.navbar {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--border-light);
    padding: 1rem 0;
    box-shadow: 0 1px 0 0 rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all 0.2s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.hamburger-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 22px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
    position: relative;
}

.hamburger-line {
    width: 100%;
    height: 2.5px;
    background: var(--text-color);
    border-radius: 2px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: center;
}

.hamburger-btn:hover .hamburger-line {
    background: var(--primary-color);
}

.hamburger-btn.active .hamburger-line:nth-child(1) {
    transform: translateY(9.5px) rotate(45deg);
}

.hamburger-btn.active .hamburger-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.hamburger-btn.active .hamburger-line:nth-child(3) {
    transform: translateY(-9.5px) rotate(-45deg);
}

.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 0;
    visibility: hidden;
    transition:
        opacity 0.4s ease,
        visibility 0.4s ease;
    z-index: 999;
    pointer-events: none;
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    width: min(85vw, 320px);
    background: var(--bg-color);
    border-radius: 1rem 0 0 1rem;
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.2);
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    overflow-y: auto;
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    pointer-events: none;
    visibility: hidden;
}

.mobile-menu.active {
    transform: translateX(0);
    pointer-events: auto;
    visibility: visible;
}

.mobile-menu-item {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    color: var(--text-color);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.2s ease;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    min-height: 44px;
    border-radius: 0.5rem;
}

.mobile-menu-item:hover {
    background-color: var(--bg-secondary);
    color: var(--primary-color);
}

.mobile-menu-logout {
    color: var(--danger-color);
    font-weight: 600;
}

.mobile-menu-logout:hover {
    background-color: rgba(212, 122, 122, 0.12);
    color: var(--danger-color);
}

.mobile-menu-divider {
    height: 1px;
    background: var(--border-color);
    margin: 0.75rem 0;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: -0.02em;
    transition: all 0.2s ease;
    position: relative;
    display: inline-block;
}

.nav-brand a:hover {
    color: var(--primary-hover);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

@media (max-width: 768px) {
    .hamburger-btn {
        display: flex !important;
    }

    .nav-links {
        display: none !important;
    }
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--primary-color);
}

.user-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.user-dropdown {
    position: relative;
}

.user-menu-btn {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    cursor: pointer;
    padding: 0.625rem 0.875rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: var(--text-color);
    border-radius: 0.625rem;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    font-weight: 500;
}

.user-menu-btn:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
}

.user-menu-btn:active {
    box-shadow: var(--shadow-sm);
}

.user-menu-btn[aria-expanded="true"] {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.user-icon {
    color: currentColor;
    transition: transform 0.2s ease;
}

.dropdown-arrow {
    color: currentColor;
    transition: transform 0.2s ease;
    opacity: 0.7;
}
.user-menu-btn[aria-expanded="true"] .dropdown-arrow {
    transform: rotate(180deg);
}

.user-dropdown-menu {
    position: absolute;
    top: calc(100% + 0.75rem);
    right: 0;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    box-shadow:
        0 10px 25px -5px rgba(0, 0, 0, 0.1),
        0 8px 10px -6px rgba(0, 0, 0, 0.05);
    min-width: 240px;
    max-width: 280px;
    opacity: 0;
    visibility: hidden;
    transition:
        opacity 0.15s ease,
        visibility 0.15s ease,
        transform 0.15s ease;
    transform: translateY(-4px);
    z-index: 1000;
    overflow: hidden;
    pointer-events: none;
}

.user-dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
}

.user-dropdown-header {
    padding: 1.25rem 1rem;
    border-bottom: 1px solid var(--border-light);
    background: var(--bg-secondary);
}

.user-dropdown-email {
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.9375rem;
    margin-bottom: 0.375rem;
    word-break: break-word;
}

.user-dropdown-role {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    text-transform: capitalize;
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background: var(--bg-secondary);
    border-radius: 0.25rem;
}

.user-dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding: 0.875rem 1rem;
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: all 0.15s ease;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    position: relative;
}

.user-dropdown-item::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--primary-color);
    opacity: 0;
    transition: opacity 0.15s ease;
}

.user-dropdown-item:hover {
    background-color: var(--bg-secondary);
    padding-left: 1.25rem;
}

.user-dropdown-item:hover::before {
    opacity: 1;
}

.user-dropdown-item svg {
    color: var(--text-secondary);
    flex-shrink: 0;
    transition: color 0.15s ease;
}

.user-dropdown-item:hover svg {
    color: var(--primary-color);
}

.user-dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: 0.5rem 0;
}

.user-dropdown-logout {
    color: var(--danger-color);
    font-weight: 500;
}

.user-dropdown-logout:hover {
    background-color: rgba(212, 122, 122, 0.12);
    color: var(--danger-color);
}

.user-dropdown-logout:hover::before {
    background: var(--danger-color);
}

.user-dropdown-logout svg {
    color: var(--danger-color);
}

.user-dropdown-logout:hover svg {
    color: var(--danger-color);
}

.teach-dropdown {
    position: relative;
}

.teach-menu-trigger {
    position: relative;
    cursor: pointer;
}

.teach-dropdown-menu {
    position: absolute;
    top: calc(100% + 0.75rem);
    right: 0;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    box-shadow:
        0 10px 25px -5px rgba(0, 0, 0, 0.1),
        0 8px 10px -6px rgba(0, 0, 0, 0.05);
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transition:
        opacity 0.15s ease,
        visibility 0.15s ease,
        transform 0.15s ease;
    transform: translateY(-4px);
    z-index: 999;
    overflow: hidden;
    pointer-events: none;
}

.teach-dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
}

.teach-dropdown-item {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: all 0.15s ease;
}

.teach-dropdown-item:hover {
    background-color: var(--bg-secondary);
    color: var(--primary-color);
}

.main-content {
    flex: 1;
    padding: 2.5rem 0;
}

.footer {
    background: linear-gradient(
        180deg,
        var(--bg-color) 0%,
        var(--bg-secondary) 100%
    );
    border-top: 1px solid var(--border-light);
    padding: 2.5rem 0;
    margin-top: 4rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.05);
}