/*
  Shortcut Press — site stylesheet

  Type pairing (Google Fonts):
    Bricolage Grotesque — display headings, set large and tightly tracked
    Geist               — body text
    Geist Mono          — keyboard shortcuts, labels and metadata

  System: dark by default, light mode via [data-theme] or prefers-color-scheme.
  One accent (electric lime) for focus, active states, key highlights and the buy button.
  Spacing on a 4px scale; radii 4 / 8 / 12 / 16; only transform and opacity animate.
*/

/* ================= Tokens ================= */

:root {
  /* spacing (4px scale) */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 20px;
  --s-6: 24px;
  --s-8: 32px;
  --s-10: 40px;
  --s-12: 48px;
  --s-16: 64px;
  --s-20: 80px;
  --s-24: 96px;
  --s-32: 128px;

  /* radii */
  --r-1: 4px;
  --r-2: 8px;
  --r-3: 12px;
  --r-4: 16px;

  /* type scale */
  --t-12: 0.75rem;
  --t-13: 0.8125rem;
  --t-14: 0.875rem;
  --t-16: 1rem;
  --t-18: 1.125rem;
  --t-20: 1.25rem;
  --t-24: 1.5rem;
  --t-32: 2rem;
  --t-display-s: clamp(1.75rem, 1.2rem + 2.2vw, 2.5rem);
  --t-display-m: clamp(2.25rem, 1.3rem + 3.8vw, 3.75rem);
  --t-display-l: clamp(2.75rem, 1.1rem + 6.2vw, 6rem);

  --font-display: "Bricolage Grotesque", "Geist", system-ui, sans-serif;
  --font-body: "Geist", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --maxw: 1240px;
  --gutter: clamp(16px, 4vw, 40px);
  --header-h: 60px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --ease-snap: cubic-bezier(0.3, 1.5, 0.5, 1);

  /* dark theme (default) */
  --bg: #08090b;
  --bg-glass: rgba(8, 9, 11, 0.82);
  --dot: rgba(255, 255, 255, 0.075);
  --panel: #0f1114;
  --panel-2: #14171b;
  --panel-3: #1b1f24;
  --line: #22262c;
  --line-strong: #30353c;
  --text: #ededef;
  --muted: #a0a5ad;
  --faint: #5f656d;
  --accent: #c8ff3d;
  --accent-ink: #0a0b0c;
  --accent-text: #c8ff3d;
  --accent-edge: #c8ff3d;
  --accent-soft: rgba(200, 255, 61, 0.14);
  --accent-glow: rgba(200, 255, 61, 0.28);
  --focus: #c8ff3d;
  --spot: rgba(255, 255, 255, 0.07);
  --paper: #15181c;
  --key-top: #262a31;
  --key-top-2: #1c1f24;
  --key-dish: rgba(255, 255, 255, 0.025);
  --key-side: #050607;
  --key-hi: rgba(255, 255, 255, 0.1);
  --key-lo: rgba(0, 0, 0, 0.45);
  --key-edge: rgba(255, 255, 255, 0.06);
  --key-text: #d6d9dd;
  --key-shadow: rgba(0, 0, 0, 0.7);
  --shadow-lg: 0 24px 60px -20px rgba(0, 0, 0, 0.75), 0 2px 8px rgba(0, 0, 0, 0.4);

  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #f4f4f1;
  --bg-glass: rgba(244, 244, 241, 0.85);
  --dot: rgba(0, 0, 0, 0.09);
  --panel: #ffffff;
  --panel-2: #fafaf8;
  --panel-3: #efefeb;
  --line: #e0e0da;
  --line-strong: #cbcbc4;
  --text: #0f1012;
  --muted: #55595f;
  --faint: #9a9ea4;
  --accent: #c8ff3d;
  --accent-ink: #0a0b0c;
  --accent-text: #3d6600;
  --accent-edge: #8cbf12;
  --accent-soft: rgba(110, 170, 0, 0.14);
  --accent-glow: rgba(140, 200, 0, 0.3);
  --focus: #3d6600;
  --spot: rgba(0, 0, 0, 0.045);
  --paper: #ffffff;
  --key-top: #ffffff;
  --key-top-2: #ebebe6;
  --key-dish: rgba(0, 0, 0, 0.025);
  --key-side: #b9b9b1;
  --key-hi: rgba(255, 255, 255, 0.9);
  --key-lo: rgba(0, 0, 0, 0.12);
  --key-edge: rgba(0, 0, 0, 0.08);
  --key-text: #24262a;
  --key-shadow: rgba(40, 40, 30, 0.28);
  --shadow-lg: 0 24px 60px -24px rgba(30, 30, 20, 0.28), 0 2px 8px rgba(30, 30, 20, 0.06);
  color-scheme: light;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f4f4f1;
    --bg-glass: rgba(244, 244, 241, 0.85);
    --dot: rgba(0, 0, 0, 0.09);
    --panel: #ffffff;
    --panel-2: #fafaf8;
    --panel-3: #efefeb;
    --line: #e0e0da;
    --line-strong: #cbcbc4;
    --text: #0f1012;
    --muted: #55595f;
    --faint: #9a9ea4;
    --accent: #c8ff3d;
    --accent-ink: #0a0b0c;
    --accent-text: #3d6600;
    --accent-edge: #8cbf12;
    --accent-soft: rgba(110, 170, 0, 0.14);
    --accent-glow: rgba(140, 200, 0, 0.3);
    --focus: #3d6600;
    --spot: rgba(0, 0, 0, 0.045);
    --paper: #ffffff;
    --key-top: #ffffff;
    --key-top-2: #ebebe6;
    --key-dish: rgba(0, 0, 0, 0.025);
    --key-side: #b9b9b1;
    --key-hi: rgba(255, 255, 255, 0.9);
    --key-lo: rgba(0, 0, 0, 0.12);
    --key-edge: rgba(0, 0, 0, 0.08);
    --key-text: #24262a;
    --key-shadow: rgba(40, 40, 30, 0.28);
    --shadow-lg: 0 24px 60px -24px rgba(30, 30, 20, 0.28), 0 2px 8px rgba(30, 30, 20, 0.06);
    color-scheme: light;
  }
}

/* ================= Base ================= */

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

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

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--t-16);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-wrap: break-word;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: radial-gradient(var(--dot) 1px, transparent 1.4px);
  background-size: 24px 24px;
  background-position: -12px -12px;
}

main {
  display: block;
  flex: 1 0 auto;
}

img,
svg {
  display: block;
  max-width: 100%;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 var(--s-4);
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

h1 {
  font-size: var(--t-display-m);
  letter-spacing: -0.045em;
  line-height: 0.98;
}

h2 {
  font-size: var(--t-display-s);
  letter-spacing: -0.04em;
}

h3 {
  font-size: var(--t-20);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

p,
ul,
ol,
dl,
table {
  margin: 0 0 var(--s-4);
}

a {
  color: inherit;
  text-decoration-line: underline;
  text-decoration-color: var(--line-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

@media (hover: hover) {
  a:hover {
    text-decoration-color: var(--accent-text);
  }
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: var(--r-1);
}

