/* Arcana website - plain CSS, no framework */

:root {
  --paper: #f2f4f1;
  --sheet: #fbfcfa;
  --ink: #1d2422;
  --ink-soft: #4a5552;
  --rule: #cfd5cf;
  --blue: #1b5a78;
  --blue-deep: #12415a;
  --mark: #f6d55c;
  --mark-ink: #3b3000;
  --ok: #2d6a3e;
  --bad: #9a2f22;
  --code-bg: #e7ebe6;
  --term-bg: #1f2826;
  --term-ink: #dfe7e2;
  --term-dim: #8fa39b;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", Consolas, "Liberation Mono", monospace;
  --measure: 46rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #151a19;
    --sheet: #1b2120;
    --ink: #e2e8e4;
    --ink-soft: #a7b3ae;
    --rule: #33403c;
    --blue: #7cc0dc;
    --blue-deep: #a6d6ea;
    --mark: #6e5c12;
    --mark-ink: #fff4c2;
    --ok: #79c08c;
    --bad: #e38a7c;
    --code-bg: #232b29;
    --term-bg: #0f1413;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue); text-underline-offset: 0.15em; }
a:hover { color: var(--blue-deep); }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; border-radius: 2px; }

code, kbd, pre, .hex { font-family: var(--mono); font-size: 0.86em; }
:not(pre) > code { background: var(--code-bg); padding: 0.08em 0.32em; border-radius: 3px; overflow-wrap: anywhere; }

/* ---------- top bar ---------- */

.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 1.25rem;
  padding: 0.7rem clamp(1rem, 4vw, 2.5rem);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--rule);
}
.wordmark { display: flex; align-items: baseline; gap: 0.5rem; text-decoration: none; color: var(--ink); }
.wordmark b { font-size: 1.35rem; font-weight: 700; letter-spacing: 0.01em; }
.wordmark span { font-family: var(--mono); font-size: 0.8rem; color: var(--ink-soft); }
.topbar nav { display: flex; gap: 1.1rem; margin-left: auto; font-size: 0.95rem; }
.topbar nav a { color: var(--ink-soft); text-decoration: none; }
.topbar nav a:hover { color: var(--ink); text-decoration: underline; }
.topbar .actions { display: flex; gap: 0.6rem; }
@media (max-width: 900px) { .topbar nav { display: none; } .topbar .actions { margin-left: auto; } }

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

.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.55rem 1rem;
  border: 1.5px solid var(--ink);
  border-radius: 4px;
  font: 600 0.95rem/1.2 var(--serif);
  color: var(--ink); background: transparent;
  text-decoration: none; cursor: pointer;
}
.btn:hover { background: var(--sheet); color: var(--ink); }
.btn-primary { background: var(--blue); border-color: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-deep); border-color: var(--blue-deep); color: #fff; }
@media (prefers-color-scheme: dark) { .btn-primary, .btn-primary:hover { color: #0d1514; } }
.btn svg { width: 1.05em; height: 1.05em; flex: none; }
.btn .count { font-family: var(--mono); font-size: 0.8rem; font-weight: 500; padding-left: 0.5rem; border-left: 1px solid currentColor; }
.btn .count:empty { display: none; }
.btn-small { padding: 0.35rem 0.75rem; font-size: 0.88rem; }

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

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
  max-width: 76rem;
  margin: 0 auto;
  padding: clamp(2.5rem, 7vw, 5.5rem) clamp(1rem, 4vw, 2.5rem) clamp(2rem, 5vw, 4rem);
}
.hero h1 { font-size: clamp(3rem, 7vw, 5.2rem); line-height: 0.95; margin: 0 0 1.25rem; font-weight: 700; letter-spacing: -0.02em; }
.hero .lede { font-size: 1.3rem; line-height: 1.5; margin: 0 0 1.25rem; max-width: 32rem; }
.hero .facts { margin: 0 0 1.75rem; padding: 0; list-style: none; color: var(--ink-soft); font-size: 1rem; }
.hero .facts li { padding-left: 1.1rem; position: relative; margin: 0.2rem 0; }
.hero .facts li::before { content: ""; position: absolute; left: 0; top: 0.68em; width: 0.45rem; height: 1.5px; background: var(--ink-soft); }
.hero .cta { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center; }
.hero .cta .meta { font-size: 0.9rem; color: var(--ink-soft); width: 100%; margin-top: 0.25rem; }
.hero .quick { margin-top: 1.75rem; }
@media (max-width: 960px) { .hero { grid-template-columns: minmax(0, 1fr); } }

