* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    min-height: 100vh;
    color: #1e293b;
    line-height: 1.7;
    background: linear-gradient(180deg, #ffffff 0%, #f8faff 45%, #ffffff 100%);
}

a {
    color: #4d90fe;
    text-decoration: none;
}

a:hover {
    color: #3367d6;
    text-decoration: underline;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: linear-gradient(135deg, #ffffff 0%, #f8faff 100%);
    border-bottom: 1px solid rgba(77, 144, 254, 0.1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.site-header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.site-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    min-width: 0;
    color: #1f2937;
    text-decoration: none;
}

.site-brand img {
    width: 1.5rem;
    height: 1.5rem;
    flex-shrink: 0;
}

.site-brand span {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    white-space: nowrap;
    background: linear-gradient(135deg, #4d90fe 0%, #3367d6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.site-nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.85rem 1rem;
    color: #6b7280;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    border-radius: 0.75rem;
    transition: all 0.25s ease;
}

.site-nav-link:hover {
    color: #4d90fe;
    background: linear-gradient(135deg, rgba(77, 144, 254, 0.08) 0%, rgba(51, 103, 214, 0.08) 100%);
    box-shadow: 0 4px 12px rgba(77, 144, 254, 0.12);
    transform: translateY(-1px);
    text-decoration: none;
}

.site-nav-link.active {
    color: #4d90fe;
    background: linear-gradient(135deg, rgba(77, 144, 254, 0.12) 0%, rgba(51, 103, 214, 0.12) 100%);
    box-shadow: inset 0 0 0 1px rgba(77, 144, 254, 0.08);
}

.site-nav-hot {
    padding: 0.15rem 0.4rem;
    border-radius: 0.35rem;
    background: linear-gradient(135deg, #ef4444 0%, #f97316 100%);
    color: #fff;
    font-size: 0.62rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    line-height: 1.2;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem 1rem 3rem;
}

.content-narrow {
    max-width: 900px;
}

.container > .header {
    position: relative;
    margin-bottom: 2rem;
    padding: 2rem;
    background: linear-gradient(135deg, #ffffff 0%, #f8faff 100%);
    border: 1px solid rgba(77, 144, 254, 0.15);
    border-radius: 1.5rem;
    box-shadow: 0 8px 24px rgba(77, 144, 254, 0.1), 0 2px 8px rgba(15, 23, 42, 0.04);
    overflow: hidden;
}

.container > .header::before {
    content: '';
    position: absolute;
    inset: 0 0 auto;
    height: 4px;
    background: linear-gradient(90deg, #4d90fe 0%, #3367d6 55%, #2563eb 100%);
}

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.header h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    background: linear-gradient(135deg, #4d90fe 0%, #3367d6 50%, #2563eb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navigation,
.nav-links {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.back-button,
.nav-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.1rem;
    border: 0;
    border-radius: 0.85rem;
    background: linear-gradient(135deg, #4d90fe 0%, #3367d6 100%);
    color: #fff;
    font-size: 0.98rem;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    box-shadow: 0 8px 18px rgba(77, 144, 254, 0.22);
    transition: transform 0.24s ease, box-shadow 0.24s ease, opacity 0.24s ease;
}

.back-button:hover,
.nav-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(77, 144, 254, 0.28);
    color: #fff;
    text-decoration: none;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 0 0 1.5rem;
    color: #64748b;
    font-size: 0.95rem;
}

.article-date,
.article-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 0.9rem;
    border-radius: 999px;
    background: linear-gradient(135deg, rgba(77, 144, 254, 0.1) 0%, rgba(51, 103, 214, 0.08) 100%);
    border: 1px solid rgba(77, 144, 254, 0.12);
}

.article-content,
.faq-content,
.product-intro,
.stats-section,
.team-intro,
.testimonials-section,
.certifications-section,
.contact-info {
    margin-bottom: 2rem;
    padding: 2rem;
    background: linear-gradient(135deg, #ffffff 0%, #f8faff 100%);
    border: 1px solid rgba(77, 144, 254, 0.15);
    border-radius: 1.5rem;
    box-shadow: 0 8px 24px rgba(77, 144, 254, 0.08), 0 2px 8px rgba(15, 23, 42, 0.04);
}

