/* BulkSeq Studio documentation — professional editorial design system.
   Type trio: EB Garamond (reading content) + Inter (UI chrome) + IBM Plex Mono (code).
   Near-neutral base, ink text, one deep accent (links / active-nav / icon strokes). */

:root {
  /* palette — neutral + deep indigo (variant C) */
  --bg: #f7f7fb;
  --surface: #ffffff;
  --text: #14151b;
  --muted: #585b6b;
  --border: #e6e6ef;
  --border-strong: #d6d6e3;
  --accent: #4338ca;
  --accent-2: #3730a3;
  --accent-tint: #ecebfb;
  --code-bg: #15162a;
  --code-text: #e8e8f5;

  --font-serif: "EB Garamond", Georgia, "Times New Roman", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", monospace;

  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(17,24,39,.04);
  --shadow: 0 1px 2px rgba(17,24,39,.04), 0 10px 28px rgba(17,24,39,.05);
  --sidebar-w: 280px;
  --measure: 82ch;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 1.5rem; -webkit-text-size-adjust: 100%; }
html, body { overflow-x: hidden; max-width: 100%; }
body {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.72;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
/* break only genuinely long tokens (filename, URL, locus id); normal words wrap at spaces.
   word-break:break-word shattered normal words letter-by-letter in narrow table cells. */
p, li, figcaption, .note, td, th, h1, h2, h3, h4 { overflow-wrap: break-word; }
img { max-width: 100%; height: auto; }

/* ---------- layout ---------- */
.layout { display: flex; align-items: flex-start; }
.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 1.7rem 1.3rem 2rem;
}
.content {
  flex: 1 1 auto; min-width: 0;
  padding: 3rem clamp(1.2rem, 5vw, 4.5rem) 5rem;
}
/* centred content column at a comfortable width: caps on wide monitors (so it does not sprawl),
   and goes full-width on phones (max-width never forces overflow on a small screen) */
.content section { max-width: 48rem; margin: 0 auto; padding-bottom: 3.6rem; }
.content section + section { border-top: 1px solid var(--border); padding-top: 3.4rem; }
.content section.wide { max-width: 68rem; }
#overview { border-top: none; padding-top: 0; }

/* ---------- sidebar (sans UI) ---------- */
.brand { display: flex; align-items: center; gap: .55rem; margin-bottom: .35rem; text-decoration: none; color: var(--text); }
.brand img { width: 30px; height: 30px; }
.brand b { font-family: var(--font-sans); font-size: 1.12rem; font-weight: 600; letter-spacing: -.01em; }
.brand .ver { font-family: var(--font-mono); font-size: .64rem; color: var(--accent-2); background: var(--accent-tint);
  padding: .12rem .4rem; border-radius: 5px; margin-left: .3rem; vertical-align: middle; font-weight: 500; }
.tagline { font-family: var(--font-sans); color: var(--muted); font-size: .82rem; line-height: 1.5; margin: 0 0 1.3rem; }
.nav { list-style: none; margin: 0; padding: 0; font-family: var(--font-sans); font-size: .9rem; }
.nav a { display: block; padding: .4rem .7rem; color: var(--muted); text-decoration: none; border-radius: 7px; font-weight: 450; transition: color .12s, background .12s; }
.nav a:hover { background: #eef2f1; color: var(--text); }
.nav a.active { color: var(--accent-2); background: var(--accent-tint); font-weight: 600; }
.sidebar .ext { margin-top: 1.4rem; padding-top: 1.1rem; border-top: 1px solid var(--border); font-family: var(--font-sans); font-size: .82rem; }
.sidebar .ext a { color: var(--muted); display: block; padding: .28rem 0; text-decoration: none; font-weight: 450; }
.sidebar .ext a:hover { color: var(--accent); }

/* ---------- hero (no color band; type + the screenshot carry it) ---------- */
.hero { padding: .5rem 0 2.2rem; margin-bottom: 2.6rem; border-bottom: 1px solid var(--border); }
.hero h1 { font-size: clamp(2.6rem, 5vw, 3.5rem); line-height: 1.04; letter-spacing: -.015em; font-weight: 600; margin: .4rem 0 .7rem; }
.hero > p { font-family: var(--font-sans); font-size: 1.16rem; line-height: 1.55; color: var(--muted); max-width: 56ch; margin: 0 0 1.5rem; font-weight: 400; }
.hero .badges { display: flex; flex-wrap: wrap; gap: .45rem; margin-bottom: 1.5rem; }
.hero .badge { font-family: var(--font-sans); font-size: .76rem; font-weight: 500; color: var(--muted);
  background: var(--surface); border: 1px solid var(--border-strong); border-radius: 999px; padding: .28rem .75rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: .65rem; }
.btn { display: inline-flex; align-items: center; gap: .4rem; font-family: var(--font-sans); font-size: .94rem; font-weight: 550;
  padding: .62rem 1.2rem; border-radius: 8px; text-decoration: none; border: 1px solid transparent; transition: background .12s, border-color .12s; }
.btn-primary, .content .btn-solid { background: var(--accent); color: #fff; }
.btn-primary:hover, .content .btn-solid:hover { background: var(--accent-2); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border-strong); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-2); }

