/* =============================================
   Ryan Ridden-Harper — Portfolio Site Styles
   ============================================= */

:root {
    --bg:       #080b14;
    --surface:  rgba(13, 18, 32, 0.55);
    --surface2: rgba(19, 27, 46, 0.55);
    --border:   #1e2d4a;
    --accent:   #9b6dff;
    --accent-glow: rgba(155, 109, 255, 0.12);
    --purple:   #9b6dff;
    --gold:     #f5a84f;
    --green:    #4fca8b;
    --text:     #ffffff;
    --muted:    #c8d0dc;
    --font-body:    'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Space Grotesk', -apple-system, sans-serif;
    --radius:   10px;
    --radius-lg: 16px;
    --transition: 0.25s ease;
    --max-width: 1100px;
}

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

html { scroll-behavior: smooth; font-size: 16px; background-color: var(--bg); }

body {
    background-color: transparent;
    color: var(--text);
    font-family: var(--font-body);
    line-height: 1.7;
    overflow-x: hidden;
}


a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: #7ab8ff; }

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

/* ── Typography ── */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    line-height: 1.25;
    color: var(--text);
}

.section-label {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    color: var(--muted);
    font-size: 1.05rem;
    max-width: 600px;
    margin-bottom: 3rem;
}

/* ── Layout ── */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

section {
    padding: 6rem 0;
    position: relative;
    z-index: 1;
}

section:nth-child(even) {
    background: rgba(13, 18, 32, 0.4);
}

/* ── Navigation ── */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1.1rem 0;
    transition: background var(--transition), backdrop-filter var(--transition), box-shadow var(--transition);
}

nav.scrolled {
    background: rgba(8, 11, 20, 0.92);
    backdrop-filter: blur(16px);
    box-shadow: 0 1px 0 var(--border);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text);
    letter-spacing: -0.02em;
}

.nav-logo span { color: inherit; }

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color var(--transition);
}

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

.nav-cta {
    background: var(--accent);
    color: #fff !important;
    padding: 0.45rem 1.1rem;
    border-radius: 6px;
    font-size: 0.85rem !important;
}

.nav-cta:hover { background: #6aaffe; color: #fff !important; }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ── Hero ── */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding: 0;
    z-index: 1;
    background: transparent;
}

.hero-bg-image {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center 30%;
    background-repeat: no-repeat;
    opacity: 0.18;
    pointer-events: none;
    z-index: 0;
}

.stars {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.stars::before, .stars::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(1px 1px at 10% 20%, rgba(255,255,255,0.6) 0%, transparent 100%),
        radial-gradient(1px 1px at 25% 55%, rgba(255,255,255,0.4) 0%, transparent 100%),
        radial-gradient(1px 1px at 40% 10%, rgba(255,255,255,0.5) 0%, transparent 100%),
        radial-gradient(1px 1px at 60% 80%, rgba(255,255,255,0.3) 0%, transparent 100%),
        radial-gradient(1px 1px at 70% 30%, rgba(255,255,255,0.6) 0%, transparent 100%),
        radial-gradient(1px 1px at 85% 65%, rgba(255,255,255,0.4) 0%, transparent 100%),
        radial-gradient(1.5px 1.5px at 15% 75%, rgba(255,255,255,0.5) 0%, transparent 100%),
        radial-gradient(1px 1px at 50% 45%, rgba(255,255,255,0.3) 0%, transparent 100%),
        radial-gradient(1px 1px at 90% 10%, rgba(255,255,255,0.6) 0%, transparent 100%),
        radial-gradient(1px 1px at 5% 90%, rgba(255,255,255,0.4) 0%, transparent 100%),
        radial-gradient(1.5px 1.5px at 35% 35%, rgba(200,220,255,0.5) 0%, transparent 100%),
        radial-gradient(1px 1px at 75% 88%, rgba(255,255,255,0.35) 0%, transparent 100%),
        radial-gradient(1px 1px at 55% 15%, rgba(255,255,255,0.5) 0%, transparent 100%),
        radial-gradient(1px 1px at 20% 42%, rgba(255,255,255,0.3) 0%, transparent 100%),
        radial-gradient(1px 1px at 92% 55%, rgba(255,255,255,0.45) 0%, transparent 100%);
    background-size: 600px 600px;
}

