/* Alcor Docs — design tokens + shell + prose, mirroring the Alcor Insights
   design system (blog.alcor.finance). Dark default, light via toggle. */

/* ── Tokens ────────────────────────────────────────────────────── */
:root {
  color-scheme: dark;

  --bg-0: #0a0a0b;
  --bg-1: #0f0f12;
  --bg-2: #131318;
  --bg-3: #1a1a20;
  --bg-elev: rgba(255, 255, 255, 0.03);
  --bg-hover: rgba(255, 255, 255, 0.04);

  --line: rgba(255, 255, 255, 0.07);
  --line-strong: rgba(255, 255, 255, 0.14);

  --fg: #f0eee9;
  --fg-2: #b8b5ad;
  --fg-3: #7a7872;
  --fg-prose: #e6e3dc;

  --alcor-purple: #a78bfa;
  --alcor-blue: #5b8def;
  --alcor-teal: #2dd4bf;
  --alcor-amber: #f5a524;
  --alcor-green: #4ade80;
  --alcor-rose: #f87171;

  --grad-cta: linear-gradient(135deg, #a78bfa 0%, #5b8def 100%);
  --grad-cta-hover: linear-gradient(135deg, #b49dfb 0%, #6e9cf2 100%);

  --font-display: 'Inter', -apple-system, system-ui, sans-serif;
  --font-sans: 'Inter', -apple-system, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    color-scheme: light;
    --bg-0: #fbfaf6; --bg-1: #f4f2ec; --bg-2: #ecebe5; --bg-3: #e4e1d9;
    --bg-elev: rgba(0, 0, 0, 0.025); --bg-hover: rgba(0, 0, 0, 0.04);
    --line: rgba(20, 20, 24, 0.09); --line-strong: rgba(20, 20, 24, 0.18);
    --fg: #1a1a1c; --fg-2: #4d4b48; --fg-3: #807d76; --fg-prose: #1f1f22;
    --alcor-purple: #7c5af0; --alcor-blue: #2f6ddc; --alcor-teal: #0d9d8a;
    --alcor-amber: #c87a05; --alcor-green: #2c9a4a; --alcor-rose: #d6443f;
  }
}
:root[data-theme='dark'] { color-scheme: dark; }
:root[data-theme='light'] {
  color-scheme: light;
  --bg-0: #fbfaf6; --bg-1: #f4f2ec; --bg-2: #ecebe5; --bg-3: #e4e1d9;
  --bg-elev: rgba(0, 0, 0, 0.025); --bg-hover: rgba(0, 0, 0, 0.04);
  --line: rgba(20, 20, 24, 0.09); --line-strong: rgba(20, 20, 24, 0.18);
  --fg: #1a1a1c; --fg-2: #4d4b48; --fg-3: #807d76; --fg-prose: #1f1f22;
  --alcor-purple: #7c5af0; --alcor-blue: #2f6ddc; --alcor-teal: #0d9d8a;
  --alcor-amber: #c87a05; --alcor-green: #2c9a4a; --alcor-rose: #d6443f;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg-0); }
body {
  font-family: var(--font-sans);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11";
  word-wrap: break-word;
  overflow-wrap: break-word;
  transition: background-color 0.2s ease, color 0.2s ease;
}
a { color: inherit; text-decoration: none; }
.tnum { font-variant-numeric: tabular-nums; }
.sr-only {
  border: 0; padding: 0; margin: 0; position: absolute !important;
  height: 1px; width: 1px; overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px); clip-path: inset(50%); white-space: nowrap;
}

/* ── Page shell ────────────────────────────────────────────────── */
.page {
  width: 100%; min-height: 100vh; display: flex;
  background: var(--bg-0); color: var(--fg); font-family: var(--font-sans);
}
.content { flex: 1; min-width: 0; }

/* ── Sidebar ───────────────────────────────────────────────────── */
.sidebar {
  width: 232px; flex-shrink: 0; border-right: 1px solid var(--line);
  padding: 22px 0; display: flex; flex-direction: column;
  background: var(--bg-0); position: sticky; top: 0; align-self: flex-start; height: 100vh;
}
.brand { padding: 0 22px 22px; display: flex; align-items: center; gap: 10px; }
.brand-text { line-height: 1.1; }
.brand-name { font-weight: 700; font-size: 15px; color: var(--fg); letter-spacing: -0.2px; }
.brand-sub { font-size: 11px; color: var(--fg-3); font-family: var(--font-mono); letter-spacing: 0.5px; }