.article-content h2,
.faq-section h2,
.product-intro h2,
.stats-section h2,
.team-intro h2,
.testimonials-section h2,
.certifications-section h2,
.contact-info h2,
.page-section-title {
    margin: 0 0 1.25rem;
    font-size: 1.7rem;
    font-weight: 800;
    color: #1f2937;
}

.article-content h3,
.faq-item h3,
.researcher-details h4,
.contact-item h4 {
    color: #3367d6;
    font-weight: 700;
}

.article-content h3 {
    margin: 1.1rem 0 0.75rem;
    font-size: 1.2rem;
}

.article-content p,
.article-content li,
.article-content ol,
.article-content ul,
.faq-item p,
.product-intro p,
.team-intro p,
.researcher-details p,
.testimonial-content,
.contact-item p,
.contact-item a,
.stat-label,
.certification-text p {
    color: #475569;
}

.article-content p,
.product-intro p,
.team-intro p {
    margin-bottom: 1rem;
    font-size: 1.02rem;
}

.article-content ul,
.article-content ol {
    margin: 1rem 0 1rem 1.5rem;
}

.article-content li {
    margin-bottom: 0.55rem;
}

.article-content code {
    padding: 0.18rem 0.4rem;
    border-radius: 0.35rem;
    background: rgba(77, 144, 254, 0.1);
    color: #2563eb;
    font-family: Consolas, "Courier New", monospace;
}

.article-content pre {
    margin: 1rem 0;
    padding: 1rem;
    overflow-x: auto;
    border-radius: 1rem;
    background: #eff6ff;
    border: 1px solid rgba(77, 144, 254, 0.12);
}

.update-date {
    margin-top: 2rem;
    text-align: right;
    color: #64748b;
    font-size: 0.95rem;
}

.trust-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
    justify-content: center;
}

.trust-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.85rem 1.15rem;
    border-radius: 999px;
    background: linear-gradient(135deg, #ffffff 0%, #f8faff 100%);
    border: 1px solid rgba(77, 144, 254, 0.14);
    box-shadow: 0 6px 18px rgba(77, 144, 254, 0.08);
    color: #475569;
    font-size: 0.95rem;
    font-weight: 600;
}

.trust-badge svg {
    width: 20px;
    height: 20px;
    color: #2563eb;
}

.feature-list {
    list-style: none;
    margin: 1.5rem 0;
}

.feature-list li {
    padding: 0.85rem 0;
    border-bottom: 1px solid rgba(77, 144, 254, 0.12);
    color: #475569;
    font-size: 1rem;
    transition: padding-left 0.24s ease, color 0.24s ease;
}

.feature-list li:last-child {
    border-bottom: 0;
}

.feature-list li:hover {
    padding-left: 0.6rem;
    color: #1f2937;
}

.feature-list strong {
    color: #2563eb;
}

.stats-grid,
.contact-details,
.testimonials-grid,
.certifications-grid,
.researchers-grid {
    display: grid;
    gap: 1.5rem;
}

.stats-grid {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.contact-details {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

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

.certifications-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.researchers-grid {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    margin-top: 1.5rem;
}

.stat-item,
.testimonial-card,
.certification-item,
.researcher-card,
.faq-item {
    background: linear-gradient(135deg, #ffffff 0%, #f8faff 100%);
    border: 1px solid rgba(77, 144, 254, 0.14);
    border-radius: 1.2rem;
    box-shadow: 0 6px 18px rgba(77, 144, 254, 0.07);
}

.stat-item {
    padding: 1.25rem;
    text-align: center;
}

.stat-number {
    margin-bottom: 0.4rem;
    color: #2563eb;
    font-size: 2.3rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.faq-section {
    margin-bottom: 2rem;
}

.faq-section:last-child {
    margin-bottom: 0;
}

.faq-item {
    margin-bottom: 1rem;
    padding: 1.25rem;
}

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

.faq-item h3 {
    margin: 0 0 0.7rem;
    font-size: 1.08rem;
}

.faq-item p {
    margin: 0;
}

.faq-item h3::before,
.faq-item p::before {
    font-weight: 700;
    color: #1f2937;
}

