:root {
    --bg-color: #f5faff;
    --panel-bg: #ffffff;
    --panel-soft: #eef7ff;
    --text-main: #172033;
    --text-muted: #5c6f82;
    --accent: #1877b9;
    --accent-strong: #0f5486;
    --border: #c9e0f2;
    --shadow: 0 14px 34px rgba(24, 119, 185, 0.09);
    --font: Georgia, "Times New Roman", Times, serif;
    --ui-font: "Segoe UI", Arial, sans-serif;
}

:root[data-theme="dark"] {
    --bg-color: #08131f;
    --panel-bg: #102033;
    --panel-soft: #172a41;
    --text-main: #edf7ff;
    --text-muted: #b7c9da;
    --accent: #8fd3ff;
    --accent-strong: #c1e8ff;
    --border: #29435c;
    --shadow: 0 18px 45px rgba(0, 0, 0, 0.28);
}

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font);
    background: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    line-height: 1.72;
    min-height: 100vh;
}

a {
    color: inherit;
}

.portfolio-container {
    width: min(100%, 1240px);
    margin: 1.5rem auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: 290px minmax(0, 1fr);
    gap: 1.5rem;
}

.sidebar,
.content-area {
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    box-shadow: var(--shadow);
}

.sidebar {
    padding: 1.5rem;
    height: fit-content;
    text-align: center;
    position: sticky;
    top: 1.5rem;
}

.profile-img {
    width: 156px;
    height: 156px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 1rem;
    border: 3px solid var(--border);
}

.sidebar h1 {
    font-size: 1.6rem;
    font-weight: 700;
    margin: 0 0 0.35rem;
}

.title {
    color: var(--accent);
    font-weight: 700;
    font-family: var(--ui-font);
    margin: 0;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.92rem;
    font-family: var(--ui-font);
    margin: 0.4rem 0 0.8rem;
}

.institution {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-family: var(--ui-font);
    margin: 0 0 1.4rem;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    text-align: left;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 1.25rem 0;
    margin-bottom: 1.25rem;
}

.contact-links a {
    color: var(--text-main);
    text-decoration: none;
    font-size: 0.95rem;
    font-family: var(--ui-font);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    transition: color 0.2s ease;
}

.contact-links a:hover {
    color: var(--accent);
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    justify-content: center;
    margin: 0.5rem 0 1.25rem;
}

.tag-cloud span {
    background: var(--panel-soft);
    color: var(--text-main);
    font-size: 0.75rem;
    font-family: var(--ui-font);
    padding: 0.22rem 0.52rem;
    border-radius: 4px;
    border: 1px solid var(--border);
}

.theme-toggle {
    width: 38px;
    height: 38px;
    border: 1px solid var(--border);
    background: var(--panel-soft);
    color: var(--text-main);
    border-radius: 50%;
    padding: 0;
    font-family: var(--ui-font);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
}

.theme-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.content-area {
    padding: 2rem;
    min-width: 0;
}

.tabs-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    border-bottom: 2px solid var(--border);
    margin-bottom: 2rem;
    padding-bottom: 0.6rem;
    overflow-x: auto;
}

.nav-links {
    display: flex;
    gap: 0.35rem;
    overflow-x: auto;
    white-space: nowrap;
}

.nav-link {
    text-decoration: none;
    font-size: 0.98rem;
    font-weight: 600;
    color: var(--text-muted);
    padding: 0.45rem 0.75rem;
    border-radius: 6px;
    font-family: var(--ui-font);
    transition: color 0.2s ease, background 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent);
    background: var(--panel-soft);
}

.nav-link.cv-link {
    border: 1px solid var(--accent);
    color: var(--accent);
}

section {
    margin-bottom: 2.25rem;
}

h2 {
    font-size: clamp(1.65rem, 3vw, 2.3rem);
    line-height: 1.2;
    margin: 0 0 1rem;
    font-weight: 700;
}

h3 {
    margin: 0 0 0.7rem;
    font-size: 1.25rem;
    font-weight: 700;
}

h4 {
    margin: 0 0 0.45rem;
    font-size: 1.05rem;
}

p {
    margin-top: 0;
}

.eyebrow {
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0;
    text-transform: uppercase;
    margin-bottom: 0.55rem;
    font-family: var(--ui-font);
}

.intro-section {
    border-bottom: 1px solid var(--border);
    padding-bottom: 1.5rem;
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.achievement-strip {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.achievement-card {
    background: linear-gradient(180deg, rgba(24, 119, 185, 0.12), rgba(24, 119, 185, 0.04));
    border: 1px solid var(--border);
    border-top: 4px solid var(--accent);
    border-radius: 8px;
    padding: 1.2rem;
}

.achievement-source {
    display: inline-flex;
    align-items: center;
    color: var(--accent-strong);
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.16rem 0.55rem;
    margin-bottom: 0.7rem;
    font-family: var(--ui-font);
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
}

.achievement-card p {
    color: var(--text-muted);
    margin-bottom: 0;
}

.highlight-badge,
.item-card {
    background: var(--panel-soft);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.highlight-badge {
    padding: 1.2rem 1rem;
    text-align: center;
}

.badge-icon {
    font-size: 1.45rem;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.highlight-badge h4 {
    margin: 0 0 0.35rem;
    font-size: 0.98rem;
}

.highlight-badge p {
    margin: 0;
    font-size: 0.86rem;
    color: var(--text-muted);
}

.scrollable-news-container {
    max-height: 220px;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.4rem 1rem;
    background: var(--panel-soft);
}

