/* These attribute rules must outrank landing.css's :root/prefers-color-scheme block; with JS off, no attribute is set so landing's defaults win. */
html[data-theme="light"],
html[data-theme="paper"] {
  --bg:          #f7f6fe;
  --bg-grad:     radial-gradient(120% 80% at 50% -10%, color-mix(in srgb, var(--accent) 9%, transparent) 0%, transparent 55%), var(--bg);
  --panel:       #ffffff;
  --panel-alt:   #f3f0ff;
  --rule:        rgba(45,42,58,0.09);
  --rule-strong: rgba(45,42,58,0.16);
  --ink:         #2d2a3a;
  --ink-mid:     #4a4660;
  --ink-muted:   #6b6780;
  --ink-faint:   #9a96aa;
  --accent:      #ff5e8a;
  --accent-deep: #ff8a65;
  --accent-grad: linear-gradient(135deg, #ff8a65, #ff5e8a);
  --accent-soft: rgba(255,94,138,0.12);
  --send-text:   #ffffff;
  --shadow-md:   0 18px 50px rgba(45,42,58,0.10);
}
html[data-theme="dark"],
html[data-theme="night"] {
  --bg:          #15131c;
  --bg-grad:     radial-gradient(120% 80% at 50% -10%, color-mix(in srgb, var(--accent) 11%, transparent) 0%, transparent 55%), var(--bg);
  --panel:       #1d1a26;
  --panel-alt:   #251f33;
  --rule:        rgba(236,230,250,0.10);
  --rule-strong: rgba(236,230,250,0.20);
  --ink:         #ece6fa;
  --ink-mid:     #c3bcd6;
  --ink-muted:   #8e88a0;
  --ink-faint:   #5e5870;
  --accent:      #ff6f9c;
  --accent-deep: #ff8a65;
  --accent-grad: linear-gradient(135deg, #ff8a65, #ff5e8a);
  --accent-soft: rgba(255,111,156,0.18);
  --send-text:   #ffffff;
  --shadow-md:   0 18px 50px rgba(0,0,0,0.50);
}

/* Website pages are a single-screen, no-scroll contract: content flexes, slim footer pinned at bottom. */
html { height: 100%; }
body.how-page {
  margin: 0;
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  font-family: "Space Grotesk", system-ui, -apple-system, sans-serif;
  background: var(--bg-grad);
  color: var(--ink);
}
.how-main { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.vh {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0;
}
.dot { color: var(--accent); }
code {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  background: var(--panel-alt); padding: 1px 6px; border-radius: 4px;
  font-size: 0.92em; border: 1px solid var(--rule); color: var(--ink);
}

/* Top nav stays clear of the fixed settings gear (top-right). */
.landing-top { padding-right: clamp(86px, 8vw, 112px) !important; }

.hero {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  align-items: center;
  gap: clamp(32px, 5vw, 80px);
  padding: 0 clamp(28px, 7vw, 120px);
  overflow: hidden;
  background:
    radial-gradient(58% 70% at 22% 50%, var(--accent-soft) 0%, transparent 58%),
    var(--bg);
}
.hero-copy {
  display: flex; flex-direction: column;
  padding-left: clamp(16px, 5vw, 96px);
}
.eyebrow {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px; letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--ink-faint); margin: 0 0 18px;
}
.word {
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 144; font-weight: 500;
  font-size: clamp(58px, 10vw, 148px);
  line-height: 0.9; letter-spacing: -0.035em; margin: 0; color: var(--ink);
}
.sub {
  margin: 26px 0 0;
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 48; font-style: italic;
  font-size: clamp(17px, 1.7vw, 22px);
  line-height: 1.5; color: var(--ink-mid); max-width: 32ch;
}
.hero-cta { display: flex; align-items: center; gap: 18px; margin-top: 34px; }
.hero-btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 500; font-size: 15px;
  background: var(--accent); color: var(--send-text);
  padding: 13px 24px; border-radius: 999px; text-decoration: none;
  box-shadow: 0 10px 26px rgba(204,74,37,0.26);
  transition: transform 200ms ease, box-shadow 200ms ease;
}
.hero-btn:hover { transform: translateY(-2px); box-shadow: 0 14px 32px rgba(204,74,37,0.32); }
.hero-btn svg { stroke: currentColor; }
.hero-link {
  font-size: 14px; color: var(--ink-faint); text-decoration: none;
  border-bottom: 1px solid transparent;
}
.hero-link:hover { color: var(--ink-mid); border-bottom-color: var(--rule-strong); }
.hero-hud {
  margin: 38px 0 0;
  font-family: "JetBrains Mono", monospace;
  font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-faint);
}
.hnow { color: var(--accent); font-weight: 700; }

