/* CheapTrader site. One stylesheet, no scripts, no outside requests.
   Type: IBM Plex Sans and Plex Mono (SIL OFL 1.1), served from /fonts.
   Colours come from the program's own chart: ink #131722, accent #2962ff, green #089981, red #f23645. */

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/ibm-plex-sans-latin-400-normal.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("fonts/ibm-plex-sans-latin-600-normal.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("fonts/ibm-plex-mono-latin-500-normal.woff2") format("woff2");
}

:root {
  color-scheme: light dark;

  --bg: #ffffff;
  --bg-soft: #f3f4f7;
  --ink: #131722;
  --ink-2: #4a5062;
  --line: #d9dce4;
  --accent: #1d54e8;
  --accent-hover: #1442c4;
  --on-accent: #ffffff;
  --code-bg: #131722;
  --code-ink: #d1d4dc;

  --sans: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;

  --wrap: 72rem;
  --pad: clamp(1rem, 4vw, 2rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131722;
    --bg-soft: #1b2030;
    --ink: #e3e6ee;
    --ink-2: #a6acbc;
    --line: #2f3447;
    --accent: #7ea2ff;
    --accent-hover: #a3bcff;
    --on-accent: #0c1020;
    --code-bg: #0c0f18;
    --code-ink: #d1d4dc;
  }
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--sans);
  font-kerning: normal;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}
a:hover {
  color: var(--accent-hover);
  text-decoration-thickness: 0.14em;
}
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 600;
  text-wrap: balance;
}
h1 {
  font-size: clamp(2rem, 1.35rem + 2.7vw, 3.2rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
}
h2 {
  font-size: clamp(1.45rem, 1.2rem + 1vw, 1.9rem);
  line-height: 1.2;
}
h3 {
  font-size: 1.1875rem;
  line-height: 1.3;
}
p {
  margin: 0 0 1em;
  text-wrap: pretty;
}
ul,
ol {
  margin: 0 0 1em;
  padding-left: 1.3em;
}
li {
  margin-bottom: 0.45em;
}
code,
kbd {
  font-family: var(--mono);
  font-size: 0.88em;
}
code {
  padding: 0.08em 0.3em;
  background: var(--bg-soft);
  border-radius: 3px;
}
pre code {
  padding: 0;
  background: none;
  font-size: inherit;
}

.wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.skip {
  position: absolute;
  left: 0.75rem;
  top: -4rem;
  z-index: 10;
  padding: 0.5rem 0.9rem;
  background: var(--ink);
  color: var(--bg);
  border-radius: 4px;
}
.skip:focus {
  top: 0.75rem;
}

/* ---- top bar ---- */
.site-header {
  border-bottom: 1px solid var(--line);
}
.bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 2rem;
  padding-block: 0.9rem;
}
.name {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
  font-weight: 600;
  font-size: 1.15rem;
  text-decoration: none;
}
.name img {
  border-radius: 5px;
}
.bar nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
}
.bar nav a {
  color: var(--ink-2);
  text-decoration: none;
}
.bar nav a:hover {
  color: var(--ink);
  text-decoration: underline;
}

/* ---- the first screen: the name and the short explanation side by side, the picture large below ---- */
.hero {
  padding-block: clamp(2rem, 6vw, 4rem) clamp(1.5rem, 4vw, 3rem);
}
.hero-head {
  display: grid;
  grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  gap: 1.5rem clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}
.hero h1 {
  margin: 0 0 1.25rem;
}
.nowrap {
  white-space: nowrap;
}
.lead {
  max-width: 36rem;
  margin-bottom: 0;
  font-size: 1.1875rem;
}
.hero-side {
  padding-top: 0.6rem;
}
.get {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
  margin: 0 0 0.9rem;
}
.button {
  display: inline-block;
  padding: 0.8rem 1.4rem;
  background: var(--accent);
  color: var(--on-accent);
  border: 1px solid var(--accent);
  border-radius: 6px;
  font-weight: 600;
  text-decoration: none;
}
.button:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: var(--on-accent);
}
.meta {
  margin-bottom: 0.6rem;
  color: var(--ink-2);
  font-size: 0.9375rem;
}
.meta.mono {
  font-family: var(--mono);
  font-size: 0.84rem;
}
.hero-shot {
  margin-top: clamp(2rem, 5vw, 3.25rem);
}

figure {
  margin: 0;
}
figure img {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
}
figcaption {
  max-width: 44rem;
  margin-top: 0.6rem;
  color: var(--ink-2);
  font-size: 0.875rem;
  line-height: 1.5;
}

