/* oneline.tools — the one stylesheet (docs/design/27-public-website.md).
   System fonts only, no external requests. Light and dark follow the OS. */

:root {
  color-scheme: light dark;

  --bg: #ffffff;
  --bg-soft: #f3f5f8;
  --surface: #ffffff;
  --text: #15202b;
  --muted: #4a5968;
  --border: #d5dce4;
  --border-strong: #b9c4cf;
  --accent: #0b64c0;
  --accent-hover: #084f99;
  --accent-soft: #e7f1fc;
  --on-accent: #ffffff;
  --focus: #0b64c0;
  --shadow: 0 1px 2px rgb(21 32 43 / 6%), 0 8px 28px rgb(21 32 43 / 10%);

  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --wrap: 72rem;
  --measure: 40rem;
  --gutter: 1rem;
  --radius: 8px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1720;
    --bg-soft: #151f2a;
    --surface: #1a2531;
    --text: #e6edf5;
    --muted: #a6b3c1;
    --border: #2b3846;
    --border-strong: #3c4b5b;
    --accent: #5aacff;
    --accent-hover: #86c2ff;
    --accent-soft: #16304b;
    --on-accent: #0b1520;
    --focus: #86c2ff;
    --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 8px 28px rgb(0 0 0 / 35%);
  }
}

@media (min-width: 40rem) {
  :root { --gutter: 1.5rem; }
}

/* --- base ---------------------------------------------------------------- */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.6;
  overflow-wrap: break-word;
}

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

h1, h2, h3, h4 {
  margin: 0 0 0.6em;
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.012em;
  text-wrap: balance;
}

h1 { font-size: clamp(2rem, 1.35rem + 3vw, 3.2rem); line-height: 1.1; }
h2 { font-size: clamp(1.5rem, 1.2rem + 1.4vw, 2.1rem); }
h3 { font-size: 1.2rem; }

p, ul, ol, dl, table, figure { margin: 0 0 1.1em; }
p { text-wrap: pretty; }

a { color: var(--accent); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { color: var(--accent-hover); text-decoration-thickness: 2px; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 3px;
}

strong { font-weight: 650; }

.skip {
  position: absolute;
  left: 0.5rem;
  top: -4rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--accent);
  color: var(--on-accent);
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
}
.skip:focus { top: 0.5rem; color: var(--on-accent); }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.measure { max-width: var(--measure); }
.lead { font-size: 1.2rem; color: var(--muted); max-width: var(--measure); }
.muted { color: var(--muted); }
.small { font-size: 0.93rem; }

/* --- header --------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
  min-height: 4rem;
}

.brand { display: inline-flex; align-items: center; padding: 0.35rem 0; margin-right: auto; }
.brand img { height: 2.1rem; width: auto; }

.nav-toggle {
  display: none;
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 0.45rem 0.8rem;
  cursor: pointer;
}
.nav-toggle[aria-expanded="true"] { background: var(--bg-soft); }

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 1.5rem;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  padding: 0.35rem 0;
  display: inline-block;
}
.site-nav a:hover { color: var(--accent); }
.site-nav a[aria-current="page"] {
  color: var(--accent);
  box-shadow: inset 0 -2px 0 currentColor;
}

.nav-extra { display: flex; align-items: center; gap: 1rem; }
.nav-extra .lang {
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  padding: 0.15rem 0.45rem;
}
.site-nav .login {
  font-weight: 600;
  color: var(--accent);
}

/* Mobile: the menu folds behind a button, but only once the script runs. */
@media (max-width: 53.99rem) {
  .js .nav-toggle { display: inline-block; }
  .js .site-nav { display: none; }
  .js .site-nav.is-open { display: flex; }
  .site-nav {
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    padding-bottom: 0.75rem;
  }
  .site-nav ul { flex-direction: column; gap: 0; }
  .site-nav ul a { display: block; padding: 0.6rem 0; border-top: 1px solid var(--border); }
  .site-nav a[aria-current="page"] { box-shadow: inset 3px 0 0 currentColor; padding-left: 0.75rem; }
  .nav-extra { padding-top: 0.6rem; border-top: 1px solid var(--border); }
}

