:root {
    --p:           #6C3CE1;
    --s:           #00D4FF;
    --g:           linear-gradient(135deg, #6C3CE1, #00D4FF);
    --glow:        #a78bfa;
    --dark:        #0b0817;
    --dark2:       #120b24;
    --surface:     rgba(255,255,255,0.04);
    --border:      rgba(255,255,255,0.06);
    --text:        #e2e8f0;
    --muted:       #64748b;
    --navbar-h:    64px;
    --footer-h:    56px;
    --sidebar-w:   220px;
    --sidebar-collapsed-w: 60px;
}

html, body {
    height: 100%;
    margin: 0;
    font-family: 'Space Grotesk', 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--dark);
    color: var(--text);
}

/* ==================== NAVBAR ==================== */
.top-navbar {
    background: var(--dark);
    box-shadow: 0 1px 0 var(--border);
    padding: 0 24px;
    min-height: var(--navbar-h);
    z-index: 1030;
}

.nav-logo {
    width: 36px;
    height: 36px;
    object-fit: cover;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.06);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.nav-logo:hover { transform: scale(1.1); border-color: rgba(167,139,250,0.3); }

.brand-text {
    font-weight: 700;
    font-size: 1.3rem;
    letter-spacing: -0.3px;
    background: var(--g);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.brand-tagline {
    font-size: 0.68rem;
    font-weight: 400;
    color: rgba(255,255,255,0.25);
    letter-spacing: 0.6px;
    border-left: 1px solid var(--border);
    padding-left: 12px;
    font-family: 'Segoe UI', system-ui, sans-serif;
}

/* ==================== MAIN LAYOUT ==================== */
.main-container {
    height: calc(100vh - var(--navbar-h) - var(--footer-h));
}

/* ==================== SIDEBAR ==================== */
.sidebar {
    background: linear-gradient(180deg, var(--dark) 0%, var(--dark2) 100%);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.04) transparent;
    border-right: 1px solid var(--border);
    position: relative;
    transition: width 0.35s cubic-bezier(0.23, 1, 0.32, 1), min-width 0.35s cubic-bezier(0.23, 1, 0.32, 1);
    width: var(--sidebar-w);
    min-width: var(--sidebar-w);
}

.sidebar::-webkit-scrollbar { width: 3px; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.04); border-radius: 4px; }

.sidebar.collapsed {
    flex: 0 0 var(--sidebar-collapsed-w) !important;
    max-width: var(--sidebar-collapsed-w) !important;
    width: var(--sidebar-collapsed-w);
    min-width: var(--sidebar-collapsed-w);
}

.sidebar.collapsed ~ .content-area {
    flex: 0 0 calc(100% - var(--sidebar-collapsed-w)) !important;
    max-width: calc(100% - var(--sidebar-collapsed-w)) !important;
}

/* ─── HEADER ─── */
.sidebar-header {
    padding: 18px 16px 14px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--muted);
    font-weight: 600;
    font-size: 0.6rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    white-space: nowrap;
    overflow: hidden;
    position: relative;
}

.sidebar-header i { font-size: 0.75rem; opacity: 0.35; flex-shrink: 0; }

.sidebar-toggle {
    background: none;
    border: none;
    color: rgba(255,255,255,0.15);
    cursor: pointer;
    padding: 4px;
    margin-left: auto;
    flex-shrink: 0;
    transition: transform 0.35s ease, color 0.2s ease;
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-toggle:hover { color: var(--glow); }

.sidebar.collapsed .sidebar-toggle {
    transform: rotate(180deg);
}

/* ─── NAV ─── */
.sidebar-nav { padding: 8px 0; flex: 1; overflow: hidden; }
.sidebar-nav .nav-item { margin: 1px 0; }

.sidebar-nav .nav-link {
    color: rgba(255,255,255,0.3) !important;
    padding: 10px 20px;
    font-size: 0.82rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.25s ease;
    position: relative;
    border: none;
    white-space: nowrap;
    overflow: hidden;
}

.sidebar-nav .nav-link i {
    font-size: 0.9rem;
    width: 20px;
    text-align: center;
    color: rgba(255,255,255,0.12);
    transition: all 0.25s ease;
    flex-shrink: 0;
}

.sidebar-nav .nav-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%) scaleY(0);
    width: 2.5px;
    height: 20px;
    border-radius: 0 2px 2px 0;
    background: var(--g);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.sidebar-nav .nav-link:hover {
    color: rgba(255,255,255,0.6) !important;
    background: rgba(255,255,255,0.02);
    padding-left: 24px;
}

