/* ============================================================
   Site-wide modern overrides, layered on top of Bootstrap 5.
   Public site only — admin tool has its own admin/style.css.
   ============================================================ */

:root {
    --site-bg:           #fafafa;
    --site-surface:      #ffffff;
    --site-border:       #e5e7eb;
    --site-border-soft:  #f1f5f9;
    --site-text:         #1a202c;
    --site-text-muted:   #4b5563;
    --site-text-soft:    #6b7280;
    --site-text-faint:   #9ca3af;
    --site-accent:       #4f46e5;
    --site-accent-hover: #4338ca;
    --site-accent-soft:  #eef2ff;
    --site-accent-ring:  rgba(79, 70, 229, 0.18);
}

/* ============================================================
   Base typography
   ============================================================ */
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--site-bg);
    color: var(--site-text);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
p { color: var(--site-text); }
h1, h2, h3, h4, h5, h6 { letter-spacing: -0.01em; color: var(--site-text); }
a {
    color: var(--site-accent);
    text-decoration: none;
    transition: color 140ms ease;
}
a:hover {
    color: var(--site-accent-hover);
    text-decoration: underline;
    text-underline-offset: 2px;
    text-decoration-thickness: 1px;
}
/* Links inside the intro tagline/description/info cards: color alone indicates
   the link. No underlines, no borders — visual noise dominates otherwise when
   there are many in-line references on one paragraph. Hover gives a subtle
   underline so the affordance is still discoverable. */
.intro-tagline a, .intro-description a, .info-card a {
    color: var(--site-accent);
    text-decoration: none;
    border-bottom: 0;
}
.intro-tagline a:hover, .intro-description a:hover, .info-card a:hover {
    color: var(--site-accent-hover);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

/* ============================================================
   Navbar polish
   ============================================================ */
.navbar.bg-dark {
    background: #0f172a !important;
    padding-top: 0.6rem;
    padding-bottom: 0.6rem;
}
.navbar-brand {
    font-weight: 700;
    letter-spacing: -0.01em;
    display: inline-flex !important;
    align-items: center;
    gap: 10px;
}
.navbar-brand::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    background: var(--site-accent);
    border-radius: 50%;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.18);
}
.navbar-dark .navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.7);
    padding: 0.5rem 1rem;
    font-size: 0.92rem;
    font-weight: 500;
    border-radius: 6px;
    transition: color 140ms, background 140ms;
}
.navbar-dark .navbar-nav .nav-link:hover { color: #fff; background: rgba(255, 255, 255, 0.06); }
.navbar-dark .navbar-nav .nav-link.active { color: #fff; background: rgba(255, 255, 255, 0.1); }

/* ============================================================
   Hero section (main.php)
   ============================================================ */
.intro { padding: 64px 0 40px; }