/* ---------- typography ---------- */
.kicker { font-family: var(--font-sans); font-size: .73rem; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin: 0 0 .5rem; }
h2 { font-size: clamp(1.7rem, 3vw, 2.05rem); font-weight: 600; line-height: 1.15; letter-spacing: -.01em; margin: 0 0 1rem; }
h3 { font-size: 1.32rem; font-weight: 600; margin: 2rem 0 .5rem; letter-spacing: -.005em; }
h4 { font-family: var(--font-sans); font-size: 1.02rem; font-weight: 600; margin: 1.3rem 0 .35rem; color: var(--text); letter-spacing: -.005em; }
p, li { color: var(--text); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }
.lead { font-size: 1.2rem; line-height: 1.6; color: var(--muted); }
.muted { color: var(--muted); }
em { font-style: italic; }

/* ---------- code ---------- */
code { font-family: var(--font-mono); font-size: .82em; background: #eef1f0; padding: .12em .38em; border-radius: 5px; color: #134237; border: 1px solid var(--border); overflow-wrap: anywhere; }
pre { background: var(--code-bg); color: var(--code-text); border-radius: var(--radius); padding: 1rem 1.15rem; overflow-x: auto; box-shadow: var(--shadow-sm); }
pre code { font-family: var(--font-mono); font-size: .8rem; line-height: 1.6; background: none; color: inherit; padding: 0; border: none; }

/* ---------- cards / grids ---------- */
.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); margin: 1.4rem 0; }
.grid.cols-2 { grid-template-columns: repeat(auto-fit, minmax(310px, 1fr)); }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.3rem 1.4rem; box-shadow: var(--shadow-sm); }
.card.feature { transition: border-color .14s, box-shadow .14s, transform .14s; }
.card.feature:hover { border-color: var(--border-strong); box-shadow: var(--shadow); transform: translateY(-2px); }
.card.feature h4 { display: flex; align-items: center; gap: .65rem; margin: 0 0 .5rem; font-size: 1.04rem; }
.card.feature p { margin: 0; font-size: .97rem; line-height: 1.55; color: var(--muted); }
/* feature icon: real SVG line-icon in a tinted square */
svg.ic { width: 38px; height: 38px; flex: 0 0 38px; padding: 8px; border-radius: 9px; background: var(--accent-tint); color: var(--accent); }

/* ---------- callouts ---------- */
.note { font-family: var(--font-sans); font-size: .92rem; line-height: 1.55; border: 1px solid var(--border); border-left: 3px solid var(--accent);
  background: var(--surface); padding: .85rem 1.1rem; border-radius: 0 8px 8px 0; margin: 1.3rem 0; color: var(--muted); }
.note.warn { border-left-color: #d08700; }
.note .t { font-weight: 600; color: var(--text); margin-right: .15rem; }

/* ---------- steps ---------- */
ol.steps { list-style: none; counter-reset: step; padding: 0; margin: 1.5rem 0; }
ol.steps > li { counter-increment: step; position: relative; padding: 0 0 1.5rem 3.1rem; }
ol.steps > li::before { content: counter(step); position: absolute; left: 0; top: 0; width: 2rem; height: 2rem;
  background: var(--surface); border: 1.5px solid var(--accent); color: var(--accent-2); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-family: var(--font-sans); font-size: .9rem; font-weight: 600; }
ol.steps > li::after { content: ""; position: absolute; left: 1rem; top: 2.2rem; bottom: .2rem; width: 1.5px; background: var(--border); }
ol.steps > li:last-child::after { display: none; }
ol.steps > li h4 { margin: .2rem 0 .3rem; }
ol.steps > li p { margin: 0; }

/* ---------- tables (sans) ---------- */
.tablewrap { overflow-x: auto; margin: 1.3rem 0; border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-sm); width: max-content; max-width: 100%; }
table { border-collapse: collapse; width: auto; max-width: 100%; font-family: var(--font-sans); font-size: .88rem; background: var(--surface); }
th, td { text-align: left; padding: .6rem .85rem; border-bottom: 1px solid var(--border); }
thead th { background: #f1f4f3; color: var(--text); font-weight: 600; font-size: .8rem; letter-spacing: .01em; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: #f8faf9; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