/* ---------- byte inspector (the hero demo) ---------- */

.inspector {
  background: var(--sheet);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.1rem 1.2rem 1.2rem;
}
.inspector h2 { font-size: 1.05rem; margin: 0 0 0.2rem; }
.inspector .hint { margin: 0 0 0.9rem; font-size: 0.93rem; color: var(--ink-soft); }
.drop {
  border: 1.5px dashed var(--rule);
  border-radius: 5px;
  padding: 0.9rem;
  transition: border-color 0.15s, background 0.15s;
}
.drop.over { border-color: var(--blue); background: color-mix(in srgb, var(--blue) 7%, transparent); }
.filename { font-family: var(--mono); font-size: 0.82rem; color: var(--ink-soft); margin-bottom: 0.55rem; overflow-wrap: anywhere; }
.hexdump { font-family: var(--mono); font-size: clamp(0.6rem, 1.2vw, 0.76rem); line-height: 1.75; margin: 0; white-space: pre; overflow-x: auto; color: var(--ink-soft); }
.hexdump .off { color: var(--rule); }
@media (prefers-color-scheme: dark) { .hexdump .off { color: #50605b; } }
.hexdump mark { background: var(--mark); color: var(--mark-ink); border-radius: 2px; padding: 0 1px; }
.hexdump .skip { color: var(--ink-soft); font-style: italic; }
.verdict { margin-top: 0.9rem; padding-top: 0.8rem; border-top: 1px solid var(--rule); }
.verdict strong { font-size: 1.15rem; display: block; }
.verdict p { margin: 0.2rem 0 0; font-size: 0.95rem; }
.verdict code { white-space: normal; }
.inspector .pick { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; margin-top: 0.9rem; font-size: 0.9rem; color: var(--ink-soft); }
.inspector .pick label { cursor: pointer; }
.inspector .samples { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.inspector .samples button {
  font: 0.8rem var(--mono); padding: 0.15rem 0.45rem; border-radius: 3px;
  border: 1px solid var(--rule); background: transparent; color: var(--ink); cursor: pointer;
}
.inspector .samples button[aria-pressed="true"] { border-color: var(--blue); color: var(--blue); }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- documentation layout ---------- */

.doc {
  display: grid;
  grid-template-columns: 13.5rem minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  max-width: 76rem;
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2.5rem) 4rem;
  border-top: 1px solid var(--rule);
}
.toc { position: sticky; top: 4.5rem; align-self: start; padding-top: 2.5rem; font-size: 0.93rem; max-height: calc(100vh - 5rem); overflow-y: auto; }
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc li { margin: 0.1rem 0; }
.toc a { display: block; padding: 0.18rem 0 0.18rem 0.75rem; color: var(--ink-soft); text-decoration: none; border-left: 2px solid transparent; }
.toc a:hover { color: var(--ink); }
.toc a[aria-current="true"] { color: var(--ink); border-left-color: var(--blue); }
.toc ol ol a { padding-left: 1.5rem; font-size: 0.88rem; }
@media (max-width: 900px) { .doc { grid-template-columns: minmax(0, 1fr); } .toc { display: none; } }

main section { padding-top: 2.5rem; max-width: var(--measure); }
main section.wide { max-width: none; }
main section.wide > p, main section.wide > h2, main section.wide > h3, main section.wide > ul { max-width: var(--measure); }
main h2 { font-size: 2rem; line-height: 1.15; margin: 0 0 0.9rem; letter-spacing: -0.01em; }
main h3 { font-size: 1.28rem; margin: 2.1rem 0 0.6rem; }
main h4 { font-size: 1.05rem; margin: 1.5rem 0 0.4rem; }
main p { margin: 0 0 1rem; }
main ul, main ol { padding-left: 1.3rem; margin: 0 0 1rem; }
main li { margin: 0.25rem 0; }
.section-intro { font-size: 1.15rem; color: var(--ink-soft); }

/* ---------- code and terminal ---------- */

pre.code, pre.term {
  margin: 0 0 1.25rem;
  padding: 0.95rem 1.1rem;
  border-radius: 5px;
  overflow-x: auto;
  line-height: 1.55;
  font-size: 0.84rem;
}
pre.code { background: var(--code-bg); color: var(--ink); }
pre.term { background: var(--term-bg); color: var(--term-ink); }
pre.term .p { color: var(--term-dim); user-select: none; }
pre.term .c { color: #f2d37a; }
pre.term .ok { color: #8fd19e; }
pre.term .bad { color: #f0a090; }
pre.code .k { color: var(--blue); font-weight: 600; }
pre.code .s { color: var(--ok); }
pre.code .cm { color: var(--ink-soft); font-style: italic; }
.copy-wrap { position: relative; }
.copy-wrap .copy {
  position: absolute; top: 0.45rem; right: 0.45rem;
  font: 0.75rem var(--serif); padding: 0.15rem 0.5rem; border-radius: 3px; cursor: pointer;
  border: 1px solid currentColor; background: transparent; color: inherit; opacity: 0.65;
}
.copy-wrap .copy:hover, .copy-wrap .copy:focus-visible { opacity: 1; }
.copy-wrap pre.term + .copy { color: var(--term-ink); }

