/* styles/header.css */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(11, 18, 32, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: all var(--transition-normal);
}

.header.scrolled {
    background: rgba(11, 18, 32, 0.98);
    border-bottom-color: var(--border-color);
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
    position: relative;
}

.nav__logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
    z-index: 1001;
}

.nav__logo:hover {
    color: var(--primary-color);
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav__list {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
}

.nav__item {
    position: relative;
}

.nav__link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
    padding: 0.5rem 0;
}

.nav__link:hover,
.nav__link.active-link {
    color: var(--primary-color);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-normal);
    border-radius: 2px;
}

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

.nav__buttons {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav__resume-btn {
    background: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-normal);
    border: 2px solid var(--primary-color);
    white-space: nowrap;
}

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

.nav__toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: var(--spacing-xs);
    background: none;
    border: none;
    z-index: 1001;
    transition: transform var(--transition-normal);
}

.nav__toggle:hover {
    transform: scale(1.1);
}

.nav__toggle i {
    font-size: 1.5rem;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav {
        height: 70px;
    }

    .nav__menu {
        position: fixed;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100vh;
        background: var(--bg-primary);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding: 100px var(--spacing-md) var(--spacing-2xl);
        transition: left var(--transition-normal);
        box-shadow: var(--shadow-xl);
        overflow-y: auto;
    }

    .nav__menu.active {
        left: 0;
    }

    .nav__list {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-xl);
        width: 100%;
    }

    .nav__link {
        font-size: var(--font-size-lg);
        padding: 1rem 2rem;
        display: block;
        border-radius: var(--radius-md);
        transition: all var(--transition-normal);
    }

    .nav__link:hover,
    .nav__link.active-link {
        background: var(--bg-secondary);
        color: var(--primary-color);
        transform: translateX(10px);
    }

    .nav__link::after {
        display: none;
    }

    .nav__buttons {
        margin-top: var(--spacing-xl);
        flex-direction: column;
        width: 100%;
        max-width: 200px;
    }

    .nav__resume-btn {
        text-align: center;
        width: 100%;
    }

    .nav__toggle {
        display: flex;
    }

    /* Hamburger animation */
    .nav__toggle.active i.fa-bars {
        transform: rotate(180deg);
        opacity: 0;
    }

    .nav__toggle.active i.fa-times {
        transform: rotate(0deg);
        opacity: 1;
    }

    .nav__toggle i.fa-times {
        position: absolute;
        opacity: 0;
        transform: rotate(-180deg);
        transition: all var(--transition-normal);
    }

    .nav__toggle i.fa-bars {
        transition: all var(--transition-normal);
    }
}

/* Tablet Navigation */
@media (min-width: 769px) and (max-width: 1024px) {
    .nav__list {
        gap: var(--spacing-md);
    }

    .nav__link {
        font-size: var(--font-size-sm);
    }

    .nav__resume-btn {
        padding: 0.6rem 1.2rem;
        font-size: var(--font-size-sm);
    }
}

/* Prevent body scroll when mobile menu is open */
body.no-scroll {
    overflow: hidden;
}

/* Active state animation */
.nav__link.active-link {
    font-weight: 600;
}

/* Dropdown animation for future use */
.nav__dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    min-width: 200px;
}

.nav__item:hover .nav__dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Header loading animation */
@keyframes headerSlideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.header {
    animation: headerSlideDown 0.6s ease-out;
}

/* Staggered animation for nav items */
.nav__item {
    animation: fadeInUp 0.6s ease-out;
}

.nav__item:nth-child(1) { animation-delay: 0.1s; }
.nav__item:nth-child(2) { animation-delay: 0.2s; }
.nav__item:nth-child(3) { animation-delay: 0.3s; }
.nav__item:nth-child(4) { animation-delay: 0.4s; }
.nav__item:nth-child(5) { animation-delay: 0.5s; }
.nav__item:nth-child(6) { animation-delay: 0.6s; }

/* Focus styles for accessibility */
.nav__link:focus,
.nav__resume-btn:focus,
.nav__toggle:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .header {
        background: var(--bg-secondary);
        border-bottom: 2px solid var(--text-primary);
    }
    
    .nav__link {
        color: var(--text-primary);
    }
    
    .nav__link:hover,
    .nav__link.active-link {
        color: var(--primary-color);
        text-decoration: underline;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .header,
    .nav__link,
    .nav__resume-btn,
    .nav__toggle {
        transition: none;
        animation: none;
    }
    
    .nav__menu {
        transition: left 0.1s ease;
    }
}