/* Modern Header System for DriveGo */

.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(var(--bg-rgb), 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
    transform: translateY(0);
}

.main-header.hidden {
    transform: translateY(-100%);
}

.main-header.scrolled {
    background: rgba(var(--bg-rgb), 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.header-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    position: relative;
}

/* Logo */
.header-logo {
    opacity: 0;
    transform: translateX(-20px);
    animation: slideInLeft 0.6s ease-out 0.1s forwards;
}

.logo-link {
    text-decoration: none;
}

.logo-text {
    font-family: 'Orbitron', sans-serif;
    font-weight: 900;
    font-size: 1.75rem;
    color: var(--primary-color);
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: all 0.3s ease;
    position: relative;
}

.logo-text::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s ease;
}

.logo-link:hover .logo-text::after {
    width: 100%;
}

/* Desktop Navigation */
.header-nav-items {
    display: flex;
    align-items: center;
    gap: 2rem;
    opacity: 0;
    transform: translateY(-20px);
    animation: slideInDown 0.6s ease-out 0.2s forwards;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.nav-item {
    position: relative;
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0;
    position: relative;
    transition: all 0.3s ease;
    opacity: 0.8;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-color);
    opacity: 1;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--accent-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    position: relative;
    overflow: hidden;
}

.theme-toggle-btn:hover {
    background: var(--secondary-color);
    border-color: var(--accent-color);
    transform: translateY(-1px) scale(1.05);
    color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(var(--accent-rgb), 0.3);
}

.theme-toggle-btn:active {
    transform: translateY(0) scale(0.95);
}

.mobile-theme-toggle-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--accent-color);
    padding: 0.6rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    width: 100%;
    justify-content: center;
}

.mobile-theme-toggle-btn:hover {
    background: var(--secondary-color);
    border-color: var(--accent-color);
    transform: translateY(-1px);
    color: var(--accent-color);
}

.mobile-theme-toggle-btn:active {
    transform: translateY(0) scale(0.98);
}

.auth-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.auth-btn:hover {
    background: var(--secondary-color);
    border-color: var(--accent-color);
    transform: translateY(-1px);
}

.cta-btn {
    background: var(--accent-color);
    color: var(--bg-color);
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 2px 8px rgba(var(--accent-rgb), 0.3);
}

.cta-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(var(--accent-rgb), 0.4);
    color: var(--bg-color);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    gap: 4px;
    opacity: 0;
    transform: translateX(20px);
    animation: slideInRight 0.6s ease-out 0.3s forwards;
}

.menu-line {
    width: 24px;
    height: 2px;
    background: var(--text-color);
    transition: all 0.3s ease;
    transform-origin: center;
}

.mobile-menu-btn.active .menu-line:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

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

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

/* Mobile Navigation */
.mobile-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.mobile-nav.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.mobile-nav-content {
    padding: 2rem 0;
}

.mobile-nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.mobile-nav-list li {
    border-bottom: 1px solid var(--border-color);
}

.mobile-nav-list li:last-child {
    border-bottom: none;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    padding: 1rem 2rem;
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.mobile-nav-link:hover {
    background: var(--secondary-color);
    color: var(--accent-color);
    padding-left: 2.5rem;
}

.mobile-nav-link.cta {
    color: var(--accent-color);
    font-weight: 600;
}

.mobile-auth-section {
    padding: 1rem 2rem;
    border-top: 1px solid var(--border-color);
    margin-top: 1rem;
}

.mobile-auth-btn {
    width: 100%;
    background: var(--accent-color);
    color: var(--bg-color);
    border: none;
    padding: 0.8rem;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.mobile-auth-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .header-nav-items {
        gap: 1.5rem;
    }
    
    .nav-list {
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .header-nav-items {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .header-nav {
        padding: 0.8rem 0;
    }
    
    .logo-text {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .logo-text {
        font-size: 1.3rem;
    }
    
    .mobile-nav-link {
        padding: 0.8rem 1.5rem;
    }
    
    .mobile-auth-section {
        padding: 1rem 1.5rem;
    }
}

/* Animation Keyframes */
@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Stagger animation for nav items */
.nav-item:nth-child(1) { animation-delay: 0.3s; }
.nav-item:nth-child(2) { animation-delay: 0.4s; }
.nav-item:nth-child(3) { animation-delay: 0.5s; }
.nav-item:nth-child(4) { animation-delay: 0.6s; }
.nav-item:nth-child(5) { animation-delay: 0.7s; }
.nav-item:nth-child(6) { animation-delay: 0.8s; }

.nav-item {
    opacity: 0;
    transform: translateY(-10px);
    animation: slideInDown 0.4s ease-out forwards;
}

/* Performance optimizations */
.main-header {
    will-change: transform;
}

.mobile-nav {
    will-change: transform, opacity;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .main-header,
    .nav-link,
    .auth-btn,
    .cta-btn,
    .mobile-menu-btn,
    .mobile-nav {
        transition: none;
        animation: none;
    }
    
    .header-logo,
    .header-nav-items,
    .mobile-menu-btn,
    .nav-item {
        opacity: 1;
        transform: none;
        animation: none;
    }
}