/* ============================================================
   Sibyl / Aperture Technologies
   Design tokens + component styles + dynamic polish v1.8
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=DM+Mono:wght@400;500&family=Instrument+Serif:ital@0;1&display=swap');

/* ---------- Theme tokens ---------- */
:root,
:root[data-theme="dark"] {
  --bg:           #2b2622;
  --bg-elevated:  #383330;
  --bg-sunken:    #221e1b;
  --ink:          #f7f5f0;
  --ink-mute:     #aea69c;
  --ink-dim:      #6f6862;
  --line:         #3f3a36;
  --line-soft:    #322d2a;
  --accent:       rgb(217 119 87);
  --accent-rgb:   217, 119, 87;
  --accent-soft:  rgba(217, 119, 87, 0.12);
  --accent-line:  rgba(217, 119, 87, 0.32);
  --good:         #7fb069;
  --warn:         #d4a747;
  --mark-bg:      transparent;
  --mark-stroke:  #f7f5f0;
  --mark-pupil:   #f7f5f0;
  --hero-vignette: radial-gradient(ellipse at 30% 20%, rgba(217,119,87,0.06) 0%, rgba(217,119,87,0) 55%),
                   radial-gradient(ellipse at 80% 80%, rgba(247,245,240,0.025) 0%, rgba(247,245,240,0) 60%);
}

:root[data-theme="light"] {
  --bg:           #f5f2eb;
  --bg-elevated:  #eee9df;
  --bg-sunken:    #ebe6da;
  --ink:          #2b2622;
  --ink-mute:     #6f6862;
  --ink-dim:      #948b82;
  --line:         #d6cfc2;
  --line-soft:    #e0d9cb;
  --accent:       rgb(196 102 70);
  --accent-rgb:   196, 102, 70;
  --accent-soft:  rgba(196, 102, 70, 0.08);
  --accent-line:  rgba(196, 102, 70, 0.30);
  --good:         #5d8a4a;
  --warn:         #b8902f;
  --mark-bg:      transparent;
  --mark-stroke:  #2b2622;
  --mark-pupil:   #2b2622;
  --hero-vignette: radial-gradient(ellipse at 30% 20%, rgba(196,102,70,0.05) 0%, rgba(196,102,70,0) 55%),
                   radial-gradient(ellipse at 80% 80%, rgba(43,38,34,0.025) 0%, rgba(43,38,34,0) 60%);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 200ms ease, color 200ms ease;
}

html { scroll-behavior: smooth; }

img, svg { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; }
a { color: inherit; text-decoration: none; }

/* ---------- Type ---------- */
.serif      { font-family: 'Instrument Serif', Georgia, serif; font-style: italic; font-weight: 400; letter-spacing: -0.01em; }
.mono       { font-family: 'DM Mono', 'JetBrains Mono', ui-monospace, monospace; }
.microlabel { text-transform: uppercase; letter-spacing: 0.08em; font-size: 11px; font-weight: 500; color: var(--ink-mute); }
.numeric    { font-family: 'DM Mono', monospace; font-variant-numeric: tabular-nums; }

h1, h2, h3, h4 { margin: 0; font-weight: 500; letter-spacing: -0.015em; }

/* ---------- Sibyl mark (inline, theme-aware) ---------- */
.sibyl-mark { display: block; flex-shrink: 0; }
.sibyl-mark rect.bg { fill: var(--mark-bg); }
.sibyl-mark g.arcs { stroke: var(--mark-stroke); fill: none; stroke-width: 9; stroke-linecap: round; }
.sibyl-mark g.pupils { fill: var(--mark-pupil); stroke: none; }

/* ---------- Layout ---------- */
.shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-soft);
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  max-width: 1200px;
  margin: 0 auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand .sibyl-mark { width: 26px; height: 26px; }
.brand-name {
  font-family: 'Instrument Serif', Georgia, serif;
  font-style: italic;
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--ink);
  line-height: 1;
}
.brand-sub {
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-top: 2px;
}
.topbar-nav { display: flex; gap: 16px; align-items: center; }
.topbar-nav a.nav-link {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
  padding: 6px 0;
  position: relative;
  transition: color 150ms ease;
}
.topbar-nav a.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 220ms ease;
}
.topbar-nav a.nav-link:hover { color: var(--ink); }
.topbar-nav a.nav-link:hover::after { transform: scaleX(1); }
.topbar-nav a.nav-link.active { color: var(--ink); }
.topbar-nav a.nav-link.active::after { transform: scaleX(1); background: var(--accent); }

