:root {
    --bg: #f5f7fa;
    --surface: #ffffff;
    --line: #d8dee8;
    --text: #172033;
    --muted: #657085;
    --primary: #155eef;
    --primary-dark: #0f46b7;
    --danger: #b42318;
    --success: #027a48;
    --warning: #b54708;
    --secondary: #475467;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text);
    background: var(--bg);
}
a { color: inherit; text-decoration: none; }
.app-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
}
.app-header-inner {
    max-width: 1180px;
    margin: 0 auto;
    min-height: 64px;
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 0 20px;
}
.brand { font-weight: 700; white-space: nowrap; }
.nav { display: flex; gap: 4px; flex: 1; }
.nav a {
    padding: 9px 12px;
    border-radius: 6px;
    color: var(--muted);
}
.nav a.active, .nav a:hover { background: #eef4ff; color: var(--primary-dark); }
.logout-form { margin: 0; }
.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 28px 20px 48px;
}
.page-title {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: flex-start;
    margin-bottom: 20px;
}
h1, h2, p { margin-top: 0; }
h1 { font-size: 28px; margin-bottom: 4px; }
h2 { font-size: 18px; margin-bottom: 4px; }
p { color: var(--muted); }
.card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
}
.card-header {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: flex-start;
    margin-bottom: 16px;
}
.stats-grid, .detail-grid, .form-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}
.stat-card span, .detail-grid span {
    display: block;
    color: var(--muted);
    font-size: 13px;
    margin-bottom: 8px;
}
.stat-card strong { font-size: 30px; }
.detail-grid strong { overflow-wrap: anywhere; }
.btn {
    border: 1px solid transparent;
    border-radius: 6px;
    padding: 9px 12px;
    font: inherit;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 38px;
}
.btn-sm { min-height: 30px; padding: 5px 8px; font-size: 13px; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: #fff; color: var(--secondary); border-color: var(--line); }
.btn-danger { background: var(--danger); color: #fff; }
.form-stack { display: grid; gap: 16px; }
.form-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.wide { grid-column: 1 / -1; }
label span, legend {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
}
.form-control {
    width: 100%;
    min-height: 40px;
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 9px 10px;
    font: inherit;
    background: #fff;
}
textarea.form-control { resize: vertical; }
.checkbox-grid {
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 14px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}
.checkbox-grid label { display: flex; align-items: center; gap: 8px; }
.form-actions, .actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}
.actions form { display: inline-flex; gap: 8px; margin: 0; }
.table-toolbar, .table-footer {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: end;
    margin-bottom: 12px;
}
.table-toolbar label { min-width: 180px; }
.table-responsive { overflow-x: auto; }
.table {
    width: 100%;
    border-collapse: collapse;
    min-width: 760px;
}
.table th, .table td {
    border-bottom: 1px solid var(--line);
    padding: 10px;
    text-align: left;
    vertical-align: middle;
}
.table-sort {
    border: 0;
    background: transparent;
    padding: 0;
    font: inherit;
    font-weight: 700;
    cursor: pointer;
}
.badge {
    display: inline-flex;
    border-radius: 999px;
    padding: 3px 9px;
    font-size: 12px;
    font-weight: 700;
}
.badge-success { color: var(--success); background: #ecfdf3; }
.badge-warning { color: var(--warning); background: #fffaeb; }
.badge-danger { color: var(--danger); background: #fef3f2; }
.badge-secondary { color: var(--secondary); background: #f2f4f7; }
.alert {
    border-radius: 8px;
    padding: 12px 14px;
    margin-bottom: 16px;
}
.alert-success { background: #ecfdf3; color: var(--success); }
.alert-danger { background: #fef3f2; color: var(--danger); }
.error { display: block; margin-top: 5px; color: var(--danger); }
.auth-shell {
    min-height: calc(100vh - 140px);
    display: grid;
    place-items: center;
}
.auth-card { width: min(440px, 100%); }
.log-box, .code-box {
    background: #101828;
    color: #f9fafb;
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
}
.empty { margin-bottom: 0; }
.danger-zone { margin-top: 20px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 20px 0; }
button:disabled { opacity: .45; cursor: not-allowed; }

@media (max-width: 760px) {
    .app-header-inner, .page-title, .card-header, .table-toolbar, .table-footer {
        align-items: stretch;
        flex-direction: column;
    }
    .nav { flex-wrap: wrap; }
    .stats-grid, .detail-grid, .form-grid, .checkbox-grid {
        grid-template-columns: 1fr;
    }
    .wide { grid-column: auto; }
}