/* ============================================================
   Vantulo — news / announcements
   ============================================================ */

:root {
  color-scheme: light;
  --bg: #fbfbf9;
  --bg-2: #f3f3ef;
  --card: #ffffff;
  --border: #e5e5e0;
  --border-strong: #d2d2cc;
  --ink: #141413;
  --ink-2: #57574f;
  --ink-3: #8c8c84;
  --accent: #0e7c6b;
  --accent-strong: #0a5f52;
  --accent-soft: #e2f2ee;
  --gpt: #5b6ee1;
  --claude: #d0764a;
  --danger: #c2412f;
  --danger-soft: #fdeeec;
  --code-bg: #f4f4f0;
  --font: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI Variable Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --display: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Code", Consolas, Menlo, monospace;
  --text: 680px;
  --wide: 1000px;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #161615;
    --bg-2: #1f1f1d;
    --card: #1f1f1d;
    --border: #2f2f2c;
    --border-strong: #42423e;
    --ink: #ededea;
    --ink-2: #b4b4ad;
    --ink-3: #85857e;
    --accent: #2bb69c;
    --accent-strong: #5fd3bb;
    --accent-soft: rgba(43, 182, 156, 0.14);
    --gpt: #8190f0;
    --claude: #e8926a;
    --danger: #ff7c6c;
    --danger-soft: rgba(255, 124, 108, 0.1);
    --code-bg: #1c1c1a;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; }
::selection { background: var(--accent-soft); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

/* ------------------------------- nav ------------------------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
.nav.scrolled { border-bottom-color: var(--border); }
.nav-inner {
  max-width: 1160px;
  margin: 0 auto;
  height: 64px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(140deg, #1bb096, #0a5f52);
  display: grid;
  place-items: center;
}
.logo-mark svg { width: 17px; height: 17px; fill: none; stroke: #fff; stroke-width: 2.9; stroke-linecap: round; stroke-linejoin: round; }
.logo-name { font-family: var(--display); font-size: 20px; }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  text-decoration: none;
  font-size: 14.5px;
  color: var(--ink-2);
  padding: 7px 12px;
  border-radius: 9px;
  transition: color 0.15s, background 0.15s;
}
.nav-links a:hover { color: var(--ink); background: var(--bg-2); }
.nav-links a.current { color: var(--ink); }
.nav-links a.btn-try {
  background: var(--ink);
  color: var(--bg);
  font-weight: 550;
  padding: 8px 16px;
  border-radius: 999px;
  margin-left: 6px;
}
.nav-links a.btn-try:hover { background: var(--ink-2); }

/* ------------------------------- hero ------------------------------ */

.hero {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 72px 24px 40px;
  text-align: center;
}
.meta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--ink-3);
  margin-bottom: 22px;
}
.meta .tag {
  color: var(--accent-strong);
  background: var(--accent-soft);
  font-weight: 600;
  font-size: 12.5px;
  letter-spacing: 0.02em;
  padding: 3px 10px;
  border-radius: 999px;
}
.hero h1 {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(44px, 7.2vw, 84px);
  line-height: 1.02;
  letter-spacing: -0.025em;
  margin: 0 auto 22px;
  max-width: 14ch;
}
.hero .lead {
  font-size: clamp(18px, 2.1vw, 21px);
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 36em;
  margin: 0 auto 30px;
}
.hero-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 46px;
  padding: 0 22px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 550;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
  cursor: pointer;
  border: none;
  font-family: inherit;
}
.btn:active { transform: scale(0.98); }
.btn svg { width: 16px; height: 16px; }
.btn-solid { background: var(--accent); color: #fff; }
.btn-solid:hover { background: var(--accent-strong); }
.btn-line { border: 1px solid var(--border-strong); color: var(--ink); background: transparent; }
.btn-line:hover { background: var(--bg-2); }

