@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/ibm-plex-mono-400-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2122, U+2212;
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("fonts/ibm-plex-mono-500-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2122, U+2212;
}

:root {
  --bg: #ffffff;
  --bg-tint: #f7f7f4;
  --text: #111113;
  --text-heading: #303130;
  --text-dim: #616160;
  --text-faint: #717270;
  --border: #e4e4df;
  --border-strong: #91928f;
  --navy: #011f5b;
  --navy-deep: #001541;
  --navy-soft: #dbe3f5;
  --rust: #990000;
  --rust-soft: #fbe5e5;
  --good: #1d6f3f;
  --good-soft: #dcefe2;
  --font-sans: Verdana, Geneva, "DejaVu Sans", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --measure: 66ch;
  --page-max: 880px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Reserve scrollbar gutter so a short page (no vertical overflow) doesn't
   horizontally shift the centered .wrap relative to the main site, which
   always has a scrollbar consuming ~15px of layout width. */
html { scrollbar-gutter: stable; }

body { min-height: 100vh; }

a {
  color: var(--navy);
  text-decoration: none;
  border-bottom: 1px solid var(--navy-soft);
  transition: border-color .12s ease, color .12s ease;
}
a:hover { color: var(--navy-deep); border-bottom-color: var(--navy-deep); }

code, kbd, samp, pre, .mono { font-family: var(--font-mono); font-size: .92em; }

h1, h2, h3 {
  font-family: var(--font-sans);
  color: var(--text-heading);
  font-weight: 700;
  line-height: 1.2;
  margin: 0;
}
h1 { font-size: clamp(2rem, 4.5vw, 2.8rem); letter-spacing: -.01em; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1rem; }

p { margin: 0 0 1em; max-width: var(--measure); color: var(--text); }
strong { color: var(--text-heading); font-weight: 700; }

.dim   { color: var(--text-dim); }
.faint { color: var(--text-faint); }
.hidden { display: none !important; }
.accent { color: var(--rust); }

.page {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 5rem 1.5rem;
}

.overline {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-dim);
  display: block;
  /* Tight kicker→title gap so the overline reads as a label for the h1
     beneath it; the h1's 1.25rem margin-bottom keeps the title→body break
     visibly larger than this internal gap. */
  margin-bottom: .75rem;
}

.rule {
  height: 2px;
  background: var(--navy);
  border: 0;
  margin: 3.5rem 0;
  max-width: 72px;
}

/* topnav */
nav.topnav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: #ffffffe0;
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--border);
}
nav.topnav .wrap {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: .9rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.5rem;
}
nav.topnav .brand {
  color: var(--text-heading);
  font-weight: 500;
  font-size: .9rem;
  border: 0;
  font-family: var(--font-mono);
  letter-spacing: -.01em;
}
nav.topnav .brand:after {
  content: "";
  display: inline-block;
  width: 2px;
  height: .95em;
  background: var(--navy);
  margin-left: 3px;
  vertical-align: -.1em;
  animation: brand-caret-blink 1.06s step-end infinite;
}
@keyframes brand-caret-blink {
  0%, 50% { opacity: 1; }
  50.01%, 100% { opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  nav.topnav .brand:after { animation: none; opacity: 1; }
}
nav.topnav ul { list-style: none; display: flex; gap: 1.25rem; padding: 0; margin: 0; }
nav.topnav a {
  border: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--text-dim);
  letter-spacing: .04em;
}
nav.topnav a:hover { color: var(--navy); }

/* ---------- Projects dropdown (mirrors siriusganesh.com toolbar) ---------- */
nav.topnav .has-dropdown { position: relative; }
nav.topnav details { display: inline; }
nav.topnav details > summary {
  display: inline; list-style: none; cursor: pointer;
  font-family: var(--font-mono); font-size: .78rem;
  color: var(--text-dim); letter-spacing: .04em;
  user-select: none; white-space: nowrap;
}
nav.topnav details > summary::-webkit-details-marker { display: none; }
nav.topnav details > summary::marker { content: ''; }
nav.topnav details > summary::after {
  content: '▾'; font-size: .65rem; margin-left: .3rem; opacity: .7;
  display: inline-block; transition: transform 120ms ease;
}
nav.topnav details[open] > summary::after { transform: rotate(180deg); }
nav.topnav details > summary:hover,
nav.topnav details[open] > summary { color: var(--navy); }

