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

:root {
  --clr-pm:       #2563eb;   /* Perlmutter blue */
  --clr-pm-light: #dbeafe;
  --clr-fr:       #16a34a;   /* Frontier green */
  --clr-fr-light: #dcfce7;
  --clr-hpc:      #7c3aed;
  --clr-ai:       #ea580c;
  --clr-accent:   #0f172a;
  --clr-bg:       #f8fafc;
  --clr-alt:      #f1f5f9;
  --clr-border:   #e2e8f0;
  --clr-text:     #1e293b;
  --clr-muted:    #64748b;
  --radius:       0.75rem;
  --shadow-sm:    0 1px 3px rgba(0,0,0,.08);
  --shadow-md:    0 4px 16px rgba(0,0,0,.10);
  --shadow-lg:    0 8px 32px rgba(0,0,0,.14);
  --max-w:        1100px;
  --font:         'Segoe UI', system-ui, -apple-system, sans-serif;
  --mono:         'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  color: var(--clr-text);
  background: var(--clr-bg);
  line-height: 1.65;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

a { color: var(--clr-pm); text-decoration: none; }
a:hover { text-decoration: underline; }
code {
  font-family: var(--mono);
  font-size: .85em;
  background: #e8edf2;
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

/* ===================================================
   Hero
=================================================== */
.hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 60%, #0f2d4a 100%);
  color: #fff;
  padding: 4.5rem 0 3.5rem;
  text-align: center;
}

.hero-inner { display: flex; flex-direction: column; align-items: center; gap: 1.5rem; }

.venue-badge {
  display: inline-block;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.3);
  color: #93c5fd;
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: .35rem .9rem;
  border-radius: 99px;
}

.title {
  font-size: clamp(1.5rem, 3vw, 2.3rem);
  font-weight: 700;
  line-height: 1.3;
  max-width: 860px;
  color: #f0f9ff;
}

.authors {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.author-card {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: var(--radius);
  padding: .8rem 1.3rem;
  text-align: center;
  min-width: 180px;
}

.author-name  { font-weight: 700; font-size: 1rem; color: #e0f2fe; }
.author-info  { font-size: .83rem; color: #94a3b8; margin-top: .15rem; }
.author-email { font-size: .78rem; color: #60a5fa; margin-top: .2rem; }

.hero-links { display: flex; gap: .9rem; flex-wrap: wrap; justify-content: center; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .6rem 1.4rem;
  border-radius: 99px;
  font-weight: 600;
  font-size: .9rem;
  cursor: pointer;
  transition: all .2s;
  border: none;
}
.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

.btn-primary  { background: #2563eb; color: #fff; }
.btn-primary:hover  { background: #1d4ed8; text-decoration: none; }
.btn-secondary { background: rgba(255,255,255,.12); color: #e2e8f0; border: 1px solid rgba(255,255,255,.25); }
.btn-secondary:hover { background: rgba(255,255,255,.22); color: #fff; text-decoration: none; }

.keyword-row { display: flex; flex-wrap: wrap; gap: .5rem; justify-content: center; }
.kw {
  background: rgba(255,255,255,.1);
  color: #bae6fd;
  font-size: .78rem;
  padding: .28rem .75rem;
  border-radius: 99px;
  border: 1px solid rgba(255,255,255,.15);
}

/* ===================================================
   Sticky Nav
=================================================== */
.sticky-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15,23,42,.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.nav-inner {
  display: flex;
  gap: .1rem;
  overflow-x: auto;
  padding: .5rem 1.5rem;
  scrollbar-width: none;
}
.nav-inner::-webkit-scrollbar { display: none; }

.sticky-nav a {
  color: #94a3b8;
  font-size: .82rem;
  font-weight: 500;
  white-space: nowrap;
  padding: .35rem .7rem;
  border-radius: 6px;
  transition: all .15s;
}
.sticky-nav a:hover, .sticky-nav a.active {
  color: #60a5fa;
  background: rgba(96,165,250,.1);
  text-decoration: none;
}

