/* ============================================================
   HellaSwag Research Showcase — Indigo Ink Editorial Theme
   Palette: #1B0A3C · #3D1E7C · #7B68EE · #E8E0F0 · #F5F2FF
   Fonts: Cormorant Garamond (display) + Manrope (body) + Space Mono (code)
   ============================================================ */

:root {
  --ink:       #1B0A3C;
  --deep:      #3D1E7C;
  --violet:    #7B68EE;
  --lavender:  #E8E0F0;
  --frost:     #F5F2FF;
  --white:     #FDFCFF;
  --muted:     #9B8EC4;
  --accent:    #C4B5FD;
  --gold:      #E6C07B;

  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body:    'Manrope', sans-serif;
  --font-mono:    'Space Mono', monospace;

  --max-w: 1200px;
  --section-pad: 7rem 2rem;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--ink);
  color: var(--lavender);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: var(--violet); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent); }

/* ── Utility ── */
.mono { font-family: var(--font-mono); font-size: .85em; }

/* ── Reveal animation ── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: .9rem 2rem;
  background: rgba(27, 10, 60, 0);
  backdrop-filter: blur(0px);
  transition: background .4s, backdrop-filter .4s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(27, 10, 60, .92);
  backdrop-filter: blur(12px);
  border-bottom-color: rgba(123, 104, 238, .2);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.nav-label {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid rgba(123,104,238,.3);
  padding: .25rem .6rem;
  border-radius: 2px;
}
.nav-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--white);
  flex: 1;
}
.nav-cta {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--violet);
  border: 1px solid var(--violet);
  padding: .35rem .9rem;
  border-radius: 2px;
  transition: background .2s, color .2s;
}
.nav-cta:hover {
  background: var(--violet);
  color: var(--white);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8rem 2rem 5rem;
  overflow: hidden;
}

/* Subtle grid background */
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(123,104,238,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(123,104,238,.06) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}
.hero-bg-grid::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 40%, rgba(61,30,124,.5) 0%, transparent 70%);
}

.hero-content {
  position: relative;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
}

.hero-eyebrow {
  display: flex;
  gap: .6rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}
.tag {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--violet);
  border: 1px solid rgba(123,104,238,.4);
  padding: .3rem .75rem;
  border-radius: 2px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 9vw, 8rem);
  font-weight: 300;
  line-height: 1.0;
  color: var(--white);
  letter-spacing: -.02em;
  margin-bottom: 2.5rem;
}
.hero-title em {
  font-style: italic;
  color: var(--accent);
}

.hero-authors {
  font-family: var(--font-body);
  font-size: .95rem;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: .04em;
  margin-bottom: .5rem;
}
.hero-affil {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: rgba(155,142,196,.6);
  letter-spacing: .08em;
}

/* Stats row */
.hero-stats {
  position: relative;
  max-width: var(--max-w);
  margin: 4rem auto 0;
  width: 100%;
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  align-items: flex-end;
}
.stat-card {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: 1.5rem 2rem;
  border: 1px solid rgba(123,104,238,.25);
  background: rgba(61,30,124,.15);
  backdrop-filter: blur(8px);
  border-radius: 4px;
  min-width: 160px;
}
.stat-num {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 600;
  color: var(--white);
  line-height: 1;
}
.stat-num-large {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: 1.5rem 2rem;
  border: 1px solid rgba(230,192,123,.3);
  background: rgba(230,192,123,.06);
  border-radius: 4px;
  min-width: 160px;
}
.stat-big {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 600;
  color: var(--gold);
  line-height: 1;
}
.stat-label {
  font-family: var(--font-mono);
  font-size: .65rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: .65rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: rgba(155,142,196,.4);
  animation: bounce 2s ease-in-out infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(6px); }
}