.hero-deck { position: relative; height: 100%; counter-reset: step; }
.hcard {
  counter-increment: step;
  position: absolute; top: 50%; left: 50%;
  width: clamp(320px, 34vw, 480px);
  padding: 30px 34px 30px;
  display: flex; flex-direction: column; gap: 16px;
  background:
    radial-gradient(140% 120% at 88% 6%, color-mix(in srgb, var(--accent) 26%, transparent) 0%, transparent 46%),
    radial-gradient(120% 110% at 8% 104%, color-mix(in srgb, var(--accent) 16%, transparent) 0%, transparent 52%),
    repeating-linear-gradient(122deg, transparent 0 27px, color-mix(in srgb, var(--accent) 7%, transparent) 27px 29px),
    linear-gradient(162deg, color-mix(in srgb, var(--panel) 100%, #000 10%) 0%, color-mix(in srgb, var(--panel) 100%, #000 22%) 100%);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--rule));
  border-radius: 18px;
  box-shadow: 0 34px 72px rgba(22,20,15,0.34);
  transform-origin: center center;
  transition:
    opacity 460ms ease,
    transform 620ms cubic-bezier(0.22,0.61,0.36,1),
    box-shadow 500ms ease, border-color 400ms ease;
  will-change: opacity, transform;
  overflow: hidden;
}
.hcard::before {
  content: "";
  position: absolute; top: 28px; right: 30px;
  width: 26px; height: 16px; pointer-events: none;
  background:
    linear-gradient(var(--accent),var(--accent)) 0 100%/3px 60% no-repeat,
    linear-gradient(var(--accent),var(--accent)) 6px 100%/3px 100% no-repeat,
    linear-gradient(var(--accent),var(--accent)) 12px 100%/3px 42% no-repeat,
    linear-gradient(var(--accent),var(--accent)) 18px 100%/3px 78% no-repeat,
    linear-gradient(var(--accent),var(--accent)) 24px 100%/3px 30% no-repeat;
  opacity: 0.6;
}
.hcard::after {
  content: "\25CF  STEP " counter(step, decimal-leading-zero) " / 06";
  position: absolute; left: 34px; bottom: 22px;
  font-family: "JetBrains Mono", monospace;
  font-size: 10px; letter-spacing: 0.18em;
  color: var(--accent); opacity: 0.7; pointer-events: none;
}
.hcard[data-state="active"] {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  border-color: color-mix(in srgb, var(--accent) 42%, var(--rule));
  box-shadow:
    0 4px 10px rgba(22,20,15,0.12),
    0 46px 96px rgba(22,20,15,0.42),
    0 0 0 1px color-mix(in srgb, var(--accent) 24%, transparent);
  pointer-events: auto;
}
.hcard[data-state="prev"],
.hcard[data-state="next"] {
  opacity: 0.4;
  pointer-events: none;
  box-shadow: 0 10px 24px rgba(22,20,15,0.20);
}
.hcard[data-state="prev"]::before,
.hcard[data-state="next"]::before { opacity: 0.28; }
.hcard[data-state="prev"]::after,
.hcard[data-state="next"]::after { opacity: 0.3; }
.hcard[data-state="prev"] { transform: translate(-50%, calc(-50% - 274px)) scale(0.8); }
.hcard[data-state="next"] { transform: translate(-50%, calc(-50% + 274px)) scale(0.8); }
.hcard[data-state="prev"] .hk,
.hcard[data-state="next"] .hk { color: var(--ink-faint); }
.hcard[data-state="prev"] .ht,
.hcard[data-state="next"] .ht { color: var(--ink-muted); }
/* Hide everything but label+title so a peek stays a clean one-liner regardless of card content. */
.hcard[data-state="prev"] > *:not(.hk):not(.ht),
.hcard[data-state="next"] > *:not(.hk):not(.ht) { display: none; }
.hcard[data-state="hidden"],
.hcard:not([data-state]) {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.9);
  pointer-events: none;
}
.hcard .hk {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px; letter-spacing: 0.24em; text-transform: uppercase;
  color: color-mix(in srgb, var(--accent) 80%, var(--ink));
  margin: 0; position: relative; z-index: 1;
}
.hcard .ht {
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 96; font-weight: 500;
  font-size: clamp(25px, 2.7vw, 36px); line-height: 1.08;
  letter-spacing: -0.02em; color: var(--ink); margin: 0;
  position: relative; z-index: 1;
}
.hcard .hb {
  margin: 0; font-size: 15px; line-height: 1.6; color: var(--ink-mid);
  max-width: 42ch; position: relative; z-index: 1;
}
.hcard .hb em { font-style: italic; color: var(--ink); font-weight: 500; }
.hcard .hfig {
  margin: 6px 0 26px; padding: 22px 16px;
  display: flex; align-items: center; justify-content: center;
  background: color-mix(in srgb, var(--bg) 100%, #000 12%);
  border: 1px solid color-mix(in srgb, var(--accent) 16%, var(--rule));
  border-radius: 12px;
  position: relative; z-index: 1;
}
.hcard .hfig svg { width: 100%; height: auto; max-width: 210px; max-height: 150px; }

