/* ==========================================================================
   Essential Watch — Frontier Moto language
   Hairline-rule system: 1px lines only, square corners only.
   Palette: ash white + onyx black, one accent #FFE101.
   Type: Instrument Sans (body/UI), Instrument Serif italic (wordmark accents),
   Handjet (watch screen + technical labels).
   ========================================================================== */

/* ---------- Tokens ---------- */

:root {
  color-scheme: light;

  --ash: #F4F3EF;
  --ash-soft: #E9E7E1;
  --ash-deep: #DBD8D0;
  --onyx: #121212;
  --onyx-soft: #1E1F21;

  --bg: var(--ash);
  --bg-soft: var(--ash-soft);
  --surface: var(--ash);
  --ink: var(--onyx);
  --ink-soft: #4A4844;
  --ink-faint: #6E6A62;
  --accent: #FFE101;
  --accent-deep: #D6C200;
  --accent-ink: #464646;
  --on-accent: #121212;
  --nav-link: rgba(18, 18, 18, 0.72);
  --selection: #FFE101;
  --line: rgba(18, 18, 18, 0.18);
  --line-strong: rgba(18, 18, 18, 0.45);
  --frost: rgba(244, 243, 239, 0.92);
  --scrim: linear-gradient(96deg, rgba(10,11,12,0.88) 0%, rgba(10,11,12,0.72) 42%, rgba(10,11,12,0.30) 100%);

  --font-sans: "Instrument Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-serif: "Instrument Serif", Georgia, serif;
  --font-pixel: "Handjet", ui-monospace, Consolas, monospace;
  --font-text: var(--font-sans);
  --font-mono: var(--font-pixel);

  --measure: 1080px;
  --wide: 1680px;
  --gutter: clamp(20px, 5vw, 48px);
  --section-pad: clamp(48px, 7vw, 88px);

  --nav-h: 66px;

  --radius-card: 0;
  --radius-pill: 0;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #121212;
    --bg-soft: #1A1B1D;
    --surface: #191B1D;
    --ink: #F4F3EF;
    --ink-soft: #B9B5AC;
    --ink-faint: #96918A;
    --nav-link: rgba(244, 243, 239, 0.72);
    --line: rgba(244, 243, 239, 0.18);
    --line-strong: rgba(244, 243, 239, 0.42);
    --frost: rgba(18, 18, 18, 0.92);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #121212;
  --bg-soft: #1A1B1D;
  --surface: #191B1D;
  --ink: #F4F3EF;
  --ink-soft: #B9B5AC;
  --ink-faint: #96918A;
  --nav-link: rgba(244, 243, 239, 0.72);
  --line: rgba(244, 243, 239, 0.18);
  --line-strong: rgba(244, 243, 239, 0.42);
  --frost: rgba(18, 18, 18, 0.92);
}

/* ---------- Hard rules: square corners, 1px lines ---------- */

*, *::before, *::after { box-sizing: border-box; border-radius: 0 !important; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; height: auto; }

h1, h2, h3, h4, p, figure, ul, ol, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }

a { color: inherit; text-decoration: none; }
p a:not(.btn):not(.btn-text):not(.btn-primary):not(.btn-outline), .md a, .card p a:not(.btn):not(.btn-text):not(.btn-primary):not(.btn-outline) { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }

::selection { background: var(--accent); color: var(--on-accent); }

:focus-visible { outline: 1px solid var(--accent); outline-offset: 2px; }
:root[data-theme="light"] :focus-visible { outline-color: var(--accent-ink); }

/* ---------- Typography ---------- */

.display {
  font-family: var(--font-sans);
  font-size: clamp(40px, 4rem + 4vw, 96px);
  line-height: 0.95;
  font-weight: 700;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}
.display em, .headline em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  text-transform: none;
  letter-spacing: -0.01em;
}

.headline {
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.05;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subhead { font-size: clamp(21px, 3vw, 28px); line-height: 1.2; font-weight: 600; }