/* ---- features: one row each, text and picture swap sides ---- */
.features > h2 {
  padding-top: clamp(1rem, 3vw, 2rem);
}
.feature {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: start;
  padding-block: clamp(2rem, 5vw, 3.5rem);
  border-top: 1px solid var(--line);
}
.features > h2 + .feature {
  margin-top: 1.25rem;
}
.feature:nth-of-type(even) {
  grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
}
.feature:nth-of-type(even) .text {
  order: 2;
}
.feature h3 {
  margin-bottom: 0.75rem;
}
.feature .text p {
  max-width: 36rem;
}

dl.facts {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 0.55rem 1.25rem;
  margin: 1.4rem 0 0;
  font-size: 0.9375rem;
}
dl.facts dt {
  padding-top: 0.12rem;
  color: var(--ink-2);
  font-family: var(--mono);
  font-size: 0.8rem;
}
dl.facts dd {
  margin: 0;
}

pre {
  margin: 1.25rem 0 0;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: 6px;
  font: 400 0.875rem/1.6 var(--mono);
  tab-size: 4;
}
pre .k {
  color: #ff8a9b;
}
pre .f {
  color: #8fb0ff;
}
pre .s {
  color: #8ee3c6;
}
pre .c {
  color: #8b92a8;
}

.small-things {
  padding-block: clamp(2rem, 5vw, 3.5rem);
  border-top: 1px solid var(--line);
}
.small-things h3 {
  margin-bottom: 1rem;
}
.small-things ul {
  columns: 2 22rem;
  column-gap: 3rem;
  padding-left: 1.1em;
}
.small-things li {
  break-inside: avoid;
}

/* ---- text sections: the heading in the margin, the text beside it ---- */
.doc {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
  gap: 1rem clamp(1.5rem, 4vw, 3.5rem);
  padding-block: 0 clamp(2rem, 5vw, 3.5rem);
  margin-top: clamp(2rem, 5vw, 3.5rem);
}
.doc::before {
  content: "";
  grid-column: 1 / -1;
  margin-bottom: clamp(1rem, 3vw, 2rem);
  border-top: 1px solid var(--line);
}
.doc > h2 {
  position: sticky;
  top: 1rem;
  align-self: start;
}
.doc .body {
  max-width: 41rem;
}
.doc h3 {
  margin: 1.6rem 0 0.4rem;
}
.doc .body > :first-child {
  margin-top: 0;
}
.doc .body > :last-child {
  margin-bottom: 0;
}

.doc figure {
  max-width: 34rem;
  margin: 1.4rem 0 0;
}

ol.steps li {
  padding-left: 0.3em;
}
ol.steps li::marker {
  color: var(--ink-2);
  font-family: var(--mono);
  font-size: 0.9em;
}

dl.log {
  margin: 0;
}
dl.log dt {
  margin-top: 1.5rem;
  font-weight: 600;
}
dl.log dt:first-child {
  margin-top: 0;
}
dl.log dt time {
  margin-left: 0.6rem;
  color: var(--ink-2);
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 400;
}
dl.log dd {
  margin: 0.4rem 0 0;
}
dl.log ul {
  margin: 0;
}

.qa h3 {
  margin: 1.8rem 0 0.35rem;
}
.qa h3:first-child {
  margin-top: 0;
}
.qa p {
  margin-bottom: 0;
}

/* ---- footer ---- */
.site-footer {
  margin-top: 1rem;
  padding-block: 2.5rem 3.5rem;
  border-top: 1px solid var(--line);
  color: var(--ink-2);
  font-size: 0.9rem;
}
.site-footer .cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1.5rem 3rem;
}
.site-footer h2 {
  margin-bottom: 0.4rem;
  color: var(--ink);
  font-size: 0.95rem;
}
.site-footer p {
  margin: 0 0 0.7em;
}
.site-footer a {
  color: var(--ink-2);
}
.site-footer a:hover {
  color: var(--ink);
}

/* ---- narrow screens ---- */
@media (max-width: 52rem) {
  .hero-head,
  .feature,
  .feature:nth-of-type(even),
  .doc {
    grid-template-columns: minmax(0, 1fr);
  }
  .feature:nth-of-type(even) .text {
    order: 0;
  }
  .doc > h2 {
    position: static;
  }
  .button {
    padding-block: 0.9rem;
  }
}
@media (max-width: 30rem) {
  dl.facts {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.1rem;
  }
  dl.facts dd {
    margin-bottom: 0.6rem;
  }
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}
@media print {
  .bar nav,
  .skip {
    display: none;
  }
  a {
    color: inherit;
  }
}