.d-card { fill: var(--bg); stroke: var(--rule-strong); stroke-width: 1; }
.d-2 { opacity: 0.7; } .d-3 { opacity: 0.45; }
.d-line rect { fill: var(--ink-faint); opacity: 0.55; }
.d-cut { stroke: var(--accent); stroke-width: 1.3; opacity: 0.7; }
.d-arrow { stroke: var(--accent); stroke-width: 1.5; fill: none; }
.d-vec rect { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 0.7; }
.d-ell { font-family: "JetBrains Mono", monospace; font-size: 16px; fill: var(--accent); }
.d-mini rect { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 0.5; }
.d-flow { stroke: var(--accent); stroke-width: 1.3; opacity: 0.7; stroke-dasharray: 2 3; fill: none; }
.d-cyt { fill: var(--accent); stroke: var(--accent-deep); }
.d-cyb { fill: var(--accent); stroke: var(--accent-deep); stroke-width: 1; }
.d-cyl { fill: none; stroke: rgba(255,255,255,0.45); stroke-width: 1; }
.d-m { fill: var(--bg); stroke: var(--rule-strong); stroke-width: 1; opacity: 0.5; }
.d-hit { fill: var(--accent-soft); stroke: var(--accent); opacity: 1; }
.d-ans { fill: var(--panel-alt); stroke: var(--accent); stroke-width: 1; }
.d-ft { font-family: "JetBrains Mono", monospace; font-size: 9px; font-weight: 700; fill: var(--accent); }
.d-ring { fill: none; stroke: var(--rule-strong); stroke-width: 3; }
.d-ring-arc { fill: none; stroke: var(--accent); stroke-width: 3; stroke-linecap: round; }
.d-arrow-head { fill: var(--accent); }
.d-hand { stroke: var(--ink-mid); stroke-width: 3; stroke-linecap: round; }
.d-hub { fill: var(--accent); }

