:root {
  --font-body: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono",
    monospace;

  --radius: 8px;
  --radius-sm: 5px;
  --max-w: 72ch;
  --wide-w: 88ch;
  --doc-w: 1360px;

  --nav-w: 240px;
  --toc-w: 220px;
  --header-h: 60px;

  --step-0: clamp(0.94rem, 0.92rem + 0.1vw, 1rem);
  --step-1: clamp(1.06rem, 1.02rem + 0.2vw, 1.15rem);
  --step-2: clamp(1.2rem, 1.14rem + 0.35vw, 1.35rem);
  --step-3: clamp(1.4rem, 1.3rem + 0.55vw, 1.65rem);
  --step-4: clamp(1.65rem, 1.5rem + 0.85vw, 2rem);
  --step-5: clamp(2rem, 1.7rem + 1.5vw, 2.75rem);
}

:root[data-theme="dark"] {
  --bg: #0a0f1a;
  --bg-elev: #131a28;
  --bg-elev-2: #1a2436;
  --bg-code: #060a12;

  --brand: #003366;
  --brand-tint: rgba(0, 51, 102, 0.35);

  --fg: #e6ecf3;
  --fg-muted: #98a3b3;
  --fg-subtle: #6b7789;

  --border: #1a2436;
  --border-strong: #2a3548;

  --accent: #7fb8ff;
  --accent-hover: #b3d4ff;
  --selection: rgba(127, 184, 255, 0.28);

  --callout-info-bg: rgba(127, 184, 255, 0.06);
  --callout-info-border: rgba(127, 184, 255, 0.35);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.35);
}

:root[data-theme="light"] {
  --bg: #fafbfd;
  --bg-elev: #ffffff;
  --bg-elev-2: #f0f3f7;
  --bg-code: #f2f5f9;

  --brand: #003366;
  --brand-tint: rgba(0, 51, 102, 0.06);

  --fg: #0a1729;
  --fg-muted: #4a5b73;
  --fg-subtle: #7a8ba3;

  --border: #e0e5ed;
  --border-strong: #c7cfdb;

  --accent: #0a5bcc;
  --accent-hover: #003b99;
  --selection: rgba(10, 91, 204, 0.18);

  --callout-info-bg: rgba(10, 91, 204, 0.05);
  --callout-info-border: rgba(10, 91, 204, 0.25);

  --shadow-sm: 0 1px 2px rgba(10, 23, 41, 0.06);
  --shadow-md: 0 4px 14px rgba(10, 23, 41, 0.08);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  font-feature-settings: "cv11", "ss01", "ss03";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--selection); }

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.12s ease, border-color 0.12s ease;
}
a:hover { color: var(--accent-hover); border-bottom-color: currentColor; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }

h1, h2, h3, h4 {
  color: var(--fg);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin-top: 2em;
  margin-bottom: 0.5em;
  scroll-margin-top: calc(var(--header-h) + 1rem);
  font-weight: 600;
}
h1 { font-size: var(--step-5); margin-top: 0.5em; letter-spacing: -0.025em; }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-2); }
h4 { font-size: var(--step-1); }

p, ul, ol { margin: 0.85em 0; }

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-elev-2);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--border);
}

pre {
  background: var(--bg-code);
  padding: 1em 1.1em;
  overflow-x: auto;
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 0 0 var(--radius) var(--radius);
  font-size: 0.88rem;
  line-height: 1.55;
}
pre code { background: transparent; padding: 0; border: 0; }

/* ---- Prism syntax tokens ---- */
:root[data-theme="dark"] {
  --tok-comment:   #6b7789;
  --tok-punct:     #98a3b3;
  --tok-keyword:   #c792ea;
  --tok-string:    #b7dc80;
  --tok-number:    #f7a072;
  --tok-function:  #82aaff;
  --tok-property:  #7fb8ff;
  --tok-variable:  #e6ecf3;
  --tok-operator:  #c792ea;
  --tok-class:     #ffcb6b;
  --tok-builtin:   #82aaff;
  --tok-tag:       #f07178;
  --tok-attr:      #ffcb6b;
  --tok-prompt:    #6b7789;
}
:root[data-theme="light"] {
  --tok-comment:   #7a8ba3;
  --tok-punct:     #4a5b73;
  --tok-keyword:   #9333ea;
  --tok-string:    #16803c;
  --tok-number:    #b85c00;
  --tok-function:  #0a5bcc;
  --tok-property:  #0a5bcc;
  --tok-variable:  #0a1729;
  --tok-operator:  #9333ea;
  --tok-class:     #a15c00;
  --tok-builtin:   #0a5bcc;
  --tok-tag:       #c2185b;
  --tok-attr:      #a15c00;
  --tok-prompt:    #7a8ba3;
}

