/* ============================================
   Header / Navigation - Floating Bubble
   ============================================ */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    background: transparent;
    padding: 14px 0;
    transition: all var(--transition-base);
}

.navbar {
    display: flex;
    align-items: center;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(15, 23, 42, 0.35);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(59, 130, 246, 0.12);
    border-radius: var(--border-radius-full);
    padding: 0.55rem 0.75rem 0.55rem 1.5rem;
    transition: all var(--transition-base);
}

.site-header.scrolled .navbar .container {
    background: rgba(15, 23, 42, 0.65);
    border-color: rgba(59, 130, 246, 0.18);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-headings);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-xl);
    color: var(--color-primary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.logo:hover {
    transform: scale(1.02);
}

.logo-icon {
    width: 30px;
    height: 30px;
    flex-shrink: 0;
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.65rem;
    letter-spacing: -0.02em;
}

/* Navigation Menu */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
}

/* Nav Links — simple text inside bubble */
.nav-link {
    font-weight: var(--font-weight-medium);
    font-size: 0.9375rem;
    color: rgba(226, 232, 240, 0.75);
    text-decoration: none;
    padding: 0.5rem 1.1rem;
    border-radius: var(--border-radius-full);
    transition: all var(--transition-base);
    position: relative;
    border: none;
    background: transparent;
}

.nav-link:hover {
    color: #FFFFFF;
    background-color: rgba(255, 255, 255, 0.1);
}

.nav-link:active {
    transform: translateY(0);
}

/* CTA Button in Nav */
.nav-menu .btn.btn-primary {
    background: var(--gradient-primary);
    border: none;
    padding: 0.6rem 1.5rem;
    font-size: 0.9375rem;
    border-radius: var(--border-radius-full);
    box-shadow: 0 2px 12px rgba(59, 130, 246, 0.3);
    transition: all var(--transition-base);
}

.nav-menu .btn.btn-primary:hover {
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.45);
    transform: translateY(-1px);
}

/* Language Switcher */
.lang-switcher {
    display: flex;
    align-items: center;
    margin-left: 0.25rem;
}

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 2px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--border-radius-full);
    padding: 3px 4px;
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: var(--font-primary);
}

.lang-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.12);
}

.lang-option {
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
    color: rgba(226, 232, 240, 0.45);
    padding: 3px 10px;
    border-radius: var(--border-radius-full);
    transition: all var(--transition-base);
    line-height: 1;
    letter-spacing: 0.02em;
}

.lang-option.active {
    background: var(--color-primary);
    color: #fff;
}

.lang-separator {
    color: rgba(226, 232, 240, 0.2);
    font-size: 0.75rem;
    line-height: 1;
    user-select: none;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-md);
    transition: background-color var(--transition-fast);
}

.mobile-menu-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.hamburger-line {
    width: 22px;
    height: 2px;
    background-color: #E2E8F0;
    transition: all var(--transition-base);
    border-radius: 2px;
}

/* Mobile Menu Styles */
@media (max-width: 768px) {
    .site-header {
        padding: 10px 0;
    }

    .navbar .container {
        padding: 0.45rem 0.6rem 0.45rem 1.2rem;
    }

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

    .nav-menu {
        position: fixed;
        top: calc(var(--header-height-mobile) + 8px);
        left: var(--container-padding-mobile);
        right: var(--container-padding-mobile);
        background-color: rgba(15, 23, 42, 0.95);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        gap: 0.25rem;
        padding: var(--spacing-md);
        border: 1px solid rgba(59, 130, 246, 0.12);
        border-radius: var(--border-radius-xl);
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
        transform: translateY(-20px);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-menu li {
        width: 100%;
    }

    .nav-link {
        display: block;
        padding: 0.75rem 1.25rem;
        font-size: var(--font-size-md);
        border-radius: var(--border-radius-lg);
    }

    .nav-link:hover {
        background-color: rgba(255, 255, 255, 0.08);
    }

    .lang-switcher {
        margin-left: 0;
        margin-right: 0;
        margin-top: 0.5rem;
        justify-content: center;
        padding: 0.25rem 0;
    }

    .nav-menu .btn {
        margin-top: 0.5rem;
        width: 100%;
        text-align: center;
        justify-content: center;
    }

    /* Hamburger Animation */
    .mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
}