/* ============================================
   TOPBAR / NAVIGATION
   ============================================ */
.topbar {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background: rgba(15, 15, 15, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: var(--border-width) solid var(--color-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    max-width: var(--container-max);
    margin-inline: auto;
    padding: var(--space-3) var(--container-padding);
}

.nav__links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: clamp(var(--space-2), 3vw, var(--space-6));
}

.nav__links a {
    position: relative;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: color var(--transition-fast);
}

.nav__links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: calc(100% - var(--space-4));
    height: 2px;
    background: var(--color-cyan-400);
    border-radius: var(--radius-full);
    transition: transform var(--transition-base);
}

.nav__links a:hover {
    color: var(--color-text-primary);
}

.nav__links a:hover::after {
    transform: translateX(-50%) scaleX(1);
}

/* === THEME TOGGLE === */
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background: rgba(255, 255, 255, 0.08);
    border: var(--border-width) solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-primary);
    font-size: 1.125rem;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    transform: translateY(-2px);
    background: var(--color-cyan-400);
    color: var(--color-bg-primary);
    border-color: var(--color-cyan-400);
}

.theme-light .theme-toggle {
    background: rgba(0, 0, 0, 0.05);
}

.theme-light .theme-toggle:hover {
    background: var(--color-cyan-500);
    color: white;
}

/* === CV button === */
.cv-download-btn {
    background: var(--color-cyan-500);
    color: #e0f7fa;
}

.cv-download-btn:hover {
    transform: translateY(-2px);
    background: var(--color-cyan-400);
    color: var(--color-bg-primary);
    border-color: var(--color-cyan-400);
}