/*
 * Tideline's website.
 *
 * The palette is the app's own, lifted token for token from
 * app/Sources/Tideline/Views/Theme.swift so the site and the window are the
 * same colour. Every token carries a light value and a dark one and the page
 * follows prefers-color-scheme, exactly as the app follows the system
 * appearance. Yellow means what Tideline put there or is about to touch; red
 * is for faults, blue for something that only navigates, green for running.
 *
 * No framework, no build step, and no webfont: the app has no dependencies and
 * neither does the page describing it.
 */

:root {
  --accent: #ffd43b;
  --on-accent: #15181f;
  --accent-text: #a08000;
  --selection: rgba(255, 212, 59, 0.18);

  --chrome: #f4f6fa;
  --pane: #f8f9fb;
  --card: #ffffff;
  --hover: #e1e4e8;
  --border: #bcc4d1;

  --text: #202736;
  --muted: #505869;
  --faint: #6b7280;

  --danger: #d73a49;
  --success: #00b8a2;
  --link: #005cc5;

  --shadow: 0 1px 2px rgba(32, 39, 54, 0.06), 0 8px 24px rgba(32, 39, 54, 0.06);
  --radius: 10px;
  --measure: 34rem;

  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --accent: #ffd43b;
    --on-accent: #15181f;
    --accent-text: #ffd43b;

    --chrome: #202736;
    --pane: #15181f;
    --card: #202736;
    --hover: #2d3142;
    --border: #374151;

    --text: #d9dbe1;
    --muted: #9ba4b7;
    --faint: #6b7280;

    --danger: #ff6b6b;
    --success: #51cf66;
    --link: #74c0fc;

    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.25);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

/* The column keeps the footer on the bottom edge of the viewport when a page is
   shorter than the screen — the uninstall page is, and the footer used to float
   halfway up it. `flex: 1 0 auto` on the middle puts the slack there instead. */
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--pane);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body > main,
body > .docs { flex: 1 0 auto; }
body > footer { margin-top: auto; }

::selection { background: var(--selection); }

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

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

h1, h2, h3, h4 { line-height: 1.25; font-weight: 650; letter-spacing: -0.015em; }
h1 { font-size: 2.1rem; margin: 0 0 0.6rem; }
h2 { font-size: 1.5rem; margin: 2.8rem 0 0.8rem; }
h3 { font-size: 1.15rem; margin: 2rem 0 0.6rem; }
h4 { font-size: 1rem; margin: 1.6rem 0 0.4rem; }

p { margin: 0 0 1.1rem; }

hr { border: 0; border-top: 1px solid var(--border); margin: 3rem 0; }

/* ---------- Skip link ---------- */

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--on-accent);
  padding: 0.6rem 1rem;
  z-index: 100;
  border-radius: 0 0 var(--radius) 0;
}
.skip:focus { left: 0; }

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

/* ---------- The band across the top ---------- */
/* The app keeps a band above everything with its name, what it does, and the
   switch. The site keeps the first two and swaps the switch for the download. */

.band {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--chrome);
  border-bottom: 1px solid var(--border);
}

.band-inner {
  max-width: 68rem;
  margin: 0 auto;
  padding: 0.7rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 650;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.wordmark img { width: 26px; height: 26px; border-radius: 6px; }

.band nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 1.4rem;
  font-size: 0.94rem;
}
/* :not(.btn) matters: `.band nav a` outweighs `.btn-primary`, so without it the
   Download button paints accent text on an accent fill and cannot be read. */
.band nav a:not(.btn) { color: var(--muted); text-decoration: none; }
.band nav a:not(.btn):hover { color: var(--text); }
.band nav a:not(.btn)[aria-current="page"] { color: var(--text); font-weight: 600; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.62rem 1.15rem;
  border-radius: 8px;
  border: 1px solid transparent;
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

/* Accent is a filled surface, so its label is near-black and never white. */
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: #f5c518; }

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

/* ---------- Layout ---------- */

.wrap {
  max-width: 68rem;
  margin: 0 auto;
  padding-inline: 1.5rem;
}

/* Keeps the section's left edge on the same gutter as every other section and
   limits only the measure, rather than centring the whole block. */
.narrow > * { max-width: 46rem; }