/* ---------- Theme toggle ---------- */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: background 150ms ease, border-color 150ms ease;
}
.theme-toggle:hover { background: var(--bg-elevated); border-color: var(--accent-line); }
.theme-toggle svg { width: 16px; height: 16px; stroke: currentColor; stroke-width: 1.5; fill: none; }
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
:root[data-theme="light"] .theme-toggle .icon-sun  { display: block; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 96px 0 80px;
  overflow: hidden;
  isolation: isolate;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -40px;
  z-index: -1;
  background: var(--hero-vignette);
  animation: vignette-drift 18s ease-in-out infinite;
}
@keyframes vignette-drift {
  0%, 100% { transform: translate(0, 0); }
  50%      { transform: translate(40px, -30px); }
}
.hero-wordmark {
  display: flex;
  align-items: center;
  gap: 28px;
}
.hero-wordmark .sibyl-mark {
  width: clamp(72px, 9vw, 132px);
  height: clamp(72px, 9vw, 132px);
}
.hero-wordmark h1 {
  font-family: 'Instrument Serif', Georgia, serif;
  font-style: italic;
  font-weight: 400;
  font-size: clamp(120px, 18vw, 232px);
  line-height: 0.92;
  letter-spacing: -0.035em;
  color: var(--ink);
}
.hero-sub {
  margin-top: 36px;
  max-width: 620px;
  font-size: 19px;
  line-height: 1.5;
  color: var(--ink-mute);
  font-weight: 400;
}
.hero-sub strong { color: var(--ink); font-weight: 500; }
.hero-cta {
  margin-top: 44px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}
.hero-meta {
  margin-top: 56px;
  display: flex;
  flex-wrap: wrap;
  gap: 32px 48px;
  padding-top: 28px;
  border-top: 1px solid var(--line-soft);
}
.hero-meta div { display: flex; flex-direction: column; gap: 6px; }
.hero-meta .val { font-family: 'DM Mono', monospace; font-size: 15px; color: var(--ink); font-variant-numeric: tabular-nums; }

/* ---------- Hero animations ---------- */
.hero-wordmark h1 {
  opacity: 0;
  transform: translateY(14px) scale(0.97);
  animation: hero-word-in 700ms cubic-bezier(.2,.7,.2,1) 80ms forwards;
}
@keyframes hero-word-in {
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.hero-wordmark .sibyl-mark .arcs path {
  stroke-dasharray: 140;
  stroke-dashoffset: 140;
  animation: arc-draw 900ms cubic-bezier(.5,.1,.2,1) 240ms forwards;
}
.hero-wordmark .sibyl-mark .arcs path:nth-child(2) {
  animation-delay: 380ms;
}
@keyframes arc-draw {
  to { stroke-dashoffset: 0; }
}
.hero-wordmark .sibyl-mark .pupils circle {
  opacity: 0;
  transform-box: fill-box;
  transform-origin: center;
  transform: scale(0);
  animation: pupil-pop 280ms cubic-bezier(.34,1.56,.64,1) 1080ms forwards;
}
.hero-wordmark .sibyl-mark .pupils circle:nth-child(2) {
  animation-delay: 1220ms;
}
@keyframes pupil-pop {
  to { opacity: 1; transform: scale(1); }
}
.hero-sub, .hero-cta, .hero-meta {
  opacity: 0;
  transform: translateY(10px);
  animation: hero-fade-up 500ms ease-out forwards;
}
.hero-sub  { animation-delay: 700ms; }
.hero-cta  { animation-delay: 880ms; }
.hero-meta { animation-delay: 1040ms; }
@keyframes hero-fade-up {
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 24px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: 4px;
  transition: filter 150ms ease, background 150ms ease, border-color 150ms ease, transform 150ms ease, box-shadow 220ms ease;
  text-decoration: none;
  position: relative;
}
.btn:hover { filter: brightness(1.08); }
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}
.btn-primary:hover {
  filter: brightness(1.10);
  box-shadow: 0 6px 24px -8px rgba(var(--accent-rgb), 0.5);
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { background: var(--bg-elevated); border-color: var(--accent-line); }
.btn-large { padding: 18px 28px; font-size: 15px; }
.btn .arrow {
  display: inline-flex;
  transition: transform 200ms ease;
}
.btn-primary .arrow {
  animation: arrow-cycle 2.6s ease-in-out infinite;
}
@keyframes arrow-cycle {
  0%, 100% { transform: translateX(0); }
  40%      { transform: translateX(4px); }
  55%      { transform: translateX(2px); }
}
.btn:hover .arrow { transform: translateX(5px); animation: none; }

