.safety-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 4rem;
    padding: 3rem 0;
}

.safety-content {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.97) 0%, rgba(250, 252, 255, 0.97) 100%);
    border-radius: 22px;
    padding: 2.8rem;
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.08);
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    overflow: hidden;
    animation: fadeInUp 0.8s ease-out;
}

.safety-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 80%, rgba(26, 188, 156, 0.03) 0%, transparent 30%),
                radial-gradient(circle at 80% 20%, rgba(52, 152, 219, 0.03) 0%, transparent 30%);
    pointer-events: none;
}

.safety-content h1 {
    font-size: 3.8rem;
    margin-bottom: 2.5rem;
    color: var(--primary);
    font-family: 'Playfair Display', serif;
    text-align: center;
    position: relative;
    padding-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.safety-content h1::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 180px;
    height: 4px;
    background: linear-gradient(to right, var(--primary), var(--accent));
    border-radius: 2px;
}

.safety-content h2 {
    font-size: 2.4rem;
    margin: 4rem 0 2rem;
    color: var(--primary-dark);
    position: relative;
    padding-left: 1.8rem;
    font-family: 'Playfair Display', serif;
    border-bottom: 2px solid rgba(22, 160, 133, 0.2);
    padding-bottom: 0.8rem;
}

.safety-content h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 0 4px rgba(22, 160, 133, 0.2);
}

.safety-nav {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 250, 252, 0.95) 100%);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08);
    height: fit-content;
    position: sticky;
    top: 130px;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    animation: fadeInUp 0.8s ease-out;
}

.safety-nav h3 {
    font-size: 1.6rem;
    margin-bottom: 2rem;
    color: var(--primary);
    padding-bottom: 1.2rem;
    border-bottom: 2px solid var(--accent-light);
    font-family: 'Playfair Display', serif;
    text-align: center;
    position: relative;
}

.safety-nav h3::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--accent);
    border-radius: 2px;
}

.safety-nav ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.safety-nav a {
    color: var(--text);
    text-decoration: none;
    display: flex;
    align-items: center;
    transition: var(--transition);
    padding: 1.2rem 1.5rem;
    border-radius: 12px;
    font-weight: 500;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(22, 160, 133, 0.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.safety-nav a::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent) 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: -1;
}

.safety-nav a::after {
    content: '→';
    color: var(--accent);
    margin-left: auto;
    transition: var(--transition);
    font-weight: 600;
}

.safety-nav a:hover {
    color: white;
    border-color: var(--accent-light);
    transform: translateX(6px) scale(1.02);
    box-shadow: 0 8px 24px rgba(22, 160, 133, 0.2);
}

.safety-nav a:hover::before { opacity: 1; }
.safety-nav a:hover::after { color: white; transform: translateX(5px); }
.safety-nav a.active {
    background: rgba(22, 160, 133, 0.12);
    color: var(--accent);
    border-color: var(--accent-light);
    box-shadow: 0 5px 15px rgba(22, 160, 133, 0.15);
}

.method-card {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.9) 0%, rgba(248, 250, 252, 0.9) 100%);
    border-radius: 20px;
    padding: 3rem;
    margin-bottom: 3.5rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.method-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(to bottom, var(--accent-light), var(--accent-secondary));
}

.method-card:hover {
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.1);
    transform: translateY(-8px);
}

.step-list {
    list-style: none;
    counter-reset: step-counter;
}

.step-item {
    margin-bottom: 2.5rem;
    padding: 1.5rem;
    position: relative;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.7);
    border-radius: 12px;
    border-left: 4px solid var(--accent);
}

.step-item:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.step-item::before {
    content: counter(step-counter);
    counter-increment: step-counter;
    position: absolute;
    top: 1.5rem;
    left: 1.5rem;
    width: 32px;
    height: 32px;
    background: var(--accent);
    color: white;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.step-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--primary);
    padding-left: 3rem;
}

.step-detail {
    color: var(--text-light);
    line-height: 1.7;
    font-size: 1.1rem;
    padding-left: 3rem;
}

.step-detail ul { list-style: none; margin: 0.8rem 0; }
.step-detail li { margin-bottom: 0.5rem; padding-left: 1.2rem; position: relative; }
.step-detail li::before { content: '•'; position: absolute; left: 0; color: var(--accent); font-size: 1.3rem; }

