/* pyalt.dev — palette and type derive from the pyAlt logo:
   charcoal #1a1a19, facet blues #5598e7/#3987e5/#1c5cab/#184f95,
   facet greens #1baf7a/#128a61; amber/red from the terminal demo. */

:root {
  --ink:    #151513;
  --panel:  #1d1d1b;
  --panel2: #242422;
  --edge:   #2e2e2b;
  --text:   #e9e6dc;
  --mute:   #a5a195;
  --dim:    #8a8578;
  --blue:   #3987e5;
  --blue-l: #5598e7;
  --blue-d: #1c5cab;
  --green:  #1baf7a;
  --green-l:#4ec695;
  --green-d:#128a61;
  --amber:  #e0a63f;
  --red:    #e66767;
  --mono: "IBM Plex Mono", "Cascadia Code", Consolas, ui-monospace, Menlo, monospace;
  --sans: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --w: 1040px;
}

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

body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue-l); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--blue-l);
  outline-offset: 2px;
  border-radius: 2px;
}

code, pre, kbd { font-family: var(--mono); }
p code, li code, td code {
  background: var(--panel2);
  border: 1px solid var(--edge);
  border-radius: 4px;
  padding: 0.08em 0.35em;
  font-size: 0.88em;
  color: var(--text);
}

.wrap { max-width: var(--w); margin: 0 auto; padding: 0 24px; }

/* ---- nav ------------------------------------------------------------- */

.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(21, 21, 19, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--edge);
}
.nav-inner {
  display: flex; align-items: center; gap: 28px;
  height: 58px;
}
.nav-brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-weight: 700; font-size: 20px;
  color: #fff;
}
.nav-brand:hover { text-decoration: none; }
.nav-brand .alt { color: var(--blue); }
.nav-brand svg { display: block; }
.nav-links {
  display: flex; gap: 22px; margin-left: auto;
  font-family: var(--mono); font-size: 14px;
}
.nav-links a { color: var(--mute); }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a.ext { color: var(--text); }

/* ---- section furniture ----------------------------------------------- */

section { padding: 72px 0 8px; }

.eyebrow {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 14px; letter-spacing: 0.04em;
  color: var(--mute); margin-bottom: 10px;
}
.facet { flex: none; }

h1, h2, h3 { font-family: var(--mono); line-height: 1.25; margin: 0 0 14px; }
h2 { font-size: 30px; font-weight: 700; }
h3 { font-size: 18px; font-weight: 600; }

.lede { max-width: 760px; color: var(--mute); margin: 0 0 28px; }
.lede strong, section p strong { color: var(--text); font-weight: 600; }
section > .wrap > p { max-width: 760px; }

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

.hero { padding: 64px 0 24px; }
.hero-grid {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
  gap: 48px; align-items: center;
}
.hero h1 {
  font-size: clamp(30px, 4.4vw, 44px);
  font-weight: 700; margin: 18px 0 18px;
}
.hero h1 .c-blue { color: var(--blue-l); }
.hero h1 .c-green { color: var(--green); }
.hero-logo img { display: block; width: 100%; max-width: 400px; height: auto; }
.hero-sub { color: var(--mute); max-width: 560px; margin: 0 0 30px; }
.hero-sub code { white-space: nowrap; }

.cta-row { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 26px; }
.btn {
  display: inline-block; font-family: var(--mono); font-size: 15px;
  padding: 12px 22px; border-radius: 6px; border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--green-d); color: #fff; border-color: var(--green); }
.btn-primary:hover { background: var(--green); }
.btn-ghost { color: var(--text); border-color: var(--edge); background: var(--panel); }
.btn-ghost:hover { border-color: var(--dim); }

.facts {
  display: flex; flex-wrap: wrap; gap: 8px 22px;
  font-family: var(--mono); font-size: 13px; color: var(--dim);
  padding: 0; margin: 0; list-style: none;
}
.facts li::before { content: "▸ "; color: var(--green); }

/* ---- terminal (race) -------------------------------------------------- */

.term {
  background: #1a1a19;
  border: 1px solid var(--edge);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
}
.term-tabbar {
  display: flex; align-items: stretch;
  background: #101010; border-bottom: 1px solid var(--edge);
  font-family: var(--mono); font-size: 12.5px;
}
.term-tab {
  display: flex; align-items: center; gap: 8px;
  background: #1a1a19; color: var(--mute);
  padding: 9px 16px; border-right: 1px solid var(--edge);
}
.term-tab .facet { transform: scale(0.8); }
.term-body { padding: 18px 20px 16px; font-family: var(--mono); font-size: 14px; }
.term-cmd { color: #fff; margin: 0 0 18px; min-height: 1.5em; }
.term-cmd .prompt { color: var(--green); }
.term-cmd .comment { color: var(--dim); }
.cursor {
  display: inline-block; width: 8px; height: 1.1em;
  background: var(--text); vertical-align: text-bottom;
  animation: blink 1.06s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .cursor { animation: none; } }

