:root {
  --ink: #e9f3ff;
  --muted: #92a8be;
  --bg: #07111f;
  --panel: #0c1a2b;
  --panel-2: #102238;
  --line: rgba(159, 190, 219, 0.16);
  --cyan: #58e1d5;
  --blue: #70a7ff;
  --violet: #ae8cff;
  --warm: #ffc46b;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: radial-gradient(circle at 84% 0%, rgba(88, 225, 213, .11), transparent 28rem), radial-gradient(circle at 8% 20%, rgba(112, 167, 255, .10), transparent 32rem), var(--bg); }
a { color: inherit; }
button, input, select { font: inherit; }

.topbar { position: sticky; top: 0; z-index: 20; display: flex; justify-content: space-between; align-items: center; padding: 1rem max(4vw, 1.25rem); background: rgba(7, 17, 31, .82); border-bottom: 1px solid var(--line); backdrop-filter: blur(18px); }
.brand { display: flex; gap: .65rem; align-items: center; text-decoration: none; font-weight: 760; letter-spacing: -.02em; }
.brand-mark { display: grid; width: 2.1rem; height: 2.1rem; place-items: center; color: #041318; background: linear-gradient(135deg, var(--cyan), var(--blue)); border-radius: .7rem; font-size: .74rem; letter-spacing: .04em; }
nav { display: flex; gap: 1.45rem; align-items: center; }
nav a { color: var(--muted); text-decoration: none; font-size: .9rem; }
nav a:hover { color: var(--ink); }
.github-link { padding: .55rem .85rem; border: 1px solid var(--line); border-radius: .7rem; }

main { overflow: hidden; }
.hero, .explore, .coverage, .principles { width: min(1180px, calc(100% - 2.5rem)); margin-inline: auto; }
.hero { display: grid; grid-template-columns: 1.15fr .85fr; gap: 4rem; align-items: center; min-height: 650px; padding: 7rem 0 5rem; }
.eyebrow { margin: 0 0 .9rem; color: var(--cyan); font-size: .76rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
h1 { margin: 0; max-width: 820px; font-size: clamp(2.8rem, 6vw, 5.8rem); line-height: .98; letter-spacing: -.065em; }
h1 em { color: var(--cyan); font-family: Georgia, serif; font-weight: 500; }
.lede { max-width: 720px; margin: 1.7rem 0 0; color: #b8cadd; font-size: clamp(1.05rem, 1.8vw, 1.35rem); line-height: 1.6; }
.hero-actions { display: flex; gap: .8rem; margin-top: 2rem; }
.button { display: inline-flex; align-items: center; min-height: 3rem; padding: .75rem 1.1rem; border-radius: .8rem; text-decoration: none; font-weight: 720; }
.button.primary { color: #031616; background: var(--cyan); }
.button.secondary { color: var(--ink); border: 1px solid var(--line); background: rgba(255,255,255,.025); }
.scope-note { margin-top: 1.2rem; color: #6f879f; font-size: .83rem; }

.lifecycle { position: relative; display: grid; gap: .8rem; }
.lifecycle::before { position: absolute; top: 2rem; bottom: 2rem; left: 1.45rem; width: 1px; content: ""; background: linear-gradient(var(--cyan), var(--violet)); opacity: .65; }
.lifecycle div { position: relative; display: grid; grid-template-columns: 3rem 1fr; grid-template-rows: auto auto; padding: 1rem 1.1rem; border: 1px solid var(--line); border-radius: 1rem; background: rgba(12,26,43,.76); box-shadow: var(--shadow); }
.lifecycle span { z-index: 1; grid-row: 1 / 3; align-self: center; color: var(--cyan); font: 700 .75rem ui-monospace, monospace; }
.lifecycle strong { font-size: 1rem; }
.lifecycle small { margin-top: .25rem; color: var(--muted); }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); border-block: 1px solid var(--line); background: rgba(12, 26, 43, .6); }
.stats article { padding: 2.1rem 1rem; text-align: center; border-right: 1px solid var(--line); }
.stats article:last-child { border: 0; }
.stats strong { display: block; color: var(--cyan); font-size: 2.25rem; letter-spacing: -.04em; }
.stats span { color: var(--muted); font-size: .83rem; text-transform: uppercase; letter-spacing: .08em; }

.explore, .coverage, .principles { padding: 6rem 0; }
.section-heading { display: flex; justify-content: space-between; gap: 2rem; align-items: end; margin-bottom: 2rem; }
h2 { margin: 0; max-width: 760px; font-size: clamp(2rem, 4vw, 3.4rem); line-height: 1.06; letter-spacing: -.045em; }
.text-button, .text-link { padding: .6rem 0; color: var(--cyan); border: 0; background: none; text-decoration: none; cursor: pointer; white-space: nowrap; }

