/* ============================================
   HEADER STYLES - MIGRATIVE PARTNERS
   Navigation, Logo, CTA, Mobile Menu
   ============================================ */

/* Header Container */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: var(--z-header);
    padding: var(--spacing-lg) var(--container-padding);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background: rgba(10, 11, 26, 0.8);
    border-bottom: 1px solid rgba(0, 255, 170, 0.1);
    animation: slideDown 0.6s ease-out;
    transition: all var(--transition-base);
}

/* Header scroll effect */
header.scrolled {
    padding: var(--spacing-md) var(--container-padding);
    background: rgba(10, 11, 26, 0.95);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

/* Header hidden state */
header.hidden {
    transform: translateY(-100%);
}

/* Navigation */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--container-max);
    margin: 0 auto;
    position: relative;
}

/* Logo */
.logo {
    height: 40px;
    width: auto;
    filter: brightness(1);
    transition: all var(--transition-base);
    cursor: pointer;
}

.logo:hover {
    filter: brightness(1.2) drop-shadow(0 0 20px rgba(0, 255, 170, 0.3));
    transform: translateY(-2px);
}

header.scrolled .logo {
    height: 35px;
}

/* Navigation Menu */
.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
    margin: 0;
    padding: 0;
}

.nav-menu li {
    position: relative;
}

.nav-menu a {
    color: var(--gray);
    text-decoration: none;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    letter-spacing: var(--tracking-wide);
    transition: all var(--transition-base);
    position: relative;
    padding: var(--spacing-xs) 0;
    display: inline-block;
}

/* Hover effect underline */
.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--neon-green);
    transition: width var(--transition-base);
    box-shadow: 0 0 10px rgba(0, 255, 170, 0.5);
}

.nav-menu a:hover {
    color: var(--white);
    transform: translateY(-1px);
}

.nav-menu a:hover::after {
    width: 100%;
}

/* Active link state */
.nav-menu a.active {
    color: var(--neon-green);
}

.nav-menu a.active::after {
    width: 100%;
}

/* CTA Button in Header */
.cta-button {
    background: transparent;
    color: var(--neon-green);
    border: 1px solid var(--neon-green);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-weight: var(--font-semibold);
    font-size: var(--text-sm);
    letter-spacing: var(--tracking-wider);
    text-transform: uppercase;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--neon-green);
    transition: left var(--transition-base);
    z-index: -1;
}

.cta-button:hover {
    color: var(--bg-primary);
    box-shadow: 0 0 30px rgba(0, 255, 170, 0.3);
    transform: translateY(-2px);
}

.cta-button:hover::before {
    left: 0;
}

.cta-button:active {
    transform: translateY(0);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 30px;
    height: 30px;
    gap: 4px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: calc(var(--z-header) + 1);
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--white);
    transition: all var(--transition-base);
    transform-origin: center;
}

/* Mobile menu animation */
.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(10, 11, 26, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: calc(var(--z-header) - 1);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.mobile-menu-overlay.active {
    opacity: 1;
}

/* Tablet Styles */
@media (max-width: 1024px) {
    .nav-menu {
        gap: var(--spacing-md);
    }
    
    .nav-menu a {
        font-size: var(--text-sm);
        white-space: nowrap;
    }
    
    .cta-button {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: var(--text-xs);
        white-space: nowrap;
    }
}

/* Medium Tablet Styles */
@media (max-width: 900px) {
    .nav-menu {
        gap: var(--spacing-sm);
    }
    
    .nav-menu a {
        font-size: var(--text-xs);
        padding: var(--spacing-xs) 0;
    }
    
    .cta-button {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.7rem;
    }
}

/* Mobile Styles */
@media (max-width: 768px) {
    header {
        padding: var(--spacing-md) var(--container-padding);
    }
    
    header.scrolled {
        padding: var(--spacing-sm) var(--container-padding);
    }
    
    .logo {
        height: 35px;
    }
    
    header.scrolled .logo {
        height: 30px;
    }
    
    /* Hide desktop menu */
    .nav-menu {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(10, 11, 26, 0.98);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding: var(--spacing-2xl) var(--spacing-lg);
        gap: var(--spacing-lg);
        opacity: 0;
        transform: translateY(-20px);
        transition: all var(--transition-base);
    }
    
    /* Show mobile menu when active */
    .nav-menu.active {
        display: flex;
        opacity: 1;
        transform: translateY(0);
        animation: fadeInUp 0.3s ease-out;
    }
    
    .nav-menu li {
        width: 100%;
        text-align: center;
    }
    
    .nav-menu a {
        display: block;
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--text-lg);
        color: var(--white);
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        width: 100%;
        font-weight: var(--font-medium);
        letter-spacing: var(--tracking-wide);
    }
    
    .nav-menu a::after {
        display: none;
    }
    
    .nav-menu a:hover {
        background: rgba(0, 255, 170, 0.1);
        color: var(--neon-green);
        transform: none;
    }
    
    .nav-menu li:last-child a {
        border-bottom: none;
    }
    
    /* Mobile CTA button */
    .nav-menu .cta-button {
        width: 100%;
        margin-top: var(--spacing-md);
        padding: var(--spacing-md) var(--spacing-xl);
        font-size: var(--text-base);
    }
    
    /* Show mobile menu button */
    .mobile-menu-btn {
        display: flex;
    }
    
    /* Show overlay when menu is active */
    .mobile-menu-overlay {
        display: block;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .logo {
        height: 30px;
    }
    
    .nav-menu {
        top: 60px;
        height: calc(100vh - 60px);
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .nav-menu a {
        font-size: var(--text-base);
        padding: var(--spacing-sm);
    }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    header,
    .nav-menu,
    .nav-menu a,
    .cta-button,
    .mobile-menu-btn span {
        animation: none;
        transition: none;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    header {
        border-bottom: 2px solid var(--neon-green);
    }
    
    .nav-menu a {
        font-weight: var(--font-semibold);
    }
    
    .cta-button {
        border-width: 2px;
    }
}