:root {
    --nls-green: #1b7f4d;
    --nls-green-dark: #14633b;
    --nls-accent: #5fd39a;
    --sidebar-w: 264px;
    --topbar-h: 60px;
    --sidebar-bg: #0e3a24;
    --sidebar-bg2: #0a2c1b;
    --sidebar-fg: #cfe9da;
    --sidebar-fg-muted: #7fb499;
}

body { background: #eef1f4; }
body.has-shell { background: #eef1f4; }

/* ---------- App shell ---------- */
.app-shell { min-height: 100vh; }

.app-sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    width: var(--sidebar-w);
    background: linear-gradient(180deg, var(--sidebar-bg), var(--sidebar-bg2));
    color: var(--sidebar-fg);
    display: flex;
    flex-direction: column;
    z-index: 1040;
    overflow-y: auto;
    transition: transform .25s ease;
}

.app-main {
    margin-left: var(--sidebar-w);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left .25s ease;
}

/* Collapsed (desktop) */
body.sidebar-hidden .app-sidebar { transform: translateX(-100%); }
body.sidebar-hidden .app-main { margin-left: 0; }

/* ---------- Sidebar brand ---------- */
.sidebar-brand {
    display: flex;
    align-items: center;
    gap: .55rem;
    min-height: var(--topbar-h);
    padding: 0 1.15rem;
    font-weight: 700;
    font-size: 1.05rem;
    color: #fff;
    text-decoration: none;
    border-bottom: 1px solid rgba(255,255,255,.08);
    position: sticky;
    top: 0;
    background: var(--sidebar-bg);
    z-index: 1;
}
.sidebar-brand:hover { color: #fff; }
.sidebar-brand img { height: 30px; width: auto; }
.sidebar-brand i { font-size: 1.3rem; color: var(--nls-accent); }

/* ---------- Sidebar nav ---------- */
.sidebar-nav { padding: .5rem .6rem 1.5rem; }
.nav-section {
    font-size: .68rem;
    text-transform: uppercase;
    letter-spacing: .09em;
    color: var(--sidebar-fg-muted);
    padding: .95rem .7rem .35rem;
}
.app-sidebar .nav-link {
    display: flex;
    align-items: center;
    gap: .7rem;
    color: var(--sidebar-fg);
    padding: .5rem .7rem;
    margin-bottom: 2px;
    border-radius: 8px;
    font-size: .92rem;
    white-space: nowrap;
}
.app-sidebar .nav-link i { font-size: 1.05rem; width: 1.2rem; text-align: center; opacity: .9; }
.app-sidebar .nav-link:hover { background: rgba(255,255,255,.08); color: #fff; }
.app-sidebar .nav-link.active {
    background: rgba(255,255,255,.13);
    color: #fff;
    box-shadow: inset 3px 0 0 var(--nls-accent);
}

/* ---------- Top bar ---------- */
.app-topbar {
    height: var(--topbar-h);
    background: #fff;
    border-bottom: 1px solid #e3e7eb;
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: 0 1rem;
    position: sticky;
    top: 0;
    z-index: 1030;
}
.topbar-title { font-weight: 600; color: #1f2a37; }
.btn-icon {
    background: transparent;
    border: none;
    font-size: 1.4rem;
    line-height: 1;
    color: #374151;
    padding: .2rem .5rem;
    border-radius: 8px;
}
.btn-icon:hover { background: #f0f2f5; }
.topbar-user {
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    color: #374151;
    text-decoration: none;
    padding: .35rem .6rem;
    border-radius: 8px;
}
.topbar-user:hover { background: #f0f2f5; color: #111827; }
.topbar-user i { font-size: 1.2rem; }

/* ---------- Content + footer ---------- */
.app-content { flex: 1; padding: 1.4rem 1.6rem; }
.nls-footer { background: #fff; border-top: 1px solid #e3e7eb; }

/* ---------- Backdrop (mobile overlay) ---------- */
.sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.45);
    z-index: 1035;
    opacity: 0;
    visibility: hidden;
    transition: opacity .2s ease;
}
body.sidebar-open .sidebar-backdrop { opacity: 1; visibility: visible; }

/* ---------- Responsive: sidebar overlays on small screens ---------- */
@media (max-width: 991.98px) {
    .app-main { margin-left: 0; }
    .app-sidebar { transform: translateX(-100%); box-shadow: 0 0 40px rgba(0,0,0,.25); }
    body.sidebar-open .app-sidebar { transform: translateX(0); }
    .app-content { padding: 1.1rem; }
}

/* ---------- Shared component styles ---------- */
.card { border: none; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.card-header { background: #fff; font-weight: 600; border-bottom: 1px solid #eef1f4; }
.btn-nls { background: var(--nls-green); color: #fff; }
.btn-nls:hover { background: var(--nls-green-dark); color: #fff; }
.section-title { color: var(--nls-green); border-left: 4px solid var(--nls-green); padding-left: .5rem; margin: 1rem 0 .75rem; }
.matrix-input { width: 56px; text-align: center; }
.grid-input { min-width: 110px; }