/* Modern CSS Reset and Variables */
:root {
    /* Color Palette */
    --primary-color: #f0b000;
    --primary-dark: #d49c00;
    --primary-light: #ffda6a;
    --secondary-color: #0d1d2c;
    --secondary-light: #1a2f42;
    --accent-color: #00d4ff;
    --accent-dark: #00b8e6;
    
    /* Neutral Colors */
    --white: #ffffff;
    --light-gray: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --dark: #0d0d0d;
    
    /* Status Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    /* Theming (defaults = dark) */
    --bg-gradient-start: #0b1a2b; /* dark navy */
    --bg-gradient-end: #0f2137;   /* deeper navy */
    --text-color: var(--white);
    --surface-color: rgba(255,255,255,0.05);
    --surface-border: rgba(255,255,255,0.12);
    --surface-hover: rgba(255,255,255,0.08);
}

/* Light theme overrides */
.theme-light {
    --bg-gradient-start: #f7fafc;
    --bg-gradient-end: #e6edf5;
    --text-color: #0b1a2b;
    --surface-color: #ffffff;
    --surface-border: #e5e7eb;
    --surface-hover: #f3f4f6;
}

/* Dark theme overrides */
.theme-dark {
    --bg-gradient-start: #0b1a2b;
    --bg-gradient-end: #0f2137;
    --text-color: var(--white);
    --surface-color: rgba(255,255,255,0.05);
    --surface-border: rgba(255,255,255,0.12);
    --surface-hover: rgba(255,255,255,0.08);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    color: var(--text-color);
    line-height: 1.6;
    font-size: var(--font-size-base);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Navigation Styles */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: color-mix(in oklab, var(--surface-color) 90%, transparent);
    backdrop-filter: blur(24px) saturate(120%);
    border-bottom: 1px solid var(--surface-border);
    transition: var(--transition-normal);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.nav-container {
    width: 100%;
    padding: 0 var(--spacing-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

/* Logo Styles */
.logo a {
    text-decoration: none;
    display: block;
}

.twt-logo {
    font-weight: 800;
    font-size: var(--font-size-2xl);
    letter-spacing: -0.025em;
    color: var(--white);
    text-shadow: 0 0 20px rgba(240, 176, 0, 0.3);
    transition: var(--transition-normal);
}

.twt-logo-w {
    color: var(--primary-color);
    font-style: italic;
    position: relative;
    display: inline-block;
    transform: scale(1.1);
    margin: 0 -2px;
    transition: var(--transition-normal);
}

.logo:hover .twt-logo {
    text-shadow: 0 0 30px rgba(240, 176, 0, 0.6);
}

.logo:hover .twt-logo-w {
    color: var(--primary-light);
    transform: scale(1.2) rotate(-5deg);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: var(--spacing-2);
    border-radius: var(--radius);
    transition: var(--transition-normal);
    background: none;
    border: none;
    outline: none;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--white);
    margin: 3px 0;
    transition: var(--transition-normal);
    border-radius: var(--radius-full);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Navigation Content */
.nav-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-6);
}

.nav-links {
    display: flex;
    gap: var(--spacing-2);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    color: var(--white);
    text-decoration: none;
    border-radius: 9999px;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.nav-link:before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: var(--transition-slow);
}

.nav-link:hover:before {
    left: 100%;
}

.nav-link:hover {
    background: var(--surface-hover);
    color: var(--white);
    transform: translateY(-2px);
}

.nav-link i {
    font-size: var(--font-size-sm);
    width: 16px;
    text-align: center;
}

.nav-link.active {
    color: var(--white);
    position: relative;
}

.nav-link.active:hover {
    color: var(--white);
}

/* Active underline indicator */
.nav-link::after {
    content: '';
    position: absolute;
    left: 12px;
    right: 12px;
    bottom: 6px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    opacity: 0;
    transform: scaleX(0.6);
    transition: var(--transition-normal);
    border-radius: 2px;
}
.nav-link.active::after,
.nav-link:hover::after { opacity: 1; transform: scaleX(1); }

/* User Menu Styles */
.user-menu {
    position: relative;
}

.auth-buttons {
    display: flex;
    gap: var(--spacing-3);
}

.auth-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: var(--transition-normal);
}

.login-btn {
    color: var(--white);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.login-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
}

.register-btn {
    background: var(--primary-color);
    color: var(--dark);
    font-weight: 600;
}

.register-btn:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-2) var(--spacing-4);
    color: var(--white);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.user-profile:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    background: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--dark);
    font-weight: 600;
}

.user-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.username {
    font-weight: 500;
    font-size: var(--font-size-sm);
}

