:root {
  --ink: #07141c;
  --ink-2: #0c2230;
  --paper: #e8f4f8;
  --muted: #8aafbd;
  --teal: #0a6e8f;
  --teal-deep: #1565a8;
  --cyan: #3ec4e6;
  --cyan-2: #7eddf4;
  --gold: #e8a317;
  --line: rgba(126, 221, 244, 0.14);
  --radius: 22px;
  --font: "Outfit", system-ui, sans-serif;
  --display: "Fraunces", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--paper);
  background: var(--ink);
  line-height: 1.55;
  overflow-x: hidden;
}

.noise {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 0;
  opacity: 0.09;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.orb {
  pointer-events: none;
  position: fixed;
  z-index: 0;
  border-radius: 50%;
  filter: blur(80px);
}

.orb-a {
  width: 42vw;
  height: 42vw;
  top: -12vw;
  right: -8vw;
  background: radial-gradient(circle, rgba(62, 196, 230, 0.28), transparent 70%);
}

.orb-b {
  width: 36vw;
  height: 36vw;
  bottom: 10vh;
  left: -12vw;
  background: radial-gradient(circle, rgba(232, 163, 23, 0.12), transparent 70%);
}

.nav, main, .foot {
  position: relative;
  z-index: 1;
}

.nav {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.85rem 6vw;
  background: rgba(7, 20, 28, 0.78);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  z-index: 5;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: inherit;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand img { border-radius: 9px; }

.nav-links {
  display: flex;
  gap: 1.25rem;
  margin-left: auto;
  font-size: 0.92rem;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
}

.nav-links a:hover { color: var(--cyan-2); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.15rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease;
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: linear-gradient(180deg, var(--cyan), #1aa8ce);
  color: #04202a;
}

.btn-secondary, .btn-ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--line);
}

.btn-ghost { padding: 0.45rem 0.95rem; }

.hero {
  padding: 5.5rem clamp(1.15rem, 6vw, 6rem) 4rem;
  max-width: 1280px;
  margin: 0 auto;
}

.eyebrow {
  color: var(--cyan);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.75rem;
  font-weight: 600;
  margin: 0 0 1.2rem;
}

h1, h2, h3 { font-family: var(--display); font-weight: 500; letter-spacing: -0.03em; }

h1 {
  font-size: clamp(1.85rem, 6vw, 5.1rem);
  line-height: 1.08;
  margin: 0 0 1.2rem;
  padding-right: 0.12em;
  overflow-wrap: break-word;
}

h1 em {
  display: block;
  font-style: italic;
  color: var(--cyan-2);
  padding-right: 0.12em;
}

.lead {
  max-width: 38rem;
  font-size: 1.15rem;
  color: #c5dbe4;
  margin: 0 0 1.15rem;
  overflow-wrap: break-word;
}

.topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  max-width: 40rem;
  margin: 0 0 1.8rem;
  padding: 0;
  list-style: none;
}

.topics li {
  margin: 0;
  padding: 0.28rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.01em;
}

@media (max-width: 600px) {
  .lead { font-size: 1.02rem; }
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin: 3rem 0 3.5rem;
  padding: 0;
}

.hero-stats div {
  margin: 0;
  padding-right: 1rem;
  border-right: 1px solid var(--line);
}

.hero-stats div:last-child { border-right: 0; }

.hero-stats dt {
  font-family: var(--display);
  font-size: 2.35rem;
  line-height: 1;
  min-height: 2.4rem;
  color: var(--gold);
  font-variant-numeric: lining-nums tabular-nums;
}

.hero-stats dd {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.shot {
  margin: 0;
}

.shot img {
  display: block;
  width: 100%;
  height: auto;
}

.sheet {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: auto;
  background: linear-gradient(180deg, #102838, #0b1c26);
  box-shadow: 0 40px 80px rgba(0, 0, 0, 0.35);
}

.sheet-bar, .sheet-formula, .sheet-tabs {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.7rem 1rem;
  font-size: 0.82rem;
}

.sheet-bar {
  background: #0a1a24;
  color: var(--muted);
  justify-content: space-between;
}

.sheet-dots {
  width: 42px;
  height: 10px;
  border-radius: 99px;
  background:
    radial-gradient(circle at 6px 5px, #ff6b6b 4px, transparent 5px),
    radial-gradient(circle at 20px 5px, #e8a317 4px, transparent 5px),
    radial-gradient(circle at 34px 5px, #3ec4e6 4px, transparent 5px);
}

.sheet-name { color: var(--paper); font-weight: 600; margin-right: auto; margin-left: 0.5rem; }

.sheet-engine {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--cyan);
}

.sheet-formula {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #0e2430;
}

.fx {
  font-style: italic;
  color: var(--gold);
  font-family: var(--display);
  width: 1.6rem;
}

.sheet-formula code {
  font-family: var(--mono);
  color: var(--cyan-2);
}

.grid {
  display: grid;
  grid-template-columns: 42px 1.4fr 1fr 1.3fr;
  min-width: 560px;
}

.g-corner, .g-col, .g-row {
  background: #0a1c26;
  color: var(--muted);
  font-size: 0.75rem;
  padding: 0.55rem 0.7rem;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.g-col { text-align: center; font-weight: 600; }
.g-row { text-align: center; }

.g-cell {
  padding: 0.62rem 0.8rem;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  min-height: 2.5rem;
}