/* ============================================================
   PULL QUOTE
   ============================================================ */
.pull-quote-section {
  padding: 5rem 2rem;
  background: linear-gradient(135deg, rgba(61,30,124,.4) 0%, rgba(27,10,60,.8) 100%);
  border-top: 1px solid rgba(123,104,238,.15);
  border-bottom: 1px solid rgba(123,104,238,.15);
}
.pull-quote {
  max-width: 860px;
  margin: 0 auto;
  position: relative;
  padding-left: 3rem;
}
.pq-mark {
  position: absolute;
  left: 0;
  top: -.5rem;
  font-family: var(--font-display);
  font-size: 6rem;
  line-height: 1;
  color: var(--violet);
  opacity: .4;
  font-style: italic;
}
blockquote {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 300;
  font-style: italic;
  color: var(--white);
  line-height: 1.4;
  margin-bottom: 1.2rem;
}
cite {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--muted);
}

/* ============================================================
   SECTIONS — shared
   ============================================================ */
.section {
  padding: var(--section-pad);
}
.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.section-label {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--violet);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: .75rem;
}
.section-label::before {
  content: '';
  display: inline-block;
  width: 2rem;
  height: 1px;
  background: var(--violet);
}
.section-heading {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 300;
  color: var(--white);
  line-height: 1.1;
  margin-bottom: 3rem;
  letter-spacing: -.01em;
}

/* ============================================================
   ABSTRACT
   ============================================================ */
.abstract-section {
  background: rgba(27,10,60,.5);
}
.abstract-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 4rem;
  align-items: start;
}
.abstract-text p {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--lavender);
  margin-bottom: 1.4rem;
}
.abstract-text p:last-child { margin-bottom: 0; }
.abstract-text em {
  font-style: italic;
  color: var(--accent);
}
.abstract-sidebar {
  border: 1px solid rgba(123,104,238,.2);
  border-radius: 4px;
  overflow: hidden;
}
.sidebar-item {
  display: flex;
  flex-direction: column;
  gap: .2rem;
  padding: .9rem 1.2rem;
  border-bottom: 1px solid rgba(123,104,238,.12);
}
.sidebar-item:last-child { border-bottom: none; }
.sidebar-key {
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}
.sidebar-val {
  font-size: .88rem;
  color: var(--lavender);
  font-weight: 500;
}
.sidebar-val.mono {
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--accent);
}

/* ============================================================
   CONTRIBUTION
   ============================================================ */
.contribution-section {
  background: var(--ink);
}
.contribution-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.contrib-card {
  padding: 2rem 1.5rem;
  border: 1px solid rgba(123,104,238,.18);
  border-radius: 4px;
  background: rgba(61,30,124,.1);
  transition: border-color .3s, background .3s, transform .3s;
  position: relative;
  overflow: hidden;
}
.contrib-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--violet), transparent);
  opacity: 0;
  transition: opacity .3s;
}
.contrib-card:hover {
  border-color: rgba(123,104,238,.5);
  background: rgba(61,30,124,.25);
  transform: translateY(-4px);
}
.contrib-card:hover::before { opacity: 1; }
.contrib-num {
  font-family: var(--font-mono);
  font-size: .65rem;
  letter-spacing: .15em;
  color: var(--violet);
  margin-bottom: 1rem;
}
.contrib-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: .75rem;
  line-height: 1.2;
}
.contrib-card p {
  font-size: .88rem;
  color: var(--muted);
  line-height: 1.65;
}

/* ============================================================
   PERFORMANCE BARS
   ============================================================ */
.perf-section {
  background: rgba(27,10,60,.6);
}
.perf-bars {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
  margin-bottom: 2rem;
}
.perf-row {
  display: grid;
  grid-template-columns: 220px 1fr 70px;
  align-items: center;
  gap: 1.2rem;
}
.perf-model {
  font-family: var(--font-body);
  font-size: .88rem;
  font-weight: 500;
  color: var(--lavender);
  text-align: right;
}
.perf-bar-wrap {
  height: 28px;
  background: rgba(123,104,238,.1);
  border-radius: 2px;
  overflow: hidden;
  border: 1px solid rgba(123,104,238,.15);
}
.perf-bar {
  height: 100%;
  width: 0;
  background: var(--color);
  border-radius: 2px;
  transition: width 1.2s cubic-bezier(.4,0,.2,1);
}
.perf-bar.animated {
  width: calc(var(--pct) * 1%);
}
.perf-score {
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--accent);
  font-weight: 700;
}
.perf-note {
  font-size: .88rem;
  color: var(--muted);
  font-style: italic;
  max-width: 600px;
}

