:root {
    --bg: #f5f6f8;
    --card-bg: #ffffff;
    --text: #1f2430;
    --muted: #6b7280;
    --border: #e3e5ea;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --success: #16a34a;
    --radius: 10px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.topbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
}
.topbar-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}
.brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text);
    text-decoration: none;
}
.nav a {
    color: var(--muted);
    text-decoration: none;
    margin-left: 16px;
    font-size: 0.95rem;
}
.nav a:hover { color: var(--primary); }

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px 20px 60px;
}

h1 { font-size: 1.6rem; margin-bottom: 18px; }
h2 { font-size: 1.15rem; margin-top: 0; }
h3 { font-size: 1rem; color: var(--muted); }

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 20px;
}
.card.narrow { max-width: 420px; }

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
@media (max-width: 800px) {
    .grid-2 { grid-template-columns: 1fr; }
}

.stat-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin-bottom: 24px;
}
@media (max-width: 800px) {
    .stat-row { grid-template-columns: repeat(2, 1fr); }
}
.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.stat-label { font-size: 0.8rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.03em; }
.stat-value { font-size: 1.5rem; font-weight: 700; }
.stat-positive .stat-value { color: var(--success); }
.stat-negative .stat-value { color: var(--danger); }

form label {
    display: block;
    margin-bottom: 12px;
    font-size: 0.9rem;
    color: var(--muted);
}
form input[type=text],
form input[type=password],
form input[type=number],
form input[type=date],
form input[type=file],
form select {
    display: block;
    width: 100%;
    margin-top: 4px;
    padding: 9px 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    color: var(--text);
    background: #fff;
}

.btn, .btn-small {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 10px 16px;
    font-size: 0.95rem;
    cursor: pointer;
    text-decoration: none;
}
.btn:hover, .btn-small:hover { background: var(--primary-dark); }
.btn-small { padding: 6px 10px; font-size: 0.85rem; }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #b91c1c; }

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

.actions { display: flex; gap: 8px; align-items: flex-start; }
.inline-form { display: inline; }
.inline-form.stacked { display: flex; gap: 6px; margin-top: 6px; }
.inline-form.stacked input[type=text] { width: auto; margin: 0; }

details summary { cursor: pointer; }

.alert {
    padding: 10px 14px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 0.92rem;
}
.alert-error { background: #fee2e2; color: #991b1b; }
.alert-success { background: #dcfce7; color: #166534; }
.alert-box { border-left: 4px solid var(--primary); }

.hint { color: var(--muted); font-size: 0.85rem; }

.footer {
    text-align: center;
    color: var(--muted);
    font-size: 0.8rem;
    padding: 20px;
}

code {
    background: #f1f2f4;
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 0.85em;
}