.v4-top-nav,
.v4-mobile-menu {
    position: fixed;
    z-index: var(--z-nav);
    border: 1px solid var(--color-border);
    background: rgba(8, 15, 22, 0.88);
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow-soft);
}

.v4-top-nav {
    top: var(--space-4);
    left: 50%;
    width: min(calc(100% - 32px), var(--max-shell));
    max-width: calc(100vw - 32px);
    min-height: var(--nav-height);
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-5);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
}

.v4-brand {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    font-weight: 900;
    letter-spacing: 0.12em;
}

.v4-brand img {
    border-radius: 50%;
}

.v4-nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.v4-nav-links a,
.v4-mobile-menu a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    padding: 8px 14px;
    color: var(--color-muted);
    text-decoration: none;
    font-weight: 700;
    transition:
        color var(--transition-fast),
        background var(--transition-fast),
        transform var(--transition-fast);
}

.v4-nav-links a[aria-current="page"],
.v4-mobile-menu a[aria-current="page"] {
    color: var(--color-primary);
    background: rgba(78, 205, 196, 0.12);
}

.v4-nav-profile {
    border: 0;
    background: transparent;
    color: var(--color-muted);
    font-size: 0.9rem;
    cursor: pointer;
    border-radius: 999px;
    padding: 8px 10px;
    transition:
        color var(--transition-fast),
        background var(--transition-fast);
}

.v4-nav-profile:hover,
.v4-nav-profile:focus-visible {
    color: var(--color-primary);
    background: rgba(78, 205, 196, 0.1);
    outline: none;
}

.v4-menu-toggle {
    width: 48px;
    height: 48px;
    display: none;
    flex: 0 0 auto;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    border: 1px solid rgba(78, 205, 196, 0.28);
    border-radius: 16px;
    background:
        linear-gradient(180deg, rgba(78, 205, 196, 0.16), rgba(247, 255, 247, 0.04)),
        rgba(8, 15, 22, 0.84);
    color: var(--color-text);
    cursor: pointer;
    touch-action: manipulation;
    box-shadow: inset 0 1px 0 rgba(247, 255, 247, 0.08);
}

.v4-menu-toggle span {
    width: 20px;
    height: 2px;
    display: block;
    border-radius: 999px;
    background: currentColor;
    transform-origin: center;
    transition:
        opacity var(--transition-fast),
        transform var(--transition-fast);
}

.v4-menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.v4-menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.v4-menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.v4-menu-toggle:focus-visible,
.v4-mobile-menu a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.v4-mobile-menu {
    top: calc(var(--space-4) + var(--nav-height) + 10px);
    right: max(16px, calc((100vw - var(--max-shell)) / 2));
    width: min(320px, calc(100vw - 32px));
    display: grid;
    gap: 8px;
    padding: 10px;
    border-color: rgba(78, 205, 196, 0.32);
    border-radius: 24px;
    background:
        radial-gradient(circle at 82% 0%, rgba(78, 205, 196, 0.22), transparent 44%),
        linear-gradient(180deg, rgba(17, 29, 39, 0.96), rgba(5, 12, 18, 0.98));
    opacity: 1;
    transform: translateY(0) scale(1);
    transform-origin: top right;
    transition:
        opacity var(--transition-base),
        transform var(--transition-base);
}

.v4-mobile-menu[hidden] {
    display: none;
}

.v4-mobile-menu a {
    min-height: 58px;
    justify-content: flex-start;
    gap: 12px;
    padding: 10px 12px;
    border: 1px solid rgba(247, 255, 247, 0.08);
    border-radius: 18px;
    background: rgba(247, 255, 247, 0.04);
}

.v4-mobile-menu a:active {
    transform: scale(0.99);
}

.v4-mobile-menu-icon {
    position: relative;
    width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    flex: 0 0 auto;
    border: 1px solid rgba(247, 255, 247, 0.16);
    border-radius: 12px;
    background: rgba(247, 255, 247, 0.06);
}

.v4-mobile-menu-icon::before,
.v4-mobile-menu-icon::after {
    content: "";
    display: block;
    border-radius: 999px;
    background: currentColor;
}

.v4-mobile-menu a[data-v4-route="home"] .v4-mobile-menu-icon::before {
    width: 13px;
    height: 10px;
    border-radius: 3px;
}

.v4-mobile-menu a[data-v4-route="home"] .v4-mobile-menu-icon::after {
    position: absolute;
    width: 12px;
    height: 12px;
    border-radius: 2px;
    transform: translateY(-5px) rotate(45deg);
    background: transparent;
    border-top: 2px solid currentColor;
    border-left: 2px solid currentColor;
}

.v4-mobile-menu a[data-v4-route="explorer"] .v4-mobile-menu-icon::before {
    width: 13px;
    height: 13px;
    background: transparent;
    border: 2px solid currentColor;
}

.v4-mobile-menu a[data-v4-route="explorer"] .v4-mobile-menu-icon::after {
    position: absolute;
    width: 8px;
    height: 2px;
    transform: translate(7px, 7px) rotate(45deg);
}

.v4-mobile-menu a[data-v4-route="solo"] .v4-mobile-menu-icon::before {
    width: 8px;
    height: 8px;
    box-shadow:
        -7px 0 0 currentColor,
        7px 0 0 currentColor,
        0 7px 0 currentColor,
        0 -7px 0 currentColor;
}

.v4-mobile-menu a[data-v4-route="multiplayer"] .v4-mobile-menu-icon::before {
    width: 9px;
    height: 9px;
    box-shadow:
        -7px 6px 0 currentColor,
        7px 6px 0 currentColor;
}

.v4-mobile-menu a[data-v4-route="community"] .v4-mobile-menu-icon::before {
    width: 15px;
    height: 11px;
    background: transparent;
    border: 2px solid currentColor;
    border-radius: 5px;
}

.v4-mobile-menu a[data-v4-route="community"] .v4-mobile-menu-icon::after {
    position: absolute;
    width: 7px;
    height: 6px;
    transform: translate(5px, 8px) skewX(-24deg);
    border-radius: 1px;
}

.v4-mobile-menu a[aria-current="page"] .v4-mobile-menu-icon {
    border-color: rgba(78, 205, 196, 0.46);
    color: var(--color-primary);
    background: rgba(78, 205, 196, 0.16);
    box-shadow: 0 0 18px rgba(78, 205, 196, 0.2);
}