/* ---------- figures ---------- */
figure { margin: 1.6rem 0; }
figure img { width: 100%; height: auto; border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); background: #fff; }
figure.bench img { box-shadow: var(--shadow-sm); }
figcaption { font-family: var(--font-sans); color: var(--muted); font-size: .85rem; line-height: 1.5; margin-top: .65rem; }
/* inline pipeline diagram (SVG rendered as a live vector object, not a raster image) */
figure.diagram { margin: 1.8rem 0; }
figure.diagram object { width: 100%; height: auto; display: block; border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-sm); background: #fff; padding: .6rem; box-sizing: border-box; }

/* ---------- misc ---------- */
.pill { font-family: var(--font-mono); font-size: .72rem; padding: .12rem .5rem; border-radius: 5px; background: var(--accent-tint); color: var(--accent-2); }
hr { border: none; border-top: 1px solid var(--border); margin: 2.6rem 0; }
.footer { font-family: var(--font-sans); font-size: .85rem; line-height: 1.6; color: var(--muted); border-top: 1px solid var(--border); padding-top: 1.6rem; margin-top: 1rem; }
strong { font-weight: 600; }

/* ---------- mobile ---------- */
.menu-toggle { display: none; }
@media (max-width: 880px) {
  /* plain block stack on mobile: a flex column kept align-items:flex-start from the
     desktop rule, which sized the children to content width and overflowed the viewport */
  .layout { display: block; width: 100%; }
  .sidebar { position: static; height: auto; width: 100%; max-width: 100%; border-right: none; border-bottom: 1px solid var(--border); padding: 1.1rem 1.2rem; }
  .content { display: block; width: 100%; max-width: 100%; padding: 2rem 1.2rem 3.5rem; }
  .content section, .content section.wide { max-width: 100%; }
  /* collapsed nav -> reveal both links and external links together */
  .nav, .sidebar .ext { display: none; }
  .nav.open, .nav.open ~ .ext { display: block; }
  .nav.open { margin-top: .6rem; }
  .nav.open ~ .ext { margin-top: .8rem; }
  /* full-width menu bar with comfortable tap targets on the collapsed nav */
  .menu-toggle { display: block; width: 100%; text-align: left; margin-top: .8rem; font-family: var(--font-sans);
    font-size: .95rem; font-weight: 600; background: var(--accent); color: #fff; border: none;
    padding: .62rem .9rem; border-radius: 8px; cursor: pointer; }
  .nav.open a { padding: .62rem .75rem; font-size: .96rem; border-radius: 8px; }
  .sidebar .ext a { padding: .5rem 0; font-size: .9rem; }
  /* stack all multi-column grids */
  .grid, .grid.cols-2 { grid-template-columns: 1fr; }
  .hero { padding: .25rem 0 1.8rem; }
  .hero h1 { font-size: 2.15rem; }
  .hero > p { font-size: 1.05rem; }
  .btn { flex: 1 1 auto; justify-content: center; }
  pre { font-size: .92em; }
  body { font-size: 18px; }
  /* wide tables scroll horizontally inside .tablewrap rather than crushing columns
     (a fitted width squeezed cells so tight that normal words broke letter-by-letter) */
  .tablewrap { -webkit-overflow-scrolling: touch; }
  .tablewrap table { min-width: 34rem; width: max-content; max-width: none; }
  table { font-size: .84rem; }
  th, td { padding: .5rem .65rem; }
}

/* ---------- image lightbox ---------- */
/* full-screen zoomable viewer for <figure> images; wired by assets/lightbox.js.
   Reuses the site tokens (--surface, --border, --radius, --accent) for controls. */
html.lb-lock, body.lb-lock { overflow: hidden; }

.lb-overlay {
  position: fixed; inset: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: center;
  background: rgba(10, 12, 20, 0.86);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  opacity: 0;
  transition: opacity .18s ease;
}
.lb-overlay.lb-open { opacity: 1; }
.lb-overlay[hidden] { display: none; }

.lb-stage {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
  touch-action: none;              /* let JS handle wheel/pan/pinch */
}
.lb-img {
  max-width: 94vw; max-height: 90vh;
  width: auto; height: auto;
  transform-origin: 0 0;           /* zoom math in lightbox.js assumes top-left origin */
  border-radius: 6px;
  box-shadow: 0 18px 60px rgba(0, 0, 0, .55);
  background: #fff;
  cursor: zoom-out;
  user-select: none; -webkit-user-select: none;
  -webkit-user-drag: none;
  will-change: transform;
}