.lede { font-size: clamp(17px, 1.8vw, 19px); line-height: 1.5; color: var(--ink-soft); }
.body-copy { font-size: 16px; line-height: 1.6; color: var(--ink-soft); }

.mono, .kicker {
  font-family: var(--font-pixel);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--ink-faint);
}
.kicker { display: block; }

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

.container { max-width: var(--measure); margin-inline: auto; padding-inline: var(--gutter); }

.section { padding-block: var(--section-pad); border-top: 1px solid var(--line); }
/* Required breathing room between every block: 40px minimum. */
main > section + section { margin-top: 40px; }
main > header.hero + section { margin-top: 40px; }
.section:first-of-type { border-top: none; }

.section-head { max-width: 720px; margin-bottom: clamp(28px, 4vw, 44px); }
.section-head .kicker { margin-bottom: 14px; color: var(--accent-ink); }
:root[data-theme="dark"] .section-head .kicker { color: var(--accent); }
.section-head .headline { margin-bottom: 18px; }

.hairline-list > * + * { border-top: 1px solid var(--line); }

/* ---------- Navbar ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: var(--nav-h);
  background: var(--frost);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  max-width: var(--wide);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 32px);
}

/* Wordmark: Instrument Serif italic. */
.nav-brand, .wordmark {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  font-size: 24px;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}
.nav-brand:hover, .wordmark:hover { text-decoration: none; opacity: 0.75; }
.nav-brand .dot { display: none; }

.nav-links { display: flex; align-items: center; gap: clamp(20px, 3vw, 36px); margin-left: auto; }
.nav-links a {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--nav-link);
  padding: 8px 2px;
  position: relative;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%; bottom: 2px;
  height: 1px;
  background: var(--accent);
  transition: right 0.25s ease;
}
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-links a:hover::after { right: 0; }
.nav-links a[aria-current="page"] { color: var(--ink); font-weight: 700; }
.nav-links a[aria-current="page"]::after { right: 0; }

.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  border: 1px solid var(--line-strong);
  background: none;
  cursor: pointer;
  align-items: center; justify-content: center;
  flex-direction: column; gap: 6px;
}
.nav-toggle span { display: block; width: 18px; height: 1px; background: var(--ink); transition: transform 0.25s ease; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(3.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { transform: translateY(-3.5px) rotate(-45deg); }

.nav-panel { display: none; }

/* ---------- Theme toggle ---------- */

.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px;
  border: 1px solid var(--line-strong);
  background: none;
  color: var(--nav-link);
  cursor: pointer;
  padding: 0;
  margin-left: 8px;
}
.theme-toggle:hover { color: var(--ink); background: var(--accent); border-color: var(--accent); }
.theme-toggle svg {
  width: 17px; height: 17px; display: block;
  fill: none; stroke: currentColor; stroke-width: 1px;
  stroke-linecap: round; stroke-linejoin: round;
}
.theme-toggle .icon-moon { display: block; }
.theme-toggle .icon-sun { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
}
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }

/* ---------- Hero: full-bleed 100vw x 100dvh ---------- */

.hero {
  position: relative;
  width: 100vw;
  margin-left: calc(50% - 50vw);
  min-height: 100dvh;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: var(--onyx);
  color: #F4F3EF;
  border-bottom: 1px solid var(--line-strong);
  padding-top: 40px;
  padding-bottom: clamp(32px, 5vw, 72px);
}

.hero-compact { min-height: 62dvh; min-height: 62svh; }

.hero-media { position: absolute; inset: 0; margin: 0; border: none; }
.hero-media img {
  width: 100vw;
  height: 100dvh;
  min-height: 100%;
  object-fit: cover;
}
.hero-compact .hero-media img { height: 100%; }
.hero::after {
  content: "";
  position: absolute; inset: 0;
  background: var(--scrim);
  pointer-events: none;
}

.hero-inner, .hero > .container, .hero .hero-copy {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--wide);
  margin-inline: auto;
  padding-inline: var(--gutter);
  text-align: left;
}