.admin-badge {
    background: var(--primary-color);
    color: var(--dark);
    font-size: var(--font-size-xs);
    font-weight: 700;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    align-self: flex-start;
}

.dropdown-arrow {
    font-size: var(--font-size-xs);
    transition: var(--transition-normal);
}

.dropdown.show .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-content {
    position: absolute;
    top: calc(100% + var(--spacing-2));
    right: 0;
    background: var(--surface-color);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    backdrop-filter: blur(20px);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition-normal);
    z-index: 1000;
}

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

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-4);
    color: var(--white);
    text-decoration: none;
    transition: var(--transition-fast);
    font-size: var(--font-size-sm);
}

.dropdown-item:hover {
    background: rgba(255, 255, 255, 0.1);
}

.dropdown-item.logout {
    color: var(--error);
}

.dropdown-item.logout:hover {
    background: rgba(239, 68, 68, 0.1);
}

.dropdown-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: var(--spacing-2) 0;
}

/* Tooltip Styles */
.tooltip {
    position: absolute;
    background: var(--gray-900);
    color: var(--white);
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: var(--radius);
    font-size: var(--font-size-sm);
    box-shadow: var(--shadow-lg);
    z-index: 1001;
    display: none;
    max-width: 250px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.tooltip:after {
    content: '';
    position: absolute;
    top: -5px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-bottom: 5px solid var(--gray-900);
}

/* Main Content */
.main-content {
    margin-top: 80px;
    min-height: calc(100vh - 80px);
    padding: var(--spacing-8) 0;
}

/* Flash Messages */
.flash-messages {
    position: fixed;
    top: 100px;
    right: var(--spacing-6);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
    max-width: 400px;
}

.flash-message {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    animation: slideIn 0.3s ease-out;
    border-left: 4px solid;
}

.flash-message.success {
    border-left-color: var(--success);
}

.flash-message.error {
    border-left-color: var(--error);
}

.flash-message.warning {
    border-left-color: var(--warning);
}

.flash-message.info {
    border-left-color: var(--info);
}

.flash-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-4);
}

.flash-icon {
    font-size: var(--font-size-lg);
}

.flash-message.success .flash-icon {
    color: var(--success);
}

.flash-message.error .flash-icon {
    color: var(--error);
}

.flash-message.warning .flash-icon {
    color: var(--warning);
}

.flash-message.info .flash-icon {
    color: var(--info);
}

.flash-text {
    color: var(--gray-800);
    font-weight: 500;
    flex: 1;
}

.flash-close {
    position: absolute;
    top: var(--spacing-2);
    right: var(--spacing-2);
    background: none;
    border: none;
    color: var(--gray-500);
    cursor: pointer;
    font-size: var(--font-size-lg);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

.flash-close:hover {
    background: var(--gray-100);
    color: var(--gray-700);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-sm);
    transition: var(--transition-normal);
    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-slow);
}

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

.btn-primary {
    background: var(--primary-color);
    color: var(--dark);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--white);
    color: var(--white);
}

.btn-secondary:hover {
    background: var(--white);
    color: var(--dark);
    transform: translateY(-2px);
}

.btn-icon {
    transition: var(--transition-normal);
}

.btn:hover .btn-icon {
    transform: translateX(4px);
}

/* Footer Styles */
.footer {
    background: var(--surface-color);
    border-top: 1px solid var(--surface-border);
    margin-top: auto;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-12) var(--spacing-6) var(--spacing-8);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-8);
}

.footer-section h4 {
    color: var(--white);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    font-size: var(--font-size-lg);
}

.footer-logo .twt-logo {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-3);
    display: block;
}

.footer-description {
    color: var(--gray-400);
    line-height: 1.6;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.footer-links a {
    color: var(--gray-400);
    text-decoration: none;
    transition: var(--transition-fast);
}

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

.social-links {
    display: flex;
    gap: var(--spacing-4);
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--surface-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    text-decoration: none;
    transition: var(--transition-normal);
}

.social-link:hover {
    background: var(--primary-color);
    color: var(--dark);
    transform: translateY(-2px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-6);
    text-align: center;
    color: var(--gray-400);
}

/* Touch and Mobile Optimizations */
@media (hover: none) and (pointer: coarse) {
    .nav-link:hover:before,
    .btn:hover:before {
        transform: scaleX(0);
    }
    
    .nav-link:active {
        background: rgba(255, 255, 255, 0.1);
        transform: scale(0.98);
    }
    
