:root {
    --sidebar-width: 280px;
    --topbar-height: 56px;
    
    /* Glassmorphism variables */
    --glass-bg: rgba(255, 255, 255, 0.15);
    --glass-bg-dark: rgba(33, 37, 41, 0.85);
    --glass-blur: blur(20px);
    --glass-border: 1px solid rgba(255, 255, 255, 0.18);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    
    /* Neumorphic variables */
    --neu-shadow-light: 8px 8px 16px rgba(255, 255, 255, 0.5);
    --neu-shadow-dark: -8px -8px 16px rgba(0, 0, 0, 0.1);
    --neu-shadow-inset: inset 2px 2px 5px rgba(0, 0, 0, 0.1), inset -2px -2px 5px rgba(255, 255, 255, 0.5);
    
    /* Transition */
    --transition-fast: all 0.2s ease;
    --transition-normal: all 0.3s ease;
}

body { 
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    min-height: 100vh;
}

.main-content {
    padding-top: calc(var(--topbar-height) + 1.5rem);
    padding-left: 1.5rem;
    padding-right: 1.5rem;
    padding-bottom: 1.5rem;
}

/* Glassmorphism Navbar */
.topbar {
    background: var(--glass-bg-dark) !important;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: var(--glass-border);
    box-shadow: var(--glass-shadow);
    transition: var(--transition-normal);
}

.topbar:hover {
    background: rgba(33, 37, 41, 0.9) !important;
}

/* Glassmorphism Sidebar */
@media (min-width: 768px) {
    .sidebar {
        position: fixed; top: 0; bottom: 0; left: 0;
        width: var(--sidebar-width);
        padding-top: var(--topbar-height);
        background: rgba(255, 255, 255, 0.25) !important;
        backdrop-filter: var(--glass-blur);
        -webkit-backdrop-filter: var(--glass-blur);
        border-right: var(--glass-border);
        box-shadow: var(--glass-shadow);
        display: flex;
        flex-direction: column;
        transition: var(--transition-normal);
    }
    .sidebar:hover {
        background: rgba(255, 255, 255, 0.35) !important;
    }
    .main-content {
        margin-left: var(--sidebar-width);
    }
}

@media (max-width: 767.98px) {
    .main-content { margin-left: 0; padding: 1rem; padding-top: calc(var(--topbar-height) + 1rem); }
    .sidebar.offcanvas-start {
        top: var(--topbar-height);
        height: calc(100% - var(--topbar-height));
        background: rgba(255, 255, 255, 0.95) !important;
        backdrop-filter: var(--glass-blur);
        -webkit-backdrop-filter: var(--glass-blur);
    }
}

.sidebar-heading { 
    font-size: .75rem; 
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sidebar .nav-link { 
    font-weight: 500;
    border-radius: 8px;
    margin: 2px 8px;
    transition: var(--transition-fast);
}

.sidebar .nav-link .bi { margin-right: 0.5rem; }

.sidebar .nav-link:hover {
    background: rgba(13, 110, 253, 0.1);
    transform: translateX(4px);
}

.sidebar .nav-link.active { 
    color: #fff; 
    background: linear-gradient(135deg, #0d6efd 0%, #0a58ca 100%);
    box-shadow: 0 4px 15px rgba(13, 110, 253, 0.4);
}

.submenu {
    padding-left: calc(1rem + 24px);
    font-size: .9em;
}
.submenu .nav-link {
    padding-top: .25rem;
    padding-bottom: .25rem;
    color: #6c757d;
    margin: 1px 8px;
}
.submenu .nav-link:hover, .submenu .nav-link.active {
    color: #0d6efd;
    background-color: rgba(13, 110, 253, 0.05);
}

