:root {
    --fu-indigo: #6366f1;
    --fu-indigo-deep: #4f46e5;
    --fu-violet: #8b5cf6;
    --fu-pink: #ec4899;
    --fu-surface: rgba(5, 8, 22, 0.92);
    --fu-stroke: rgba(99, 102, 241, 0.22);
    --fu-ease: cubic-bezier(0.2, 0.8, 0.2, 1);
    --fu-header-blur: 20px;
    --fu-radius-chip: 14px;
    --fu-shadow-header: 0 1px 0 rgba(255, 255, 255, 0.06), 0 12px 40px rgba(0, 0, 0, 0.35);
    --fu-nav-gap: 10px;
    --fu-safe-top: env(safe-area-inset-top, 0px);
    --fu-safe-right: env(safe-area-inset-right, 0px);
    --fu-safe-bottom: env(safe-area-inset-bottom, 0px);
    --fu-safe-left: env(safe-area-inset-left, 0px);
}

@media (prefers-reduced-motion: reduce) {
    .online-indicator,
    .online-dot {
        animation: none !important;
    }

    nav.fu-app-header a:hover,
    nav.fu-app-header button:hover,
    nav.fu-app-header a.user-info:hover,
    .feed-logo:hover,
    .fu-nav-btn-secondary:hover {
        transform: none;
    }
}

nav.fu-app-header {
    z-index: 400;
    overflow: visible;
    border-bottom: 1px solid var(--fu-stroke);
    background: linear-gradient(180deg, rgba(5, 8, 22, 0.97) 0%, rgba(8, 12, 28, 0.9) 100%);
    -webkit-backdrop-filter: blur(var(--fu-header-blur)) saturate(160%);
    backdrop-filter: blur(var(--fu-header-blur)) saturate(160%);
    box-shadow: var(--fu-shadow-header);
}

nav.fu-app-header.navbar {
    position: sticky;
    top: 0;
    padding: 0;
}

nav.fu-app-header.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: 0;
}

nav.fu-app-header .site-nav-inner,
nav.fu-app-header .navbar-content {
    box-sizing: border-box;
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding-top: max(12px, var(--fu-safe-top));
    padding-bottom: 12px;
    padding-left: max(16px, var(--fu-safe-left));
    padding-right: max(16px, var(--fu-safe-right));
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: clamp(12px, 2vw, 20px);
    flex-wrap: wrap;
}

@media (min-width: 1024px) {
    nav.fu-app-header .site-nav-inner,
    nav.fu-app-header .navbar-content {
        padding-left: max(clamp(20px, 4vw, 56px), var(--fu-safe-left));
        padding-right: max(clamp(20px, 4vw, 56px), var(--fu-safe-right));
        padding-bottom: 14px;
    }
}

@media (min-width: 1440px) {
    nav.fu-app-header .site-nav-inner,
    nav.fu-app-header .navbar-content {
        padding-left: max(clamp(24px, 4.5vw, 64px), var(--fu-safe-left));
        padding-right: max(clamp(24px, 4.5vw, 64px), var(--fu-safe-right));
    }
}

nav.fu-app-header.site-nav a.brand,
nav.fu-app-header .navbar-brand {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: clamp(16px, 2.5vw, 18px);
    letter-spacing: -0.02em;
    color: #fff;
    text-decoration: none;
    transition: color 0.2s var(--fu-ease), transform 0.2s var(--fu-ease);
}

nav.fu-app-header.site-nav a.brand:hover,
nav.fu-app-header .navbar-brand:hover {
    color: #a5b4fc;
    transform: translateY(-1px);
}

nav.fu-app-header.site-nav a.brand svg,
nav.fu-app-header .navbar-brand svg {
    width: clamp(22px, 4vw, 26px);
    height: clamp(22px, 4vw, 26px);
    flex-shrink: 0;
}

nav.fu-app-header .site-nav-links,
nav.fu-app-header .navbar-menu {
    display: flex;
    align-items: center;
    gap: var(--fu-nav-gap);
    flex-wrap: wrap;
    min-width: 0;
    flex: 1 1 auto;
    justify-content: flex-end;
    margin-left: auto;
    overflow: visible;
}

nav.fu-app-header .navbar-content,
nav.fu-app-header .site-nav-inner {
    overflow: visible;
}

