/* ==========================================================================
   Nelson D. Medina - Personal Website
   Aesthetic: Dark, immersive, scientific
   Palette: Paul Tol muted (colorblind-accessible)
   Fonts: Calistoga (headings) + Work Sans (body)
   ========================================================================== */

:root {
    --primary: #332288;
    --secondary: #6699CC;
    --accent-rose: #CC6677;
    --accent-teal: #44AA99;
    --accent-sand: #DDCC77;
    --accent-wine: #882255;
    --bg-dark: #0d1117;
    --bg-section: #111820;
    --bg-card: rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.08);
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    --text-primary: #f5f7fa;
    --text-secondary: #dce1e8;
    --text-muted: #a0a8b4;
    --font-heading: 'Calistoga', serif;
    --font-body: 'Work Sans', sans-serif;
    --max-width: 1400px;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    scroll-behavior: smooth;
    background: var(--bg-dark);
}

body {
    font-family: var(--font-body);
    font-weight: 450;
    color: var(--text-primary);
    background: transparent;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a { color: var(--accent-teal); text-decoration: none; transition: color 0.3s; }
a:hover { color: var(--accent-sand); }

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--accent-teal);
    color: var(--bg-dark);
    padding: 0.5rem 1rem;
    z-index: 1000;
    transition: top 0.3s;
}
.skip-link:focus { top: 0; }

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
    position: relative;
    min-height: 60vh;
    display: flex;
    align-items: center;
    /* no overflow:hidden — let the bg bleed past the hero into the divider */
}

.hero-bg {
    position: fixed;
    top: -20vh;
    left: 0;
    right: 0;
    bottom: -20vh;
    z-index: -1;
}

.hero-bg-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.55);
    transition: filter 0.8s ease;
}

.hero-bg-seg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.8s ease;
    pointer-events: none;
}

.hero-bg-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(13, 17, 23, 0.2) 0%,
        rgba(13, 17, 23, 0.1) 10%,
        rgba(13, 17, 23, 0.45) 35%,
        rgba(13, 17, 23, 0.8) 60%,
        rgba(13, 17, 23, 0.95) 80%
    );
    transition: opacity 0.8s ease;
}

.hero-content {
    position: relative;
    z-index: 1;
    padding: 0 2rem 0 12rem;
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
}

.hero-intro {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 4rem;
    align-items: center;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-photo-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-shrink: 0;
}

.hero-photo {
    width: 320px;
    height: 320px;
    object-fit: cover;
    border-radius: 50%;
    border: 3px solid rgba(255, 255, 255, 0.15);
    transition: border-color 0.4s ease;
}

/* Icons sit just below the photo, curving to match the circle's edge */
.hero-icons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 0.5rem;
}

.hero-icons a {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all 0.4s ease;
}

/* Curve upward at edges, hugging the underside of the circle */
.hero-icons a:nth-child(1) { transform: translateY(-5px); }
.hero-icons a:nth-child(2) { transform: translateY(-1px); }
.hero-icons a:nth-child(3) { transform: translateY(-5px); }

.hero-icons svg {
    width: 20px;
    height: 20px;
}

/* Hover the whole photo area: border glows, icons grow + brighten */
.hero-photo-wrap:hover .hero-photo {
    border-color: var(--accent-rose);
}

.hero-photo-wrap:hover .hero-icons a {
    color: var(--text-primary);
}
.hero-photo-wrap:hover .hero-icons a:nth-child(1) { transform: translateY(-5px) scale(1.35); }
.hero-photo-wrap:hover .hero-icons a:nth-child(2) { transform: translateY(-1px) scale(1.35); }
.hero-photo-wrap:hover .hero-icons a:nth-child(3) { transform: translateY(-5px) scale(1.35); }

.hero-photo-wrap:hover .hero-icons a:hover {
    color: var(--accent-sand);
}

.hero-nav {
    display: flex;
    justify-content: center;
    gap: 1.75rem;
    margin-top: 1.5rem;
}

.hero-nav a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: color 0.3s;
}

.hero-nav a:hover {
    color: var(--accent-rose);
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.hero-subtitle {
    font-family: var(--font-heading);
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    color: var(--accent-rose);
    margin-bottom: 1rem;
}

.hero-about {
    font-size: clamp(0.95rem, 1.5vw, 1.05rem);
    color: var(--text-secondary);
    max-width: 600px;
    line-height: 1.8;
    font-weight: 300;
    margin-bottom: 0.75rem;
}

