/*
 * DSH Mobile App — 宣传站样式
 *
 * 色板沿用 App 的「漫反射电纸书」：日间暖石纸色、夜间暖炭电纸灰。
 * 不用纯黑纯白、不用渐变与发光；层次只靠纸色深浅和发丝线。
 * 纯 CSS，无外部字体。
 */

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

:root {
  color-scheme: light dark;

  --paper: #f4f2ed;
  --paper-sunk: #eae7e0;
  --paper-raised: #faf8f3;
  --line: #d8d5cc;
  --line-soft: #e2dfd7;
  --ink: #1c1c1a;
  --ink-2: #5c5b57;
  --ink-3: #8c8a84;
  --btn: #2b2b28;
  --btn-ink: #f4f2ed;
  --link: #2a5480;
  --live: #3f7a52;
  --live-bg: #e1ebe4;
  --amber: #5c4e2e;
  --amber-bg: #e6e0d0;
  --danger: #8a3b40;
  --danger-bg: #efe2e2;
  --bezel: #2b2b28;
  --bezel-edge: #3d3d39;

  --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", "Noto Sans CJK SC", sans-serif;
  --font-display: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "Noto Serif CJK SC",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Mono", Menlo, Consolas, "Liberation Mono",
    monospace;

  --wrap: 74rem;
  --gutter: clamp(1.25rem, 4.5vw, 3rem);
  --section-y: clamp(4.5rem, 10vw, 8rem);
  --radius: 0.875rem;
}

:root:lang(en) {
  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", "Noto Serif",
    Georgia, serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #252522;
    --paper-sunk: #1f1f1d;
    --paper-raised: #2e2e2a;
    --line: #3e3e39;
    --line-soft: #34342f;
    --ink: #cecbc2;
    --ink-2: #a29f96;
    --ink-3: #75736b;
    --btn: #c4c1b6;
    --btn-ink: #222220;
    --link: #93b5d9;
    --live: #9cc4a7;
    --live-bg: #28332b;
    --amber: #c8b68e;
    --amber-bg: #363228;
    --danger: #c08a8c;
    --danger-bg: #3a2c2c;
    --bezel: #161614;
    --bezel-edge: #45453f;
  }
}

/* ---------- Base ---------- */

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

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.75;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}

:lang(en) body,
body:lang(en) {
  line-height: 1.6;
}

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

a {
  color: inherit;
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--ink-3);
  text-underline-offset: 0.24em;
  transition: text-decoration-color 0.15s ease, color 0.15s ease;
}

a:hover {
  text-decoration-color: currentColor;
}

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

code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  padding: 0.08em 0.36em;
  border-radius: 0.3em;
  background: var(--paper-sunk);
  overflow-wrap: anywhere;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 600;
  text-wrap: balance;
}

p {
  margin: 0;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 10;
  padding: 0.5rem 0.9rem;
  border-radius: 0.5rem;
  background: var(--btn);
  color: var(--btn-ink);
  text-decoration: none;
}

.skip:focus {
  top: 1rem;
}

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

/* ---------- Masthead ---------- */

.masthead {
  position: sticky;
  top: 0;
  z-index: 5;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.masthead__inner {
  display: flex;
  align-items: center;
  gap: 0.5rem 2rem;
  min-height: 4.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-right: auto;
  font-weight: 650;
  letter-spacing: 0.005em;
  text-decoration: none;
  white-space: nowrap;
}

.brand__mark {
  position: relative;
  flex: none;
  width: 0.8rem;
  height: 1.25rem;
  border: 1.5px solid currentColor;
  border-radius: 0.28rem;
}

.brand__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0.2rem;
  width: 0.28rem;
  height: 0.28rem;
  margin-left: -0.14rem;
  border-radius: 50%;
  background: var(--live);
}

.nav {
  display: flex;
  gap: 1.75rem;
  font-size: 0.94rem;
}

.nav a,
.lang {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  color: var(--ink-2);
  text-decoration: none;
  white-space: nowrap;
}