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

strong {
  font-weight: 600;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.7em;
  height: 1.7em;
  padding: 0 0.45em;
  margin: 0 0.05em;
  font-family: var(--font-mono);
  font-size: 0.78em;
  font-weight: 500;
  line-height: 1;
  vertical-align: 0.08em;
  color: var(--text);
  background: linear-gradient(180deg, var(--key-top), var(--key-top-2));
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: var(--r-1);
  box-shadow: inset 0 1px 0 var(--key-hi);
  white-space: nowrap;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

html:not(.js) .js-only {
  display: none !important;
}

.skip-link {
  position: absolute;
  left: var(--s-4);
  top: -80px;
  z-index: 100;
  padding: var(--s-2) var(--s-4);
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: var(--r-2);
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  top: var(--s-3);
}

.container {
  width: 100%;
  max-width: calc(var(--maxw) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

[id] {
  scroll-margin-top: calc(var(--header-h) + var(--s-6));
}

.label {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-2);
  margin: 0 0 var(--s-4);
  font-family: var(--font-mono);
  font-size: var(--t-12);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.label-num {
  color: var(--accent-text);
}

.label-sep {
  color: var(--faint);
}

.display {
  font-family: var(--font-display);
}

.lead {
  max-width: 60ch;
  font-size: var(--t-18);
  line-height: 1.6;
  color: var(--muted);
}

.muted {
  color: var(--muted);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-4);
}

/* ================= Buttons ================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  min-height: 44px;
  padding: var(--s-2) var(--s-5);
  font: inherit;
  font-size: var(--t-14);
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  border-radius: var(--r-2);
  border: 1px solid var(--line-strong);
  background: var(--panel-2);
  color: var(--text);
  cursor: pointer;
  transition: transform 0.15s var(--ease);
}

.btn:active {
  transform: translateY(1px);
}

@media (hover: hover) {
  .btn-ghost:hover {
    border-color: var(--muted);
  }
}

.btn-buy {
  width: 100%;
  min-height: 48px;
  font-size: var(--t-16);
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent-edge);
  box-shadow: 0 0 0 0 var(--accent-glow), inset 0 -2px 0 rgba(0, 0, 0, 0.18);
}

@media (hover: hover) {
  .btn-buy:hover {
    transform: translateY(-1px);
  }
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: var(--r-2);
  cursor: pointer;
}

@media (hover: hover) {
  .icon-btn:hover {
    color: var(--text);
    border-color: var(--line-strong);
  }
}

.icon-btn svg {
  width: 16px;
  height: 16px;
}

/* ================= Header ================= */

.site-header {
  position: relative;
  z-index: 50;
  background: var(--bg-glass);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--line);
  view-transition-name: site-header;
}

@media (min-width: 760px) {
  .site-header {
    position: sticky;
    top: 0;
  }
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-2) var(--s-6);
  min-height: var(--header-h);
  padding-block: var(--s-2);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--s-3);
  margin-right: auto;
  font-family: var(--font-display);
  font-size: var(--t-18);
  font-weight: 700;
  letter-spacing: -0.03em;
  text-decoration: none;
  color: var(--text);
}

.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--key-text);
  background: linear-gradient(180deg, var(--key-top), var(--key-top-2));
  border-radius: 7px;
  box-shadow:
    inset 0 1px 0 var(--key-hi),
    inset 0 -2px 0 var(--key-lo),
    0 0 0 1px var(--key-edge),
    0 3px 0 var(--key-side);
}

.brand-mark::after {
  content: "";
  position: absolute;
  left: 9px;
  right: 9px;
  bottom: 6px;
  height: 2px;
  border-radius: 1px;
  background: var(--accent);
}

.nav {
  order: 3;
  width: 100%;
}

.nav ul {
  display: flex;
  gap: var(--s-5);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav a {
  position: relative;
  display: inline-block;
  padding: var(--s-2) 0;
  font-size: var(--t-14);
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
}

.nav a[aria-current="page"] {
  color: var(--text);
}

.nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 2px;
  border-radius: 1px;
  background: var(--accent-text);
}

@media (hover: hover) {
  .nav a:hover {
    color: var(--text);
  }
}

@media (min-width: 760px) {
  .nav {
    order: 0;
    width: auto;
  }

  .nav ul {
    gap: var(--s-6);
  }
}

.header-tools {
  display: flex;
  align-items: center;
  gap: var(--s-2);
}

.search-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  height: 36px;
  padding: 0 var(--s-2) 0 var(--s-3);
  font: inherit;
  font-size: var(--t-13);
  color: var(--muted);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-2);
  cursor: pointer;
}

.search-btn svg {
  width: 14px;
  height: 14px;
}

.search-btn kbd {
  font-size: 11px;
  height: 20px;
}

@media (hover: hover) {
  .search-btn:hover {
    color: var(--text);
    border-color: var(--line-strong);
  }
}

@media (max-width: 420px) {
  .search-btn .search-btn-label,
  .search-btn kbd {
    display: none;
  }

  .search-btn {
    width: 36px;
    padding: 0;
    justify-content: center;
  }
}

.theme-btn .i-sun {
  display: block;
}

.theme-btn .i-moon {
  display: none;
}

:root[data-theme="light"] .theme-btn .i-sun {
  display: none;
}

:root[data-theme="light"] .theme-btn .i-moon {
  display: block;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .theme-btn .i-sun {
    display: none;
  }

  :root:not([data-theme="dark"]) .theme-btn .i-moon {
    display: block;
  }
}

/* ================= Hero ================= */

.hero {
  padding-block: var(--s-16) var(--s-20);
}

@media (min-width: 1040px) {
  .hero {
    padding-block: var(--s-24) var(--s-32);
  }
}

.hero-grid {
  display: grid;
  gap: var(--s-16);
  align-items: center;
}

@media (min-width: 1040px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: var(--s-12);
  }
}

.hero-title {
  font-size: var(--t-display-l);
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 0.92;
  margin-bottom: var(--s-8);
}

.hero-title .line {
  display: block;
  overflow: hidden;
  padding-bottom: 0.06em;
  margin-bottom: -0.06em;
}

.hero-title .line > span {
  display: block;
}

.hero-title .line:last-child > span {
  color: var(--muted);
}

@media (prefers-reduced-motion: no-preference) {
  .hero-title .line > span {
    animation: line-in 0.9s var(--ease) both;
  }

  .hero-title .line:nth-child(2) > span {
    animation-delay: 0.09s;
  }

  .hero-title .line:nth-child(3) > span {
    animation-delay: 0.18s;
  }

  .hero-copy .lead,
  .hero-actions,
  .hero-facts {
    animation: fade-in 0.8s 0.35s var(--ease) both;
  }
}

@keyframes line-in {
  from {
    transform: translateY(105%);
  }

  to {
    transform: translateY(0);
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-3) var(--s-5);
  margin: var(--s-8) 0 0;
}

.hint {
  margin: 0;
  font-size: var(--t-14);
  color: var(--muted);
}

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
  margin: var(--s-10) 0 0;
  padding: 0;
  list-style: none;
}

.hero-facts li {
  padding: var(--s-1) var(--s-3);
  font-family: var(--font-mono);
  font-size: var(--t-12);
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
}

/* ================= Keycaps ================= */

.key {
  --w: 1;
  position: relative;
  flex: none;
  width: calc(var(--ku) * var(--w) + var(--kg) * (var(--w) - 1));
  height: var(--ku);
}