/* hero art: the V mark drawing itself over a soft grid */
.hero-art {
  position: relative;
  max-width: var(--wide);
  height: clamp(240px, 36vw, 420px);
  margin: 12px auto 0;
  border-radius: 28px;
  overflow: hidden;
  background:
    radial-gradient(60% 80% at 50% 110%, color-mix(in srgb, var(--accent) 28%, transparent), transparent 70%),
    linear-gradient(180deg, var(--bg-2), var(--card));
  border: 1px solid var(--border);
}
.hero-art::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(70% 70% at 50% 50%, #000 20%, transparent 80%);
  mask-image: radial-gradient(70% 70% at 50% 50%, #000 20%, transparent 80%);
  opacity: 0.8;
}
.hero-art svg.big-v {
  position: absolute;
  left: 50%;
  top: 50%;
  width: clamp(120px, 20vw, 210px);
  height: auto;
  transform: translate(-50%, -52%);
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 24;
  stroke-dashoffset: 24;
  animation: draw 1.8s 0.2s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  filter: drop-shadow(0 10px 30px color-mix(in srgb, var(--accent) 40%, transparent));
}
.hero-art .orbit {
  position: absolute;
  left: 50%;
  top: 50%;
  width: clamp(200px, 32vw, 340px);
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px dashed color-mix(in srgb, var(--accent) 40%, transparent);
  animation: spin 40s linear infinite;
}
.hero-art .orbit::after {
  content: "";
  position: absolute;
  top: -5px;
  left: 50%;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 16px var(--accent);
}
.hero-art .orbit.o2 { width: clamp(280px, 46vw, 500px); animation-duration: 70s; animation-direction: reverse; opacity: 0.6; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes spin { to { transform: translate(-50%, -50%) rotate(360deg); } }

/* ------------------------------- toc ------------------------------- */

.toc {
  max-width: var(--text);
  margin: 48px auto 0;
  padding: 0 24px;
}
.toc ol {
  list-style: none;
  margin: 0;
  padding: 18px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 26px;
  counter-reset: toc;
}
.toc li { counter-increment: toc; font-size: 15px; }
.toc a { text-decoration: none; color: var(--ink-2); }
.toc a::before { content: counter(toc, decimal-leading-zero); color: var(--ink-3); font-family: var(--mono); font-size: 12px; margin-right: 8px; }
.toc a:hover { color: var(--accent-strong); }

/* ------------------------------ article ---------------------------- */

article { padding: 20px 24px 40px; }
article > * { max-width: var(--text); margin-left: auto; margin-right: auto; }
article section { scroll-margin-top: 84px; }
article h2 {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(30px, 4vw, 40px);
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin: 72px auto 18px;
}
article h3 {
  font-size: 19px;
  font-weight: 650;
  letter-spacing: -0.01em;
  margin: 40px auto 8px;
}
article p { margin: 0 auto 18px; }
article p.big { font-size: 20px; line-height: 1.6; color: var(--ink); }
article ul { padding-left: 1.3em; margin: 0 auto 22px; }
article li { margin: 8px 0; padding-left: 4px; }
article li::marker { color: var(--accent); }
article strong { font-weight: 650; }
article a.inline { color: var(--accent-strong); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
article code {
  font-family: var(--mono);
  font-size: 0.84em;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.1em 0.4em;
}
.wide { max-width: var(--wide); }

/* callout */
.callout {
  display: flex;
  gap: 14px;
  padding: 20px 22px;
  border-radius: 18px;
  background: var(--accent-soft);
  margin: 28px auto;
}
.callout svg { width: 22px; height: 22px; flex-shrink: 0; color: var(--accent-strong); margin-top: 3px; }
.callout p { margin: 0; font-size: 16px; }
.callout.warn { background: var(--danger-soft); }
.callout.warn svg { color: var(--danger); }

/* key points */
.points {
  list-style: none;
  padding: 0 !important;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.points li {
  margin: 0;
  padding: 18px 18px 16px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--card);
  font-size: 15.5px;
  line-height: 1.55;
}
.points li b { display: block; font-size: 15px; margin-bottom: 4px; }

/* ----------------------------- figures ----------------------------- */

figure { margin: 36px auto; }
.figure-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 28px;
}
.fig-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 22px; }
.fig-title { font-size: 17px; font-weight: 650; }
.fig-sub { font-size: 14px; color: var(--ink-3); }
figcaption { font-size: 13.5px; color: var(--ink-3); line-height: 1.55; margin-top: 12px; padding: 0 4px; }

