/* Normalled Jackfield — dark instrument, one signal amber, state by stroke pattern not hue.
   CVD-legible by construction: every state is a shape/label, never a color alone. */

:root {
  --glass: #0b0d10;
  --panel: #12151a;
  --panel2: #1a1f26;
  --edge: #1d232b;
  --edge2: #232a33;
  --amber: #f5a623;
  --ink: #e8eef4;
  --text: #c4ced8;
  --muted: #7a8896;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --idle: #3a4450;
  --code: #ffd28a;
  --link-under: #6b4a12;
  --imgwell: #ffffff;
}

/* Light mode: same grammar (amber accent, pattern-over-hue), light surface. */
[data-theme="light"] {
  --glass: #f4f1ea;
  --panel: #ffffff;
  --panel2: #efece4;
  --edge: #d9d2c2;
  --edge2: #cfc7b6;
  --amber: #b06a00;
  --ink: #1c1a15;
  --text: #33383d;
  --muted: #6b7280;
  --idle: #c3bcab;
  --code: #8a4a00;
  --link-under: #d8b06a;
  --imgwell: #ffffff;
}

/* the toggle button (top-right, fixed) */
.themeswitch {
  position: fixed;
  top: 14px;
  right: 16px;
  z-index: 40;
  font: 600 11px var(--mono);
  letter-spacing: 0.08em;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--edge2);
  border-radius: 6px;
  padding: 8px 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.themeswitch:hover { color: var(--amber); border-color: var(--amber); }
.themeswitch .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--amber); display: inline-block; }
@media (max-width: 860px) { .themeswitch { top: 14px; right: 16px; } }

* { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  overflow-y: scroll;   /* always show the scrollbar gutter so layout width is constant page-to-page */
}
body {
  margin: 0;
  background: var(--glass);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
}

/* ---- left legend strip: lane-numbered nav, state via rail stroke pattern ---- */
.lanes {
  width: 224px;
  background: var(--panel);
  border-right: 1px solid var(--edge);
  position: fixed;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 22px 0;
  z-index: 10;
  /* hug the right edge of the left half, so the nav sits directly against the content column */
  left: 0;
}
@media (min-width: 861px) {
  /* Center the nav+content unit. When the window is at least 1004px wide, the unit is
     centered (block center at 50%). When narrower, the unit is left-pinned at 0 and the
     content column shrinks to fit — so the nav never goes off-screen and the seam holds. */
  .lanes { left: max(0px, calc(50% - 502px)); transform: none; }
}
.brand {
  font: 700 12px var(--mono);
  letter-spacing: 0.18em;
  color: var(--amber);
  padding: 0 20px 18px;
  border-bottom: 1px solid var(--edge);
  line-height: 1.5;
}
.brand .sub { color: var(--muted); font-weight: 400; letter-spacing: 0.1em; font-size: 10px; }

/* Each lane is a fixed-height row; the three cells are pinned to absolute x offsets
   that never move regardless of font load, glyph count, or engine. No reflow possible. */
.lane {
  position: relative;
  display: block;
  height: 36px;
  color: #aeb9c4;
  text-decoration: none;
  font-size: 13.5px;
}
.lane .ln, .lane .rail, .lane .lbl { position: absolute; top: 50%; transform: translateY(-50%); }
.lane .ln {
  left: 16px;
  width: 34px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  text-align: right;
  font-variant-numeric: tabular-nums;
  overflow: hidden;
  white-space: nowrap;
}
.lane .rail {
  left: 60px;             /* 16 + 34 + 10 gap */
  width: 26px;
  height: 3px;
  background: #3a4450; /* unbroken = present, idle */
}
.lane .lbl {
  left: 96px;             /* 60 + 26 + 10 gap */
  right: 14px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.lane:hover .rail { background: repeating-linear-gradient(90deg, var(--amber) 0 5px, transparent 5px 8px); }
.lane.cur { color: var(--amber); }
.lane.cur .rail { /* doubled = selected */
  background: var(--amber);
  box-shadow: 0 5px 0 var(--amber);
}