.sidebar-nav .nav-link:hover i {
    color: var(--glow);
    transform: translateX(3px);
}

.sidebar-nav .nav-link:hover::before {
    transform: translateY(-50%) scaleY(1);
}

.sidebar-nav .nav-link.active {
    background: linear-gradient(90deg, rgba(106,17,203,0.1) 0%, transparent 100%) !important;
    color: #fff !important;
    font-weight: 600;
}

.sidebar-nav .nav-link.active i {
    color: var(--glow);
}

.sidebar-nav .nav-link.active::before {
    transform: translateY(-50%) scaleY(1);
    box-shadow: 0 0 12px rgba(106,17,203,0.4);
}

.sidebar-nav .nav-link.active::after {
    content: '';
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--g);
    box-shadow: 0 0 8px rgba(106,17,203,0.5);
    animation: pulseDot 2s ease-in-out infinite;
}

@keyframes pulseDot {
    0%, 100% { opacity: 1; transform: translateY(-50%) scale(1); }
    50% { opacity: 0.5; transform: translateY(-50%) scale(0.7); }
}

.sidebar.collapsed .nav-link { padding: 10px 0; justify-content: center; gap: 0; }
.sidebar.collapsed .nav-link:hover { padding-left: 0; }
.sidebar.collapsed .nav-link i { margin: 0; }
.sidebar.collapsed .nav-link.active::after { display: none; }

/* ─── DIVIDER ─── */
.nav-divider {
    padding: 18px 20px 4px;
    list-style: none;
    overflow: hidden;
    white-space: nowrap;
}

.nav-divider span {
    font-size: 0.55rem;
    text-transform: uppercase;
    letter-spacing: 1.8px;
    color: rgba(255,255,255,0.2);
    font-weight: 700;
    transition: opacity 0.25s ease;
}

.sidebar.collapsed .nav-divider {
    padding: 14px 0 4px;
    text-align: center;
}

.sidebar.collapsed .nav-divider span {
    font-size: 0.4rem;
    letter-spacing: 0;
}

/* ─── SIDEBAR TEXT (for collapsed) ─── */
.sidebar-text {
    transition: opacity 0.2s ease;
}

.sidebar.collapsed .sidebar-text {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

.sidebar.collapsed .sidebar-header .sidebar-text {
    opacity: 0;
    width: 0;
}

/* ==================== CONTENT AREA ==================== */
.content-area {
    position: relative;
    background: linear-gradient(135deg, #0a0a14 0%, #0f0a1e 50%, #0a0f1e 100%);
    height: 100%;
    overflow: hidden;
}

/* Ambient glow behind content */
.content-area::before {
    content: '';
    position: absolute;
    top: -30%;
    left: -20%;
    width: 60%;
    height: 80%;
    background: radial-gradient(ellipse, rgba(106,17,203,0.08) 0%, transparent 70%);
    animation: ambientGlow 8s ease-in-out infinite alternate;
    pointer-events: none;
    z-index: 0;
}

.content-area::after {
    content: '';
    position: absolute;
    bottom: -20%;
    right: -10%;
    width: 50%;
    height: 60%;
    background: radial-gradient(ellipse, rgba(59,130,246,0.06) 0%, transparent 70%);
    animation: ambientGlow 10s ease-in-out infinite alternate-reverse;
    pointer-events: none;
    z-index: 0;
}

@keyframes ambientGlow {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(30px, -20px) scale(1.1); }
}

/* Gradient border glow on the content area */
.content-area .glow-border {
    position: absolute;
    inset: 0;
    border-radius: 0;
    pointer-events: none;
    z-index: 1;
    box-shadow:
        inset 0 1px 0 rgba(106,17,203,0.06),
        0 0 60px rgba(106,17,203,0.03);
}

#contentFrame {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
    transition: opacity 0.4s ease;
    opacity: 1;
    position: relative;
    z-index: 2;
}

/* ==================== LOADING ==================== */
.loading-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10,10,20,0.5);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    z-index: 20;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.loading-overlay.visible { opacity: 1; }

