/* ============================================================
   S. Sosa — site styles
   ============================================================ */

:root {
    --bg: #0D0C0A;
    --surface: #141310;
    --border-subtle: rgba(240, 235, 224, 0.08);
    --border-mid: rgba(240, 235, 224, 0.12);
    --text: #F0EBE0;
    --text-secondary: #A09688;
    --text-muted: #6B6358;
    --text-faint: #5C5648;
    --text-very-faint: #3A3830;
    --accent: #B5926A;
    --accent-hover: #C8A87E;

    --font-display: 'Cormorant Garamond', serif;
    --font-mono: 'DM Mono', monospace;
    --font-body: 'Instrument Sans', sans-serif;

    --max-width: 1240px;
    --pad-x: 48px;
}

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

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

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    font-weight: 300;
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}

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

button, input, select, textarea { font: inherit; color: inherit; }

::selection { background: var(--accent); color: var(--bg); }

/* ---------- Layout primitives ---------- */

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

.section {
    padding: 120px 0;
    border-top: 0.5px solid var(--border-subtle);
}

.section-label {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-faint);
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 48px;
}

.section-label::after {
    content: "";
    flex: 1;
    height: 0.5px;
    background: var(--border-subtle);
}

/* ---------- Navigation ---------- */

.nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(13, 12, 10, 0.92);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 0.5px solid var(--border-subtle);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 20px var(--pad-x);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 13px;
    letter-spacing: 0.08em;
    color: var(--text);
}

.nav-links {
    display: flex;
    gap: 36px;
    list-style: none;
    align-items: center;
}

.nav-links a {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 12px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

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

.nav-links a.active {
    color: var(--accent);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--text);
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 1px;
    background: currentColor;
    margin: 5px 0;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Buttons ---------- */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    border: 0.5px solid transparent;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-ghost {
    background: transparent;
    color: var(--text);
    border-color: var(--border-mid);
}

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

.btn-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text);
    padding: 14px 0;
}

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

/* ---------- Hero (index) ---------- */

.hero {
    padding: 140px 0 120px;
}

.hero-inner {
    display: flex;
    align-items: center;
    gap: 64px;
}

.hero-text { flex: 1; min-width: 0; }

.hero-photo {
    flex-shrink: 0;
    width: clamp(220px, 28vw, 340px);
}

.hero-profile-img {
    width: 100%;
    height: auto;
    display: block;
    border: 0.5px solid var(--border-subtle);
}

.hero-eyebrow {
    display: flex;
    align-items: center;
    gap: 16px;
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 48px;
}

.hero-eyebrow::before {
    content: "";
    width: 32px;
    height: 0.5px;
    background: var(--accent);
}

.hero-name {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(64px, 11vw, 108px);
    line-height: 1;
    letter-spacing: -0.02em;
    margin-bottom: 40px;
}

.hero-name .hero-name-accent {
    font-style: italic;
    color: var(--accent);
}

.hero-tagline {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 12px;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 48px;
}

.hero-bio {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: 19px;
    line-height: 1.65;
    color: var(--text-secondary);
    max-width: 640px;
    margin-bottom: 56px;
}

.hero-ctas {
    display: flex;
    gap: 16px;
    align-items: center;
    flex-wrap: wrap;
}

/* ---------- Stats bar ---------- */

.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    background: var(--border-subtle);
    gap: 1px;
    border-top: 0.5px solid var(--border-subtle);
    border-bottom: 0.5px solid var(--border-subtle);
}

.stat {
    background: var(--bg);
    padding: 48px 32px;
}

.stat-number {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: 42px;
    line-height: 1;
    color: var(--text);
    margin-bottom: 12px;
}

.stat-label {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-muted);
}

/* ---------- Project cards ---------- */

.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    border-top: 0.5px solid var(--border-subtle);
}

.project-card {
    padding: 48px 0;
    border-bottom: 0.5px solid var(--border-subtle);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.project-card.project-featured {
    padding: 72px 0;
}

.project-card-text .project-tag,
.project-tag {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.project-title {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: 42px;
    line-height: 1.1;
    letter-spacing: -0.01em;
    margin-bottom: 20px;
    color: var(--text);
}

.project-featured .project-title {
    font-size: 54px;
}

.project-desc {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 560px;
}

.project-link {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

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

/* Inline bar chart (SIFT viz) */
.viz {
    border: 0.5px solid var(--border-subtle);
    padding: 40px;
    background: var(--surface);
}

.viz-label {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-faint);
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
}

.viz-bars {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 180px;
    border-bottom: 0.5px solid var(--border-mid);
    padding-bottom: 1px;
}

.viz-bar {
    flex: 1;
    background: var(--accent);
    opacity: 0.25;
    transition: opacity 0.3s ease;
}

.viz-bar.viz-bar-peak { opacity: 0.95; }

.viz-x {
    display: flex;
    justify-content: space-between;
    margin-top: 12px;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.12em;
    color: var(--text-very-faint);
}

