/* metalworking glossary — original stylesheet */

/* Azeret Mono — SIL Open Font License; license shipped at /assets/fonts/LICENSE */
@font-face {
  font-family: "Azeret Mono"; font-style: normal; font-weight: 400; font-display: swap;
  src: url("/assets/fonts/azeret-mono-latin-400-normal.woff2") format("woff2");
}
@font-face {
  font-family: "Azeret Mono"; font-style: normal; font-weight: 500; font-display: swap;
  src: url("/assets/fonts/azeret-mono-latin-500-normal.woff2") format("woff2");
}
@font-face {
  font-family: "Azeret Mono"; font-style: normal; font-weight: 700; font-display: swap;
  src: url("/assets/fonts/azeret-mono-latin-700-normal.woff2") format("woff2");
}

:root, html[data-theme="light"] {
  --bg: #eaeae7;
  --bg-side: #e1e1dd;
  --fg: #191919;
  --muted: #62625e;
  --line: #191919;
  --dash: #8a8a85;
  --hl: #d8d8d3;          /* inline term highlight */
  --hover: #19191914;
  --chip-fg: #62625e;
  --chip-border: #b9b9b3;
  --accent: #2f9e44;
  --accent-soft: #e2efe0;
  --px: #3f3f3b;          /* pixel-art fill */
  --sel-bg: #191919;      /* active sidebar block */
  --sel-fg: #f2f2ef;
  --tint: #2f9e4433;      /* ::selection + accent washes */
  --code-bg: #e0e0db;
  --on-accent: #0f1a10;
  --head: #191919;        /* headings; brighter than body in dark themes */
}
/* Terminal: phosphor — deep green-black, everything lives in green */
html[data-theme="terminal"] {
  --bg: #0d180a;
  --bg-side: #111f0d;
  --fg: #a6cc97;
  --muted: #6f9a62;
  --line: #3d6633;
  --dash: #3d6633;
  --hl: #1f3517;
  --hover: #77ef5e1c;
  --chip-fg: #8fb583;
  --chip-border: #3d6633;
  --accent: #77ef5e;
  --accent-soft: #142a0e;
  --px: #77ef5e;
  --sel-bg: #77ef5e;
  --sel-fg: #0d180a;
  --tint: #77ef5e33;
  --code-bg: #132410;
  --on-accent: #0d180a;
  --head: #77ef5e;
}
/* Light green: dark sage — muted gray-green, cream text */
html[data-theme="green"] {
  --bg: #2d342c;
  --bg-side: #293027;
  --fg: #dde5d3;
  --muted: #9aa892;
  --line: #b9c6ae;
  --dash: #71806a;
  --hl: #3d463b;
  --hover: #ffffff12;
  --chip-fg: #b5c2ab;
  --chip-border: #5b6952;
  --accent: #a9dc92;
  --accent-soft: #38402f;
  --px: #e7efdc;
  --sel-bg: #dde5d3;
  --sel-fg: #2d342c;
  --tint: #a9dc9233;
  --code-bg: #272e26;
  --on-accent: #2d342c;
  --head: #f2f7ea;
}
/* Violet Midnight — palette from mindfull/violet-midnight (MIT) */
html[data-theme="violet"] {
  --bg: #232034;
  --bg-side: #181627;
  --fg: #b4b7c5;
  --muted: #9a94c2;
  --line: #565174;
  --dash: #565174;
  --hl: #302d43;
  --hover: #b871de1f;
  --chip-fg: #8f8ab0;
  --chip-border: #393553;
  --accent: #43b6a2;
  --accent-soft: #181627;
  --px: #b871de;
  --sel-bg: #b871de;
  --sel-fg: #181627;
  --tint: #385d7799;
  --code-bg: #0f0d1d;
  --on-accent: #181627;
  --head: #c678dd;
}