/* ---------- Sections ---------- */
section { padding: 80px 0; }
.section-label {
  display: inline-block;
  margin-bottom: 16px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--ink-mute);
}
.section-title {
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--ink);
}
.section-title em {
  font-family: 'Instrument Serif', Georgia, serif;
  font-style: italic;
  font-weight: 400;
  color: var(--accent);
}
.section-lede {
  max-width: 640px;
  color: var(--ink-mute);
  font-size: 16px;
  margin-bottom: 48px;
}

/* ---------- Reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 600ms ease-out, transform 600ms cubic-bezier(.2,.7,.2,1);
  will-change: opacity, transform;
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Live stats row ---------- */
.stats-row {
  margin: 24px 0 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}
.stat-cell {
  background: var(--bg-elevated);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.stat-cell .stat-val {
  font-family: 'DM Mono', monospace;
  font-size: 34px;
  font-weight: 500;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  line-height: 1;
}
.stat-cell .stat-suffix {
  font-size: 18px;
  color: var(--accent);
  margin-left: 2px;
}
.stat-cell .stat-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-mute);
}

/* ---------- Feature grid (2x2) ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}
.feature-tile {
  background: var(--bg-elevated);
  padding: 36px 32px;
  position: relative;
  transition: background 200ms ease, box-shadow 220ms ease;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.feature-tile::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--accent);
  transition: width 220ms cubic-bezier(.2,.7,.2,1);
}
.feature-tile:hover::before { width: 4px; }
.feature-tile:hover {
  background: color-mix(in srgb, var(--bg-elevated) 92%, var(--accent) 8%);
  box-shadow: inset 0 0 0 1px rgba(var(--accent-rgb), 0.08);
}
.feature-tile .num {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: var(--ink-dim);
  letter-spacing: 0.12em;
  transition: color 200ms ease;
}
.feature-tile h3 {
  font-size: 22px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
  transition: transform 300ms ease-out, color 200ms ease;
}
.feature-tile:hover h3 { transform: translateX(4px); color: var(--accent); }
.feature-tile:hover .num { color: var(--accent); }
.feature-tile p {
  margin: 0;
  color: var(--ink-mute);
  font-size: 14.5px;
  line-height: 1.55;
}