/* ===================================================
   Sections
=================================================== */
.section     { padding: 4rem 0; }
.section-alt { background: var(--clr-alt); }

.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--clr-accent);
  margin-bottom: 1rem;
  position: relative;
  display: inline-block;
}
.section-title::after {
  content: '';
  display: block;
  width: 3rem;
  height: 3px;
  background: var(--clr-pm);
  margin-top: .35rem;
  border-radius: 2px;
}

.section-subtitle {
  color: var(--clr-muted);
  font-size: 1rem;
  margin-bottom: 2rem;
  max-width: 680px;
}

.subsection-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  color: var(--clr-accent);
}

/* ===================================================
   Abstract
=================================================== */
.abstract-text {
  font-size: 1.05rem;
  line-height: 1.8;
  max-width: 820px;
  margin-bottom: .85rem;
  color: #334155;
}

/* ===================================================
   Contributions
=================================================== */
.contrib-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.contrib-card {
  background: #fff;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s, transform .2s;
}
.contrib-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.contrib-icon { font-size: 2rem; margin-bottom: .6rem; }
.contrib-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: .6rem; color: var(--clr-accent); }
.contrib-card p  { font-size: .88rem; color: #475569; }

/* ===================================================
   Study Design / Systems
=================================================== */
.systems-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}
@media (max-width: 700px) { .systems-grid { grid-template-columns: 1fr; } }

.system-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 1.5rem;
  border: 2px solid transparent;
  box-shadow: var(--shadow-sm);
}
.perlmutter { border-color: var(--clr-pm); }
.frontier   { border-color: var(--clr-fr); }

.system-logo-row {
  display: flex;
  align-items: baseline;
  gap: .75rem;
  margin-bottom: 1rem;
}
.system-name { font-size: 1.3rem; font-weight: 800; color: var(--clr-accent); }
.perlmutter .system-lab { font-size: .8rem; font-weight: 600; color: var(--clr-pm); background: var(--clr-pm-light); padding: .2rem .6rem; border-radius: 99px; }
.frontier   .system-lab { font-size: .8rem; font-weight: 600; color: var(--clr-fr); background: var(--clr-fr-light); padding: .2rem .6rem; border-radius: 99px; }

.system-spec-grid { display: flex; flex-direction: column; gap: .45rem; }
.spec-item { display: flex; gap: .5rem; font-size: .85rem; }
.spec-label { font-weight: 600; color: var(--clr-muted); min-width: 70px; flex-shrink: 0; }
.spec-val   { color: var(--clr-text); }

/* Apps */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}
.app-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 1.25rem;
  border-top: 4px solid transparent;
  box-shadow: var(--shadow-sm);
}
.hpc-app { border-top-color: var(--clr-hpc); }
.ai-app  { border-top-color: var(--clr-ai); }

.app-badge {
  display: inline-block;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .08em;
  padding: .2rem .55rem;
  border-radius: 99px;
  background: #ede9fe;
  color: var(--clr-hpc);
  margin-bottom: .6rem;
}
.ai-badge { background: #ffedd5; color: var(--clr-ai); }

.app-name { font-size: 1.1rem; font-weight: 700; color: var(--clr-accent); margin-bottom: .4rem; }
.app-card p { font-size: .83rem; color: #475569; margin-bottom: .6rem; }
.app-comm { font-size: .78rem; font-family: var(--mono); color: var(--clr-muted); background: #f8fafc; padding: .3rem .55rem; border-radius: 4px; }

/* ===================================================
   Key Findings
=================================================== */
.finding-block {
  background: #fff;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 1.75rem;
  box-shadow: var(--shadow-sm);
}
.finding-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--clr-accent);
  margin-bottom: .75rem;
}
.finding-block > p { color: #475569; margin-bottom: 1.25rem; }

.takeaway-box {
  background: #f0f9ff;
  border-left: 4px solid var(--clr-pm);
  padding: .9rem 1.1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: .9rem;
  color: #0f172a;
  margin-top: 1.25rem;
}

/* Variability bars */
.variability-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
}
@media (max-width: 640px) { .variability-stats { grid-template-columns: 1fr; } }

