/* MASM64 init. The same reading layout as the other programming guides (a
   chapter menu on the left, one reading column), dressed in warm paper and
   amber in the light, near-black and amber in the dark, the menu as a plain
   list with a marker instead of buttons, and code coloured the way an
   assembler listing reads: instructions, registers, directives and macros
   each their own colour.

   The theme follows the system (prefers-color-scheme) until the toggle in the
   header picks one, which theme.js remembers in localStorage. */

:root {
  color-scheme: light;
  --page: #f7f4ee;
  --surface: #fffdf9;
  --ink: #1d1f24;
  --muted: #6c6f76;
  --rule: #e2dccf;
  --accent: #c26a12;
  --accent-soft: #f6e6d2;
  --link: #a8540b;
  --heading: #22252b;
  --def: #2f7a4f;
  --fun: #8f2f4b;
  --var: #2b4f8c;
  --inline-code: #ece6da;
  --note-bg: #eaf4ec; --note-edge: #4f9a6a;
  --warn-bg: #fbe9e6; --warn-edge: #c4493a;
  --figure-bg: transparent;
  /* code */
  --code-bg: #f1ece2; --code-ink: #26282d; --code-rule: #e0d8c8; --code-lines: #a59f93;
  --c-k: #b4500e;   /* instructions, keywords */
  --c-r: #1d6b86;   /* registers */
  --c-d: #7b3fa0;   /* directives */
  --c-m: #a3305d;   /* macros */
  --c-t: #2e6e3e;   /* types and constants */
  --c-f: #8a6400;   /* methods and functions */
  --c-n: #c0392b;   /* numbers */
  --c-s: #9a5b2a;   /* strings */
  --c-c: #8b8678;   /* comments */
  --c-l: #2449b8;   /* labels */
  --mono: "JetBrains Mono", Consolas, "Cascadia Mono", monospace;
  --sans: "IBM Plex Sans", "Segoe UI", sans-serif;
}

/* Dark: by the system's choice unless the toggle chose light, or by the toggle. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --page: #121417; --surface: #181b20; --ink: #e2e4e8; --muted: #9399a3; --rule: #2a2e36;
    --accent: #f0a646; --accent-soft: #2c2418; --link: #f3b462; --heading: #f1f2f4;
    --def: #7fd19b; --fun: #f08fae; --var: #8fb6f2; --inline-code: #252930;
    --note-bg: #16261d; --note-edge: #4f9a6a; --warn-bg: #2c1a18; --warn-edge: #d0604f;
    --figure-bg: #f1ece2;
    --code-bg: #0e1013; --code-ink: #d9dce1; --code-rule: #23272e; --code-lines: #555c66;
    --c-k: #f3a35b; --c-r: #7cc7e0; --c-d: #c99aea; --c-m: #f590b0; --c-t: #9fd17a;
    --c-f: #e8c77a; --c-n: #ff8f6b; --c-s: #e3ae84; --c-c: #6c727c; --c-l: #8fb0ff;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #121417; --surface: #181b20; --ink: #e2e4e8; --muted: #9399a3; --rule: #2a2e36;
  --accent: #f0a646; --accent-soft: #2c2418; --link: #f3b462; --heading: #f1f2f4;
  --def: #7fd19b; --fun: #f08fae; --var: #8fb6f2; --inline-code: #252930;
  --note-bg: #16261d; --note-edge: #4f9a6a; --warn-bg: #2c1a18; --warn-edge: #d0604f;
  --figure-bg: #f1ece2;
  --code-bg: #0e1013; --code-ink: #d9dce1; --code-rule: #23272e; --code-lines: #555c66;
  --c-k: #f3a35b; --c-r: #7cc7e0; --c-d: #c99aea; --c-m: #f590b0; --c-t: #9fd17a;
  --c-f: #e8c77a; --c-n: #ff8f6b; --c-s: #e3ae84; --c-c: #6c727c; --c-l: #8fb0ff;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 16.5px/1.65 var(--sans);
  color: var(--ink);
  background: var(--page);
}
a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--accent); }

/* Header ------------------------------------------------------------------ */
#header {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px max(16px, calc((100vw - 1160px) / 2));
  background: var(--surface); border-bottom: 1px solid var(--rule);
  border-top: 3px solid var(--accent);
}
.logo { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; text-decoration: none; line-height: 1.1; }
.logo-main { font-size: 1.7rem; font-weight: 700; letter-spacing: -.02em; color: var(--heading); }
.logo-main::after { content: "_"; color: var(--accent); margin-left: 1px; }
.logo-sub { font-family: var(--mono); font-size: .9rem; color: var(--muted); }
.site-links { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; font-size: .9rem; }
.site-links a { color: var(--muted); text-decoration: none; }
.site-links a:hover { color: var(--accent); }
.theme-toggle {
  display: inline-grid; place-items: center; width: 34px; height: 34px; padding: 0;
  font-size: 1.05rem; line-height: 1; cursor: pointer;
  color: var(--ink); background: var(--page); border: 1px solid var(--rule); border-radius: 50%;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle .moon { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: none; }
:root[data-theme="dark"] .theme-toggle .moon { display: inline; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .sun { display: none; }
  :root:not([data-theme="light"]) .theme-toggle .moon { display: inline; }
}