nav.fu-app-header a.user-info {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 14px;
    min-height: 44px;
    box-sizing: border-box;
    max-width: min(280px, 100%);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.22) 0%, rgba(15, 23, 42, 0.82) 100%);
    border: 1px solid rgba(99, 102, 241, 0.4);
    border-radius: var(--fu-radius-chip);
    color: #f8fafc;
    text-decoration: none;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.18);
    transition: transform 0.2s var(--fu-ease), box-shadow 0.2s var(--fu-ease), border-color 0.2s var(--fu-ease), background 0.2s var(--fu-ease);
    -webkit-user-select: none;
    user-select: none;
}

nav.fu-app-header a.user-info:hover {
    transform: translateY(-2px);
    border-color: rgba(165, 180, 252, 0.55);
    box-shadow: 0 8px 22px rgba(99, 102, 241, 0.32);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.32) 0%, rgba(15, 23, 42, 0.88) 100%);
}

nav.fu-app-header .user-info .user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    overflow: hidden;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.35);
    font-size: 16px;
    line-height: 1;
}

nav.fu-app-header .user-info .user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

nav.fu-app-header .user-info .user-nav-meta {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
    text-align: left;
}

nav.fu-app-header .user-info .user-nav-name {
    font-weight: 700;
    font-size: 14px;
    color: #fff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

nav.fu-app-header .user-info .user-nav-role {
    font-size: 12px;
    font-weight: 600;
    color: #94a3b8;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

nav.fu-app-header .site-nav-links a:not(.nav-chip):not(.nav-btn-login),
nav.fu-app-header .site-nav-links button:not(.nav-btn-login) {
    padding: 10px 16px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    transition: transform 0.15s var(--fu-ease), box-shadow 0.15s var(--fu-ease);
}

nav.fu-app-header .site-nav-links a.nav-upload {
    background: linear-gradient(135deg, var(--fu-indigo) 0%, var(--fu-indigo-deep) 100%);
    color: #fff;
}

nav.fu-app-header .site-nav-links a:not(.nav-chip):hover,
nav.fu-app-header .site-nav-links button:not(.nav-btn-login):hover {
    transform: translateY(-1px);
}

.online-widget {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    min-height: 44px;
    box-sizing: border-box;
    background: rgba(34, 197, 94, 0.08);
    border: 1px solid rgba(34, 197, 94, 0.35);
    border-radius: var(--fu-radius-chip);
    font-size: 14px;
    transition: background 0.2s var(--fu-ease), border-color 0.2s var(--fu-ease), transform 0.2s var(--fu-ease);
}

.online-widget:hover {
    background: rgba(34, 197, 94, 0.14);
    border-color: rgba(34, 197, 94, 0.5);
    transform: translateY(-1px);
}

.online-indicator {
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    animation: fu-pulse-dot 2s ease-in-out infinite;
}

@keyframes fu-pulse-dot {
    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.55;
        transform: scale(1.15);
    }
}

.online-count {
    font-weight: 700;
    color: #4ade80;
}

.online-widget .online-text {
    color: #94a3b8;
    font-weight: 600;
}

@media (max-width: 768px) {
    nav.fu-app-header.site-nav .site-nav-inner {
        padding-top: max(10px, var(--fu-safe-top));
        padding-left: max(12px, var(--fu-safe-left));
        padding-right: max(12px, var(--fu-safe-right));
        padding-bottom: 10px;
    }
}

.fu-feed-topbar {
    position: fixed;
    z-index: 350;
    top: max(10px, calc(var(--fu-safe-top) + 4px));
    left: max(10px, var(--fu-safe-left));
    right: max(10px, var(--fu-safe-right));
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: space-between;
    gap: 10px min(12px, 2vw);
    pointer-events: none;
    overflow: visible;
}

.fu-feed-topbar > * {
    pointer-events: auto;
}

.fu-feed-topbar .feed-header,
.fu-feed-topbar .feed-header-right {
    position: static !important;
    top: auto !important;
    left: auto !important;
    right: auto !important;
}

.fu-feed-topbar .feed-header-right {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    min-width: 0;
    flex: 1 1 auto;
    justify-content: flex-end;
    overflow: visible;
}