.loading-spinner {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2.5px solid rgba(255,255,255,0.04);
    border-top-color: var(--glow);
    border-bottom-color: var(--s);
    animation: spin 0.8s cubic-bezier(0.6, 0, 0.4, 1) infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ==================== FOOTER ==================== */
.footer {
    background: var(--dark);
    color: var(--muted);
    padding: 0 24px;
    min-height: var(--footer-h);
    display: flex;
    align-items: center;
    font-size: 0.76rem;
    border-top: 1px solid var(--border);
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 10%;
    right: 10%;
    height: 1px;
    background: var(--g);
    opacity: 0.15;
}

.footer-link {
    cursor: pointer;
    transition: all 0.2s;
    color: var(--muted);
    text-decoration: none;
}

.footer-link:hover { color: var(--glow); }

.footer-sep {
    color: rgba(255,255,255,0.04);
    margin: 0 8px;
}

.text-secondary-emphasis { color: rgba(255,255,255,0.15) !important; }
.text-light { color: rgba(255,255,255,0.7) !important; }

/* ==================== UAC LINK ==================== */
.uac-link {
    display: flex !important;
    align-items: center !important;
    gap: 10px !important;
    color: rgba(255,255,255,0.25) !important;
    transition: color 0.25s ease !important;
    padding: 6px 16px !important;
}

.uac-link:hover { color: rgba(167,139,250,0.6) !important; }

/* ==================== RESPONSIVE ==================== */

/* Adjust col widths when sidebar collapses */
.sidebar.collapsed ~ .content-area {
    flex: 0 0 calc(100% - var(--sidebar-collapsed-w));
    max-width: calc(100% - var(--sidebar-collapsed-w));
}

@media (min-width: 992px) {
    .sidebar.collapsed { flex: 0 0 var(--sidebar-collapsed-w); max-width: var(--sidebar-collapsed-w); }
}

@media (max-width: 991px) {
    .sidebar { min-height: auto; width: 100%; min-width: 0; }
    .sidebar.collapsed { width: 100%; min-width: 0; }
    .sidebar.collapsed .sidebar-text { opacity: 1; width: auto; overflow: visible; }
    .sidebar.collapsed .nav-link { padding: 10px 20px; justify-content: flex-start; gap: 12px; }
    .sidebar.collapsed .nav-link:hover { padding-left: 24px; }
    .sidebar.collapsed .nav-link i { margin: 0; }
    .sidebar.collapsed .nav-link.active::after { display: block; }
    .sidebar.collapsed .nav-divider { padding: 18px 20px 4px; text-align: left; }
    .sidebar.collapsed .nav-divider span { font-size: 0.55rem; letter-spacing: 1.8px; }
    .sidebar.collapsed .sidebar-header .sidebar-text { opacity: 1; width: auto; }
    .sidebar.collapsed ~ .content-area { flex: 0 0 100%; max-width: 100%; }
    .sidebar-toggle { display: none; }
    .main-container { height: auto; }
    .content-area { height: auto; min-height: 60vh; }
}

@media (max-width: 767px) {
    .sidebar {
        max-height: 220px;
        border-bottom: 1px solid var(--border);
        overflow-y: auto;
        border-right: none;
    }
    .sidebar-nav .nav-link { padding: 7px 16px; font-size: 0.78rem; }
    .sidebar-nav .nav-link i { font-size: 0.85rem; width: 16px; }
    .sidebar-header { padding: 12px 16px 10px; font-size: 0.55rem; }
    .nav-divider { padding: 12px 16px 2px; }
    .nav-divider span { font-size: 0.5rem; }
    .main-container { height: auto; }
    .content-area { min-height: calc(100vh - var(--navbar-h) - 220px - var(--footer-h)); }
    .footer { padding: 0 16px; font-size: 0.7rem; }
    .brand-tagline { display: none !important; }
}

@media (max-width: 575px) {
    :root { --navbar-h: 56px; --footer-h: 48px; }
    .top-navbar { padding: 0 12px; min-height: var(--navbar-h); }
    .brand-text { font-size: 1rem; }
    .nav-logo { width: 30px; height: 30px; }
    .sidebar { max-height: 190px; }
    .sidebar-nav .nav-link { padding: 5px 12px; font-size: 0.72rem; gap: 8px; }
    .sidebar-nav .nav-link i { font-size: 0.75rem; width: 14px; }
    .content-area { min-height: calc(100vh - var(--navbar-h) - 190px - var(--footer-h)); }
    .footer { font-size: 0.6rem; padding: 0 10px; min-height: var(--footer-h); }
    .footer-sep { margin: 0 4px; }
}