:root {
    --gmk-sidebar: #16202c;
    --gmk-sidebar-text: #b7c3d0;
    --gmk-accent: #1f7a8c;
    --gmk-bg: #f3f5f8;
}

body { background: var(--gmk-bg); }

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

.gmk-sidebar {
    width: 240px;
    flex-shrink: 0;
    background: var(--gmk-sidebar);
    color: var(--gmk-sidebar-text);
}
.gmk-brand {
    display: block;
    padding: 1.1rem 1.25rem;
    color: #fff;
    font-weight: 600;
    font-size: 1.05rem;
    text-decoration: none;
    border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.gmk-nav-title {
    padding: 1rem 1.25rem .35rem;
    font-size: .7rem;
    letter-spacing: .08em;
    text-transform: uppercase;
    opacity: .6;
}
.gmk-nav a {
    display: flex;
    gap: .65rem;
    padding: .5rem 1.25rem;
    color: var(--gmk-sidebar-text);
    text-decoration: none;
}
.gmk-nav a:hover { background: rgba(255, 255, 255, .06); color: #fff; }
.gmk-nav a.active { background: var(--gmk-accent); color: #fff; }

.gmk-main { flex: 1; min-width: 0; }
.gmk-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: .75rem 1.5rem;
    background: #fff;
    border-bottom: 1px solid #e3e7ec;
}
.gmk-topbar h1 { margin: 0; font-size: 1.15rem; font-weight: 600; }
.gmk-content { padding: 1.5rem; }

.gmk-stat { font-size: 2rem; font-weight: 600; line-height: 1.1; font-variant-numeric: tabular-nums; }

.gmk-login {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    background: var(--gmk-sidebar);
}
.gmk-login .card { width: 100%; max-width: 380px; }

@media (max-width: 768px) {
    .gmk-shell { flex-direction: column; }
    .gmk-sidebar { width: 100%; }
    .gmk-content { padding: 1rem; }
}