.g-cell.muted { color: var(--muted); }
.g-cell.num { text-align: right; font-variant-numeric: tabular-nums; }
.g-cell.formula { font-family: var(--mono); font-size: 0.8rem; color: var(--cyan); }
.g-cell.gold {
  background: rgba(232, 163, 23, 0.18);
  color: var(--gold);
  font-weight: 600;
}
.g-cell.strong { font-weight: 700; }
.g-cell.live {
  outline: 1px solid rgba(62, 196, 230, 0.55);
  outline-offset: -1px;
}

.sheet-tabs {
  background: #08151d;
  gap: 0.4rem;
}

.tab {
  padding: 0.35rem 0.8rem;
  border-radius: 8px 8px 0 0;
  color: var(--muted);
}

.tab.on {
  background: #fff;
  color: #201f1e;
  font-weight: 600;
}

.split, .promises, .engine-section, .arch, .compare, .cta {
  padding: 5rem clamp(1.15rem, 6vw, 6rem);
  max-width: 1280px;
  margin: 0 auto;
}

.section-kicker {
  color: var(--gold);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.7rem;
}

h2 {
  font-size: clamp(2rem, 4vw, 3.3rem);
  line-height: 1.12;
  margin: 0 0 1rem;
}

.section-lead {
  max-width: 40rem;
  color: #c5dbe4;
  margin: 0 0 2.5rem;
}

.duo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.card {
  padding: 1.7rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(12, 34, 48, 0.55);
}

.card.engine {
  background: linear-gradient(180deg, rgba(10, 110, 143, 0.28), rgba(12, 34, 48, 0.7));
}

.tag {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 0.5rem;
}

.gold-tag { color: var(--gold); }

.card h3 { font-size: 1.85rem; margin: 0 0 0.6rem; }

.card ul {
  padding-left: 1.1rem;
  color: #c5dbe4;
}

.card li { margin: 0.35rem 0; }

.text-link {
  color: var(--cyan-2);
  text-decoration: none;
  font-family: var(--mono);
  font-size: 0.82rem;
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
}

.promise-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem 2.5rem;
}

.promise-grid .n {
  font-family: var(--mono);
  color: var(--gold);
  font-size: 0.8rem;
}

.promise-grid h3 { font-size: 1.45rem; margin: 0.4rem 0; }

.promise-grid p { color: #c5dbe4; margin: 0; }

.pipeline {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  counter-reset: step;
}

.pipeline li {
  counter-increment: step;
  padding: 1.2rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: #0b1d28;
  min-height: 10rem;
}

.pipeline li::before {
  content: "0" counter(step);
  display: block;
  font-family: var(--mono);
  color: var(--cyan);
  font-size: 0.78rem;
  margin-bottom: 0.6rem;
}

.pipeline strong { display: block; font-family: var(--display); font-size: 1.25rem; margin-bottom: 0.4rem; }
.pipeline span { color: var(--muted); font-size: 0.92rem; }

.families {
  margin-top: 2.5rem;
  padding: 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.families ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  list-style: none;
  padding: 0;
}

.families li {
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  background: rgba(62, 196, 230, 0.1);
  border: 1px solid var(--line);
}

.families b { color: var(--gold); margin-right: 0.25rem; }

.family-note { color: var(--muted); margin: 0.8rem 0 0; }

.arch-flow {
  display: grid;
  grid-template-columns: 0.8fr auto 1.4fr;
  gap: 1rem;
  align-items: center;
  margin-bottom: 2rem;
}

.arch-node {
  padding: 1.2rem 1.3rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: #0b1d28;
}

.arch-node.cpp {
  background: linear-gradient(160deg, #0a6e8f, #1565a8);
  border: 0;
}

.arch-node span, .arch-node small {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
}

.arch-node.cpp span { color: rgba(255, 255, 255, 0.75); }

.arch-node strong { font-family: var(--display); font-size: 1.3rem; }

.arch-hosts { display: grid; gap: 0.8rem; }

.arch-arrow {
  font-family: var(--mono);
  color: var(--cyan);
  text-align: center;
}

.code {
  margin: 0;
  padding: 1.4rem 1.5rem;
  border-radius: 16px;
  background: #061018;
  border: 1px solid var(--line);
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.7;
}

.kw { color: var(--cyan-2); }
.str { color: #f0c36a; }
.cmt { color: #6e8b97; }

.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

th, td {
  text-align: left;
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

thead th { color: var(--muted); font-weight: 500; }

td.hi, th.hi {
  background: rgba(62, 196, 230, 0.08);
  color: var(--paper);
}

.cta {
  text-align: center;
  padding-bottom: 6rem;
}

.cta-row {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.5rem;
}

.foot {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: center;
  padding: 1.5rem 6vw 2.2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
}

.foot div {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--paper);
  font-weight: 600;
}

.foot img { border-radius: 7px; }

.foot-note { max-width: 36rem; margin-left: auto; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

@media (max-width: 900px) {
  .nav-links { display: none; }
  .hero-stats, .duo, .promise-grid, .pipeline, .arch-flow {
    grid-template-columns: 1fr;
  }
  .hero-stats div { border: 0; padding: 0; }
  .arch-arrow { transform: rotate(90deg); }
  .grid {
    min-width: 0;
    grid-template-columns: 32px minmax(0, 1.3fr) minmax(0, 0.9fr) minmax(0, 1.1fr);
    font-size: 0.82rem;
  }
  .g-cell.formula { font-size: 0.68rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn:hover { transform: none; }
}