.hero-about strong {
    color: var(--text-primary);
    font-weight: 600;
}

.hero-about-accent {
    color: var(--accent-sand);
    font-style: italic;
    opacity: 0.85;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}


/* ==========================================================================
   Ephys + EM Banner Divider
   ========================================================================== */

.ephys-divider {
    position: relative;
    width: 100%;
    height: 200px;
    margin-top: 6rem;
    overflow: hidden;
    /* transparent so the hero EM background bleeds through */
    background: transparent;
}

#ephys-canvas {
    position: absolute;
    inset: 0;
    transition: opacity 0.8s ease, filter 0.8s ease;
    width: 100%;
    height: 100%;
    z-index: 1;
    display: block;
}

.divider-finch {
    position: absolute;
    left: 0;
    bottom: 15%;
    height: 90%;
    width: auto;
    z-index: 2;
    pointer-events: none;
    filter: drop-shadow(0 0 15px rgba(0, 0, 0, 0.6));
}

/* ==========================================================================
   Tab-specific backdrop states
   ========================================================================== */

/* Birdsong (default): ephys prominent, EM subdued */

/* Connectomics: EM brighter, ephys desaturated */
body.tab-connectomics .hero-bg-img {
    filter: brightness(0.8);
}
body.tab-connectomics .hero-bg-overlay {
    opacity: 0.5;
}
body.tab-connectomics #ephys-canvas {
    opacity: 0.4;
    filter: grayscale(1) brightness(0.7);
}

/* Song Memory: both EM and ephys bright */
body.tab-songmemory .hero-bg-img {
    filter: brightness(0.8);
}
body.tab-songmemory .hero-bg-overlay {
    opacity: 0.5;
}
body.tab-songmemory #ephys-canvas {
    opacity: 1;
}
body.tab-songmemory .hero-bg-seg {
    opacity: 1;
}
.hero-bg-seg.seg-hidden {
    opacity: 0 !important;
}

/* Shared text legibility for brighter-backdrop tabs */
body.tab-connectomics .hero-about,
body.tab-connectomics .hero-about-accent,
body.tab-connectomics .panel-text p,
body.tab-connectomics .pub-title,
body.tab-connectomics .pub-authors,
body.tab-connectomics .pub-journal,
body.tab-connectomics .contact-address,
body.tab-connectomics .contact-lab,
body.tab-songmemory .hero-about,
body.tab-songmemory .hero-about-accent,
body.tab-songmemory .panel-text p,
body.tab-songmemory .pub-title,
body.tab-songmemory .pub-authors,
body.tab-songmemory .pub-journal,
body.tab-songmemory .contact-address,
body.tab-songmemory .contact-lab {
    color: var(--text-primary);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.9), 0 0 12px rgba(0, 0, 0, 0.5);
}
body.tab-connectomics .section-title,
body.tab-songmemory .section-title {
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.9), 0 0 12px rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   Sections (shared)
   ========================================================================== */

.section {
    padding: 6rem 0;
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    color: var(--text-primary);
    margin-bottom: 3rem;
}

/* ==========================================================================
   Research: Button + Panel layout
   ========================================================================== */

.research {
    background: transparent;
    padding-top: 0;
}

.research-tools-grid {
    display: grid;
    grid-template-columns: 1fr 520px;
    gap: 3rem;
    align-items: start;
}

.research-area .section-title,
.tools-area .section-title {
    margin-bottom: 1.5rem;
}

.research-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 1.5rem;
    min-height: 400px;
}

/* Left: stacked buttons */
.research-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.research-btn {
    position: relative;
    display: flex;
    align-items: stretch;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    padding: 0;
    cursor: pointer;
    text-align: left;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    overflow: hidden;
    font-family: var(--font-body);
}

.research-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
}

.research-btn.active {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-accent {
    width: 4px;
    flex-shrink: 0;
    border-radius: 12px 0 0 12px;
    transition: width 0.3s;
}

.research-btn.active .btn-accent {
    width: 5px;
}

.btn-content {
    padding: 1rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.btn-label {
    font-family: var(--font-heading);
    font-size: 1rem;
    color: var(--text-primary);
    line-height: 1.3;
}

.btn-sub {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.research-btn.active .btn-label {
    color: #fff;
}

/* Right: visual display panels — no border/frame */
.research-display {
    position: relative;
}