.nav a:hover,
.lang:hover {
  color: var(--ink);
}

.lang {
  min-width: 44px;
  padding: 0.18rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}

@media (max-width: 48rem) {
  html {
    /* Keep anchor targets below the two-row mobile navigation. */
    scroll-padding-top: 9rem;
  }

  .masthead__inner {
    flex-wrap: wrap;
    padding-block: 0.85rem 0.7rem;
  }

  .nav {
    order: 3;
    width: 100%;
    gap: clamp(0.5rem, 3vw, 1.35rem);
    font-size: 0.9rem;
  }
}

/* ---------- Shared type ---------- */

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink-2);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}

.eyebrow::before {
  content: "";
  flex: none;
  width: 1.5rem;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}

.display {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.28;
}

:lang(en) .display {
  font-weight: 500;
  letter-spacing: -0.012em;
  line-height: 1.12;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- Buttons ---------- */

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  min-height: 3rem;
  padding: 0.7rem 1.35rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.98rem;
  line-height: 1.2;
  text-decoration: none;
  transition: background-color 0.15s ease, transform 0.15s ease;
}

.btn--primary {
  background: var(--btn);
  color: var(--btn-ink);
}

.btn--primary:hover {
  background: color-mix(in srgb, var(--btn) 88%, var(--paper));
}

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

.btn__glyph {
  width: 1rem;
  height: 1rem;
  flex: none;
}

.link-quiet {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 2.75rem;
  font-weight: 550;
  text-decoration: none;
}

.link-quiet span[aria-hidden] {
  transition: transform 0.18s ease;
}

.link-quiet:hover span[aria-hidden] {
  transform: translateX(3px);
}

.link-quiet:hover {
  text-decoration: underline;
  text-decoration-color: var(--ink-3);
}

/* ---------- Hero ---------- */

.hero {
  padding-block: clamp(3rem, 8vw, 6.5rem) clamp(4rem, 9vw, 7rem);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  align-items: center;
  gap: clamp(2.5rem, 6vw, 6rem);
}

.hero h1 {
  margin-top: 1.6rem;
  font-size: clamp(2.3rem, 4.6vw, 3.7rem);
}

.hero .lede {
  max-width: 34em;
  margin-top: 1.6rem;
  color: var(--ink-2);
  font-size: clamp(1.04rem, 1.4vw, 1.16rem);
}

.hero .actions {
  margin-top: 2.25rem;
}

.terms {
  display: grid;
  gap: 0.55rem;
  margin: 2.6rem 0 0;
  padding: 1.35rem 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
  color: var(--ink-2);
  font-size: 0.9rem;
}

.terms li {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
}

.terms li::before {
  content: "";
  flex: none;
  width: 0.36rem;
  height: 0.36rem;
  border: 1px solid var(--ink-3);
  border-radius: 50%;
  transform: translateY(-0.12em);
}

.hero__figure {
  margin: 0;
  justify-self: center;
}

.stage {
  position: relative;
  display: grid;
  place-items: center;
  padding: clamp(1.5rem, 4vw, 3rem) clamp(1.5rem, 5vw, 3.75rem);
  border-radius: 1.75rem;
  background: var(--paper-sunk);
}

.plate {
  display: flex;
  gap: 0.75rem;
  max-width: 24rem;
  margin: 1rem auto 0;
  color: var(--ink-2);
  font-size: 0.8rem;
  line-height: 1.55;
}

.plate b {
  flex: none;
  font-weight: 600;
  color: var(--ink);
}

@media (max-width: 60rem) {
  .hero__grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero__figure {
    width: 100%;
  }