    .btn:active {
        transform: scale(0.95);
    }
    
    .feature-card:hover {
        transform: none;
    }
    
    .floating-card:hover {
        transform: none;
    }
    
    /* Ensure minimum touch target size */
    .nav-link,
    .auth-btn,
    .user-profile,
    .dropdown-item,
    .mobile-menu-toggle {
        min-height: 44px;
        min-width: 44px;
    }
}

/* Enhanced Responsive Design with More Breakpoints */

/* Ultra-wide screens (1920px+) */
@media (min-width: 1920px) {
    .nav-container {
        max-width: 1800px;
        margin: 0 auto;
        padding: 0 var(--spacing-8);
    }
    
    .nav-content {
        gap: var(--spacing-12);
    }
    
    .nav-link {
        padding: var(--spacing-3) var(--spacing-5);
        font-size: var(--font-size-base);
    }
}

/* Large desktops (1440px - 1919px) */
@media (min-width: 1440px) and (max-width: 1919px) {
    .nav-container {
        padding: 0 var(--spacing-6);
    }
    
    .nav-content {
        gap: var(--spacing-10);
    }
}

/* Standard desktops (1200px - 1439px) */
@media (min-width: 1200px) and (max-width: 1439px) {
    .nav-container {
        padding: 0 var(--spacing-5);
    }
    
    .nav-content {
        gap: var(--spacing-8);
    }
}

/* Laptops and small desktops (1024px - 1199px) */
@media (min-width: 1024px) and (max-width: 1199px) {
    .nav-container {
        padding: 0 var(--spacing-4);
    }
    
    .nav-content {
        gap: var(--spacing-6);
    }
    
    .nav-links {
        gap: var(--spacing-1);
    }
    
    .nav-link {
        padding: var(--spacing-2) var(--spacing-3);
        font-size: var(--font-size-sm);
    }
    
    .user-menu {
        margin-left: var(--spacing-4);
    }
    
    .auth-buttons {
        gap: var(--spacing-2);
    }
    
    .auth-btn {
        padding: var(--spacing-2) var(--spacing-3);
        font-size: var(--font-size-sm);
    }
}

/* Tablets landscape (900px - 1023px) */
@media (min-width: 900px) and (max-width: 1023px) {
    .nav-container {
        padding: 0 var(--spacing-4);
        height: 70px;
    }
    
    .main-content {
        margin-top: 70px;
    }
    
    .nav-content {
        gap: var(--spacing-4);
    }
    
    .nav-section-header .section-title {
        font-size: var(--font-size-xs);
    }
    
    .nav-link {
        padding: var(--spacing-2);
        font-size: var(--font-size-xs);
        gap: var(--spacing-1);
    }
    
    .nav-link span {
        display: none;
    }
    
    .nav-link i {
        font-size: var(--font-size-base);
    }
    
    .user-info {
        display: none;
    }
    
    .auth-btn span {
        display: none;
    }
    
    .auth-btn {
        padding: var(--spacing-2);
        min-width: 44px;
        justify-content: center;
    }
}

/* Tablets portrait (768px - 899px) */
@media (min-width: 768px) and (max-width: 899px) {
    .nav-container {
        padding: 0 var(--spacing-4);
        height: 70px;
    }
    
    .main-content {
        margin-top: 70px;
    }
    
    .mobile-menu-toggle {
        display: flex;
        z-index: 1001;
        position: relative;
    }
    
    .mobile-menu-toggle:hover {
        background: rgba(255, 255, 255, 0.1);
    }
    
    .nav-content {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(13, 29, 44, 0.98);
        backdrop-filter: blur(20px);
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        flex-direction: row;
        flex-wrap: wrap;
        padding: var(--spacing-6);
        gap: var(--spacing-4);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
        z-index: 999;
    }
    
    .nav-content.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-section {
        flex: 1;
        min-width: 300px;
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: var(--radius-lg);
        padding: var(--spacing-4);
        background: rgba(255, 255, 255, 0.02);
    }
    
    .nav-section-header {
        margin-bottom: var(--spacing-3);
        padding: var(--spacing-2) 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .nav-section-header .section-title {
        font-size: var(--font-size-base);
        font-weight: 600;
    }
    
    .nav-links {
        flex-direction: column;
        gap: var(--spacing-2);
    }
    
    .nav-link {
        justify-content: flex-start;
        padding: var(--spacing-3);
        border-radius: var(--radius-lg);
        font-size: var(--font-size-sm);
        min-height: 48px;
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid rgba(255, 255, 255, 0.1);
        transition: all 0.2s ease;
    }
    
    .user-menu {
        width: 100%;
        margin-top: var(--spacing-4);
        padding-top: var(--spacing-4);
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
}