.setup {
  flex: 1; min-height: 0;
  width: 100%; max-width: 1180px; margin: 0 auto;
  padding: clamp(24px, 4vh, 56px) clamp(28px, 7vw, 110px);
  display: grid;
  grid-template-columns: 0.82fr 1.18fr;
  gap: clamp(40px, 6vw, 96px);
  align-items: center;
  position: relative; isolation: isolate;
}
.setup::before {
  content: ""; position: absolute; inset: 0;
  left: 50%; width: 100vw; transform: translateX(-50%); z-index: -1;
  background:
    radial-gradient(56% 62% at 78% 26%, var(--accent-soft) 0%, transparent 60%),
    radial-gradient(50% 58% at 14% 84%, var(--accent-soft) 0%, transparent 62%),
    var(--bg);
}
.setup-head { position: static; }
.setup-cta {
  display: flex; align-items: center; gap: 18px;
  margin-top: clamp(22px, 3.4vh, 36px);
}
.setup-eyebrow {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px; letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--ink-faint); margin: 0 0 18px;
}
.setup-title {
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 144; font-weight: 500;
  font-size: clamp(44px, 6vw, 92px);
  line-height: 0.94; letter-spacing: -0.03em; margin: 0; color: var(--ink);
}
.setup-title em { font-style: italic; color: var(--ink); }
.setup-lead {
  margin: 24px 0 0;
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 48; font-style: italic;
  font-size: clamp(16px, 1.5vw, 20px);
  line-height: 1.5; color: var(--ink-mid); max-width: 30ch;
}
.setup-steps { list-style: none; margin: 0; padding: 0; }
.setup-step {
  display: grid; grid-template-columns: auto 1fr;
  gap: 26px; align-items: start;
  padding: clamp(16px, 2.4vh, 28px) 0; border-top: 1px solid var(--rule);
}
.setup-step:first-child { padding-top: 0; border-top: none; }
.setup-step:last-child { padding-bottom: 0; }
.setup-fig {
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 144; font-weight: 500;
  font-size: clamp(40px, 4.6vw, 68px);
  line-height: 0.8; letter-spacing: -0.04em;
  color: var(--accent); opacity: 0.28; font-feature-settings: "tnum";
}
.setup-body { padding-top: 6px; }
.setup-body h3 {
  font-family: "Fraunces", Georgia, serif;
  font-size: clamp(20px, 2vw, 26px); font-weight: 500;
  margin: 0 0 8px; color: var(--ink);
}
.setup-body p { margin: 0; font-size: 15.5px; color: var(--ink-mid); line-height: 1.6; }
.setup-term {
  margin-top: 12px; background: var(--ink); border-radius: 10px;
  padding: 10px 16px 12px; font-family: "JetBrains Mono", monospace;
  box-shadow: 0 12px 28px rgba(22,20,15,0.20); max-width: 320px;
}
.term-dots { display: flex; gap: 6px; margin-bottom: 9px; }
.term-dots i { width: 9px; height: 9px; border-radius: 50%; background: rgba(255,255,255,0.22); display: block; }
.term-dots i:first-child { background: var(--accent); }
.term-line { display: block; background: none; border: none; padding: 0; color: var(--bg); font-size: 13.5px; }
.term-prompt { color: var(--accent); margin-right: 8px; font-weight: 700; }

