/* ctx.gottz.de — one stylesheet, no web fonts, no scripts (CSP: style-src 'self'). */

:root {
  --paper: #ecefea;
  --ink: #1b2220;
  --ink-2: #4a5550;
  --rule: #b9c2bb;
  --lapis: #2c4a9e;
  --lapis-soft: rgba(44, 74, 158, 0.16);
  --code-bg: #dfe4dc;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", "URW Palladio L", P052, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  --gutter: clamp(16px, 4vw, 48px);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #161b1a;
    --ink: #e1e6e0;
    --ink-2: #a3aea8;
    --rule: #3a4441;
    --lapis: #93a9ee;
    --lapis-soft: rgba(147, 169, 238, 0.18);
    --code-bg: #212826;
  }
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 1.0625rem/1.6 var(--sans);
}

a { color: var(--lapis); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--lapis); outline-offset: 3px; border-radius: 2px; }

h1, h2 { font-family: var(--serif); font-weight: 500; line-height: 1.15; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.3rem, 5.4vw, 3.9rem); margin: 0 0 0.45em; max-width: 14ch; }
h2 { font-size: clamp(1.55rem, 2.6vw, 1.95rem); margin: 0 0 0.6em; }

code, pre { font-family: var(--mono); font-size: 0.875em; }
code { background: var(--code-bg); padding: 0.08em 0.32em; border-radius: 3px; }
pre {
  background: var(--code-bg);
  padding: 1rem 1.1rem;
  border-radius: 4px;
  overflow-x: auto;
  line-height: 1.5;
  margin: 0 0 1.4em;
}
pre code { background: none; padding: 0; font-size: 1em; }

/* Header */
.top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem var(--gutter);
  max-width: 76rem;
  margin: 0 auto;
}
.mark {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
}
.top nav { display: flex; gap: 1.4rem; }
.top nav a { color: var(--ink-2); text-decoration: none; }
.top nav a:hover { color: var(--lapis); }

main { max-width: 76rem; margin: 0 auto; padding: 0 var(--gutter); }

/* Hero: text left, the rings right; stacks below 900px */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: center;
  padding: clamp(2rem, 7vw, 5.5rem) 0 clamp(2.5rem, 6vw, 5rem);
  border-bottom: 1px solid var(--rule);
}
.lede { font-size: 1.2rem; color: var(--ink-2); max-width: 36rem; margin: 0 0 1.8rem; }
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 0; }
.button {
  display: inline-block;
  padding: 0.62rem 1.15rem;
  border: 1px solid var(--lapis);
  border-radius: 4px;
  background: var(--lapis);
  color: var(--paper);
  text-decoration: none;
  font-weight: 600;
}
.button:hover { text-decoration: none; filter: brightness(1.08); }
.button-quiet { background: transparent; color: var(--lapis); }

.hero-figure { margin: 0; }
.hero-figure figcaption { font-size: 0.92rem; color: var(--ink-2); max-width: 34rem; margin-top: 0.4rem; }

/* The rings (inline SVG, styled here: presentation stays CSP-clean) */
.rings { display: block; width: 100%; height: auto; overflow: visible; }
.rings .ring { fill: none; stroke: var(--rule); stroke-width: 1.2; }
.rings .ring-active { stroke: var(--ink-2); stroke-width: 1.6; }
.rings .tick { stroke: var(--ink-2); stroke-width: 1.4; }
.rings .swell { fill: var(--lapis-soft); stroke: var(--lapis); stroke-width: 2; stroke-linejoin: round; }
.rings .peak { fill: var(--lapis); }
.rings .leader { stroke: var(--lapis); stroke-width: 1; }
.rings .q { font-family: var(--serif); font-size: 19px; fill: var(--ink); }
.rings .q-sub { font-family: var(--sans); font-size: 12px; fill: var(--ink-2); }
.rings .rl { font-family: var(--sans); font-size: 10.5px; fill: var(--ink-2); stroke: var(--paper); stroke-width: 4px; stroke-linejoin: round; }
.rings .rl-active { fill: var(--lapis); font-weight: 600; }

/* Sections: heading left, content right. The content column runs to the same
   right edge as the section rule; the 1 : 2.2 split keeps body lines near 80
   characters at full width. Below 900px everything stacks. */
:root { --section-cols: minmax(0, 1fr) minmax(0, 2.2fr); --section-gap: clamp(1.5rem, 4vw, 4rem); }

section { padding: clamp(2.2rem, 5vw, 3.6rem) 0; border-bottom: 1px solid var(--rule); }
.prose, .wide {
  display: grid;
  grid-template-columns: var(--section-cols);
  column-gap: var(--section-gap);
  align-items: start;
}
.prose > h2, .wide > h2 { grid-column: 1; grid-row: 1; margin-top: -0.12em; }
.prose > :not(h2), .wide > :not(h2) { grid-column: 2; min-width: 0; }
.prose p { margin: 0 0 1em; }
.prose > :last-child { margin-bottom: 0; }
.wide .narrow { margin: 0 0 1.6rem; }

/* The architecture diagram leaves the two-column grid: at 1200px native width
   its labels need the full section width (~1:1) to stay legible. */
.diagram { margin: 0; }
.wide > .diagram { grid-column: 1 / -1; margin-top: 0.6rem; }
.diagram img {
  max-width: 1200px;
  display: block;
  width: 100%;
  height: auto;
  /* no frame of our own: the SVG draws its own rounded panel */
}
.diagram figcaption { font-size: 0.92rem; margin-top: 0.6rem; }

/* Features as a definition list, not a card grid */
.features { margin: 0; display: grid; grid-template-columns: 13rem minmax(0, 1fr); gap: 0.9rem 1.6rem; }
.features dt { font-family: var(--serif); font-size: 1.12rem; font-weight: 600; }
.features dd { margin: 0; color: var(--ink-2); }

table { border-collapse: collapse; width: 100%; font-size: 0.97rem; }
th, td { text-align: left; padding: 0.55rem 0.8rem 0.55rem 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-weight: 600; }
td code { white-space: nowrap; }

.doclist { list-style: none; padding: 0; margin: 0; }
.doclist li { padding: 0.45rem 0; border-bottom: 1px solid var(--rule); }
.doclist li:last-child { border-bottom: 0; }
.doclist a { font-weight: 600; margin-right: 0.6rem; }
.doclist span { color: var(--ink-2); }

.foot {
  max-width: 76rem;
  margin: 0 auto;
  padding: 2rem var(--gutter) 3rem;
  color: var(--ink-2);
  font-size: 0.92rem;
  display: grid;
  grid-template-columns: var(--section-cols);
  column-gap: var(--section-gap);
}
.foot p { grid-column: 2; margin: 0 0 0.5em; }
.foot .badges { margin-bottom: 0.9em; }
.foot .badges img { display: block; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .hero-figure { max-width: 34rem; }
  .prose, .wide, .foot { display: block; }
}

@media (max-width: 620px) {
  .features { grid-template-columns: 1fr; gap: 0.2rem; }
  .features dd { margin-bottom: 0.9rem; }
  td code { white-space: normal; word-break: break-word; }
  .top nav { gap: 1rem; }
}