/* Memory-hierarchy diagram tokens (SVG inlined at build; fallbacks = terminal) */
:root, html[data-theme="light"] {
  --dg-bg: #e3e3de;      --dg-div: #c6c6bf;
  --dg-acc: #2f9e44;     --dg-on-acc: #f2f7ee;
  --dg-soft: #4c7a52;    --dg-core: #dde6d8;
  --dg-regs: #ccdac5;    --dg-regs-fg: #1c2b1a;
  --dg-mem: #e9efe4;     --dg-mut: #62625e;
  --dg-ghost-line: #b2b2aa; --dg-ghost-fg: #8a8a85;
  --dg-slc: #b7d2ab;     --dg-amber: #e2bd62;
  --dg-on-amber: #3a300f; --dg-gray: #7d7d76;
  --dg-gray-fg: #55554f;
}
html[data-theme="terminal"] {
  --dg-bg: #0d180a;      --dg-div: #24361d;
  --dg-acc: #77ef5e;     --dg-on-acc: #0d180a;
  --dg-soft: #a6cc97;    --dg-core: #12240d;
  --dg-regs: #1c3315;    --dg-regs-fg: #d9ead0;
  --dg-mem: #0f1e0c;     --dg-mut: #6f9a62;
  --dg-ghost-line: #2c4423; --dg-ghost-fg: #4a6a3e;
  --dg-slc: #2c5423;     --dg-amber: #e8c268;
  --dg-on-amber: #1a1608; --dg-gray: #8a8f7a;
  --dg-gray-fg: #b9bfa9;
}
html[data-theme="green"] {
  --dg-bg: #293027;      --dg-div: #4a5644;
  --dg-acc: #a9dc92;     --dg-on-acc: #2d342c;
  --dg-soft: #b5c2ab;    --dg-core: #313930;
  --dg-regs: #3d463b;    --dg-regs-fg: #eef4e6;
  --dg-mem: #272e26;     --dg-mut: #9aa892;
  --dg-ghost-line: #4d584a; --dg-ghost-fg: #71806a;
  --dg-slc: #46543f;     --dg-amber: #d9c47e;
  --dg-on-amber: #2a2410; --dg-gray: #8f9a88;
  --dg-gray-fg: #b0bca7;
}
html[data-theme="violet"] {
  --dg-bg: #181627;      --dg-div: #393553;
  --dg-acc: #43b6a2;     --dg-on-acc: #181627;
  --dg-soft: #9a94c2;    --dg-core: #232034;
  --dg-regs: #302d43;    --dg-regs-fg: #d9d6ea;
  --dg-mem: #1d1a2e;     --dg-mut: #8f8ab0;
  --dg-ghost-line: #393553; --dg-ghost-fg: #6c6690;
  --dg-slc: #3a3357;     --dg-amber: #dcaf5e;
  --dg-on-amber: #241c07; --dg-gray: #8a86a3;
  --dg-gray-fg: #b3aec9;
}

:root { --topbar-h: 62px; }
* { box-sizing: border-box; }
html { font-size: 16px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Azeret Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  line-height: 1.5;
  font-variant-ligatures: none;
}
::selection { background: var(--tint); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.skip {
  position: absolute; left: 1rem; top: -3rem; z-index: 60;
  background: var(--sel-bg); color: var(--sel-fg); padding: 0.5rem 1rem;
  text-decoration: none; transition: top 0.1s;
}
.skip:focus { top: 1rem; }
.frame { border: 1px solid var(--line); margin: 14px; min-height: calc(100vh - 28px); display: flex; flex-direction: column; }