/* ============================================================
   AUTHORS
   ============================================================ */
.authors-section {
  background: var(--ink);
}
.authors-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.author-card {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 2rem;
  align-items: start;
  padding: 2rem;
  border: 1px solid rgba(123,104,238,.15);
  border-radius: 4px;
  background: rgba(61,30,124,.08);
  transition: border-color .3s, background .3s;
}
.author-card:hover {
  border-color: rgba(123,104,238,.4);
  background: rgba(61,30,124,.18);
}
.author-initials {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--deep), var(--violet));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--white);
  flex-shrink: 0;
  letter-spacing: .05em;
}
.author-info h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: .2rem;
}
.author-role {
  font-family: var(--font-mono);
  font-size: .65rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--violet);
  margin-bottom: .75rem;
}
.author-bio {
  font-size: .9rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 1rem;
}
.author-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}
.author-tags span {
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .08em;
  color: var(--accent);
  border: 1px solid rgba(196,181,253,.25);
  padding: .2rem .55rem;
  border-radius: 2px;
}

/* ============================================================
   IMPACT
   ============================================================ */
.impact-section {
  background: rgba(27,10,60,.5);
}
.impact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}
.impact-item {
  padding: 2.5rem 2rem;
  border: 1px solid rgba(123,104,238,.18);
  border-radius: 4px;
  background: rgba(61,30,124,.1);
  transition: border-color .3s, transform .3s;
}
.impact-item:hover {
  border-color: rgba(123,104,238,.45);
  transform: translateY(-3px);
}
.impact-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 1rem;
}
.impact-item h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: .6rem;
}
.impact-item p {
  font-size: .9rem;
  color: var(--muted);
  line-height: 1.7;
}

/* ============================================================
   CITATION
   ============================================================ */
.citation-section {
  background: var(--ink);
}
.citation-block {
  position: relative;
  border: 1px solid rgba(123,104,238,.25);
  border-radius: 4px;
  overflow: hidden;
}
.citation-code {
  padding: 2rem;
  overflow-x: auto;
  background: rgba(61,30,124,.12);
}
.citation-code code {
  font-family: var(--font-mono);
  font-size: .82rem;
  line-height: 1.8;
  color: var(--lavender);
  white-space: pre;
}
.copy-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-family: var(--font-mono);
  font-size: .65rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--violet);
  background: rgba(27,10,60,.8);
  border: 1px solid rgba(123,104,238,.4);
  padding: .4rem .9rem;
  border-radius: 2px;
  cursor: pointer;
  transition: background .2s, color .2s;
}
.copy-btn:hover {
  background: var(--violet);
  color: var(--white);
}
.copy-btn.copied {
  background: rgba(123,104,238,.3);
  color: var(--accent);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  padding: 2.5rem 2rem;
  border-top: 1px solid rgba(123,104,238,.15);
  background: rgba(27,10,60,.8);
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer p {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  color: rgba(155,142,196,.5);
}
.footer-links {
  display: flex;
  gap: 1.5rem;
}
.footer-links a {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  color: var(--muted);
  transition: color .2s;
}
.footer-links a:hover { color: var(--accent); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .contribution-grid { grid-template-columns: repeat(2, 1fr); }
  .abstract-grid { grid-template-columns: 1fr; }
  .abstract-sidebar { max-width: 480px; }
}

@media (max-width: 768px) {
  :root { --section-pad: 4rem 1.25rem; }
  .hero { padding: 7rem 1.25rem 4rem; }
  .hero-title { font-size: clamp(2.8rem, 12vw, 5rem); }
  .contribution-grid { grid-template-columns: 1fr; }
  .impact-grid { grid-template-columns: 1fr; }
  .perf-row { grid-template-columns: 140px 1fr 60px; }
  .author-card { grid-template-columns: 1fr; }
  .author-initials { width: 56px; height: 56px; font-size: 1.1rem; }
  .hero-stats { gap: 1rem; }
  .stat-card, .stat-num-large { min-width: 130px; padding: 1.2rem 1.4rem; }
  .nav-cta { display: none; }
}

@media (max-width: 480px) {
  .perf-row { grid-template-columns: 110px 1fr 55px; }
  .perf-model { font-size: .78rem; }
}