.cta-band {
  position: relative; isolation: isolate;
  text-align: center;
  padding: clamp(96px, 16vh, 180px) 24px;
  display: flex; flex-direction: column; align-items: center;
}
.cta-band::before {
  content: ""; position: absolute; inset: 0;
  left: 50%; width: 100vw; transform: translateX(-50%); z-index: -1;
  border-top: 1px solid var(--rule);
  background:
    radial-gradient(60% 80% at 50% 0%, var(--accent-soft) 0%, transparent 62%),
    var(--bg);
}
.cta-eyebrow {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px; letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--ink-faint); margin: 0 0 18px;
}
.cta-h {
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 144; font-weight: 500;
  font-size: clamp(46px, 8vw, 104px);
  line-height: 0.96; letter-spacing: -0.03em;
  margin: 0; color: var(--ink);
}
.cta-h em { font-style: italic; }
.cta-sub {
  margin: 22px 0 0;
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 48; font-style: italic;
  font-size: clamp(16px, 1.6vw, 21px);
  color: var(--ink-mid); max-width: 34ch; line-height: 1.5;
}
.cta-btn {
  margin-top: 38px;
  display: inline-flex; align-items: center; gap: 11px;
  font-family: "Space Grotesk", sans-serif; font-weight: 500; font-size: 16px;
  background: var(--accent); color: var(--send-text);
  padding: 16px 32px; border-radius: 999px; text-decoration: none;
  box-shadow: 0 14px 36px rgba(204,74,37,0.32);
  transition: transform 200ms ease, box-shadow 200ms ease;
}
.cta-btn:hover { transform: translateY(-2px); box-shadow: 0 20px 46px rgba(204,74,37,0.4); }
.cta-btn svg { stroke: currentColor; }
.cta-actions { margin-top: 38px; display: flex; align-items: center; gap: 22px; flex-wrap: wrap; justify-content: center; }
.cta-actions .cta-btn { margin-top: 0; }
.cta-ghost {
  font-family: "JetBrains Mono", monospace;
  font-size: 13px; letter-spacing: 0.04em;
  color: var(--ink-mid); text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms ease, border-color 180ms ease;
}
.cta-ghost:hover { color: var(--accent); border-bottom-color: color-mix(in srgb, var(--accent) 50%, transparent); }
.gs-back { display: inline-block; margin-top: 22px; }

.site-foot {
  flex-shrink: 0;
  display: flex; align-items: center; gap: 20px;
  padding: 0 clamp(20px, 5vw, 64px);
  height: 56px;
  border-top: 1px solid var(--rule);
  background: var(--bg);
}
.site-foot-mark {
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 96; font-weight: 500;
  font-size: 19px; letter-spacing: -0.01em;
  color: var(--ink); text-decoration: none;
}
.site-foot-nav {
  display: flex; align-items: center; flex-wrap: nowrap;
  gap: 22px; flex: 1; overflow: hidden;
}
.site-foot-nav a {
  font-family: "JetBrains Mono", monospace;
  font-size: 11.5px; letter-spacing: 0.08em;
  color: var(--ink-muted); text-decoration: none;
  white-space: nowrap;
  transition: color 160ms ease;
}
.site-foot-nav a:hover { color: var(--accent); }
.site-foot-copy {
  margin: 0; margin-left: auto;
  font-family: "JetBrains Mono", monospace;
  font-size: 11px; letter-spacing: 0.05em;
  color: var(--ink-faint); white-space: nowrap;
}

/* Narrow screens scroll a vertical stack (single-screen is a desktop-only contract). Reduced-motion is deliberately NOT linearised — it keeps the single-card stage. */
@media (max-width: 900px) {
  body.how-page { height: auto; min-height: 100vh; overflow: auto; }
  .how-main { display: block; }
  .hero {
    position: static; height: auto;
    display: block; padding: 64px 24px 48px;
  }
  .hero-copy { margin-bottom: 40px; padding-left: 0; }
  .hero-hud { display: none; }
  .hero-deck { height: auto; display: flex; flex-direction: column; gap: 18px; }
  .hcard {
    position: relative; top: auto; left: auto;
    width: 100%;
    opacity: 1 !important;
    transform: none !important;
    box-shadow: 0 16px 34px rgba(22,20,15,0.16);
  }
  .hcard .hb, .hcard .hfig { display: block !important; }
  .hcard .hfig { display: flex !important; }
  .setup { grid-template-columns: 1fr; gap: 40px; padding-top: 72px; }
  .setup-head { position: static; }
  .setup-title { font-size: clamp(44px, 12vw, 72px); }
  .setup-step { gap: 18px; padding: 28px 0; }
  .setup-fig { font-size: clamp(40px, 13vw, 60px); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}