.token.comment,
.token.prolog,
.token.doctype,
.token.cdata { color: var(--tok-comment); font-style: italic; }
.token.punctuation { color: var(--tok-punct); }
.token.namespace { opacity: 0.75; }
.token.property,
.token.tag,
.token.constant,
.token.symbol,
.token.deleted { color: var(--tok-property); }
.token.boolean,
.token.number { color: var(--tok-number); }
.token.selector,
.token.attr-name,
.token.char,
.token.builtin,
.token.inserted { color: var(--tok-builtin); }
.token.string,
.token.url,
.language-css .token.string,
.style .token.string { color: var(--tok-string); }
.token.operator,
.token.entity { color: var(--tok-operator); background: transparent; }
.token.atrule,
.token.attr-value,
.token.keyword { color: var(--tok-keyword); }
.token.function { color: var(--tok-function); }
.token.class-name { color: var(--tok-class); }
.token.regex,
.token.important,
.token.variable { color: var(--tok-variable); }
.token.important,
.token.bold { font-weight: 600; }
.token.italic { font-style: italic; }

/* language-console: dim the shell prompt marker */
.language-console .token.punctuation:first-child,
.language-console .token.operator {
  color: var(--tok-prompt);
}

/* code-enhance.js wraps <pre> in .code-wrap with a header. */
.code-wrap {
  margin: 1.25em 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0.9rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-bottom: 0;
  border-radius: var(--radius) var(--radius) 0 0;
  font-size: 0.75rem;
  font-family: var(--font-mono);
}
.code-wrap pre {
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}
.code-lang {
  color: var(--fg-subtle);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}
.code-copy {
  background: transparent;
  border: 1px solid transparent;
  color: var(--fg-muted);
  cursor: pointer;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font: inherit;
  transition: color 0.12s ease, border-color 0.12s ease, background 0.12s ease;
}
.code-copy:hover { color: var(--fg); border-color: var(--border-strong); background: var(--bg-elev-2); }
.code-copy.is-copied { color: var(--accent); border-color: var(--accent); }

blockquote {
  border-left: 3px solid var(--callout-info-border);
  background: var(--callout-info-bg);
  padding: 0.7em 1em;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--fg);
  margin: 1em 0;
}
blockquote p { margin: 0.3em 0; color: var(--fg-muted); }
blockquote p strong { color: var(--fg); }

hr { border: 0; border-top: 1px solid var(--border); margin: 2em 0; }

table { border-collapse: collapse; width: 100%; margin: 1em 0; font-size: 0.95em; }
th, td { padding: 0.55em 0.8em; border: 1px solid var(--border); text-align: left; vertical-align: top; }
th { background: var(--bg-elev); font-weight: 600; }

/* ---- Layout ---- */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(1rem, 4vw, 2rem);
  height: var(--header-h);
  border-bottom: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg) 85%, transparent);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
}
.site-title {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 600;
  color: var(--fg);
  border-bottom: none;
  font-size: 1rem;
  letter-spacing: -0.015em;
}
.site-title:hover { color: var(--accent); }
.site-mark { color: var(--accent); }
.site-nav { display: flex; gap: 1.5rem; align-items: center; }
.site-nav a { color: var(--fg-muted); border-bottom: none; font-size: 0.9rem; font-weight: 500; }
.site-nav a:hover { color: var(--fg); }

.theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg-muted);
  border-radius: 8px;
  width: 32px;
  height: 32px;
  cursor: pointer;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 0.12s ease, border-color 0.12s ease, background 0.12s ease;
}
.theme-toggle:hover { border-color: var(--border-strong); color: var(--fg); background: var(--bg-elev); }
.theme-toggle svg { display: block; }

.site-main {
  max-width: var(--wide-w);
  margin: 0 auto;
  padding: 3rem clamp(1rem, 4vw, 2rem) 5rem;
}
.site-main--wide {
  max-width: var(--doc-w);
  padding: 2.5rem clamp(1rem, 3vw, 2.5rem) 5rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem clamp(1rem, 4vw, 2rem);
  color: var(--fg-subtle);
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  max-width: var(--doc-w);
  margin: 0 auto;
}