  .stage {
    max-width: 30rem;
    margin-inline: auto;
  }
}

/* ---------- Pet and gesture highlights ---------- */

.highlights {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
}

.highlight {
  min-width: 0;
}

.highlight figure {
  margin: 0 0 1.5rem;
}

.highlight__visual {
  display: grid;
  place-items: center;
  align-content: center;
  gap: 1rem;
  min-height: 21rem;
  padding: 1.5rem 1.25rem;
  border-radius: 1.5rem;
  background: var(--paper-sunk);
}

.demo-visual {
  min-height: 35rem;
  align-content: start;
}

.demo-visual button,
.demo-visual input {
  font-family: inherit;
}

.demo-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  font-size: 0.8rem;
}

.demo-controls button,
.arc-demo__close {
  min-height: 44px;
  padding: 0.4rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 0.6rem;
  background: var(--paper-raised);
  color: var(--ink);
  font-size: 0.8rem;
  cursor: pointer;
}

.demo-controls button:disabled {
  opacity: 0.45;
  cursor: default;
}

.demo-controls output {
  min-width: 2.5rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.demo-motion {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  width: 100%;
  color: var(--ink-2);
  cursor: pointer;
}

.demo-motion input {
  flex: none;
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--link);
}

.demo-status {
  width: 100%;
  min-height: 4.5em;
  color: var(--ink-2);
  font-size: 0.8rem;
  line-height: 1.5;
}

.pet-demo__stage,
.plugin-demo__zone {
  position: relative;
  width: 100%;
  height: 16rem;
  min-width: 0;
}

.pet-demo__pet {
  position: absolute;
  left: 50%;
  bottom: 0.75rem;
  width: 8rem;
  padding: 0;
  border: 0;
  background: transparent;
  transform: translateX(-50%);
  touch-action: pan-y;
  user-select: none;
  cursor: grab;
}

.pet-demo__pet:active {
  cursor: grabbing;
}

.pet-demo__pet img {
  width: 100%;
  height: auto;
  pointer-events: none;
}

.pet-demo__chat {
  padding: 0.6rem;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  background: var(--paper-raised);
  font-size: 0.8rem;
  text-align: center;
}

.plugin-demo__zone {
  display: grid;
  place-items: center;
  overflow: clip;
  padding: 0.5rem;
  border-radius: 1rem;
  touch-action: pan-y pinch-zoom;
  user-select: none;
  cursor: grab;
}

.plugin-demo__zone:active {
  cursor: grabbing;
}

.plugin-demo__zone .plugin-preview {
  min-height: 14rem;
  transition: transform 180ms ease;
}

.plugin-demo__zone[data-dragging] .plugin-preview {
  transition: none;
}

.gesture-hint {
  color: var(--ink-2);
  font-size: 0.75rem;
  line-height: 1.5;
  text-align: center;
}

.highlight figcaption,
.highlights__caption {
  margin-top: 0.8rem;
  color: var(--ink-2);
  font-size: 0.8rem;
  line-height: 1.55;
}

.highlights__caption {
  margin-top: 2rem;
}

.highlight h3 {
  font-size: 1.25rem;
  line-height: 1.4;
}

.highlight > p {
  margin-top: 0.85rem;
  color: var(--ink-2);
}

.highlight .highlight__note {
  font-size: 0.85rem;
}

.plugin-preview {
  width: min(100%, 15rem);
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--paper-raised);
  box-shadow: 5px 5px 0 var(--paper-sunk), 6px 6px 0 var(--line);
}

.plugin-preview > h4 {
  margin: 0.5rem 0 0;
  font-size: 1.05rem;
  line-height: 1.4;
}

.plugin-preview > p {
  margin-top: 0.35rem;
  color: var(--ink-2);
  font-size: 0.8rem;
}

.arc-demo__conversation {
  position: absolute;
  inset: 0 2.5rem 0 0;
  padding: 0.9rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--paper-raised);
  font-size: 0.8rem;
  line-height: 1.5;
  transition: opacity 150ms ease;
}

