/* =============== ABOUT PAGE =============== */
.about-content {
    padding: 2.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    margin-top: 2rem;
    box-shadow: var(--glass-shadow);
}

.intro-section {
    text-align: center;
    margin-bottom: 3.5rem;
}

.intro-section h2 {
    font-size: 2.2rem;
    color: var(--accent-cyan);
    margin-bottom: 1rem;
    font-weight: 700;
}

.intro-section p {
    font-size: 1.1rem;
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
    color: var(--text-muted);
}

.concept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.concept-card {
    background: rgba(255, 255, 255, 0.03);
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    border: 1px solid var(--glass-border);
    transition: var(--transition);
}

.concept-card:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
    border-color: rgba(255, 255, 255, 0.2);
}

.concept-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 0 10px rgba(255, 193, 7, 0.5));
}

.concept-card h3 {
    font-size: 1.5rem;
    color: var(--accent-blue);
    margin-bottom: 1rem;
    font-weight: 600;
}

.concept-card p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-muted);
}

.planet-details-section, .fun-facts-section, .interactive-section {
    text-align: center;
    margin-bottom: 4rem;
}

.planet-details-section h2, .fun-facts-section h2, .interactive-section h2 {
    font-size: 2.2rem;
    color: var(--accent-purple);
    margin-bottom: 2rem;
    font-weight: 700;
}

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

.planet-comparison-card {
    background: rgba(255, 255, 255, 0.03);
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    transition: var(--transition);
    text-align: left;
}

.planet-comparison-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--accent-blue);
}

.detail-item {
    margin-bottom: 0.8rem;
    color: var(--text-main);
}

.age-example {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    font-style: italic;
}

.facts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.fact-item {
    background: rgba(255, 255, 255, 0.03);
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: flex-start;
    gap: 1.2rem;
    text-align: left;
    transition: var(--transition);
}

.fact-item:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
}

.fact-number {
    min-width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-purple) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    color: #fff;
    flex-shrink: 0;
    box-shadow: 0 4px 10px rgba(79, 172, 254, 0.3);
}

.fact-item p {
    color: var(--text-main);
    line-height: 1.5;
    margin: 0;
}

.video-embed-container {
    position: relative;
    width: 100%;
    max-width: 800px;
    margin: 0 auto 1.5rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid var(--glass-border);
    overflow: hidden;
}

.solar-system-video {
    width: 100%;
    display: block;
    border-radius: 20px;
}

.video-caption {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-top: 1rem;
}

@media (max-width: 768px) {
    .about-content {
        padding: 1.5rem;
    }
    
    .intro-section h2, .planet-details-section h2, .fun-facts-section h2, .interactive-section h2 {
        font-size: 1.8rem;
    }
}