/* ---- Home ---- */

.hero { padding: 3rem 0 2.5rem; }
.hero h1 {
  font-size: var(--step-5);
  margin: 0 0 0.75rem;
  letter-spacing: -0.03em;
  font-weight: 700;
}
.hero p { color: var(--fg-muted); max-width: var(--max-w); font-size: var(--step-1); }

.projects { display: grid; gap: 0.9rem; margin-top: 1.5rem; }
.project-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  background: var(--bg-elev);
  transition: border-color 0.12s ease, transform 0.12s ease, box-shadow 0.12s ease;
}
.project-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}
.project-card h3 { margin: 0 0 0.35rem; font-size: var(--step-2); }
.project-card p { margin: 0 0 0.75rem; color: var(--fg-muted); }
.project-card .links { display: flex; gap: 1.25rem; font-size: 0.9rem; }
.project-card .links a { font-weight: 500; }

/* ---- Docs: three-column layout ---- */

.doc {
  display: grid;
  grid-template-columns: var(--nav-w) minmax(0, 1fr) var(--toc-w);
  gap: 3rem;
  align-items: start;
}

/* Scrollable panels get a thin, theme-aware bar (WebKit + Firefox). */
.doc-sidebar,
.doc-toc,
.search-modal-results {
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
  scrollbar-gutter: stable;
}
.doc-sidebar::-webkit-scrollbar,
.doc-toc::-webkit-scrollbar,
.search-modal-results::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
.doc-sidebar::-webkit-scrollbar-track,
.doc-toc::-webkit-scrollbar-track,
.search-modal-results::-webkit-scrollbar-track {
  background: transparent;
}
.doc-sidebar::-webkit-scrollbar-thumb,
.doc-toc::-webkit-scrollbar-thumb,
.search-modal-results::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}
.doc-sidebar:hover::-webkit-scrollbar-thumb,
.doc-toc:hover::-webkit-scrollbar-thumb,
.search-modal-results:hover::-webkit-scrollbar-thumb {
  background: var(--border-strong);
}

/* Left sidebar */
.doc-sidebar {
  position: sticky;
  top: calc(var(--header-h) + 1rem);
  max-height: calc(100vh - var(--header-h) - 2rem);
  overflow-y: auto;
  padding-right: 1rem;
  font-size: 0.9rem;
  border-right: 1px solid var(--border);
}
.doc-sidebar-title {
  font-weight: 600;
  color: var(--fg);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
}
.doc-section + .doc-section { margin-top: 1.4rem; }
.doc-section-name {
  color: var(--fg-subtle);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.4rem;
  font-weight: 600;
}
.doc-sidebar-nav ol { list-style: none; padding: 0; margin: 0; }
.doc-sidebar-nav li { margin: 0.15rem 0; }
.doc-sidebar-nav li a {
  color: var(--fg-muted);
  border-bottom: none;
  display: block;
  padding: 0.3rem 0.6rem;
  margin-left: -0.6rem;
  border-radius: var(--radius-sm);
  line-height: 1.35;
  font-weight: 400;
}
.doc-sidebar-nav li a:hover { color: var(--fg); background: var(--bg-elev); }
.doc-sidebar-nav li.active a {
  color: var(--accent);
  background: var(--brand-tint);
  font-weight: 500;
}

/* Body */
.doc-body { min-width: 0; max-width: var(--max-w); }
.doc-header { margin-bottom: 2.25rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--border); }
.doc-header h1 { margin: 0.4rem 0 0; letter-spacing: -0.028em; font-size: var(--step-5); font-weight: 700; }
.doc-eyebrow {
  color: var(--fg-subtle);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.doc-prose .header-anchor {
  color: inherit;
  border-bottom: none;
  position: relative;
}
.doc-prose .header-anchor::before {
  content: "#";
  position: absolute;
  left: -1.25rem;
  color: var(--fg-subtle);
  opacity: 0;
  transition: opacity 0.12s ease;
  font-weight: 400;
}
.doc-prose h2:hover .header-anchor::before,
.doc-prose h3:hover .header-anchor::before,
.doc-prose h4:hover .header-anchor::before { opacity: 1; }

/* Prev/Next */
.doc-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border);
}
.doc-pager-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.95rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  color: var(--fg);
  border-bottom: 1px solid var(--border);
  transition: border-color 0.12s ease, transform 0.12s ease, box-shadow 0.12s ease;
}
.doc-pager-item:hover {
  border-color: var(--border-strong);
  border-bottom-color: var(--border-strong);
  color: var(--fg);
  box-shadow: var(--shadow-md);
}
.doc-pager-next { text-align: right; align-items: flex-end; }
.doc-pager-label {
  color: var(--fg-subtle);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}
.doc-pager-title { font-weight: 500; }

