* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, "Segoe UI", "Hiragino Sans", Meiryo, sans-serif;
    background: #f4f5f7;
    color: #1f2328;
}

.layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 220px;
    background: #1f2937;
    color: #e5e7eb;
    display: flex;
    flex-direction: column;
    padding: 16px 0;
    flex-shrink: 0;
}

.sidebar-brand {
    font-weight: bold;
    font-size: 1.1rem;
    padding: 8px 20px 20px;
}

.sidebar a {
    color: #e5e7eb;
    text-decoration: none;
    padding: 10px 20px;
    display: block;
}

.sidebar a:hover,
.sidebar a.active {
    background: #374151;
}

.logout-form {
    margin-top: auto;
    padding: 10px 20px;
}

.logout-form button {
    width: 100%;
    background: none;
    border: 1px solid #4b5563;
    color: #e5e7eb;
    padding: 8px;
    border-radius: 4px;
    cursor: pointer;
}

.content {
    flex: 1;
    padding: 24px 32px;
    overflow-x: auto;
}

h1 {
    margin-top: 0;
}

.cards {
    display: flex;
    gap: 16px;
    margin: 16px 0;
}

.card {
    background: #fff;
    border-radius: 8px;
    padding: 16px 20px;
    min-width: 200px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.card-alert {
    border-left: 4px solid #dc2626;
}

.card-label {
    font-size: 0.85rem;
    color: #6b7280;
}

.card-value {
    font-size: 2rem;
    font-weight: bold;
}

.card-sub {
    font-size: 0.8rem;
    color: #6b7280;
}

.note {
    color: #6b7280;
    font-size: 0.9rem;
}

.screenshot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
    margin: 16px 0;
}

.screenshot-card {
    display: block;
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    text-decoration: none;
    color: inherit;
}

.screenshot-card img {
    width: 100%;
    height: 140px;
    object-fit: cover;
    display: block;
    background: #f3f4f6;
}

.screenshot-meta {
    padding: 8px 10px;
    font-size: 0.8rem;
    color: #6b7280;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.data-table th,
.data-table td {
    text-align: left;
    padding: 10px 14px;
    border-bottom: 1px solid #e5e7eb;
}

.data-table th {
    background: #f9fafb;
    font-size: 0.85rem;
    color: #6b7280;
}

.badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 999px;
    font-size: 0.8rem;
    background: #e5e7eb;
    color: #374151;
}

.badge-online {
    background: #dcfce7;
    color: #166534;
}

.badge-offline {
    background: #fee2e2;
    color: #991b1b;
}

.filter-form,
.alert-rule-form {
    display: flex;
    gap: 16px;
    align-items: flex-end;
    margin: 16px 0;
    flex-wrap: wrap;
}

.alert-rule-form {
    flex-direction: column;
    align-items: stretch;
    max-width: 420px;
}

.filter-form label,
.alert-rule-form label {
    display: flex;
    flex-direction: column;
    font-size: 0.85rem;
    color: #374151;
    gap: 4px;
}

input,
select,
textarea,
button {
    font-family: inherit;
    font-size: 0.95rem;
    padding: 6px 10px;
    border: 1px solid #d1d5db;
    border-radius: 4px;
}

button {
    background: #2563eb;
    color: #fff;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #1d4ed8;
}

.btn-link {
    display: inline-block;
    background: #2563eb;
    color: #fff;
    text-decoration: none;
    padding: 6px 14px;
    border-radius: 4px;
}

.btn-link:hover {
    background: #1d4ed8;
}

.alert {
    padding: 10px 14px;
    border-radius: 6px;
    margin-bottom: 16px;
}

.alert-success {
    background: #dcfce7;
    color: #166534;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
}

.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: #f4f5f7;
}

.login-form {
    background: #fff;
    padding: 32px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 320px;
}

.login-form label {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 0.9rem;
}