nav.topnav .dropdown-menu {
  position: absolute; top: calc(100% + .4rem); right: 0;
  min-width: 12rem; background: var(--bg);
  border: 0; padding: 0; margin: 0; list-style: none;
  display: flex; flex-direction: column;
  align-items: stretch; gap: 0;
  box-shadow: 0 6px 18px rgba(0,0,0,.14);
  z-index: 20;
}
nav.topnav .dropdown-menu li { padding: 0; }
nav.topnav .dropdown-menu a,
nav.topnav .dropdown-menu .is-current {
  display: block; padding: .55rem .9rem; font-size: .78rem;
  border: 1px solid transparent;
  transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease;
}
nav.topnav .dropdown-menu a:hover {
  background: var(--navy-soft); border-color: var(--navy); color: var(--navy);
}
/* Current page marker is rendered as <span class="is-current"> rather than
   <a> so it doesn't fail the Lighthouse crawlable-anchors audit (anchors
   without href are not crawlable). aria-current="page" on the span carries
   the semantics; this rule dims it to match the anchor's "current" state. */
nav.topnav .dropdown-menu .is-current,
nav.topnav .dropdown-menu .is-current:hover {
  color: var(--text-faint);
  background: transparent; border-color: transparent;
  pointer-events: none; cursor: default;
  text-decoration: line-through;
  text-decoration-thickness: 1px;
}
/* Keep the ↗ arrow un-struck on the current item. */
nav.topnav .dropdown-menu .is-current .ext-arrow {
  text-decoration: none;
}
nav.topnav .dropdown-menu .ext-arrow {
  font-size: .85em; color: var(--text-faint); margin-left: .15rem;
}
nav.topnav .dropdown-menu a:hover .ext-arrow { color: var(--navy); }

/* hero */
.hero { padding-top: 3rem; padding-bottom: 1rem; }
.hero h1 { margin-bottom: 1.25rem; }
.hero .lede { font-size: 1.05rem; color: var(--text); max-width: var(--measure); }
.hero .lede strong { color: var(--text-heading); }

/* section block */
section.block { margin: 4rem 0; }
section.block > header {
  display: flex;
  align-items: baseline;
  gap: .8rem;
  margin-bottom: 1.75rem;
  padding-bottom: .75rem;
  border-bottom: 1px solid var(--border);
}
section.block > header .num {
  font-family: var(--font-sans);
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--navy);
  letter-spacing: .02em;
}
section.block > header h2 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-heading);
  letter-spacing: 0;
}
section.block > header .meta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--text-faint);
  letter-spacing: .05em;
}

.subsection-label {
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--navy);
  margin: 0 0 1rem;
  padding-bottom: .4rem;
  border-bottom: 1px solid var(--navy-soft);
}
.subsection-label .dim { text-transform: none; letter-spacing: .03em; color: var(--text-faint); font-weight: 400; }

/* input */
.input-row {
  display: flex;
  gap: .75rem;
  margin: 1rem 0 1.25rem;
  align-items: stretch;
}
#letters {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  padding: .85rem 1rem;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: 0;
  color: var(--text-heading);
  letter-spacing: .15em;
  text-transform: uppercase;
}
#letters::placeholder {
  color: var(--text-faint);
  letter-spacing: .08em;
  text-transform: none;
}
#letters:focus {
  outline: none;
  border-color: var(--navy);
  box-shadow: inset 0 -2px 0 0 var(--navy);
}
button#check {
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: 0 1.4rem;
  background: var(--navy);
  color: #fff;
  border: 1px solid var(--navy);
  border-radius: 0;
  cursor: pointer;
}
button#check:hover:not(:disabled) { background: var(--navy-deep); border-color: var(--navy-deep); }
button#check:disabled {
  background: var(--bg-tint);
  border-color: var(--border);
  color: var(--text-faint);
  cursor: not-allowed;
}