.var-system-name { font-weight: 700; font-size: .95rem; margin-bottom: .7rem; }
.perlmutter-color { color: var(--clr-pm); }
.frontier-color   { color: var(--clr-fr); }

.var-bars { display: flex; flex-direction: column; gap: .55rem; }
.var-row { display: flex; align-items: center; gap: .75rem; font-size: .83rem; }
.var-app { min-width: 72px; font-weight: 600; color: var(--clr-muted); }
.var-bar-wrap { flex: 1; background: #f1f5f9; border-radius: 99px; overflow: hidden; height: 22px; }
.var-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--clr-pm), #60a5fa);
  border-radius: 99px;
  display: flex;
  align-items: center;
  padding: 0 .5rem;
  font-size: .72rem;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
}
.frontier-bar { background: linear-gradient(90deg, var(--clr-fr), #4ade80); }

/* Comm findings */
.comm-findings {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}
.comm-card {
  background: #fafafa;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 1rem;
}
.comm-app  { font-weight: 700; font-size: .9rem; color: var(--clr-accent); margin-bottom: .35rem; }
.comm-stat { font-size: .88rem; color: #334155; margin-bottom: .35rem; }
.comm-num  { font-size: 1.15rem; font-weight: 800; color: var(--clr-pm); display: block; }
.comm-detail { font-size: .8rem; color: var(--clr-muted); }

/* ===================================================
   GEMM Section (Tabs)
=================================================== */
.tab-container { margin-top: 1.5rem; }

.tab-buttons {
  display: flex;
  gap: .5rem;
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--clr-border);
  padding-bottom: .5rem;
}
.tab-btn {
  padding: .45rem 1.1rem;
  border: none;
  background: transparent;
  border-radius: var(--radius) var(--radius) 0 0;
  font-size: .88rem;
  font-weight: 600;
  color: var(--clr-muted);
  cursor: pointer;
  transition: all .15s;
}
.tab-btn.active, .tab-btn:hover {
  color: var(--clr-pm);
  background: var(--clr-pm-light);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

.gemm-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}
.gemm-fig {
  background: #fff;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.gemm-fig img {
  width: 100%;
  height: auto;
  border-radius: 4px;
  margin-bottom: .6rem;
}
.fig-caption { font-size: .8rem; color: var(--clr-muted); line-height: 1.4; }

/* ===================================================
   ML Section
=================================================== */
.ml-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  margin-top: 1.5rem;
}
@media (max-width: 800px) { .ml-two-col { grid-template-columns: 1fr; } }

.ml-left h3, .ml-right h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--clr-accent);
  margin-bottom: .75rem;
}
.ml-left p, .ml-right p { font-size: .9rem; color: #475569; margin-bottom: 1rem; }

.feature-table { background: #fff; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--clr-border); }
.feat-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  padding: .55rem 1rem;
  font-size: .83rem;
  border-bottom: 1px solid var(--clr-border);
  align-items: center;
}
.feat-row:last-child { border-bottom: none; }
.header-row { background: #f1f5f9; font-weight: 700; font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; color: var(--clr-muted); }
.highlight-row { background: #f0f9ff; font-weight: 600; color: #0f172a; }
.feat-count { font-weight: 700; color: var(--clr-pm); font-variant-numeric: tabular-nums; }

.nic-list { display: flex; flex-direction: column; gap: .85rem; margin-top: .5rem; }
.nic-item { background: #fff; border: 1px solid var(--clr-border); border-radius: var(--radius); padding: .75rem 1rem; }
.nic-name { font-weight: 600; margin-bottom: .3rem; }
.nic-item p { font-size: .82rem; color: var(--clr-muted); margin: 0; }

.ml-result-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1.25rem; }
.ml-result {
  background: #fff;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 1.1rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.ml-metric { font-size: .78rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--clr-muted); margin-bottom: .35rem; }
.ml-value  { font-size: 1.7rem; font-weight: 800; color: var(--clr-pm); margin-bottom: .3rem; }
.ml-desc   { font-size: .78rem; color: var(--clr-muted); line-height: 1.4; }