/* Projects page: 2-col card grid */
.card-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    background: var(--border-subtle);
    gap: 1px;
    border: 0.5px solid var(--border-subtle);
}

.card {
    background: var(--bg);
    padding: 48px 40px;
    display: flex;
    flex-direction: column;
    min-height: 280px;
}

.card .project-tag { margin-bottom: 20px; }

.card .project-title {
    font-size: 32px;
    margin-bottom: 16px;
}

.card .project-desc {
    font-size: 15px;
    margin-bottom: auto;
    padding-bottom: 32px;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    border-top: 0.5px solid var(--border-subtle);
}

.status-badge {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 9px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 4px 10px;
    border: 0.5px solid var(--border-mid);
}

.status-active { color: var(--accent); border-color: var(--accent); }
.status-published { color: var(--text); }

/* ---------- Giants section ---------- */

.giants-quote {
    font-family: var(--font-display);
    font-weight: 300;
    font-style: italic;
    font-size: 36px;
    line-height: 1.3;
    color: var(--text);
    max-width: 720px;
    margin: 0 auto 72px;
    text-align: center;
}

.giants-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    background: var(--border-subtle);
    gap: 1px;
    border: 0.5px solid var(--border-subtle);
}

.giant {
    background: var(--bg);
    padding: 48px 36px;
}

.giant-icon {
    color: var(--accent);
    font-size: 18px;
    margin-bottom: 32px;
}

.giant-name {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 26px;
    margin-bottom: 8px;
}

.giant-role {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 28px;
}

.giant-quote {
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 300;
    font-size: 18px;
    line-height: 1.5;
    color: var(--text-secondary);
}

/* ---------- CTA band ---------- */

.cta-band {
    border-top: 0.5px solid var(--border-subtle);
    border-bottom: 0.5px solid var(--border-subtle);
    padding: 96px 0;
}

.cta-band-inner {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 48px;
    align-items: center;
}

.cta-text {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: 52px;
    line-height: 1.15;
    letter-spacing: -0.01em;
    color: var(--text);
    max-width: 640px;
}

.cta-text em {
    font-style: italic;
    color: var(--accent);
}

.cta-band-cta {
    text-align: right;
}

/* ---------- Footer ---------- */

.footer {
    border-top: 0.5px solid var(--border-subtle);
    padding: 40px 0;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: 28px;
    list-style: none;
}

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

/* ---------- Page hero (secondary pages) ---------- */

.page-hero {
    padding: 120px 0 80px;
}

.page-hero-label {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 11px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 32px;
}

.page-hero h1 {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(48px, 7vw, 84px);
    line-height: 1.05;
    letter-spacing: -0.015em;
    color: var(--text);
    max-width: 860px;
}

.page-hero h1 em { font-style: italic; color: var(--accent); }

.page-hero-sub {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: 18px;
    line-height: 1.6;
    color: var(--text-secondary);
    max-width: 620px;
    margin-top: 28px;
}

/* ---------- Research page ---------- */

.research-layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 80px;
    padding: 80px 0 120px;
    border-top: 0.5px solid var(--border-subtle);
}

.research-sidebar {
    position: sticky;
    top: 100px;
    align-self: start;
}

.research-sidebar ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.research-sidebar a {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
    padding-left: 16px;
    border-left: 0.5px solid var(--border-subtle);
    display: block;
    padding-top: 4px;
    padding-bottom: 4px;
}

.research-sidebar a:hover,
.research-sidebar a.active {
    color: var(--accent);
    border-left-color: var(--accent);
}

.research-content > section {
    margin-bottom: 96px;
}

.research-content h2 {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: 36px;
    letter-spacing: -0.01em;
    margin-bottom: 24px;
    color: var(--text);
}

.research-content h3 {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 24px;
    margin-bottom: 12px;
    color: var(--text);
}

.research-content p {
    font-size: 17px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 20px;
    max-width: 720px;
}

.research-content p strong {
    font-weight: 500;
    color: var(--text);
}

.pub-card {
    border: 0.5px solid var(--border-subtle);
    padding: 40px;
    background: var(--surface);
}

.pub-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 24px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.pub-title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 24px;
    line-height: 1.3;
    color: var(--text);
    max-width: 560px;
}

.pub-meta {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
    display: flex;
    gap: 12px;
    align-items: center;
    flex-shrink: 0;
}

.pub-abstract {
    font-size: 15px;
    line-height: 1.65;
    color: var(--text-secondary);
    margin-bottom: 28px;
    max-width: 720px;
}

.pub-doi {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 12px;
}

.tag {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-secondary);
    padding: 8px 14px;
    border: 0.5px solid var(--border-mid);
}