/* ---- top bar ---- */
.top {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 1.3rem;
  padding: 0.85rem 1.4rem;
  border-bottom: 1px solid var(--line);
  background: var(--bg-side);
}
.wordmark { font-weight: 700; font-size: 1.05rem; color: var(--fg); text-decoration: none; letter-spacing: 0.02em; }
.themes { margin-left: auto; position: relative; }
.theme-btn {
  display: flex; align-items: center; gap: 0.5rem;
  font: inherit; font-size: 0.85rem; color: var(--fg);
  background: var(--bg); border: 1px solid var(--dash);
  padding: 0.35rem 0.7rem; cursor: pointer; min-width: 10.5rem;
  justify-content: space-between;
}
.theme-btn:hover { border-color: var(--fg); }
.theme-btn .caret { color: var(--muted); font-size: 0.75rem; }
.theme-list {
  position: absolute; right: 0; top: calc(100% + 6px); z-index: 30;
  list-style: none; margin: 0; padding: 0.25rem 0;
  background: var(--bg); border: 1px solid var(--line); min-width: 100%;
}
.theme-list[hidden] { display: none; }
.theme-list button {
  display: block; width: 100%; text-align: left;
  font: inherit; font-size: 0.85rem; color: var(--fg);
  background: none; border: none; padding: 0.4rem 0.9rem; cursor: pointer;
  white-space: nowrap;
}
.theme-list button::before {
  content: ""; display: inline-block; width: 10px; height: 10px;
  margin-right: 0.55rem; border: 1px solid var(--dash);
}
.theme-list button[data-theme="terminal"]::before { background: #0d180a; }
.theme-list button[data-theme="green"]::before { background: #2d342c; }
.theme-list button[data-theme="light"]::before { background: #eaeae7; }
.theme-list button[data-theme="violet"]::before { background: #232034; }
.theme-list button:hover { background: var(--hover); }
.theme-list button.on { background: var(--sel-bg); color: var(--sel-fg); }
.searchbox {
  display: flex; align-items: center; gap: 0.5rem;
  font: inherit; font-size: 0.85rem; color: var(--muted);
  background: var(--bg); border: 1px solid var(--dash);
  padding: 0.35rem 0.7rem; cursor: pointer; min-width: 12rem;
}
.searchbox:hover { border-color: var(--fg); color: var(--fg); }
.searchbox kbd { margin-left: auto; border: 1px solid var(--dash); padding: 0 0.3rem; font-size: 0.75rem; }
.gh-btn {
  color: var(--fg); text-decoration: none; font-size: 0.85rem;
  border: 1px solid var(--line); padding: 0.35rem 0.9rem; border-radius: 3px;
}
.gh-btn:hover { background: var(--fg); color: var(--bg); }
.burger { display: none; background: none; border: none; font-size: 1.2rem; color: var(--fg); cursor: pointer; }

/* ---- layout ---- */
.body { display: flex; flex: 1; min-height: 0; position: relative; }
/* sidebar surface + dashed divider span the full row, however long the page */
.body::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 330px;
  background: var(--bg-side);
}
.body::after {
  content: ""; position: absolute; left: 330px; top: 0; bottom: 0; width: 1px;
  background: repeating-linear-gradient(to bottom, var(--dash) 0 9px, transparent 9px 17px);
}
.toc {
  width: 330px; flex: none; padding: 1.3rem 0 2rem 0;
  position: sticky; top: var(--topbar-h, 61px); overflow-y: auto;
  max-height: calc(100vh - var(--topbar-h, 61px));
  z-index: 1;
  scrollbar-width: thin; scrollbar-color: var(--dash) transparent;
}
.toc::-webkit-scrollbar { width: 6px; }
.toc::-webkit-scrollbar-thumb { background: var(--dash); }
.toc-bar { display: flex; align-items: center; justify-content: space-between; padding: 0 1.5rem 1rem; }
.toc-title { font-size: 0.85rem; letter-spacing: 0.2em; }
.toc-close { display: none; background: none; border: none; color: var(--fg); font: inherit; font-size: 1.5rem; line-height: 1; cursor: pointer; padding: 0.2rem 0.4rem; }
.backdrop { position: fixed; inset: 0; background: #00000066; z-index: 25; }
.backdrop[hidden] { display: none; }
.toc-section { margin-top: 0.35rem; }
.toc-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.35rem 1.5rem; cursor: pointer;
}
.toc-head span {
  font-size: 0.78rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--muted); font-weight: 500;
}
.toc-head:hover { background: var(--hover); }
.toc-head .fold { background: none; border: none; color: var(--muted); font: inherit; cursor: pointer; padding: 0.5rem 0.6rem; margin: -0.5rem -0.6rem; }
.toc-section > ul { list-style: none; margin: 0; padding: 0; }
.toc-section.folded > ul { display: none; }
.toc-section a {
  display: flex; align-items: center; gap: 0.6rem;
  color: var(--fg); text-decoration: none; font-size: 0.95rem;
  padding: 0.34rem 1.1rem 0.34rem 2.5rem; line-height: 1.4;
}
.toc-section a:hover { background: var(--hover); }
.toc-section a.active { background: var(--sel-bg); color: var(--sel-fg); }
.chip {
  margin-left: auto;
  font-size: 0.7rem; color: var(--chip-fg);
  border: 1px solid var(--chip-border); background: none;
  padding: 0.05rem 0.4rem; border-radius: 3px; white-space: nowrap;
}
.toc-section a.active .chip { color: var(--sel-fg); border-color: var(--sel-fg); }

