:root {
    --primary-color: #ffffff;
    --secondary-color: #1a1a1a;
    --tertiary-color: #f8f9fa;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --border-radius: 0.75rem;
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8eef5 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

a {
    text-decoration: none !important;
    color: var(--text-primary) !important;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-color) !important;
}

.bold {
    font-weight: 700 !important;
}

/* Round border utility */
.round-border {
    border: none;
    border-radius: var(--border-radius);
}

/* Navigation Cards */
.nav-card {
    padding: 0.875rem 1.25rem;
    margin: 0.5rem 0;
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.nav-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 3px;
    background: var(--accent-color);
    transform: scaleY(0);
    transition: transform var(--transition-base);
}

.nav-card:hover {
    background: var(--tertiary-color);
    color: var(--text-primary);
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.nav-card:hover::before {
    transform: scaleY(1);
}

.nav-card span {
    margin-right: 0.75rem;
    transition: transform var(--transition-base);
}

.nav-card:hover span {
    transform: scale(1.1);
}

.nav-card h6 {
    margin: 0;
    font-weight: 500;
    font-size: 0.95rem;
}

/* Active nav card */
.card-active {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    color: var(--primary-color) !important;
    box-shadow: var(--shadow-md);
}

.card-active h6,
.card-active span {
    color: var(--primary-color) !important;
}

.card-active::before {
    transform: scaleY(1);
    background: var(--primary-color);
}

.card-active:hover {
    background: linear-gradient(135deg, var(--accent-hover) 0%, var(--accent-color) 100%);
    transform: translateX(4px);
    box-shadow: var(--shadow-lg);
}

/* Card Backgrounds */
.dark-background {
    color: var(--primary-color) !important;
    background: linear-gradient(135deg, var(--secondary-color) 0%, #2d2d2d 100%);
    box-shadow: var(--shadow-lg);
}

.dark-background h1,
.dark-background h2,
.dark-background h3,
.dark-background h4,
.dark-background h5,
.dark-background h6,
.dark-background p,
.dark-background span {
    color: var(--primary-color) !important;
}

.light-background {
    color: var(--text-primary);
    background: var(--primary-color);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

/* Dashboard Layout */
.dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    padding: 1.5rem 0;
}

/* Main Content Cards */
.main-card {
    padding: 2rem;
    min-height: 8rem;
    margin-top: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.main-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), var(--success-color));
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.main-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.main-card:hover::after {
    transform: scaleX(1);
}

.main-card h5 {
    font-weight: 600;
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.main-card p {
    color: var(--text-secondary);
    margin-bottom: 0;
    font-size: 0.95rem;
}

/* Food Images */
.food-img {
    object-fit: contain;
    width: 50px;
    margin: 0 0.4rem;
    border-radius: 8px;
    transition: transform var(--transition-base);
}

.food-img:hover {
    transform: scale(1.1);
}

/* Sidebar Styles */
.sidebar {
    position: fixed;
    left: -450px;
    top: 0;
    max-width: 320px;
    background: var(--primary-color);
    transition: left var(--transition-slow), box-shadow var(--transition-base);
    min-height: 100vh;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    padding: 2rem 1.5rem;
    backdrop-filter: blur(10px);
}

.sidebar.show {
    left: 0;
    box-shadow: var(--shadow-xl);
}

.sidebar.hide {
    left: -450px;
}

/* Buttons */
.btn {
    padding: 0.625rem 2rem !important;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: all var(--transition-base);
    border: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

.btn-dark {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #2d2d2d 100%);
}

.btn-dark:hover {
    background: linear-gradient(135deg, #2d2d2d 0%, var(--secondary-color) 100%);
}

.wide-btn {
    width: 100%;
}

/* Login Page */
.login-page {
    top: 10rem;
    bottom: 0;
    right: 0;
    left: 0;
    margin: auto;
    position: relative;
    max-width: 480px;
    padding: 2rem;
    background: var(--primary-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
}

.login-page h1 {
    background: linear-gradient(135deg, var(--accent-color), var(--success-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

/* Menu Button (Hamburger) */
.menu-btn {
    top: 1rem;
    position: relative;
    min-height: 2rem;
    z-index: 1001;
}

.menu-btn .material-symbols-outlined {
    font-size: 2rem !important;
    cursor: pointer;
    transition: transform var(--transition-base);
    padding: 0.5rem;
    border-radius: 50%;
    background: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.menu-btn .material-symbols-outlined:hover {
    transform: rotate(90deg);
    box-shadow: var(--shadow-md);
}

.menu-btn .material-symbols-outlined:active {
    transform: rotate(90deg) scale(0.95);
}

/* Utility Classes */
.hidden {
    display: none !important;
}


/* Loader Animation */
.loader {
    width: 65px;
    aspect-ratio: 1;
    top: 4rem;
    position: relative;
    z-index: 1;
}

.loader:before,
.loader:after {
    content: "";
    position: absolute;
    border-radius: 50px;
    box-shadow: 0 0 0 3px inset var(--accent-color);
    animation: l4 2s ease-in-out infinite;
}

.loader:after {
    animation-delay: -1s;
    box-shadow: 0 0 0 3px inset var(--success-color);
}

@keyframes l4 {
    0%, 100% {
        inset: 0 35px 35px 0;
    }
    25% {
        inset: 35px 35px 0 0;
    }
    50% {
        inset: 35px 0 0 35px;
    }
    75% {
        inset: 0 0 35px 35px;
    }
}

/* Form Elements */
.form-select,
.form-control {
    border-radius: var(--border-radius);
    border: 2px solid var(--border-color);
    transition: all var(--transition-base);
    padding: 0.75rem 1rem;
}

.form-select:focus,
.form-control:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    outline: none;
}

/* Modal Enhancements */
.modal-content {
    border-radius: var(--border-radius);
    border: none;
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn var(--transition-slow);
}

.modal-header {
    border-bottom: 2px solid var(--border-color);
    padding: 1.5rem;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    border-top: 2px solid var(--border-color);
    padding: 1.5rem;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Dropdown Select Enhancement */
select.form-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%233b82f6' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 12px;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--text-primary);
}

h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

p {
    color: var(--text-secondary);
}

/* Responsive Breakpoints */
@media only screen and (min-width: 1200px) {
    .sidebar {
        display: block;
        position: relative;
        width: 100%;
        left: 0;
        min-height: 70vh;
        box-shadow: none;
    }

    .menu-btn {
        display: none !important;
    }

    .container {
        max-width: 1400px;
    }
}

@media only screen and (max-width: 768px) {
    .main-card {
        padding: 1.5rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .login-page {
        margin: 1rem;
        top: 5rem;
    }
}

/* Skeleton Loading Screens */
.skeleton {
    animation: skeleton-loading 1.5s infinite ease-in-out;
    background: linear-gradient(90deg, var(--tertiary-color) 25%, #e0e0e0 50%, var(--tertiary-color) 75%);
    background-size: 200% 100%;
    border-radius: var(--border-radius);
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.skeleton-card {
    height: 150px;
    margin-top: 1.5rem;
}

.skeleton-text {
    height: 20px;
    margin-bottom: 0.75rem;
}

.skeleton-title {
    height: 32px;
    width: 60%;
    margin-bottom: 1rem;
}

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}

/* Focus Visible for Accessibility */
:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--tertiary-color);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-hover);
}

/* Fade-in animation for page load */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

/* Material Icons Enhancement */
.material-symbols-outlined {
    font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
    user-select: none;
}

/* ===== NESTED TREE STRUCTURE ===== */