.timeline {
    position: relative;
    margin: 3rem 0;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 1rem;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-accent);
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
    padding-left: 2rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 0.5rem;
    width: 1rem;
    height: 1rem;
    background: var(--color-accent);
    border-radius: 50%;
}

.timeline-year {
    font-weight: bold;
    color: var(--color-accent);
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.timeline-content {
    background: var(--color-bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--color-accent);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.tech-card {
    background: var(--color-bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: var(--transition-base);
    cursor: pointer;
}

.tech-card:hover {
    background: var(--color-bg-elevated);
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.tech-card h4 {
    margin-bottom: 0.5rem;
    color: var(--color-accent);
}

.tech-card .tech-status {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.tech-card .status-emerging {
    background: var(--color-warning);
    color: white;
}

.tech-card .status-developing {
    background: var(--color-accent);
    color: white;
}

.tech-card .status-future {
    background: var(--color-text-secondary);
    color: white;
}

.vision-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.vision-item {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
    color: white;
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
}

.vision-item h4 {
    margin-bottom: 0.5rem;
}

.vision-item p {
    margin: 0;
    font-size: 0.9rem;
    opacity: 0.9;
}

.roadmap {
    background: var(--color-bg-secondary);
    border-radius: 8px;
    padding: 2rem;
    margin: 2rem 0;
}

.roadmap h3 {
    margin-bottom: 1rem;
    color: var(--color-accent);
    text-align: center;
}

.roadmap-phase {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-border);
}

.roadmap-phase:last-child {
    border-bottom: none;
}

.phase-title {
    font-weight: bold;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
}

.phase-description {
    margin-bottom: 0.5rem;
}

.phase-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.phase-feature {
    background: var(--color-bg-primary);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    border: 1px solid var(--color-border);
}
.method-diagram {
    background: var(--color-bg-secondary);
    border-radius: 8px;
    padding: 2rem;
    margin: 2rem 0;
    text-align: center;
}

.method-diagram h3 {
    margin-bottom: 1rem;
    color: var(--color-accent);
}

.method-diagram p {
    margin-bottom: 1.5rem;
}

.method-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.method-step {
    background: var(--color-bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--color-accent);
}

.method-step h4 {
    margin-bottom: 0.5rem;
    color: var(--color-accent);
}

.method-step .step-number {
    display: inline-block;
    background: var(--color-accent);
    color: var(--color-bg-primary);
    padding: 0.25rem 0.5rem;
    border-radius: 50%;
    font-size: 0.8rem;
    font-weight: bold;
    margin-right: 0.5rem;
}
.tech-diagram {
    background: var(--color-bg-secondary);
    border-radius: 8px;
    padding: 2rem;
    margin: 2rem 0;
    text-align: center;
}

.tech-diagram h3 {
    margin-bottom: 1rem;
    color: var(--color-accent);
}

.protocol-stack {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin: 2rem 0;
}

.protocol-layer {
    background: var(--color-bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid var(--color-accent);
}

.protocol-layer h4 {
    margin-bottom: 0.5rem;
    color: var(--color-accent);
}

.protocol-layer .layer-name {
    font-weight: bold;
    display: block;
}

.protocol-layer .layer-desc {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.metric-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.metric-card {
    background: var(--color-bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: var(--transition-base);
    cursor: pointer;
}

.metric-card:hover {
    background: var(--color-bg-elevated);
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.metric-card h4 {
    margin-bottom: 0.5rem;
    color: var(--color-accent);
}

.metric-card .metric-value {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.metric-card .metric-unit {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.code-example {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1rem;
    margin: 1rem 0;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
    overflow-x: auto;
}

.code-example pre {
    margin: 0;
    white-space: pre-wrap;
}
.troubleshoot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.troubleshoot-card {
    background: var(--color-bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--color-accent);
    transition: var(--transition-base);
    cursor: pointer;
}

.troubleshoot-card:hover {
    background: var(--color-bg-elevated);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.troubleshoot-card h4 {
    margin-bottom: 0.5rem;
    color: var(--color-accent);
}

.troubleshoot-card .issue-type {
    display: inline-block;
    background: var(--color-error);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.solution-steps {
    background: var(--color-bg-secondary);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1rem 0;
}

.solution-steps ol {
    margin: 0;
    padding-left: 1.5rem;
}

.solution-steps li {
    margin-bottom: 0.5rem;
}

.diagnostic-tool {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1rem;
    margin: 1rem 0;
}

.diagnostic-tool h4 {
    margin-bottom: 0.5rem;
    color: var(--color-accent);
}

.diagnostic-tool .tool-command {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    padding: 0.5rem;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
    margin: 0.5rem 0;
}

.quick-fixes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.quick-fix {
    background: var(--color-success);
    color: white;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
}

.quick-fix h4 {
    margin-bottom: 0.5rem;
    color: white;
}

.quick-fix p {
    margin: 0;
    font-size: 0.9rem;
}

/* Styles for the Learn Hub Page */
.chapter-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: 2rem;
}
.chapter-item {
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--color-border);
}
.chapter-item:last-child {
    border-bottom: none;
}
.chapter-item h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}
.chapter-item h3 a {
    color: var(--color-text-primary);
    text-decoration: none;
    transition: color 0.2s;
}
.chapter-item h3 a:hover {
    color: var(--color-primary);
}
.chapter-item p {
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}
.chapter-meta {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    display: flex;
    gap: 1rem;
    align-items: center;
}
.chapter-meta span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}
.chapter-meta i {
    width: 14px;
    height: 14px;
}