/* Freya Voice Settings Guide — apple-inspired, density-first.
   Accent: #5856d6 (freya purple). No frameworks, no CDN. */

:root {
  --accent: #5856d6;
  --accent-soft: #5856d617;
  --accent-line: #5856d633;
  --bg: #fbfbfd;
  --surface: #ffffff;
  --ink: #1d1d1f;
  --ink-2: #424245;
  --ink-3: #6e6e73;
  --hair: #d2d2d7;
  --hair-soft: #e8e8ed;
  --ok: #1a7f4b;
  --ok-soft: #1a7f4b14;
  --warn: #b25000;
  --warn-soft: #b2500014;
  --dead: #c2253c;
  --dead-soft: #c2253c12;
  --radius: 14px;
  --radius-sm: 9px;
  --maxw: 1080px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- top nav ---------- */
.topnav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 0 24px;
  height: 56px;
  background: rgba(251, 251, 253, 0.82);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--hair-soft);
}
.topnav .brand {
  font-weight: 600;
  letter-spacing: -0.01em;
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}
.topnav .brand b { color: var(--accent); }
.topnav .links {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
}
.topnav .links::-webkit-scrollbar { display: none; }
.topnav .links a {
  font-size: 13px;
  color: var(--ink-3);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 8px;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}
.topnav .links a:hover { color: var(--ink); background: var(--hair-soft); }
.topnav .links a.active { color: var(--accent); background: var(--accent-soft); font-weight: 600; }
.topnav .spacer { flex: 1; }

/* body[data-part] highlights the matching nav link via lib.js */

/* ---------- layout ---------- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.wide { max-width: 1240px; }

/* ---------- hero ---------- */
.hero {
  text-align: center;
  padding: 88px 24px 56px;
  background:
    radial-gradient(1200px 400px at 50% -120px, var(--accent-soft), transparent 70%);
}
.hero .eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.hero h1 {
  font-size: clamp(34px, 6vw, 58px);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 0 0 18px;
  font-weight: 700;
}
.hero p {
  font-size: clamp(17px, 2.4vw, 21px);
  color: var(--ink-2);
  max-width: 680px;
  margin: 0 auto 8px;
}
.hero .sub { font-size: 14px; color: var(--ink-3); margin-top: 18px; }
.hero .sub code { font-family: var(--mono); background: var(--surface); padding: 2px 7px; border-radius: 6px; border: 1px solid var(--hair); }

/* ---------- part header (subpages) ---------- */
.parthead {
  padding: 64px 24px 40px;
  border-bottom: 1px solid var(--hair-soft);
  background: radial-gradient(900px 300px at 0% -80px, var(--accent-soft), transparent 70%);
}
.parthead .kicker { font-size: 13px; font-weight: 600; color: var(--accent); letter-spacing: 0.03em; text-transform: uppercase; }
.parthead h1 { font-size: clamp(28px, 4.5vw, 42px); letter-spacing: -0.02em; margin: 10px 0 12px; }
.parthead p { font-size: 18px; color: var(--ink-2); max-width: 720px; margin: 0; }

/* ---------- section / step blocks ---------- */
section { padding: 28px 0; }
.step {
  background: var(--surface);
  border: 1px solid var(--hair-soft);
  border-radius: var(--radius);
  padding: 26px 28px;
  margin: 18px 0;
  box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}
.step h2, .step h3 { letter-spacing: -0.015em; }
.step h2 { font-size: 22px; margin: 0 0 6px; }
.step .stepno {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 2px 9px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.step p { color: var(--ink-2); margin: 10px 0; }
.step ul { color: var(--ink-2); padding-left: 20px; }
.step li { margin: 5px 0; }
h2, h3, h4 { color: var(--ink); }