.key::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: var(--kd);
  bottom: calc(var(--kd) * -1);
  border-radius: var(--kr);
  background: var(--key-side);
  box-shadow:
    0 calc(var(--kd) * 2.4) calc(var(--kd) * 4) calc(var(--kd) * -1.4) var(--key-shadow),
    0 calc(var(--kd) * 0.8) calc(var(--kd) * 1.4) 0 var(--key-shadow);
}

.key-cap {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-start;
  padding: calc(var(--ku) * 0.14) calc(var(--ku) * 0.18);
  border-radius: var(--kr);
  background: linear-gradient(180deg, var(--key-top) 0%, var(--key-top-2) 100%);
  box-shadow:
    inset 0 1px 0 var(--key-hi),
    inset 0 -3px 0 var(--key-lo),
    0 0 0 1px var(--key-edge);
  transform: translateY(0);
  transition: transform 0.09s ease-out;
}

.key-cap::before {
  content: "";
  position: absolute;
  inset: 12% 10% 22%;
  border-radius: calc(var(--kr) * 0.8);
  background: var(--key-dish);
  box-shadow: inset 0 1px 2px var(--key-lo);
}

.key-cap::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--kr);
  border: 1.5px solid var(--accent);
  box-shadow:
    0 0 0 3px var(--accent-glow),
    inset 0 0 calc(var(--ku) * 0.4) var(--accent-glow);
  opacity: 0;
  transition: opacity 0.12s ease-out;
}

.key-label {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: calc(var(--ku) * 0.24);
  font-weight: 500;
  line-height: 1;
  color: var(--key-text);
}

.key.is-down .key-cap {
  transform: translateY(calc(var(--kd) * 0.85));
}

.key.is-down .key-cap::after {
  opacity: 1;
}

.kb-panel {
  position: relative;
  padding: var(--s-4);
  border: 1px solid var(--line);
  border-radius: var(--r-4);
  background: var(--panel);
}

.kb-panel::before {
  content: "";
  position: absolute;
  inset: var(--s-2);
  border: 1px dashed var(--line);
  border-radius: var(--r-3);
  pointer-events: none;
}

.kb-stage {
  position: relative;
  display: grid;
  place-items: center;
  padding: var(--s-12) var(--s-2) var(--s-16);
  perspective: 1100px;
  overflow: hidden;
}

.kb {
  --ku: clamp(34px, 9vw, 58px);
  --kg: clamp(5px, 1.2vw, 8px);
  --kd: clamp(4px, 0.9vw, 7px);
  --kr: clamp(6px, 1.3vw, 10px);
  display: grid;
  gap: var(--kg);
  transform: rotateX(32deg) rotateZ(-7deg);
  transform-style: preserve-3d;
}

.kb-row {
  display: flex;
  gap: var(--kg);
}

.kb-caption {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--s-2) var(--s-4);
  margin: 0;
  padding: var(--s-3) var(--s-3) var(--s-2);
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--t-12);
  color: var(--muted);
}

.kb-now {
  display: inline-flex;
  align-items: center;
  gap: var(--s-1);
  min-height: 24px;
  color: var(--text);
}

.kb-now kbd {
  font-size: 11px;
}

.kb-now .kb-action {
  margin-left: var(--s-2);
  color: var(--muted);
}

/* ================= Sections ================= */

.section {
  padding-block: var(--s-20);
  border-top: 1px solid var(--line);
}

@media (min-width: 1040px) {
  .section {
    padding-block: var(--s-24);
  }
}

.sec-head {
  display: grid;
  gap: var(--s-4) var(--s-12);
  margin-bottom: var(--s-12);
}

@media (min-width: 900px) {
  .sec-head {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: end;
  }
}

.sec-head h2 {
  margin: 0;
  font-size: var(--t-display-m);
  font-weight: 650;
}

.sec-head > p,
.sec-head-text p {
  margin: 0;
  max-width: 48ch;
  color: var(--muted);
}

/* ================= Bento grid ================= */

.bento {
  display: grid;
  gap: var(--s-3);
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 720px) {
  .bento {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-areas:
      "lib lib"
      "sh pv"
      "bl bl"
      "rs rs"
      "fg dc"
      "in in";
  }

  .tile[data-area="lib"] { grid-area: lib; }
  .tile[data-area="sh"] { grid-area: sh; }
  .tile[data-area="pv"] { grid-area: pv; }
  .tile[data-area="bl"] { grid-area: bl; }
  .tile[data-area="rs"] { grid-area: rs; }
  .tile[data-area="fg"] { grid-area: fg; }
  .tile[data-area="dc"] { grid-area: dc; }
  .tile[data-area="in"] { grid-area: in; }
}

@media (min-width: 1080px) {
  .bento {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-rows: minmax(280px, auto);
    grid-template-areas:
      "lib lib sh pv"
      "lib lib bl bl"
      "rs rs fg dc"
      "in in fg dc";
  }
}

.tile {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-4);
}

.tile:focus-within {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.tile-link:focus-visible {
  outline: none;
}

.tile-art {
  position: relative;
  z-index: 1;
  flex: 1 1 auto;
  display: grid;
  place-items: center;
  min-height: 168px;
  padding: var(--s-5);
  border-bottom: 1px solid var(--line);
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 24px 24px;
  background-position: -1px -1px;
}

.tile-art::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--panel);
  opacity: 0.72;
  z-index: -1;
}

.tile-art > * {
  position: relative;
}

.tile-art svg {
  width: 100%;
  max-width: 300px;
  height: auto;
}

.tile-body {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  padding: var(--s-5) var(--s-6) var(--s-6);
}

.tile-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-1) var(--s-3);
  margin-bottom: var(--s-3);
  font-family: var(--font-mono);
  font-size: var(--t-12);
  color: var(--muted);
}

.tile-meta span + span::before {
  content: "\00b7";
  margin-right: var(--s-3);
  color: var(--faint);
}

.tile-title {
  margin-bottom: var(--s-2);
  font-size: var(--t-24);
  font-weight: 650;
  letter-spacing: -0.035em;
}

.tile-link {
  color: var(--text);
  text-decoration: none;
}

.tile-link::after {
  content: "";
  position: absolute;
  inset: -2000px;
  z-index: 2;
}

.tile-desc {
  margin-bottom: var(--s-5);
  font-size: var(--t-14);
  color: var(--muted);
}

.tile-foot {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s-3);
  margin: auto 0 0;
  padding-top: var(--s-4);
  border-top: 1px solid var(--line);
}

.price {
  font-family: var(--font-mono);
  font-size: var(--t-18);
  font-weight: 500;
  letter-spacing: -0.02em;
}

.tile-go {
  font-family: var(--font-mono);
  font-size: var(--t-12);
  color: var(--muted);
}

.tile[data-area="lib"] .tile-title {
  font-size: var(--t-display-s);
}

.tile[data-area="lib"] .tile-art {
  min-height: 300px;
}

.tile[data-area="lib"] .tile-desc {
  font-size: var(--t-16);
  max-width: 52ch;
}

/* spotlight */

.tile-glow,
.tile-edge {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.35s var(--ease);
  overflow: hidden;
}

.tile-glow {
  z-index: 0;
}

.tile-edge {
  z-index: 3;
  padding: 1px;
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box exclude, linear-gradient(#000 0 0);
}

.glow-dot {
  position: absolute;
  left: 0;
  top: 0;
  width: 520px;
  height: 520px;
  margin: -260px 0 0 -260px;
  border-radius: 50%;
  background: radial-gradient(circle closest-side, var(--spot), transparent);
  transform: translate(-999px, -999px);
  will-change: transform;
}

