* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
    background: #f3f4f6;
    color: #1f2937;
}
.admin-shell { display: flex; min-height: 100vh; }

.sidebar {
    width: 220px;
    background: #111827;
    color: #e5e7eb;
    display: flex;
    flex-direction: column;
    padding: 1.25rem 0;
    flex-shrink: 0;
}
.sidebar-brand {
    font-weight: 700;
    font-size: 1.05rem;
    padding: 0 1.25rem 1.25rem;
    border-bottom: 1px solid #1f2937;
    margin-bottom: 0.5rem;
}
.sidebar nav ul { list-style: none; margin: 0; padding: 0; }
.sidebar nav li a {
    display: block;
    padding: 0.65rem 1.25rem;
    color: #d1d5db;
    text-decoration: none;
    font-size: 0.92rem;
}
.sidebar nav li a:hover { background: #1f2937; color: #fff; }
.sidebar nav li.active a { background: #2563eb; color: #fff; font-weight: 600; }

.sidebar-footer {
    margin-top: auto;
    padding: 1rem 1.25rem 0;
    border-top: 1px solid #1f2937;
}
.admin-user { font-size: 0.85rem; color: #9ca3af; margin-bottom: 0.4rem; }
.logout-link { color: #f87171; text-decoration: none; font-size: 0.85rem; }
.logout-link:hover { text-decoration: underline; }

.content { flex: 1; padding: 2rem 2.5rem; max-width: 720px; }
.page-title { font-size: 1.3rem; margin: 0 0 1.25rem; }

label { display: block; font-weight: 600; margin-top: 1rem; margin-bottom: 0.25rem; font-size: 0.9rem; }
input[type=text], input[type=password], input[type=number] {
    width: 100%;
    padding: 0.55rem 0.7rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 0.92rem;
}
.checkbox-row { display: flex; align-items: center; gap: 0.5rem; margin-top: 1rem; }

button, .btn {
    margin-top: 1.5rem;
    padding: 0.6rem 1.2rem;
    background: #2563eb;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.92rem;
    display: inline-block;
    text-decoration: none;
}
button:hover, .btn:hover { background: #1d4ed8; }
button.secondary, .btn.secondary { background: #6b7280; margin-left: 0.5rem; }
button.secondary:hover, .btn.secondary:hover { background: #4b5563; }

.msg { padding: 0.6rem 0.9rem; border-radius: 6px; margin-bottom: 1.25rem; font-size: 0.9rem; }
.msg.success { background: #dcfce7; color: #166534; }
.msg.error { background: #fee2e2; color: #991b1b; }
.hint { font-size: 0.8rem; color: #6b7280; margin-top: 0.3rem; }

.card {
    background: #fff;
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #111827;
}
.login-box {
    background: #fff;
    padding: 2rem;
    border-radius: 12px;
    width: 320px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}
.login-box h1 { font-size: 1.15rem; margin: 0 0 1.25rem; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; margin-top: 1rem; }
.stat-card { background: #fff; border-radius: 10px; padding: 1.1rem; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
.stat-card .stat-label { font-size: 0.8rem; color: #6b7280; }
.stat-card .stat-value { font-size: 1.2rem; font-weight: 700; margin-top: 0.25rem; }
.stat-value.ok { color: #166534; }
.stat-value.warn { color: #b45309; }