/* --- buttons -------------------------------------------------------------- */

.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 1.5rem 0; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.9rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  text-align: center;
}
.btn:hover { text-decoration: none; }

.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-hover); color: var(--on-accent); }

.btn-secondary { background: var(--surface); color: var(--text); border-color: var(--border-strong); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

.btn .ext {
  font-family: var(--mono);
  font-size: 0.78em;
  font-weight: 500;
  color: var(--muted);
}

/* --- sections ------------------------------------------------------------- */

.section { padding-block: clamp(2.75rem, 2rem + 4vw, 5rem); }
.section-soft { background: var(--bg-soft); border-block: 1px solid var(--border); }
.section-head { max-width: var(--measure); margin-bottom: 2rem; }
.section-head p { color: var(--muted); }

.page-head { padding-block: clamp(2.5rem, 2rem + 3vw, 4.5rem) 0; }
.page-head .lead { margin-bottom: 0; }

.hero { padding-block: clamp(2.5rem, 2rem + 4vw, 5rem) clamp(2rem, 1.5rem + 3vw, 4rem); }
.hero h1 { max-width: 18ch; }
.hero .lead { margin-top: 1.25rem; }
.hero .tagline { font-weight: 600; margin-bottom: 0; }
.hero .audience { color: var(--muted); font-size: 0.97rem; margin: 0; }

.eyebrow {
  display: block;
  margin-bottom: 0.6rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* --- screenshots ---------------------------------------------------------- */

.shot {
  margin: 0;
}
.shot img {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  background: #fff;
}
.shot figcaption {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  color: var(--muted);
}
.hero-shot { margin-top: clamp(2rem, 1.5rem + 3vw, 3.5rem); }

/* --- grids ---------------------------------------------------------------- */

.grid { display: grid; gap: 1.25rem; }
@media (min-width: 48rem) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.4rem 0.4rem;
}
.card h3 { margin-bottom: 0.5rem; }
.card p { color: var(--muted); }

.feature { border-top: 2px solid var(--accent); padding-top: 1.1rem; }
.feature p { color: var(--muted); }

/* numbered steps */
.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1.25rem;
  counter-reset: step;
}
@media (min-width: 48rem) { .steps { grid-template-columns: repeat(3, 1fr); } }
.steps li { counter-increment: step; position: relative; padding-top: 3.1rem; }
.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 0;
  left: 0;
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  padding: 0.25rem 0.5rem;
}
.steps li p { color: var(--muted); margin: 0; }
.steps li strong { display: block; color: var(--text); font-size: 1.12rem; margin-bottom: 0.35rem; }

/* split: text beside a screenshot */
.split { display: grid; gap: 2rem; align-items: start; }
@media (min-width: 60rem) {
  .split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 3rem; }
  .split.reverse > :first-child { order: 2; }
}

/* ticked lists */
.ticks { list-style: none; padding: 0; }
.ticks li { position: relative; padding-left: 1.6rem; margin-bottom: 0.55rem; }
.ticks li::before {
  content: "";
  position: absolute;
  left: 0.15rem;
  top: 0.62em;
  width: 0.55rem;
  height: 0.55rem;
  border: 2px solid var(--accent);
  border-radius: 50%;
}

/* --- tables --------------------------------------------------------------- */

.compare { width: 100%; border-collapse: collapse; font-size: 1rem; }
.compare caption { text-align: left; font-weight: 600; margin-bottom: 0.75rem; }
.compare th, .compare td {
  text-align: left;
  vertical-align: top;
  padding: 0.85rem 1rem 0.85rem 0;
  border-bottom: 1px solid var(--border);
}
.compare thead th {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom-color: var(--border-strong);
}
.compare tbody th { font-weight: 600; width: 38%; }
.compare td { color: var(--muted); }

