/*
 * Shared styles for the arctools site.
 *
 * No framework, no CDN, no build step: the site is plain files you can copy to
 * any web server. Everything is relative, so it works at a domain root or in a
 * subdirectory.
 */

:root {
  --bg: #fbfbfd;
  --panel: #ffffff;
  --panel-2: #f4f5f8;
  --line: #e3e5ea;
  --ink: #14161a;
  --ink-2: #3d424b;
  --dim: #63676f;
  --accent: #1f5fbf;
  --accent-soft: rgba(31, 95, 191, 0.09);
  --err: #b5301f;
  --warn: #94590a;
  --ok: #12683c;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --wrap: 940px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1016;
    --panel: #151920;
    --panel-2: #1b202a;
    --line: #262c37;
    --ink: #e7e9ed;
    --ink-2: #c2c7d0;
    --dim: #939aa5;
    --accent: #7cb0ff;
    --accent-soft: rgba(124, 176, 255, 0.12);
    --err: #ff8b80;
    --warn: #e8bd52;
    --ok: #5ed77f;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 var(--sans);
  font-synthesis-weight: none;
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 22px; }

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

.site-head {
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-head .wrap {
  display: flex;
  align-items: center;
  gap: 22px;
  min-height: 58px;
  flex-wrap: wrap;
}

.brand {
  font-weight: 660;
  letter-spacing: -0.015em;
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
  white-space: nowrap;
}

.brand span { color: var(--dim); font-weight: 400; }

.site-nav { display: flex; gap: 2px; margin-left: auto; flex-wrap: wrap; }

.site-nav a {
  color: var(--dim);
  text-decoration: none;
  font-size: 14px;
  padding: 6px 11px;
  border-radius: 7px;
  white-space: nowrap;
}

.site-nav a:hover { color: var(--ink); background: var(--panel-2); }
.site-nav a[aria-current="page"] { color: var(--ink); background: var(--accent-soft); font-weight: 550; }

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

.hero { padding: 62px 0 40px; border-bottom: 1px solid var(--line); }

.hero h1 {
  font-size: clamp(28px, 5.2vw, 42px);
  line-height: 1.15;
  letter-spacing: -0.028em;
  margin: 0 0 18px;
  font-weight: 680;
  max-width: 20ch;
}

.hero .lede {
  font-size: clamp(17px, 2.4vw, 19px);
  color: var(--ink-2);
  margin: 0 0 26px;
  max-width: 62ch;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
  margin: 0 0 14px;
}

/* ---------- content ---------- */

main { padding: 46px 0 72px; }

h2 {
  font-size: 23px;
  letter-spacing: -0.018em;
  margin: 52px 0 14px;
  font-weight: 640;
  scroll-margin-top: 74px;
}

h2:first-child { margin-top: 0; }

h3 {
  font-size: 17px;
  margin: 32px 0 10px;
  font-weight: 620;
  letter-spacing: -0.01em;
  scroll-margin-top: 74px;
}

p { margin: 0 0 16px; max-width: 72ch; }

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

ul, ol { max-width: 72ch; padding-left: 22px; }
li { margin-bottom: 7px; }

strong { font-weight: 620; }

code {
  font-family: var(--mono);
  font-size: 0.875em;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 5px;
}

pre {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 15px 17px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  margin: 0 0 20px;
}

pre code { background: none; border: 0; padding: 0; font-size: inherit; }

pre .c { color: var(--dim); }
pre .e { color: var(--err); }
pre .w { color: var(--warn); }
pre .g { color: var(--ok); }

blockquote {
  margin: 0 0 20px;
  padding: 2px 0 2px 16px;
  border-left: 3px solid var(--line);
  color: var(--ink-2);
}

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

.table-wrap { overflow-x: auto; margin: 0 0 22px; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}

th {
  text-align: left;
  font-weight: 580;
  font-size: 12px;
  letter-spacing: 0.045em;
  text-transform: uppercase;
  color: var(--dim);
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

td { padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
tbody tr:last-child td { border-bottom: 0; }
td code { white-space: nowrap; }

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

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(258px, 1fr));
  gap: 14px;
  margin: 0 0 26px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 19px 21px;
}

.card h3 { margin: 0 0 7px; font-size: 16px; }
.card p { margin: 0 0 12px; font-size: 14.5px; color: var(--ink-2); }
.card p:last-child { margin-bottom: 0; }

a.card { text-decoration: none; color: inherit; display: block; transition: border-color .12s, transform .12s; }
a.card:hover { border-color: var(--accent); transform: translateY(-1px); }
a.card h3 { color: var(--accent); }

/* ---------- stats ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
  gap: 13px;
  margin: 0 0 26px;
}

.stat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 11px;
  padding: 15px 17px;
}

.stat .n {
  font-size: 25px;
  font-weight: 640;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  line-height: 1.15;
}

.stat .l { color: var(--dim); font-size: 13px; margin-top: 5px; }

/* ---------- callout ---------- */

.note {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 9px;
  padding: 15px 18px;
  margin: 0 0 22px;
}

.note.warn { border-left-color: var(--warn); }
.note p:last-child { margin-bottom: 0; }
.note .t { font-weight: 620; margin-bottom: 5px; display: block; font-size: 14.5px; }

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

.actions { display: flex; gap: 10px; flex-wrap: wrap; margin: 0 0 8px; }

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  padding: 9px 17px;
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 550;
  border: 1px solid transparent;
}

.btn:hover { filter: brightness(1.08); }

.btn.ghost { background: transparent; color: var(--accent); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--accent); filter: none; }

/* ---------- misc ---------- */

.pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11.5px;
  padding: 2px 8px;
  border-radius: 20px;
  border: 1px solid var(--line);
  color: var(--dim);
  background: var(--panel-2);
  white-space: nowrap;
}

.sev-error { color: var(--err); font-weight: 560; }
.sev-warning { color: var(--warn); font-weight: 560; }
.sev-info { color: var(--accent); font-weight: 560; }

.lead-in { color: var(--dim); font-size: 14.5px; margin-top: -6px; }

hr { border: 0; border-top: 1px solid var(--line); margin: 44px 0; }

.site-foot {
  border-top: 1px solid var(--line);
  background: var(--panel);
  padding: 26px 0;
  color: var(--dim);
  font-size: 14px;
}

.site-foot .wrap { display: flex; gap: 16px; flex-wrap: wrap; align-items: baseline; }
.site-foot a { color: var(--dim); }
.site-foot .right { margin-left: auto; font-family: var(--mono); font-size: 12.5px; }

@media (max-width: 620px) {
  .hero { padding: 40px 0 30px; }
  .site-nav { margin-left: 0; width: 100%; }
  .site-head .wrap { padding-top: 10px; padding-bottom: 10px; }
}