/* KnowRL article page — indigo_emerald_console palette */
:root {
  --bg: #0a1028;
  --bg-2: #121a3d;
  --bg-3: #1a2350;
  --surface: rgba(18, 26, 61, 0.72);
  --surface-2: rgba(26, 35, 80, 0.58);
  --surface-3: rgba(40, 50, 100, 0.45);
  --border: rgba(139, 124, 255, 0.22);
  --border-strong: rgba(139, 124, 255, 0.45);
  --primary: #34d399;
  --primary-2: #6ee7b7;
  --accent: #8b7cff;
  --accent-2: #a898ff;
  --text: #E6ECFF;
  --text-muted: #a5aecd;
  --text-dim: #7984a8;
  --warn: #ffb86b;
  --font-head: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --font-body: "Inter", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(139, 124, 255, 0.15), transparent 60%),
    radial-gradient(900px 500px at -10% 20%, rgba(52, 211, 153, 0.1), transparent 60%),
    linear-gradient(180deg, #0a1028 0%, #0d143a 50%, #0a1028 100%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .8s ease, transform .8s ease;
  will-change: opacity, transform;
}
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
}

/* Layout */
.article { max-width: 100%; overflow: hidden; }
.section { position: relative; padding: 72px 24px; }
.section-inner { max-width: 1120px; margin: 0 auto; }
.section-inner.narrow { max-width: 820px; }
.section:nth-child(even of .section) { background: rgba(139, 124, 255, 0.025); }

/* HERO */
.hero {
  position: relative;
  min-height: 90vh;
  padding: 120px 24px 100px;
  overflow: hidden;
  isolation: isolate;
  display: flex;
  align-items: center;
}
.hero-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center; background-repeat: no-repeat;
  opacity: 0.32; z-index: -2; filter: saturate(1.1);
}
.hero-overlay {
  position: absolute; inset: 0;
  background:
    radial-gradient(700px 400px at 30% 40%, rgba(139, 124, 255, 0.4), transparent 60%),
    radial-gradient(600px 350px at 80% 60%, rgba(52, 211, 153, 0.22), transparent 60%),
    linear-gradient(180deg, rgba(10, 16, 40, 0.55) 0%, rgba(10, 16, 40, 0.82) 80%);
  z-index: -1;
}
.hero-inner { max-width: 1020px; margin: 0 auto; width: 100%; }
.hero-chip {
  display: inline-block; padding: 6px 14px;
  border: 1px solid var(--border-strong);
  background: rgba(139, 124, 255, 0.12);
  color: var(--accent-2);
  font-family: var(--font-mono); font-size: 12px;
  letter-spacing: 0.14em; text-transform: uppercase;
  border-radius: 999px; margin-bottom: 24px;
}
.hero-title {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.12; letter-spacing: -0.01em;
  margin: 0 0 22px; color: #fff; font-weight: 700;
  text-wrap: balance;
}
.hero-authors {
  color: var(--text-muted); font-size: 0.95rem;
  margin: 0 0 24px; max-width: 820px;
}
.hero-lede {
  font-size: 1.18rem; line-height: 1.65;
  color: var(--text); margin: 0 0 36px; max-width: 820px;
}
.hero-actions {
  display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 48px;
}
.btn {
  display: inline-flex; align-items: center;
  padding: 12px 22px; border-radius: 10px;
  font-family: var(--font-head); font-weight: 600; font-size: 0.95rem;
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
  letter-spacing: 0.01em;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #0a1028;
  box-shadow: 0 4px 20px rgba(52, 211, 153, 0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(52, 211, 153, 0.55);
  text-decoration: none;
}
.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-strong);
  transform: translateY(-2px);
  text-decoration: none;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px; max-width: 780px;
}
.metric-chip {
  padding: 18px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  backdrop-filter: blur(8px);
}
.metric-num {
  font-family: var(--font-head); font-weight: 700;
  font-size: 1.75rem; color: var(--primary);
  line-height: 1;
}
.metric-label {
  margin-top: 6px; font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.04em; text-transform: uppercase;
}