.race-row {
  display: grid; grid-template-columns: 118px 1fr 128px;
  gap: 12px; align-items: center; margin-bottom: 12px;
}
.race-name { color: var(--text); font-size: 13.5px; }
.race-track {
  height: 16px; background: var(--panel2); border-radius: 4px;
  overflow: hidden; position: relative;
}
.race-bar { height: 100%; width: 0; border-radius: 4px; }
.race-bar.b-py  { background: var(--blue); }
.race-bar.b-alt { background: var(--green); }
.race-bar.b-par { background: #c98500; }
.race-time { font-size: 13px; color: var(--mute); text-align: left; white-space: nowrap; }
.race-time strong { color: #fff; }
.race-time .running { color: var(--dim); animation: blink 1.2s steps(1) infinite; }

.term-out { color: var(--mute); font-size: 13px; margin: 16px 0 0; opacity: 0; transition: opacity 0.4s; }
.term-out.show { opacity: 1; }
.term-out .ok { color: var(--green-l); }
.term-foot {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--edge);
}
.term-note { font-size: 11.5px; color: var(--dim); font-family: var(--mono); }
.replay {
  font-family: var(--mono); font-size: 12.5px; color: var(--text);
  background: var(--panel2); border: 1px solid var(--edge); border-radius: 5px;
  padding: 6px 12px; cursor: pointer;
}
.replay:hover { border-color: var(--dim); }

/* to-scale strip */
.scale-strip { margin-top: 26px; }
.scale-row {
  display: grid; grid-template-columns: 118px 1fr; gap: 12px;
  align-items: center; margin-bottom: 7px;
  font-family: var(--mono); font-size: 12.5px; color: var(--mute);
}
.scale-bar { height: 9px; border-radius: 3px; min-width: 2px; }
.scale-note { font-family: var(--mono); font-size: 11.5px; color: var(--dim); margin-top: 8px; }

/* ---- code panels ------------------------------------------------------ */

.codepanel {
  background: var(--panel); border: 1px solid var(--edge); border-radius: 8px;
  overflow: hidden; margin: 22px 0;
}
.codepanel-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 14px; border-bottom: 1px solid var(--edge);
  font-family: var(--mono); font-size: 12.5px; color: var(--dim);
  background: var(--panel2);
}
.codepanel pre {
  margin: 0; padding: 16px 18px; overflow-x: auto;
  font-size: 13.5px; line-height: 1.6; color: var(--text);
}
.k  { color: var(--blue-l); }          /* keyword   */
.s  { color: var(--green-l); }         /* string    */
.n  { color: var(--amber); }           /* number    */
.c  { color: var(--dim); }             /* comment   */
.f  { color: #fff; font-weight: 600; } /* def name  */

.copybtn {
  font-family: var(--mono); font-size: 11.5px; color: var(--mute);
  background: none; border: 1px solid var(--edge); border-radius: 4px;
  padding: 3px 10px; cursor: pointer;
}
.copybtn:hover { color: var(--text); border-color: var(--dim); }
.copybtn.done { color: var(--green-l); border-color: var(--green-d); }

.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 26px 0; }
.compare .codepanel { margin: 0; }
.hl-line { background: rgba(57, 135, 229, 0.16); display: block; margin: 0 -18px; padding: 0 18px; }
.hl-line.hl-green { background: rgba(27, 175, 122, 0.16); }

/* error block — the compiler saying no */
.errpanel {
  border-left: 3px solid var(--red);
}
.errpanel pre { color: var(--mute); }
.err-loc { color: var(--text); }
.err-word { color: var(--red); font-weight: 600; }
.err-caret { color: var(--red); }

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

.tbl-wrap { overflow-x: auto; margin: 24px 0; }
table {
  border-collapse: collapse; width: 100%; min-width: 640px;
  font-size: 15px;
}
th, td { text-align: left; padding: 10px 16px; border-bottom: 1px solid var(--edge); }
th {
  font-family: var(--mono); font-size: 12.5px; font-weight: 500;
  color: var(--dim); letter-spacing: 0.04em;
}
td { color: var(--mute); }
td:first-child { color: var(--text); font-family: var(--mono); font-size: 14px; }
td strong { color: var(--text); }
tr.row-win td { background: rgba(27, 175, 122, 0.06); }

