/* ===================================
   HEADER STYLES
   =================================== */
#header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: var(--z-index-fixed);
    height: var(--header-height);
}

.header-container {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    z-index: var(--z-index-fixed);
}

.logo a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
}

.logo img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    font-family: var(--font-family-heading);
    color: var(--color-primary);
}

/* Desktop Navigation */
.desktop-nav {
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-list {
    display: flex;
    align-items: center;
    justify-content: center;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
}

.nav-link {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--color-primary);
    background: rgba(59, 130, 246, 0.1);
}

.nav-link.active {
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: var(--z-index-fixed);
}

.hamburger-line {
    width: 100%;
    height: 3px;
    background: var(--color-text-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

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

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

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(11px, -11px);
}

/* Hamburger transform for 769px to 1200px range */
@media (min-width: 769px) and (max-width: 1200px) {
    .mobile-menu-toggle.active .hamburger-line:nth-child(3) {
        transform: rotate(-45deg) translate(9px, -9px);
    }
}

/* Mobile Navigation */
.mobile-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    height: calc(100vh - var(--header-height));
    background: var(--color-bg-primary);
    padding: var(--spacing-xl);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    z-index: 999;
    overflow-y: auto;
}

.mobile-nav.active {
    transform: translateX(0);
}

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

.mobile-nav-link {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    background: rgba(59, 130, 246, 0.1);
    color: var(--color-primary);
}

/* Responsive */
@media (max-width: 1200px) {
    .desktop-nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .mobile-nav {
        display: block;
    }
}

/* Mobile Header Height */
@media (max-width: 768px) {
    #header {
        height: 75px;
        min-height: 75px;
    }
    
    .header-container {
        padding: 0 var(--spacing-md);
        min-height: 75px;
    }
    
    .logo img {
        height: 40px;
    }
    
    .logo-text {
        font-size: var(--font-size-xl);
    }
    
    .mobile-menu-toggle {
        width: 32px;
        height: 28px;
    }
    
    main {
        padding-top: 75px;
    }
    
    .mobile-nav {
        top: 75px;
    }
}

/* Page offset for fixed header */
main {
    padding-top: var(--header-height);
}