.tile-edge .glow-dot {
  width: 300px;
  height: 300px;
  margin: -150px 0 0 -150px;
  background: radial-gradient(circle closest-side, var(--accent), transparent);
}

@media (hover: hover) {
  .tile:hover .tile-glow,
  .tile:hover .tile-edge {
    opacity: 1;
  }

  .tile:hover .tile-go {
    color: var(--accent-text);
  }
}

/* entrance (bento only) */

.bento-ready .tile {
  opacity: 0;
  transform: translateY(28px) scale(0.985);
  transition:
    opacity 0.7s var(--ease),
    transform 0.8s var(--ease);
  transition-delay: calc(var(--i, 0) * 70ms);
}

.bento-ready .tile.is-in {
  opacity: 1;
  transform: none;
}

/* paused when off screen */
.js .tile:not(.is-playing) *,
.js .tile:not(.is-playing) *::before,
.js .tile:not(.is-playing) *::after {
  animation-play-state: paused !important;
}

/* ---------- Illustration palette ---------- */

.i-cell { fill: none; stroke: var(--line-strong); stroke-width: 1; }
.i-fill { fill: var(--panel-3); }
.i-ink { fill: var(--muted); }
.i-faint { fill: var(--line-strong); }
.i-acc { fill: var(--accent); }
.i-stroke { fill: none; stroke: var(--muted); stroke-width: 1.5; }
.i-stroke-faint { fill: none; stroke: var(--line-strong); stroke-width: 1; }
.i-astroke { fill: none; stroke: var(--accent); stroke-width: 1.5; }
.i-paper { fill: var(--paper); stroke: var(--line-strong); stroke-width: 1; }

/* spreadsheets: cells filling across a grid */
.art-sheets .cf {
  opacity: 0;
}

.art-sheets .cf.on {
  opacity: 1;
}

.art-sheets .cf-fill {
  fill: var(--line-strong);
}

@media (prefers-reduced-motion: no-preference) {
  .art-sheets .cf {
    animation: cell-fill 7.2s linear infinite both;
    animation-delay: calc(var(--d) * 90ms);
  }
}

@keyframes cell-fill {
  0% { opacity: 0; }
  5% { opacity: 1; }
  52% { opacity: 1; }
  58% { opacity: 0; }
  100% { opacity: 0; }
}

/* data analysis: bars assembling */
.art-pivot .bar {
  transform-box: fill-box;
  transform-origin: 50% 100%;
}

@media (prefers-reduced-motion: no-preference) {
  .art-pivot .bar {
    animation: bar-build 6.4s var(--ease) infinite both;
    animation-delay: calc(var(--d) * 110ms);
  }
}

@keyframes bar-build {
  0% { transform: scaleY(0); opacity: 1; }
  16% { transform: scaleY(1); opacity: 1; }
  76% { transform: scaleY(1); opacity: 1; }
  88% { transform: scaleY(1); opacity: 0; }
  100% { transform: scaleY(0); opacity: 0; }
}

/* 3D: rotating wireframe cube (CSS 3D) */
.art-cube {
  display: grid;
  place-items: center;
  gap: var(--s-4);
}

.cube-scene {
  --size: 92px;
  width: var(--size);
  height: var(--size);
  perspective: 520px;
  margin-block: var(--s-4) var(--s-2);
}

.cube {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transform: rotateX(-24deg) rotateY(38deg);
}

@media (prefers-reduced-motion: no-preference) {
  .cube {
    animation: cube-spin 18s linear infinite;
  }
}

@keyframes cube-spin {
  from { transform: rotateX(-24deg) rotateY(0deg); }
  to { transform: rotateX(-24deg) rotateY(360deg); }
}

.cube .face {
  position: absolute;
  inset: 0;
  border: 1.5px solid var(--muted);
  background: transparent;
}

.cube .f-front { transform: translateZ(calc(var(--size) / 2)); }
.cube .f-back { transform: rotateY(180deg) translateZ(calc(var(--size) / 2)); }
.cube .f-right { transform: rotateY(90deg) translateZ(calc(var(--size) / 2)); }
.cube .f-left { transform: rotateY(-90deg) translateZ(calc(var(--size) / 2)); }
.cube .f-top { transform: rotateX(90deg) translateZ(calc(var(--size) / 2)); border-color: var(--accent); background: var(--accent-soft); }
.cube .f-bottom { transform: rotateX(-90deg) translateZ(calc(var(--size) / 2)); border-style: dashed; border-color: var(--line-strong); }

.cube-floor {
  width: 180px;
  height: auto;
}

/* video: playhead scrubbing over clip blocks */
.art-video .playhead {
  transform: translateX(86px);
}

@media (prefers-reduced-motion: no-preference) {
  .art-video .playhead {
    animation: scrub 7s ease-in-out infinite alternate;
  }

  .art-video .clip-hi {
    animation: clip-hi 7s ease-in-out infinite alternate;
  }
}

@keyframes scrub {
  from { transform: translateX(0); }
  to { transform: translateX(196px); }
}

.art-video .clip-hi {
  opacity: 1;
}

@keyframes clip-hi {
  0%, 30% { opacity: 0; }
  38%, 62% { opacity: 1; }
  70%, 100% { opacity: 0; }
}

/* interface design: frames snapping into auto layout */
.art-frames .fb {
  transform-box: fill-box;
  transform-origin: center;
}

.art-frames .fm {
  opacity: 1;
}

@media (prefers-reduced-motion: no-preference) {
  .art-frames .fb {
    animation: snap 6.6s infinite both;
    animation-delay: calc(var(--d) * 120ms);
  }

  .art-frames .fm {
    animation: marks 6.6s infinite both;
  }
}

@keyframes snap {
  0%, 8% {
    transform: translate(var(--x), var(--y)) rotate(var(--r));
    opacity: 0.45;
    animation-timing-function: var(--ease-snap);
  }
  24%, 78% {
    transform: translate(0, 0) rotate(0deg);
    opacity: 1;
    animation-timing-function: var(--ease);
  }
  92%, 100% {
    transform: translate(var(--x), var(--y)) rotate(var(--r));
    opacity: 0.45;
  }
}

@keyframes marks {
  0%, 28% { opacity: 0; }
  34%, 74% { opacity: 1; }
  80%, 100% { opacity: 0; }
}

/* vector: bezier handles adjusting a curve */
.art-vector .vh {
  transform-box: view-box;
}

.art-vector .vh-1 {
  transform-origin: 30px 112px;
}

.art-vector .vh-2 {
  transform-origin: 210px 42px;
}

.art-vector .vc-b,
.art-vector .vc-c {
  opacity: 0;
}

@media (prefers-reduced-motion: no-preference) {
  .art-vector .vh-1 { animation: vh1 9s var(--ease) infinite; }
  .art-vector .vh-2 { animation: vh2 9s var(--ease) infinite; }
  .art-vector .vc-a { animation: vca 9s var(--ease) infinite; }
  .art-vector .vc-b { animation: vcb 9s var(--ease) infinite; }
  .art-vector .vc-c { animation: vcc 9s var(--ease) infinite; }
}

@keyframes vh1 {
  0%, 26% { transform: rotate(0deg); }
  33%, 59% { transform: rotate(-20deg); }
  66%, 92% { transform: rotate(20deg); }
  100% { transform: rotate(0deg); }
}

