.about-section {
    padding: 40px 0;
    background: rgba(255, 255, 255, 0.05);
}

.about-section h2 {
    color: var(--wg-accent);
    font-size: 1.8rem;
    margin-bottom: 25px;
    padding-bottom: 10px;
    border-bottom: none;
    display: flex;
    align-items: center;
    gap: 6px;
    position: relative;
}

.about-section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(255, 107, 0, 0.5), transparent);
}

.about-section h2 .section-icon {
    width: 50px;
    height: 50px;
    object-fit: contain;
}

.about-intro {
    display: flex;
    gap: 40px;
    align-items: center;
    margin-bottom: 50px;
    padding: 30px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.intro-content {
    flex: 1;
}

.intro-content p {
    color: var(--wg-light);
    line-height: 1.8;
    margin-bottom: 0;
    font-size: 1rem;
    text-align: justify;
}

.intro-content p:last-child {
    margin-bottom: 0;
    color: var(--wg-gray);
    font-size: 0.9rem;
}

.intro-content .disclaimer-text {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    color: var(--wg-gray);
    font-size: 0.9rem;
}

.intro-content .disclaimer-text::before {
    content: "　　⚠";
    color: #ffaa44;
    font-size: 14px;
    flex-shrink: 0;
    margin-top: 2px;
}

.intro-logo {
    flex-shrink: 0;
    width: 200px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 107, 0, 0.1);
    border-radius: 50%;
    border: 3px solid var(--wg-accent);
}

.intro-logo img {
    width: 140px;
    height: auto;
}

.about-features {
    margin-bottom: 50px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 25px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.feature-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--wg-accent);
    transform: translateY(-3px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.feature-card h3 {
    color: var(--wg-white);
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.feature-card p {
    color: var(--wg-light);
    font-size: 0.9rem;
    line-height: 1.6;
}

.about-stats {
    margin-bottom: 50px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.stat-card {
    background: linear-gradient(135deg, rgba(255, 107, 0, 0.1), rgba(255, 107, 0, 0.05));
    border-radius: 12px;
    padding: 30px 20px;
    text-align: center;
    border: 1px solid rgba(255, 107, 0, 0.3);
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: var(--wg-accent);
    box-shadow: 0 10px 30px rgba(255, 107, 0, 0.2);
}

.stat-card .stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--wg-accent);
    margin-bottom: 10px;
}

.stat-card .stat-label {
    color: var(--wg-light);
    font-size: 0.95rem;
}

.about-changelog {
    margin-bottom: 50px;
}

.changelog-timeline {
    position: relative;
    padding: 100px 0 80px 0;
}

.timeline-spine {
    position: absolute;
    left: 50%;
    top: 0;
    width: 2px;
    height: 100%;
    transform: translateX(-50%);
    background: linear-gradient(to bottom,
            var(--wg-accent) 0%,
            var(--wg-accent) 70%,
            rgba(255, 107, 0, 0.6) 80%,
            rgba(255, 107, 0, 0.3) 90%,
            transparent 100%);
}

.timeline-spine::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-bottom: 12px solid var(--wg-accent);
}

.timeline-item {
    position: relative;
    display: flex;
    align-items: flex-start;
    margin-bottom: 40px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-item.right {
    flex-direction: row;
}

.timeline-item.left {
    flex-direction: row-reverse;
}

.timeline-item:first-child {
    padding-top: 50px;
}

.timeline-item:last-child {
    padding-bottom: 50px;
}

.timeline-node {
    position: absolute;
    left: 50%;
    top: 45px;
    transform: translateX(-50%);
    z-index: 2;
}

.timeline-node .timeline-dot {
    width: 12px;
    height: 12px;
    background: var(--wg-accent);
    border-radius: 50%;
    border: 2px solid var(--wg-darker);
    box-shadow: 0 0 10px rgba(255, 107, 0, 0.5);
}

.timeline-card {
    width: calc(50% - 80px);
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: visible;
    position: relative;
}

.timeline-header {
    padding: 12px 20px;
    background: rgba(255, 107, 0, 0.08);
    border-bottom: 2px solid rgba(255, 107, 0, 0.4);
    border-radius: 12px 12px 0 0;
    position: relative;
}

.timeline-header::before {
    content: '';
    position: absolute;
    bottom: -2px;
    width: 80px;
    height: 2px;
    background: rgba(255, 107, 0, 0.4);
}

.timeline-item.right .timeline-header::before {
    left: -80px;
}

.timeline-item.left .timeline-header::before {
    right: -80px;
}

.timeline-date {
    font-size: 0.9rem;
    color: var(--wg-accent);
    font-weight: 600;
}

.timeline-body {
    padding: 16px 20px;
}

.timeline-title {
    font-size: 1.1rem;
    color: var(--wg-white);
    font-weight: 600;
    margin-bottom: 8px;
}

.timeline-content {
    font-size: 0.9rem;
    color: var(--wg-light);
    line-height: 1.7;
}

.timeline-item.right .timeline-card {
    margin-left: auto;
    margin-right: 0;
}

.timeline-item.left .timeline-card {
    margin-right: auto;
    margin-left: 0;
}

.about-links {
    margin-bottom: 50px;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.link-card {
    display: flex;
    align-items: center;
    gap: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-decoration: none;
    transition: all 0.3s ease;
}

.link-card:hover {
    background: rgba(255, 107, 0, 0.1);
    border-color: var(--wg-accent);
    transform: translateX(5px);
}

.link-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.link-content {
    flex: 1;
}

.link-content h4 {
    color: var(--wg-white);
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.link-content p {
    color: var(--wg-gray);
    font-size: 0.85rem;
}

.link-arrow {
    font-size: 1.5rem;
    color: var(--wg-accent);
    transition: transform 0.3s ease;
}

.link-card:hover .link-arrow {
    transform: translateX(5px);
}

.about-disclaimer {
    background: rgba(231, 76, 60, 0.1);
    border-radius: 12px;
    padding: 25px;
    border: 1px solid rgba(231, 76, 60, 0.3);
}

.about-disclaimer h2 {
    color: #e74c3c;
    border-bottom-color: rgba(231, 76, 60, 0.3);
}

.about-disclaimer p {
    color: var(--wg-light);
    line-height: 1.8;
    font-size: 0.95rem;
}

@media (max-width: 992px) {
    .about-intro {
        flex-direction: column;
        text-align: center;
    }

    .intro-logo {
        margin: 0 auto;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .changelog-timeline {
        padding: 100px 0 80px 25px;
    }

    .timeline-spine {
        left: 0;
        top: 0;
        height: 100%;
        transform: none;
    }

    .timeline-item {
        flex-direction: row !important;
        padding-left: 25px;
    }

    .timeline-item:first-child {
        padding-top: 50px;
    }

    .timeline-item:last-child {
        padding-bottom: 50px;
    }

    .timeline-node {
        left: 0;
        top: 45px;
        transform: translateX(-50%);
    }

    .timeline-card {
        width: 100%;
        margin-left: 0 !important;
        margin-right: 0 !important;
    }

    .timeline-header::before {
        display: none;
    }
}

@media (max-width: 576px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-card .stat-number {
        font-size: 2rem;
    }

    .about-section h2 {
        font-size: 1.5rem;
    }
}