.navigation {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem 2.5rem;
    transition: all var(--transition-smooth);
}

/* Scrolled State */
.navigation.scrolled {
    padding: 1rem 2.5rem;
    background: rgba(var(--bg-dark-rgb), 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-dark);
}

/* Hidden State (scroll down) */
.navigation.hidden {
    transform: translateY(-100%);
}

/* Menu Button */
.menu-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-white);
    padding: 0.5rem;
    margin: -0.5rem;
    border-radius: 4px;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.menu-btn::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--text-white);
    transition: width var(--transition-smooth);
}

.menu-btn:hover::after {
    width: 100%;
}

.menu-btn:hover {
    opacity: 0.8;
}

.menu-btn svg {
    transition: transform var(--transition-fast);
}

.menu-btn:hover svg {
    transform: scale(1.1);
}

.menu-btn span {
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

/* Logo */
.logo {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 0.875rem;
    transition: all var(--transition-smooth);
}

.logo-image {
    height: 36px;
    width: auto;
    object-fit: contain;
    opacity: 0.9;
    transition: all var(--transition-smooth);
}

.logo:hover .logo-image {
    opacity: 1;
    transform: scale(1.05);
}

.logo h1 {
    font-size: clamp(0.875rem, 1.5vw, 1.125rem);
    font-weight: 600;
    letter-spacing: 0.15em;
    margin: 0;
    transition: all var(--transition-smooth);
    white-space: nowrap;
}

.logo-line1,
.logo-line2 {
    display: inline;
}

/* Navigation Indicator */
.nav-indicator {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--text-white), transparent);
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.navigation.scrolled .nav-indicator {
    opacity: 0.3;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* ============================================
   SCROLL TO TOP BUTTON
   ============================================ */

.scroll-top-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 99;
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    background: rgba(var(--text-white-rgb), 0.08);
    border: 1px solid rgba(var(--text-white-rgb), 0.15);
    color: var(--text-white);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    opacity: 0;
    transform: translateY(12px);
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease, background 0.2s ease, border-color 0.2s ease;
}

.scroll-top-btn.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.scroll-top-btn:hover {
    background: rgba(var(--text-white-rgb), 0.15);
    border-color: rgba(var(--text-white-rgb), 0.35);
}

.scroll-top-btn:hover svg {
    transform: translateY(-2px);
}

.scroll-top-btn svg {
    transition: transform 0.2s ease;
}

@media (max-width: 1024px) {
    .navigation {
        padding: 1.25rem 2rem;
    }

    .logo-image {
        height: 32px;
    }

    .scroll-top-btn {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 2.75rem;
        height: 2.75rem;
    }
}

/* ============================================
   MOBILE NAVIGATION
   ============================================ */

@media (max-width: 768px) {
    .navigation {
        padding: 1rem 1.25rem;
        justify-content: space-between;
    }

    .navigation.scrolled {
        padding: 0.875rem 1.25rem;
    }

    .menu-btn span {
        display: none;
    }

    .menu-btn,
    .nav-actions {
        flex-shrink: 0;
    }

    .logo {
        position: absolute;
        left: 45%;
        transform: translateX(-50%);
        flex: unset;
        justify-content: center;
        max-width: calc(100% - 10rem);
        white-space: normal;
        overflow: visible;
        gap: 0.625rem;
        align-items: center;
    }

    .logo-image {
        height: 28px;
        flex-shrink: 0;
    }

    /* Stack the two text lines */
    .logo h1 {
        font-size: 0;
        margin: 0;
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        white-space: nowrap;
        letter-spacing: 0;
    }

    .logo-line1 {
        display: block;
        font-size: 0.8rem;
        font-weight: 700;
        letter-spacing: 0.12em;
        line-height: 1.1;
    }

    .logo-line2 {
        display: block;
        font-size: 0.6rem;
        font-weight: 500;
        letter-spacing: 0.12em;
        line-height: 1.2;
        opacity: 0.75;
    }

    .theme-toggle {
        width: 52px;
        height: 26px;
        padding: 3px;
    }

    .tt-thumb,
    .tt-alt {
        width: 20px;
        height: 20px;
    }

    html[data-theme="light"] .tt-thumb {
        transform: translateX(26px);
    }

    html[data-theme="light"] .tt-alt {
        transform: translateX(-26px);
    }
}

/* Very small screens */
@media (max-width: 360px) {
    .navigation {
        padding: 0.875rem 1rem;
    }

    .logo-image {
        height: 22px;
    }

    .logo-line1 {
        font-size: 0.7rem;
    }

    .logo-line2 {
        font-size: 0.55rem;
    }

    .nav-actions {
        gap: 0.5rem;
    }
}

/* ============================================
   MOBILE NAVIGATION - FLEXBOX VERSION (No overlap)
   ============================================ */

@media (max-width: 768px) {
    .navigation {
        padding: 1rem 1.25rem;
        justify-content: space-between;   /* Left | Center | Right */
    }

    .logo {
        position: static;
        transform: none;
        left: auto;
        max-width: none;
        flex: 1;
        display: flex;
        justify-content: center;
        align-items: center;
        padding: 0 10px;
        min-width: 0;
    }

    .menu-btn,
    .nav-actions {
        flex-shrink: 0;                   /* Prevent buttons from shrinking */
    }

    .nav-actions {
        gap: 6px;
    }

    /* Compact language toggle */
    .lang-toggle {
        min-width: 34px;
        height: 32px;
        padding: 0 7px;
        font-size: 0.8rem;
        font-weight: 700;
    }

    .logo-image {
        height: 28px;
        flex-shrink: 0;
    }

    .logo h1 {
        font-size: 0;
        display: flex;
        flex-direction: column;
        align-items: center;              /* Center the stacked text */
        gap: 0;
        white-space: nowrap;
        letter-spacing: 0;
        text-align: center;
    }

    .logo-line1 {
        font-size: 0.82rem;
        font-weight: 700;
        letter-spacing: 0.12em;
    }

    .logo-line2 {
        font-size: 0.62rem;
        font-weight: 500;
        letter-spacing: 0.12em;
        opacity: 0.8;
    }
}

@media (max-width: 420px) {
    .navigation {
        padding: 0.95rem 1.1rem;
    }

    .nav-actions {
        gap: 4px;
    }

    .lang-toggle {
        min-width: 32px;
        padding: 0 6px;
        font-size: 0.76rem;
    }

    .theme-toggle {
        width: 46px;
        height: 23px;
        padding: 2px;
    }

    .tt-thumb,
    .tt-alt {
        width: 17px;
        height: 17px;
    }

    html[data-theme="light"] .tt-thumb {
        transform: translateX(23px);
    }
}

@media (max-width: 360px) {
    .navigation {
        padding: 0.85rem 1rem;
    }

    .logo-image {
        height: 26px;
    }

    .logo-line1 {
        font-size: 0.78rem;
    }

    .logo-line2 {
        font-size: 0.58rem;
    }

    .lang-toggle {
        min-width: 31px;
        padding: 0 5px;
        font-size: 0.74rem;
    }
}