nav {
    width: 100%;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    padding: 10px 20px;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-primary);
    text-decoration: none;
}

.logo img {
    border-radius: var(--radius-md);
    transition: transform var(--transition-fast);
}

.logo:hover img {
    transform: scale(1.05);
}

.logo-animation {
    display: flex;
    gap: 3px;
}

.logo-circle {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-primary);
    animation: bounce 1s infinite alternate;
}

.circle-2 { animation-delay: 0.2s; }
.circle-3 { animation-delay: 0.4s; }

@keyframes bounce {
    to { transform: translateY(-4px); }
}

.logo-main {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-primary);
}

.logo-sub {
    font-size: 12px;
    opacity: 0.7;
    display: block;
    border-radius: var(--radius-lg);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-right: 5%;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-success);
    padding: 8px 14px;
    text-decoration: none;
    border-radius: 8px;
    position: relative;
    transition: all var(--transition-fast);
}

.nav-item:hover,
.nav-item.active {
    background: var(--color-hover);
    color: var(--color-primary);
}

.nav-item[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: -28px;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 8px;
    background: var(--color-card);
    color: var(--color-success);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    white-space: nowrap;
    font-size: 12px;
    opacity: 1;
    z-index: 1001;
}

.nav-label {
    color: #ffffff;
}

.dropdown {
    position: relative;
}

.dropdown-menu,
.dropdown-content,
.profile-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--color-card);
    padding: 0.75rem 0;
    border-radius: var(--radius-md);
    display: none;
    min-width: 200px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    animation: dropdownFade 0.2s ease;
}

@keyframes dropdownFade {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.dropdown-menu a,
.dropdown-content a,
.profile-menu a {
    padding: 0.75rem 1.25rem;
    color: var(--color-text);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all var(--transition-fast);
}

.dropdown-menu a:hover,
.dropdown-content a:hover,
.profile-menu a:hover {
    background: var(--color-hover);
    color: var(--color-primary);
}

.dropdown:hover .dropdown-menu,
.nav-dropdown:hover .dropdown-content,
.user-profile:hover .profile-menu {
    display: block;
}

.theme-switch {
    display: flex;
    align-items: center;
}

.theme-toggle {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--color-hover);
    transform: translateY(-2px);
}

.user-profile {
    position: relative;
}

.profile-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);
    padding: 8px;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.profile-btn:hover {
    background: var(--color-hover);
}

.avatar {
    position: relative;
    width: 36px;
    height: 36px;
    background: var(--gradient-card);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.avatar i {
    font-size: 1rem;
    color: var(--color-primary);
}

.status-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    position: absolute;
    bottom: 0;
    right: 0;
    border: 2px solid var(--color-card);
}

.status-indicator.online {
    background: var(--color-success);
}

.write-btn {
    background: var(--gradient-primary);
    padding: 10px 20px;
    color: var(--color-bg);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-fast);
}

.write-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow-primary);
}

.search-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 2000;
}

.profile-menu.show {
    display: block;
}

.search-overlay.active {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 100px;
}

.search-container {
    background: var(--color-card);
    padding: 2rem;
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 600px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
}

.search-input {
    width: 100%;
    padding: 1rem 1.5rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--glow-primary);
}

.article-card {
    cursor: pointer;
}

.event-register:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.challenge-btn:hover {
    transform: scale(1.05);
    transition: transform 0.2s;
}

@media (max-width: 1080px) {
    .write-btn span {
        display: none;
    }
    .write-btn {
        padding: 10px;
    }
}

@media (max-width: 950px) {
    .user-profile .user-name,
    .theme-switch {
        display: none;
    }
}

@media (max-width: 820px) {
    .nav-link,
    .nav-actions {
        display: none;
    }
    
    .mobile-toggle {
        display: flex;
        flex-direction: column;
        gap: 4px;
        background: none;
        border: none;
        cursor: pointer;
        padding: 8px;
    }
    
    .mobile-toggle .bar {
        width: 24px;
        height: 2px;
        background: var(--color-text);
        border-radius: 2px;
    }
}