:root {
    --bg: #f4f5f7;
    --surface: #ffffff;
    --ink: #1f2933;
    --ink-soft: #5b6672;
    --line: #e2e6ea;
    --brand: #0b2740;
    --accent: #1d6fe0;
    --platform: #6b3fd1;
    --danger: #c92f3c;
    --danger-soft: #fde8ea;
    --ok: #1f9d57;
    --radius: 10px;
    --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .1);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
    color: var(--ink);
    background: var(--bg);
    font-size: 15px;
    line-height: 1.5;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; background: #eef1f4; padding: .1em .35em; border-radius: 4px; font-size: .92em; }

.app-shell { min-height: 100vh; display: flex; flex-direction: column; }

.topbar {
    display: flex; align-items: center; justify-content: space-between;
    height: 56px; padding: 0 24px;
    background: var(--brand); color: #fff;
}
.brand { color: #fff; font-weight: 600; font-size: 1.05rem; letter-spacing: .2px; }
.brand:hover { text-decoration: none; }
.brand-accent { color: #7fb2ff; font-weight: 600; }
.topbar-right { display: flex; align-items: center; gap: 16px; }
.user { color: #cdd7e2; font-size: .9rem; }
.inline-form { margin: 0; }
.link-button { background: none; border: none; color: #cdd7e2; cursor: pointer; font: inherit; padding: 0; }
.link-button:hover { color: #fff; text-decoration: underline; }

.content { flex: 1; }
.page { max-width: 1040px; margin: 0 auto; padding: 32px 24px 64px; }

.page-title { font-size: 1.55rem; margin: 0 0 4px; display: flex; align-items: center; gap: 12px; }
.page-subtitle { color: var(--ink-soft); margin: 0 0 24px; }
.muted { color: var(--ink-soft); }
.small { font-size: .85rem; }

.breadcrumb { color: var(--ink-soft); font-size: .9rem; margin-bottom: 12px; }
.breadcrumb .sep { margin: 0 6px; color: #b6c0ca; }

.badge { display: inline-block; font-size: .72rem; font-weight: 600; letter-spacing: .4px; text-transform: uppercase; padding: 3px 8px; border-radius: 999px; }
.badge-platform { background: #efe9fb; color: var(--platform); }

.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 16px; }
.group-card {
    display: block; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
    padding: 18px; box-shadow: var(--shadow); color: var(--ink); transition: border-color .12s, transform .12s;
}
.group-card:hover { text-decoration: none; border-color: var(--accent); transform: translateY(-1px); }
.group-card.is-platform { border-left: 4px solid var(--platform); }
.group-card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.group-name { font-weight: 600; font-size: 1.1rem; }
.group-stats { display: flex; gap: 16px; color: var(--ink-soft); font-size: .9rem; }
.group-stats strong { color: var(--ink); }
.group-when { margin-top: 10px; color: #98a3ae; font-size: .82rem; }

.grid { width: 100%; border-collapse: collapse; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.grid th, .grid td { text-align: left; padding: 11px 16px; border-bottom: 1px solid var(--line); }
.grid thead th { background: #f8fafc; color: var(--ink-soft); font-weight: 600; font-size: .82rem; text-transform: uppercase; letter-spacing: .3px; }
.grid tbody tr:last-child td { border-bottom: none; }
.grid tbody tr:hover { background: #f8fafc; }
.grid .num { text-align: right; }
.mono { font-family: ui-monospace, Consolas, monospace; }
.strong-link { font-weight: 600; }
.row-action { text-align: right; }

.search { display: flex; gap: 8px; margin-bottom: 20px; }
.search input { flex: 0 1 320px; }

.empty { background: var(--surface); border: 1px dashed var(--line); border-radius: var(--radius); padding: 40px; text-align: center; color: var(--ink-soft); }

input { font: inherit; padding: 9px 11px; border: 1px solid #cbd3db; border-radius: 8px; background: #fff; color: var(--ink); }
input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(29, 111, 224, .15); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; font: inherit; font-weight: 600; padding: 9px 16px; border-radius: 8px; border: 1px solid transparent; cursor: pointer; }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #185cba; }
.btn-secondary { background: #fff; color: var(--ink); border-color: #cbd3db; }
.btn-secondary:hover { background: #f1f4f7; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #a81f2b; }
.btn-danger-sm { background: #fff; color: var(--danger); border-color: #e7b9bd; padding: 5px 12px; font-size: .85rem; }
.btn-danger-sm:hover { background: var(--danger-soft); }
.btn-block { width: 100%; }

.alert { border-radius: 8px; padding: 11px 14px; margin-bottom: 16px; font-size: .92rem; }
.alert-error { background: var(--danger-soft); color: #8f2530; border: 1px solid #f0c2c7; }

.login-page { min-height: calc(100vh - 56px); display: flex; align-items: center; justify-content: center; padding: 24px; }
.login-card { width: 100%; max-width: 380px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); padding: 32px; }
.login-brand { font-size: 1.3rem; font-weight: 600; color: var(--brand); }
.login-brand .brand-accent { color: var(--accent); }
.login-sub { color: var(--ink-soft); margin: 6px 0 22px; }
.login-form { display: flex; flex-direction: column; gap: 16px; }

.field { display: flex; flex-direction: column; gap: 6px; font-size: .9rem; color: var(--ink-soft); }
.field input { color: var(--ink); }

.danger-card { background: var(--surface); border: 1px solid #f0c2c7; border-top: 4px solid var(--danger); border-radius: var(--radius); padding: 28px; max-width: 620px; box-shadow: var(--shadow); }
.danger-title { margin: 0 0 14px; color: #8f2530; font-size: 1.3rem; }
.danger-card .warn { color: #8f2530; background: var(--danger-soft); border-radius: 8px; padding: 10px 12px; }
.danger-form { margin-top: 18px; display: flex; flex-direction: column; gap: 16px; }
.danger-actions { display: flex; gap: 10px; justify-content: flex-end; }