.faq-item table {
    width: 100%;
    margin-top: 0.75rem;
    border-collapse: collapse;
    overflow: hidden;
    border-radius: 1rem;
    background: #fff;
}

.faq-item thead tr {
    background: linear-gradient(135deg, rgba(77, 144, 254, 0.12) 0%, rgba(51, 103, 214, 0.12) 100%) !important;
}

.faq-item th,
.faq-item td {
    padding: 0.8rem !important;
    text-align: left;
    border: 1px solid rgba(77, 144, 254, 0.16) !important;
    color: #475569;
    font-size: 0.94rem;
}

.researcher-card {
    padding: 1.5rem;
    transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
}

.researcher-card:hover {
    transform: translateY(-5px);
    border-color: rgba(77, 144, 254, 0.26);
    box-shadow: 0 16px 32px rgba(77, 144, 254, 0.14);
}

.researcher-header,
.testimonial-header,
.certification-item {
    display: flex;
    align-items: center;
}

.researcher-header {
    margin-bottom: 1.25rem;
}

.researcher-avatar,
.testimonial-avatar,
.certification-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: #fff;
    font-weight: 800;
}

.researcher-avatar {
    width: 80px;
    height: 80px;
    margin-right: 1rem;
    border-radius: 50%;
    background: linear-gradient(135deg, #4d90fe 0%, #3367d6 100%);
    box-shadow: 0 10px 22px rgba(77, 144, 254, 0.22);
    font-size: 2rem;
}

.researcher-info h3,
.testimonial-info h4,
.certification-text h4 {
    color: #1f2937;
}

.researcher-info h3 {
    margin-bottom: 0.35rem;
    font-size: 1.4rem;
}

.researcher-title {
    margin-bottom: 0.3rem;
    color: #2563eb;
    font-size: 0.98rem;
    font-weight: 700;
}

.researcher-education,
.testimonial-info p {
    color: #64748b;
    font-size: 0.92rem;
}

.researcher-details h4 {
    margin: 1.2rem 0 0.8rem;
    font-size: 1.05rem;
}

.researcher-expertise {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    margin-top: 1rem;
}

.expertise-tag {
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    background: rgba(77, 144, 254, 0.1);
    color: #3367d6;
    font-size: 0.84rem;
    font-weight: 700;
}

.testimonial-card {
    padding: 1.5rem;
}

.testimonial-avatar {
    width: 50px;
    height: 50px;
    margin-right: 1rem;
    border-radius: 50%;
    background: linear-gradient(135deg, #4d90fe 0%, #3367d6 100%);
}

.testimonial-rating {
    margin-top: 0.6rem;
    color: #f59e0b;
}

.certification-item {
    gap: 1rem;
    padding: 1rem;
}

.certification-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
}

.certification-icon svg {
    width: 24px;
    height: 24px;
}

.contact-item h4 {
    margin-bottom: 0.45rem;
    font-size: 1.05rem;
}

.contact-item a:hover {
    color: #3367d6;
}

@media (max-width: 900px) {
    .header {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 768px) {
    .site-header-inner {
        flex-direction: column;
        align-items: flex-start;
        padding: 0.9rem 1rem;
    }

    .site-brand span {
        font-size: 1.25rem;
    }

    .site-nav {
        width: 100%;
        justify-content: flex-start;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 0.1rem;
    }

    .site-nav-link {
        white-space: nowrap;
        padding: 0.75rem 0.9rem;
        font-size: 0.95rem;
    }

    .container {
        padding: 1rem 1rem 2rem;
    }

    .container > .header,
    .article-content,
    .faq-content,
    .product-intro,
    .stats-section,
    .team-intro,
    .testimonials-section,
    .certifications-section,
    .contact-info {
        padding: 1.5rem;
        border-radius: 1.25rem;
    }

    .header {
        text-align: left;
    }

    .navigation,
    .nav-links {
        width: 100%;
    }

    .researcher-header,
    .testimonial-header,
    .certification-item {
        align-items: flex-start;
    }
}