/* spec row: key/range/default chips */
.spec {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0;
}
.spec .chip {
  font-family: var(--mono);
  font-size: 12px;
  padding: 5px 10px;
  border-radius: 8px;
  border: 1px solid var(--hair);
  background: #fff;
  color: var(--ink-2);
}
.spec .chip b { color: var(--ink); font-weight: 600; }
.spec .chip.key { border-color: var(--accent-line); color: var(--accent); }

/* labels */
.tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 2px 8px;
  border-radius: 6px;
  vertical-align: middle;
}
.tag.dead { color: var(--dead); background: var(--dead-soft); }
.tag.warn { color: var(--warn); background: var(--warn-soft); }
.tag.ok { color: var(--ok); background: var(--ok-soft); }

/* callouts */
.callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 14px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 16px 0;
  font-size: 15px;
  color: var(--ink-2);
}
.callout.dead { border-left-color: var(--dead); background: var(--dead-soft); }
.callout.warn { border-left-color: var(--warn); background: var(--warn-soft); }
.callout .h { display: block; font-weight: 600; color: var(--ink); margin-bottom: 4px; }

.ask {
  border: 1px dashed var(--accent-line);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin: 16px 0;
  font-size: 14px;
  color: var(--ink-2);
  background: #fff;
}
.ask .h { font-weight: 600; color: var(--accent); }
.ask code { font-family: var(--mono); font-size: 12.5px; background: var(--accent-soft); padding: 1px 5px; border-radius: 5px; }

/* symptom -> fix line */
.symptom { font-size: 14px; color: var(--ink-3); margin-top: 8px; }
.symptom b { color: var(--ink); }

/* ---------- demos ---------- */
.demo {
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, #fff, #fcfcfe);
  padding: 22px;
  margin: 20px 0;
}
.demo .demo-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.demo label { font-size: 13px; color: var(--ink-2); display: block; margin: 10px 0 4px; font-weight: 500; }
.demo .row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.demo input[type=range] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 4px; border-radius: 2px;
  background: var(--hair); outline: none; margin: 6px 0;
}
.demo input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent); cursor: pointer;
  border: 2px solid #fff; box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}
.demo input[type=range]::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent); cursor: pointer; border: 2px solid #fff;
}
.demo .readout {
  font-family: var(--mono); font-size: 13px;
  color: var(--accent); font-weight: 600;
  min-width: 64px; text-align: right;
}
.demo .verdict {
  margin-top: 14px; padding: 12px 16px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 500;
}
.demo .verdict.good { background: var(--ok-soft); color: var(--ok); }
.demo .verdict.bad { background: var(--dead-soft); color: var(--dead); }
.demo .verdict.neutral { background: var(--hair-soft); color: var(--ink-2); }
.demo select, .demo input[type=text], .demo textarea {
  font-family: var(--sans); font-size: 14px;
  padding: 8px 11px; border: 1px solid var(--hair);
  border-radius: 8px; background: #fff; color: var(--ink); width: 100%;
}
.demo textarea { min-height: 70px; resize: vertical; }
.demo .toggle-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 8px; }
.demo .tg {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 11px; border: 1px solid var(--hair); border-radius: 8px;
  font-size: 13px; cursor: pointer; user-select: none; background: #fff;
}
.demo .tg input { accent-color: var(--accent); }
.demo .out {
  font-family: var(--mono); font-size: 13px; line-height: 1.7;
  background: #1d1d1f; color: #e8e8ed; padding: 14px 16px;
  border-radius: var(--radius-sm); margin-top: 12px; white-space: pre-wrap; word-break: break-word;
}
.demo .out .hl { color: #ffd479; }

/* svg timeline / ladder */
.demo svg { width: 100%; height: auto; display: block; }
.demo .legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: 12px; color: var(--ink-3); margin-top: 10px; }
.demo .legend i { display: inline-block; width: 12px; height: 12px; border-radius: 3px; vertical-align: middle; margin-right: 5px; }

