@charset "utf-8";

:root {
    --site-accent: #2563eb;
    --site-accent-soft: rgba(37, 99, 235, 0.08);
    --site-accent-hover: #1d4ed8;
    --site-card-shadow: 0 1px 3px rgba(15, 23, 42, 0.04), 0 4px 16px rgba(15, 23, 42, 0.06);
    --site-card-shadow-hover: 0 4px 24px rgba(37, 99, 235, 0.10), 0 1px 3px rgba(15, 23, 42, 0.04);
    --site-card-border: rgba(15, 23, 42, 0.06);
    --site-gradient-start: #f8faff;
    --site-gradient-mid: #f0f4fb;
    --site-gradient-end: #f7f8fc;
    --site-text-primary: #0f172a;
    --site-text-secondary: #475569;
    --site-text-muted: #94a3b8;
}

/* ============================
   Body & Typography
   ============================ */
.site-body {
    font-family: "Source Sans 3", "Lato", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-weight: 400;
    padding-top: 5.0rem;
    background: linear-gradient(165deg, var(--site-gradient-start) 0%, var(--site-gradient-mid) 42%, var(--site-gradient-end) 100%);
    background-attachment: fixed;
    color: var(--site-text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6 {
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--site-text-primary);
}

/* ============================
   Navbar
   ============================ */
.site-navbar {
    background: linear-gradient(120deg, #0f172a 0%, #1e293b 55%, #1e3a5f 100%) !important;
    border-bottom: none;
    backdrop-filter: saturate(140%) blur(12px);
    box-shadow: 0 1px 8px rgba(0, 0, 0, 0.12);
}

.site-navbar .navbar-brand {
    letter-spacing: 0.03em;
    font-size: 1.15rem;
}

.site-navbar .nav-link {
    transition: color 0.2s ease, opacity 0.2s ease;
    font-weight: 500;
    letter-spacing: 0.01em;
}

.site-navbar .nav-link:hover {
    color: #fff !important;
    opacity: 1;
}

.navbar {
    opacity: 1;
}

/* ============================
   Cards
   ============================ */
.card {
    border-radius: 1rem !important;
    border: 1px solid var(--site-card-border) !important;
    box-shadow: var(--site-card-shadow) !important;
    transition: box-shadow 0.25s ease, transform 0.25s ease;
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--site-card-shadow-hover) !important;
    transform: translateY(-1px);
}

.card.border-0 {
    border: 1px solid var(--site-card-border) !important;
}

.card-img-overlay {
    border-radius: 1rem !important;
}

/* ============================
   Links
   ============================ */
a {
    color: var(--site-accent);
    transition: color 0.15s ease;
}

a:hover {
    color: var(--site-accent-hover);
    text-decoration: none;
}

.text-profile-bio a {
    font-weight: 500;
    border-bottom: 1px solid rgba(37, 99, 235, 0.2);
    text-decoration: none;
}

.text-profile-bio a:hover {
    border-bottom-color: var(--site-accent);
}

/* ============================
   Rounded Elements
   ============================ */
.rounded-xl {
    border-radius: 1rem !important;
    border: 1px solid var(--site-card-border);
}

.rounded-xl-bottom {
    border-bottom-right-radius: 1rem !important;
    border-bottom-left-radius: 1rem !important;
}

.rounded-xl-top {
    border-top-left-radius: 1rem !important;
    border-top-right-radius: 1rem !important;
}

/* ============================
   Profile
   ============================ */
.text-profile-position {
    font-weight: 500;
    color: var(--site-text-secondary);
}

.text-profile-bio {
    font-weight: 400;
    line-height: 1.72;
    color: var(--site-text-primary);
}

.email-text {
    font-family: "Source Code Pro", ui-monospace, monospace;
    font-size: 0.85rem;
    color: var(--site-text-secondary);
}

/* ============================
   Stats Bar (new)
   ============================ */
.stats-bar {
    display: flex;
    justify-content: space-around;
    padding: 1rem 0;
    margin: 0.75rem 0 0.25rem;
    border-top: 1px solid rgba(15, 23, 42, 0.06);
    border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.stats-bar .stat-item {
    text-align: center;
    flex: 1;
}

.stats-bar .stat-number {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--site-accent);
    letter-spacing: -0.03em;
    line-height: 1.2;
    display: block;
}

.stats-bar .stat-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--site-text-muted);
    font-weight: 600;
    display: block;
    margin-top: 2px;
}