/* ---------- Tier accordion (custom animated) ---------- */
.tiers {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.tier {
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg-elevated);
  overflow: hidden;
  transition: border-color 180ms ease;
}
.tier[data-open="true"] { border-color: var(--accent-line); }
.tier-summary {
  list-style: none;
  cursor: pointer;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  user-select: none;
  width: 100%;
  background: transparent;
  border: 0;
  text-align: left;
  color: inherit;
  font-family: inherit;
}
.tier-summary::-webkit-details-marker { display: none; }
.tier-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  flex-wrap: wrap;
}
.tier-badge {
  font-family: 'Instrument Serif', Georgia, serif;
  font-style: italic;
  font-size: 38px;
  line-height: 1;
  color: var(--accent);
  width: 32px;
}
.tier-name {
  font-size: 18px;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -0.005em;
}
.tier-pitch {
  color: var(--ink-mute);
  font-size: 14px;
  margin-left: 4px;
}
.tier-toggle {
  width: 28px;
  height: 28px;
  border: 1px solid var(--line);
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-mute);
  font-family: 'DM Mono', monospace;
  font-size: 14px;
  flex-shrink: 0;
  transition: border-color 200ms ease, color 200ms ease, transform 220ms cubic-bezier(.2,.7,.2,1);
}
.tier[data-open="true"] .tier-toggle {
  color: var(--accent);
  border-color: var(--accent-line);
  transform: rotate(90deg);
}
.tier-collapse {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 320ms cubic-bezier(.2,.7,.2,1);
}
.tier[data-open="true"] .tier-collapse {
  grid-template-rows: 1fr;
}
.tier-collapse > .tier-inner {
  overflow: hidden;
  min-height: 0;
}
.tier-body {
  padding: 4px 28px 28px;
  border-top: 1px solid var(--line-soft);
}
.tier-features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: 4px;
  margin-top: 20px;
  overflow: hidden;
}
.feature-row {
  background: var(--bg);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.feature-row .code {
  font-family: 'DM Mono', monospace;
  font-size: 10.5px;
  color: var(--accent);
  letter-spacing: 0.1em;
}
.feature-row .name {
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
}
.feature-row .desc {
  color: var(--ink-mute);
  font-size: 13px;
  line-height: 1.5;
}

/* ---------- System requirements ---------- */
.req-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}
.req-cell {
  background: var(--bg-elevated);
  padding: 24px 24px;
}
.req-cell .microlabel { margin-bottom: 8px; }
.req-cell .req-val {
  font-family: 'DM Mono', monospace;
  font-size: 15px;
  color: var(--ink);
}

/* ---------- CTA strip ---------- */
.cta-strip {
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg-elevated);
  padding: 48px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  position: relative;
  overflow: hidden;
}
.cta-strip::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 90% 30%, rgba(var(--accent-rgb), 0.08) 0%, transparent 60%);
  pointer-events: none;
}
.cta-strip > * { position: relative; }
.cta-strip h2 {
  font-size: 28px;
  margin: 0;
  color: var(--ink);
}
.cta-strip h2 em {
  font-family: 'Instrument Serif', Georgia, serif;
  font-style: italic;
  color: var(--accent);
}
.cta-strip p {
  margin: 6px 0 0;
  color: var(--ink-mute);
  font-size: 14px;
}

/* ---------- Footer ---------- */
footer {
  margin-top: 80px;
  border-top: 1px solid var(--line-soft);
  padding: 40px 0 60px;
  color: var(--ink-dim);
  font-size: 13px;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}
.footer-inner a { color: var(--ink-mute); transition: color 150ms ease; }
.footer-inner a:hover { color: var(--accent); }
.footer-meta {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: var(--ink-dim);
  letter-spacing: 0.05em;
}

/* ---------- Download page ---------- */
.dl-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.dl-card {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  position: relative;
  transition: border-color 220ms ease, transform 260ms cubic-bezier(.2,.7,.2,1), box-shadow 260ms ease;
}
.dl-card:hover {
  border-color: var(--accent-line);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px -20px rgba(var(--accent-rgb), 0.35);
}
.dl-card:hover .btn .arrow { transform: translateX(0) translateY(2px); }
.dl-card .microlabel { color: var(--ink-mute); }
.dl-card h3 {
  font-size: 24px;
  color: var(--ink);
  font-weight: 500;
}
.dl-card .file {
  font-family: 'DM Mono', monospace;
  font-size: 13px;
  color: var(--ink-mute);
  word-break: break-all;
}
.dl-size {
  font-family: 'Instrument Serif', Georgia, serif;
  font-style: italic;
  font-size: 64px;
  line-height: 1;
  color: var(--accent);
  letter-spacing: -0.02em;
  animation: pulse-soft 3.6s ease-in-out infinite;
}
@keyframes pulse-soft {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.78; }
}
.dl-meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
  margin-top: auto;
}
.dl-meta .kv {
  display: flex;
  gap: 12px;
  align-items: baseline;
}
.dl-meta .kv .k { color: var(--ink-dim); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; min-width: 64px; }
.dl-meta .kv .v { font-family: 'DM Mono', monospace; font-size: 12px; color: var(--ink-mute); word-break: break-all; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}
.step {
  background: var(--bg-elevated);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: background 180ms ease;
}
.step:hover { background: color-mix(in srgb, var(--bg-elevated) 90%, var(--accent) 10%); }
.step .step-num {
  font-family: 'Instrument Serif', Georgia, serif;
  font-style: italic;
  font-size: 44px;
  color: var(--accent);
  line-height: 1;
  transition: text-shadow 220ms ease;
}
.step:hover .step-num {
  text-shadow: 0 0 24px rgba(var(--accent-rgb), 0.35);
}
.step h4 { font-size: 16px; color: var(--ink); }
.step p { margin: 0; color: var(--ink-mute); font-size: 14px; line-height: 1.55; }
.step code {
  font-family: 'DM Mono', monospace;
  font-size: 12.5px;
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--ink);
  border: 1px solid var(--line-soft);
}