.stars::after {
    background-size: 900px 900px;
    opacity: 0.6;
    transform: rotate(30deg);
}

.hero-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(155,109,255,0.06) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 8rem 1.5rem 4rem;
    width: 100%;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--accent-glow);
    border: 1px solid rgba(155,109,255,0.25);
    color: var(--accent);
    padding: 0.35rem 0.9rem;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.hero-badge::before {
    content: '';
    width: 6px; height: 6px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-name {
    font-size: clamp(2.4rem, 6vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
    line-height: 1.1;
}

.hero-name .highlight { color: inherit; }

.hero-title {
    font-size: clamp(1rem, 2.5vw, 1.3rem);
    color: var(--muted);
    font-weight: 400;
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--muted);
    max-width: 600px;
    line-height: 1.75;
    margin-bottom: 2.5rem;
}

.hero-description strong { color: var(--text); }

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 4rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background: #6aaffe;
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(155,109,255,0.3);
}

.btn-outline {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}

.hero-stats {
    display: flex;
    gap: 2.5rem;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1;
}

.stat-label {
    font-size: 0.78rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-top: 0.25rem;
}

/* ── About ── */
#about .about-grid {
    display: grid;
    grid-template-columns: 1fr 1.6fr;
    gap: 4rem;
    align-items: start;
}

.about-photo-block {
    position: sticky;
    top: 6rem;
}

.about-photo {
    width: 100%;
    aspect-ratio: 3/4;
    border-radius: var(--radius-lg);
    background: var(--surface2);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.about-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-lg);
}

.about-photo-placeholder {
    color: var(--muted);
    font-size: 0.85rem;
    text-align: center;
    padding: 2rem;
}

.about-links {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.about-link {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 0.9rem;
    border-radius: 8px;
    background: var(--surface2);
    border: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all var(--transition);
}

.about-link:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.about-link svg { flex-shrink: 0; }

.about-bio p {
    color: var(--muted);
    margin-bottom: 1.2rem;
    font-size: 1.02rem;
}

.about-bio p strong { color: var(--text); }

.about-interests {
    margin-top: 2rem;
}

.about-interests h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
    margin-bottom: 0.75rem;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background: var(--surface2);
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 0.3rem 0.75rem;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 500;
}

.tag-blue { border-color: rgba(155,109,255,0.3); color: var(--accent); background: var(--accent-glow); }
.tag-purple { border-color: rgba(155,109,255,0.3); color: var(--purple); background: rgba(155,109,255,0.08); }
.tag-gold { border-color: rgba(245,168,79,0.3); color: var(--gold); background: rgba(245,168,79,0.08); }
.tag-green { border-color: rgba(79,202,139,0.3); color: var(--green); background: rgba(79,202,139,0.08); }

/* ── Research ── */
.pub-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem 2rem;
    align-items: flex-start;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

#research .pub-filters {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    flex: 1;
    min-width: 280px;
}

.pub-sort {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.sort-label {
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    white-space: nowrap;
}

.sort-btns {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
}

.sort-btn {
    padding: 0.35rem 0.8rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font-body);
    white-space: nowrap;
}

.sort-btn:hover, .sort-btn.active {
    background: var(--surface2);
    border-color: var(--accent);
    color: var(--accent);
}

.filter-btn {
    padding: 0.4rem 1rem;
    border-radius: 100px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font-body);
}

.filter-btn:hover, .filter-btn.active {
    background: var(--accent-glow);
    border-color: var(--accent);
    color: var(--accent);
}

.pub-grid {
    display: grid;
    gap: 1.25rem;
}

.recent-pub-teaser {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.recent-pub-teaser .pub-header {
    flex-direction: column;
    gap: 0.5rem;
}

.recent-pub-teaser .pub-badges {
    flex-shrink: 1;
}

.pub-card {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem 1.75rem;
    transition: border-color var(--transition), box-shadow var(--transition);
    position: relative;
}

.pub-card:hover {
    border-color: rgba(155,109,255,0.35);
    box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}

.pub-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.pub-badges {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
    flex-shrink: 0;
}