.ml-insight-box {
  background: #fff;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  margin-bottom: 1rem;
}
.ml-insight-box h4 { font-size: .9rem; font-weight: 700; color: var(--clr-accent); margin-bottom: .4rem; }
.ml-insight-box p  { font-size: .85rem; color: #475569; margin: 0; }

/* ===================================================
   Implications
=================================================== */
.insights-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}
@media (max-width: 760px) { .insights-grid { grid-template-columns: 1fr; } }

.insight-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 1.75rem;
  border-top: 5px solid transparent;
  box-shadow: var(--shadow-sm);
}
.admin-card { border-top-color: #7c3aed; }
.user-card  { border-top-color: var(--clr-fr); }

.insight-icon { font-size: 2rem; margin-bottom: .6rem; }
.insight-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 1rem; color: var(--clr-accent); }

.insight-list { list-style: none; display: flex; flex-direction: column; gap: .9rem; padding: 0; }
.insight-list li {
  font-size: .88rem;
  color: #334155;
  padding-left: 1.2rem;
  position: relative;
}
.insight-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--clr-pm);
  font-weight: 700;
}
.insight-list strong { color: var(--clr-accent); }

/* ===================================================
   BibTeX
=================================================== */
.bibtex-wrap {
  position: relative;
  margin-top: 1.25rem;
  max-width: 700px;
}
.bibtex-block {
  background: #0f172a;
  color: #93c5fd;
  font-family: var(--mono);
  font-size: .85rem;
  line-height: 1.7;
  padding: 1.5rem;
  border-radius: var(--radius);
  overflow-x: auto;
  white-space: pre;
}
.copy-btn {
  position: absolute;
  top: .75rem;
  right: .75rem;
  background: rgba(255,255,255,.1);
  color: #e2e8f0;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 6px;
  padding: .3rem .75rem;
  font-size: .78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
}
.copy-btn:hover { background: rgba(255,255,255,.2); }

/* ===================================================
   Footer
=================================================== */
.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 2.5rem 0;
  text-align: center;
}
.footer-affil { margin-bottom: .75rem; }
.umd-badge { display: inline-flex; flex-direction: column; gap: .2rem; }
.umd-text { font-size: 1rem; font-weight: 700; color: #e2e8f0; }
.umd-sub  { font-size: .82rem; color: #64748b; }
.footer-note { font-size: .85rem; }
.footer a { color: #60a5fa; }

/* ===================================================
   Figure layouts (new)
=================================================== */
.full-fig {
  background: #fff;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  text-align: center;
}
.full-fig img { width: 100%; height: auto; border-radius: 4px; margin-bottom: .6rem; }

.fig-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}
.fig-row-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
@media (max-width: 900px) { .fig-row-4 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .fig-row-2, .fig-row-4 { grid-template-columns: 1fr; } }

.panel-fig {
  background: #fff;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.panel-fig img { width: 100%; height: auto; border-radius: 4px; margin-bottom: .6rem; }

/* Auto-generated badge */
.autogen-badge {
  position: fixed;
  top: 0.75rem;
  right: 1rem;
  z-index: 200;
  background: rgba(15,23,42,0.82);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 99px;
  padding: .3rem .75rem;
  font-size: .72rem;
  color: #94a3b8;
  display: flex;
  align-items: center;
  gap: .35rem;
  white-space: nowrap;
}
.autogen-badge svg { width: 13px; height: 13px; opacity: .7; flex-shrink: 0; }
.autogen-badge a { color: #60a5fa; text-decoration: none; }
.autogen-badge a:hover { text-decoration: underline; }

/* ===================================================
   Responsive
=================================================== */
@media (max-width: 600px) {
  .section { padding: 2.5rem 0; }
  .section-title { font-size: 1.4rem; }
  .title { font-size: 1.35rem; }
  .hero { padding: 3rem 0 2.5rem; }
  .contrib-grid, .app-grid, .comm-findings { grid-template-columns: 1fr; }
}