.intro-name {
    font-size: 3rem;
    line-height: 1.1;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin: 0 0 12px;
}
.intro-tagline {
    font-size: 1.2rem;
    color: var(--site-text-muted);
    line-height: 1.5;
    margin: 0 0 20px;
    font-weight: 400;
}
.intro-description {
    font-size: 1.02rem;
    color: var(--site-text-muted);
    line-height: 1.75;
    margin: 0 0 8px;
    max-width: 640px;
}
.intro-photo {
    width: 100%;
    max-width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    object-position: center top;
    border-radius: 14px;
    box-shadow: 0 4px 24px rgba(15, 23, 42, 0.10), 0 1px 3px rgba(15, 23, 42, 0.06);
    display: block;
}
/* Right-column sidebar holding photo + socials + email + CTAs.
   Inherits the full col-lg-4 width so visible content reaches the
   container's right edge, matching the cards row below. */
.intro-sidebar {
    margin-top: 20px;
}
.intro-sidebar .social-pills {
    margin: 0 0 16px;
}
.intro-email-line {
    font-size: 0.92rem;
    color: var(--site-text-muted);
    margin: 0 0 16px;
}
.intro-email-line strong {
    color: var(--site-text);
    margin-right: 4px;
    font-weight: 600;
}
/* Stacked CTAs in the intro sidebar */
.intro-cta-stack {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Teaching callout — sits below the CTA stack, fills the bottom-right gap */
.teaching-callout {
    display: block;
    margin-top: 16px;
    padding: 14px 18px;
    background: var(--site-surface);
    border: 1px solid var(--site-border);
    border-left: 3px solid var(--site-accent);
    border-radius: 8px;
    text-decoration: none !important;
    color: var(--site-text);
    transition: all 180ms cubic-bezier(0.4, 0, 0.2, 1);
}
.teaching-callout:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(15, 23, 42, 0.06);
    color: var(--site-text);
    text-decoration: none !important;
    border-left-color: var(--site-accent-hover);
}
.teaching-callout-eyebrow {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--site-accent);
    font-weight: 600;
    margin-bottom: 4px;
}
.teaching-callout-title {
    font-size: 0.97rem;
    font-weight: 600;
    color: var(--site-text);
    line-height: 1.3;
    margin-bottom: 2px;
}
.teaching-callout-meta {
    font-size: 0.85rem;
    color: var(--site-text-muted);
}
.btn-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 11px 22px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 10px;
    transition: all 160ms cubic-bezier(0.4, 0, 0.2, 1);
}
.btn-cta.btn-primary {
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.25);
}
.btn-cta.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 22px rgba(79, 70, 229, 0.32);
}
.btn-cta.btn-outline-primary:hover {
    transform: translateY(-1px);
}

/* Override BS5 primary button to use site indigo accent */
.btn-primary {
    background-color: var(--site-accent);
    border-color: var(--site-accent);
}
.btn-primary:hover, .btn-primary:focus, .btn-primary:active {
    background-color: var(--site-accent-hover) !important;
    border-color: var(--site-accent-hover) !important;
}
.btn-outline-primary {
    color: var(--site-accent);
    border-color: var(--site-accent);
    background-color: transparent;
}
.btn-outline-primary:hover, .btn-outline-primary:focus, .btn-outline-primary:active {
    color: #fff !important;
    background-color: var(--site-accent) !important;
    border-color: var(--site-accent) !important;
}

/* ============================================================
   Social pill buttons
   ============================================================ */
.social-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 24px 0 28px;
}
.social-pills a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: var(--site-surface);
    border: 1px solid var(--site-border);
    color: var(--site-text);
    font-size: 1.2rem;
    text-decoration: none;
    transition: all 160ms cubic-bezier(0.4, 0, 0.2, 1);
}
.social-pills a:hover {
    background: var(--site-accent);
    border-color: var(--site-accent);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.25);
    text-decoration: none;
}

/* ============================================================
   Latest-preprint card (auto-pulled from arXiv every 6h, replaces
   the former news carousel in the intro's left column)
   ============================================================ */
.latest-preprint-card {
    display: block;
    margin-top: 28px;
    padding: 24px 28px;
    border-radius: 12px;
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 50%, #818cf8 100%);
    box-shadow: 0 8px 24px rgba(79, 70, 229, 0.18);
    color: #fff !important;
    text-decoration: none !important;
    transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
}
.latest-preprint-card:hover {
    color: #fff !important;
    text-decoration: none !important;
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(79, 70, 229, 0.28);
}
.latest-preprint-label {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.85;
    margin-bottom: 10px;
}
.latest-preprint-title {
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 8px;
}
.latest-preprint-meta {
    font-size: 0.88rem;
    opacity: 0.92;
    margin-bottom: 14px;
    line-height: 1.5;
}
.latest-preprint-cta {
    font-size: 0.9rem;
    font-weight: 600;
    opacity: 0.95;
}
.latest-preprint-card:hover .latest-preprint-cta { opacity: 1; }