@keyframes vh2 {
  0%, 26% { transform: rotate(0deg); }
  33%, 59% { transform: rotate(20deg); }
  66%, 92% { transform: rotate(-20deg); }
  100% { transform: rotate(0deg); }
}

@keyframes vca {
  0%, 26% { opacity: 1; }
  33%, 92% { opacity: 0; }
  100% { opacity: 1; }
}

@keyframes vcb {
  0%, 26% { opacity: 0; }
  33%, 59% { opacity: 1; }
  66%, 100% { opacity: 0; }
}

@keyframes vcc {
  0%, 59% { opacity: 0; }
  66%, 92% { opacity: 1; }
  100% { opacity: 0; }
}

/* documents: paragraphs reflowing into a page */
.art-docs .dl {
  transform-box: fill-box;
  transform-origin: left center;
}

@media (prefers-reduced-motion: no-preference) {
  .art-docs .dl {
    animation: reflow 7s infinite both;
    animation-delay: calc(var(--d) * 70ms);
  }
}

@keyframes reflow {
  0%, 6% {
    transform: translate(var(--x), var(--y)) scaleX(var(--s));
    opacity: 0.5;
    animation-timing-function: var(--ease);
  }
  26%, 80% {
    transform: translate(0, 0) scaleX(1);
    opacity: 1;
    animation-timing-function: var(--ease);
  }
  94%, 100% {
    transform: translate(var(--x), var(--y)) scaleX(var(--s));
    opacity: 0.5;
  }
}

/* library: a cluster of keys pressing in turn */
.art-lib .kb-mini {
  --ku: clamp(44px, 6.4vw, 88px);
  --kg: clamp(8px, 1vw, 14px);
  --kd: 7px;
  --kr: 12px;
  display: grid;
  gap: var(--kg);
  justify-items: center;
  transform: rotateX(28deg) rotateZ(-5deg);
}

.art-lib {
  perspective: 900px;
}

.art-lib .kb-row {
  justify-content: center;
}

.art-lib .key-label {
  font-size: calc(var(--ku) * 0.22);
}

@media (prefers-reduced-motion: no-preference) {
  .art-lib .key-cap {
    animation: lib-press 7s var(--ease) infinite;
    animation-delay: calc(var(--d) * 1s);
  }

  .art-lib .key-cap::after {
    animation: lib-glow 7s var(--ease) infinite;
    animation-delay: calc(var(--d) * 1s);
  }
}

@keyframes lib-press {
  0%, 2% { transform: translateY(0); }
  5%, 11% { transform: translateY(5px); }
  15%, 100% { transform: translateY(0); }
}

@keyframes lib-glow {
  0%, 2% { opacity: 0; }
  5%, 11% { opacity: 1; }
  16%, 100% { opacity: 0; }
}

/* ================= Home: tree, timeline, spec ================= */

.split-2 {
  display: grid;
  gap: var(--s-10);
}

@media (min-width: 900px) {
  .split-2 {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: var(--s-16);
    align-items: start;
  }
}

.split-2 .sec-head {
  grid-template-columns: 1fr;
  margin-bottom: 0;
}

.tree-panel {
  padding: var(--s-6);
  font-family: var(--font-mono);
  font-size: var(--t-14);
}

.tree-title {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  margin: 0 0 var(--s-3);
  font-weight: 500;
  color: var(--text);
}

.tree-title::before {
  content: "";
  width: 10px;
  height: 12px;
  border: 1.5px solid var(--accent-text);
  border-radius: 2px;
}

.tree,
.tree ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.tree ul {
  margin-left: var(--s-6);
}

.tree li {
  position: relative;
  padding: var(--s-2) 0 var(--s-2) var(--s-6);
}

.tree li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  border-left: 1px solid var(--line-strong);
}

.tree li:last-child::before {
  bottom: auto;
  height: 20px;
}

.tree li::after {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 16px;
  border-top: 1px solid var(--line-strong);
}

.tree-name {
  color: var(--text);
  font-weight: 500;
}

.tree-desc {
  display: block;
  margin-top: 2px;
  font-family: var(--font-body);
  font-size: var(--t-14);
  color: var(--muted);
}

.tree-note {
  margin: var(--s-4) 0 0;
  padding-top: var(--s-4);
  border-top: 1px dashed var(--line);
  font-family: var(--font-body);
  color: var(--muted);
}

.timeline {
  position: relative;
  display: grid;
  gap: var(--s-8);
  margin: 0;
  padding: 0;
  list-style: none;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  border-left: 1px solid var(--line-strong);
}

.tl-item {
  position: relative;
  padding-left: var(--s-12);
}

.tl-step {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  font-family: var(--font-mono);
  font-size: var(--t-12);
  background: var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-2);
}

.tl-item h3 {
  margin-bottom: var(--s-2);
}

.tl-item p {
  margin: 0;
  color: var(--muted);
  font-size: var(--t-14);
}

@media (min-width: 900px) {
  .timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--s-6);
  }

  .timeline::before {
    left: 16px;
    right: 16px;
    top: 16px;
    bottom: auto;
    border-left: 0;
    border-top: 1px solid var(--line-strong);
  }

  .tl-item {
    padding-left: 0;
    padding-top: var(--s-12);
  }
}

.after-note {
  margin: var(--s-10) 0 0;
  font-size: var(--t-14);
  color: var(--muted);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--t-14);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-4);
  overflow: hidden;
}

.spec-table th,
.spec-table td {
  padding: var(--s-3) var(--s-5);
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.spec-table tr:last-child th,
.spec-table tr:last-child td {
  border-bottom: 0;
}

.spec-table thead th {
  font-family: var(--font-mono);
  font-size: var(--t-12);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--panel-2);
}

.spec-table tbody th {
  font-weight: 500;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-family: var(--font-mono);
  font-size: var(--t-12);
  white-space: nowrap;
}

.status::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: none;
}

.status-yes::before {
  background: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-edge);
}

.status-no {
  color: var(--muted);
}

.status-no::before {
  border: 1.5px solid var(--faint);
}

.spec-note {
  display: block;
  margin-top: 2px;
  font-size: var(--t-12);
  color: var(--muted);
}

/* ================= FAQ disclosures ================= */

.faq-list {
  border-top: 1px solid var(--line);
}

.faq {
  border-bottom: 1px solid var(--line);
}

.faq summary {
  position: relative;
  display: block;
  padding: var(--s-5) var(--s-12) var(--s-5) 0;
  font-family: var(--font-display);
  font-size: var(--t-20);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
  cursor: pointer;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::before,
.faq summary::after {
  content: "";
  position: absolute;
  right: var(--s-2);
  top: 50%;
  width: 12px;
  height: 1.5px;
  background: var(--muted);
  transition: transform 0.25s var(--ease);
}

.faq summary::after {
  transform: rotate(90deg);
}

.faq[open] summary::after {
  transform: rotate(0deg);
}

.faq[open] summary::before {
  background: var(--accent-text);
}

.faq-a {
  padding: 0 0 var(--s-6);
  max-width: 68ch;
  color: var(--muted);
}

.faq-a p:last-child,
.faq-a ul:last-child {
  margin-bottom: 0;
}

.faq-a ul {
  padding-left: var(--s-5);
}

.more-link {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  margin-top: var(--s-8);
  font-weight: 600;
}

