:root {
    --bg: #f4f6f8;
    --panel: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --warn: #d97706;
    --success: #16a34a;
    --radius: 8px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.brand { font-weight: 700; font-size: 1.1rem; }

.mainnav a {
    color: var(--muted);
    text-decoration: none;
    margin-right: 18px;
    padding: 6px 4px;
    border-bottom: 2px solid transparent;
}

.mainnav a.active,
.mainnav a:hover {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.userbox { display: flex; align-items: center; gap: 12px; color: var(--muted); }
.userbox a { color: var(--primary); text-decoration: none; }

.content { max-width: 1100px; margin: 0 auto; padding: 24px; }

h1 { margin-top: 0; }

.flash {
    padding: 10px 14px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 0.95rem;
}
.flash-success { background: #dcfce7; color: #166534; }
.flash-error { background: #fee2e2; color: #991b1b; }

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
}
.stat-value { font-size: 1.8rem; font-weight: 700; }
.stat-label { color: var(--muted); font-size: 0.85rem; margin-top: 4px; }
.stat-warn .stat-value { color: var(--warn); }
.stat-danger .stat-value { color: var(--danger); }

.panel-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
@media (max-width: 800px) {
    .panel-grid { grid-template-columns: 1fr; }
}

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
}
.panel-wide { grid-column: 1 / -1; }

.panel h2 { margin-top: 0; font-size: 1.1rem; }

table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; }

.muted { color: var(--muted); font-size: 0.9rem; }

form label {
    display: block;
    margin-bottom: 12px;
    font-size: 0.88rem;
    color: var(--muted);
}
form input, form select {
    display: block;
    width: 100%;
    margin-top: 4px;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.95rem;
    color: var(--text);
}
button {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 10px 18px;
    border-radius: 6px;
    font-size: 0.95rem;
    cursor: pointer;
}
button:hover { background: var(--primary-dark); }

.inline-search { display: flex; gap: 8px; margin-bottom: 16px; }
.inline-search input { flex: 1; }
.inline-search button { flex-shrink: 0; }

.activity-list { list-style: none; margin: 0; padding: 0; font-size: 0.9rem; }
.activity-list li { padding: 8px 0; border-bottom: 1px solid var(--border); }
.activity-list .muted { display: block; font-size: 0.78rem; margin-top: 2px; }

.filter-row { margin-bottom: 16px; }
.filter-row a {
    display: inline-block;
    margin-right: 8px;
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--muted);
    text-decoration: none;
    font-size: 0.85rem;
}
.filter-row a.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    background: #e5e7eb;
    color: var(--muted);
    font-size: 0.78rem;
}
.badge-warn { background: #fef3c7; color: #92400e; }
.badge-danger { background: #fee2e2; color: #991b1b; }

.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}
.login-box {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    width: 340px;
}
.login-box h1 { margin: 0 0 4px; font-size: 1.4rem; }
.login-box .subtitle { color: var(--muted); margin: 0 0 20px; font-size: 0.9rem; }
.login-box button { width: 100%; margin-top: 8px; }