.hero .kicker { color: var(--accent); margin-bottom: 18px; display: block; }
.hero .display { margin-bottom: 22px; color: #F4F3EF; max-width: 14ch; }
.hero .lede { max-width: 46ch; margin-bottom: 32px; color: #CFCAC0; }
.hero .mono { color: var(--accent); }

/* ---------- Buttons: one standard, everywhere ----------
   Rectangular, white 1px outline, translucent black blur fill,
   label plus ">" icon. Hover fills solid black and nudges the icon. */

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }

.btn, .btn-text, .btn-primary, .btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px 20px;
  border: 1px solid var(--accent-ink);
  background: rgba(0, 0, 0, 0.45);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: #fff;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-align: center;
  text-decoration: none;
  transition: background 0.25s ease, border-color 0.25s ease;
}

.btn:hover, .btn-text:hover, .btn-primary:hover, .btn-outline:hover {
  background: #000;
  border-color: #fff;
  color: #fff;
  text-decoration: none;
}

.btn svg, .btn-text svg, .btn-primary svg, .btn-outline svg {
  width: 14px;
  height: 14px;
  flex: none;
  transition: transform 0.25s ease;
}

.btn:hover svg, .btn-text:hover svg, .btn-primary:hover svg, .btn-outline:hover svg {
  transform: translateX(4px);
}

.spectrum + .stat-band { margin-top: 40px; }

/* ---------- Bento grids: thin 1px lines, no gaps ---------- */

.stat-band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.stat {
  padding: clamp(28px, 4vw, 44px) clamp(16px, 2.5vw, 32px);
  text-align: left;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: transparent;
}
.stat .value {
  font-family: var(--font-pixel);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 500;
  color: var(--ink);
  display: block;
  margin-bottom: 8px;
}
.stat .label { font-size: 14px; color: var(--ink-soft); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.card {
  border: none;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: clamp(28px, 4vw, 40px);
  background: transparent;
}
.card:hover { background: var(--bg-soft); }
.card .kicker { margin-bottom: 14px; display: block; color: var(--accent-ink); }
:root[data-theme="dark"] .card .kicker { color: var(--accent); }
.card h3 { font-size: 21px; font-weight: 700; letter-spacing: -0.012em; margin-bottom: 12px; }
.card p { font-size: 15px; line-height: 1.55; color: var(--ink-soft); }
.card-grid.two { grid-template-columns: repeat(2, 1fr); }

/* Positioning spectrum as bento. */
.spectrum {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.spectrum-node {
  border: none;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: clamp(24px, 3.5vw, 36px);
  text-align: left;
  display: flex; flex-direction: column; gap: 10px;
}
.spectrum-node .name { font-size: 19px; font-weight: 700; }
.spectrum-node .role {
  font-family: var(--font-pixel); font-size: 12px;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-faint);
  border-bottom: 1px solid var(--line);
  padding-bottom: 10px;
}
.spectrum-node p { font-size: 14px; line-height: 1.5; color: var(--ink-soft); }
.spectrum-node.center { background: var(--accent); color: var(--on-accent); border-color: var(--onyx); }
.spectrum-node.center .role, .spectrum-node.center p { color: rgba(18,18,18,0.78); border-color: rgba(18,18,18,0.3); }

/* ---------- Status chips: square ---------- */

.chip-row { display: flex; flex-wrap: wrap; gap: 0; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.chip {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-pixel); font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-soft);
  border: none; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line);
  padding: 10px 16px;
}
.chip::before { content: ""; width: 7px; height: 7px; background: var(--line-strong); flex: none; }
.chip.done::before, .chip.active::before { background: var(--accent-deep); }
:root[data-theme="dark"] .chip.done::before, :root[data-theme="dark"] .chip.active::before { background: var(--accent); }
.chip.active::before { animation: chip-pulse 2.2s ease-in-out infinite; }
.chip.next::before { background: none; border: 1px solid var(--line-strong); }
@keyframes chip-pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }

/* ---------- Principles / hardware / journal ---------- */

.principle-row {
  display: grid; grid-template-columns: 96px 1fr;
  gap: clamp(20px, 4vw, 56px);
  padding-block: clamp(28px, 4vw, 44px);
}
.principle-row .number { font-family: var(--font-pixel); font-size: 14px; color: var(--accent-ink); padding-top: 6px; }
:root[data-theme="dark"] .principle-row .number { color: var(--accent); }
.principle-row h3 { font-size: clamp(22px, 3vw, 28px); font-weight: 700; margin-bottom: 12px; }
.principle-row p { max-width: 640px; font-size: 16px; line-height: 1.6; color: var(--ink-soft); }

.spec-block { padding-block: clamp(28px, 4vw, 44px); }
.spec-block h3 { display: flex; align-items: baseline; gap: 16px; font-size: 22px; font-weight: 700; margin-bottom: 8px; }
.spec-block h3 .index { font-family: var(--font-pixel); font-size: 13px; font-weight: 500; color: var(--accent-ink); }
:root[data-theme="dark"] .spec-block h3 .index { color: var(--accent); }
.spec-rows { margin-top: 20px; border-top: 1px solid var(--line-strong); }
.spec-row { display: grid; grid-template-columns: minmax(140px, 220px) 1fr; gap: 12px clamp(24px, 4vw, 56px); padding-block: 18px; border-bottom: 1px solid var(--line); }
.spec-row + .spec-row { border-top: none; }
.spec-row dt { font-family: var(--font-pixel); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-faint); padding-top: 2px; }
.spec-row dd { font-size: 15px; line-height: 1.55; color: var(--ink); }
.spec-row dd .note { display: block; margin-top: 4px; font-size: 13px; color: var(--ink-soft); }

.open-list { counter-reset: open-item; border-top: 1px solid var(--line-strong); }
.open-list li {
  display: grid; grid-template-columns: 44px 1fr; gap: 16px;
  padding-block: 16px; font-size: 15px; line-height: 1.55; color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
}
.open-list li::before {
  counter-increment: open-item; content: counter(open-item, decimal-leading-zero);
  font-family: var(--font-pixel); font-size: 13px; color: var(--ink-faint); padding-top: 2px;
}

.timeline { position: relative; padding-left: 28px; border-left: 1px solid var(--line-strong); }
.phase { position: relative; padding-block: clamp(20px, 3vw, 32px); }
.phase + .phase { border-top: 1px solid var(--line); }
.phase::before {
  content: ""; position: absolute; left: -33px; top: 30px;
  width: 9px; height: 9px; background: var(--bg); border: 1px solid var(--line-strong);
}
.phase.done::before { background: var(--accent); border-color: var(--accent); }
.phase.active::before { background: var(--accent); border-color: var(--onyx); }
.phase .when { font-family: var(--font-pixel); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-faint); display: block; margin-bottom: 6px; }
.phase h3 { font-size: 21px; font-weight: 700; margin-bottom: 8px; }
.phase p { max-width: 620px; font-size: 15px; color: var(--ink-soft); }

.entry { padding-block: clamp(28px, 4vw, 44px); border-top: 1px solid var(--line); }
.entry .date { font-family: var(--font-pixel); font-size: 13px; color: var(--accent-ink); display: block; margin-bottom: 10px; }
:root[data-theme="dark"] .entry .date { color: var(--accent); }
.entry h3 { font-size: clamp(21px, 3vw, 26px); font-weight: 700; margin-bottom: 12px; }
.entry p { max-width: 680px; font-size: 16px; line-height: 1.6; color: var(--ink-soft); }
.entry p + p { margin-top: 12px; }

/* ---------- Emulator ---------- */

.emulator-stage { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: center; gap: clamp(32px, 6vw, 80px); }
.device-wrap { flex: none; }