.badge {
    display: inline-block;
    padding: 0.2rem 0.55rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.badge-lead { background: rgba(155,109,255,0.15); color: var(--accent); border: 1px solid rgba(155,109,255,0.3); }
.badge-nature { background: rgba(79,202,139,0.15); color: var(--green); border: 1px solid rgba(79,202,139,0.3); }
.badge-hot { background: rgba(245,168,79,0.15); color: var(--gold); border: 1px solid rgba(245,168,79,0.3); }
.badge-software { background: rgba(155,109,255,0.15); color: var(--purple); border: 1px solid rgba(155,109,255,0.3); }
.badge-student { background: rgba(79,202,139,0.15); color: var(--green); border: 1px solid rgba(79,202,139,0.3); }

.pub-card[data-student="true"] {
    border-left: 3px solid var(--green);
}

.pub-title {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1.4;
    flex: 1;
}

.pub-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.9rem;
    flex-wrap: wrap;
}

.pub-journal {
    font-style: italic;
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 500;
}

.pub-year {
    color: var(--muted);
    font-size: 0.85rem;
}

.pub-citations {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    color: var(--muted);
    font-size: 0.82rem;
}

.pub-citations svg { color: var(--gold); }

.pub-summary {
    color: var(--muted);
    font-size: 0.9rem;
    line-height: 1.65;
    margin-bottom: 1rem;
}

.pub-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.pub-authors {
    color: var(--muted);
    font-size: 0.78rem;
    font-style: italic;
}

.pub-links {
    display: flex;
    gap: 0.5rem;
}

.pub-link {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.3rem 0.65rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 500;
    transition: all var(--transition);
}

.pub-link:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* hidden by filter */
.pub-card.hidden { display: none; }

/* ── Research section background illustration ── */
.section-with-bg {
    position: relative;
}

.section-with-bg::before {
    content: '';
    position: absolute;
    top: 0; right: 0;
    width: 45%;
    height: 100%;
    background-image: var(--section-bg);
    background-size: cover;
    background-position: center;
    opacity: 0.055;
    pointer-events: none;
    mask-image: linear-gradient(to left, rgba(0,0,0,0.7) 0%, transparent 100%);
    -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,0.7) 0%, transparent 100%);
}

/* ── Software ── */
#software .software-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.25rem;
}

.sw-card {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
    display: flex;
    flex-direction: column;
}

.sw-card:hover {
    border-color: rgba(155,109,255,0.35);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.35);
}

.sw-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.sw-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    flex-shrink: 0;
}

.sw-stars {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    color: var(--gold);
    font-size: 0.82rem;
    font-weight: 600;
}

.sw-name {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    letter-spacing: -0.02em;
}

.sw-tagline {
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 500;
    margin-bottom: 0.9rem;
}

.sw-description {
    color: var(--muted);
    font-size: 0.88rem;
    line-height: 1.65;
    flex: 1;
    margin-bottom: 1.25rem;
}

.sw-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 1.25rem;
}

.sw-tag {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 0.2rem 0.55rem;
    border-radius: 4px;
    font-size: 0.73rem;
    font-weight: 500;
}

.sw-footer {
    display: flex;
    gap: 0.5rem;
    margin-top: auto;
}

.sw-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    padding: 0.55rem 0.75rem;
    border-radius: 7px;
    border: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.8rem;
    font-weight: 500;
    transition: all var(--transition);
}

.sw-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.sw-btn-primary {
    background: var(--accent-glow);
    border-color: rgba(155,109,255,0.3);
    color: var(--accent);
}

/* ── Outreach ── */
.outreach-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.outreach-section {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
}

.outreach-section.full-width {
    grid-column: 1 / -1;
}

.outreach-section-title {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.outreach-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.outreach-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.outreach-item {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    padding-bottom: 0.85rem;
    border-bottom: 1px solid var(--border);
}

.outreach-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.outreach-item-title {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text);
}

.outreach-item-title a {
    color: var(--text);
}

.outreach-item-title a:hover { color: var(--accent); }

.outreach-item-meta {
    font-size: 0.78rem;
    color: var(--muted);
}

.outreach-item-desc {
    font-size: 0.83rem;
    color: var(--muted);
    line-height: 1.5;
}

.youtube-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    border-radius: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    transition: border-color var(--transition);
    margin-bottom: 0.6rem;
}