.pros-cons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 1.5rem 0;
    padding: 2rem;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.9) 0%, rgba(248, 250, 252, 0.9) 100%);
    border-radius: 16px;
    border: 1px solid rgba(22, 160, 133, 0.1);
}

.pros { color: #4CAF50; }
.cons { color: #F44336; }

.pros-cons ul { list-style: none; margin-top: 1rem; }
.pros-cons li { margin-bottom: 0.8rem; padding-left: 1.5rem; position: relative; }
.pros-cons li::before { content: '•'; position: absolute; left: 0; font-size: 1.5rem; }

.chemical-formula {
    font-family: 'Courier New', monospace;
    color: var(--primary);
    margin: 1em 0;
    padding: 1em;
    background: rgba(93,168,179,0.1);
    border-radius: 8px;
    display: inline-block;
}

.content-image {
    width: 80%;
    margin: 1.5em auto;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    display: block;
}

.article-content {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 4rem;
    box-shadow: var(--card-shadow);
    max-width: 900px;
    margin: 0 auto;
    line-height: 1.8;
}

.note {
    background: rgba(255, 255, 255, 0.6);
    border-left: 4px solid var(--accent-secondary);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0 12px 12px 0;
}

.author-card {
    display: flex;
    background: linear-gradient(145deg, #f8f9fa, #e9ecef);
    border-radius: 15px;
    padding: 25px;
    margin: 40px 0;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    border-left: 5px solid var(--accent);
    transition: transform 0.3s ease;
}

.author-card:hover { transform: translateY(-5px); }
.author-avatar {
    flex: 0 0 80px; height: 80px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    margin-right: 20px; color: white; font-size: 2rem;
}
.author-info { flex: 1; }
.author-title { color: var(--accent); font-weight: 600; margin-bottom: 10px; }
.author-social {display: flex;flex-wrap: wrap;gap: 10px}
.social-tag {
    background: rgba(52, 152, 219, 0.1); color: var(--primary);
    padding: 5px 12px; border-radius: 20px; font-size: 0.85rem;
    display: flex; align-items: center; gap: 5px;
}

.qa-section {
    background: linear-gradient(145deg, rgba(232, 244, 253, 0.9) 0%, rgba(214, 235, 255, 0.9) 100%);
    border-radius: 20px;
    padding: 3rem;
    margin: 2.5rem 0;
    border-left: 6px solid var(--accent-secondary);
}

.qa-item { margin: 2rem 0; border-bottom: 1px solid rgba(22, 160, 133, 0.1); padding-bottom: 2rem; }
.qa-item:last-child { border: none; padding-bottom: 0; }
.qa-item h4 { color: var(--primary); font-size: 1.4rem; display: flex; align-items: center; gap: 1rem; }

@media (max-width: 768px) {
    .safety-container { 
        display: flex; 
        flex-direction: column; 
        gap: 2rem; 
        padding: 2rem 1rem;
        width: 100%;
        box-sizing: border-box;
    }

    .safety-content { 
        padding: 2rem 1.5rem; 
        border-radius: 16px; 
        margin: 0; 
        width: 100%; 
        box-sizing: border-box;
        overflow-wrap: break-word; 
        word-wrap: break-word; 
        hyphens: auto; 
    }

    .safety-content h1 { 
        font-size: 2.5rem; 
        margin-bottom: 2rem; 
        word-break: break-word; 
        overflow-wrap: break-word; 
    }

    .safety-content h2 { 
        font-size: 2rem; 
        margin: 3rem 0 1.5rem; 
        padding-left: 1.2rem; 
        word-break: break-word; 
    }

    .method-card { padding: 1.5rem; margin-bottom: 2.5rem; border-radius: 16px; width: 100%; box-sizing: border-box; }
    .step-item { margin-bottom: 1.8rem; padding: 1rem; display: flex; flex-direction: column; border-left: 4px solid var(--accent); width: 100%; box-sizing: border-box; }
    .step-item::before { position: relative; top: auto; left: auto; margin-bottom: 0.8rem; align-self: flex-start; }
    .step-title { font-size: 1.2rem; padding-left: 0; margin-bottom: 0.8rem; order: 1; width: 100%; overflow-wrap: break-word; word-wrap: break-word; }
    .step-detail { font-size: 1rem; padding-left: 0; line-height: 1.6; order: 2; width: 100%; overflow-wrap: break-word; word-wrap: break-word; min-width: 0; word-break: break-word; }
    .step-detail ul { margin: 0.5rem 0; }
    .step-detail li { margin-bottom: 0.3rem; padding-left: 1rem; }
    