.section-label {
  padding: 20px 22px 8px; font-size: 10px; color: var(--fg-3);
  font-family: var(--font-mono); letter-spacing: 1px; text-transform: uppercase;
}
.nav-block { display: flex; flex-direction: column; gap: 1px; padding: 0 12px; }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: 7px; color: var(--fg-2);
  font-size: 13.5px; line-height: 1.3;
  transition: background 0.15s ease, color 0.15s ease;
}
.nav-item:hover { color: var(--fg); background: var(--bg-hover); }
.nav-item.active { color: var(--fg); background: rgba(139, 122, 250, 0.1); }
.nav-item .icon { width: 14px; color: var(--fg-3); font-size: 11px; text-align: center; }
.nav-item.active .icon { color: var(--alcor-purple); }
.nav-item.soon { color: var(--fg-3); cursor: default; }
.nav-item.soon:hover { background: transparent; color: var(--fg-3); }
.nav-item .badge {
  margin-left: auto; font-size: 9px; font-family: var(--font-mono);
  color: var(--fg-3); border: 1px solid var(--line); border-radius: 4px;
  padding: 1px 5px; text-transform: uppercase; letter-spacing: 0.4px;
}
.spacer { flex: 1; }
.footer-block {
  padding: 16px 22px; border-top: 1px solid var(--line);
  font-size: 11px; color: var(--fg-3); line-height: 1.6; font-family: var(--font-mono);
}
.footer-block a { color: var(--fg-2); }
.footer-block a:hover { color: var(--fg); }

.sidebar-backdrop { display: none; }

/* ── Topbar ────────────────────────────────────────────────────── */
.topbar {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 32px; border-bottom: 1px solid var(--line);
  background: var(--bg-0); position: sticky; top: 0; z-index: 5;
}
.burger {
  display: none; background: transparent; border: 1px solid var(--line-strong);
  color: var(--fg); width: 34px; height: 34px; border-radius: 8px;
  align-items: center; justify-content: center; cursor: pointer; padding: 0; flex-shrink: 0;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.burger:hover { background: var(--bg-hover); }
.burger svg { display: block; }
.burger svg[data-burger='close'] { display: none; }
:root[data-sidebar-open] .burger svg[data-burger='open'] { display: none; }
:root[data-sidebar-open] .burger svg[data-burger='close'] { display: block; }

.mobile-brand { display: none; align-items: center; gap: 8px; color: var(--fg); font-weight: 600; font-size: 14px; }

.search { flex: 1; position: relative; max-width: 460px; }
.search input {
  width: 100%; background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: 8px; color: var(--fg); font-size: 13px; padding: 8px 12px 8px 32px;
  font-family: inherit; outline: none; transition: border-color 0.15s ease, background 0.15s ease;
}
.search input::placeholder { color: var(--fg-3); }
.search input:focus { border-color: var(--line-strong); background: var(--bg-hover); }
.search-icon { position: absolute; left: 11px; top: 13px; color: var(--fg-3); font-size: 12px; pointer-events: none; }
.kbd {
  position: absolute; right: 8px; top: 9px; color: var(--fg-3); font-size: 10px;
  font-family: var(--font-mono); border: 1px solid var(--line); padding: 1px 5px; border-radius: 3px; pointer-events: none;
}
.results {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0;
  background: var(--bg-1); border: 1px solid var(--line-strong); border-radius: 10px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35); overflow: hidden; z-index: 20;
}
.results ul { list-style: none; margin: 0; padding: 6px; }
.results .empty { padding: 18px 14px; color: var(--fg-3); font-size: 13px; font-family: var(--font-mono); }
.results .result a {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: 6px; color: var(--fg); font-size: 13.5px; line-height: 1.3;
}
.results .result.active a, .results .result a:hover { background: var(--bg-hover); }
.results .r-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.results .r-sec { font-family: var(--font-mono); font-size: 10.5px; color: var(--fg-3); text-transform: uppercase; letter-spacing: 0.5px; }

.spacer-x { flex: 1; }
.theme-toggle {
  background: transparent; border: 1px solid var(--line-strong); color: var(--fg-2);
  width: 32px; height: 32px; padding: 0; border-radius: 8px; display: inline-flex;
  align-items: center; justify-content: center; cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.theme-toggle:hover { background: var(--bg-hover); color: var(--fg); border-color: var(--fg-3); }
.theme-toggle svg[data-icon='moon'] { display: block; }
.theme-toggle svg[data-icon='sun'] { display: none; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) .theme-toggle svg[data-icon='moon'] { display: none; }
  :root:not([data-theme]) .theme-toggle svg[data-icon='sun'] { display: block; }
}
:root[data-theme='light'] .theme-toggle svg[data-icon='moon'] { display: none; }
:root[data-theme='light'] .theme-toggle svg[data-icon='sun'] { display: block; }
:root[data-theme='dark'] .theme-toggle svg[data-icon='moon'] { display: block; }
:root[data-theme='dark'] .theme-toggle svg[data-icon='sun'] { display: none; }