/* ---------- Hero ---------- */

.hero { padding-block: 4.5rem 3.5rem; }

.hero h1 {
  font-size: clamp(2.1rem, 5.2vw, 3.1rem);
  max-width: 18ch;
  margin-bottom: 1rem;
}

.hero .lead {
  font-size: 1.2rem;
  color: var(--muted);
  max-width: 46ch;
  margin-bottom: 1.8rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr minmax(0, 24rem);
  gap: 3rem;
  align-items: center;
}

.cta { display: flex; flex-wrap: wrap; gap: 0.7rem; align-items: center; margin-top: 2rem; }

/* It closes the hero column, so its own bottom margin would sit on top of the
   section padding and make this one gap deeper than every other zone's. */
.cta-note {
  margin-top: 1rem;
  margin-bottom: 0;
  font-size: 0.9rem;
  color: var(--faint);
}

/* ---------- The folder sketch ---------- */
/* Not a screenshot: a Downloads folder written out, the way the README shows
   it. The arrows are what stays loose, so they take the accent. */

pre.tree, pre.shell {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.86rem;
  line-height: 1.75;
  margin: 0 0 1.2rem;
  box-shadow: var(--shadow);
}

pre .stays { color: var(--accent-text); font-weight: 600; }
pre .dir { color: var(--text); font-weight: 600; }
pre .comment { color: var(--faint); }

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--hover);
  padding: 0.1em 0.38em;
  border-radius: 4px;
}
pre code { background: none; padding: 0; font-size: inherit; }

/* ---------- Sections ---------- */

section { padding-block: 3.5rem; }

/* The section's padding is the gap. A child margin on the edge doubles it, and
   the doubled amount differs per element, so the zones drift out of step. */
section > :first-child,
section > .wrap > :first-child { margin-top: 0; }
section > :last-child,
section > .wrap > :last-child { margin-bottom: 0; }

.section-band { background: var(--chrome); border-block: 1px solid var(--border); }

.section-head { max-width: 42rem; margin-bottom: 2rem; }
.section-head h2 { margin-top: 0; }
.section-head p { color: var(--muted); margin-bottom: 0; }

/* ---------- Feature cards ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem 1.4rem;
}

.card h3 { margin: 0 0 0.45rem; font-size: 1.02rem; }
.card p { margin: 0; font-size: 0.94rem; color: var(--muted); }

/* A card that links somewhere — the docs index is a grid of these. */
a.card { text-decoration: none; display: block; color: var(--text); }
a.card:hover { border-color: var(--accent-text); background: var(--card); }
a.card h3 { color: var(--text); }

/* ---------- Figures ---------- */

figure {
  margin: 2rem 0;
}

/* <picture> is inline by default, which leaves a text-baseline gap under the
   image inside the figure's border. */
figure picture { display: block; }

figure img,
figure video {
  display: block;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* height is set as an attribute for the aspect ratio; let it scale with width. */
figure video { height: auto; background: var(--pane); }

figcaption {
  margin-top: 0.7rem;
  font-size: 0.88rem;
  color: var(--faint);
  max-width: var(--measure);
}

/* ---------- Callouts ---------- */
/* Meanings are kept apart, as they are in the window: accent for what the app
   put there, danger for a fault, link for something that only points you on. */

.note {
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  background: var(--card);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1rem 1.2rem;
  margin: 1.75rem 0;
  font-size: 0.95rem;
}
.note :last-child { margin-bottom: 0; }
.note strong:first-child { color: var(--accent-text); }

.note-info { border-left-color: var(--link); }
.note-info strong:first-child { color: var(--link); }

.note-warn { border-left-color: var(--danger); }
.note-warn strong:first-child { color: var(--danger); }

/* ---------- Beta pill ---------- */
/* Accent means "the app put this here or is about to touch it", which is not
   what a status label is, so this borrows the link colour instead — it marks
   something to go and read rather than something about to happen. */
.beta {
  display: inline-block;
  vertical-align: 0.12em;
  margin-left: 0.5rem;
  padding: 0.06em 0.5em;
  border: 1px solid var(--link);
  border-radius: 999px;
  color: var(--link);
  font-size: 0.62em;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.sidebar .beta { margin-left: 0.35rem; font-size: 0.6rem; }