/* ---------- Keyboard chord hint ---------- */
.kbd-chord {
  margin-top: 56px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  text-align: center;
}
.kbd-chord .label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink-dim);
}
.kbd-row {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: 'DM Mono', monospace;
}
.kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-bottom-width: 3px;
  border-radius: 5px;
  background: var(--bg-elevated);
  color: var(--ink);
  font-size: 13px;
  letter-spacing: 0.06em;
  transition: transform 80ms ease, border-bottom-width 80ms ease, background 120ms ease;
}
.kbd.press {
  transform: translateY(2px);
  border-bottom-width: 1px;
  background: color-mix(in srgb, var(--bg-elevated) 80%, var(--accent) 20%);
}
.kbd-plus { color: var(--ink-dim); font-size: 14px; }

.notice {
  margin-top: 48px;
  padding: 20px 24px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  background: var(--bg-elevated);
  color: var(--ink-mute);
  font-size: 13.5px;
  line-height: 1.6;
}
.notice strong { color: var(--ink); font-weight: 500; }

/* ---------- Login ---------- */
.login-shell {
  min-height: calc(100vh - 80px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  background: var(--hero-vignette);
  position: relative;
  overflow: hidden;
}
.login-shell::before {
  content: "";
  position: absolute;
  inset: -40px;
  z-index: 0;
  background: var(--hero-vignette);
  animation: vignette-drift 18s ease-in-out infinite;
}
.login-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 40px 36px;
  display: flex;
  flex-direction: column;
  gap: 28px;
  position: relative;
  z-index: 1;
  box-shadow: 0 24px 60px -28px rgba(0, 0, 0, 0.35);
}
.login-card.shake {
  animation: form-shake 320ms ease-in-out;
}
@keyframes form-shake {
  0%, 100% { transform: translateX(0); }
  20%      { transform: translateX(-8px); }
  40%      { transform: translateX(7px); }
  60%      { transform: translateX(-5px); }
  80%      { transform: translateX(3px); }
}
.login-wordmark {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.login-wordmark .sibyl-mark { width: 56px; height: 56px; }
.login-wordmark .sibyl-mark .pupils circle {
  animation: pupil-breathe 4.4s ease-in-out infinite;
  transform-box: fill-box;
  transform-origin: center;
}
.login-wordmark .sibyl-mark .pupils circle:nth-child(2) {
  animation-delay: 2.2s;
}
@keyframes pupil-breathe {
  0%, 100% { opacity: 1;   transform: scale(1); }
  50%      { opacity: 0.35; transform: scale(0.85); }
}
.login-wordmark .name {
  font-family: 'Instrument Serif', Georgia, serif;
  font-style: italic;
  font-size: 64px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink);
}
.login-wordmark .sub {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
}
.field label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-mute);
}
.field input[type="password"],
.field input[type="text"] {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 12px 14px;
  font-family: 'DM Mono', monospace;
  font-size: 14px;
  color: var(--ink);
  outline: none;
  transition: border-color 180ms ease, box-shadow 180ms ease;
}
.field input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.18);
}
.field .field-hint {
  font-size: 11px;
  color: var(--ink-dim);
  letter-spacing: 0.04em;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 200ms ease, transform 200ms ease;
  pointer-events: none;
}
.field:focus-within .field-hint {
  opacity: 1;
  transform: translateY(0);
}
.error {
  color: var(--accent);
  font-size: 13px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  padding: 10px 14px;
  border-radius: 4px;
}
.login-foot {
  text-align: center;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