.btn {
  border-radius: 8px; padding: 7px 14px; font-size: 12.5px; cursor: pointer;
  font-family: inherit; line-height: 1.5;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn.ghost { background: transparent; border: 1px solid var(--line-strong); color: var(--fg); }
.btn.ghost:hover { background: var(--bg-hover); }
.btn.cta { background: var(--grad-cta); border: none; color: #fff; font-weight: 500; }
.btn.cta:hover { background: var(--grad-cta-hover); }

/* ── Reading progress ──────────────────────────────────────────── */
.reading-progress { position: sticky; top: 0; height: 2px; background: var(--line); z-index: 4; }
.reading-progress .bar { height: 100%; width: 0; background: var(--grad-cta); transition: width 0.1s linear; }

/* ── Article layout ────────────────────────────────────────────── */
.page-inner { max-width: 1180px; margin: 0 auto; padding: 40px 56px 100px; }
.breadcrumb {
  display: flex; align-items: center; gap: 8px; font-size: 11.5px; color: var(--fg-3);
  font-family: var(--font-mono); margin-bottom: 26px; flex-wrap: wrap;
}
.breadcrumb .crumb { color: var(--fg-2); }
.breadcrumb .crumb:hover { color: var(--fg); }
.breadcrumb .crumb.current { color: var(--fg); }
.breadcrumb .sep { color: var(--fg-3); }

.layout { display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 64px; }
.main-col { min-width: 0; }

.cat-row { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; }
.cat-dot { width: 6px; height: 6px; border-radius: 50%; display: inline-block; flex-shrink: 0; background: var(--alcor-purple); }
.cat-label { font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.8px; color: var(--fg-2); }

.title { font-family: var(--font-display); font-size: 40px; font-weight: 700; color: var(--fg); margin: 0 0 14px; letter-spacing: -1px; line-height: 1.08; }
.dek { font-size: 18px; line-height: 1.6; color: var(--fg-2); margin: 0 0 22px; max-width: 68ch; letter-spacing: -0.2px; }

.meta-strip {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding-bottom: 26px; margin-bottom: 8px; border-bottom: 1px solid var(--line);
  font-size: 12.5px; color: var(--fg-2);
}
.meta-strip .byline-mark { display: inline-flex; }
.meta-strip .dot-sep { color: var(--fg-3); }
.meta-strip .meta-text { color: var(--fg-2); font-family: var(--font-mono); font-size: 11.5px; }

/* ── Prose ─────────────────────────────────────────────────────── */
.prose { color: var(--fg-prose); max-width: 74ch; }
.prose p, .prose ul, .prose ol {
  font-family: var(--font-sans); font-size: 16.5px; line-height: 1.75;
  color: var(--fg-prose); margin: 0 0 18px; text-wrap: pretty; font-weight: 400; letter-spacing: -0.005em;
}
.prose li { margin-bottom: 6px; }
.prose li > p { margin-bottom: 8px; }
.prose h2 {
  font-family: var(--font-display); font-size: 25px; font-weight: 600; color: var(--fg);
  margin: 52px 0 14px; letter-spacing: -0.5px; scroll-margin-top: 88px;
  padding-top: 14px; border-top: 1px solid var(--line);
}
.prose h2:first-of-type { border-top: none; padding-top: 0; margin-top: 8px; }
.prose h3 {
  font-family: var(--font-display); font-size: 18px; font-weight: 600; color: var(--fg);
  margin: 30px 0 10px; letter-spacing: -0.2px; scroll-margin-top: 88px;
}
.prose h2 .h-num {
  font-family: var(--font-mono); font-size: 14px; font-weight: 500;
  color: var(--alcor-purple); margin-right: 12px; letter-spacing: 0;
}
.prose strong { color: var(--fg); font-weight: 600; }
.prose a { color: var(--alcor-purple); border-bottom: 1px solid rgba(167, 139, 250, 0.35); }
.prose a:hover { color: var(--alcor-blue); border-bottom-color: rgba(91, 141, 239, 0.6); }
.prose ul, .prose ol { padding-left: 22px; }
.prose ul li::marker { color: var(--fg-3); }
.prose ol li::marker { color: var(--fg-3); font-family: var(--font-mono); font-size: 0.9em; }

