:root {
    --marble: #f5f3ef;
    --warm-white: #faf8f5;
    --ink: #1c1917;
    --ink-soft: #44403c;
    --oxide: #8b3a2a;
    --oxide-bg: rgba(139, 58, 42, 0.06);
    --stone: #a8a29e;
    --stone-light: #d6d3cd;
    --teal: #00B48C;
    --teal-bg: rgba(0, 180, 140, 0.06);
    --gap-red: #c74634;
    --dark: #0f0f0e;
    --dark-surface: #1a1918;
    --serif: 'EB Garamond', Georgia, serif;
    --sans: 'Inter', -apple-system, sans-serif;
    --mono: 'JetBrains Mono', 'Fira Code', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    background: var(--marble);
    color: var(--ink);
    font-family: var(--serif);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

::selection { background: var(--oxide); color: var(--marble); }

.back-link {
    position: fixed; top: 16px; left: 24px;
    color: var(--stone); text-decoration: none;
    font-family: var(--sans); font-size: 0.7rem;
    letter-spacing: 1.5px; text-transform: uppercase;
    z-index: 100; transition: color 0.3s;
}
.back-link:hover { color: var(--oxide); }

/* ─── HEADER ─── */
.header { border-bottom: 1px solid var(--stone-light); }

.header-inner {
    max-width: 1200px; margin: 0 auto;
    padding: 28px 48px;
    display: flex; justify-content: space-between; align-items: baseline;
}

.logo { display: flex; align-items: baseline; gap: 14px; }

.logo-epsilon {
    font-family: var(--serif); font-size: 1.8rem;
    font-weight: 400; color: var(--oxide); font-style: italic;
}
.logo-epsilon.sm { font-size: 1.2rem; }

.logo-text {
    font-family: var(--sans); font-size: 0.72rem;
    font-weight: 500; letter-spacing: 7px;
}

.nav { display: flex; gap: 32px; }
.nav a {
    font-family: var(--sans); font-size: 0.78rem;
    color: var(--stone); text-decoration: none;
    letter-spacing: 0.5px; transition: color 0.2s;
}
.nav a:hover { color: var(--ink); }

/* ─── SECTION MARKERS ─── */
.section-marker {
    font-family: var(--mono); font-size: 0.72rem;
    color: var(--oxide); letter-spacing: 1px;
    margin-bottom: 12px; opacity: 0.7;
}

/* ─── HERO ─── */
.hero { padding: 80px 48px 60px; }

.hero-inner {
    max-width: 1200px; margin: 0 auto;
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 80px; align-items: start;
}

.hero-greek {
    font-family: var(--serif); font-size: 1.1rem;
    font-style: italic; color: var(--oxide);
    letter-spacing: 5px; margin-bottom: 24px;
}

h1 {
    font-family: var(--serif); font-size: 3.8rem;
    font-weight: 500; line-height: 1.1;
    letter-spacing: -1px; margin-bottom: 0;
}

.hero-rule { width: 40px; height: 2px; background: var(--oxide); margin: 32px 0; }

.hero-sub {
    font-size: 1.1rem; font-weight: 400;
    line-height: 1.8; opacity: 0.6; max-width: 440px;
}

.hero-meta {
    font-family: var(--sans); font-size: 0.7rem;
    letter-spacing: 2px; text-transform: uppercase;
    color: var(--stone); margin-top: 28px;
    display: flex; align-items: center; gap: 10px;
}

.meta-dot { width: 3px; height: 3px; background: var(--stone); border-radius: 50%; }

/* ─── FORMULA BLOCKS ─── */
.hero-right { padding-top: 20px; display: flex; flex-direction: column; gap: 24px; }

.formula-block {
    background: var(--warm-white);
    border: 1px solid var(--stone-light);
    border-left: 3px solid var(--oxide);
    padding: 24px 28px;
}

.fb-label {
    font-family: var(--mono); font-size: 0.68rem;
    color: var(--oxide); letter-spacing: 0.5px;
    margin-bottom: 14px; text-transform: uppercase;
}

.formula {
    font-family: var(--mono); font-size: 1.15rem;
    color: var(--ink); margin-bottom: 12px;
    display: flex; align-items: center; gap: 4px;
}

.math-frac {
    display: inline-flex; flex-direction: column;
    align-items: center; position: relative;
    padding: 0 4px;
}