#supercontainer {
  display: flex; align-items: flex-start; gap: 40px;
  max-width: 1160px; margin: 0 auto; padding: 0 16px 80px;
}

/* Menu -------------------------------------------------------------------- */
#nav { flex: 0 0 220px; margin-top: 30px; position: sticky; top: 14px;
       max-height: calc(100vh - 28px); overflow-y: auto; font-size: .93rem; }
#nav ol { list-style: none; margin: 0; padding: 0; }
#nav ol ol { margin: 2px 0 8px; }
#nav li { margin: 0; }
#nav a {
  display: block; padding: 3px 10px; color: var(--muted); text-decoration: none;
  border-left: 2px solid var(--rule);
}
#nav a:hover { color: var(--ink); border-left-color: var(--muted); }
#nav a.selected { color: var(--heading); font-weight: 600; border-left-color: var(--accent);
                  background: var(--accent-soft); }
#nav summary {
  list-style: none; cursor: pointer; padding: 10px 0 4px;
  font-family: var(--mono); font-size: .74rem; font-weight: 600; letter-spacing: .08em;
  text-transform: uppercase; color: var(--heading);
}
#nav ol ol summary { padding: 6px 10px 2px; letter-spacing: .05em; color: var(--muted); }
#nav summary::-webkit-details-marker { display: none; }
#nav summary::before { content: "+ "; color: var(--accent); }
#nav details[open] > summary::before { content: "- "; }
#nav .menu-toggle { display: none; }

/* Reading column ---------------------------------------------------------- */
#content { flex: 0 1 780px; min-width: 0; padding-top: 12px; }
h1, h2, h3 { color: var(--heading); line-height: 1.25; }
h1 { margin: 1.4em 0 .4em; }
#content-title { margin-top: .7em; font-size: 2.2rem; letter-spacing: -.02em;
                 padding-bottom: .3em; border-bottom: 1px solid var(--rule); }
h2 { font-size: 1.4rem; margin: 1.8em 0 .4em; }
h2::before { content: "## "; font-family: var(--mono); font-weight: 400; color: var(--accent); font-size: .85em; }
h3 { font-size: 1.12rem; margin: 1.5em 0 .3em; }
p { margin: 0 0 1em; }
ul, ol { padding-left: 1.5em; }
li { margin-bottom: .35em; }

def { color: var(--def); font-weight: 600; }
fun { font-family: var(--mono); font-size: .92em; color: var(--fun); }
var { font-style: normal; font-family: var(--mono); font-size: .92em; color: var(--var); }
p code, li code, td code, note code, warning code, author code {
  font-family: var(--mono); font-size: .86em; background: var(--inline-code);
  padding: 1px 5px; border-radius: 4px;
}

note, warning, author { display: block; margin: 22px 0; padding: 12px 16px; border-radius: 0 6px 6px 0; }
note    { background: var(--note-bg); border-left: 4px solid var(--note-edge); }
warning { background: var(--warn-bg); border-left: 4px solid var(--warn-edge); }
author  { margin: 40px 0 10px; color: var(--muted); font-size: .9rem; border: 1px dashed var(--rule);
          border-radius: 6px; }

img {
  display: block; max-width: 100%; height: auto; margin: 20px auto;
  border-radius: 8px; border: 1px solid var(--rule);
  box-shadow: 0 6px 18px rgba(0, 0, 0, .12);
}
/* Diagrams are drawn for a light page: in the dark they sit on a light card. */
img.clean { border: 0; box-shadow: none; border-radius: 6px; background: var(--figure-bg);
            padding: var(--figure-pad, 0); }
#content svg { background: var(--figure-bg); border-radius: 6px; }
:root[data-theme="dark"] img.clean { --figure-pad: 10px; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) img.clean { --figure-pad: 10px; } }
img.small { width: 150px; } img.medium { width: 300px; } img.large { width: 500px; }
.pair { display: flex; gap: 14px; }
.pair img { flex: 1 1 0; min-width: 0; margin: 12px 0; }
figure { margin: 0; }
figcaption { text-align: center; color: var(--muted); font-size: .9rem; margin: -8px 0 16px; }

table { border-collapse: collapse; margin: 18px auto; text-align: center; font-size: .95rem; }
td, th { padding: 6px 12px; border-bottom: 1px solid var(--rule); }
th { border-bottom: 2px solid var(--accent); }
tr:nth-child(even) td { background: var(--surface); }

.MathJax, mjx-container { font-size: 105% !important; }
mjx-container[display="true"] { overflow-x: auto; overflow-y: hidden; }