/* Right TOC */
.doc-toc {
  position: sticky;
  top: calc(var(--header-h) + 1rem);
  max-height: calc(100vh - var(--header-h) - 2rem);
  overflow-y: auto;
  font-size: 0.85rem;
  padding-left: 1rem;
  border-left: 1px solid var(--border);
}
.doc-toc-title {
  color: var(--fg-subtle);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.7rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}
.doc-toc ol { list-style: none; padding: 0; margin: 0; }
.doc-toc li { margin: 0.15rem 0; }
.doc-toc li a {
  color: var(--fg-muted);
  border-bottom: none;
  display: block;
  padding: 0.15rem 0.5rem;
  margin-left: -0.5rem;
  border-radius: 3px;
  border-left: 2px solid transparent;
  padding-left: 0.7rem;
  line-height: 1.4;
  font-weight: 400;
}
.doc-toc li a:hover { color: var(--fg); }
.doc-toc li.doc-toc-h3 a { padding-left: 1.4rem; font-size: 0.82rem; color: var(--fg-subtle); }
.doc-toc li a.active {
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 500;
}

/* ---- Search ---- */

.search-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--fg-muted);
  border-radius: 8px;
  padding: 0.35rem 0.5rem 0.35rem 0.7rem;
  cursor: pointer;
  font: inherit;
  font-size: 0.85rem;
  line-height: 1;
  min-width: 190px;
  transition: color 0.12s ease, border-color 0.12s ease, background 0.12s ease;
}
.search-trigger:hover { color: var(--fg); border-color: var(--border-strong); }
.search-trigger-label { flex: 1; text-align: left; }
.search-trigger-kbd,
.search-modal-kbd {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background: var(--bg);
  color: var(--fg-subtle);
  padding: 0.15rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  line-height: 1;
}

@media (max-width: 640px) {
  .search-trigger { min-width: 0; padding: 0.35rem 0.5rem; }
  .search-trigger-label, .search-trigger-kbd { display: none; }
}

.search-modal {
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--fg);
  border-radius: 12px;
  padding: 0;
  width: min(600px, calc(100vw - 2rem));
  max-height: min(70vh, 640px);
  margin: 10vh auto 0;
  box-shadow: var(--shadow-md), 0 20px 60px rgba(0, 0, 0, 0.4);
}
.search-modal::backdrop {
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(4px);
}
.search-modal-form { display: flex; flex-direction: column; max-height: min(70vh, 640px); }
.search-modal-input-wrap {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border);
  color: var(--fg-subtle);
}
.search-modal-input {
  flex: 1;
  background: transparent;
  border: 0;
  outline: 0;
  font: inherit;
  color: var(--fg);
  font-size: 1rem;
  padding: 0;
}
.search-modal-input::placeholder { color: var(--fg-subtle); }
.search-modal-results {
  overflow-y: auto;
  padding: 0.4rem;
  min-height: 3rem;
}
.search-modal-hint,
.search-modal-error {
  color: var(--fg-subtle);
  padding: 1rem;
  font-size: 0.9rem;
  text-align: center;
}
.search-modal-result { margin: 0; }
.search-modal-result a {
  display: block;
  padding: 0.7rem 0.85rem;
  border-radius: 6px;
  border-bottom: 0;
  color: inherit;
}
.search-modal-result.is-active a,
.search-modal-result a:hover { background: var(--brand-tint); color: var(--fg); }
.search-modal-result-title { font-weight: 500; margin-bottom: 0.2rem; }
.search-modal-result-excerpt {
  color: var(--fg-muted);
  font-size: 0.85rem;
  line-height: 1.4;
}
.search-modal-result-excerpt mark {
  background: transparent;
  color: var(--accent);
  font-weight: 600;
}

/* Responsive */
@media (max-width: 1200px) {
  .doc { grid-template-columns: var(--nav-w) minmax(0, 1fr); gap: 2.5rem; }
  .doc-toc { display: none; }
}
@media (max-width: 800px) {
  .doc { grid-template-columns: 1fr; gap: 1.5rem; }
  .doc-sidebar {
    position: static;
    max-height: none;
    padding: 1rem 1.25rem;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-right: 1px solid var(--border);
    border-radius: var(--radius);
  }
  .doc-pager { grid-template-columns: 1fr; }
  .doc-pager-next { text-align: left; align-items: flex-start; }
}