/* Release Notes Styles */
.release-timeline {
    margin-top: 2rem;
}

.release-year {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-color);
}

.release-year:first-child {
    margin-top: 0;
}

.release-item {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 1rem;
    overflow: hidden;
    background: var(--card-bg);
}

.release-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    cursor: pointer;
    transition: background-color 0.15s;
}

.release-header:hover {
    background-color: var(--bg-secondary);
}

.release-date {
    flex-shrink: 0;
    width: 80px;
}

.release-date-day {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
}

.release-date-month {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.release-title-area {
    flex: 1;
}

.release-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.375rem;
}

.release-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.release-tag {
    font-size: 0.6875rem;
    padding: 0.2rem 0.5rem;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: 100px;
    font-weight: 500;
}

.release-tag.ai {
    background-color: rgba(139, 92, 246, 0.15);
    color: #8b5cf6;
}

.release-tag.campaigns {
    background-color: rgba(59, 130, 246, 0.15);
    color: #3b82f6;
}

.release-tag.messaging {
    background-color: rgba(34, 197, 94, 0.15);
    color: #22c55e;
}

.release-tag.system {
    background-color: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
}

.release-tag.integration {
    background-color: rgba(236, 72, 153, 0.15);
    color: #ec4899;
}

.release-toggle {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    color: var(--text-tertiary);
    transition: transform 0.2s;
}

.release-item.expanded .release-toggle {
    transform: rotate(180deg);
}

.release-content {
    display: none;
    padding: 0 1.25rem 1.25rem;
    border-top: 1px solid var(--border-color);
}

.release-item.expanded .release-content {
    display: block;
}

.release-content h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 1.25rem;
    margin-bottom: 0.625rem;
}

.release-content h3:first-child {
    margin-top: 1rem;
}

.release-content ul {
    margin: 0;
    padding-left: 1.25rem;
    color: var(--text-secondary);
}

.release-content li {
    margin-bottom: 0.375rem;
    line-height: 1.5;
}

.release-content p {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.release-content strong {
    color: var(--text-primary);
}

/* Loading indicator */
.loading-indicator {
    text-align: center;
    padding: 2rem;
    color: var(--text-tertiary);
}

.error {
    text-align: center;
    padding: 2rem;
    color: #ef4444;
}