    .safety-nav { 
        padding: 1.5rem; 
        margin: 0 0 2rem; 
        width: 100%; 
        box-sizing: border-box;
        order: 2; 
    }
    .safety-nav a { padding: 1rem 1.2rem; min-width: 160px; }
    
    .warning-box { padding: 1.2rem; margin: 1.5rem 0; border-radius: 12px; width: 100%; box-sizing: border-box; }
    .warning-box h3 { font-size: 1.3rem; margin-bottom: 1rem; }
    .warning-box ul { margin: 0.8rem 0; }
    .warning-box li { margin-bottom: 0.5rem; padding-left: 1rem; font-size: 0.95rem; line-height: 1.5; }
    .qa-section { padding: 1.5rem; margin: 1.5rem 0; border-radius: 16px; width: 100%; box-sizing: border-box; }
    .qa-item { margin: 1.2rem 0; padding-bottom: 1.2rem; width: 100%; }
    .qa-item h4 { font-size: 1.2rem; gap: 0.5rem; word-break: keep-all; }
    .qa-item p { padding-left: 0; font-size: 0.95rem; line-height: 1.6; overflow-wrap: break-word; word-wrap: break-word; }
    .pros-cons { grid-template-columns: 1fr; gap: 1.5rem; padding: 1.2rem; margin: 1rem 0; border-radius: 12px; width: 100%; box-sizing: border-box; }
    .pros-cons strong { font-size: 1.1rem; }
    .pros-cons ul { margin-top: 0.8rem; }
    .pros-cons li { margin-bottom: 0.5rem; padding-left: 1rem; font-size: 0.95rem; line-height: 1.5; }
    .content-image { width: 100%; max-width: 100%; margin: 1.5em 0; box-sizing: border-box; }
    .chemical-formula { overflow-x: auto; white-space: nowrap; width: 100%; box-sizing: border-box; }
    .note { width: 100%; box-sizing: border-box; overflow-wrap: break-word; }
    .author-card { flex-direction: column; text-align: center; }
    .author-avatar { margin-right: 0; margin-bottom: 15px; }
    .author-social { justify-content: center; }
    .step-gallery { grid-template-columns: 1fr; }
    .comparison { flex-direction: column; gap: 2em; }
    .comparison-item { width: 100%; }
    .qa-section { padding: 2rem; margin: 1.5rem 0; }
    .qa-item h4 { font-size: 1.1rem; gap: 0.5rem; }
    .qa-item p { padding-left: 0; font-size: 0.95rem; line-height: 1.6; }
}
@media (max-width: 480px) {
    .safety-container { padding: 1rem 0.5rem; }
    .safety-content { padding: 1.2rem 1rem; }
    .safety-content h1 { font-size: 2.2rem; padding-bottom: 1rem; line-height: 1.3; }
    .safety-content h1::after { width: 120px; }
    .safety-content h2 { font-size: 1.6rem; padding-left: 1rem; margin: 2.5rem 0 1.2rem; line-height: 1.3; }
    .safety-content h2::before { width: 8px; height: 8px; }
    .method-card { padding: 1.2rem; margin-bottom: 2rem; border-radius: 12px; }
    .step-item { margin-bottom: 1.5rem; padding: 0.8rem; }
    .step-item::before { width: 24px; height: 24px; font-size: 0.9rem; margin-bottom: 0.6rem; }
    .step-title { font-size: 1.1rem; padding-left: 0; margin-bottom: 0.6rem; }
    .step-detail { font-size: 0.95rem; padding-left: 0; line-height: 1.5; }
    .safety-content p, .step-detail, .method-card p, .note p { font-size: 1rem; line-height: 1.6; overflow-wrap: break-word; word-wrap: break-word; hyphens: auto; min-width: 0; }
    .safety-nav { padding: 1.2rem; margin: 0 0 1.5rem; }
    .safety-nav ul { flex-direction: column; }
    .safety-nav a { min-width: auto; justify-content: flex-start; padding: 0.8rem 1rem; }
    .pros-cons { padding: 1.2rem; }
    .qa-section { padding: 1.5rem; }
    .qa-item h4 { font-size: 1.2rem; }
    .qa-item p { padding-left: 0; }
}