/* Mobile devices (up to 767px) */
@media (max-width: 767px) {
    .nav-container {
        height: 70px;
        padding: 0 var(--spacing-3);
    }
    
    .main-content {
        margin-top: 70px;
    }
    
    .mobile-menu-toggle {
        display: flex;
        z-index: 1001;
        position: relative;
        padding: var(--spacing-3);
        border-radius: var(--radius-lg);
        transition: all 0.2s ease;
    }
    
    .mobile-menu-toggle:hover {
        background: rgba(255, 255, 255, 0.1);
    }
    
    .mobile-menu-toggle:active {
        transform: scale(0.95);
        background: rgba(255, 255, 255, 0.15);
    }
    
    .nav-content {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(13, 29, 44, 0.98);
        backdrop-filter: blur(20px);
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        flex-direction: column;
        padding: var(--spacing-4);
        gap: var(--spacing-3);
        transform: translateX(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
        z-index: 999;
        overscroll-behavior: contain;
    }
    
    .nav-content.active {
        transform: translateX(0);
        opacity: 1;
        visibility: visible;
    }
    

    
    .nav-links {
        flex-direction: column;
        gap: var(--spacing-2);
    }
    
    .nav-link {
        justify-content: flex-start;
        padding: var(--spacing-4);
        border-radius: var(--radius-lg);
        font-size: var(--font-size-base);
        min-height: 56px;
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid rgba(255, 255, 255, 0.1);
        transition: all 0.2s ease;
        position: relative;
        overflow: hidden;
    }
    
    .nav-link::before {
        content: '';
        position: absolute;
        left: 0;
        top: 0;
        height: 100%;
        width: 4px;
        background: var(--primary-color);
        transform: scaleY(0);
        transition: transform 0.2s ease;
    }
    
    .nav-link:active {
        background: rgba(255, 255, 255, 0.15);
        transform: scale(0.98);
    }
    
    .nav-link:active::before {
        transform: scaleY(1);
    }
    
    .nav-link.active {
        background: rgba(240, 176, 0, 0.2);
        color: var(--primary-color);
        border-color: rgba(240, 176, 0, 0.4);
        font-weight: 600;
    }
    
    .nav-link.active::before {
        transform: scaleY(1);
    }
    
    .nav-link i {
        font-size: var(--font-size-lg);
        width: 24px;
        margin-right: var(--spacing-3);
        color: var(--primary-color);
    }
    
    .nav-link span {
        font-weight: 500;
    }
    

    
    .user-menu {
        width: 100%;
        margin-top: var(--spacing-6);
        padding-top: var(--spacing-6);
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .auth-buttons {
        flex-direction: column;
        gap: var(--spacing-3);
        width: 100%;
    }
    
    .auth-btn {
        width: 100%;
        justify-content: center;
        padding: var(--spacing-4);
        font-size: var(--font-size-base);
        min-height: 56px;
        border-radius: var(--radius-lg);
        font-weight: 600;
        transition: all 0.2s ease;
    }
    
    .auth-btn:active {
        transform: scale(0.98);
    }
    
    .register-btn {
        background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
        box-shadow: 0 4px 12px rgba(240, 176, 0, 0.3);
    }
    
    .user-profile {
        width: 100%;
        justify-content: flex-start;
        padding: var(--spacing-4);
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: var(--radius-lg);
        min-height: 56px;
    }
    
    .dropdown-content {
        position: static;
        background: transparent;
        box-shadow: none;
        border: none;
        padding: var(--spacing-3) 0 0 0;
        opacity: 1;
        visibility: visible;
        transform: none;
        width: 100%;
    }
    
    .dropdown-item {
        padding: var(--spacing-3) var(--spacing-4);
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: var(--radius-lg);
        margin-bottom: var(--spacing-2);
        min-height: 48px;
        display: flex;
        align-items: center;
        transition: all 0.2s ease;
    }
    
    .dropdown-item:active {
        background: rgba(255, 255, 255, 0.15);
        transform: scale(0.98);
    }
    
    .dropdown-divider {
        margin: var(--spacing-3) 0;
        border-color: rgba(255, 255, 255, 0.1);
    }
    
    /* Mobile Menu Overlay */
    .nav-content.active::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.6);
        z-index: -1;
        backdrop-filter: blur(2px);
    }
    
    .flash-messages {
        right: var(--spacing-3);
        left: var(--spacing-3);
        max-width: none;
        top: 85px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-6);
        text-align: center;
        padding: var(--spacing-8) var(--spacing-4);
    }
    