/* ============================
   Research Highlights (new)
   ============================ */
.research-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 0.5rem;
}

.research-highlight-item {
    padding: 1rem 1.15rem;
    border-radius: 0.85rem;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.research-highlight-item:hover {
    border-color: rgba(37, 99, 235, 0.15);
    background: var(--site-accent-soft);
}

.research-highlight-item .rh-icon {
    font-size: 1.35rem;
    margin-bottom: 0.5rem;
    display: block;
}

.research-highlight-item .rh-title {
    font-weight: 700;
    font-size: 0.92rem;
    color: var(--site-text-primary);
    margin-bottom: 0.3rem;
    line-height: 1.3;
}

.research-highlight-item .rh-desc {
    font-size: 0.82rem;
    color: var(--site-text-secondary);
    line-height: 1.55;
}

@media (max-width: 767.98px) {
    .research-highlights {
        grid-template-columns: 1fr;
    }
}

/* ============================
   Postdoc Banner (new)
   ============================ */
.postdoc-banner {
    background: linear-gradient(135deg, #eff6ff 0%, #f0f4ff 50%, #faf5ff 100%);
    border: 1px solid rgba(37, 99, 235, 0.12);
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.postdoc-banner .banner-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
}

.postdoc-banner .banner-text {
    font-size: 0.88rem;
    font-weight: 500;
    color: #1e40af;
}

/* ============================
   Sidebar Profile Card Accent
   ============================ */
.row.sticky-top > .col > .card {
    position: relative;
    overflow: hidden;
}

.row.sticky-top > .col > .card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #2563eb 0%, #6366f1 50%, #8b5cf6 100%);
    opacity: 0.95;
}

/* Social icons in sidebar */
.row.sticky-top .card-body .h4 a {
    color: var(--site-text-secondary);
    transition: color 0.2s ease, transform 0.2s ease;
    display: inline-block;
}

.row.sticky-top .card-body .h4 a:hover {
    color: var(--site-accent);
    transform: scale(1.15);
}

/* ============================
   Publication Items
   ============================ */
.inline-badge {
    height: 16px;
    vertical-align: -10%;
    margin-right: 2px;
    line-break: unset;
}

.no-break {
    white-space: nowrap;
}

.cover-image {
    width: 180px;
    max-height: 120px;
}

.abstract-body {
    min-height: 100px;
}

.badge-publication {
    font-size: 100%;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.abstract-links a {
    font-weight: 500;
    padding: 0.1rem 0.15rem;
    border-radius: 0.2rem;
    transition: background 0.15s ease;
}

.abstract-links a:hover {
    background: var(--site-accent-soft);
}

.my-3.p-0.bg-white.shadow-sm.rounded-xl,
.my-0.p-0.bg-white.shadow-sm.rounded-xl {
    box-shadow: var(--site-card-shadow) !important;
    border: 1px solid var(--site-card-border) !important;
}

/* Publication item row hover */
.row.no-gutters.border-bottom {
    transition: background-color 0.2s ease;
}

.row.no-gutters.border-bottom:hover {
    background-color: rgba(37, 99, 235, 0.02);
}

/* ============================
   News Card
   ============================ */
.bg-white.shadow-sm.rounded-xl h6.border-bottom {
    font-weight: 700;
    color: var(--site-text-primary);
}

/* ============================
   Lazy Loading
   ============================ */
img.lazy {
    background-image: url('images/loading.gif');
    background-repeat: no-repeat;
    background-position: 50% 50%;
    background-size: 50px 50px;
    min-height: 80px;
}

div.lazy {
    background-image: url('images/loading.gif');
    background-repeat: no-repeat;
    background-position: 50% 50%;
    background-size: 50px 50px;
    min-height: 80px;
}

/* ============================
   Year Navigation (Publications page)
   ============================ */
#navbar-year .nav-link {
    border-radius: 0.5rem;
    padding: 0.35rem 0.75rem;
    font-weight: 600;
    font-size: 0.88rem;
    transition: all 0.15s ease;
}

#navbar-year .nav-link:hover {
    background: var(--site-accent-soft);
}

#navbar-year .nav-link.active {
    background: var(--site-accent) !important;
    color: #fff !important;
}

/* ============================
   Footer
   ============================ */
.site-footer {
    border-top: 1px solid rgba(15, 23, 42, 0.06);
    margin-top: 3rem;
}