/* ---- content ---- */
.content { flex: 1; min-width: 0; padding: 1.8rem 3.4rem 3.5rem; max-width: 1150px; margin: 0 auto; }
.crumb { color: var(--muted); font-size: 0.9rem; margin-bottom: 0.5rem; }
.content h1 { font-size: 1.75rem; margin: 0.3rem 0 1.5rem; font-weight: 400; color: var(--head); }
.content h2 { font-size: 1.25rem; margin-top: 2.4rem; font-weight: 500; color: var(--head); }
.content h3 { font-size: 1.05rem; margin-top: 1.9rem; font-weight: 700; color: var(--head); }
.wordmark { color: var(--head); display: flex; align-items: center; gap: 0.55rem; }
.px-mark { height: 15px; width: auto; }
.px-mark .px-fill rect { fill: var(--accent); }
.px-mark .px-shadow { display: none; }
.content p, .content li { font-size: 1rem; line-height: 1.5; }
.content li { margin: 0.3rem 0; }
.content a { color: var(--fg); }
.content a.term {
  background: var(--hl); text-decoration: none;
  padding: 0.06em 0.32em; border-radius: 2px;
}
.content a.term:hover { background: var(--sel-bg); color: var(--sel-fg); }
.content a:not(.term):hover { color: var(--accent); }
.ext { font-size: 0.8em; margin-left: 0.15em; color: var(--accent); }
.content img { max-width: 100%; border: 1px solid var(--dash); }
.content svg.diagram { width: 100%; height: auto; border: 1px solid var(--dash); border-radius: 6px; }
.content code {
  background: var(--code-bg); padding: 0.08em 0.35em; border-radius: 2px; font-size: 0.92em;
}
.content pre {
  background: var(--code-bg); border: 1px solid var(--chip-border);
  padding: 1rem 1.2rem; overflow-x: auto; font-size: 0.85rem; line-height: 1.5;
}
.content pre code { background: none; padding: 0; }
.content blockquote {
  margin: 1.3rem 0; padding: 0.2rem 1.2rem;
  border-left: 3px solid var(--accent); color: var(--muted);
}
.content table { border-collapse: collapse; font-size: 0.88rem; margin: 1.3rem 0; display: block; overflow-x: auto; }
.content th, .content td { border: 1px solid var(--chip-border); padding: 0.4rem 0.75rem; text-align: left; }
.content th { background: var(--hl); }
.content hr { border: none; height: 1px; background: repeating-linear-gradient(to right, var(--dash) 0 9px, transparent 9px 17px); }

/* ---- pixel branding ---- */
.pixel-title { margin: 1.4rem 0 2.4rem; }
.px-art { display: block; height: auto; }
.px-big { width: min(620px, 92%); }
.px-small { width: min(380px, 62%); margin-top: 14px; }
/* the heavy face is solid by design; the offset outline would muddy it */
.px-heavy .px-shadow { display: none; }
.px-fill rect { fill: var(--px); }
.px-shadow rect { fill: none; stroke: var(--fg); stroke-width: 0.9; opacity: 0.6; }
.tagline { color: var(--muted); margin-top: 1.3rem; font-size: 0.95rem; }
/* landing typewriter: letters hidden until the animation reveals them */
.pixel-title.typing .px-letter { opacity: 0; }
.pixel-title .px-letter.on { opacity: 1; }
.px-cursor { fill: var(--accent); }
.blink { animation: mw-blink 0.85s steps(1) infinite; }
@keyframes mw-blink { 50% { opacity: 0; } }
.tcur { display: inline-block; width: 0.55em; height: 1em; background: var(--accent); vertical-align: -0.15em; margin-left: 3px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---- page nav / footer ---- */
.pagenav {
  display: flex; justify-content: space-between; gap: 1rem; margin-top: 3.2rem;
  padding-top: 1.3rem; position: relative;
}
.pagenav::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: repeating-linear-gradient(to right, var(--dash) 0 9px, transparent 9px 17px);
}
.pager, .pager-empty { flex: 1; min-width: 0; }
.pager {
  display: flex; flex-direction: column; gap: 0.45rem;
  border: 1px solid var(--chip-border);
  padding: 1.1rem 1.3rem 1.2rem;
  text-decoration: none; color: var(--fg);
}
.pager.next { align-items: flex-end; text-align: right; border-color: var(--accent); background: var(--accent-soft); }
.pager-kicker {
  display: inline-flex; align-items: center; gap: 0.55rem;
  font-size: 0.8rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent);
}
.pager-title { font-size: 1.2rem; font-weight: 700; line-height: 1.3; }
.pager .arr { flex: none; transition: transform 0.15s ease; }
.pager.prev .arr { transform: scaleX(-1); }
.pager:hover { background: var(--accent); border-color: var(--accent); }
.pager:hover .pager-kicker, .pager:hover .pager-title { color: var(--on-accent); }
.pager.next:hover .arr { transform: translateX(5px); }
.pager.prev:hover .arr { transform: scaleX(-1) translateX(5px); }
@media (max-width: 700px) {
  .pagenav { flex-direction: column; }
  .pager-empty { display: none; }
}
.pagefoot { margin-top: 1.6rem; font-size: 0.8rem; }
.pagefoot a { color: var(--muted); }
.pagefoot a:hover { color: var(--accent); }