/* ============================================================
   News carousel (kept for legacy/future — no longer rendered on
   the homepage; the admin news tool still maintains the data)
   ============================================================ */
.news-carousel {
    position: relative;
    width: 100%;
    margin-top: 28px;
    border-radius: 12px;
    overflow: hidden;
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 50%, #818cf8 100%);
    box-shadow: 0 8px 24px rgba(79, 70, 229, 0.18);
}
.news-carousel .carousel-inner { width: 100%; }
.news-carousel .carousel-item {
    min-height: 140px;
    display: flex;
    align-items: center;
}
.news-carousel .carousel-item:not(.active):not(.carousel-item-start):not(.carousel-item-end):not(.carousel-item-next):not(.carousel-item-prev) {
    display: none;
}
.news-carousel .carousel-item img { display: none; }
.news-carousel .carousel-caption {
    position: static;
    width: 100%;
    padding: 22px 56px;
    text-align: left;
    color: #fff;
    text-shadow: none;
}
.news-carousel .carousel-caption h1,
.news-carousel .carousel-caption h2,
.news-carousel .carousel-caption h3,
.news-carousel .carousel-caption h4 {
    color: #fff;
    margin: 0 0 6px;
    font-weight: 600;
    font-size: 1.15rem;
}
.news-carousel .carousel-caption p {
    color: rgba(255, 255, 255, 0.95);
    margin: 0 0 4px;
    line-height: 1.5;
    font-size: 0.92rem;
}
.news-carousel .carousel-caption p:last-child { margin-bottom: 0; }
.news-carousel .carousel-caption a {
    color: #fff;
    text-decoration: underline;
    text-underline-offset: 2px;
}
.news-carousel .carousel-caption a:hover { opacity: 0.85; }
.news-carousel .carousel-control-prev,
.news-carousel .carousel-control-next {
    width: 36px;
    opacity: 0.85;
}
.news-carousel .carousel-control-prev { left: 4px; }
.news-carousel .carousel-control-next { right: 4px; }
.news-carousel .carousel-control-prev:hover,
.news-carousel .carousel-control-next:hover { opacity: 1; }
.news-carousel .carousel-control-prev-icon,
.news-carousel .carousel-control-next-icon {
    width: 1.2rem;
    height: 1.2rem;
}
.news-carousel .carousel-indicators { margin-bottom: 6px; }
.news-carousel .carousel-indicators button {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    border: 0;
    margin: 0 3px;
    transition: background 140ms, transform 140ms;
}
.news-carousel .carousel-indicators button.active {
    background: #fff;
    transform: scale(1.3);
}

/* ============================================================
   Info cards (About / Background / Other interests)
   ============================================================ */
.info-cards-section { margin-bottom: 64px; }
.section-eyebrow {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--site-accent);
    margin: 0 0 12px;
    font-weight: 600;
}
.info-card {
    background: var(--site-surface);
    border: 1px solid var(--site-border);
    border-radius: 12px;
    padding: 28px;
    height: 100%;
    transition: box-shadow 160ms ease, transform 160ms ease;
}
.info-card:hover {
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
    transform: translateY(-2px);
}
.info-card h2.section-eyebrow { margin: 0 0 14px; font-size: 0.78rem; }
.info-card p {
    color: var(--site-text-muted);
    line-height: 1.7;
    margin: 0;
    font-size: 0.97rem;
}
.info-card p + p { margin-top: 12px; }
.info-card ul.research-themes {
    list-style: none;
    padding: 0;
    margin: 12px 0 8px;
}
.info-card ul.research-themes li {
    padding: 8px 0 8px 18px;
    position: relative;
    color: var(--site-text-muted);
    line-height: 1.6;
    font-size: 0.95rem;
    border-bottom: 1px solid var(--site-border-soft);
}
.info-card ul.research-themes li:last-child { border-bottom: 0; }
.info-card ul.research-themes li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 16px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--site-accent);
}
.info-card ul.research-themes li b {
    color: var(--site-text);
    display: block;
    margin-bottom: 2px;
}