@media (max-width: 37.99rem) {
  .compare thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  .compare tr { display: block; padding: 0.85rem 0; border-bottom: 1px solid var(--border); }
  .compare th, .compare td { display: block; width: auto; padding: 0; border: 0; }
  .compare tbody th { width: auto; margin-bottom: 0.2rem; }
}

/* --- pricing: a table on wide screens, cards on narrow ones ---------------- */

.plans {
  display: grid;
  gap: 1rem;
  margin-block: 2rem 1.5rem;
}
.plan {
  display: grid;
  grid-template-rows: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem;
  gap: 0;
}
.plan > * { margin: 0; }
.plan h3 { font-size: 1.3rem; margin-bottom: 0.9rem; }
.plan dt {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 1rem;
  margin-bottom: 0.3rem;
}
.plan dl { margin: 0; display: contents; }
.plan dd { margin: 0; }
.plan .price-row { padding-bottom: 0.9rem; border-bottom: 1px solid var(--border); }
.plan .badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  margin-bottom: 0.35rem;
}
.plan .amount { display: block; font-size: 2.2rem; font-weight: 700; line-height: 1.1; letter-spacing: -0.02em; }
.plan .unit { display: block; color: var(--muted); font-size: 0.95rem; }
.plan .regular { display: block; font-size: 0.9rem; color: var(--muted); margin-top: 0.5rem; }
.plan .plan-cta { margin-top: 1.25rem; align-self: end; }
.plan .plan-cta .btn { width: 100%; }

@media (min-width: 40rem) and (max-width: 63.99rem) {
  .plans { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 64rem) {
  /* Rows line up across the four plans: name, price, for whom, included, button. */
  .plans { grid-template-columns: repeat(4, 1fr); grid-template-rows: repeat(8, auto); gap: 0 1rem; }
  .plan { grid-row: span 8; grid-template-rows: subgrid; }
}

.plan-note { max-width: var(--measure); }

/* --- FAQ ------------------------------------------------------------------ */

.faq { max-width: 46rem; }
.faq h3 { font-size: 1.12rem; margin-top: 2rem; margin-bottom: 0.4rem; }
.faq h3:first-of-type { margin-top: 0; }
.faq p { color: var(--muted); }
.toc { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; padding: 0; margin: 1.5rem 0 0; list-style: none; }
.toc a { font-weight: 500; }

/* --- notes, CTA band, footer ---------------------------------------------- */

.note {
  border-left: 3px solid var(--border-strong);
  padding: 0.25rem 0 0.25rem 1rem;
  color: var(--muted);
  font-size: 0.97rem;
  max-width: var(--measure);
}

.cta-band { text-align: left; }
.cta-band h2 { max-width: 22ch; }
.cta-band p { color: var(--muted); max-width: var(--measure); }

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  padding-block: 2.5rem 2rem;
  font-size: 0.93rem;
  color: var(--muted);
}
.footer-grid { display: grid; gap: 1.5rem; }
@media (min-width: 48rem) { .footer-grid { grid-template-columns: 2fr 1fr 1fr; } }
.site-footer h2 {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.6rem;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 0.35rem; }
.site-footer a { color: var(--text); }
.site-footer .brand img { height: 1.75rem; }
.site-footer .legal { margin-top: 2rem; padding-top: 1.25rem; border-top: 1px solid var(--border); }

/* the logo swaps with the colour scheme */
.logo-dark { display: none; }
@media (prefers-color-scheme: dark) {
  .logo-light { display: none; }
  .logo-dark { display: block; }
}

/* 404 */
.notfound { padding-block: 4rem; }
.notfound + .notfound { padding-top: 0; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

@media print {
  .site-header, .site-footer, .actions, .skip { display: none; }
  body { font-size: 11pt; }
}