/* ---------- Status pill (live) ---------- */
.status-pill {
  position: fixed;
  bottom: 18px;
  right: 18px;
  z-index: 12;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px 8px 10px;
  background: color-mix(in srgb, var(--bg-elevated) 92%, transparent);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: 'DM Mono', monospace;
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: opacity 220ms ease, transform 220ms ease, border-color 180ms ease;
  opacity: 0;
  transform: translateY(10px);
  cursor: default;
  pointer-events: auto;
}
.status-pill.in { opacity: 1; transform: translateY(0); }
.status-pill .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--good);
  box-shadow: 0 0 0 0 var(--good);
  animation: dot-pulse 2.4s ease-in-out infinite;
}
.status-pill[data-status="degraded"] .dot { background: var(--warn); }
.status-pill[data-status="down"] .dot { background: var(--accent); }
.status-pill .latency {
  color: var(--ink-dim);
  margin-left: 4px;
  text-transform: none;
  letter-spacing: 0.02em;
}
@keyframes dot-pulse {
  0%   { box-shadow: 0 0 0 0   rgba(127, 176, 105, 0.50); }
  70%  { box-shadow: 0 0 0 8px rgba(127, 176, 105, 0); }
  100% { box-shadow: 0 0 0 0   rgba(127, 176, 105, 0); }
}

/* ============================================================
   Quickstart page
   ============================================================ */
.qs-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 56px;
  align-items: flex-start;
  padding: 56px 0 80px;
}
.qs-toc {
  position: sticky;
  top: 88px;
  align-self: flex-start;
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  border-left: 1px solid var(--line-soft);
  padding-left: 18px;
}
.qs-toc .toc-label {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 12px;
}
.qs-toc a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 6px 0;
  color: var(--ink-mute);
  transition: color 160ms ease, transform 200ms ease;
  position: relative;
}
.qs-toc a .toc-num {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: var(--ink-dim);
  min-width: 18px;
}
.qs-toc a::before {
  content: "";
  position: absolute;
  left: -18px;
  top: 50%;
  width: 2px;
  height: 0;
  background: var(--accent);
  transform: translateY(-50%);
  transition: height 200ms ease;
}
.qs-toc a:hover { color: var(--ink); }
.qs-toc a.active { color: var(--accent); }
.qs-toc a.active .toc-num { color: var(--accent); }
.qs-toc a.active::before { height: 18px; }

.qs-meta-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}
.qs-eyebrow {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--ink-mute);
}
.qs-readtime {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: var(--ink-dim);
  letter-spacing: 0.06em;
}
.qs-title {
  font-family: 'Instrument Serif', Georgia, serif;
  font-style: italic;
  font-size: clamp(48px, 6vw, 88px);
  line-height: 1.0;
  color: var(--ink);
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}
.qs-lede {
  color: var(--ink-mute);
  font-size: 17px;
  line-height: 1.55;
  max-width: 640px;
  margin: 0 0 56px;
}