.arc-demo__conversation h4 {
  margin: 0.75rem 0;
  font-size: 1rem;
}

.arc-demo__conversation p + p {
  margin-top: 0.75rem;
}

.arc-demo__reply {
  padding: 0.6rem;
  border-radius: 0.65rem;
  background: var(--paper-sunk);
}

[data-arc-demo][data-open] .arc-demo__conversation {
  opacity: 0.2;
}

.arc-demo__menu {
  position: absolute;
  inset: 0;
}

.arc-demo__close {
  position: absolute;
  right: 3rem;
  bottom: 0;
  font-size: 0.8rem;
}

.arc-preview {
  position: relative;
  width: 100%;
  height: 16rem;
}

.arc-preview__track {
  position: absolute;
  inset: 0 2rem 2rem auto;
  width: 5rem;
  border-left: 1px solid var(--ink-3);
  border-radius: 50% 0 0 50%;
}

.arc-preview__item {
  position: absolute;
  top: 0.5rem;
  right: 3rem;
  display: grid;
  gap: 0.2rem;
  width: calc(100% - 5rem);
  min-height: 3.5rem;
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  background: var(--paper-raised);
  color: var(--ink);
  font-size: 0.8rem;
  line-height: 1.4;
  text-align: left;
  cursor: pointer;
}

.arc-preview__item .ui-tag {
  justify-self: start;
}

.arc-preview__item[data-index="1"] {
  top: 4.75rem;
  right: 4rem;
}

.arc-preview__item[data-index="2"] {
  top: 9rem;
}

.arc-preview__item.is-preview {
  border-color: var(--link);
  box-shadow: 0 0 0 1px var(--link);
}

.arc-preview__item[aria-pressed="true"] b::after {
  content: " ·";
  color: var(--link);
}

.arc-preview__handle {
  position: absolute;
  top: 50%;
  right: -0.25rem;
  display: grid;
  place-items: center;
  width: 44px;
  height: 4.5rem;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: var(--btn);
  color: var(--btn-ink);
  transform: translateY(-50%);
  touch-action: none;
  user-select: none;
  cursor: ns-resize;
}

@media (prefers-reduced-motion: reduce) {
  .plugin-demo__zone .plugin-preview,
  .arc-demo__conversation {
    transition: none;
  }
}

@media (max-width: 60rem) {
  .highlights {
    grid-template-columns: minmax(0, 1fr);
    max-width: 30rem;
    margin-inline: auto;
    gap: 3rem;
  }
}

/* ---------- Phone illustration ---------- */

.phone {
  --u: 0.8rem;
  width: min(19.5rem, 100%);
  padding: 0.55rem;
  border-radius: 2.6rem;
  background: var(--bezel);
  box-shadow:
    inset 0 0 0 1px var(--bezel-edge),
    0 1px 0 rgb(0 0 0 / 0.04),
    0 24px 48px -28px rgb(40 36 28 / 0.45);
  font-size: var(--u);
  line-height: 1.45;
  user-select: none;
}

.phone__screen {
  display: flex;
  flex-direction: column;
  min-height: 38rem;
  overflow: hidden;
  border-radius: 2.1rem;
  background: var(--paper);
  color: var(--ink);
}

.ui-status {
  display: flex;
  justify-content: center;
  padding: 0.7em 0 0.3em;
}

.ui-status::before {
  content: "";
  width: 5.5em;
  height: 1.55em;
  border-radius: 999px;
  background: var(--bezel);
}

.ui-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9em 1.25em 0.4em;
}

.ui-gw {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-weight: 600;
  font-size: 1.08em;
}

.ui-gw .caret {
  color: var(--ink-3);
  font-weight: 400;
}

.dot {
  display: inline-block;
  flex: none;
  width: 0.55em;
  height: 0.55em;
  border-radius: 50%;
  background: var(--ink-3);
}

.dot--live {
  background: var(--live);
}

.ui-ws {
  padding: 0.2em 0.65em;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-2);
  font-family: var(--font-mono);
  font-size: 0.82em;
}