#device {
  position: relative;
  padding: 22px 26px;
  background: #1a1a1a;
  border: 1px solid #3a3a3a;
  box-shadow: none;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
#device:focus-visible { outline: 1px solid var(--accent); outline-offset: 4px; }
#device canvas {
  display: block; background: #000; image-rendering: auto;
  width: 384px; height: 192px;
  max-width: calc(100vw - 124px); height: auto; aspect-ratio: 2 / 1;
}
.device-btn {
  position: absolute; background: #2d2d2d; border: 1px solid #111;
  padding: 0; transition: filter 0.1s ease; cursor: pointer; font: inherit;
}
.device-btn::after { content: ""; position: absolute; inset: -14px; }
.device-btn.btn-upper { right: -9px; top: 38px; width: 12px; height: 34px; }
.device-btn.btn-lower { right: -9px; bottom: 38px; width: 12px; height: 34px; }
.device-btn.crown {
  right: -13px; top: 50%; transform: translateY(-50%);
  width: 18px; height: 56px;
  background: repeating-linear-gradient(0deg, #333, #333 1px, #555 1px, #555 2px);
}
.device-btn.active-btn { filter: brightness(1.6); }
.device-feedback { position: absolute; inset: 0; pointer-events: none; }
.fb-icon { position: absolute; color: var(--accent); font-family: var(--font-pixel); font-weight: 500; font-size: 13px; opacity: 0; transition: opacity 0.05s ease; }
.fb-visible { opacity: 1; }
#fb-btn-upper { right: -34px; top: 44px; }
#fb-btn-lower { right: -34px; bottom: 44px; }
#fb-rotate-up { right: -40px; top: 38%; font-size: 12px; }
#fb-rotate-down { right: -40px; bottom: 38%; font-size: 12px; }
#fb-crown-press { right: -58px; top: 48%; font-size: 11px; }

.emulator-side { flex: 1 1 300px; max-width: 420px; }
.emulator-side h3 { font-size: 21px; font-weight: 700; margin-bottom: 16px; }
.control-table { width: 100%; border-collapse: collapse; border-top: 1px solid var(--line-strong); }
.control-table th, .control-table td { text-align: left; padding: 10px 0; font-size: 14px; color: var(--ink-soft); border-bottom: 1px solid var(--line); }
.control-table th { font-family: var(--font-pixel); font-size: 11px; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-faint); }
.control-table td:first-child { color: var(--ink); }

kbd {
  font-family: var(--font-pixel); font-size: 12px; color: var(--ink);
  background: var(--surface); border: 1px solid var(--line-strong);
  padding: 3px 8px; white-space: nowrap;
}

.emulator-note {
  margin-top: 28px; padding: 20px 22px;
  border: 1px solid var(--line); border-left: 1px solid var(--accent);
  font-size: 14px; line-height: 1.55; color: var(--ink-soft);
}
.emulator-note .kicker { display: block; margin-bottom: 10px; }

/* ---------- Spec page ---------- */

.hero-compact .lede { max-width: 620px; }
.spec-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: clamp(28px, 5vw, 64px); align-items: start; }
.spec-layout.has-toc { grid-template-columns: 190px minmax(0, 1fr); }
.spec-toc { position: sticky; top: calc(var(--nav-h) + 24px); border: 1px solid var(--line); padding: 16px; }
.spec-toc h2 { font-family: var(--font-pixel); font-size: 11px; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 12px; }
.spec-toc li + li { margin-top: 2px; }
.spec-toc a { display: block; font-size: 13px; line-height: 1.4; color: var(--ink-soft); padding: 5px 0 5px 12px; border-left: 1px solid var(--line); }
.spec-toc a:hover { color: var(--ink); border-left-color: var(--accent); text-decoration: none; }