.qs-section {
  margin: 0 0 64px;
  scroll-margin-top: 88px;
}
.qs-section-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}
.qs-num {
  font-family: 'Instrument Serif', Georgia, serif;
  font-style: italic;
  font-size: 52px;
  line-height: 1;
  color: var(--accent);
  flex-shrink: 0;
}
.qs-section h2 {
  font-size: 28px;
  color: var(--ink);
  margin: 0;
  letter-spacing: -0.015em;
}
.qs-section h3 {
  font-size: 17px;
  color: var(--ink);
  margin: 24px 0 10px;
}
.qs-section p {
  color: var(--ink-mute);
  font-size: 15.5px;
  line-height: 1.65;
  margin: 0 0 14px;
}
.qs-section a:not(.btn) {
  color: var(--accent);
  border-bottom: 1px solid var(--accent-line);
  transition: border-color 150ms ease;
}
.qs-section a:not(.btn):hover { border-color: var(--accent); }
.qs-section ul,
.qs-section ol {
  color: var(--ink-mute);
  font-size: 15.5px;
  line-height: 1.7;
  padding-left: 0;
  list-style: none;
  counter-reset: qsstep;
}
.qs-section ol > li {
  counter-increment: qsstep;
  position: relative;
  padding-left: 38px;
  margin: 0 0 10px;
}
.qs-section ol > li::before {
  content: counter(qsstep);
  position: absolute;
  left: 0;
  top: -2px;
  font-family: 'Instrument Serif', Georgia, serif;
  font-style: italic;
  font-size: 22px;
  line-height: 1;
  color: var(--accent);
}
.qs-section ul > li {
  position: relative;
  padding-left: 22px;
  margin: 0 0 8px;
}
.qs-section ul > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 1px;
  background: var(--accent);
}
.qs-section code {
  font-family: 'DM Mono', monospace;
  font-size: 13px;
  background: var(--bg-sunken);
  padding: 2px 7px;
  border-radius: 3px;
  color: var(--ink);
  border: 1px solid var(--line-soft);
}
.qs-section strong { color: var(--ink); font-weight: 500; }
.qs-codeblock {
  position: relative;
  background: #1f1c19;
  border: 1px solid #36312d;
  border-radius: 4px;
  padding: 18px 20px;
  margin: 14px 0 18px;
  font-family: 'DM Mono', monospace;
  font-size: 13px;
  line-height: 1.6;
  color: #e7e2d8;
  overflow-x: auto;
}
.qs-codeblock .code-lang {
  position: absolute;
  top: 8px;
  left: 14px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: rgb(217 119 87);
}
.qs-codeblock pre {
  margin: 18px 0 0;
  white-space: pre-wrap;
  word-break: break-word;
}
.qs-codeblock .copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: transparent;
  border: 1px solid #36312d;
  color: #aea69c;
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 4px 8px;
  border-radius: 3px;
  opacity: 0;
  transition: opacity 180ms ease, color 150ms ease, border-color 150ms ease;
  cursor: pointer;
}
.qs-codeblock:hover .copy-btn { opacity: 1; }
.qs-codeblock .copy-btn:hover { color: rgb(217 119 87); border-color: rgba(217, 119, 87, 0.5); }
.qs-codeblock .copy-btn.copied { color: rgb(217 119 87); border-color: rgba(217, 119, 87, 0.5); }

.qs-table-wrap { overflow-x: auto; margin: 14px 0 18px; }
.qs-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.qs-table th {
  text-align: left;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 500;
  color: var(--ink-dim);
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-sunken);
}
.qs-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--ink-mute);
  vertical-align: top;
}
.qs-table td:first-child {
  color: var(--ink);
  font-weight: 500;
  white-space: nowrap;
}
.qs-tip {
  display: flex;
  gap: 14px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--warn);
  background: color-mix(in srgb, var(--bg-elevated) 92%, var(--warn) 8%);
  border-radius: 4px;
  margin: 16px 0 18px;
  font-size: 14px;
  color: var(--ink-mute);
  line-height: 1.55;
}
.qs-tip .tag {
  font-family: 'Instrument Serif', Georgia, serif;
  font-style: italic;
  color: var(--warn);
  font-size: 16px;
  flex-shrink: 0;
}

.qs-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 20;
  background: transparent;
  pointer-events: none;
}
.qs-progress .bar {
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 80ms linear;
}

.qs-footer {
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--line-soft);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}
.qs-footer .qs-foot-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.qs-footer .qs-foot-brand .sibyl-mark { width: 24px; height: 24px; }
.qs-footer .qs-foot-name {
  font-family: 'Instrument Serif', Georgia, serif;
  font-style: italic;
  font-size: 22px;
  color: var(--ink);
}
.qs-footer .qs-foot-meta {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: var(--ink-dim);
  letter-spacing: 0.05em;
}

