:root {
    --color-bg: #ffffff;
    --color-surface: #f8f9fa;
    --color-surface-hover: #f1f5f9;
    --color-text: #0f172a;
    --color-text-muted: #64748b;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-border: #e2e8f0;

    --font-main: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;

    --container-width: 1100px;

    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;

    --radius-sm: 6px;
    --radius-md: 10px;
}

[data-theme="dark"] {
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-surface-hover: #334155;
    --color-text: #f8fafc;
    --color-text-muted: #94a3b8;
    --color-primary: #3b82f6;
    --color-primary-hover: #60a5fa;
    --color-border: #334155;
}


* {
    box-sizing: border-box;
}


html {
    scroll-behavior: smooth;
}


body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-main);
    line-height: 1.6;
}


a {
    color: inherit;
    text-decoration: none;
}


img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    width: min(100% - 2rem, var(--container-width));
    margin-inline: auto;
}

.site-header {
    border-bottom: 1px solid var(--color-border);
}

.navbar {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-logo {
    font-size: 1.25rem;
    font-weight: 700;
}

.nav-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.theme-toggle-btn {
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    padding: 0.4rem 0.75rem;
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: background 0.2s ease, border-color 0.2s ease;
}

.theme-toggle-btn:hover {
    background: var(--color-surface);
    border-color: var(--color-primary);
}

.nav-links a {
    color: var(--color-text-muted);
    transition: color 0.2s ease;
}

.nav-links a:hover {
    color: var(--color-text);
}

.site-footer {
    margin-top: var(--space-xl);
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
}

.blog-header {
    padding: var(--space-xl) 0 var(--space-lg);
}

.blog-header h1 {
    margin: 0 0 var(--space-md);
    font-size: 2.5rem;
}

.blog-filters {
    display: flex;
    gap: var(--space-sm);
}

.blog-filters a {
    color: var(--color-text-muted);
}

.blog-filters a:hover {
    color: var(--color-primary);
}


.blog-grid,
.education-list,
.experience-list,
.certifications-list,
.skills-list,
.contact-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.blog-card,
.education-item,
.experience-item,
.certification-item,
.skill-item,
.contact-item {
    overflow: hidden;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.blog-card:hover,
.education-item:hover,
.experience-item:hover,
.certification-item:hover,
.skill-item:hover,
.contact-item:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.blog-card-image,
.education-image,
.experience-image,
.certification-image,
.carousel-image,
.experience-carousel-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
}


.blog-card-body {
    padding: var(--space-md);
}


.blog-card-category {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--color-primary);
    text-transform: uppercase;
}


.blog-card-title {
    margin: var(--space-xs) 0;
    font-size: 1.4rem;
}


.blog-card-title a:hover {
    color: var(--color-primary);
}


.blog-card-excerpt {
    margin: var(--space-sm) 0;
    color: var(--color-text-muted);
}


.blog-card-date {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}


@media (max-width: 768px) {
    .blog-grid,
    .education-list,
    .experience-list,
    .certifications-list,
    .skills-list,
    .contact-list {
        grid-template-columns: 1fr;
    }

    .blog-header h1,
    .certifications-header h1,
    .contact-header h1,
    .about-page h1,
    .experience-header h1,
    .education-header h1 {
        font-size: 2.2rem;
    }
}

.blog-detail {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-xl) 0;
}

.blog-detail-header {
    margin-bottom: var(--space-lg);
}

.blog-detail-header h1 {
    margin: var(--space-sm) 0;
    font-size: 3rem;
    line-height: 1.2;
}

.blog-detail-excerpt {
    color: var(--color-text-muted);
    font-size: 1.15rem;
}

.blog-detail-header time {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.blog-detail-image {
    width: 100%;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.blog-detail-content {
    font-size: 1.08rem;
}

.blog-detail-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

.blog-detail-content h2,
.blog-detail-content h3 {
    margin-top: var(--space-lg);
}

.blog-detail-content blockquote {
    margin: var(--space-lg) 0;
    padding-left: var(--space-md);
    border-left: 4px solid var(--color-primary);
    color: var(--color-text-muted);
}

.blog-detail-footer {
    margin-top: var(--space-xl);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.blog-detail-footer a {
    color: var(--color-primary);
}


@media (max-width: 700px) {

    .blog-detail {
        padding: var(--space-lg) 0;
    }

    .blog-detail-header h1 {
        font-size: 2.2rem;
    }
}
.hero {
    min-height: 70vh;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: 700px;
}

.hero-greeting {
    margin: 0 0 var(--space-xs);
    color: var(--color-primary);
    font-weight: 700;
}

.hero-title {
    margin: 0;
    font-size: 4rem;
    line-height: 1.1;
}

.hero-subtitle {
    margin: var(--space-sm) 0;
    font-size: 1.8rem;
    font-weight: 500;
}

.hero-description {
    max-width: 600px;
    color: var(--color-text-muted);
    font-size: 1.1rem;
}

.hero-actions {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.button {
    display: inline-block;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.button-primary {
    background: var(--color-primary);
    color: white;
}

.button-secondary {
    border: 1px solid var(--color-border);
}

.button-secondary:hover {
    background: var(--color-surface);
}

@media (max-width: 700px) {

    .hero-title {
        font-size: 3rem;
    }

    .hero-subtitle {
        font-size: 1.4rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: flex-start;
    }
}
.latest-posts {
    padding: var(--space-xl) 0;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.section-header h2 {
    margin: 0;
    font-size: 2rem;
}

.section-header a {
    color: var(--color-primary);
    font-weight: 600;
}
.about-page {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-xl) 0;
}

.about-page h1 {
    margin: 0 0 var(--space-sm);
    font-size: 3rem;
}

.about-photo {
    width: 180px;
    height: 180px;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    border-radius: 50%;
    margin-bottom: var(--space-lg);
}