/* Code -------------------------------------------------------------------- */
pre {
  margin: 0 0 1.2em; padding: 12px 16px; overflow-x: auto;
  background: var(--code-bg); color: var(--code-ink);
  border: 1px solid var(--code-rule); border-left: 3px solid var(--accent); border-radius: 0 6px 6px 0;
  font: 13.5px/1.55 var(--mono); tab-size: 4;
}
pre code { font: inherit; }
pre .k { color: var(--c-k); }
pre .r { color: var(--c-r); }
pre .d { color: var(--c-d); }
pre .m { color: var(--c-m); font-weight: 600; }
pre .t { color: var(--c-t); }
pre .f { color: var(--c-f); }
pre .n { color: var(--c-n); }
pre .s { color: var(--c-s); }
pre .c { color: var(--c-c); font-style: italic; }
pre .l { color: var(--c-l); font-weight: 600; }

/* Pager and code viewer -------------------------------------------------- */
.pager { display: flex; justify-content: space-between; gap: 12px; margin: 30px 0 0; }
.pager a { padding: 8px 14px; color: var(--ink); text-decoration: none;
           border: 1px solid var(--rule); border-radius: 6px; background: var(--surface); }
.pager a:hover { border-color: var(--accent); color: var(--accent); }
.pager .next { margin-left: auto; }

.code-path { color: var(--muted); margin-top: -.2em; font-family: var(--mono); font-size: .85rem; }
.code-tabs { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 6px; }
.code-tabs a { padding: 3px 10px; color: var(--muted); text-decoration: none; font-family: var(--mono);
               font-size: .82rem; border: 1px solid var(--rule); border-radius: 999px; }
.code-tabs a.selected { color: var(--heading); border-color: var(--accent); background: var(--accent-soft); }
.code-view { display: flex; background: var(--code-bg); border: 1px solid var(--code-rule);
             border-left: 3px solid var(--accent); border-radius: 0 6px 6px 0; overflow: hidden; }
.code-view pre { margin: 0; border: 0; border-radius: 0; }
.code-view pre.lines { flex: none; color: var(--code-lines); text-align: right; user-select: none;
                       padding-right: 10px; border-right: 1px solid var(--code-rule); overflow: visible; }
.code-view pre:last-child { flex: 1 1 auto; min-width: 0; }

/* Phones: the menu folds away above the article -------------------------- */
@media (max-width: 860px) {
  #header { flex-direction: column; align-items: flex-start; }
  #supercontainer { display: block; }
  #nav { position: static; max-height: none; margin-top: 16px; }
  #nav .menu-toggle { display: block; }
  #nav .menu-toggle:not([open]) + ol { display: none; }
  #content { padding-top: 0; }
  .pair { flex-direction: column; gap: 0; }
  #content-title { font-size: 1.8rem; }
}

/* MASM64-init chapter overview ------------------------------------------- */
.lede { font-size: 1.08rem; color: var(--muted); }
.steps { padding-left: 1.4em; }
.chapter-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
                gap: 12px; margin: 18px 0 28px; }
.chapter-card { display: grid; gap: 4px; padding: 14px 16px; color: var(--ink);
                text-decoration: none; border: 1px solid var(--rule); border-radius: 6px;
                background: var(--surface); }
.chapter-card:hover { border-color: var(--accent); color: var(--accent); }
.chapter-card span { color: var(--muted); font-size: .9rem; }

.concept-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
                gap: 10px; margin: 24px 0 34px; }
.concept { display: grid; gap: 5px; padding: 14px 16px; border: 1px solid var(--rule);
           border-radius: 6px; background: var(--surface); }
.concept strong { color: var(--heading); }
.concept span { color: var(--muted); font-size: .92rem; }

.lesson-intro { margin: 0 0 2rem; font-size: 1.03rem; }
.lesson-section { margin: 0 0 2.8rem; }
.lesson-section > h2 { margin-top: 0; }
.code-sample { margin: 18px 0 12px; }
.code-sample figcaption { margin: 0 0 7px; text-align: left; color: var(--muted);
                          font-family: var(--mono); font-size: .78rem; }
.code-sample pre { margin-bottom: 0; }
.code-note { margin: 0; padding: 9px 12px; color: var(--muted); font-size: .92rem;
             border-left: 2px solid var(--rule); }
.code-note strong { color: var(--ink); }
.takeaways { margin: 8px 0 26px; padding: 16px 20px 18px; border: 1px solid var(--rule);
             border-radius: 6px; background: var(--surface); }
.takeaways h2 { margin-top: 0; }
.takeaways ul { margin-bottom: 0; }
.source-footer { padding-top: 16px; border-top: 1px solid var(--rule); color: var(--muted); }

@media (max-width: 620px) {
  .chapter-grid, .concept-grid { grid-template-columns: 1fr; }
  .lesson-section { margin-bottom: 2.2rem; }
}