/* ================= Product page ================= */

.p-layout {
  display: grid;
  gap: var(--s-10);
  padding-block: var(--s-10) var(--s-24);
}

@media (min-width: 980px) {
  .p-layout {
    grid-template-columns: minmax(0, 380px) minmax(0, 1fr);
    gap: var(--s-16);
    align-items: start;
    padding-top: var(--s-16);
  }
}

.p-aside {
  min-width: 0;
}

@media (min-width: 980px) {
  .p-aside {
    position: sticky;
    top: calc(var(--header-h) + var(--s-6));
    max-height: calc(100vh - var(--header-h) - var(--s-12));
    overflow-y: auto;
    padding-right: var(--s-2);
  }
}

.crumbs {
  margin-bottom: var(--s-6);
  font-family: var(--font-mono);
  font-size: var(--t-12);
  color: var(--muted);
}

.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.crumbs li + li::before {
  content: "/";
  margin-right: var(--s-2);
  color: var(--faint);
}

.p-title {
  font-size: var(--t-display-s);
  font-weight: 700;
  letter-spacing: -0.045em;
  line-height: 1;
  margin-bottom: var(--s-6);
}

.p-specs {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--s-2) var(--s-4);
  margin: 0 0 var(--s-6);
  padding: var(--s-4) 0;
  border-block: 1px solid var(--line);
  font-size: var(--t-14);
}

.p-specs dt {
  font-family: var(--font-mono);
  font-size: var(--t-12);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 2px;
}

.p-specs dd {
  margin: 0;
}

.p-price {
  display: flex;
  align-items: baseline;
  gap: var(--s-2);
  margin: 0 0 var(--s-2);
}

.p-price .price {
  font-size: 3rem;
  line-height: 1;
  letter-spacing: -0.04em;
}

.p-currency {
  font-family: var(--font-mono);
  font-size: var(--t-12);
  color: var(--muted);
}

.p-terms {
  margin: 0 0 var(--s-5);
  font-size: var(--t-13);
  color: var(--muted);
}

.p-terms a {
  color: var(--text);
}

.buy-slot:empty {
  display: none;
}

.p-aside .buy-slot {
  margin-bottom: var(--s-5);
}

@media (max-width: 979px) {
  .p-aside .buy-slot {
    display: none;
  }
}

.p-selfstudy {
  margin: 0;
  padding: var(--s-3) var(--s-4);
  font-size: var(--t-13);
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: var(--r-2);
  background: var(--panel);
}

.p-main {
  min-width: 0;
}

.p-lead {
  margin-bottom: var(--s-12);
  font-size: var(--t-20);
  line-height: 1.55;
  color: var(--text);
  max-width: 62ch;
}

.p-sec {
  padding-block: var(--s-12);
  border-top: 1px solid var(--line);
}

.p-sec > h2 {
  font-size: var(--t-32);
  margin-bottom: var(--s-6);
}

.p-sec > p {
  max-width: 68ch;
}

/* numbered sequence with a filling line */
.seq {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.seq-track {
  position: absolute;
  left: 19px;
  top: 20px;
  bottom: 20px;
  width: 1px;
  background: var(--line-strong);
}

.seq-fill {
  position: absolute;
  inset: 0;
  background: var(--accent-text);
  transform-origin: top;
  transform: scaleY(0);
}

.seq-item {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: var(--s-5);
  padding-bottom: var(--s-8);
}

.seq-item:last-child {
  padding-bottom: 0;
}

.seq-num {
  position: relative;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  font-family: var(--font-mono);
  font-size: var(--t-12);
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-2);
}

.seq-num::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  border: 1px solid var(--accent-text);
  box-shadow: 0 0 0 3px var(--accent-soft);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}

.seq-item.is-active .seq-num::after {
  opacity: 1;
}

.seq-item h3 {
  margin: var(--s-2) 0 var(--s-2);
}

.seq-item p {
  margin: 0;
  color: var(--muted);
  max-width: 62ch;
}

.previews {
  display: grid;
  gap: var(--s-4);
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 560px) {
  .previews {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.preview {
  margin: 0;
  padding: var(--s-3);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-3);
}

.preview svg {
  width: 100%;
  height: auto;
  border-radius: var(--r-2);
}

@media (max-width: 559px) {
  .preview svg {
    max-width: 280px;
    margin-inline: auto;
  }
}

.preview figcaption {
  margin-top: var(--s-3);
  font-size: var(--t-13);
  color: var(--muted);
}

.preview figcaption strong {
  display: block;
  margin-bottom: var(--s-1);
  font-family: var(--font-mono);
  font-size: var(--t-12);
  font-weight: 500;
  color: var(--text);
}

.small-note {
  margin-top: var(--s-4);
  font-size: var(--t-13);
  color: var(--muted);
}

.callout {
  margin-top: var(--s-6);
  padding: var(--s-4) var(--s-5);
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent-text);
  border-radius: 0 var(--r-2) var(--r-2) 0;
  background: var(--panel);
  font-size: var(--t-14);
}

.callout p:last-child {
  margin: 0;
}

.fit {
  display: grid;
  gap: var(--s-4);
}

@media (min-width: 720px) {
  .fit {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.fit > div {
  padding: var(--s-5) var(--s-6);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-3);
}

.fit h3 {
  font-size: var(--t-18);
}

.check-list,
.cross-list {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--t-14);
}

.check-list li,
.cross-list li {
  position: relative;
  padding: var(--s-2) 0 var(--s-2) var(--s-6);
}

.check-list li::before,
.cross-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
}

.check-list li::before {
  background: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-edge);
}

.cross-list li::before {
  border: 1.5px solid var(--faint);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.chips a {
  display: inline-block;
  padding: var(--s-2) var(--s-3);
  font-size: var(--t-13);
  text-decoration: none;
  color: var(--muted);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-2);
}

@media (hover: hover) {
  .chips a:hover {
    color: var(--text);
    border-color: var(--line-strong);
  }
}

.plain-list {
  padding-left: var(--s-5);
}

.plain-list li {
  margin-bottom: var(--s-2);
}

/* mobile purchase bar */
.p-bar {
  display: none;
}

@media (max-width: 979px) {
  .has-pbar {
    padding-bottom: 96px;
  }

  .p-bar {
    position: fixed;
    left: var(--s-2);
    right: var(--s-2);
    bottom: calc(var(--s-2) + env(safe-area-inset-bottom, 0px));
    z-index: 40;
    display: flex;
    align-items: center;
    gap: var(--s-3);
    padding: var(--s-2) var(--s-2) var(--s-2) var(--s-4);
    min-height: 64px;
    background: var(--bg-glass);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    backdrop-filter: blur(14px) saturate(140%);
    border: 1px solid var(--line-strong);
    border-radius: var(--r-3);
    box-shadow: var(--shadow-lg);
    view-transition-name: p-bar;
  }

  .p-bar-info {
    flex: 1 1 auto;
    min-width: 0;
  }

  .p-bar-name {
    margin: 0;
    overflow: hidden;
    font-size: var(--t-13);
    font-weight: 600;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .p-bar-meta {
    margin: 0;
    font-size: var(--t-12);
    color: var(--muted);
  }

  .p-bar-meta .price {
    font-size: var(--t-14);
    color: var(--text);
  }

  .p-bar .buy-slot {
    flex: none;
  }

  .p-bar .btn-buy {
    width: auto;
    min-height: 44px;
    padding-inline: var(--s-4);
    font-size: var(--t-14);
  }
}

