:root {
  --bg: #ffffff;
  --bg-alt: #f6f8fb;
  --ink: #1a2233;
  --ink-soft: #54607a;
  --line: #e4e9f2;
  --brand: #2f7d5b;        /* orchard green */
  --brand-deep: #1f5c41;
  --brand-soft: #e8f3ee;
  --swe: #2f6df0;
  --gui: #b8530f;
  --claw: #7a3ff0;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(20,30,55,.06), 0 8px 28px rgba(20,30,55,.07);
  --shadow-lg: 0 12px 40px rgba(20,30,55,.12);
  --maxw: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand-deep); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre { font-family: 'JetBrains Mono', ui-monospace, monospace; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 860px; }

/* ---------------- HERO ---------------- */
.hero {
  background:
    radial-gradient(1200px 500px at 50% -120px, #eaf6ef 0%, rgba(234,246,239,0) 70%),
    linear-gradient(180deg, #fbfdfc 0%, #ffffff 100%);
  border-bottom: 1px solid var(--line);
  padding: 64px 0 52px;
  text-align: center;
}
.hero-badge {
  display: inline-block;
  font-size: 13px; font-weight: 600; letter-spacing: .04em;
  color: var(--brand-deep);
  background: var(--brand-soft);
  border: 1px solid #cfe7da;
  padding: 6px 14px; border-radius: 999px;
  margin-bottom: 22px;
}
.hero-title {
  font-size: clamp(56px, 11vw, 104px);
  line-height: .95;
  font-weight: 800;
  letter-spacing: -.03em;
  margin: 0;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 55%, #14402e 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-subtitle {
  font-size: clamp(18px, 3vw, 24px);
  font-weight: 500;
  color: var(--ink-soft);
  margin: 14px 0 30px;
}

.authors {
  list-style: none; padding: 0; margin: 0 auto 12px;
  display: flex; flex-wrap: wrap; justify-content: center; gap: 4px 18px;
  max-width: 720px;
}
.authors li { font-size: 16px; font-weight: 500; }
.authors li a { color: var(--ink); }
.affiliation { color: var(--ink-soft); font-size: 15px; margin: 6px 0 30px; }

.hero-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--ink); color: #fff;
  font-size: 15px; font-weight: 600;
  padding: 11px 20px; border-radius: 999px;
  border: 1px solid var(--ink);
  transition: transform .12s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow-lg); background: #2a3447; }
.btn-icon { font-size: 15px; }

/* ---------------- SECTIONS ---------------- */
.section { padding: 72px 0; }
.section-tight { padding: 44px 0; }
.section-alt { background: var(--bg-alt); border-block: 1px solid var(--line); }
.section-title {
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 800; letter-spacing: -.02em;
  text-align: center; margin: 0 0 14px;
}
.section-lead {
  text-align: center; color: var(--ink-soft);
  font-size: 17px; max-width: 760px; margin: 0 auto 44px;
}
.abstract { font-size: 17.5px; color: #2a3347; text-align: justify; }
.abstract strong { color: var(--brand-deep); }

/* ---------------- OVERVIEW FIGURE ---------------- */
/* capped to the text-column width so it doesn't dominate the page */
.overview-figure { margin: 0 auto; max-width: 100%; text-align: center; }
.overview-figure img {
  width: 100%; height: auto; display: block;
  border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-lg); background: #fff;
}
.overview-figure figcaption {
  margin: 18px auto 0; max-width: 780px;
  color: var(--ink-soft); font-size: 14.5px; line-height: 1.6;
}
.overview-figure figcaption strong { color: var(--ink); }

/* performance figure spans the full main-content width, so let its caption match */
.perf-figure figcaption { max-width: 100%; }