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

.table-wrap { overflow-x: auto; margin: 0 0 1.5rem; border: 1px solid var(--rule); border-radius: 5px; background: var(--sheet); }
table { border-collapse: collapse; width: 100%; font-size: 0.93rem; }
th, td { text-align: left; padding: 0.5rem 0.75rem; vertical-align: top; border-bottom: 1px solid var(--rule); }
thead th { font-weight: 600; background: var(--code-bg); position: sticky; top: 0; }
tbody tr:last-child td { border-bottom: none; }
td.yes { color: var(--ok); font-weight: 600; }
td.no { color: var(--ink-soft); }
td .hex { white-space: nowrap; }
tbody th { font-weight: 600; white-space: nowrap; }
thead th { white-space: nowrap; }
.formats td:nth-child(2), .formats td:nth-child(3) { white-space: nowrap; }

dl.ref { margin: 0 0 1.25rem; }
dl.ref dt { font-family: var(--mono); font-size: 0.9rem; font-weight: 600; margin-top: 0.9rem; }
dl.ref dd { margin: 0.15rem 0 0 1.25rem; }
dl.ref.plain dt { font-family: var(--serif); font-size: 1.02rem; }
dl.ref.plain dd { margin-top: 0; }

/* ---------- notes ---------- */

.note { border-left: 3px solid var(--blue); padding: 0.2rem 0 0.2rem 1rem; margin: 0 0 1.25rem; }
.note.warn { border-left-color: var(--bad); }
.note p:last-child { margin-bottom: 0; }

/* ---------- download block ---------- */

.release { display: flex; flex-wrap: wrap; gap: 1rem; align-items: baseline; margin-bottom: 1rem; }
.release .ver { font-size: 1.6rem; font-weight: 700; }
.release .date { color: var(--ink-soft); }

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

details { border-bottom: 1px solid var(--rule); padding: 0.7rem 0; }
details summary { cursor: pointer; font-weight: 600; }
details[open] summary { margin-bottom: 0.5rem; }
details p:last-child { margin-bottom: 0.2rem; }

/* ---------- star band and footer ---------- */

.star-band {
  max-width: 76rem; margin: 0 auto; padding: 2.5rem clamp(1rem, 4vw, 2.5rem);
  display: flex; flex-wrap: wrap; gap: 1.25rem; align-items: center; justify-content: space-between;
  border-top: 1px solid var(--rule);
}
.star-band p { margin: 0; font-size: 1.2rem; max-width: 40rem; }
footer { border-top: 1px solid var(--rule); padding: 1.5rem clamp(1rem, 4vw, 2.5rem) 2.5rem; color: var(--ink-soft); font-size: 0.9rem; }
footer .inner { max-width: 76rem; margin: 0 auto; display: flex; flex-wrap: wrap; gap: 0.5rem 2rem; justify-content: space-between; }

/* ---------- star reminder dialog ---------- */

dialog {
  border: 1px solid var(--rule); border-radius: 8px; padding: 1.5rem 1.6rem 1.3rem;
  max-width: 30rem; width: calc(100% - 2rem);
  background: var(--sheet); color: var(--ink);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.25);
}
dialog::backdrop { background: rgba(15, 22, 20, 0.45); }
dialog h2 { margin: 0 0 0.5rem; font-size: 1.35rem; }
dialog p { margin: 0 0 0.9rem; }
dialog .dl-file { font-family: var(--mono); font-size: 0.85rem; overflow-wrap: anywhere; }
dialog .buttons { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.2rem; }
dialog .fallback { font-size: 0.88rem; color: var(--ink-soft); margin: 0.9rem 0 0; }
@media (prefers-reduced-motion: no-preference) {
  dialog[open] { animation: rise 0.22s ease-out; }
  @keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
}

/* on narrow screens the copy button gets its own line above the code */
@media (max-width: 700px) { .copy-wrap pre.code, .copy-wrap pre.term { padding-top: 2.2rem; } }