.youtube-card:last-child { margin-bottom: 0; }

.youtube-card:hover { border-color: rgba(255,60,60,0.4); }

.yt-thumb {
    width: 110px;
    height: 70px;
    border-radius: 6px;
    background: var(--surface2);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    font-size: 1.2rem;
    overflow: hidden;
}

.yt-thumb img { width: 100%; height: 100%; object-fit: cover; }

.yt-info { flex: 1; min-width: 0; }

.yt-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1.35;
    margin-bottom: 0.2rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.yt-meta { font-size: 0.75rem; color: var(--muted); }

/* ── YouTube featured embed ── */
.yt-featured {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.25rem;
    align-items: start;
}

.yt-embed-wrap {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--surface);
}

.yt-embed-wrap iframe {
    position: absolute;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    border-radius: var(--radius);
}

.yt-featured-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #ff6b6b;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.yt-featured-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.35;
    margin-bottom: 0.75rem;
}

.yt-featured-desc {
    color: var(--muted);
    font-size: 0.88rem;
    line-height: 1.65;
}

.yt-more-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 0.65rem;
    margin-bottom: 1rem;
}

@media (max-width: 700px) {
    .yt-featured {
        grid-template-columns: 1fr;
    }
}

.channel-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    background: rgba(255,60,60,0.1);
    border: 1px solid rgba(255,60,60,0.25);
    color: #ff6b6b;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all var(--transition);
}

.channel-cta:hover {
    background: rgba(255,60,60,0.18);
    color: #ff6b6b;
}

/* ── Contact ── */
#contact .contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.contact-text p {
    color: var(--muted);
    font-size: 1rem;
    line-height: 1.75;
    margin-bottom: 1rem;
}

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

.contact-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    transition: all var(--transition);
}

.contact-card:hover {
    border-color: var(--accent);
    transform: translateX(3px);
}

.contact-card-icon {
    width: 40px;
    height: 40px;
    border-radius: 9px;
    background: var(--accent-glow);
    border: 1px solid rgba(155,109,255,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1rem;
}

.contact-card-info {
    display: flex;
    flex-direction: column;
}

.contact-card-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin-bottom: 0.15rem;
}

.contact-card-value {
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--text);
}

/* ── Footer ── */
footer {
    background: rgba(13, 18, 32, 0.6);
    border-top: 1px solid var(--border);
    padding: 2.5rem 0;
    text-align: center;
    position: relative;
    z-index: 1;
}

footer p {
    color: var(--muted);
    font-size: 0.85rem;
}

footer a { color: var(--accent); }

/* ── Responsive ── */
@media (max-width: 900px) {
    .recent-pub-teaser { grid-template-columns: 1fr 1fr; }

    #about .about-grid {
        grid-template-columns: 1fr;
    }

    .about-photo-block {
        position: static;
        display: grid;
        grid-template-columns: 180px 1fr;
        gap: 1.5rem;
        align-items: start;
    }

    .about-photo {
        aspect-ratio: 1;
        margin-bottom: 0;
    }

    .outreach-grid {
        grid-template-columns: 1fr;
    }

    #contact .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 700px) {
    .nav-links { display: none; }
    .nav-links.open {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 0; left: 0; right: 0; bottom: 0;
        background: rgba(8,11,20,0.97);
        align-items: center;
        justify-content: center;
        gap: 2rem;
        font-size: 1.4rem;
        z-index: 99;
    }
    .nav-toggle { display: flex; }

    .about-photo-block {
        grid-template-columns: 1fr;
    }

    .hero-stats { gap: 1.5rem; }

    section { padding: 4rem 0; }

    .software-grid { grid-template-columns: 1fr !important; }
    .recent-pub-teaser { grid-template-columns: 1fr; }
}

.collab-inst-heading {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    margin-bottom: 0.4rem;
}

.collab-inst-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.collab-inst-list li {
    font-size: 0.8rem;
    color: var(--muted);
    padding: 0.18rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.04);
}

@media (max-width: 500px) {
    .pub-header { flex-direction: column; }
    .pub-badges { flex-direction: row; }
    .hero-actions { flex-direction: column; }
    .btn { justify-content: center; }
}