.research-panel {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.research-panel.active {
    position: relative;
    opacity: 1;
    pointer-events: all;
}

.panel-text {
    padding: 0 0 1rem;
}

/* Image gallery with arrows */
.panel-gallery {
    position: relative;
}

.gallery-viewport {
    overflow: visible;
    border-radius: 8px;
}

.gallery-track {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    transition: grid-template-columns 0.5s ease;
}

.gallery-track[data-count="1"] {
    grid-template-columns: 1fr;
}

.gallery-track[data-count="2"] {
    grid-template-columns: 1fr 1fr;
}

.gallery-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    grid-column: span 1;
    border-radius: 8px;
    display: block;
    cursor: pointer;
    transition: opacity 0.5s ease, height 0.5s ease, transform 0.5s ease;
    align-self: center;
}

.gallery-track.has-expanded {
    grid-template-columns: 1fr 3fr 1fr;
    align-items: center;
}

.gallery-track.has-expanded .gallery-img {
    height: 100px;
    opacity: 0.45;
    transform: scale(0.9);
}

.gallery-track.has-expanded .gallery-img:hover {
    opacity: 0.7;
}

.gallery-track.has-expanded .gallery-img.expanded {
    height: 320px;
    object-fit: cover;
    opacity: 1;
    transform: scale(1);
    border-radius: 6px;
}

.gallery-track-wide {
    grid-template-columns: 1fr;
}

.gallery-track-wide .gallery-img {
    height: auto;
    object-fit: contain;
}

/* Let the wide image gallery span the full research-layout width, centered */
.panel-gallery-wide {
    margin-left: calc(-260px - 1.5rem);
    width: calc(100% + 260px + 1.5rem);
    display: flex;
    justify-content: center;
}

.gallery-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 0.75rem;
}

.gallery-arrow {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 1px solid var(--border-subtle);
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.gallery-arrow:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.gallery-dots {
    display: flex;
    gap: 6px;
}

.gallery-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transition: background 0.3s;
}

.gallery-dot.active {
    background: rgba(255, 255, 255, 0.7);
}

.panel-text p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 300;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.panel-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.card-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent-teal);
    background: rgba(68, 170, 153, 0.1);
    border: 1px solid rgba(68, 170, 153, 0.2);
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
}


/* ==========================================================================
   Publications
   ========================================================================== */

.publications { background: transparent; padding-top: 0; }

.pub-list {
    list-style: none;
    max-width: 800px;
}

.pub-item {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 1.5rem;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-subtle);
    transition: background 0.3s;
}

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

.pub-year {
    font-family: var(--font-heading);
    font-size: 1rem;
    color: var(--accent-sand);
    padding-top: 0.2rem;
}

.pub-title {
    display: block;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
    line-height: 1.5;
}

a.pub-title svg.ext-arrow {
    display: inline-block;
    width: 10px;
    height: 10px;
    margin-left: 4px;
    vertical-align: super;
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

a.pub-title:hover {
    color: var(--accent-teal);
}

a.pub-title:hover svg.ext-arrow {
    transform: scale(1.3);
}

.pub-authors {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.2rem;
}

.pub-journal {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
}

/* ==========================================================================
   Software (compact card inside research sidebar)
   ========================================================================== */

.tool-card {
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    transition: border-color 0.3s;
    margin-bottom: 1rem;
}
.tool-card:hover { border-color: var(--border-hover); }

.software-mini-title {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.25rem;
}

.software-badge {
    font-size: 0.6rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent-teal);
    background: rgba(68, 170, 153, 0.1);
    border: 1px solid rgba(68, 170, 153, 0.2);
    padding: 0.15rem 0.5rem;
    border-radius: 20px;
}

.software-mini-name {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 0.5rem;
}

.software-mini-desc {
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 300;
    line-height: 1.6;
    margin-bottom: 0.75rem;
}

.software-mini-tags {
    margin-bottom: 0.75rem;
}

.software-mini-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--accent-teal);
    transition: color 0.3s;
}
.software-mini-link:hover { color: var(--accent-sand); }

/* Segmentation toggle labels */
.tools-area {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 1.25rem;
}

.tools-area .section-title {
    grid-column: 1 / -1;
}

.seg-toggles {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease;
}

body.tab-songmemory .seg-toggles {
    opacity: 1;
    pointer-events: auto;
}

.seg-caption {
    font-size: 0.8rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.seg-toggle {
    font-family: var(--font-body);
    font-size: 1.05rem;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s ease, opacity 0.3s ease;
}

