.nav {
    position: absolute;
    top: var(--nav-top-offset);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: min(980px, calc(100vw - 48px));
    max-width: none;
    height: 56px;
    padding: 0 16px;
    box-sizing: border-box;
    gap: 16px;
    border: 1px solid var(--panel-border-strong);
    border-radius: 18px;
    background: var(--panel-bg);
    box-shadow: var(--panel-shadow);
    color: var(--color);
    font-size: 13px;
    z-index: 1000;
}

.nav-c {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: min(980px, calc(100vw - 48px));
    height: 100%;
    clip-path: inset(var(--nav-top-offset) 0 calc(100% - 56px - var(--nav-top-offset)) 0 round 16px);
    user-select: none;
    backdrop-filter: blur(24px) saturate(140%);
    -webkit-backdrop-filter: blur(24px) saturate(140%);
    z-index: 1000;
}

.nav-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: calc(24px + 56px);
    background: var(--before-nav-bg);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    mask-image: linear-gradient(to bottom, #000 20%, transparent 80%);
    pointer-events: none;
    z-index: 999;
}

.nav-brand {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    flex-shrink: 0;
    color: var(--color-primary);
    font-family: var(--heading-font);
    font-size: 1.45rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1;
    text-decoration: none;
    white-space: nowrap;
}

.nav-brand__icon {
    width: 28px;
    height: 28px;
    border: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    min-width: 0;
    gap: 2px;
}

.nav-item {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    padding: 0 10px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--faint-text);
    font: inherit;
    font-family: var(--body-font);
    text-decoration: none;
    transition: color 0.2s, background 0.2s;
}

.nav-item:hover {
    color: var(--color);
    background: var(--highlight);
}

.nav-actions {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    gap: 10px;
}

.nav-actions .btn {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 36px;
    padding: 0 16px;
    border-radius: 999px;
    background: var(--btn-light-bg);
    color: var(--bg-primary);
    font-family: var(--body-font);
    font-weight: 600;
    letter-spacing: 0.01em;
    text-shadow: none;
    text-decoration: none;
    transition: background 0.2s, transform 0.2s, color 0.2s;
}

.nav-actions .btn:hover {
    background: #fff;
    transform: translateY(-1px);
}

.nav-actions .btn-outline {
    border: 1px solid var(--card-border);
    background: transparent;
    color: var(--color);
}

.nav-actions .btn-outline:hover {
    background: var(--panel-bg-strong);
    color: var(--color);
}

.nav a:not(.btn),
.nav a:not(.btn):visited,
.download-mobile-menu a:not(.btn),
.download-mobile-menu a:not(.btn):visited {
    color: var(--text-translucent);
    text-decoration: none;
    transition: color 0.2s;
}

.nav .nav-item:hover,
.nav .nav-item:hover:visited,
.download-mobile-menu .nav-item:hover,
.download-mobile-menu .nav-item:hover:visited {
    color: var(--color);
}

.mobile-quick-download,
.hamburger-btn,
.download-mobile-menu {
    display: none;
}

.hamburger-btn {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    padding: 0;
    gap: 6px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: color-mix(in srgb, var(--bg-primary) 45%, transparent);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    cursor: pointer;
}

.hamburger-line {
    display: block;
    width: 18px;
    height: 2px;
    border-radius: 2px;
    background: var(--color-primary);
    transition: transform 0.25s cubic-bezier(0.25, 1, 0.5, 1), opacity 0.2s ease;
}

.hamburger-btn[aria-expanded="true"] .hamburger-line:first-child {
    transform: translateY(7px) rotate(45deg);
}

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

.hamburger-btn[aria-expanded="true"] .hamburger-line:last-child {
    transform: translateY(-7px) rotate(-45deg);
}

.nav-brand:focus-visible,
.nav-item:focus-visible,
.nav-actions .btn:focus-visible,
.mobile-quick-download:focus-visible,
.hamburger-btn:focus-visible {
    outline: 1px solid var(--color-accent);
    outline-offset: 2px;
}

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

@media only screen and (max-width: 1000px) {
    .nav-links,
    .nav-actions {
        display: none;
    }

    .hamburger-btn {
        display: flex;
    }

    .nav a.mobile-quick-download,
    .nav a.mobile-quick-download:visited {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        min-height: 36px;
        margin-left: auto;
        padding: 0 13px;
        border-radius: 999px;
        background: var(--btn-light-bg);
        color: var(--bg-primary);
        font-size: 13px;
        font-weight: 650;
        text-decoration: none;
    }

    .download-mobile-menu:not([hidden]) {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: calc(var(--nav-top-offset) + 64px);
        left: 50%;
        transform: translateX(-50%);
        width: min(980px, calc(100vw - 48px));
        padding: 12px 16px;
        box-sizing: border-box;
        border: 1px solid var(--panel-border-strong);
        border-radius: 18px;
        background: var(--panel-bg-strong);
        box-shadow: var(--panel-shadow);
        backdrop-filter: blur(24px) saturate(140%);
        -webkit-backdrop-filter: blur(24px) saturate(140%);
        z-index: 1001;
    }

    .download-mobile-menu .nav-brand {
        min-height: 44px;
        padding: 6px 10px 10px;
        box-sizing: border-box;
    }

    .download-mobile-links,
    .download-mobile-actions {
        display: flex;
        flex-direction: column;
        gap: 3px;
        padding: 8px 0;
        border-top: 1px solid var(--card-border);
    }

    .download-mobile-menu .nav-item {
        justify-content: flex-start;
        min-height: 44px;
        padding: 0 10px;
        border-radius: 12px;
    }

    .download-mobile-actions .btn {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        height: 44px;
        box-sizing: border-box;
        border-radius: 12px;
        background: var(--btn-light-bg);
        color: var(--bg-primary);
        font-weight: 650;
        text-decoration: none;
    }

    .download-mobile-actions .btn-outline,
    .download-mobile-actions .btn-outline:visited {
        border: 1px solid var(--card-border);
        background: transparent;
        color: var(--color);
    }
}