/* ---------------- STATS ---------------- */
.stat-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
}
.stat-card {
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px 20px; text-align: center;
  box-shadow: var(--shadow);
}
.stat-num {
  font-size: 44px; font-weight: 800; letter-spacing: -.03em;
  color: var(--brand-deep); line-height: 1;
}
.stat-num span { font-size: 24px; font-weight: 700; }
.stat-label { font-weight: 600; margin-top: 8px; font-size: 15px; }
.stat-sub { color: var(--ink-soft); font-size: 13px; margin-top: 2px; }

/* ---------------- ARCH DIAGRAM ---------------- */
.arch { max-width: 920px; margin: 0 auto; }
.arch-row { display: grid; gap: 16px; }
.arch-recipes { grid-template-columns: repeat(3, 1fr); }
.arch-backends { grid-template-columns: repeat(3, 1fr); }
.arch-card {
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow);
}
.arch-emoji { font-size: 30px; }
.arch-card.recipe h3 { margin: 8px 0 4px; font-size: 18px; }
.arch-card.recipe p { margin: 0 0 12px; color: var(--ink-soft); font-size: 14px; }
.arch-card.recipe.swe  { border-top: 3px solid var(--swe); }
.arch-card.recipe.gui  { border-top: 3px solid var(--gui); }
.arch-card.recipe.claw { border-top: 3px solid var(--claw); }
.arch-tag {
  font-size: 12px; font-weight: 600; color: var(--ink-soft);
  background: var(--bg-alt); border: 1px solid var(--line);
  padding: 4px 10px; border-radius: 999px;
}

.arch-connector {
  text-align: center; position: relative; margin: 14px 0;
}
.arch-connector span {
  display: inline-block; font-size: 13px; font-weight: 600; color: var(--ink-soft);
  background: var(--brand-soft); border: 1px solid #cfe7da;
  padding: 5px 14px; border-radius: 999px;
}
.arch-connector::before {
  content: ""; position: absolute; left: 50%; top: -14px; height: 14px; width: 2px;
  background: var(--line); transform: translateX(-50%);
}
.arch-connector::after {
  content: ""; position: absolute; left: 50%; bottom: -14px; height: 14px; width: 2px;
  background: var(--line); transform: translateX(-50%);
}

.arch-card.env {
  background: linear-gradient(180deg, #f3faf6 0%, #ffffff 100%);
  border: 1.5px solid #bfe1cf; padding: 26px;
}
.env-head { text-align: center; }
.env-head h3 { margin: 6px 0 4px; font-size: 22px; color: var(--brand-deep); }
.env-tagline { margin: 0 auto; color: var(--ink-soft); max-width: 560px; font-size: 15px; }
.env-prims {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 18px;
}
.env-prims span {
  font-size: 13px; font-weight: 600; color: var(--brand-deep);
  background: var(--brand-soft); border: 1px solid #cfe7da;
  padding: 6px 12px; border-radius: 8px;
}
.arch-card.backend strong { display: block; margin-bottom: 4px; }
.arch-card.backend p { margin: 0; color: var(--ink-soft); font-size: 14px; }

/* ---------------- RECIPE DETAILS ---------------- */
.recipe-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.recipe-detail {
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow);
  display: flex; flex-direction: column;
}
.recipe-detail header { margin-bottom: 12px; }
.recipe-detail h3 { margin: 10px 0 0; font-size: 20px; }
.recipe-detail p { color: #38425a; font-size: 15px; }
.recipe-detail .note {
  margin-top: auto; padding-top: 12px; color: var(--brand-deep);
  font-size: 13.5px; font-weight: 600;
}
.recipe-chip {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .03em;
  padding: 4px 11px; border-radius: 999px; color: #fff;
}
.recipe-chip.swe  { background: var(--swe); }
.recipe-chip.gui  { background: var(--gui); }
.recipe-chip.claw { background: var(--claw); }

.kv { list-style: none; padding: 0; margin: 14px 0; border-top: 1px solid var(--line); }
.kv li {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 9px 0; border-bottom: 1px solid var(--line); font-size: 14.5px;
}
.kv li span { color: var(--ink-soft); }
.kv li strong { font-size: 16px; }