.frac-top, .frac-bot {
    font-size: 0.85rem; line-height: 1.5;
}

.frac-top { border-bottom: 1px solid var(--ink); padding-bottom: 2px; }
.frac-bot { padding-top: 2px; }

.fb-note {
    font-family: var(--sans); font-size: 0.75rem;
    color: var(--stone); line-height: 1.6;
}

/* ─── VISUALIZATION ─── */
.viz-section {
    border-top: 1px solid var(--stone-light);
    border-bottom: 1px solid var(--stone-light);
    background: var(--warm-white);
    padding: 60px 48px;
}

.viz-inner { max-width: 1200px; margin: 0 auto; }

.viz-header { margin-bottom: 24px; }

.viz-header h2 {
    font-family: var(--serif); font-size: 1.6rem;
    font-weight: 500; margin-bottom: 8px;
}

.viz-caption {
    font-family: var(--sans); font-size: 0.85rem;
    color: var(--stone); line-height: 1.6;
}

.gap-mark { color: var(--gap-red); font-weight: 500; }

canvas#matchingViz {
    width: 100%; height: 360px;
    border: 1px solid var(--stone-light);
    background: var(--marble);
    margin-bottom: 16px;
}

.viz-legend {
    display: flex; gap: 24px;
    font-family: var(--mono); font-size: 0.7rem;
    color: var(--stone);
}

.legend-item { display: flex; align-items: center; gap: 6px; }
.dot { width: 8px; height: 8px; border-radius: 50%; }
.dot-source { background: var(--ink); }
.dot-match { background: var(--teal); }
.dot-gap { background: transparent; border: 2px solid var(--gap-red); width: 8px; height: 8px; }
.dot-search { background: var(--teal); opacity: 0.5; }

/* ─── METHOD ─── */
.method { padding: 80px 48px; }

.method-inner { max-width: 1200px; margin: 0 auto; }

.method-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 24px; margin-top: 32px;
}

.method-card {
    background: var(--dark); color: var(--marble);
    padding: 32px; border-radius: 2px;
    display: flex; flex-direction: column;
}

.mc-num {
    font-family: var(--serif); font-size: 2rem;
    font-style: italic; color: var(--oxide);
    margin-bottom: 8px; line-height: 1;
}

.mc-title {
    font-family: var(--mono); font-size: 0.75rem;
    letter-spacing: 1px; text-transform: uppercase;
    color: var(--stone); margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.mc-code {
    font-family: var(--mono); font-size: 0.78rem;
    line-height: 1.7; color: var(--stone);
    padding: 16px; margin-bottom: 20px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.05);
    flex-grow: 1;
}

.code-comment { color: #57534e; }
.code-key { color: var(--teal); }
.code-val { color: #fff; font-weight: 500; }
.code-match { color: var(--teal); }
.code-gap { color: var(--gap-red); }

.method-card > p {
    font-family: var(--sans); font-size: 0.85rem;
    color: var(--stone); line-height: 1.7;
}

/* ─── RESULTS ─── */
.results {
    border-top: 1px solid var(--stone-light);
    background: var(--warm-white);
    padding: 80px 48px;
}

.results-inner { max-width: 1200px; margin: 0 auto; }

.results-inner h2 {
    font-family: var(--serif); font-size: 2rem;
    font-weight: 500; margin-bottom: 8px;
}

.results-caption {
    font-family: var(--sans); font-size: 0.85rem;
    color: var(--stone); margin-bottom: 48px;
}

.results-grid {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.result-block {
    border-top: 2px solid var(--ink);
    padding-top: 20px;
}

.rb-val {
    font-family: var(--mono); font-size: 2.8rem;
    font-weight: 400; line-height: 1; letter-spacing: -1px;
    margin-bottom: 12px;
}

.rb-unit { font-size: 1.2rem; color: var(--oxide); margin-left: 2px; }

.rb-bar {
    height: 4px; background: var(--stone-light);
    margin-bottom: 12px; overflow: hidden;
}

.rb-fill { height: 100%; background: var(--teal); transition: width 1s ease-out; }

.rb-label {
    font-family: var(--mono); font-size: 0.7rem;
    letter-spacing: 0.5px; margin-bottom: 4px;
}