/* controls styled like the site's buttons (surface chip, accent on hover) */
.lb-controls {
  position: absolute; left: 50%; bottom: 1.1rem; transform: translateX(-50%);
  display: flex; gap: .4rem; z-index: 2;
  background: rgba(20, 21, 27, .55); border-radius: 999px; padding: .3rem;
}
.lb-btn {
  font-family: var(--font-sans);
  display: inline-flex; align-items: center; justify-content: center;
  width: 2.3rem; height: 2.3rem; line-height: 1;
  font-size: 1.3rem; font-weight: 500;
  color: #fff; background: rgba(255, 255, 255, .12);
  border: 1px solid rgba(255, 255, 255, .22); border-radius: 999px;
  cursor: pointer; transition: background .12s, border-color .12s, color .12s;
}
.lb-btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.lb-btn:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
.lb-close {
  position: absolute; top: 1rem; right: 1rem; z-index: 3;
  font-size: 1.6rem;
}

.lb-hint {
  position: absolute; top: 1rem; left: 1rem; z-index: 2;
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .01em;
  color: rgba(255, 255, 255, .78);
  background: rgba(20, 21, 27, .5);
  padding: .3rem .6rem; border-radius: 6px;
  pointer-events: none;
}
.lb-caption {
  position: absolute; left: 50%; bottom: 4.2rem; transform: translateX(-50%);
  z-index: 2; max-width: min(80ch, 90vw); text-align: center;
  font-family: var(--font-sans); font-size: .85rem; line-height: 1.5;
  color: rgba(255, 255, 255, .9);
  background: rgba(20, 21, 27, .5);
  padding: .5rem .9rem; border-radius: 8px;
  pointer-events: none;
}

/* the small "view full size" link inside the SVG diagram's caption */
.diagram-fullsize { font-family: var(--font-sans); white-space: nowrap; }

@media (prefers-reduced-motion: reduce) {
  .lb-overlay { transition: none; }
  .lb-img { will-change: auto; }
}

@media (max-width: 880px) {
  .lb-img { max-width: 96vw; max-height: 84vh; }
  .lb-caption { bottom: 4.4rem; font-size: .8rem; max-width: 92vw; }
}

/* ---------- dark mode toggle button ---------- */
.theme-toggle {
  display: inline-flex; align-items: center; gap: .35rem;
  margin-top: 1.4rem; font-family: var(--font-sans); font-size: .8rem; font-weight: 500;
  color: var(--muted); background: var(--surface);
  border: 1px solid var(--border-strong); border-radius: 999px;
  padding: .38rem .85rem; cursor: pointer;
  transition: border-color .12s, color .12s, background .12s;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent-2); }
.theme-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
@media (max-width: 880px) { .theme-toggle { margin-top: 1rem; } }

/* ---------- dark theme (html[data-theme="dark"]) ---------- */
html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1116;
  --surface: #171a22;
  --text: #e7e9f0;
  --muted: #9aa1b2;
  --border: #262a35;
  --border-strong: #373c49;
  --accent: #a6adff;
  --accent-2: #c6cbff;
  --accent-tint: #20233a;
  --code-bg: #0c0e18;
  --code-text: #e8e8f5;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.45);
  --shadow: 0 1px 2px rgba(0,0,0,.45), 0 10px 28px rgba(0,0,0,.55);
}
html[data-theme="dark"], html[data-theme="dark"] body { background: var(--bg); }
/* recolour the few hardcoded light surfaces so they read on a dark page */
html[data-theme="dark"] .nav a:hover { background: #1e2230; color: var(--text); }
html[data-theme="dark"] thead th { background: #1e2230; }
html[data-theme="dark"] tbody tr:hover { background: #1b1f2a; }
html[data-theme="dark"] code { background: #1b1f2b; color: #cdd4ff; }
/* buttons: the accent is light on dark (good for links), so give filled buttons a mid indigo
   with white text instead, and stop the hover from washing to near-white */
html[data-theme="dark"] .btn-primary,
html[data-theme="dark"] .content .btn-solid,
html[data-theme="dark"] .menu-toggle { background: #5860d6; color: #fff; }
html[data-theme="dark"] .btn-primary:hover,
html[data-theme="dark"] .content .btn-solid:hover { background: #6f77e6; }
html[data-theme="dark"] .btn-ghost { background: var(--surface); color: var(--text); }