.chart { display: flex; flex-direction: column; gap: 16px; position: relative; padding-bottom: 28px; }
.chart .axis { position: absolute; left: 170px; right: 64px; top: 0; bottom: 0; pointer-events: none; }
.chart .tick { position: absolute; top: 0; bottom: 20px; border-left: 1px dashed var(--border); }
.chart .tick span { position: absolute; bottom: -22px; transform: translateX(-50%); font-size: 12px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.row { display: grid; grid-template-columns: 170px 1fr 64px; align-items: center; position: relative; }
.row-name { font-size: 15px; font-weight: 550; padding-right: 12px; }
.row-name small { display: block; font-weight: 400; color: var(--ink-3); font-size: 12.5px; }
.track { height: 40px; border-radius: 10px; background: color-mix(in srgb, var(--bg-2) 80%, transparent); overflow: hidden; }
.fill { height: 100%; width: 0; border-radius: 10px; transition: width 1.4s cubic-bezier(0.2, 0.7, 0.2, 1); }
.val { text-align: right; font-weight: 700; font-size: 18px; font-variant-numeric: tabular-nums; }
.row.win .val { color: var(--accent-strong); }

.table-wrap { overflow-x: auto; margin: 32px auto; border: 1px solid var(--border); border-radius: 18px; background: var(--card); }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
tr:last-child td { border-bottom: none; }
th { font-size: 13px; font-weight: 600; color: var(--ink-2); background: var(--bg-2); }
th.us, td.us { background: var(--accent-soft); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
td .best { font-weight: 700; }
td .dom { display: block; font-size: 12.5px; color: var(--ink-3); }

/* ----------------------------- safeguards -------------------------- */

.flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  counter-reset: step;
}
.flow > div {
  position: relative;
  padding: 18px 16px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--card);
  counter-increment: step;
}
.flow > div::before {
  content: counter(step);
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 10px;
}
.flow b { display: block; font-size: 15px; margin-bottom: 4px; }
.flow span { display: block; font-size: 14px; color: var(--ink-2); line-height: 1.5; }

.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 28px auto; }
.col {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
  background: var(--card);
}
.col h4 { display: flex; align-items: center; gap: 9px; margin: 0 0 12px; font-size: 16px; }
.col h4 svg { width: 20px; height: 20px; }
.col.ok h4 svg { color: var(--accent); }
.col.no h4 svg { color: var(--danger); }
.col ul { list-style: none; padding: 0; margin: 0; }
.col li { display: flex; gap: 10px; font-size: 15px; margin: 9px 0; padding: 0; line-height: 1.45; }
.col li::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  margin-top: 8px;
  flex-shrink: 0;
  background: var(--accent);
}
.col.no li::before { background: var(--danger); }

.cta-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin: 32px auto;
  padding: 26px 28px;
  border-radius: 22px;
  background: linear-gradient(135deg, #0f8a76, #0a5f52);
  color: #fff;
}
.cta-card h4 { margin: 0 0 4px; font-size: 19px; font-weight: 650; }
.cta-card p { margin: 0; font-size: 15px; color: rgba(255, 255, 255, 0.82); }
.cta-card .btn { background: #fff; color: #0a5f52; }
.cta-card .btn:hover { background: #eaf6f3; }

/* code sample */
.code {
  margin: 24px auto;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--code-bg);
  overflow: hidden;
}
.code-bar { display: flex; justify-content: space-between; align-items: center; padding: 8px 10px 8px 18px; border-bottom: 1px solid var(--border); font-size: 13px; color: var(--ink-3); }
.code-bar button { font: inherit; font-size: 13px; color: var(--ink-2); background: none; border: 1px solid var(--border); border-radius: 8px; padding: 4px 10px; cursor: pointer; }
.code-bar button:hover { color: var(--ink); }
.code pre { margin: 0; padding: 16px 18px; overflow-x: auto; font-family: var(--mono); font-size: 13.5px; line-height: 1.65; }
.code .k { color: var(--accent-strong); }
.code .s { color: #b45f2e; }
@media (prefers-color-scheme: dark) { .code .s { color: #f0a36f; } }