    .social-links {
        justify-content: center;
    }
    
    .footer-links {
        align-items: center;
    }
}

/* Small mobile devices (up to 480px) */
@media (max-width: 480px) {
    .nav-container {
        height: 60px;
        padding: 0 var(--spacing-2);
    }
    
    .main-content {
        margin-top: 60px;
        padding: var(--spacing-3) 0;
    }
    
    .twt-logo {
        font-size: var(--font-size-lg);
    }
    
    .mobile-menu-toggle {
        padding: var(--spacing-2);
    }
    
    .mobile-menu-toggle span {
        width: 20px;
        height: 2px;
        margin: 2px 0;
    }
    
    .nav-content {
        top: 60px;
        padding: var(--spacing-3);
        gap: var(--spacing-4);
    }
    
    .nav-section {
        padding-bottom: var(--spacing-3);
    }
    
    .nav-section-header {
        margin-bottom: var(--spacing-3);
    }
    
    .nav-section-header .section-title {
        font-size: var(--font-size-base);
    }
    
    .nav-link {
        padding: var(--spacing-3);
        font-size: var(--font-size-sm);
        min-height: 48px;
        gap: var(--spacing-2);
    }
    
    .nav-link i {
        font-size: var(--font-size-base);
        width: 20px;
        margin-right: var(--spacing-2);
    }
    
    .auth-btn {
        padding: var(--spacing-3);
        font-size: var(--font-size-sm);
        min-height: 48px;
    }
    
    .user-profile {
        padding: var(--spacing-3);
        min-height: 48px;
    }
    
    .dropdown-item {
        padding: var(--spacing-2) var(--spacing-3);
        min-height: 44px;
        font-size: var(--font-size-sm);
    }
    
    .flash-messages {
        top: 75px;
        right: var(--spacing-2);
        left: var(--spacing-2);
    }
    
    .footer-content {
        padding: var(--spacing-4) var(--spacing-2);
    }
}

/* Extra small devices (up to 360px) */
@media (max-width: 360px) {
    .nav-container {
        height: 56px;
        padding: 0 var(--spacing-1);
    }
    
    .main-content {
        margin-top: 56px;
    }
    
    .twt-logo {
        font-size: var(--font-size-base);
    }
    
    .mobile-menu-toggle {
        padding: var(--spacing-1);
    }
    
    .mobile-menu-toggle span {
        width: 18px;
        height: 2px;
    }
    
    .nav-content {
        top: 56px;
        padding: var(--spacing-2);
        gap: var(--spacing-3);
    }
    
    .nav-link {
        padding: var(--spacing-2);
        min-height: 44px;
        font-size: var(--font-size-xs);
    }
    
    .nav-link i {
        width: 18px;
        font-size: var(--font-size-sm);
    }
    
    .auth-btn {
        padding: var(--spacing-2);
        min-height: 44px;
        font-size: var(--font-size-xs);
    }
    
    .user-profile {
        padding: var(--spacing-2);
        min-height: 44px;
    }
    
    .dropdown-item {
        padding: var(--spacing-1) var(--spacing-2);
        min-height: 40px;
        font-size: var(--font-size-xs);
    }
    
    .flash-messages {
        top: 70px;
        right: var(--spacing-1);
        left: var(--spacing-1);
    }
}

/* Accessibility and Focus Improvements */
.nav-link:focus,
.auth-btn:focus,
.user-profile:focus,
.mobile-menu-toggle:focus,
.dropdown-item:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Theme toggle */
.theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--surface-border);
    background: var(--surface-color);
    color: var(--text-color);
    cursor: pointer;
    transition: var(--transition-normal);
}
.theme-toggle:hover { background: var(--surface-hover); }
.theme-toggle i { width: 16px; text-align: center; }

.nav-link:focus-visible,
.auth-btn:focus-visible,
.user-profile:focus-visible,
.mobile-menu-toggle:focus-visible,
.dropdown-item:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .navbar {
        border-bottom: 2px solid var(--white);
    }
    
    .nav-link,
    .auth-btn,
    .user-profile {
        border: 2px solid var(--white);
    }
    
    .nav-content {
        border: 2px solid var(--white);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .nav-link,
    .auth-btn,
    .mobile-menu-toggle,
    .nav-content,
    .dropdown-content,
    .user-profile {
        transition: none;
        animation: none;
    }
    
    .nav-link:hover:before,
    .btn:hover:before {
        transition: none;
    }
}

/* Print styles */
@media print {
    .navbar,
    .mobile-menu-toggle,
    .nav-content {
        display: none;
    }
    
    .main-content {
        margin-top: 0;
    }
}