/* verdict */
.verdict {
  margin: 1rem 0 .25rem;
  padding: .9rem 1rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--navy);
  background: var(--bg-tint);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .55rem;
}
.verdict.good {
  border-left-color: var(--good);
  background: var(--good-soft);
}
.verdict.bad {
  border-left-color: var(--rust);
  background: var(--rust-soft);
}
.verdict-mark {
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: .15rem .5rem;
  background: #fff;
  border: 1px solid currentColor;
  color: var(--navy);
}
.verdict.good .verdict-mark { color: var(--good); }
.verdict.bad  .verdict-mark { color: var(--rust); }
.verdict-word {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: .12em;
  color: var(--text-heading);
}
.verdict-note {
  font-size: .92rem;
  color: var(--text-dim);
}

/* word tiles (buttons) */
.words {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: 0 0 .25rem;
}
button.word {
  font-family: var(--font-mono);
  font-size: .85rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: .25rem .55rem;
  border: 1px solid var(--border);
  background: var(--bg-tint);
  color: var(--text-heading);
  cursor: pointer;
  transition: border-color .1s ease, color .1s ease, background .1s ease;
}
button.word:hover,
button.word:focus-visible {
  border-color: var(--navy);
  color: var(--navy);
  background: var(--navy-soft);
  outline: none;
}
button.word:active {
  background: var(--navy);
  color: #fff;
  border-color: var(--navy);
}

.length-group {
  margin: 1rem 0 1.25rem;
  padding: .85rem 1rem 1rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--navy);
  background: var(--bg);
}
.length-head {
  display: flex;
  align-items: baseline;
  gap: .65rem;
  margin-bottom: .65rem;
  padding-bottom: .4rem;
  border-bottom: 1px dashed var(--border);
}
.length-label {
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--navy);
}
.length-count {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--text-faint);
  letter-spacing: .04em;
}

.empty-note {
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--text-faint);
  letter-spacing: .03em;
}

/* footer */
footer.page-footer {
  border-top: 1px solid var(--border);
  margin-top: 5rem;
  padding: 1.5rem;
  max-width: var(--page-max);
  margin-left: auto;
  margin-right: auto;
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--text-faint);
  letter-spacing: .05em;
}

/* responsive */
@media (max-width: 720px) {
  nav.topnav ul {
    gap: 1rem;
    overflow-x: auto;
    flex-wrap: nowrap;
    scrollbar-width: none;
  }
  nav.topnav ul::-webkit-scrollbar { display: none; }
  nav.topnav a { white-space: nowrap; }
  /* Anchor dropdown to the viewport so the scrolling ul doesn't clip it. */
  nav.topnav .dropdown-menu {
    position: fixed;
    top: 2.6rem;
    right: 1rem;
    left: auto;
  }
  .page { padding: 3rem 1.25rem; }
  section.block { margin: 2.75rem 0; }
  .hero { padding-top: 1.5rem; padding-bottom: .5rem; }
  .rule { margin: 2.25rem 0; }
}

@media (max-width: 560px) {
  section.block > header .meta { display: none; }
  footer.page-footer { flex-direction: column; gap: .35rem; }
  nav.topnav .wrap {
    justify-content: space-between;
    align-items: center;
    padding: .7rem 1rem;
    gap: .9rem;
  }
  nav.topnav .brand { flex-shrink: 0; }
  nav.topnav a { font-size: .72rem; }
  .page { padding: 2.5rem 1rem 3rem; }
  .input-row { flex-direction: column; gap: .5rem; }
  button#check { padding: .8rem 1.2rem; }
  #letters { font-size: 1rem; }
}

/* definition */
.definition {
  margin: .75rem 0 .25rem;
  padding: .85rem 1rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--navy);
  background: var(--bg);
  font-size: .94rem;
  line-height: 1.55;
}
.definition.missing,
.definition.error {
  border-left-color: var(--border-strong);
  background: var(--bg-tint);
}
.defn-label {
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--navy);
  margin-right: .55rem;
}
.defn-phon {
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--text-faint);
}
.defn-loading,
.defn-missing {
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--text-dim);
  letter-spacing: .03em;
}
.defn-list { margin-top: .55rem; display: flex; flex-direction: column; gap: .4rem; }
.defn-row {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 1rem;
  align-items: baseline;
  padding-bottom: .35rem;
  border-bottom: 1px dashed var(--border);
}
.defn-row:last-child { border-bottom: 0; padding-bottom: 0; }
.defn-pos {
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--navy);
  font-style: italic;
}
.defn-text { color: var(--text); }

@media (max-width: 560px) {
  .defn-row { grid-template-columns: 1fr; gap: .15rem; }
}