frontend/src/components/TopNav.css

.topnav {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-6);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-subtle);
    position: sticky;
    top: 0;
    z-index: 100;
}

.topnav-left {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.sidebar-toggle {
    display: flex;
}

.topnav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.brand-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
}

.brand-name {
    font-size: var(--text-lg);
    font-weight: 600;
    letter-spacing: -0.02em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.topnav-right {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-sm);
    font-weight: 600;
    color: white;
}

.user-name {
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn var(--transition-fast) ease;
}

.modal {
    width: 100%;
    max-width: 400px;
    margin: var(--space-4);
    animation: fadeInUp var(--transition-base) ease;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-6);
}

.modal-header h2 {
    font-size: var(--text-xl);
    font-weight: 600;
    letter-spacing: -0.02em;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.form-row {
    display: flex;
    gap: var(--space-3);
}

.form-row .form-group {
    flex: 1;
}

.form-group label {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

.auth-error {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: var(--error-bg);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-md);
    color: var(--error);
    font-size: var(--text-sm);
}

.auth-switch {
    text-align: center;
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.auth-switch button {
    background: none;
    border: none;
    color: var(--accent-primary);
    cursor: pointer;
    font-size: inherit;
    padding: 0;
}

.auth-switch button:hover {
    text-decoration: underline;
}

/* Loading Dots */
.loading-dots {
    display: flex;
    align-items: center;
    gap: 4px;
}

.loading-dots span {
    width: 6px;
    height: 6px;
    background: currentColor;
    border-radius: 50%;
    animation: bounce 1.4s ease-in-out infinite;
}

.loading-dots span:nth-child(1) {
    animation-delay: 0s;
}

.loading-dots span:nth-child(2) {
    animation-delay: 0.16s;
}

.loading-dots span:nth-child(3) {
    animation-delay: 0.32s;
}

@media (max-width: 768px) {
    .topnav {
        padding: 0 var(--space-4);
    }

    .brand-name {
        display: none;
    }

    .user-name {
        display: none;
    }
}