.ui-h {
  padding: 0.9em 1.25em 0.55em;
  color: var(--ink-2);
  font-size: 0.86em;
  letter-spacing: 0.06em;
}

.ui-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6em;
  padding: 0 1em;
}

.ui-card {
  display: flex;
  flex-direction: column;
  gap: 0.3em;
  min-height: 8.6em;
  padding: 0.85em 0.85em 0.8em;
  border: 1px solid var(--line-soft);
  border-radius: 1em;
  background: var(--paper-raised);
}

.ui-card b {
  font-weight: 600;
  font-size: 1.02em;
  line-height: 1.3;
}

.ui-card--attn {
  border-color: var(--line);
}

.ui-path {
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: 0.78em;
}

.ui-snip {
  margin-top: auto;
  color: var(--ink-2);
  font-size: 0.86em;
  line-height: 1.4;
}

.ui-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  align-self: flex-start;
  margin-bottom: 0.15em;
  padding: 0.12em 0.55em;
  border-radius: 999px;
  background: var(--paper-sunk);
  color: var(--ink-2);
  font-size: 0.78em;
  font-weight: 600;
}

.ui-tag--amber {
  background: var(--amber-bg);
  color: var(--amber);
}

.ui-tag--live {
  background: var(--live-bg);
  color: var(--live);
}

.ui-orb-wrap {
  display: grid;
  place-items: center;
  gap: 0.6em;
  margin-top: auto;
  padding: 1.2em 0 1em;
}

.ui-pet-dock {
  display: flex;
  align-items: center;
  gap: 1.5em;
}

.ui-pet-dock img {
  width: 8.3em;
  height: auto;
}

.ui-orb {
  display: grid;
  place-items: center;
  width: 4.2em;
  height: 4.2em;
  border-radius: 50%;
  background: var(--btn);
  color: var(--btn-ink);
  box-shadow: 0 0 0 0.45em var(--paper-sunk);
}

.ui-orb svg {
  width: 1.5em;
  height: 1.5em;
}

.ui-orb-label {
  padding-inline: 0.75em;
  color: var(--ink-3);
  font-size: 0.8em;
  text-align: center;
}

.ui-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 0.75em 0.6em 1.1em;
  border-top: 1px solid var(--line-soft);
  background: var(--paper-sunk);
  color: var(--ink-3);
  font-size: 0.8em;
  text-align: center;
}

.ui-tabs .is-on {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- Sections ---------- */

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

.section__head {
  display: grid;
  grid-template-columns: 13rem minmax(0, 1fr);
  gap: 1rem clamp(2rem, 5vw, 4rem);
  margin-bottom: clamp(2.75rem, 6vw, 4.5rem);
}

.section__head h2 {
  font-size: clamp(1.85rem, 3.6vw, 2.75rem);
}

.section__head .intro {
  max-width: 36em;
  margin-top: 1rem;
  color: var(--ink-2);
}

.section__head .eyebrow {
  align-self: start;
  padding-top: 0.75rem;
}

@media (max-width: 60rem) {
  .section__head {
    grid-template-columns: minmax(0, 1fr);
  }

  .section__head .eyebrow {
    padding-top: 0;
  }
}

/* ---------- Scenes ---------- */

.scenes {
  display: grid;
  gap: clamp(4rem, 9vw, 7rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.scene {
  display: grid;
  grid-template-columns: 13rem minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 1.5rem clamp(2rem, 5vw, 4rem);
  align-items: start;
}

@media (min-width: 60.01rem) {
  .scene__text {
    padding-top: 2.75rem;
  }

  .scene__no {
    padding-top: 3rem !important;
  }
}

.scene__no {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  align-self: start;
  padding-top: 0.35rem;
}

.scene__no .mono {
  color: var(--ink-3);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
}

.scene__no span:last-child {
  color: var(--ink);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.scene h3 {
  font-size: clamp(1.35rem, 2.1vw, 1.6rem);
}