/* ================= Preview illustration palette ================= */

.s-paper { fill: var(--paper); stroke: var(--line-strong); }
.s-soft { fill: var(--panel-3); }
.s-bg { fill: var(--panel-2); stroke: var(--line-strong); }
.s-line { fill: var(--line-strong); }
.s-ink { fill: var(--text); }
.s-muted { fill: var(--muted); }
.s-accent { fill: var(--accent); }
.s-accent-soft { fill: var(--accent-soft); }
.s-stroke { fill: none; stroke: var(--muted); stroke-width: 1.5; }
.s-stroke-ink { fill: none; stroke: var(--text); stroke-width: 2; }
.s-stroke-faint { fill: none; stroke: var(--line-strong); stroke-width: 1; }
.s-astroke { fill: none; stroke: var(--accent); stroke-width: 2; }
.s-dash { fill: none; stroke: var(--line-strong); stroke-width: 1.5; stroke-dasharray: 4 4; }
.s-label { fill: var(--accent-text); font-family: var(--font-mono); font-size: 10px; font-weight: 500; letter-spacing: 0.08em; }
.s-num { fill: #0a0b0c; font-family: var(--font-mono); font-size: 11px; font-weight: 500; }
.s-num-inv { fill: var(--paper); font-family: var(--font-mono); font-size: 9px; font-weight: 500; }
.s-th { fill: var(--paper); font-family: var(--font-mono); font-size: 10px; font-weight: 500; letter-spacing: 0.04em; }
.s-td { fill: var(--text); font-family: var(--font-mono); font-size: 10.5px; font-weight: 500; }
.s-tdesc { fill: var(--muted); font-family: var(--font-body); font-size: 10.5px; }

/* ================= Docs layout (policies, FAQ, about) ================= */

.read-progress {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  z-index: 60;
  height: 2px;
  pointer-events: none;
}

.read-progress span {
  display: block;
  height: 100%;
  background: var(--accent-text);
  transform-origin: left;
  transform: scaleX(0);
}

.doc {
  display: grid;
  gap: var(--s-8);
  padding-block: var(--s-10) var(--s-24);
}

@media (min-width: 980px) {
  .doc {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: var(--s-16);
    padding-top: var(--s-16);
  }
}

.doc-toc {
  min-width: 0;
  font-size: var(--t-14);
}

@media (min-width: 980px) {
  .doc-toc {
    position: sticky;
    top: calc(var(--header-h) + var(--s-6));
    max-height: calc(100vh - var(--header-h) - var(--s-12));
    overflow-y: auto;
    align-self: start;
  }
}

@media (max-width: 979px) {
  .doc-toc {
    order: 2;
    padding: var(--s-4) var(--s-5);
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--r-3);
  }

  .doc-head {
    order: 1;
  }

  .doc-body {
    order: 3;
  }

  .doc {
    display: flex;
    flex-direction: column;
  }
}

.toc-title {
  margin: 0 0 var(--s-3);
  font-family: var(--font-mono);
  font-size: var(--t-12);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.toc-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--line);
}

.toc-list a {
  position: relative;
  display: block;
  padding: var(--s-1) 0 var(--s-1) var(--s-4);
  color: var(--muted);
  text-decoration: none;
  line-height: 1.45;
}

.toc-list a::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: var(--accent-text);
  opacity: 0;
  transition: opacity 0.2s var(--ease);
}

.toc-list a.is-current {
  color: var(--text);
}

.toc-list a.is-current::before {
  opacity: 1;
}

@media (hover: hover) {
  .toc-list a:hover {
    color: var(--text);
  }
}

.doc-main {
  min-width: 0;
  display: contents;
}

@media (min-width: 980px) {
  .doc-main {
    display: block;
  }
}

.doc-head {
  margin-bottom: var(--s-10);
  padding-bottom: var(--s-8);
  border-bottom: 1px solid var(--line);
}

.doc-head h1 {
  font-size: var(--t-display-m);
  max-width: 18ch;
}

.doc-head .lead {
  margin-bottom: var(--s-4);
}

.updated {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--t-12);
  color: var(--muted);
}

.doc-body {
  max-width: 68ch;
  min-width: 0;
}

.doc-body h2 {
  font-size: var(--t-24);
  letter-spacing: -0.025em;
  margin: 0;
}

.doc-body h3 {
  font-size: var(--t-18);
  margin: 0;
}

.h-wrap {
  display: flex;
  align-items: baseline;
  gap: var(--s-2);
  margin: var(--s-12) 0 var(--s-4);
}

.h-wrap.h3 {
  margin: var(--s-8) 0 var(--s-3);
}

.doc-body > .h-wrap:first-child,
.doc-body > section:first-child > .h-wrap:first-child {
  margin-top: 0;
}

.anchor {
  font-family: var(--font-mono);
  font-size: var(--t-14);
  color: var(--muted);
  text-decoration: none;
}

.anchor:focus-visible {
  color: var(--accent-text);
}

@media (hover: hover) {
  .anchor:hover {
    color: var(--accent-text);
  }
}

.doc-body ul,
.doc-body ol {
  padding-left: var(--s-5);
}

.doc-body li {
  margin-bottom: var(--s-2);
}

.doc-body li::marker {
  color: var(--faint);
}

.summary-box {
  margin: 0 0 var(--s-4);
  padding: var(--s-5) var(--s-6);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-3);
}

.summary-box ul {
  margin: 0;
}

.summary-box li:last-child {
  margin-bottom: 0;
}

.doc-body .faq-group + .faq-group {
  margin-top: var(--s-4);
}

.doc-body .faq-list {
  margin-top: var(--s-2);
}

/* text-heavy reveal: opacity only */
.fade-ready .fade {
  opacity: 0;
  transition: opacity 0.6s var(--ease);
}

.fade-ready .fade.is-in {
  opacity: 1;
}

/* ================= Contact ================= */

.contact {
  display: grid;
  gap: var(--s-10);
  padding-block: var(--s-10) var(--s-24);
}

@media (min-width: 980px) {
  .contact {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: var(--s-16);
    padding-top: var(--s-16);
  }
}

.contact h1 {
  font-size: var(--t-display-m);
}

.c-stack {
  display: grid;
  gap: var(--s-3);
}

.c-panel {
  padding: var(--s-6);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-3);
}

.c-panel h2 {
  margin-bottom: var(--s-3);
  font-family: var(--font-mono);
  font-size: var(--t-12);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.c-panel p:last-child,
.c-panel ul:last-child {
  margin-bottom: 0;
}

.c-big {
  margin-bottom: var(--s-2);
  font-family: var(--font-display);
  font-size: var(--t-32);
  font-weight: 650;
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.c-email {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 0.85rem + 0.9vw, 1.375rem);
  word-break: break-all;
  text-decoration-color: var(--accent-text);
}

.c-panel-accent {
  border-color: var(--line-strong);
  box-shadow: inset 2px 0 0 var(--accent-text);
}

/* ================= 404 ================= */

.nf {
  display: grid;
  justify-items: start;
  gap: var(--s-2);
  padding-block: var(--s-20) var(--s-24);
}

.nf-key {
  --ku: 96px;
  --kd: 9px;
  --kr: 14px;
  --kg: 0px;
  --w: 1.5;
  margin-bottom: var(--s-10);
}