.scrollable-news-container::-webkit-scrollbar {
    width: 8px;
}

.scrollable-news-container::-webkit-scrollbar-track {
    background: transparent;
}

.scrollable-news-container::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 999px;
}

.news-feed-item {
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.news-feed-item:last-child {
    border-bottom: none;
}

.news-tag {
    flex: 0 0 auto;
    min-width: 72px;
    text-align: center;
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    color: #ffffff;
    background: var(--accent);
    font-family: var(--ui-font);
}

.news-tag.milestone {
    background: #23815c;
}

.news-tag.project {
    background: #7c3aed;
}

.news-tag.event {
    background: #c85a14;
}

.news-date {
    flex: 0 0 86px;
    color: var(--accent-strong);
    font-family: var(--ui-font);
    font-size: 0.82rem;
    font-weight: 800;
}

.news-feed-item p {
    margin: 0;
}

.news-link-pending {
    color: var(--text-muted);
    font-family: var(--ui-font);
    font-size: 0.78rem;
    font-weight: 700;
}

.item-card {
    padding: 1.4rem;
    margin-bottom: 1.25rem;
}

.item-meta {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 700;
    margin-bottom: 0.6rem;
    font-family: var(--ui-font);
}

.authors,
.venue {
    margin: 0.2rem 0;
    font-size: 0.95rem;
}

.venue {
    color: var(--text-muted);
}

.project-note {
    color: var(--text-muted);
    background: var(--panel-bg);
    border-left: 3px solid var(--accent);
    padding: 0.75rem 0.85rem;
    border-radius: 0 6px 6px 0;
    margin-top: 0.85rem;
}

.compact-list {
    padding-left: 1.2rem;
    margin: 0;
}

.compact-list li {
    margin-bottom: 0.45rem;
}

.btn-action {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    text-decoration: none;
    font-size: 0.88rem;
    padding: 0.48rem 0.9rem;
    border: 1px solid var(--accent);
    color: var(--accent);
    border-radius: 6px;
    font-weight: 700;
    margin-top: 0.8rem;
    font-family: var(--ui-font);
    transition: background 0.2s ease, color 0.2s ease;
}

.btn-action:hover {
    background: var(--accent);
    color: #ffffff;
}

.btn-action.disabled {
    border-color: var(--border);
    color: var(--text-muted);
    cursor: default;
}

.btn-action.disabled:hover {
    background: transparent;
    color: var(--text-muted);
}

.btn-action.youtube-btn {
    border-color: #dc3545;
    color: #dc3545;
}

.btn-action.youtube-btn:hover {
    background: #dc3545;
    color: #ffffff;
}

.media-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
    margin-top: 1.4rem;
}

.media-wrapper {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border);
    aspect-ratio: 4 / 3;
    background: var(--panel-soft);
}

.media-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.media-overlay {
    position: absolute;
    inset: auto 0 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.86));
    padding: 2rem 1rem 1rem;
    color: #ffffff;
}

.media-overlay h5 {
    margin: 0 0 0.25rem;
    font-size: 1.05rem;
}

.media-overlay p {
    margin: 0;
    font-size: 0.82rem;
    color: #e5e7eb;
}

.media-wrapper:hover img {
    transform: scale(1.04);
    opacity: 0.82;
}

.placeholder-media {
    display: grid;
    place-items: center;
    background:
        linear-gradient(135deg, rgba(24, 119, 185, 0.11), transparent),
        var(--panel-soft);
}

.placeholder-icon {
    color: var(--accent);
    font-size: 2.4rem;
    opacity: 0.85;
}

.blog-list {
    display: grid;
    gap: 1rem;
}

.blog-card {
    background: var(--panel-soft);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.resource-card {
    display: grid;
    grid-template-columns: auto 1fr;
    column-gap: 0.85rem;
    row-gap: 0.18rem;
    align-items: start;
    background: var(--panel-soft);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    color: var(--text-main);
    text-decoration: none;
    transition: border-color 0.2s ease, transform 0.2s ease;
}

.resource-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.resource-card i {
    color: var(--accent);
    font-size: 1.2rem;
    margin-top: 0.18rem;
}

.resource-card span {
    font-weight: 700;
}

.resource-card small {
    grid-column: 2;
    color: var(--text-muted);
    font-family: var(--ui-font);
    line-height: 1.45;
}

@media (max-width: 900px) {
    .portfolio-container {
        grid-template-columns: 1fr;
        margin: 0;
        padding: 1rem;
    }

    .sidebar {
        position: static;
    }

    .highlights-grid,
    .achievement-strip,
    .media-grid,
    .resource-grid {
        grid-template-columns: 1fr;
    }

    .content-area {
        padding: 1.25rem;
    }
}

@media (max-width: 560px) {
    .portfolio-container {
        padding: 0.75rem;
    }

    .news-feed-item,
    .item-meta {
        flex-direction: column;
        gap: 0.45rem;
    }

    .news-tag {
        min-width: 0;
        width: fit-content;
    }

    .media-wrapper img.cert-img {
    width: 100%;
    height: 100%;
    object-fit: cover; /* Ensures the certificate image scales neatly without distortion */
    display: block;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Text-Based Certificate List Styling */
.cert-text-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0 0 0;
}

.cert-text-list li {
    padding: 0.75rem 0.5rem;
    border-bottom: 1px dashed var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
}

.cert-text-list li:last-child {
    border-bottom: none;
}

.cert-text-list a {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.cert-text-list a:hover {
    color: var(--accent);
    text-decoration: underline;
}

.list-icon {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.cert-vendor {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-left: auto; /* Cleanly pushes the vendor name to the far right side */
}

}