/* share row */
.share {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin: 56px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 14.5px;
  color: var(--ink-3);
}
.share-btns { display: flex; gap: 8px; }
.share-btns a, .share-btns button {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 36px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
}
.share-btns a:hover, .share-btns button:hover { background: var(--bg-2); }
.share-btns svg { width: 15px; height: 15px; }

/* ------------------------------- footer ---------------------------- */

.footer { border-top: 1px solid var(--border); margin-top: 72px; background: var(--bg-2); }
.footer-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: 48px 24px 40px;
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 28px;
}
.footer h5 { margin: 0 0 12px; font-size: 13px; font-weight: 600; color: var(--ink-3); }
.footer ul { list-style: none; margin: 0; padding: 0; }
.footer li { margin: 8px 0; font-size: 14.5px; }
.footer li a { text-decoration: none; color: var(--ink-2); }
.footer li a:hover { color: var(--ink); }
.footer .tagline { font-size: 14.5px; color: var(--ink-2); margin: 12px 0 0; max-width: 26ch; line-height: 1.5; }
.footer-base { max-width: 1160px; margin: 0 auto; padding: 18px 24px 30px; font-size: 13px; color: var(--ink-3); border-top: 1px solid var(--border); }

/* ------------------------------ news index ------------------------- */

.index-head { max-width: 1160px; margin: 0 auto; padding: 72px 24px 24px; }
.index-head h1 { font-family: var(--display); font-weight: 400; font-size: clamp(44px, 6vw, 72px); letter-spacing: -0.02em; margin: 0 0 8px; }
.index-head p { color: var(--ink-2); margin: 0; font-size: 18px; }
.posts { max-width: 1160px; margin: 0 auto; padding: 24px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.post-card {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 22px;
  overflow: hidden;
  background: var(--card);
  transition: transform 0.2s, box-shadow 0.2s;
}
.post-card:hover { transform: translateY(-3px); box-shadow: 0 14px 40px rgba(0, 0, 0, 0.08); }
.post-card.featured { grid-column: span 3; flex-direction: row; }
.post-art {
  position: relative;
  aspect-ratio: 16 / 10;
  background:
    radial-gradient(70% 90% at 50% 110%, color-mix(in srgb, var(--accent) 30%, transparent), transparent 70%),
    linear-gradient(180deg, var(--bg-2), var(--card));
  display: grid;
  place-items: center;
}
.post-card.featured .post-art { flex: 1.2; aspect-ratio: auto; min-height: 320px; }
.post-art svg { width: 30%; max-width: 150px; fill: none; stroke: var(--accent); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.post-body { padding: 24px 26px 26px; flex: 1; display: flex; flex-direction: column; justify-content: center; }
.post-body .meta { margin-bottom: 12px; }
.post-body h2 { font-family: var(--display); font-weight: 400; font-size: clamp(26px, 3vw, 40px); line-height: 1.1; margin: 0 0 10px; letter-spacing: -0.015em; }
.post-body p { color: var(--ink-2); margin: 0; font-size: 16px; line-height: 1.55; }
.read { margin-top: 18px; font-size: 14.5px; font-weight: 600; color: var(--accent-strong); }

/* reveal */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1); }
.reveal.in { opacity: 1; transform: none; }

@media (max-width: 820px) {
  .nav-links a:not(.btn-try):not(.keep) { display: none; }
  .points, .cols { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr 1fr; }
  .row { grid-template-columns: 118px 1fr 52px; }
  .chart .axis { left: 118px; right: 52px; }
  .row-name { font-size: 13.5px; }
  .figure-card { padding: 20px; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .posts { grid-template-columns: 1fr; }
  .post-card.featured { grid-column: auto; flex-direction: column; }
  .post-card.featured .post-art { min-height: 220px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition-duration: 0.01ms !important; }
  .hero-art svg.big-v { stroke-dashoffset: 0; }
  .reveal { opacity: 1; transform: none; }
}