.nf-key .key-label {
  font-size: 18px;
}

.nf h1 {
  font-size: var(--t-display-l);
  max-width: 12ch;
}

.nf-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3);
  margin-top: var(--s-4);
}

/* ================= Footer ================= */

.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--line);
  background: var(--panel);
  font-size: var(--t-14);
}

.footer-grid {
  display: grid;
  gap: var(--s-10);
  padding-block: var(--s-16) var(--s-12);
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .footer-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1.3fr) minmax(0, 0.7fr) minmax(0, 0.7fr);
  }
}

.footer-about p {
  max-width: 36ch;
  color: var(--muted);
}

.footer-email {
  font-family: var(--font-mono);
}

.footer-h {
  margin: 0 0 var(--s-4);
  font-family: var(--font-mono);
  font-size: var(--t-12);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.footer-links {
  display: grid;
  gap: var(--s-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  text-decoration: none;
  color: var(--text);
}

@media (hover: hover) {
  .footer-links a:hover {
    text-decoration: underline;
    text-decoration-color: var(--accent-text);
  }
}

.footer-keys {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: 0;
  font: inherit;
  font-size: var(--t-13);
  color: var(--muted);
  background: none;
  border: 0;
  cursor: pointer;
}

@media (hover: hover) {
  .footer-keys:hover {
    color: var(--text);
  }
}

.footer-base {
  display: grid;
  gap: var(--s-2);
  padding-block: var(--s-6) var(--s-10);
  border-top: 1px solid var(--line);
  font-size: var(--t-13);
  color: var(--muted);
}

.footer-base p {
  margin: 0;
}

/* ================= Dialogs ================= */

.dlg {
  width: min(640px, calc(100vw - 24px));
  max-height: min(560px, calc(100vh - 48px));
  margin: 12vh auto auto;
  padding: 0;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-4);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.dlg::backdrop {
  background: rgba(0, 0, 0, 0.55);
}

:root[data-theme="light"] .dlg::backdrop {
  background: rgba(20, 20, 15, 0.3);
}

.dlg[open] {
  display: flex;
  flex-direction: column;
}

@media (prefers-reduced-motion: no-preference) {
  .dlg[open] {
    animation: dlg-in 0.18s var(--ease);
  }
}

@keyframes dlg-in {
  from {
    opacity: 0;
    transform: translateY(-6px) scale(0.985);
  }

  to {
    opacity: 1;
    transform: none;
  }
}

.pal-input-row {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  padding: var(--s-3) var(--s-4);
  border-bottom: 1px solid var(--line);
}

.pal-input-row svg {
  width: 18px;
  height: 18px;
  flex: none;
  color: var(--muted);
}

.pal-input {
  flex: 1;
  min-width: 0;
  height: 40px;
  padding: 0;
  font: inherit;
  font-size: var(--t-18);
  color: var(--text);
  background: transparent;
  border: 0;
  outline: none;
}

.pal-input::placeholder {
  color: var(--muted);
}

.pal-list {
  flex: 1 1 auto;
  margin: 0;
  padding: var(--s-2);
  overflow-y: auto;
  list-style: none;
}

.pal-opt {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--s-3);
  padding: var(--s-2) var(--s-3);
  border-radius: var(--r-2);
  cursor: pointer;
}

.pal-opt[aria-selected="true"] {
  background: var(--panel-3);
  box-shadow: inset 2px 0 0 var(--accent-text);
}

.pal-kind {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.pal-title {
  overflow: hidden;
  font-size: var(--t-14);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.pal-title mark {
  background: none;
  color: var(--accent-text);
  font-weight: 600;
}

.pal-meta {
  font-family: var(--font-mono);
  font-size: var(--t-12);
  color: var(--muted);
}

.pal-empty {
  margin: 0;
  padding: var(--s-8) var(--s-4);
  text-align: center;
  font-size: var(--t-14);
  color: var(--muted);
}

.pal-foot {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2) var(--s-5);
  margin: 0;
  padding: var(--s-3) var(--s-4);
  border-top: 1px solid var(--line);
  font-size: var(--t-12);
  color: var(--muted);
  background: var(--panel-2);
}

.pal-foot kbd {
  font-size: 10px;
}

@media (max-width: 480px) {
  .pal-opt {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .pal-kind {
    display: none;
  }

  .pal-foot {
    display: none;
  }
}

.dlg-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  padding: var(--s-4) var(--s-5);
  border-bottom: 1px solid var(--line);
}

.dlg-head h2 {
  margin: 0;
  font-size: var(--t-20);
}

.dlg-scroll {
  overflow-y: auto;
  padding: var(--s-2) var(--s-5) var(--s-5);
}

.keys-list {
  margin: 0;
}

.keys-list > div {
  display: grid;
  grid-template-columns: minmax(96px, auto) minmax(0, 1fr);
  gap: var(--s-4);
  align-items: center;
  padding: var(--s-3) 0;
  border-bottom: 1px solid var(--line);
}

.keys-list dt {
  white-space: nowrap;
}

.keys-list dd {
  margin: 0;
  font-size: var(--t-14);
  color: var(--muted);
}

.keys-list .tag-single {
  margin-left: var(--s-2);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.switch-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--s-5);
  margin-top: var(--s-5);
  padding: var(--s-4);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--r-3);
}

.switch-label {
  margin: 0 0 var(--s-1);
  font-weight: 600;
  font-size: var(--t-14);
}

.switch-desc {
  margin: 0;
  font-size: var(--t-13);
  color: var(--muted);
}

.switch {
  position: relative;
  flex: none;
  width: 44px;
  height: 24px;
  padding: 0;
  background: var(--panel-3);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  cursor: pointer;
}

.switch-thumb {
  position: absolute;
  left: 3px;
  top: 3px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--muted);
  transition: transform 0.2s var(--ease);
}

.switch-on {
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: var(--accent);
  border: 1px solid var(--accent-edge);
  opacity: 0;
  transition: opacity 0.2s var(--ease);
}

.switch[aria-checked="true"] .switch-on {
  opacity: 1;
}

.switch[aria-checked="true"] .switch-thumb {
  transform: translateX(20px);
  background: var(--accent-ink);
}

/* ================= View transitions ================= */

@view-transition {
  navigation: auto;
}

::view-transition-old(root) {
  animation: vt-out 0.16s var(--ease) both;
}

::view-transition-new(root) {
  animation: vt-in 0.3s var(--ease) both;
}

@keyframes vt-out {
  to {
    opacity: 0;
  }
}

@keyframes vt-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
}

/* ================= Reduced motion ================= */

@media (prefers-reduced-motion: reduce) {
  @view-transition {
    navigation: none;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }

  .bento-ready .tile,
  .fade-ready .fade {
    opacity: 1;
    transform: none;
  }

  .read-progress {
    display: none;
  }
}

/* ================= Print ================= */

@media print {
  .site-header,
  .site-footer,
  .p-bar,
  .buy-slot,
  .read-progress,
  .doc-toc,
  .skip-link {
    display: none !important;
  }

  body::before {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }
}

/* ================= Additions ================= */

.art-video .clip-hi {
  fill: var(--accent-soft);
  stroke: var(--accent);
  stroke-width: 1.5;
}

@media (prefers-reduced-motion: reduce) {
  .kb-hint {
    display: none;
  }
}