/* ---------- Blog ---------- */

.blog-list {
    border-top: 0.5px solid var(--border-subtle);
}

.post-card {
    display: grid;
    grid-template-columns: 180px 1fr auto;
    gap: 48px;
    align-items: center;
    padding: 44px 0;
    border-bottom: 0.5px solid var(--border-subtle);
    transition: opacity 0.2s ease;
}

.post-card:hover { opacity: 0.85; }

.post-meta {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.post-meta-tag { color: var(--accent); display: block; margin-bottom: 8px; }

.post-title {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: 32px;
    line-height: 1.25;
    color: var(--text);
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

.post-excerpt {
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-secondary);
    max-width: 620px;
}

.post-read {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    white-space: nowrap;
}

/* ---------- Gallery ---------- */

.gallery-filters {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 48px;
    padding-bottom: 32px;
    border-bottom: 0.5px solid var(--border-subtle);
}

.filter-btn {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 10px 18px;
    background: transparent;
    border: 0.5px solid var(--border-subtle);
    cursor: pointer;
    transition: color 0.2s ease, border-color 0.2s ease;
}

.filter-btn:hover { color: var(--text); }

.filter-btn.active {
    color: var(--accent);
    border-color: var(--accent);
}

.masonry {
    columns: 3;
    column-gap: 16px;
    padding-bottom: 120px;
}

.masonry-item {
    break-inside: avoid;
    background: var(--surface);
    border: 0.5px solid var(--border-subtle);
    margin-bottom: 16px;
    overflow: hidden;
    position: relative;
}

.masonry-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.4s ease;
}

.masonry-item:hover img { transform: scale(1.03); }

.ar-3-4 { aspect-ratio: 3 / 4; }
.ar-1-1 { aspect-ratio: 1 / 1; }
.ar-4-5 { aspect-ratio: 4 / 5; }
.ar-2-3 { aspect-ratio: 2 / 3; }
.ar-16-9 { aspect-ratio: 16 / 9; }
.ar-3-2 { aspect-ratio: 3 / 2; }

/* ---------- Contact ---------- */

.contact-wrap {
    padding: 120px 0 160px;
    border-top: 0.5px solid var(--border-subtle);
    text-align: center;
}

.contact-heading {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(56px, 9vw, 96px);
    line-height: 1.05;
    letter-spacing: -0.02em;
    margin-bottom: 32px;
}

.contact-heading em { font-style: italic; color: var(--accent); }

.contact-sub {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 96px;
}

.contact-cols {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    max-width: 960px;
    margin: 0 auto;
    text-align: left;
    border-top: 0.5px solid var(--border-subtle);
    padding-top: 72px;
}

.contact-col .section-label { margin-bottom: 32px; }

.contact-intro {
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.contact-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.contact-link {
    display: block;
    padding: 20px 0;
    border-bottom: 0.5px solid var(--border-subtle);
}

.contact-link-label {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.contact-link-value {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 22px;
    color: var(--accent);
    transition: color 0.2s ease;
}

.contact-link:hover .contact-link-value { color: var(--accent-hover); }

/* ---------- Responsive ---------- */

@media (max-width: 980px) {
    :root { --pad-x: 32px; }

    .cta-band-inner { grid-template-columns: 1fr; text-align: left; }
    .cta-band-cta { text-align: left; }
    .cta-text { font-size: 40px; }

    .project-card {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .project-featured .project-title { font-size: 42px; }

    .research-layout { grid-template-columns: 1fr; gap: 48px; }
    .research-sidebar { position: static; }
    .research-sidebar ul { flex-direction: row; flex-wrap: wrap; gap: 8px; }
    .research-sidebar a { border-left: none; border: 0.5px solid var(--border-subtle); padding: 8px 14px; }

    .masonry { columns: 2; }
}

@media (max-width: 768px) {
    :root { --pad-x: 24px; }

    .section { padding: 80px 0; }
    .hero { padding: 80px 0; }
    .hero-inner { flex-direction: column; gap: 40px; align-items: flex-start; }
    .hero-photo { width: min(70%, 280px); }

    .nav-toggle { display: block; }

    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: rgba(13, 12, 10, 0.98);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        border-bottom: 0.5px solid var(--border-subtle);
        padding: 16px 0;
        transform: translateY(-8px);
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.2s ease, transform 0.2s ease;
    }

    .nav-links.open {
        opacity: 1;
        transform: translateY(0);
        pointer-events: auto;
    }

    .nav-links a {
        display: block;
        padding: 14px var(--pad-x);
        border-bottom: 0.5px solid var(--border-subtle);
    }

    .nav-links li:last-child a { border-bottom: none; }

    .stats { grid-template-columns: repeat(2, 1fr); }

    .card-grid,
    .giants-grid {
        grid-template-columns: 1fr;
    }

    .post-card {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .masonry { columns: 1; }

    .contact-cols { grid-template-columns: 1fr; gap: 48px; }

    .giants-quote { font-size: 26px; }
}