/* TODO: Review box-shadow values - consider using design system shadow variables (--shadow-xs, --shadow-sm, etc.) */
/**
 * Header Navigation Improvements
 * Modern, polished header with better organization
 */

/* Header Container */
header {
    background: linear-gradient(135deg, rgba(var(--color-info-rgb, 91, 192, 222), 0.08), rgba(var(--color-info-rgb, 91, 192, 222), 0.03));
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(var(--color-text-primary-rgb, 224, 224, 224), 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px) saturate(180%);
    transition: all var(--transition-base);
    animation: headerSlideDown 0.5s ease-out;

@keyframes headerSlideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);

    to {
        opacity: 1;
        transform: translateY(0);

header:hover {
    box-shadow: var(--shadow-md), inset 0 1px 0 rgba(var(--color-text-primary-rgb, 224, 224, 224), 0.05);
    border-color: var(--color-border-light);

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: var(--spacing-sm);
    height: 100%;
    background: linear-gradient(180deg, var(--color-info), var(--color-success));
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
    box-shadow: var(--glow-blue);
    animation: accentPulse 3s ease-in-out infinite;

@keyframes accentPulse {
    0%, 100% {
        opacity: 1;
        box-shadow: var(--glow-blue);

    50% {
        opacity: 0.8;
        box-shadow: var(--glow-blue), 0 0 20px rgba(var(--color-info-rgb, 91, 192, 222), 0.5);

/* Header Title */
header h1 {
    margin: 0 0 var(--spacing-sm) 0;
    font-size: var(--font-size-2xl);
    font-family: var(--font-heading);
    font-weight: var(--font-weight-black);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    color: var(--color-text-primary);
    text-shadow: 0 0 20px rgba(var(--color-info-rgb, 91, 192, 222), 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    position: relative;

header h1::after {
    content: '';
    position: absolute;
    bottom: -var(--spacing-sm);
    left: 50%;
    transform: translateX(-50%);
    width: 104px;
    height: calc(var(--spacing-xs) / 2);
    background: linear-gradient(90deg, transparent, var(--color-info), transparent);
    animation: titleUnderline 2s ease-in-out infinite;

@keyframes titleUnderline {
    0%, 100% {
        width: 104px;
        opacity: 0.6;

    50% {
        width: 152px;
        opacity: 1;

/* Header Info Container */
.header-info {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: var(--spacing-md) var(--spacing-lg);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    width: 100%;

@media (max-width: 1200px) {
    .header-info {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);

    .header-info-left,
    .header-nav-links,
    .header-info-right {
        justify-content: center;
        width: 100%;

/* Left Section - Session Info */
.header-info-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: flex-start;
    min-width: 0;

.session-id {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    flex-shrink: 0;

.session-id::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(var(--color-info-rgb, 91, 192, 222), 0.2), transparent);
    transition: left 0.5s ease;

.session-id:hover::before {
    left: 100%;

.session-id:hover {
    border-color: var(--color-info);
    box-shadow: var(--shadow-sm);

#session-code {
    color: var(--color-info);
    font-family: var(--font-heading);
    letter-spacing: var(--letter-spacing-tight);
    font-weight: var(--font-weight-bold);
    padding: calc(var(--spacing-xs) / 2) calc(var(--spacing-xs) * 1.5);
    background: rgba(var(--color-info-rgb, 91, 192, 222), 0.1);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);

#session-code:hover {
    background: rgba(var(--color-info-rgb, 91, 192, 222), 0.2);
    transform: scale(1.05);

/* Mode Indicators */
.async-mode-indicator,
.async-turn-indicator {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-tight);
    transition: all var(--transition-base);
    white-space: nowrap;
    flex-shrink: 0;

.async-mode-indicator.async-on {
    background: rgba(var(--color-success-rgb, 92, 184, 92), 0.2);
    border-color: var(--color-success);
    color: var(--color-success);
    box-shadow: var(--glow-green);
    animation: asyncPulse 2s ease-in-out infinite;

@keyframes asyncPulse {
    0%, 100% {
        box-shadow: var(--glow-green);

    50% {
        box-shadow: var(--glow-green), 0 0 15px rgba(var(--color-success-rgb, 92, 184, 92), 0.6);

/* Center Section - Navigation Links */
.header-nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: nowrap;
    justify-content: center;
    white-space: nowrap;
    min-width: 0;

.header-nav-link {
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-normal);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    position: relative;
    border: 1px solid transparent;
    white-space: nowrap;
    flex-shrink: 0;

.header-nav-link:hover {
    color: var(--color-info);
    background: rgba(var(--color-info-rgb, 91, 192, 222), 0.1);
    border-color: var(--color-info);
    transform: translateY(-2px);

.header-nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: calc(var(--spacing-xs) / 2);
    background: var(--color-info);
    transition: transform var(--transition-base);

.header-nav-link:hover::after {
    transform: translateX(-50%) scaleX(1);

/* Right Section - User Actions */
.header-info-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    justify-content: flex-end;
    min-width: 0;

.header-user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    white-space: nowrap;
    flex-shrink: 0;

/* Header Buttons */
.header-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-family: var(--font-body);
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-tight);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    border: 1px solid;
    position: relative;
    overflow: hidden;
    white-space: nowrap;

.header-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: var(--radius-full);
    background: rgba(var(--color-text-primary-rgb, 224, 224, 224), 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;

.header-btn:hover::before {
    width: 304px;
    height: 304px;

.header-btn.btn-info {
    background: linear-gradient(135deg, var(--color-info), var(--color-info-dark));
    border-color: var(--color-info);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-sm);

.header-btn.btn-info:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow-blue), var(--shadow-md);

.header-btn.btn-secondary {
    background: var(--color-bg-tertiary);
    border-color: var(--color-border);
    color: var(--color-text-primary);

.header-btn.btn-secondary:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-info);
    color: var(--color-info);

.header-btn:active {
    transform: translateY(0);

.header-btn:focus {
    outline: 2px solid var(--color-info);
    outline-offset: 2px;

/* Responsive */
@media (max-width: 1200px) {
    .header-info {
        grid-template-columns: 1fr;

    .header-info-left,
    .header-nav-links,
    .header-info-right {
        justify-content: center;
        width: 100%;

@media (max-width: 768px) {
    header {
        padding: var(--spacing-sm) var(--spacing-md);

    header h1 {
        font-size: var(--font-size-xl);

    .header-info {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);

    .header-info-left {
        flex-wrap: wrap;
        justify-content: center;

    .header-nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--spacing-xs);

    .header-info-right {
        flex-wrap: wrap;
        justify-content: center;

    .header-btn {
        flex: 0 1 auto;
        min-width: fit-content;
        font-size: var(--font-size-xs);
        padding: var(--spacing-xs) var(--spacing-sm);

    .session-id,
    .async-mode-indicator,
    .async-turn-indicator {
        font-size: var(--font-size-xs);

}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}