.aside {
  border-left: 3px solid var(--blue-d);
  background: var(--panel);
  padding: 14px 18px; border-radius: 0 8px 8px 0;
  color: var(--mute); font-size: 15.5px; max-width: 760px;
  margin: 24px 0;
}

/* ---- feature grid ----------------------------------------------------- */

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 26px 0; }
.grid2 .codepanel { margin: 0; }

.chips {
  display: flex; flex-wrap: wrap; gap: 10px;
  padding: 0; margin: 26px 0 0; list-style: none;
}
.chips li {
  font-family: var(--mono); font-size: 13px; color: var(--mute);
  background: var(--panel); border: 1px solid var(--edge);
  border-radius: 5px; padding: 6px 12px;
}
.chips code { background: none; border: none; padding: 0; color: var(--text); }

/* ---- differences list ------------------------------------------------- */

.difflist { padding: 0; margin: 26px 0; list-style: none; max-width: 780px; }
.difflist li {
  padding: 14px 0 14px 26px; border-bottom: 1px solid var(--edge);
  color: var(--mute); position: relative;
}
.difflist li::before {
  content: ""; position: absolute; left: 2px; top: 22px;
  width: 0; height: 0;
  border-left: 8px solid var(--amber);
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
}
.difflist strong { color: var(--text); }

/* ---- install ---------------------------------------------------------- */

.steps { counter-reset: step; padding: 0; margin: 30px 0; list-style: none; }
.steps > li { display: flex; gap: 18px; margin-bottom: 26px; }
.stepno {
  flex: none; width: 34px; height: 34px; border-radius: 6px;
  background: var(--panel2); border: 1px solid var(--edge);
  font-family: var(--mono); font-size: 15px; color: var(--blue-l);
  display: flex; align-items: center; justify-content: center;
  margin-top: 2px;
}
.stepbody { min-width: 0; flex: 1; }
.stepbody p { margin: 2px 0 10px; color: var(--mute); }
.stepbody .codepanel { margin: 10px 0 0; }
.sha {
  font-family: var(--mono); font-size: 12px; color: var(--dim);
  word-break: break-all; margin-top: 22px; max-width: 780px;
}
.sha code { background: none; border: none; padding: 0; color: var(--mute); }

/* ---- pipeline --------------------------------------------------------- */

.pipe {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 13.5px; margin: 28px 0;
}
.pipe-box {
  background: var(--panel); border: 1px solid var(--edge); border-radius: 6px;
  padding: 9px 14px; color: var(--text);
}
.pipe-box small { display: block; color: var(--dim); font-size: 11px; }
.pipe-box.pb-src { border-color: var(--blue-d); }
.pipe-box.pb-out { border-color: var(--green-d); }
.pipe-arrow { color: var(--dim); }
.pipe-fork { display: flex; flex-direction: column; gap: 8px; }

/* ---- roadmap / footer ------------------------------------------------- */

.roadmap { padding: 0; margin: 24px 0; list-style: none; max-width: 700px; }
.roadmap li {
  font-family: var(--mono); font-size: 14.5px; color: var(--mute);
  padding: 9px 0; border-bottom: 1px dashed var(--edge);
}
.roadmap li::before { content: "→ "; color: var(--blue); }
.roadmap li:first-child::before { color: var(--green); }

footer {
  margin-top: 90px; border-top: 1px solid var(--edge);
  padding: 34px 0 44px;
  font-family: var(--mono); font-size: 13px; color: var(--dim);
}
.foot-inner { display: flex; flex-wrap: wrap; gap: 12px 30px; align-items: center; }
.foot-inner a { color: var(--mute); }
.foot-inner a:hover { color: var(--text); }
.foot-spacer { flex: 1; }

/* ---- responsive ------------------------------------------------------- */

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .compare, .grid2 { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  section { padding: 54px 0 6px; }
  h2 { font-size: 24px; }
  .nav-links { gap: 14px; font-size: 13px; }
  .nav-links a.hide-sm { display: none; }
  .race-row { grid-template-columns: 92px 1fr; }
  .race-time { grid-column: 2; margin-top: -6px; }
  .scale-row { grid-template-columns: 92px 1fr; }
  .steps > li { gap: 12px; }
}