/* ============================
   Responsive tweaks
   ============================ */
@media (max-width: 767.98px) {
    .stats-bar {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    .stats-bar .stat-item {
        flex: 0 0 50%;
        margin-bottom: 0.25rem;
    }
    .stats-bar .stat-number {
        font-size: 1.25rem;
    }
}

/* ============================
   Smooth scroll
   ============================ */
html {
    scroll-behavior: smooth;
}

/* ============================
   Selection highlight
   ============================ */
::selection {
    background: rgba(37, 99, 235, 0.15);
    color: var(--site-text-primary);
}

/* ============================
   Gallery — Hero
   ============================ */
.gallery-hero {
    max-width: 640px;
    margin: 0 auto;
}

.gallery-title {
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: -0.04em;
    background: linear-gradient(135deg, #0f172a 0%, #2563eb 60%, #6366f1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gallery-subtitle {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--site-text-secondary);
    margin-top: 0.5rem;
}

/* ============================
   Gallery — Tabs
   ============================ */
.gallery-tabs {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.gallery-tab {
    padding: 0.5rem 1.25rem;
    border: 1.5px solid rgba(15, 23, 42, 0.10);
    border-radius: 2rem;
    background: #fff;
    color: var(--site-text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    outline: none;
}

.gallery-tab:hover {
    border-color: var(--site-accent);
    color: var(--site-accent);
    background: var(--site-accent-soft);
}

.gallery-tab.active {
    background: var(--site-accent);
    color: #fff;
    border-color: var(--site-accent);
    box-shadow: 0 2px 12px rgba(37, 99, 235, 0.25);
}

/* ============================
   Gallery — Grid (CSS columns masonry)
   ============================ */
.gallery-grid {
    column-count: 3;
    column-gap: 1rem;
}

.gallery-item {
    break-inside: avoid;
    margin-bottom: 1rem;
    animation: galleryFadeIn 0.5s ease forwards;
}

@keyframes galleryFadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ============================
   Gallery — Card
   ============================ */
.gallery-card {
    position: relative;
    border-radius: 0.85rem;
    overflow: hidden;
    cursor: pointer;
    box-shadow: 0 1px 4px rgba(15, 23, 42, 0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.gallery-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(37, 99, 235, 0.12), 0 2px 6px rgba(15, 23, 42, 0.06);
}

.gallery-card img {
    width: 100%;
    display: block;
    transition: transform 0.5s ease;
}

.gallery-card:hover img {
    transform: scale(1.04);
}

/* ============================
   Gallery — Overlay
   ============================ */
.gallery-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 2.5rem 1rem 0.85rem;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.65));
    opacity: 0;
    transition: opacity 0.35s ease;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.gallery-card:hover .gallery-overlay {
    opacity: 1;
}

.gallery-caption {
    color: #fff;
    font-weight: 700;
    font-size: 0.92rem;
    line-height: 1.3;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.gallery-tag {
    display: inline-block;
    margin-top: 0.3rem;
    padding: 0.15rem 0.55rem;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(4px);
    border-radius: 1rem;
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.03em;
}

/* ============================
   Gallery — Lightbox
   ============================ */
.gallery-lightbox {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0, 0, 0, 0.92);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    backdrop-filter: blur(8px);
}

.gallery-lightbox.active {
    opacity: 1;
    pointer-events: auto;
}

.gallery-lightbox img {
    max-width: 90vw;
    max-height: 80vh;
    border-radius: 0.75rem;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
    object-fit: contain;
}

.lightbox-close {
    position: absolute;
    top: 1.5rem;
    right: 2rem;
    font-size: 2rem;
    color: #fff;
    background: none;
    border: none;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.2s;
    z-index: 10;
    line-height: 1;
}

.lightbox-close:hover {
    opacity: 1;
}

.lightbox-caption {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.95rem;
    font-weight: 500;
    margin-top: 1rem;
    text-align: center;
}

/* ============================
   Gallery — Responsive
   ============================ */
@media (max-width: 991.98px) {
    .gallery-grid { column-count: 2; }
    .gallery-title { font-size: 2rem; }
}

@media (max-width: 575.98px) {
    .gallery-grid { column-count: 1; }
    .gallery-title { font-size: 1.6rem; }
    .gallery-tab { padding: 0.4rem 1rem; font-size: 0.82rem; }
}