.rb-note {
    font-family: var(--sans); font-size: 0.75rem;
    color: var(--stone);
}

/* ─── INSTRUMENT ─── */
.instrument {
    border-top: 1px solid var(--stone-light);
    padding: 80px 48px;
}

.instrument-inner { max-width: 1200px; margin: 0 auto; }

.inst-grid {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 60px; align-items: start; margin-top: 24px;
}

.inst-label {
    font-family: var(--mono); font-size: 0.68rem;
    letter-spacing: 3px; text-transform: uppercase;
    color: var(--oxide); margin-bottom: 8px;
}

.inst-text h2 {
    font-family: var(--serif); font-size: 3.5rem;
    font-weight: 500; letter-spacing: 4px; margin-bottom: 4px;
}

.inst-full {
    font-family: var(--mono); font-size: 0.78rem;
    color: var(--stone); line-height: 1.6;
}

.inst-rule { width: 32px; height: 1px; background: var(--oxide); margin: 24px 0; }

.inst-text p {
    font-size: 1.02rem; line-height: 1.8;
    opacity: 0.6; margin-bottom: 1em;
}

/* Terminal */
.inst-terminal {
    background: var(--dark); border: 1px solid rgba(255,255,255,0.08);
    border-radius: 8px; overflow: hidden;
    box-shadow: 0 20px 50px rgba(0,0,0,0.12);
}

.term-chrome {
    display: flex; align-items: center; gap: 8px;
    padding: 10px 16px;
    background: var(--dark-surface);
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.term-dot { width: 12px; height: 12px; border-radius: 50%; }
.td-r { background: #ef4444; }
.td-y { background: #eab308; }
.td-g { background: #22c55e; }

.term-path {
    margin-left: auto; font-family: var(--mono);
    font-size: 0.68rem; color: #57534e;
}

.term-body {
    padding: 20px; font-family: var(--mono);
    font-size: 0.82rem; line-height: 1.9; color: var(--stone);
}

.tl.dim { color: #57534e; }
.tl.match { color: var(--teal); }
.tl.gap { color: var(--gap-red); }
.t-p { color: var(--teal); margin-right: 8px; }

.cursor { color: var(--teal); animation: blink 1s infinite; }
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

/* ─── PUBLICATIONS ─── */
.publications {
    border-top: 1px solid var(--stone-light);
    background: var(--warm-white);
    padding: 80px 48px;
}

.publications-inner { max-width: 1200px; margin: 0 auto; }

.publications-inner > h2 {
    font-family: var(--serif); font-size: 2rem;
    font-weight: 500; margin-bottom: 8px;
}

.pub-intro {
    font-family: var(--sans); font-size: 0.85rem;
    color: var(--stone); margin-bottom: 40px; line-height: 1.6;
    max-width: 700px;
}

.pub-section-title {
    font-family: var(--mono); font-size: 0.72rem;
    letter-spacing: 2px; text-transform: uppercase;
    color: var(--oxide); margin: 40px 0 16px;
    padding-top: 32px;
    border-top: 1px solid var(--stone-light);
}

.pub-card {
    background: var(--marble);
    border: 1px solid var(--stone-light);
    border-left: 3px solid transparent;
    padding: 28px 32px;
    margin-bottom: 16px;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.pub-card:hover {
    border-left-color: var(--oxide);
    box-shadow: 0 4px 24px rgba(0,0,0,0.04);
}

.pub-card.pub-upcoming {
    border-left-color: var(--teal);
    background: linear-gradient(135deg, var(--teal-bg), var(--marble));
}

.pub-badge {
    display: inline-block;
    font-family: var(--mono); font-size: 0.65rem;
    letter-spacing: 1.5px; text-transform: uppercase;
    color: var(--teal); background: var(--teal-bg);
    padding: 3px 10px; margin-bottom: 12px;
    border: 1px solid rgba(0, 180, 140, 0.15);
}

.pub-card h3 {
    font-family: var(--serif); font-size: 1.15rem;
    font-weight: 500; line-height: 1.5;
    margin-bottom: 8px; color: var(--ink);
}

.pub-authors {
    font-family: var(--sans); font-size: 0.8rem;
    color: var(--ink-soft); margin-bottom: 4px;
    font-weight: 400;
}