/* ---------- Tables ---------- */

.table-scroll { overflow-x: auto; margin: 1.75rem 0; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

th, td {
  text-align: left;
  padding: 0.7rem 0.95rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
th { background: var(--chrome); font-weight: 650; font-size: 0.88rem; }
tr:last-child td { border-bottom: 0; }

/* ---------- Docs shell ---------- */

.docs {
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr);
  gap: 3.5rem;
  max-width: 68rem;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 4.5rem;
  font-size: 0.93rem;
}

.sidebar h2 {
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--faint);
  margin: 1.6rem 0 0.5rem;
  font-weight: 650;
}
.sidebar-grid > div:first-child h2 { margin-top: 0; }

.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li { margin: 0; }

.sidebar a {
  display: block;
  padding: 0.28rem 0.6rem;
  margin-left: -0.6rem;
  border-radius: 6px;
  color: var(--muted);
  text-decoration: none;
}
.sidebar a:hover { background: var(--hover); color: var(--text); }

/* The selected pane in the window is accent-backed; so is the page you are on. */
.sidebar a[aria-current="page"] {
  background: var(--selection);
  color: var(--text);
  font-weight: 600;
}

.doc { min-width: 0; }
.doc > h1 { margin-bottom: 0.5rem; }

.doc .lead {
  font-size: 1.12rem;
  color: var(--muted);
  margin-bottom: 2.5rem;
}

/* A page opening on a table, a figure or an h2 should start at the same place. */
.doc .lead + * { margin-top: 0; }

.doc p, .doc li { max-width: var(--measure); }
.doc ul, .doc ol { padding-left: 1.3rem; }
.doc li { margin-bottom: 0.4rem; }

/* Next/previous, at the foot of every page. */
.pager {
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.94rem;
}
.pager a { text-decoration: none; font-weight: 600; }
.pager span { display: block; font-size: 0.8rem; color: var(--faint); font-weight: 400; }
.pager .next { text-align: right; margin-left: auto; }

/* ---------- Footer ---------- */

footer {
  background: var(--chrome);
  border-top: 1px solid var(--border);
  padding-block: 2.5rem;
  font-size: 0.92rem;
  color: var(--muted);
}

footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: space-between;
  align-items: center;
}

footer nav { display: flex; flex-wrap: wrap; gap: 1.3rem; }

footer .footer-count {
  display: flex;
  justify-content: center;
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

/* Height is fixed and width is not: the badge grows a pixel or two as the count
   gains a digit, and pinning both would squash it. */
footer .footer-count img { height: 20px; width: auto; opacity: 0.8; }
footer .footer-count a:hover img { opacity: 1; }
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--text); text-decoration: underline; }

/* ---------- Narrow screens ---------- */

@media (max-width: 56rem) {
  .hero-grid { grid-template-columns: 1fr; gap: 2rem; }
  .docs { grid-template-columns: 1fr; gap: 2rem; padding-top: 1.5rem; }

  /* The sidebar stops being a sidebar and becomes a contents list on top. */
  .sidebar {
    position: static;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.2rem;
  }
  /* min() rather than a bare 11rem: below about 25rem two tracks of 11rem plus
     the gap are wider than the screen, and a grid track never shrinks under its
     minimum — so the whole page would scroll sideways to fit the contents. */
  .sidebar-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(11rem, 100%), 1fr));
    gap: 0 1.5rem;
  }
}

@media (max-width: 34rem) {
  body { font-size: 16px; }
  .band-inner { padding: 0.6rem 1rem; gap: 1rem; }
  .band nav { gap: 0.9rem; font-size: 0.88rem; }
  .wrap, .docs { padding-inline: 1rem; }
  .hero { padding-block: 2.5rem 2rem; }

  /* The GitHub link is the one the download button already covers. */
  .band nav .drop-first { display: none; }
}