/* ==========================================================================
   SIDEBAR — Desain Baru (Rounded, Animated, Gradient Active)
   ========================================================================== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: var(--sidebar-width);
    background: linear-gradient(180deg, #0f172a 0%, #131f34 100%);
    color: var(--sidebar-text);
    z-index: 9999;
    overflow-y: auto;
    overflow-x: hidden;
    transition: transform var(--transition-base);
    box-shadow: 4px 0 20px rgba(0,0,0,0.08);
    display: flex;
    flex-direction: column;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.1) transparent;
}
.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.1);
    border-radius: 3px;
}

.sidebar.collapsed-total {
    transform: translateX(-100%);
}

/* ===== HEADER ===== */
.sidebar-header {
    height: var(--header-height);
    min-height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 16px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.sidebar-logo,
.logo-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    text-decoration: none;
}
.logo-img-fix {
    height: 42px;
    width: auto;
    max-width: 90%;
    object-fit: contain;
}

/* ===== NAV ===== */
.sidebar-nav {
    padding: 20px 12px 24px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

.nav-group-wrapper { display: flex; flex-direction: column; }

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: var(--radius-lg);
    color: var(--sidebar-text-muted);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    transition: all var(--transition-fast);
    white-space: nowrap;
    position: relative;
    cursor: pointer;
    border: none;
    background: transparent;
    font-family: var(--font-sans);
}

.nav-item i {
    width: 22px;
    font-size: 1.05rem;
    text-align: center;
    flex-shrink: 0;
}
.nav-item span { flex: 1; }

.nav-item:hover {
    background: var(--sidebar-hover);
    color: #ffffff;
    transform: translateX(3px);
}

.nav-item.active {
    background: linear-gradient(135deg, var(--sidebar-active), var(--primary-dark));
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

/* ===== SUBMENU ===== */
.submenu {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height var(--transition-slow), opacity var(--transition-base), padding var(--transition-base);
    margin-left: 14px;
    border-left: 1px solid rgba(255,255,255,0.08);
    padding-left: 6px;
}

.submenu.is-open {
    max-height: 500px;
    opacity: 1;
    padding: 6px 0 6px 6px;
}

.sub-item {
    padding: 10px 12px 10px 14px;
    font-size: 0.78rem;
    text-transform: none;
    letter-spacing: normal;
    border-radius: var(--radius-md);
    font-weight: 500;
}
.sub-item i {
    font-size: 0.9rem;
    width: 18px;
}

.parent-toggle-btn .arrow-icon {
    margin-left: auto;
    font-size: 0.72rem;
    transition: transform var(--transition-base);
}

/* ===== MOBILE ===== */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        box-shadow: none;
    }
    .sidebar.mobile-open {
        transform: translateX(0);
        box-shadow: 4px 0 30px rgba(0,0,0,0.35);
    }
    .sidebar.collapsed-total {
        transform: translateX(-100%);
    }
}