.md > h1:first-child { display: none; }
.md h2 { font-size: clamp(19px, 2.4vw, 23px); font-weight: 700; margin-top: 44px; padding-top: 20px; border-top: 1px solid var(--line-strong); }
.md h3 { font-size: 17px; font-weight: 700; margin-top: 28px; }
.md h2:first-child, .md h3:first-child { margin-top: 0; }
.md h2, .md h3, .md li[id] { scroll-margin-top: calc(var(--nav-h) + 16px); }
.md p { font-size: 15px; line-height: 1.6; color: var(--ink-soft); margin-top: 14px; }
.md ul, .md ol { margin-top: 14px; padding-left: 22px; }
.md ul { list-style: disc; } .md ol { list-style: decimal; }
.md li { font-size: 15px; line-height: 1.6; color: var(--ink-soft); margin-top: 8px; padding-left: 4px; }
.md li::marker { color: var(--ink-faint); }
.md strong { color: var(--ink); font-weight: 700; }
.md code { font-family: var(--font-pixel); font-size: 0.88em; color: var(--ink); background: var(--surface); border: 1px solid var(--line); padding: 1px 5px; }
.md hr { border: none; border-top: 1px solid var(--line); margin: 36px 0 0; }
.md li[id]:target, .md li[id].is-target { background: var(--accent); color: var(--on-accent); padding: 6px 8px; }
.md-anchor { font-family: var(--font-pixel); font-size: 0.72em; color: var(--ink-faint); opacity: 0; }
.md h2:hover .md-anchor, .md h3:hover .md-anchor, .md-anchor:focus-visible { opacity: 1; text-decoration: none; }

@media (max-width: 1068px) {
  .spec-layout, .spec-layout.has-toc { grid-template-columns: minmax(0, 1fr); }
  .spec-toc { position: static; }
  .spec-toc ul { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 0 20px; }
}

/* ---------- Footer: onyx block ---------- */

.footer {
  background: var(--onyx);
  color: #F4F3EF;
  border-top: 1px solid var(--onyx);
  padding-block: clamp(40px, 6vw, 64px) 28px;
  font-size: 12px;
}
.footer .wordmark { color: #F4F3EF; }
.footer-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; padding-bottom: 32px; border-bottom: 1px solid rgba(244,243,239,0.2); }
.footer h4 { font-family: var(--font-pixel); font-size: 11px; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); margin-bottom: 14px; }
.footer-cols li + li { margin-top: 10px; }
.footer-cols a { color: #CFCAC0; }
.footer-cols a:hover { color: #F4F3EF; }
.footer-bottom { padding-top: 20px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; color: #96918A; }
.footer-bottom .mono { font-size: 11px; color: #96918A; }

/* ---------- Reveal ---------- */

.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; will-change: opacity, transform; }
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */

@media (max-width: 1068px) {
  .card-grid { grid-template-columns: 1fr 1fr; }
  .card-grid > .card:first-child { grid-column: 1 / -1; border-bottom: 1px solid var(--line); }
}

@media (max-width: 900px) {
  .spectrum { grid-template-columns: 1fr; }
  .spectrum-node.center { order: -1; }
  .spec-row { grid-template-columns: 1fr; gap: 6px; }
  .principle-row { grid-template-columns: 1fr; gap: 8px; }
}

@media (max-width: 734px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .theme-toggle { margin-left: auto; }
  .nav-panel {
    display: block; position: absolute; top: var(--nav-h); left: 0; right: 0;
    background: var(--surface); border-bottom: 1px solid var(--line-strong);
    padding: 8px var(--gutter) 20px;
  }
  .nav-panel[hidden] { display: none; }
  .nav-panel a {
    display: block; padding: 12px 0;
    font-family: var(--font-sans); letter-spacing: 0.1em; text-transform: uppercase; font-size: 13px;
    color: var(--ink); border-bottom: 1px solid var(--line);
  }
  .nav-panel a[aria-current="page"] { color: var(--ink); background: var(--accent); padding-left: 12px; }
  .stat-band { grid-template-columns: 1fr 1fr; }
  .card-grid, .card-grid.two { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: 1fr; }
  .emulator-stage { flex-direction: column; align-items: center; }
  .emulator-side { max-width: 100%; width: 100%; }
  #fb-btn-upper, #fb-btn-lower, #fb-rotate-up, #fb-rotate-down, #fb-crown-press { display: none; }
  .hero { min-height: 100svh; }
  .display { font-size: clamp(44px, 14vw, 64px); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .js .reveal { opacity: 1; transform: none; transition: none; }
  .chip.active::before { animation: none; }
}