.filters { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .8rem; padding: 1rem; border: 1px solid var(--line); border-radius: 1.15rem; background: var(--panel); }
.search-field { grid-column: span 2; }
.filters label { display: grid; gap: .4rem; color: var(--muted); font-size: .72rem; font-weight: 750; letter-spacing: .05em; text-transform: uppercase; }
.filters input, .filters select { width: 100%; min-width: 0; height: 2.7rem; padding: 0 .75rem; color: var(--ink); border: 1px solid var(--line); border-radius: .65rem; outline: none; background: #081522; }
.filters input:focus, .filters select:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(88,225,213,.1); }
.result-meta { display: flex; justify-content: space-between; min-height: 3.5rem; padding: 1.25rem .25rem .8rem; color: var(--muted); }
.result-meta strong { color: var(--ink); }
.paper-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.paper-card { display: flex; flex-direction: column; min-height: 280px; padding: 1.35rem; border: 1px solid var(--line); border-radius: 1rem; background: linear-gradient(145deg, rgba(16,34,56,.9), rgba(9,22,36,.92)); transition: transform .18s ease, border-color .18s ease; }
.paper-card:hover { transform: translateY(-2px); border-color: rgba(88,225,213,.45); }
.paper-top { display: flex; justify-content: space-between; gap: .8rem; color: var(--muted); font-size: .78rem; }
.paper-card h3 { margin: .75rem 0 .55rem; font-size: 1.22rem; line-height: 1.28; letter-spacing: -.02em; }
.paper-card h3 a { text-decoration: none; }
.paper-card h3 a:hover { color: var(--cyan); }
.authors { margin: 0 0 1rem; color: var(--muted); font-size: .84rem; line-height: 1.45; }
.tags { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: 1rem; }
.tag { padding: .28rem .48rem; color: #bbd4ea; border: 1px solid var(--line); border-radius: .45rem; background: rgba(112,167,255,.06); font: 600 .68rem ui-monospace, monospace; }
.evidence { margin: auto 0 0; padding-top: 1rem; color: #9fb4c7; border-top: 1px solid var(--line); font-size: .8rem; line-height: 1.45; }
.card-links { display: flex; gap: .8rem; margin-top: .8rem; }
.card-links a { color: var(--cyan); font-size: .8rem; text-decoration: none; }
.status { padding: .24rem .45rem; border-radius: 99px; font-size: .66rem; font-weight: 800; letter-spacing: .03em; }
.status.metadata_verified { color: #b8cadd; background: rgba(184,202,221,.1); }
.status.full_text_screened { color: var(--warm); background: rgba(255,196,107,.1); }
.status.full_text_coded, .status.second_pass_verified { color: var(--cyan); background: rgba(88,225,213,.1); }
.empty { padding: 3rem; text-align: center; color: var(--muted); }
.empty button { color: var(--cyan); border: 0; background: none; cursor: pointer; }

.coverage { width: min(1240px, calc(100% - 2.5rem)); }
.coverage-warning { max-width: 760px; margin: -1rem 0 2.2rem; color: var(--muted); }
.coverage-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.coverage-grid article { padding: 1.35rem; border: 1px solid var(--line); border-radius: 1rem; background: var(--panel); }
.coverage-grid h3 { margin: 0 0 1.2rem; }
.bar-row { display: grid; grid-template-columns: minmax(9rem, 1fr) 3fr 2.4rem; gap: .7rem; align-items: center; margin: .7rem 0; font-size: .75rem; }
.bar-label { color: #bad0e4; overflow: hidden; text-overflow: ellipsis; }
.bar-track { height: .45rem; overflow: hidden; border-radius: 99px; background: rgba(255,255,255,.06); }
.bar-fill { height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--blue), var(--cyan)); }
.bar-count { color: var(--muted); text-align: right; font-variant-numeric: tabular-nums; }

.principles { border-top: 1px solid var(--line); }
.principle-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-top: 2.2rem; }
.principle-grid article { padding: 1.25rem; border-left: 1px solid var(--line); }
.principle-grid span { color: var(--violet); font: 700 .72rem ui-monospace, monospace; }
.principle-grid h3 { margin: .7rem 0; }
.principle-grid p { margin: 0; color: var(--muted); line-height: 1.55; font-size: .9rem; }

footer { display: flex; justify-content: space-between; gap: 2rem; padding: 3rem max(4vw, 1.25rem); border-top: 1px solid var(--line); background: #050d17; }
footer p { color: var(--muted); }
footer > div:last-child { display: flex; gap: 1.2rem; }
footer a { color: var(--muted); text-decoration: none; }

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; }
  .lifecycle { grid-template-columns: repeat(5, 1fr); }
  .lifecycle::before { display: none; }
  .lifecycle div { display: flex; flex-direction: column; }
  .filters { grid-template-columns: repeat(3, 1fr); }
  .search-field { grid-column: span 3; }
  .principle-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 680px) {
  nav a:not(.github-link) { display: none; }
  .hero { min-height: auto; padding-top: 4.5rem; }
  .lifecycle { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats article:nth-child(2) { border-right: 0; }
  .stats article:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .section-heading { display: block; }
  .filters { grid-template-columns: 1fr; }
  .search-field { grid-column: auto; }
  .paper-grid, .coverage-grid, .principle-grid { grid-template-columns: 1fr; }
  .result-meta { display: block; }
  .lifecycle div { box-shadow: none; }
  footer { display: block; }
}