.prose code {
  font-family: var(--font-mono); font-size: 0.9em; padding: 1px 6px;
  background: rgba(139, 122, 250, 0.08); border: 1px solid var(--line); border-radius: 4px; color: var(--fg);
}
.prose pre {
  background: var(--bg-1); border: 1px solid var(--line); border-radius: 10px; color: var(--fg);
  padding: 16px 18px; overflow-x: auto; font-size: 13px; line-height: 1.6; margin: 20px 0;
  font-family: var(--font-mono);
}
.prose pre code { background: transparent; border: none; padding: 0; color: inherit; font-size: inherit; }
.prose blockquote {
  margin: 26px 0; padding: 4px 0 4px 22px; border-left: 2px solid var(--alcor-purple);
  font-size: 17px; line-height: 1.6; color: var(--fg); font-weight: 500; letter-spacing: -0.2px;
}
.prose blockquote p { margin: 0; }
.prose hr { border: none; border-top: 1px solid var(--line); margin: 40px 0; }

/* Callout — for the "isolated agreement" mental model + important notes */
.note {
  margin: 24px 0; padding: 16px 18px; border: 1px solid var(--line-strong);
  border-left: 3px solid var(--alcor-blue); border-radius: 10px; background: var(--bg-elev);
}
.note p { margin: 0; font-size: 15.5px; line-height: 1.65; color: var(--fg-2); }
.note strong { color: var(--fg); }

/* ── Right rail (Contents) ─────────────────────────────────────── */
.rail { position: relative; }
.rail-inner { position: sticky; top: 88px; display: flex; flex-direction: column; gap: 18px; }
.rail-card { border: 1px solid var(--line); border-radius: 12px; background: var(--bg-1); padding: 16px 16px 18px; }
.rail-label {
  font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 1px;
  color: var(--fg-3); margin-bottom: 12px;
}
.toc { display: flex; flex-direction: column; gap: 1px; max-height: 60vh; overflow-y: auto; }
.toc-item {
  display: grid; grid-template-columns: auto 1fr; gap: 9px; align-items: baseline;
  padding: 5px 8px; border-radius: 6px; color: var(--fg-3); font-size: 12.5px; line-height: 1.35;
  transition: color 0.15s ease, background 0.15s ease;
}
.toc-item:hover { color: var(--fg-2); background: var(--bg-hover); }
.toc-item.active { color: var(--fg); background: rgba(139, 122, 250, 0.1); }
.toc-item .toc-num { font-family: var(--font-mono); font-size: 10.5px; color: var(--fg-3); }
.toc-item.active .toc-num { color: var(--alcor-purple); }

.rail-cta { display: block; text-align: center; margin-top: 2px; padding: 9px 12px; border-radius: 8px; background: var(--grad-cta); color: #fff; font-size: 13px; font-weight: 500; }
.rail-cta:hover { background: var(--grad-cta-hover); }
.rail-copy { font-size: 13px; line-height: 1.55; color: var(--fg-2); margin: 0 0 12px; }

/* ── Responsive ────────────────────────────────────────────────── */
@media (max-width: 1080px) {
  .layout { grid-template-columns: 1fr; gap: 0; }
  .rail { display: none; }
  .page-inner { padding: 36px 40px 90px; }
}
@media (max-width: 880px) {
  .topbar { padding: 12px 14px; gap: 10px; }
  .burger { display: inline-flex; }
  .mobile-brand { display: inline-flex; }
  .search { max-width: none; }
  .btn.ghost { display: none; }
  .theme-toggle { width: 34px; height: 34px; }
  .page-inner { padding: 28px 20px 80px; }
  .title { font-size: 31px; }

  .sidebar {
    position: fixed; top: 0; left: 0; bottom: 0; z-index: 50;
    width: min(86vw, 300px); height: 100dvh; background: var(--bg-0);
    border-right: 1px solid var(--line); transform: translateX(-100%);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55); overflow-y: auto;
  }
  :root[data-sidebar-open] .sidebar { transform: translateX(0); }
  .sidebar-backdrop {
    display: block; position: fixed; inset: 0; background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(2px); z-index: 40; opacity: 0; pointer-events: none; transition: opacity 0.2s ease;
  }
  :root[data-sidebar-open] .sidebar-backdrop { opacity: 1; pointer-events: auto; }
}
@media (max-width: 560px) { .search { display: none; } }