.promo {
  margin-top: 2.5rem; border: 1px solid var(--accent); background: var(--accent-soft);
  padding: 1rem 1.3rem; font-size: 0.9rem;
}

/* ---- search overlay ---- */
.search-overlay {
  position: fixed; inset: 0; background: #00000059;
  display: flex; justify-content: center; padding-top: 12vh; z-index: 40;
}
.search-overlay[hidden] { display: none; }
.search-panel { background: var(--bg); border: 1px solid var(--line); width: min(580px, 92vw); align-self: flex-start; }
#search-input {
  width: 100%; border: none; border-bottom: 1px solid var(--dash);
  background: none; color: var(--fg); font: inherit; padding: 0.85rem 1rem; outline: none;
}
#search-results { list-style: none; margin: 0; padding: 0.4rem 0; max-height: 50vh; overflow-y: auto; }
#search-results a { display: block; padding: 0.5rem 1rem; color: var(--fg); text-decoration: none; font-size: 0.9rem; }
#search-results a:hover, #search-results li.sel a { background: var(--sel-bg); color: var(--sel-fg); }
#search-results .sec { color: var(--muted); font-size: 0.75rem; margin-left: 0.6rem; }
#search-results li.sel a .sec { color: inherit; }

/* ---- mobile ---- */
@media (max-width: 900px) {
  .frame { margin: 6px; }
  .themes, .searchbox { display: none; }
  .burger { display: block; }
  .toc {
    position: fixed; left: 0; top: 0; bottom: 0; z-index: 30; width: 300px;
    background: var(--bg-side); border-right: 1px solid var(--line);
    transform: translateX(-100%); transition: transform 0.15s ease; max-height: none;
  }
  .toc.open { transform: none; }
  .body::before, .body::after { display: none; }
  .content { padding: 1.2rem 1.2rem 2.5rem; }
}


.cmt { color: var(--muted); }
.content pre:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.search-hint {
  border-top: 1px solid var(--dash); padding: 0.5rem 1rem;
  color: var(--muted); font-size: 0.75rem;
}
.search-hint kbd { border: 1px solid var(--dash); padding: 0 0.3rem; margin-right: 2px; }
#search-results .snip { display: block; color: var(--muted); font-size: 0.75rem; margin-top: 1px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#search-results li.sel a .snip, #search-results a:hover .snip { color: inherit; opacity: 0.75; }
body.nav-open { overflow: hidden; }

@media (max-width: 900px) {
  .toc-close { display: block; }
}
@media (min-width: 901px) {
  .backdrop { display: none !important; }
}
@media print {
  .top, .toc, .backdrop, .pagenav, .pagefoot, .skip, .search-overlay { display: none !important; }
  .body::before, .body::after { display: none; }
  .frame { border: none; margin: 0; }
  .content { max-width: none; padding: 0; }
  body { background: #fff; color: #000; }
}