.about-age {
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
}

.about-biography {
    font-size: 1.08rem;
}

.about-biography img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

.about-biography h2,
.about-biography h3 {
    margin-top: var(--space-lg);
}
/* --- Universal Site Banner Accordion Styles --- */

.banner-list,
.education-banner-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.site-banner,
.education-banner {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    overflow: hidden;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.site-banner:hover,
.education-banner:hover {
    border-color: var(--color-primary);
}

.site-banner-header,
.education-banner-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    cursor: pointer;
    user-select: none;
}

.site-banner-photo,
.education-banner-photo {
    width: 80px;
    height: 80px;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.site-banner-photo-placeholder,
.education-banner-photo-placeholder {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    flex-shrink: 0;
}

.site-banner-info,
.education-banner-info {
    flex-grow: 1;
}

.site-banner-title-row,
.education-banner-title-row {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.site-banner-title,
.education-banner-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 700;
}

.site-type-badge,
.education-type-badge {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--color-primary);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
}

.site-banner-meta,
.education-banner-meta {
    margin: 0.25rem 0 0;
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.site-banner-arrow,
.education-banner-arrow {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    transition: transform 0.25s ease;
    padding: var(--space-xs);
}

.site-banner[data-expanded="true"] .site-banner-arrow,
.site-banner.expanded .site-banner-arrow,
.education-banner[data-expanded="true"] .education-banner-arrow,
.education-banner.expanded .education-banner-arrow {
    transform: rotate(180deg);
}

.site-banner-details,
.education-banner-details {
    display: none;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
    padding: var(--space-md);
}

.site-banner[data-expanded="true"] .site-banner-details,
.site-banner.expanded .site-banner-details,
.education-banner[data-expanded="true"] .education-banner-details,
.education-banner.expanded .education-banner-details {
    display: block !important;
}

.gallery-title {
    margin: var(--space-md) 0 var(--space-xs);
    font-size: 1.1rem;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.gallery-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}
.experience-carousel {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.experience-carousel-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    display: none;
}

.experience-carousel-image:first-child {
    display: block;
}

.skills-section {
    margin-top: var(--space-xl);
}

.skills-header h2 {
    margin-bottom: var(--space-lg);
    font-size: 2rem;
}

.skills-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-md);
}

.skill-item {
    padding: var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);

    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.skill-info h3 {
    margin: 0 0 0.25rem;
    font-size: 1.1rem;
}

.skill-category {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.skill-level {
    color: var(--color-primary);
    font-weight: 600;
    white-space: nowrap;
}
@media (max-width: 768px) {

    .skills-list {
        grid-template-columns: 1fr;
    }

}
.certifications-page {
    padding: var(--space-xl) 0;
}

.certifications-header {
    margin-bottom: var(--space-lg);
}

.certifications-header h1 {
    margin: 0;
    font-size: 3rem;
}

.certifications-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-lg);
}

.certification-item {
    overflow: hidden;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);
}

.certification-image {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

.certification-content {
    padding: var(--space-md);
}

.certification-type {
    color: var(--color-primary);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
}

.certification-content h2 {
    margin: 0.5rem 0 0.25rem;
    font-size: 1.35rem;
}

.certification-content h3 {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 1rem;
    font-weight: 400;
}

.certification-date {
    margin: var(--space-sm) 0;
    color: var(--color-text-muted);
}

.certification-information {
    margin-top: var(--space-md);
}
@media (max-width: 768px) {

    .certifications-list {
        grid-template-columns: 1fr;
    }

    .certifications-header h1 {
        font-size: 2.2rem;
    }

}
@media (max-width: 900px) {

    .navbar {
        align-items: flex-start;
        flex-direction: column;
        padding: var(--space-sm) 0;
        gap: var(--space-sm);
    }

    .nav-links {
        width: 100%;
        flex-wrap: wrap;
        gap: 0.75rem 1rem;
    }

    .nav-links a {
        font-size: 0.95rem;
    }

}
.nav-links a.active {
    color: var(--color-text);
    font-weight: 600;
}
.contact-page {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-xl) 0;
}

.contact-header {
    margin-bottom: var(--space-lg);
}

.contact-header h1 {
    margin: 0 0 var(--space-sm);
    font-size: 3rem;
}

.contact-header p {
    color: var(--color-text-muted);
}

.contact-list {
    display: grid;
    gap: var(--space-md);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition:
        border-color 0.2s ease,
        transform 0.2s ease;
}

.contact-item:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.contact-icon {
    width: 48px;
    height: 48px;
    flex-shrink: 0;

    display: flex;
    align-items: center;
    justify-content: center;

    border-radius: 50%;
    background: var(--color-surface);

    font-size: 1.4rem;
}

.contact-content h2 {
    margin: 0;
    font-size: 1.1rem;
}

.contact-content p {
    margin: 0.25rem 0 0;
    color: var(--color-text-muted);
    word-break: break-word;
}

/* CKEditor 5 content highlights */
.blog-detail-content .marker-yellow {
    background-color: hsl(60, 100%, 75%);
}

.blog-detail-content .marker-green {
    background-color: hsl(120, 100%, 85%);
}

.blog-detail-content .marker-red {
    background-color: hsl(0, 100%, 85%);
}

.blog-detail-content .marker-blue {
    background-color: hsl(210, 100%, 85%);
}

/* Compatibility with CKEditor 5's default highlight classes. */
.blog-detail-content .marker-pink {
    background-color: #fc7999;
}

.blog-detail-content .pen-red {
    color: #e91313;
    background-color: transparent;
}

.blog-detail-content .pen-green {
    color: #118800;
    background-color: transparent;
}