/* ========== NAVIGATION ========== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    z-index: 1000;
    transition: transform 0.4s var(--ease-out-expo),
                background 0.4s;
}

.nav::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(10, 10, 10, 0.6);
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    border-bottom: 1px solid var(--border);
    opacity: 0;
    transition: opacity 0.4s;
}

.nav.is-scrolled::before {
    opacity: 1;
}

[data-theme="light"] .nav::before {
    background: rgba(245, 245, 240, 0.7);
}

.nav.is-hidden {
    transform: translateY(-100%);
}

.nav__inner {
    position: relative;
    z-index: 1;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-primary);
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: 0.2em;
}

.nav__logo-dot {
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    animation: logoPulse 3s ease-in-out infinite;
}

@keyframes logoPulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.7); }
}

.nav__links {
    display: flex;
    gap: 32px;
}

.nav__link {
    position: relative;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    padding: 8px 0;
}

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

.nav__link-indicator {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent);
    transition: width 0.3s var(--ease-out-expo);
}

.nav__link:hover .nav__link-indicator,
.nav__link.is-active .nav__link-indicator {
    width: 100%;
}

.nav__link.is-active {
    color: var(--text-primary);
}

.nav__actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Theme toggle */
.nav__theme-toggle {
    position: relative;
    width: 48px;
    height: 24px;
}

.theme-toggle__track {
    width: 100%;
    height: 100%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 12px;
    position: relative;
    transition: background var(--transition-normal), border-color var(--transition-normal);
}

.theme-toggle__thumb {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background: var(--text-primary);
    border-radius: 50%;
    transition: transform 0.4s var(--ease-spring);
    display: flex;
    align-items: center;
    justify-content: center;
}

[data-theme="light"] .theme-toggle__thumb {
    transform: translateX(24px);
}

[data-theme="void"] .theme-toggle__thumb {
    transform: translateX(12px);
    background: var(--accent);
}

.theme-toggle__icon {
    width: 10px;
    height: 10px;
    position: absolute;
    transition: opacity 0.3s;
}

.theme-toggle__icon--dark {
    opacity: 1;
    color: var(--bg-primary);
}

.theme-toggle__icon--light {
    opacity: 0;
    color: var(--bg-primary);
}

[data-theme="light"] .theme-toggle__icon--dark {
    opacity: 0;
}

[data-theme="light"] .theme-toggle__icon--light {
    opacity: 1;
}

/* Mobile toggle */
.nav__mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 24px;
    height: 20px;
    justify-content: center;
}

.nav__mobile-toggle span {
    display: block;
    width: 100%;
    height: 1px;
    background: var(--text-primary);
    transition: transform 0.3s var(--ease-out-expo), opacity 0.3s;
    transform-origin: center;
}

.nav__mobile-toggle.is-active span:first-child {
    transform: translateY(6px) rotate(45deg);
}

.nav__mobile-toggle.is-active span:nth-child(2) {
    opacity: 0;
}

.nav__mobile-toggle.is-active span:last-child {
    transform: translateY(-6px) rotate(-45deg);
}

/* Mobile nav overlay */
.mobile-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 999;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

.mobile-nav.is-open {
    pointer-events: auto;
    opacity: 1;
    visibility: visible;
}

.mobile-nav__bg {
    position: absolute;
    inset: 0;
    background: var(--bg-primary);
    opacity: 0.97;
}

.mobile-nav__content {
    position: relative;
    z-index: 1;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 var(--container-padding);
}

.mobile-nav__links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mobile-nav__link {
    display: flex;
    align-items: baseline;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
    transform: translateY(30px);
    opacity: 0;
    transition: transform 0.5s var(--ease-out-expo), opacity 0.5s;
}

.mobile-nav.is-open .mobile-nav__link {
    transform: translateY(0);
    opacity: 1;
}

.mobile-nav.is-open .mobile-nav__link:nth-child(1) { transition-delay: 0.1s; }
.mobile-nav.is-open .mobile-nav__link:nth-child(2) { transition-delay: 0.15s; }
.mobile-nav.is-open .mobile-nav__link:nth-child(3) { transition-delay: 0.2s; }
.mobile-nav.is-open .mobile-nav__link:nth-child(4) { transition-delay: 0.25s; }
.mobile-nav.is-open .mobile-nav__link:nth-child(5) { transition-delay: 0.3s; }

.mobile-nav__link-number {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent);
    letter-spacing: 0.1em;
}

.mobile-nav__link-text {
    font-family: var(--font-primary);
    font-size: clamp(2rem, 8vw, 3.5rem);
    font-weight: 300;
    letter-spacing: 0.2em;
}

.mobile-nav__footer {
    position: absolute;
    bottom: 40px;
    left: var(--container-padding);
}

.mobile-nav__status {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--accent);
    letter-spacing: 0.1em;
}

@media (max-width: 768px) {
    .nav__links {
        display: none;
    }
    .nav__mobile-toggle {
        display: flex;
    }
}