.scene__text p {
  margin-top: 1rem;
  color: var(--ink-2);
}

.scene__text .note {
  margin-top: 1.25rem;
  padding-left: 0.9rem;
  border-left: 2px solid var(--line);
  font-size: 0.9rem;
}

.scene__fig {
  margin: 0;
}

.tray {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  place-items: center;
  min-height: 19rem;
  padding: clamp(1.5rem, 4vw, 2.75rem);
  border-radius: 1.5rem;
  background: var(--paper-sunk);
}

.scene__fig figcaption {
  margin-top: 0.8rem;
  color: var(--ink-2);
  font-size: 0.8rem;
}

.scene__fig figcaption b {
  margin-right: 0.5rem;
  color: var(--ink);
  font-weight: 600;
}

@media (max-width: 60rem) {
  .scene {
    grid-template-columns: minmax(0, 1fr);
  }

  .scene__no {
    flex-direction: row;
    gap: 0.75rem;
    align-items: baseline;
  }
}

/* Fragment UI (inside trays) */

.frag {
  width: min(22rem, 100%);
  font-size: 0.86rem;
  line-height: 1.45;
  user-select: none;
}

.frag-card {
  padding: 1.1em 1.15em;
  border: 1px solid var(--line-soft);
  border-radius: 1.1em;
  background: var(--paper-raised);
  box-shadow: 0 18px 36px -30px rgb(40 36 28 / 0.5);
}

/* gateway switcher */
.menu {
  padding: 0.45em;
}

.menu__row {
  display: flex;
  align-items: center;
  gap: 0.75em;
  padding: 0.8em 0.8em;
  border-radius: 0.75em;
}

.menu__row + .menu__row {
  margin-top: 0.1em;
}

.menu__row.is-on {
  background: var(--paper-sunk);
}

.menu__row b {
  font-weight: 600;
}

.menu__row small {
  margin-left: auto;
  color: var(--ink-3);
  font-size: 0.86em;
}

.menu__row--add {
  margin-top: 0.35em !important;
  border-top: 1px solid var(--line-soft);
  border-radius: 0 0 0.75em 0.75em;
  color: var(--ink-2);
}

.dot--idle {
  background: transparent;
  box-shadow: inset 0 0 0 1.5px var(--ink-3);
}

.queue {
  margin-top: 0.9em;
  display: grid;
  gap: 0.45em;
}

.queue__row {
  display: flex;
  align-items: center;
  gap: 0.7em;
  padding: 0.65em 0.9em;
  border-radius: 0.8em;
  background: var(--paper-raised);
  border: 1px solid var(--line-soft);
}

.queue__row .ui-tag {
  margin: 0;
}

.queue__row span:last-child {
  color: var(--ink-2);
}

/* approval */
.appr__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5em;
}

.appr__head b {
  font-weight: 600;
}

.risk {
  padding: 0.12em 0.6em;
  border-radius: 999px;
  background: var(--danger-bg);
  color: var(--danger);
  font-size: 0.82em;
  font-weight: 600;
}

.cmd {
  margin: 0.85em 0 0;
  padding: 0.8em 0.95em;
  border-radius: 0.7em;
  background: var(--paper-sunk);
  font-family: var(--font-mono);
  font-size: 0.88em;
  white-space: pre-wrap;
  word-break: break-all;
}

.cmd::before {
  content: "$ ";
  color: var(--ink-3);
}

.appr__why {
  margin-top: 0.75em;
  color: var(--ink-2);
  font-size: 0.92em;
}

.appr__acts {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 0.6em;
  margin-top: 1.1em;
}

.ui-btn {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 2.8em;
  overflow: hidden;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--ink-2);
  font-weight: 600;
}

.ui-btn--hold {
  border-color: var(--btn);
  color: var(--btn);
}

.ui-btn--hold .fill {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  height: 100%;
  width: 62%;
  background: var(--line);
  background: color-mix(in srgb, var(--btn) 18%, var(--paper-raised));
  animation: hold 4s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

