
    --muted: #64708a;
    --border: #dde3ec;
    --accent: #1d4e79;
    --accent-hover: #163d60;
    --danger-bg: #fdecec;
    --danger: #a12a2a;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f172a;
        --card: #18223a;
        --text: #e2e8f0;
        --muted: #94a3b8;
        --border: #2a3654;
        --accent: #5b9bd5;
        --accent-hover: #7cb0e0;
        --danger-bg: #3a1d22;
        --danger: #f4a5a5;
    }
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
}

/* Login */
.login-shell { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 16px; }
.login-card {
    width: 100%; max-width: 380px; background: var(--card);
    border: 1px solid var(--border); border-radius: 12px; padding: 2rem;
}
.login-card h1 { margin: 0 0 .25rem; font-size: 1.5rem; }
.subtitle { margin: 0 0 1.5rem; color: var(--muted); font-size: .95rem; }
.subtitle span { font-size: .85rem; }
label { display: block; font-size: .85rem; font-weight: 600; margin: 0 0 .35rem; }
input[type=email], input[type=password] {
    width: 100%; padding: .65rem .75rem; margin-bottom: 1rem; font: inherit;
    border: 1px solid var(--border); border-radius: 8px; background: var(--bg); color: var(--text);
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button[type=submit]:not(.link) {
    width: 100%; padding: .7rem; border: 0; border-radius: 8px; font: inherit; font-weight: 600;
    background: var(--accent); color: #fff; cursor: pointer;
}
button[type=submit]:not(.link):hover { background: var(--accent-hover); }
.alert { background: var(--danger-bg); color: var(--danger); padding: .7rem .85rem; border-radius: 8px; margin-bottom: 1rem; font-size: .9rem; }
.hint { color: var(--muted); font-size: .8rem; margin: 1rem 0 0; text-align: center; }

/* Menu */
.topbar {
    display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap;
    padding: .9rem 16px; background: var(--card); border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; }
.who { display: flex; align-items: center; gap: .75rem; color: var(--muted); font-size: .9rem; }
.who form { margin: 0; }
.link { background: none; border: 0; color: var(--accent); font: inherit; font-weight: 600; cursor: pointer; padding: 0; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 1.5rem 16px 3rem; }
.wrap h1 { font-size: 1.4rem; margin: 0 0 1rem; }
.wrap h2 { font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 1.75rem 0 .75rem; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.tile {
    display: flex; flex-direction: column; gap: .3rem; padding: 1.1rem; text-decoration: none; color: var(--text);
    background: var(--card); border: 1px solid var(--border); border-radius: 12px; transition: border-color .15s, transform .15s;
}
.tile:hover { border-color: var(--accent); transform: translateY(-1px); }
.tile .icon { font-size: 1.5rem; }
.tile .title { font-weight: 600; }
.tile .desc { color: var(--muted); font-size: .85rem; }
.tile .url { color: var(--accent); font-size: .78rem; margin-top: auto; }
.empty { color: var(--muted); }