:root {
    --bg: #f4f5f7;
    --surface: #ffffff;
    --text: #202124;
    --muted: #70757a;
    --border: #e1e4e8;
    --primary: #151515;
    --primary-soft: #303030;
    --success: #247a3e;
    --danger: #a53838;
    --sidebar: #1c1c1c;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Tahoma, Arial, sans-serif; background: var(--bg); color: var(--text); }
a { color: inherit; }
.topbar { height: 64px; background: var(--surface); border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; padding: 0 24px; position: sticky; top: 0; z-index: 5; }
.brand { font-size: 22px; font-weight: 800; letter-spacing: 1px; text-decoration: none; }
.topbar-user { display: flex; align-items: center; gap: 16px; }
.link-button { border: 0; background: none; cursor: pointer; text-decoration: underline; font: inherit; }
.layout { display: flex; min-height: calc(100vh - 64px); }
.sidebar { width: 230px; background: var(--sidebar); color: #fff; padding: 24px 14px; display: flex; flex-direction: column; gap: 8px; }
.sidebar a { text-decoration: none; padding: 12px 14px; border-radius: 8px; }
.sidebar a:hover { background: #333; }
.content { flex: 1; padding: 28px; min-width: 0; }
.content-full { width: 100%; }
.page-header { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 22px; }
h1, h2 { margin-top: 0; }
.muted { color: var(--muted); }
.btn { display: inline-block; padding: 11px 18px; border-radius: 9px; text-decoration: none; border: 0; cursor: pointer; font: inherit; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-soft); }
.btn-secondary { background: #e8eaed; color: var(--text); }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin-bottom: 22px; }
.stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 20px; }
.stat-card strong { display: block; font-size: 26px; margin-bottom: 8px; }
.stat-card span { color: var(--muted); }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 20px; margin-bottom: 20px; }
.card-header { display: flex; justify-content: space-between; align-items: center; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; min-width: 620px; }
th, td { padding: 13px 10px; border-bottom: 1px solid var(--border); text-align: right; }
th { background: #fafafa; }
.badge { display: inline-block; padding: 5px 9px; border-radius: 99px; font-size: 13px; }
.badge.success { background: #e5f4e9; color: var(--success); }
.badge.danger { background: #f7e5e5; color: var(--danger); }
.auth-card { width: min(92%, 430px); margin: 70px auto; background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 28px; }
.form-card { max-width: 800px; }
.stack-form p { margin-bottom: 16px; }
.stack-form label { display: block; font-weight: 700; margin-bottom: 7px; }
.form-control, .stack-form input, .stack-form select { width: 100%; padding: 11px 12px; border: 1px solid #cfd3d7; border-radius: 8px; font: inherit; }
.form-check-input { width: auto !important; }
.helptext { display: block; color: var(--muted); font-size: 13px; margin-top: 5px; }
.errorlist { color: var(--danger); }
.form-actions { display: flex; gap: 10px; margin-top: 22px; }
.message { padding: 12px 14px; border-radius: 8px; margin-bottom: 16px; }
.message-success { background: #e5f4e9; color: var(--success); }
.message-error { background: #f7e5e5; color: var(--danger); }
.two-columns { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.clean-list { list-style: none; padding: 0; margin: 0; }
.clean-list li { padding: 10px 0; border-bottom: 1px solid var(--border); }
.action-card { display: block; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 24px; text-decoration: none; }
.action-card strong { display: block; font-size: 21px; margin-bottom: 8px; }
.action-card span { color: var(--muted); }
.notice-card { margin-top: 20px; }
@media (max-width: 780px) {
    .sidebar { width: 170px; }
    .content { padding: 18px; }
    .two-columns { grid-template-columns: 1fr; }
}
@media (max-width: 580px) {
    .topbar { padding: 0 14px; }
    .layout { display: block; }
    .sidebar { width: 100%; flex-direction: row; overflow-x: auto; padding: 10px; }
    .sidebar a { white-space: nowrap; }
    .content { padding: 14px; }
    .page-header { align-items: flex-start; flex-direction: column; }
    .form-actions { flex-direction: column; }
}
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { filter: brightness(.92); }
.btn-warning { background: #d69b19; color: #fff; }
.btn-small { padding: 7px 10px; font-size: 13px; white-space: nowrap; }
.actions-inline { display: flex; flex-wrap: wrap; gap: 7px; align-items: center; }
.actions-inline form { margin: 0; }
.danger-card { border-color: #e2b7b7; background: #fff8f8; }
.topbar-user a { color: inherit; }