:root {
    --bg: #f4f6f9;
    --panel: #ffffff;
    --panel-2: #f8fafc;
    --text: #1e293b;
    --muted: #64748b;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --success: #16a34a;
    --danger: #dc2626;
    --warning: #d97706;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

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

.sidebar {
    width: 240px;
    background: var(--panel);
    border-right: 1px solid var(--border);
    padding: 24px 16px;
    box-shadow: var(--shadow);
}

.sidebar h1 {
    font-size: 18px;
    margin: 0 0 24px;
    color: var(--text);
    font-weight: 700;
}

.menu a {
    display: block;
    padding: 10px 12px;
    border-radius: 8px;
    color: var(--text);
    margin-bottom: 4px;
}

.menu a:hover {
    background: var(--panel-2);
    text-decoration: none;
}

.menu a.active {
    background: #eff6ff;
    color: var(--accent);
    border-left: 3px solid var(--accent);
    font-weight: 600;
    text-decoration: none;
}

.content {
    flex: 1;
    padding: 28px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    gap: 16px;
}

.page-header h2 {
    margin: 0;
    font-size: 24px;
    font-weight: 700;
}

.card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
}

.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

th, td {
    padding: 12px 10px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
}

th {
    color: var(--muted);
    font-weight: 600;
    white-space: nowrap;
    background: var(--panel-2);
}

tr:hover td {
    background: #f8fafc;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: 8px;
    border: 1px solid transparent;
    cursor: pointer;
    font-size: 14px;
    text-decoration: none;
}

.btn:hover {
    text-decoration: none;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--accent-hover);
    color: #fff;
}

.btn-secondary {
    background: var(--panel);
    color: var(--text);
    border-color: var(--border);
}

.btn-secondary:hover {
    background: var(--panel-2);
    color: var(--text);
}

.btn-danger {
    background: #fef2f2;
    color: var(--danger);
    border-color: #fecaca;
}

.btn-danger:hover {
    background: #fee2e2;
    color: #b91c1c;
}

.btn-icon {
    width: 34px;
    height: 34px;
    padding: 0;
}

.actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
}

.badge-success {
    background: #dcfce7;
    color: #15803d;
}

.badge-danger {
    background: #fee2e2;
    color: #b91c1c;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    color: var(--muted);
    font-size: 14px;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    max-width: 520px;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text);
    font-size: 14px;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-group textarea {
    min-height: 90px;
    resize: vertical;
}

.alert {
    padding: 12px 14px;
    border-radius: 8px;
    margin-bottom: 16px;
}

.alert-success {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #166534;
}

.alert-error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
}

.login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(160deg, #eff6ff 0%, #f4f6f9 50%, #f8fafc 100%);
}

.login-card {
    width: 100%;
    max-width: 400px;
}

.muted {
    color: var(--muted);
}

.mono {
    font-family: Consolas, monospace;
    font-size: 12px;
    word-break: break-all;
    color: #475569;
}

.placeholder-box {
    text-align: center;
    padding: 60px 20px;
    color: var(--muted);
}

.placeholder-box h3 {
    margin-top: 0;
    color: var(--text);
}

.toggle-form {
    display: inline;
}

.empty {
    padding: 24px;
    text-align: center;
    color: var(--muted);
}

@media (max-width: 900px) {
    .layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .menu {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }

    .menu a {
        margin-bottom: 0;
    }
}