.seg-toggle:hover {
    transform: scale(1.06);
}

.seg-toggle:not(.active) {
    opacity: 0.35;
}


/* ==========================================================================
   Contact
   ========================================================================== */

.contact { background: transparent; }

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    max-width: 800px;
}

.contact-affiliation {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.contact-address {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
}

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

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 0.5rem 0;
    transition: color 0.3s;
}
.contact-link:hover { color: var(--accent-teal); }
.contact-link svg { opacity: 0.6; transition: opacity 0.3s; flex-shrink: 0; }
.contact-link:hover svg { opacity: 1; }

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    background: var(--bg-dark);
    border-top: 1px solid var(--border-subtle);
    padding: 2rem 0;
    text-align: center;
}

.footer p {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ==========================================================================
   Scroll Animations
   ========================================================================== */

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}


/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 768px) {
    :root {
        --text-primary: #f0f4f8;
        --text-secondary: #c9d1d9;
        --text-muted: #8b949e;
        --accent-sand: #f0f4f8;
    }

    body { font-size: 15px; line-height: 1.6; font-weight: 700; }

    .hero-bg {
        position: absolute;
        top: 0;
        bottom: -300vh;
    }

    .container { padding: 0 1rem; }
    .hero-content { padding: 0 1rem; }

    .hero-intro {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 1rem;
    }

    .hero-photo-wrap { align-self: center; }
    .hero-photo { width: 180px; height: 180px; }
    .hero-icons a svg { width: 18px; height: 18px; }
    .hero-icons { gap: 1.5rem; }
    .hero-nav { gap: 1rem; margin-top: 0.75rem; }
    .hero-nav a { font-size: 0.75rem; }

    .hero-title { font-size: 1.8rem; }
    .hero-subtitle { font-size: 0.85rem; }

    .hero-about {
        max-width: none;
        font-size: 0.8rem;
        line-height: 1.6;
        margin-bottom: 0.5rem;
    }

    .research-tools-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .research-layout { grid-template-columns: 1fr; }

    .research-buttons {
        flex-direction: column;
        gap: 0.5rem;
    }

    .research-btn { min-width: 0; }
    .btn-label { font-size: 0.8rem; }
    .btn-sub { font-size: 0.65rem; }
    .btn-content { padding: 0.6rem 0.85rem; gap: 0.15rem; }
    .btn-accent { width: 3px; }
    .research-btn.active .btn-accent { width: 4px; }

    .panel-text p { font-size: 0.78rem; margin-bottom: 0.6rem; }
    .card-tag { font-size: 0.65rem; padding: 0.15rem 0.5rem; }

    .gallery-img { height: 100px; }
    .gallery-track.has-expanded .gallery-img { height: 60px; }
    .gallery-track.has-expanded .gallery-img.expanded { height: 200px; }

    .tools-area { grid-template-columns: 1fr; gap: 0; }
    .tool-card { padding: 1rem; margin-bottom: 0.5rem; }
    .software-mini-title { font-size: 0.95rem; }
    .software-mini-name { font-size: 0.7rem; }
    .software-mini-desc { font-size: 0.78rem; }
    .software-mini-link { font-size: 0.85rem; }

    .seg-toggles {
        position: static;
        flex-direction: row;
        gap: 0.75rem;
    }
    .seg-caption { font-size: 0.7rem; }
    .seg-toggle { font-size: 0.8rem; }

    .ephys-divider { height: 150px; }

    .pub-item { grid-template-columns: 1fr; gap: 0.2rem; padding: 1rem 0; }
    .pub-year { font-size: 0.85rem; }
    .pub-title { font-size: 0.82rem; }
    .pub-authors { font-size: 0.78rem; }
    .pub-journal { font-size: 0.75rem; }

    .contact-grid { grid-template-columns: 1fr; gap: 1.5rem; }
    .contact-affiliation { font-size: 0.95rem; }
    .contact-address, .contact-lab { font-size: 0.8rem; }
    .contact-link { font-size: 0.8rem; }

    .section { padding: 2.5rem 0; }
    .section-title { font-size: 1.3rem; margin-bottom: 1.5rem; }

    .panel-gallery-wide { margin-left: 0; width: 100%; }
}

/* ==========================================================================
   Reduced motion
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    html { scroll-behavior: auto; }
    .fade-in { opacity: 1; transform: none; }
}