/* ============================================================
   Group callout (text-only link to the aQa group page)
   ============================================================ */
.group-callout-section {
    margin: 16px auto 60px;
}
.group-callout {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px 24px;
    background: var(--site-surface);
    border: 1px solid var(--site-border);
    border-left: 4px solid var(--site-accent);
    border-radius: 10px;
    text-decoration: none !important;
    color: var(--site-text);
    transition: all 180ms cubic-bezier(0.4, 0, 0.2, 1);
}
.group-callout:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
    color: var(--site-text);
    text-decoration: none !important;
    border-left-color: var(--site-accent-hover);
}
.group-callout-icon {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--site-accent-soft);
    color: var(--site-accent);
    border-radius: 10px;
    font-size: 1.2rem;
}
.group-callout-body {
    flex: 1;
    min-width: 0;
}
.group-callout-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--site-text);
    margin-bottom: 2px;
}
.group-callout-text {
    font-size: 0.92rem;
    color: var(--site-text-muted);
    line-height: 1.5;
}
.group-callout-cta {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--site-accent);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}
.group-callout:hover .group-callout-cta {
    color: var(--site-accent-hover);
}

@media (max-width: 640px) {
    .group-callout {
        flex-direction: column;
        align-items: flex-start;
        gap: 14px;
    }
    .group-callout-cta {
        align-self: flex-end;
    }
}

/* ============================================================
   Group photo banner (legacy, currently unused — kept in case you
   want to switch back. Markup removed from main.php; styles inert.)
   ============================================================ */
.group-photo-section {
    margin: 24px auto 60px;
    text-align: center;
}
.group-photo-link {
    display: block;
    position: relative;
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 4px 24px rgba(15, 23, 42, 0.08), 0 1px 3px rgba(15, 23, 42, 0.06);
    transition: all 220ms cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none !important;
}
.group-photo-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 36px rgba(15, 23, 42, 0.14);
    text-decoration: none !important;
}
.group-photo-img {
    width: 100%;
    height: auto;
    display: block;
}
.group-photo-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(15, 23, 42, 0.6) 0%, rgba(15, 23, 42, 0) 40%);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    transition: opacity 220ms ease;
}
.group-photo-link:hover .group-photo-overlay {
    opacity: 1;
}
.group-photo-overlay-text {
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    background: rgba(79, 70, 229, 0.92);
    padding: 10px 20px;
    border-radius: 8px;
    backdrop-filter: blur(4px);
}
.group-photo-caption {
    margin: 16px 0 0;
    color: var(--site-text-muted);
    font-size: 0.92rem;
    text-align: center;
}

/* ============================================================
   Generic .card tweaks (BS5 default panels-replaced-with-cards)
   ============================================================ */
.card {
    border: 1px solid var(--site-border);
    border-radius: 10px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
}
.card-header {
    background: transparent;
    border-bottom: 1px solid var(--site-border);
    font-weight: 600;
    padding: 14px 18px;
}
.card-body { padding: 18px; }
.card-footer {
    background: var(--site-border-soft);
    border-top: 1px solid var(--site-border);
}

/* ============================================================
   Footer
   ============================================================ */
.navbar-default.navbar-static-bottom,
.navbar.navbar-default {
    background: var(--site-surface) !important;
    border-top: 1px solid var(--site-border);
    border-bottom: 0;
    padding: 22px 0;
    margin-top: 60px;
    font-size: 0.85rem;
    color: var(--site-text-soft) !important;
}
.navbar-default .navbar-text {
    color: var(--site-text-soft) !important;
    padding: 0;
}

/* ============================================================
   Generic .page-header (legacy BS3 separator)
   ============================================================ */
.page-header {
    border-bottom: 1px solid var(--site-border);
    margin: 40px 0 24px;
    padding: 0;
    height: 1px;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 991.98px) {
    .intro { padding: 40px 0 28px; }
    .intro-name { font-size: 2.2rem; }
    .intro-tagline { font-size: 1.05rem; }
    .intro-photo { max-width: 260px; margin: 0 auto 16px; }
    .intro-sidebar { margin: 0 auto; text-align: center; }
    .intro-sidebar .social-pills { justify-content: center; }
    .news-carousel .carousel-caption { padding: 28px 40px; }
}

@media (max-width: 575.98px) {
    .intro-name { font-size: 1.85rem; }
    .social-pills a { width: 40px; height: 40px; font-size: 1.05rem; }
    .info-card { padding: 22px; }
}