:root {
    --primary-bg: #0f172a;
    --secondary-bg: #1e293b;
    --accent-color: #3b82f6;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --hover-bg: #334155;
    --primary-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --accent-hover: #2563eb;
    --card-bg: #1e293b;
    --border-color: #334155;
    --sidebar-width: 250px;
    --navbar-height: 70px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background: var(--primary-bg);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Navbar */
.navbar {
    background: var(--primary-gradient);
    backdrop-filter: blur(10px);
    height: var(--navbar-height);
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}

.menu-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: background 0.2s;
    display: block;
}

.menu-btn:hover {
    background: var(--hover-bg);
}

.logo-icon {
    width: 35px;
    height: 35px;
    background: var(--accent-color);
    border-radius: 8px;
    display: grid;
    place-items: center;
    color: white;
    font-weight: bold;
    flex-shrink: 0;
}

.logo-icon i {
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    text-align: center;
    
}

.navbar-brand span {
    font-size: 1.2rem;
    font-weight: 600;
    white-space: nowrap;
}

.navbar-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    position: relative;
    transition: all 0.3s;
}

.user-menu:hover {
    background: var(--hover-bg);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent-color);
    display: grid;
    place-items: center;
    overflow: hidden;
    flex-shrink: 0;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-name {
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 5px);
    right: 0;
    background: var(--secondary-bg);
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    min-width: 180px;
    padding: 0.5rem 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1001;
}

.dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    list-style: none;
}

.dropdown-menu li a {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.3s;
    font-size: 0.9rem;
    white-space: nowrap;
}

.dropdown-menu li a:hover {
    background: var(--hover-bg);
    padding-left: 1.2rem;
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: var(--navbar-height);
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--primary-bg);
    display: flex;
    flex-direction: column;
    padding: 1.5rem 0;
    border-right: 1px solid var(--border-color);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 999;
    overflow-y: auto;
}

.sidebar.active {
    transform: translateX(0);
}

.main-menu, .secondary-menu {
    list-style: none;
    padding: 0 1rem;
}

.main-menu li a, .secondary-menu li a {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 8px;
    margin-bottom: 0.25rem;
    transition: all 0.3s;
    gap: 1rem;
    font-size: 0.95rem;
}

.main-menu li a:hover, 
.main-menu li a.active,
.secondary-menu li a:hover {
    background: var(--hover-bg);
    color: var(--accent-color);
}

.menu-icon {
    font-size: 1.1rem;
    width: 24px;
    text-align: center;
    flex-shrink: 0;
}

.menu-bottom {
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    padding: 1rem 1rem 0;
}

/* Main Content */
.main-content {
    margin-top: var(--navbar-height);
    padding: 1.5rem;
    flex: 1;
    transition: margin-left 0.3s ease;
    min-height: calc(100vh - var(--navbar-height));
}

/* Overlay for mobile */
.overlay {
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Footer */
.footer {
    background: var(--primary-bg);
    border-top: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    margin-top: auto;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
    text-align: center;
}

.footer-center p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.9rem;
    line-height: 1.5;
    text-align: center;
}

.footer-links {
    display: inline-flex;
    gap: 1rem;
    justify-content: center;
    text-align: center;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s ease;
    position: relative;
    padding: 0.25rem 0;
}

.footer-links a:hover {
    color: var(--accent-color);
}

.social-links {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
}

.social-links a {
    color: var(--text-secondary);
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.social-links a:hover {
    color: var(--accent-color);
    transform: translateY(-2px);
}

/* Tablet Responsive (768px - 1024px) */
@media (min-width: 768px) {
    .menu-btn {
        display: none;
    }
    
    .sidebar {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: var(--sidebar-width);
    }
    
    .footer {
        margin-left: var(--sidebar-width);
    }
    
    .footer-content {
        flex-direction: column;
        justify-content: center;
        align-items: center;
        text-align: center;
        gap: 1rem;
    }
    