.ui-btn--hold .label {
  position: relative;
  color: var(--ink);
}

@keyframes hold {
  0% {
    width: 62%;
  }

  30%,
  56% {
    width: 100%;
  }

  70%,
  82% {
    width: 0;
  }

  100% {
    width: 62%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ui-btn--hold .fill {
    animation: none;
    width: 62%;
  }
}

.annot {
  display: flex;
  justify-content: flex-end;
  gap: 0.5em;
  margin-top: 0.75em;
  color: var(--ink-2);
  font-size: 0.86em;
}

.annot::before {
  content: "";
  width: 1.5em;
  height: 1px;
  margin-top: 0.75em;
  background: var(--ink-3);
}

/* conversation */
.convo {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.7em;
}

.bubble {
  justify-self: end;
  max-width: 82%;
  padding: 0.65em 0.95em;
  border-radius: 1.05em 1.05em 0.3em 1.05em;
  background: var(--paper-sunk);
}

.trace {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  justify-self: start;
  padding: 0.35em 0.85em;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-2);
  font-size: 0.86em;
}

.reply {
  color: var(--ink);
}

.reply code {
  font-size: 0.9em;
  background: var(--paper-sunk);
}

.composer {
  margin-top: 0.4em;
  padding: 0.7em;
  border: 1px solid var(--line);
  border-radius: 1.2em;
  background: var(--paper-raised);
}

.queued {
  display: flex;
  align-items: center;
  gap: 0.6em;
  margin-bottom: 0.6em;
  padding: 0.45em 0.7em;
  border-radius: 0.7em;
  background: var(--paper-sunk);
  color: var(--ink-2);
  font-size: 0.86em;
}

.composer__row {
  display: flex;
  align-items: center;
  gap: 0.6em;
}

.seg {
  display: inline-flex;
  padding: 0.18em;
  border-radius: 999px;
  background: var(--paper-sunk);
  font-size: 0.84em;
}

.seg span {
  padding: 0.25em 0.75em;
  border-radius: 999px;
  color: var(--ink-3);
}

.seg .is-on {
  background: var(--paper-raised);
  color: var(--ink);
  font-weight: 600;
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.08);
}

.composer__input {
  flex: 1;
  min-width: 0;
  color: var(--ink-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mic {
  display: grid;
  place-items: center;
  flex: none;
  width: 2.5em;
  height: 2.5em;
  border-radius: 50%;
  background: var(--btn);
  color: var(--btn-ink);
}

.mic svg {
  width: 1.15em;
  height: 1.15em;
}

/* ---------- Ledger (capabilities vs. conditions) ---------- */

.ledger {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ink);
}

.ledger__labels {
  display: grid;
  grid-template-columns: 13rem minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(2rem, 5vw, 4rem);
  padding: 0 0 0.75rem;
  color: var(--ink-2);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
}

.ledger li {
  display: grid;
  grid-template-columns: 13rem minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 0.5rem clamp(2rem, 5vw, 4rem);
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
}

.ledger h3 {
  grid-column: 2;
  font-size: 1.08rem;
  line-height: 1.5;
}

.ledger p {
  color: var(--ink-2);
  font-size: 0.96rem;
}

.ledger p .tag {
  display: none;
}

@media (max-width: 60rem) {
  .ledger__labels {
    display: none;
  }

  .ledger li {
    grid-template-columns: minmax(0, 1fr);
    padding: 1.35rem 0;
  }

  .ledger h3 {
    grid-column: 1;
  }

  .ledger p .tag {
    display: inline;
    margin-right: 0.5em;
    color: var(--ink);
    font-weight: 600;
  }
}

/* ---------- Steps ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.step {
  display: flex;
  flex-direction: column;
  padding-top: 1.4rem;
  border-top: 1px solid var(--ink);
  counter-increment: step;
}

