:root {
    --header-bg: rgba(20, 22, 34, 0.95);
    --header-border: rgba(255, 255, 255, 0.08);
    --header-text: #f0f0f0;
    --header-accent: #00ffcc;
    --header-muted: #a0a5c0;
}

header {
    background-color: var(--header-bg);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    max-width: 1400px;
    margin: 0 auto;
    flex-wrap: nowrap;
    gap: 20px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: 1px;
    white-space: nowrap;
}

.logo span {
    color: var(--header-accent);
}

.menu {
    display: flex;
    gap: 20px;
    flex: 1;
    justify-content: center;
}

.menu a {
    color: var(--header-text);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    white-space: nowrap;
}

.menu a:hover,
.menu a.active {
    color: var(--header-accent);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 15px;
    white-space: nowrap;
}

.navbar .search {
    background-color: #2a2e42;
    border: 1px solid #3d4360;
    color: white;
    padding: 8px 15px;
    border-radius: 20px;
    outline: none;
    transition: border-color 0.3s;
    width: 180px;
}

.navbar .search::placeholder {
    color: rgba(255, 255, 255, 0.55);
}

.navbar .search:focus {
    border-color: var(--header-accent);
    width: 220px;
}

.login-btn {
    padding: 8px 14px;
    border-radius: 20px;
    color: #7bf2b6;
    font-weight: 700;
    border: 1px solid rgba(123, 242, 182, 0.2);
    background: transparent;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.user-menu {
    display: none;
    align-items: center;
    gap: 10px;
    background-color: #0b151e;
    padding: 6px 12px;
    border-radius: 8px;
    color: var(--header-accent);
    font-weight: 500;
    border: 1px solid #162a3c;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-icon {
    width: 20px;
    height: 20px;
    stroke: var(--header-accent);
}

.username-text {
    color: var(--header-accent);
    text-decoration: none;
    max-width: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.logout-btn {
    background-color: transparent;
    border: 1px solid #162a3c;
    border-radius: 8px;
    padding: 6px 10px;
    color: #a0a5c0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.logout-btn:hover {
    background-color: #1a2236;
    color: #fff;
    border-color: #2d3748;
}

.logout-icon {
    width: 18px;
    height: 18px;
    stroke: #a0a5c0;
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        text-align: center;
    }
    .nav-right {
        width: 100%;
        flex-direction: column;
    }
    .search {
        width: 100%;
    }
}