/* ---------------- METHODS ---------------- */
.method-list { display: flex; flex-direction: column; gap: 20px; }
.method {
  display: flex; gap: 22px; align-items: flex-start;
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px 26px; box-shadow: var(--shadow);
}
.method-num {
  font-size: 26px; font-weight: 800; color: var(--brand);
  flex: 0 0 auto; opacity: .55; letter-spacing: -.02em;
}
.method h3 { margin: 0 0 6px; font-size: 18px; }
.method p { margin: 0; color: #38425a; font-size: 15px; }

/* ---------------- ENV GRID + CODE ---------------- */
.env-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-bottom: 40px;
}
.env-feature {
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow);
}
.env-feature h4 { margin: 0 0 6px; font-size: 16px; color: var(--brand-deep); }
.env-feature p { margin: 0; color: var(--ink-soft); font-size: 14px; }

.code-block {
  background: #0f1626; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow-lg); border: 1px solid #1c2740;
}
.code-head {
  display: flex; align-items: center; gap: 8px;
  background: #161f33; padding: 12px 16px; border-bottom: 1px solid #1c2740;
}
.dot { width: 12px; height: 12px; border-radius: 50%; display: inline-block; }
.dot.red { background: #ff5f57; } .dot.yellow { background: #febc2e; } .dot.green { background: #28c840; }
.code-title { color: #8a97b3; font-size: 13px; margin-left: 6px; font-family: 'JetBrains Mono', monospace; }
.copy-btn {
  margin-left: auto; background: #243049; color: #cdd7ec; border: 1px solid #33415f;
  font-size: 12px; font-weight: 600; padding: 5px 12px; border-radius: 7px; cursor: pointer;
  font-family: 'Inter', sans-serif; transition: background .15s ease;
}
.copy-btn:hover { background: #2e3c5b; }
.code-block pre { margin: 0; padding: 20px 22px; overflow-x: auto; }
.code-block code { color: #d7deec; font-size: 13.5px; line-height: 1.7; }
.code-block .c  { color: #6b7a99; font-style: italic; }
.code-block .k  { color: #c792ea; }
.code-block .s  { color: #c3e88d; }
.code-block .n  { color: #f78c6c; }
.code-block .nb { color: #82aaff; }

/* ---------------- RESULTS TABLE ---------------- */
.table-wrap { overflow-x: auto; }
.results {
  width: 100%; border-collapse: collapse; background: var(--bg);
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow);
}
.results th, .results td {
  padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--line);
  font-size: 15px; vertical-align: middle;
}
.results thead th {
  background: var(--bg-alt); font-size: 13px; text-transform: uppercase;
  letter-spacing: .04em; color: var(--ink-soft);
}
.results td.num { text-align: right; font-weight: 700; font-variant-numeric: tabular-nums; }
.results td.num.best { color: var(--brand-deep); }
.results em { color: var(--ink-soft); font-style: normal; font-size: 13px; }
.results tbody tr:last-child td { border-bottom: none; }

.note { color: var(--ink-soft); font-size: 14px; }
.note.centered { text-align: center; margin-top: 18px; }

/* ---------------- FOOTER ---------------- */
.footer {
  background: #0f1626; color: #aab6d0; text-align: center;
  padding: 40px 0; font-size: 14px;
}
.footer a { color: #9fd9bd; }
.footer-fine { color: #66718f; margin-top: 6px; font-size: 13px; }

/* ---------------- RESPONSIVE ---------------- */
@media (max-width: 880px) {
  .stat-grid, .arch-recipes, .arch-backends, .recipe-grid, .env-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .section { padding: 52px 0; }
  .stat-grid, .arch-recipes, .arch-backends, .recipe-grid, .env-grid { grid-template-columns: 1fr; }
  .method { flex-direction: column; gap: 8px; }
  .abstract { text-align: left; }
}