/* ---------- Quickstart search overlay ---------- */
.qs-search-overlay {
  position: fixed;
  inset: 0;
  background: color-mix(in srgb, #000 60%, transparent);
  z-index: 40;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 12vh 20px 0;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.qs-search-overlay.open { display: flex; }
.qs-search-card {
  width: 100%;
  max-width: 560px;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 24px 80px -16px rgba(0, 0, 0, 0.5);
  animation: search-in 180ms cubic-bezier(.2,.7,.2,1);
}
@keyframes search-in {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0); }
}
.qs-search-card input {
  width: 100%;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line-soft);
  padding: 18px 22px;
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  color: var(--ink);
  outline: none;
}
.qs-search-results {
  max-height: 50vh;
  overflow-y: auto;
}
.qs-search-results .qs-result {
  padding: 12px 22px;
  border-bottom: 1px solid var(--line-soft);
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 12px;
  transition: background 120ms ease;
}
.qs-search-results .qs-result:hover,
.qs-search-results .qs-result.sel {
  background: var(--bg);
}
.qs-search-results .qs-result .num {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: var(--accent);
}
.qs-search-results .qs-result .title {
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
}
.qs-search-results .qs-result .snippet {
  color: var(--ink-dim);
  font-size: 12px;
  margin-left: auto;
  max-width: 60%;
  text-align: right;
}
.qs-search-card .footer {
  padding: 10px 18px;
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  color: var(--ink-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-top: 1px solid var(--line-soft);
  display: flex;
  gap: 18px;
  justify-content: flex-end;
}

/* ---------- Responsive ---------- */
@media (max-width: 880px) {
  .shell { padding: 0 20px; }
  .topbar-inner { padding: 14px 20px; }
  .hero { padding: 56px 0 56px; }
  .hero-wordmark { gap: 16px; }
  .hero-wordmark h1 { font-size: clamp(96px, 22vw, 144px); }
  .hero-sub { font-size: 17px; }
  .feature-grid { grid-template-columns: 1fr; }
  .dl-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .cta-strip { padding: 32px 24px; }
  section { padding: 56px 0; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .stat-cell .stat-val { font-size: 28px; }
  .qs-layout { grid-template-columns: 1fr; gap: 24px; }
  .qs-toc {
    position: static;
    border-left: 0;
    border-top: 1px solid var(--line-soft);
    border-bottom: 1px solid var(--line-soft);
    padding: 14px 0;
    flex-direction: row;
    overflow-x: auto;
    gap: 18px;
  }
  .qs-toc a { white-space: nowrap; padding: 4px 0; }
  .qs-toc a::before { display: none; }
  .qs-toc .toc-label { display: none; }
  .topbar-nav { gap: 10px; }
  .topbar-nav a.nav-link { font-size: 10px; letter-spacing: 0.1em; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .hero::before { animation: none !important; }
  .login-shell::before { animation: none !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .hero-wordmark h1,
  .hero-sub,
  .hero-cta,
  .hero-meta { opacity: 1 !important; transform: none !important; animation: none !important; }
  .hero-wordmark .sibyl-mark .arcs path { stroke-dashoffset: 0 !important; animation: none !important; }
  .hero-wordmark .sibyl-mark .pupils circle { opacity: 1 !important; transform: none !important; animation: none !important; }
  .btn-primary .arrow { animation: none !important; }
  .status-pill .dot { animation: none !important; }
  .dl-size { animation: none !important; }
  .login-wordmark .sibyl-mark .pupils circle { animation: none !important; }
}

/* ---------- Print stylesheet (quickstart cheatsheet) ---------- */
@media print {
  :root, :root[data-theme="dark"], :root[data-theme="light"] {
    --bg: #ffffff; --bg-elevated: #ffffff; --bg-sunken: #fafafa;
    --ink: #000; --ink-mute: #333; --ink-dim: #666;
    --line: #ccc; --line-soft: #e5e5e5;
    --accent: #000;
  }
  body { color: #000; background: #fff; }
  .topbar, .qs-progress, .status-pill, .qs-search-overlay, .qs-toc,
  .qs-footer .btn, .copy-btn { display: none !important; }
  .qs-layout { grid-template-columns: 1fr; padding: 0; }
  .qs-section { page-break-inside: avoid; }
  .qs-codeblock { background: #f5f5f5; color: #000; border: 1px solid #ccc; }
  .qs-codeblock .code-lang { color: #555; }
  a { color: #000 !important; border-bottom: 0 !important; }
}