/* ---------- tables ---------- */
table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--hair-soft); vertical-align: top; }
th { font-size: 12px; text-transform: uppercase; letter-spacing: 0.03em; color: var(--ink-3); font-weight: 600; }
table.sortable thead th { cursor: pointer; user-select: none; white-space: nowrap; transition: color 0.15s; }
table.sortable thead th:hover, table.sortable thead th:focus-visible { color: var(--accent); outline: none; }
table.sortable thead th[aria-sort="ascending"], table.sortable thead th[aria-sort="descending"] { color: var(--accent); }
.sort-ind { font-size: 10px; color: var(--accent); }
td code, p code, li code { font-family: var(--mono); font-size: 12.5px; background: var(--hair-soft); padding: 1px 5px; border-radius: 5px; color: var(--ink); }

/* ---------- code block ---------- */
pre {
  background: #1d1d1f; color: #e8e8ed; padding: 16px 18px;
  border-radius: var(--radius-sm); overflow-x: auto; font-size: 13px; line-height: 1.6;
}
pre code { font-family: var(--mono); background: none; padding: 0; color: inherit; }

/* ---------- part cards (index) ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; margin: 28px 0; }
.card {
  display: block; text-decoration: none; color: inherit;
  background: var(--surface); border: 1px solid var(--hair-soft);
  border-radius: var(--radius); padding: 22px;
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 12px 28px rgba(0,0,0,0.08); border-color: var(--accent-line); }
.card .num { font-family: var(--mono); font-size: 12px; color: var(--accent); font-weight: 600; }
.card h3 { margin: 8px 0 6px; font-size: 18px; letter-spacing: -0.01em; }
.card p { font-size: 14px; color: var(--ink-3); margin: 0; }
.card .meta { margin-top: 12px; font-size: 12px; color: var(--ink-3); }

/* ---------- pipeline diagram (index) ---------- */
.pipeline {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: stretch;
  margin: 24px 0; justify-content: center;
}
.pstage {
  flex: 1 1 120px; min-width: 110px; max-width: 160px;
  border: 1px solid var(--hair); border-radius: var(--radius-sm);
  padding: 12px 10px; background: var(--surface); text-align: center;
  cursor: pointer; transition: border-color 0.15s, background 0.15s, transform 0.15s;
}
.pstage:hover, .pstage.active { border-color: var(--accent); background: var(--accent-soft); transform: translateY(-2px); }
.pstage .pname { font-size: 13px; font-weight: 600; }
.pstage .pgroup { font-size: 11px; color: var(--ink-3); margin-top: 3px; }
.pipeline-detail {
  margin-top: 8px; padding: 16px 18px; border-radius: var(--radius-sm);
  background: var(--accent-soft); font-size: 14px; color: var(--ink-2); min-height: 48px;
}

/* ---------- prev/next footer ---------- */
.partfoot {
  display: flex; justify-content: space-between; gap: 12px;
  margin: 40px 0 64px; padding-top: 24px; border-top: 1px solid var(--hair-soft);
}
.partfoot a {
  text-decoration: none; color: var(--ink); font-size: 14px;
  border: 1px solid var(--hair); border-radius: var(--radius-sm);
  padding: 12px 18px; transition: border-color 0.15s, background 0.15s; flex: 1; max-width: 48%;
}
.partfoot a:hover { border-color: var(--accent); background: var(--accent-soft); }
.partfoot a.next { text-align: right; }
.partfoot a .lbl { display: block; font-size: 11px; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.03em; }
.partfoot a.disabled { opacity: 0.4; pointer-events: none; }

/* ---------- footer ---------- */
.sitefoot { padding: 40px 24px 64px; text-align: center; color: var(--ink-3); font-size: 13px; border-top: 1px solid var(--hair-soft); }

/* ---------- scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

@media (max-width: 640px) {
  .topnav { gap: 12px; padding: 0 14px; }
  .step { padding: 20px 18px; }
  .partfoot { flex-direction: column; }
  .partfoot a { max-width: 100%; }
}