/**
 * Header Component
 * Sticky navigation with dark theme
 */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
    background: rgba(10, 10, 10, 0.98);
}

.header .container {
    max-width: var(--container-2xl);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.header__content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    gap: var(--spacing-lg);
}

/* Logo */
.header__logo {
    display: flex;
    flex-direction: column;
    gap: 2px;
    transition: transform var(--transition-fast);
}

.header__logo:hover {
    transform: scale(1.05);
}

.logo__text {
    font-family: var(--font-heading);
    font-size: var(--fs-xl);
    font-weight: var(--font-weight-black);
    color: var(--color-text-primary);
    letter-spacing: 0.05em;
    line-height: 1;
}

.logo__subtitle {
    font-size: var(--fs-xs);
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    line-height: 1;
}

/* Navigation */
.header__nav {
    display: none;
    gap: var(--spacing-xl);
}

.nav__link {
    font-size: var(--fs-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
    padding: var(--spacing-sm) 0;
    transition: color var(--transition-fast);
}

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

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

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

/* Header Actions */
.header__actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 28px;
    height: 28px;
    padding: 0;
    z-index: var(--z-sticky);
}

.mobile-menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

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

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

/* Mobile Menu */
.header__nav.mobile-open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg-secondary);
    padding: var(--spacing-2xl) var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    animation: slideDown var(--transition-base);
}

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

/* Tablet & Desktop */
@media (min-width: 768px) {
    .header__nav {
        display: flex;
    }

    .mobile-menu-toggle {
        display: none;
    }
}

/* Desktop Only */
@media (min-width: 1024px) {
    .header .container {
        padding: 0 var(--spacing-2xl);
    }

    .header__nav {
        gap: var(--spacing-2xl);
    }
}

/* Container Helper */
.container {
    width: 100%;
    max-width: var(--container-2xl);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-xl);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--spacing-2xl);
    }
}