/* ---- main field ---- */
.field {
  width: 100%;
  max-width: 780px;
  margin: 0 auto;           /* fallback centering (mobile/short) */
  padding: 44px 42px 120px;
}
@media (min-width: 861px) {
  /* Content sits immediately right of the nav (nav is 224 wide at max(0, 50%-502)).
     Content left edge = nav right edge. Width = 780, but shrink if the window is narrow. */
  .field {
    position: relative;
    left: max(224px, calc(50% - 502px + 224px));
    transform: none;
    margin: 0;
    width: auto;
    max-width: min(780px, calc(100vw - max(224px, calc(50% - 502px + 224px)) - 24px));
  }
}
.crumb {
  font: 11px var(--mono);
  letter-spacing: 0.14em;
  color: var(--muted);
  margin-bottom: 12px;
}
.article h1 {
  font-size: 30px;
  letter-spacing: -0.01em;
  color: var(--ink);
  font-weight: 700;
  margin: 0 0 6px;
  line-height: 1.15;
}
.rule { /* amber ticked rule */
  height: 3px;
  background: repeating-linear-gradient(90deg, var(--amber) 0 14px, transparent 14px 20px);
  margin: 12px 0 24px;
}

/* ---- content typography ---- */
.article h2 {
  font-size: 21px;
  color: var(--amber);
  letter-spacing: 0.01em;
  margin: 34px 0 8px;
  font-weight: 650;
}
.article h3 {
  font-size: 16.5px;
  color: var(--ink);
  margin: 28px 0 6px;
  font-weight: 650;
}
.article h4 { font-size: 14px; color: var(--ink); margin: 22px 0 4px; font-weight: 650; }
.article p { margin: 12px 0; }
.article a { color: var(--amber); text-decoration: underline; text-underline-offset: 3px; text-decoration-color: #6b4a12; }
.article a:hover { color: #ffc95e; }
.article strong { color: var(--ink); }
.article ul, .article ol { padding-left: 22px; margin: 12px 0; }
.article li { margin: 5px 0; }
.article blockquote {
  margin: 18px 0;
  padding: 12px 16px;
  border-left: 3px solid var(--amber);
  background: var(--panel);
  color: var(--text);
}
.article blockquote p { margin: 6px 0; }
.article hr { border: 0; border-top: 1px solid var(--edge); margin: 34px 0; }

/* code: amber on dark well, but always paired with text (never hue-only) */
.article code {
  font: 13px var(--mono);
  background: var(--panel2);
  border: 1px solid var(--edge2);
  padding: 1px 6px;
  border-radius: 3px;
  color: #ffd28a;
}
.article pre {
  background: var(--panel2);
  border: 1px solid var(--edge2);
  border-radius: 6px;
  padding: 14px 16px;
  overflow-x: auto;
  margin: 18px 0;
}
.article pre code { background: none; border: 0; padding: 0; color: var(--text); }

/* tables: hairline, tabular numerals, readable on black glass */
.article table {
  border-collapse: collapse;
  width: 100%;
  margin: 18px 0;
  font-size: 14px;
  display: block;
  overflow-x: auto;
}
.article th, .article td {
  border: 1px solid var(--edge2);
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}
.article thead th {
  font: 650 12px var(--mono);
  letter-spacing: 0.06em;
  color: var(--amber);
  background: var(--panel);
  border-bottom: 2px solid var(--amber);
}
.article tbody tr:hover { background: var(--panel); }
.article td code { font-size: 12px; }

/* Swatch plates carry their own mode-matched background (baked into the SVG), so the
   img well is transparent and just frames it. Editor mocks are transparent and float. */
.article img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 18px 0;
  border: 1px solid var(--edge2);
  border-radius: 6px;
  padding: 0;
  background: transparent; /* the SVG supplies its own surface */
}
.article img.editor, .article img[src*="-editor"] {
  border-color: transparent;  /* editor mocks get no frame */
}