/* Section chips & headings */
.section-chip {
  display: inline-block; padding: 5px 12px;
  border: 1px solid var(--border);
  background: rgba(139, 124, 255, 0.08);
  color: var(--accent-2);
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.18em; text-transform: uppercase;
  border-radius: 999px; margin-bottom: 16px;
}
.section-title {
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  line-height: 1.18; letter-spacing: -0.01em;
  margin: 0 0 32px; color: #fff; font-weight: 700;
  text-wrap: balance;
}

h3.h3-accent {
  font-family: var(--font-head);
  font-size: 1.25rem; color: var(--primary);
  margin: 40px 0 16px; font-weight: 600;
  letter-spacing: 0.005em;
}

p { margin: 0 0 18px; color: var(--text); }
p.lead { font-size: 1.12rem; color: var(--text); line-height: 1.7; }

.abstract-body p {
  font-size: 1.05rem; line-height: 1.8; color: var(--text);
}

.accent-bullets { list-style: none; padding: 0; margin: 0 0 24px; }
.accent-bullets li {
  position: relative;
  padding: 10px 0 10px 28px;
  border-bottom: 1px solid rgba(139, 124, 255, 0.1);
  color: var(--text);
}
.accent-bullets li::before {
  content: "▸";
  position: absolute; left: 0; top: 10px;
  color: var(--primary); font-size: 1.1rem;
}
.accent-bullets li:last-child { border-bottom: none; }

/* Card grids */
.card-grid { display: grid; gap: 20px; margin: 28px 0; }
.card-grid.two { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.card-grid.three { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.feature-card, .related-card, .gap-card, .stage-card {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  transition: transform .3s ease, border-color .3s ease;
}
.feature-card:hover, .related-card:hover, .gap-card:hover, .stage-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
}
.feature-card.wide { grid-column: 1 / -1; }
.feature-card h3, .related-card h3, .gap-card h3, .stage-card h3 {
  font-family: var(--font-head);
  font-size: 1.12rem; color: #fff;
  margin: 10px 0 12px; font-weight: 600;
}
.feature-card p, .related-card p, .gap-card p, .stage-card p {
  font-size: 0.98rem; color: var(--text-muted);
  margin: 0; line-height: 1.68;
}
.feature-badge {
  display: inline-block; padding: 4px 10px;
  background: rgba(52, 211, 153, 0.12);
  color: var(--primary);
  border: 1px solid rgba(52, 211, 153, 0.3);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem; letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.related-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem; color: var(--accent-2);
  letter-spacing: 0.12em; margin-bottom: 8px;
}
.gap-ribbon {
  display: inline-block; padding: 4px 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem; letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.gap-stack { display: grid; gap: 16px; margin: 28px 0; }
.stage-num {
  font-family: var(--font-head);
  font-size: 2rem; font-weight: 700;
  color: var(--primary);
  line-height: 1; margin-bottom: 10px;
}
.stage-card {
  background: linear-gradient(180deg, rgba(52, 211, 153, 0.08), rgba(22, 29, 66, 0.6));
  border: 1px solid rgba(52, 211, 153, 0.22);
}

/* Figures */
.figure-card {
  margin: 28px 0; padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  backdrop-filter: blur(10px);
}
.figure-card img {
  width: 100%; border-radius: 10px;
  background: #fff; padding: 16px;
}
.figure-card.inline { padding: 20px; }
.figure-card figcaption {
  margin-top: 16px;
  font-size: 0.9rem; color: var(--text-muted);
  line-height: 1.6;
  text-align: center;
  font-style: italic;
}

/* Metric hero row */
.metric-hero-row { margin: 24px 0 32px; }
.metric-hero {
  padding: 32px 24px;
  background: linear-gradient(165deg, rgba(139, 124, 255, 0.14), rgba(52, 211, 153, 0.05));
  border: 1px solid var(--border-strong);
  border-radius: 18px;
  text-align: center;
}
.metric-hero-num {
  font-family: var(--font-head); font-weight: 700;
  font-size: 3rem; line-height: 1;
  background: linear-gradient(135deg, var(--primary), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.metric-hero-label {
  margin-top: 10px; font-size: 0.95rem;
  color: var(--text); font-weight: 600;
}
.metric-delta {
  margin-top: 6px; font-size: 0.82rem;
  color: var(--text-muted);
}