.pub-meta {
    font-family: var(--sans); font-size: 0.78rem;
    color: var(--stone); margin-bottom: 10px;
}

.pub-desc {
    font-family: var(--sans); font-size: 0.85rem;
    color: var(--ink-soft); line-height: 1.7;
    margin-bottom: 12px;
}

.pub-tags {
    display: flex; gap: 8px; flex-wrap: wrap;
}

.tag {
    font-family: var(--mono); font-size: 0.65rem;
    letter-spacing: 0.5px;
    color: var(--stone); background: var(--oxide-bg);
    padding: 3px 10px; border: 1px solid var(--stone-light);
}

.pub-links {
    display: flex; gap: 12px; align-items: center;
    padding-top: 8px;
}

.pub-doi {
    font-family: var(--mono); font-size: 0.75rem;
    color: var(--oxide); text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}
.pub-doi:hover { border-bottom-color: var(--oxide); }

.pub-pdf {
    font-family: var(--mono); font-size: 0.68rem;
    letter-spacing: 1px; text-transform: uppercase;
    color: var(--teal); text-decoration: none;
    padding: 2px 8px;
    border: 1px solid rgba(0, 180, 140, 0.3);
    transition: all 0.2s;
}
.pub-pdf:hover { background: var(--teal-bg); }

.pub-sources-row {
    display: flex; gap: 10px; flex-wrap: wrap;
    margin-top: 8px;
}

.source-chip {
    font-family: var(--sans); font-size: 0.8rem;
    color: var(--ink-soft); text-decoration: none;
    padding: 8px 16px;
    background: var(--marble);
    border: 1px solid var(--stone-light);
    transition: all 0.2s;
}
.source-chip:hover {
    border-color: var(--oxide);
    color: var(--oxide);
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.inst-subtitle {
    font-family: var(--serif); font-size: 1.3rem;
    font-style: italic; color: var(--stone);
    margin-bottom: 4px;
}

.hero-eyebrow {
    font-family: var(--serif); font-size: 1rem;
    font-style: italic; color: var(--oxide);
    letter-spacing: 2px; margin-bottom: 20px;
}

.formula-sm .math { font-size: 0.88rem; line-height: 2; }

/* ─── CONTACT ─── */
.contact {
    border-top: 1px solid var(--stone-light);
    padding: 80px 48px;
}

.contact-inner { max-width: 1200px; margin: 0 auto; max-width: 550px; }

.contact-inner h2 {
    font-family: var(--serif); font-size: 2rem;
    font-weight: 500; margin-bottom: 16px;
}

.contact-inner p {
    font-size: 1.05rem; line-height: 1.8;
    opacity: 0.6; margin-bottom: 28px;
}

.contact-link {
    font-family: var(--sans); font-size: 0.78rem;
    font-weight: 500; letter-spacing: 2px;
    text-transform: uppercase; color: var(--oxide);
    text-decoration: none; border-bottom: 1px solid var(--oxide);
    padding-bottom: 3px; transition: all 0.3s;
}
.contact-link:hover { letter-spacing: 3px; color: var(--ink); border-color: var(--ink); }

/* ─── FOOTER ─── */
.footer { border-top: 1px solid var(--stone-light); }

.footer-inner {
    max-width: 1200px; margin: 0 auto;
    padding: 24px 48px;
    display: flex; justify-content: space-between; align-items: center;
}

.footer-left {
    display: flex; align-items: center; gap: 12px;
    font-family: var(--sans); font-size: 0.72rem; color: var(--stone);
}

.footer-right {
    font-family: var(--serif); font-size: 0.8rem;
    font-style: italic; color: var(--stone);
}

/* ─── RESPONSIVE ─── */
@media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr; gap: 40px; }
    h1 { font-size: 2.8rem; }
    .method-grid { grid-template-columns: 1fr; }
    .results-grid { grid-template-columns: repeat(2, 1fr); }
    .inst-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
    .hero, .method, .results, .instrument, .contact, .viz-section { padding: 40px 20px; }
    .header-inner { flex-direction: column; gap: 12px; padding: 20px; }
    h1 { font-size: 2.2rem; }
    .formula { font-size: 0.9rem; }
    .results-grid { grid-template-columns: 1fr; }
    .footer-inner { flex-direction: column; gap: 12px; text-align: center; padding: 20px; }
}