/* responsive: collapse the rail to a top strip on narrow frames */
/* ---- hamburger toggle (narrow viewports) ---- */
.navtoggle { display: none; }
.hamburger {
  display: none;
  position: fixed;
  top: 14px;
  left: 16px;
  z-index: 30;
  width: 42px;
  height: 42px;
  background: var(--panel);
  border: 1px solid var(--edge2);
  border-radius: 6px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}
.hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--amber);
  transition: transform 0.15s ease, opacity 0.15s ease;
}

/* responsive: hamburger-reveal nav on narrow frames */
@media (max-width: 860px) {
  .hamburger { display: flex; }
  .lanes {
    position: fixed;
    top: 0;
    left: 0;
    width: min(280px, 84vw);
    flex: none;
    height: 100vh;
    border-right: 1px solid var(--edge2);
    border-bottom: 0;
    display: block;
    padding: 22px 0;
    transform: translateX(-100%);
    transition: transform 0.18s ease;
    z-index: 20;
    box-shadow: 8px 0 32px rgba(0, 0, 0, 0.5);
  }
  .navtoggle:checked ~ .lanes { transform: translateX(0); }
  /* hamburger -> X when open */
  .navtoggle:checked ~ .hamburger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .navtoggle:checked ~ .hamburger span:nth-child(2) { opacity: 0; }
  .navtoggle:checked ~ .hamburger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  /* dim scrim behind the open drawer */
  .navtoggle:checked ~ .scrim { opacity: 1; pointer-events: auto; }
  .scrim {
    position: fixed; inset: 0; background: rgba(0,0,0,0.55);
    opacity: 0; pointer-events: none; transition: opacity 0.18s ease; z-index: 15;
  }
  .brand { border-bottom: 1px solid var(--edge); }
  .lane { padding: 10px 18px; }
  .lane .rail { display: inline-block; } /* drawer is vertical again: rails come back */
  /* current state by PATTERN, not hue: bold label + doubled rail + tick glyph */
  .lane.cur { border-bottom: 0; }
  .lane.cur .lbl { font-weight: 700; color: var(--ink); }
  .lane.cur .rail { background: var(--amber); box-shadow: 0 5px 0 var(--amber); }
  .lane.cur .ln::after { content: ""; display: inline-block; width: 6px; height: 6px; margin-left: 4px;
    background: var(--amber); clip-path: polygon(0 55%, 35% 90%, 100% 20%, 80% 0, 35% 55%); }
  .field { padding: 72px 20px 80px; max-width: 100%; }
}

/* ---- theme-variable wiring (overrides hardcoded accents above) ---- */
.lane .rail { background: var(--idle); }
.lane:hover .rail { background: repeating-linear-gradient(90deg, var(--amber) 0 5px, transparent 5px 8px); }
.lane.cur .rail { background: var(--amber); box-shadow: 0 5px 0 var(--amber); }
.article code { color: var(--code); }
.article a { text-decoration-color: var(--link-under); }
.article a:hover { color: var(--amber); }
.article img[src*="-editor"] { background: transparent; }
[data-theme="light"] .article img { border-color: var(--edge2); }

/* ---- click-to-zoom overlay for figures ---- */
.imgzoom { cursor: zoom-in; display: block; }
.zoomoverlay {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(0,0,0,0.88);
  display: none;
  align-items: center; justify-content: center;
  flex-direction: column;
  cursor: zoom-out;
  padding: 4vh 4vw;
}
.zoomoverlay.open { display: flex; }
.zoomoverlay img {
  max-width: 96vw; max-height: 88vh;
  width: auto; height: auto;
  border: 1px solid var(--edge2); border-radius: 6px;
  background: var(--panel);
}
.zoomhint { margin-top: 12px; font: 11px var(--mono); color: var(--muted); letter-spacing: 0.1em; }