/* Header */
.site-header {
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(25px) saturate(170%);
    -webkit-backdrop-filter: blur(25px) saturate(200%);
    color: #111827;
    padding: 1rem 0;
    position: sticky;
    top: 12px;
    z-index: 100;
    transition: padding 0.25s ease, background-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
    margin: 0 20px;
    width: calc(100% - 40px);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 10px 40px rgba(15, 23, 42, 0.12);
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: 1.25rem;
    font-weight: 600;
    text-decoration: none;
    color: #111827;
    letter-spacing: -0.01em;
    transition: color 0.2s ease, opacity 0.2s ease;
}

.site-title:hover { opacity: 0.8; }

/* Header on scroll */
.site-header.scrolled {
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(25px) saturate(170%);
    -webkit-backdrop-filter: blur(25px) saturate(200%);
    padding: 1rem 0;
    top: 12px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 10px 40px rgba(15, 23, 42, 0.12);
}

/* Navigation */
.main-navigation {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.main-navigation-menu {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    margin: 0;
    padding: 0;
}

.main-navigation-menu a {
    color: #374151;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    padding: 0.5rem 0;
}

.main-navigation-menu a:hover { 
    color: #111827; 
}

/* Enhanced hover underline effect */
.main-navigation-menu a::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #0f172a;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 1px;
}

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

/* Mobile menu toggle button */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 24px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 10;
    position: relative;
}

/* Desktop navigation - hide mobile menu */
@media (min-width: 769px) {
    .mobile-menu-toggle {
        display: none !important;
    }
    
    .main-navigation-menu {
        display: flex !important;
        position: static;
        background: transparent;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        flex-direction: row;
        gap: 1.5rem;
        padding: 0;
        margin-top: 0;
        border-radius: 0;
        box-shadow: none;
        border: none;
    }
    
    .main-navigation-menu li {
        width: auto;
    }
    
    .main-navigation-menu a {
        display: inline;
        padding: 0.5rem 0;
        font-size: 0.95rem;
        border-bottom: none;
        text-align: left;
    }
    
    .main-navigation-menu a::after {
        display: block;
    }
}

.hamburger-line {
    width: 100%;
    height: 2px;
    background: #374151;
    border-radius: 2px;
    transition: all 0.3s ease;
    transform-origin: center;
}

.mobile-menu-toggle:hover .hamburger-line {
    background: #111827;
}

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

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

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

@media (max-width: 768px) {
    .site-header,
    .site-header.scrolled {
        padding: 0.625rem 0;
        top: 8px;
        margin: 0 12px;
        width: calc(100% - 24px);
    }

    .site-title {
        font-size: 1.1rem;
    }

    .mobile-menu-toggle {
        display: flex !important;
    }

    .hamburger-line {
        background-color: #1e293b;
    }

    .main-navigation-menu {
        display: none;
        position: absolute;
        top: calc(100% + 10px);
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 1.5rem;
        gap: 0.5rem;
        border-radius: 12px;
        box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        border: 1px solid rgba(0, 0, 0, 0.05);
        text-align: center;
    }

    .main-navigation-menu.active {
        display: flex;
        animation: slideDown 0.3s ease-out forwards;
    }

    .main-navigation-menu li {
        width: 100%;
    }

    .main-navigation-menu a {
        display: block;
        padding: 0.75rem 0;
        font-size: 1rem;
    }

    .main-navigation-menu a::after {
        display: none;
    }

    @keyframes slideDown {
        from { opacity: 0; transform: translateY(-10px); }
        to { opacity: 1; transform: translateY(0); }
    }
}