    .footer-center p {
        text-align: center;
        margin-bottom: 0;
    }
    
    .footer-links {
        justify-content: center;
    }
    
    .social-links {
        justify-content: center;
    }
}

/* Large tablets and small desktops */
@media (min-width: 1024px) {
    :root {
        --navbar-height: 80px;
    }
    
    .navbar {
        padding: 0 2rem;
    }
    
    .main-content {
        padding: 2rem;
    }
    
    .footer {
        padding: 2.5rem 2rem;
    }
}

/* Mobile Landscape (576px - 767px) */
@media (max-width: 767px) and (min-width: 576px) {
    :root {
        --sidebar-width: 280px;
    }
    
    .navbar {
        padding: 0 1rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .user-name {
        display: none;
    }
    
    .dropdown-menu {
        min-width: 160px;
    }
}

/* Mobile Portrait (up to 575px) */
@media (max-width: 575px) {
    :root {
        --sidebar-width: 85%;
        --navbar-height: 60px;
    }
    
    .navbar {
        padding: 0 0.75rem;
        font-size: 14px;
    }
    
    .navbar-brand span {
        display: none;
    }
    
    .navbar-brand {
        gap: 0.5rem;
    }
    
    .logo-icon {
        width: 30px;
        height: 30px;
        font-size: 0.8rem;
    }
    
    .user-menu {
        gap: 0.5rem;
        padding: 0.25rem;
    }
    
    .user-avatar {
        width: 32px;
        height: 32px;
    }
    
    .user-name {
        display: none;
    }
    
    .dropdown-menu {
        min-width: 150px;
        right: -10px;
    }
    
    .main-content {
        padding: 1rem 0.75rem;
    }
    
    .sidebar {
        padding: 1rem 0;
    }
    
    .main-menu, .secondary-menu {
        padding: 0 0.75rem;
    }
    
    .main-menu li a, .secondary-menu li a {
        padding: 0.625rem 0.75rem;
        font-size: 0.9rem;
        gap: 0.75rem;
    }
    
    .menu-icon {
        font-size: 1rem;
        width: 20px;
    }
    
    .footer {
        padding: 1.5rem 0.75rem;
    }
    
    .footer-links {
        gap: 0.75rem;
    }
    
    .footer-links a {
        font-size: 0.85rem;
    }
    
    .social-links {
        gap: 1rem;
    }
    
    .social-links a {
        font-size: 1.1rem;
    }
}

/* Extra small devices (up to 374px) */
@media (max-width: 374px) {
    :root {
        --sidebar-width: 90%;
        --navbar-height: 55px;
    }
    
    .navbar {
        padding: 0 0.5rem;
        font-size: 12px;
    }
    
    .logo-icon {
        width: 28px;
        height: 28px;
        font-size: 0.75rem;
    }
    
    .user-avatar {
        width: 28px;
        height: 28px;
    }
    
    .main-content {
        padding: 0.75rem 0.5rem;
    }
    
    .footer {
        padding: 1rem 0.5rem;
    }
    
    .footer-links a {
        font-size: 0.8rem;
    }
    
    .dropdown-menu {
        min-width: 140px;
        right: -5px;
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    .main-menu li a, 
    .secondary-menu li a {
        padding: 1rem 1rem;
        min-height: 48px;
    }
    
    .user-menu {
        min-height: 48px;
        padding: 0.5rem;
    }
    
    .menu-btn {
        min-height: 48px;
        min-width: 48px;
    }
    
    .dropdown-menu li a {
        padding: 1rem;
        min-height: 48px;
    }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from { transform: translateY(10px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.dropdown-menu li {
    animation: slideIn 0.3s ease forwards;
    animation-delay: calc(var(--i) * 0.05s);
    opacity: 0;
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .sidebar {
        transition: none;
    }
    
    .overlay {
        transition: none;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #64748b;
        --hover-bg: #475569;
    }
}

/* Print styles */
@media print {
    .navbar,
    .sidebar,
    .overlay,
    .footer {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0 !important;
        margin-top: 0 !important;
        padding: 0 !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}