/* Callout */
.callout {
  margin: 24px 0; padding: 24px 28px;
  background: rgba(52, 211, 153, 0.08);
  border: 1px solid rgba(52, 211, 153, 0.3);
  border-left: 4px solid var(--primary);
  border-radius: 12px;
}
.callout-label {
  font-family: var(--font-mono);
  font-size: 0.75rem; letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 8px; font-weight: 700;
}
.callout p { margin: 0; color: var(--text); font-size: 1rem; }

/* References */
.references details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 28px;
}
.references summary {
  cursor: pointer;
  font-family: var(--font-head);
  font-weight: 600; color: var(--accent-2);
  padding: 6px 0; list-style: none; user-select: none;
}
.references summary::-webkit-details-marker { display: none; }
.references summary::before {
  content: "▶ ";
  color: var(--primary);
  display: inline-block;
  transition: transform .2s ease;
  margin-right: 6px;
}
.references details[open] summary::before { transform: rotate(90deg); }
.references-list {
  margin: 20px 0 0;
  padding-left: 28px;
  color: var(--text-muted);
  font-size: 0.88rem; line-height: 1.7;
}
.references-list li { margin-bottom: 8px; padding-left: 4px; }

/* Footer */
.footer {
  margin-top: 40px; padding: 40px 24px 60px;
  border-top: 1px solid var(--border);
  background: rgba(10, 16, 40, 0.5);
}
.footer-inner {
  max-width: 1120px; margin: 0 auto;
  color: var(--text-dim);
  font-size: 0.85rem; text-align: center;
}

/* Flecto AI explanation UI classes */
.flecto-note, .flecto-callout, .flecto-card, .flecto-panel {
  position: relative;
  border-radius: 12px;
  backdrop-filter: blur(6px);
}
.flecto-note::before,
.flecto-callout::before,
.flecto-card::before,
.flecto-panel::before {
  content: "🤖 AI explanation";
  font-size: 0.7rem; font-weight: 700;
  text-transform: uppercase;
  color: #60a5fa;
  letter-spacing: 0.06em;
  display: block; margin-bottom: 0.5em;
}
.flecto-note {
  padding: 14px 18px; margin: 16px 0;
  background: rgba(96, 165, 250, 0.08);
  border-left: 3px solid #60a5fa;
  font-size: 0.94rem; color: var(--text);
}
.flecto-callout {
  padding: 20px 24px; margin: 20px 0;
  background: rgba(96, 165, 250, 0.1);
  border: 1px solid rgba(96, 165, 250, 0.3);
  color: var(--text);
}
.flecto-card {
  padding: 24px 28px; margin: 24px 0;
  background: var(--surface);
  border: 1px solid rgba(96, 165, 250, 0.22);
  box-shadow: 0 4px 18px rgba(10, 16, 40, 0.3);
}
.flecto-card h3, .flecto-card h4 {
  font-family: var(--font-head);
  font-size: 1.08rem; color: #fff; margin: 0 0 12px;
}
.flecto-card ul, .flecto-card ol {
  margin: 12px 0; padding-left: 24px;
  color: var(--text-muted);
}
.flecto-panel {
  padding: 28px 32px; margin: 28px 0;
  background: linear-gradient(165deg, rgba(96, 165, 250, 0.1), rgba(22, 29, 66, 0.65));
  border: 1px solid rgba(96, 165, 250, 0.3);
}
.flecto-panel h3 {
  font-family: var(--font-head);
  font-size: 1.2rem; color: #fff; margin: 0 0 14px;
}
.flecto-panel h4 {
  font-family: var(--font-head);
  font-size: 1rem; color: var(--primary);
  margin: 20px 0 8px;
}

/* Responsive */
@media (max-width: 720px) {
  .section { padding: 56px 18px; }
  .hero { padding: 90px 18px 70px; min-height: auto; }
  .hero-title { font-size: 2rem; }
  .hero-lede { font-size: 1.05rem; }
  .figure-card { padding: 16px; }
  .figure-card img { padding: 10px; }
  .metric-hero { padding: 24px 18px; }
  .metric-hero-num { font-size: 2.4rem; }
  .references details { padding: 16px 20px; }
}

/* KaTeX */
.katex { color: var(--text); }
.katex-display { margin: 20px 0; overflow-x: auto; overflow-y: hidden; }