.step::before {
  content: counter(step);
  margin-bottom: 1.4rem;
  color: var(--ink-3);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-size: 2.6rem;
  line-height: 1;
  font-variant-numeric: oldstyle-nums;
}

.step h3 {
  font-size: 1.22rem;
  line-height: 1.45;
}

.step p {
  margin-top: 0.8rem;
  color: var(--ink-2);
  font-size: 0.96rem;
}

.step .links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  margin-top: auto;
  padding-top: 1.25rem;
  font-size: 0.92rem;
}

.step .links a {
  display: inline-flex;
  align-items: center;
  min-height: 2.25rem;
}

.preflight {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.25rem 1.25rem;
  margin-top: clamp(2.5rem, 5vw, 3.5rem);
  padding: 1.3rem 1.5rem;
  border-radius: var(--radius);
  background: var(--paper-sunk);
  font-size: 0.94rem;
}

.preflight b {
  font-weight: 600;
}

.preflight p {
  color: var(--ink-2);
}

@media (max-width: 60rem) {
  .steps {
    grid-template-columns: minmax(0, 1fr);
    gap: 2.5rem;
  }

  .step::before {
    margin-bottom: 0.9rem;
    font-size: 2.1rem;
  }

  .preflight {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- FAQ ---------- */

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

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

.faq summary {
  position: relative;
  display: block;
  padding: 1.35rem 3rem 1.35rem 0;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.06rem;
  line-height: 1.5;
  list-style: none;
}

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

.faq summary::before,
.faq summary::after {
  content: "";
  position: absolute;
  right: 0.35rem;
  top: 50%;
  width: 0.85rem;
  height: 1.5px;
  background: var(--ink-2);
  transition: transform 0.22s ease;
}

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

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

.faq summary:hover {
  color: var(--ink);
}

.faq summary:focus-visible {
  outline-offset: -2px;
}

.faq .answer {
  max-width: 44em;
  padding: 0 3rem 1.6rem 0;
  color: var(--ink-2);
}

.faq .answer p + p {
  margin-top: 0.75rem;
}

.faq-layout {
  display: grid;
  grid-template-columns: 13rem minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4rem);
}

@media (max-width: 60rem) {
  .faq-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .faq-layout > .spacer {
    display: none;
  }

  .faq .answer {
    padding-right: 0;
  }
}

/* ---------- Closing ---------- */

.closing {
  padding-block: clamp(5rem, 12vw, 9rem);
  border-top: 1px solid var(--line);
  background: var(--paper-sunk);
  text-align: center;
}

.closing h2 {
  max-width: 16em;
  margin-inline: auto;
  font-size: clamp(1.9rem, 4.4vw, 3.2rem);
}

.closing p {
  max-width: 34em;
  margin: 1.25rem auto 0;
  color: var(--ink-2);
}

.closing .actions {
  justify-content: center;
  margin-top: 2.5rem;
}

.closing .more {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.75rem;
  margin-top: 1.75rem;
  font-size: 0.94rem;
}

.closing .more a {
  display: inline-flex;
  align-items: center;
  min-height: 2.25rem;
  color: var(--ink-2);
}

/* ---------- Footer ---------- */

.footer {
  padding-block: 2.5rem 3rem;
  border-top: 1px solid var(--line);
  color: var(--ink-2);
  font-size: 0.86rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.5rem 3rem;
  align-items: start;
}

.footer .brand {
  color: var(--ink);
  margin-bottom: 0.75rem;
}

.footer p + p {
  margin-top: 0.35rem;
}

.footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
}

.footer nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
}

@media (max-width: 40rem) {
  .footer__grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- Print ---------- */

@media print {
  .masthead {
    position: static;
  }

  .masthead nav,
  .lang,
  .stage,
  .tray {
    display: none;
  }

  .faq details:not([open]) .answer {
    display: block;
  }
}