/* Glassmorphism Cards */
.card {
    background: rgba(255, 255, 255, 0.7) !important;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 16px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.08),
        var(--neu-shadow-light),
        var(--neu-shadow-dark);
    transition: var(--transition-normal);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 
        0 12px 40px rgba(0, 0, 0, 0.12),
        12px 12px 24px rgba(255, 255, 255, 0.6),
        -12px -12px 24px rgba(0, 0, 0, 0.08);
}

.card-header {
    background: rgba(255, 255, 255, 0.5) !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 16px 16px 0 0 !important;
    font-weight: 600;
}

/* Glassmorphism Buttons */
.btn {
    border-radius: 10px;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-normal);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, #0d6efd 0%, #0a58ca 100%);
    border: none;
    box-shadow: 0 4px 15px rgba(13, 110, 253, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(13, 110, 253, 0.4);
}

.btn-outline-primary {
    border: 2px solid #0d6efd;
    background: transparent;
}

.btn-outline-primary:hover {
    background: rgba(13, 110, 253, 0.1);
    transform: translateY(-2px);
}

/* Glassmorphism Tables */
.table {
    background: rgba(255, 255, 255, 0.5);
    border-radius: 12px;
    overflow: hidden;
}

.table thead {
    background: rgba(13, 110, 253, 0.1);
}

.table tbody tr {
    transition: var(--transition-fast);
}

.table tbody tr:hover {
    background: rgba(13, 110, 253, 0.05);
    transform: scale(1.01);
}

/* Glassmorphism Forms */
.form-control, .form-select {
    background: rgba(255, 255, 255, 0.6) !important;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    transition: var(--transition-fast);
}

.form-control:focus, .form-select:focus {
    background: rgba(255, 255, 255, 0.8) !important;
    border-color: #0d6efd;
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.15);
}

/* Glassmorphism Alerts */
.alert {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
}

/* Glassmorphism Modals */
.modal-content {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
}

.modal-header {
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

.modal-footer {
    border-top: 1px solid rgba(255, 255, 255, 0.3);
}

/* Glassmorphism Pagination */
.page-link {
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: #0d6efd;
    transition: var(--transition-fast);
}

.page-link:hover {
    background: rgba(13, 110, 253, 0.1);
    transform: translateY(-2px);
}

.page-item.active .page-link {
    background: linear-gradient(135deg, #0d6efd 0%, #0a58ca 100%);
    border-color: #0d6efd;
}

/* Glassmorphism Badges */
.badge {
    border-radius: 8px;
    font-weight: 500;
}

/* Glassmorphism Dropdown */
.dropdown-menu {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

.dropdown-item {
    transition: var(--transition-fast);
}

.dropdown-item:hover {
    background: rgba(13, 110, 253, 0.1);
}

/* QR Scan Button */
.qr-scan-button { display: none; }
@media (max-width: 768px) {
    .qr-scan-button {
        display: block; 
        position: fixed; 
        bottom: 20px; 
        right: 20px;
        width: 60px; 
        height: 60px; 
        border-radius: 50%; 
        z-index: 1050;
        background: linear-gradient(135deg, #0d6efd 0%, #0a58ca 100%);
        border: none;
        box-shadow: 0 4px 20px rgba(13, 110, 253, 0.4);
        transition: var(--transition-fast);
    }
    .qr-scan-button:hover {
        transform: scale(1.1);
        box-shadow: 0 6px 25px rgba(13, 110, 253, 0.5);
    }
}

.profile-dropdown { position: relative; }
.profile-dropdown .dropdown-menu {
    position: absolute; top: 100%; right: 0; left: auto;
    margin-top: 0.25rem;
}

@media (max-width: 767.98px) {
    .navbar .navbar-nav { margin-left: auto; }
}

/* Utility Classes */
.glass-card {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 16px;
}

.text-gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Loading Animation */
@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.loading-shimmer {
    background: linear-gradient(90deg, 
        rgba(255, 255, 255, 0.1) 25%, 
        rgba(255, 255, 255, 0.3) 50%, 
        rgba(255, 255, 255, 0.1) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}