.header-right-column {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
    min-width: 0;
}

a.feed-logo {
    font-size: clamp(15px, 3.8vw, 18px);
    font-weight: 800;
    color: #fff;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 11px 18px;
    min-height: 44px;
    box-sizing: border-box;
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.38) 0%, rgba(139, 92, 246, 0.32) 100%);
    -webkit-backdrop-filter: blur(24px) saturate(160%);
    backdrop-filter: blur(24px) saturate(160%);
    border: 1px solid rgba(236, 72, 153, 0.45);
    border-radius: var(--fu-radius-chip);
    box-shadow: 0 8px 28px rgba(236, 72, 153, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.08);
    position: relative;
    overflow: hidden;
    transition: background 0.22s var(--fu-ease), border-color 0.22s var(--fu-ease), box-shadow 0.22s var(--fu-ease), transform 0.22s var(--fu-ease);
    max-width: min(100vw - 24px, 420px);
}

a.feed-logo::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.18), transparent);
    transition: left 0.45s var(--fu-ease);
}

a.feed-logo:hover::before {
    left: 100%;
}

a.feed-logo:hover {
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.52) 0%, rgba(139, 92, 246, 0.45) 100%);
    transform: translateY(-2px);
    box-shadow: 0 12px 36px rgba(236, 72, 153, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.12);
    border-color: rgba(236, 72, 153, 0.65);
}

a.feed-logo svg {
    width: clamp(20px, 4.5vw, 24px);
    height: clamp(20px, 4.5vw, 24px);
    flex-shrink: 0;
}

.online-counter {
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.55) 0%, rgba(15, 23, 42, 0.45) 100%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    backdrop-filter: blur(20px) saturate(160%);
    border-radius: var(--fu-radius-chip);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid rgba(34, 197, 94, 0.35);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    max-width: 100%;
}

.online-dot {
    width: 9px;
    height: 9px;
    background: #10b981;
    border-radius: 50%;
    animation: fu-pulse-dot 2s ease-in-out infinite;
    flex-shrink: 0;
}

.online-counter .online-text {
    font-size: clamp(11px, 3vw, 13px);
    font-weight: 700;
    color: #fff;
    text-shadow: 0 1px 8px rgba(0, 0, 0, 0.6);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: min(56vw, 220px);
}

.fu-feed-topbar .feed-header-btn.fu-nav-btn-secondary {
    font-size: clamp(12px, 3.2vw, 14px);
}

@media (max-width: 768px) {
    .fu-feed-topbar {
        top: max(8px, calc(var(--fu-safe-top) + 2px));
        left: max(8px, var(--fu-safe-left));
        right: max(8px, var(--fu-safe-right));
        gap: 8px;
    }

    a.feed-logo {
        padding: 9px 14px;
        gap: 8px;
    }

    .fu-feed-topbar .feed-header-btn.fu-nav-btn-secondary {
        padding: 9px 16px;
    }

    .online-counter {
        padding: 8px 12px;
        gap: 8px;
    }

    .online-dot {
        width: 8px;
        height: 8px;
    }

    .online-counter .online-text {
        max-width: min(50vw, 200px);
    }
}

@media (max-width: 480px) {
    .fu-feed-topbar .feed-header-right {
        flex-direction: column;
        align-items: flex-end;
        gap: 6px;
    }

    .online-counter .online-text {
        max-width: min(72vw, 240px);
        white-space: normal;
        word-spacing: normal;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .fu-feed-topbar {
        gap: 10px 14px;
    }
}

@media (max-width: 768px) {
    nav.fu-app-header .site-nav-inner,
    nav.fu-app-header .navbar-content {
        flex-wrap: wrap;
        align-items: flex-start;
    }

    nav.fu-app-header.navbar .navbar-content {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    nav.fu-app-header.site-nav .site-nav-inner {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }

    nav.fu-app-header .navbar-menu,
    nav.fu-app-header .site-nav-links {
        width: 100%;
        margin-left: 0;
        flex: none;
        justify-content: flex-start;
        flex-wrap: wrap;
        gap: 8px;
    }

    nav.fu-app-header.navbar .navbar-menu .online-widget,
    nav.fu-app-header.site-nav .site-nav-links .online-widget {
        width: 100%;
        justify-content: center;
    }

    nav.fu-app-header.navbar .navbar-menu .fu-nav-btn-secondary,
    nav.fu-app-header.navbar .navbar-menu .nav-btn-login,
    nav.fu-app-header.site-nav .site-nav-links .nav-btn-login {
        flex: 1 1 auto;
        min-width: min(100%, 120px);
    }

    nav.fu-app-header.navbar .navbar-menu .btn:not(.nav-chip):not(.sections-dropdown__summary) {
        flex: 0 1 auto;
        min-width: min(100%, 110px);
        justify-content: center;
    }

    nav.fu-app-header a.user-info {
        max-width: 100%;
    }
}