@font-face {
  font-family: "Source Han Sans CN";
  src: url("assets/fonts/SourceHanSansCN-VF.woff") format("woff");
  font-style: normal;
  font-weight: 200 900;
  font-display: swap;
}

:root {
  color-scheme: dark;
  --black: #08090b;
  --black-soft: #101216;
  --paper: #efede7;
  --ink: #101114;
  --white: #f7f5ef;
  --muted-dark: #68696f;
  --line: rgba(247, 245, 239, 0.14);
  --line-dark: rgba(16, 17, 20, 0.15);
  --accent: #f26164;
  --accent-deep: #d84b50;
  --shell: min(1240px, calc(100vw - 64px));
  --radius: 24px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background: var(--black);
  color: var(--white);
  font-family: "Source Han Sans CN", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.dialog-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { border: 0; color: inherit; font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

:focus-visible {
  outline: 3px solid rgba(242, 97, 100, 0.55);
  outline-offset: 4px;
}

.section-shell {
  width: var(--shell);
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 12px;
  left: 12px;
  transform: translateY(-150%);
  border-radius: 10px;
  background: var(--paper);
  color: var(--ink);
  padding: 10px 14px;
  transition: transform 0.2s ease;
}

.skip-link:focus { transform: none; }

.site-header {
  position: fixed;
  z-index: 100;
  top: 18px;
  left: 50%;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: min(1240px, calc(100vw - 40px));
  height: 68px;
  padding: 0 10px 0 18px;
  transform: translateX(-50%);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  background: rgba(9, 10, 12, 0.62);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(24px) saturate(1.2);
  transition: top 0.3s ease, background 0.3s ease, border-color 0.3s ease;
}

.site-header.is-scrolled {
  top: 10px;
  border-color: rgba(255, 255, 255, 0.14);
  background: rgba(9, 10, 12, 0.86);
}

.brand, .footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: max-content;
  font-weight: 720;
  letter-spacing: -0.03em;
}

.brand img, .footer-brand img { border-radius: 9px; }
.brand { justify-self: start; font-size: 19px; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 3px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.025);
  padding: 4px;
  color: rgba(247, 245, 239, 0.7);
  font-size: 15px;
  font-weight: 650;
}

.site-nav a {
  border-radius: 9px;
  padding: 9px 11px;
  transition: color 0.2s ease, background 0.2s ease;
}

.site-nav a:hover {
  background: rgba(255, 255, 255, 0.07);
  color: var(--white);
}

.mobile-nav-app { display: none; }

.header-actions {
  display: flex;
  justify-self: end;
  gap: 8px;
}

.header-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 21px;
  border-radius: 12px;
  background: var(--paper);
  color: var(--ink);
  font-size: 15px;
  font-weight: 720;
  transition: background 0.2s ease, transform 0.2s ease;
}

.header-action:hover { transform: translateY(-1px); background: #fff; }

.header-action-app {
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.055);
  color: var(--white);
}

.header-action-app:hover {
  border-color: rgba(242, 97, 100, 0.46);
  background: rgba(242, 97, 100, 0.12);
}

.menu-button { display: none; }

.hero {
  position: relative;
  overflow: hidden;
  padding: 178px 0 108px;
  background:
    radial-gradient(circle at 50% 25%, rgba(242, 97, 100, 0.12), transparent 29rem),
    radial-gradient(circle at 18% 56%, rgba(93, 105, 255, 0.08), transparent 34rem),
    var(--black);
}

.hero::before {
  position: absolute;
  inset: 0;
  opacity: 0.22;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.024) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.024) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, black, transparent 72%);
  content: "";
  pointer-events: none;
}

.hero-copy {
  position: relative;
  z-index: 2;
  text-align: center;
}

.overline {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  margin: 0 0 34px;
  color: rgba(247, 245, 239, 0.56);
  font-size: 13px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.overline span:first-child {
  border: 1px solid rgba(242, 97, 100, 0.38);
  border-radius: 99px;
  background: rgba(242, 97, 100, 0.08);
  color: #ff8c8f;
  padding: 8px 12px;
}

.hero h1, .principles h2, .enrichment h2, .listening h2, .library h2, .appearance h2, .developer-api h2, .deployment h2, .closing h2 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.04;
}

.hero h1 { font-size: clamp(54px, 6.2vw, 92px); }
.hero h1 em { color: var(--accent); font-style: normal; }

.hero-lead {
  max-width: 720px;
  margin: 36px auto 0;
  color: rgba(247, 245, 239, 0.7);
  font-size: clamp(17px, 1.4vw, 19px);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 38px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 13px;
  font-size: 14px;
  font-weight: 720;
  transition: transform 0.22s ease, background 0.22s ease, border-color 0.22s ease;
}

.button:hover { transform: translateY(-2px); }

.button-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 16px 38px rgba(216, 75, 80, 0.24);
}

.button-primary:hover { background: #ff6e71; }

.button-secondary {
  border-color: rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.045);
  color: var(--white);
}

.button-secondary:hover {
  border-color: rgba(255, 255, 255, 0.28);
  background: rgba(255, 255, 255, 0.08);
}

.hero-facts {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin: 30px 0 0;
  padding: 0;
  color: rgba(247, 245, 239, 0.68);
  font-size: 14px;
  list-style: none;
}

.hero-stage {
  position: relative;
  z-index: 1;
  margin-top: 92px;
}

.stage-halo {
  position: absolute;
  z-index: -1;
  inset: 3% 7% -12%;
  border-radius: 45%;
  background: radial-gradient(ellipse, rgba(242, 97, 100, 0.28), rgba(83, 64, 125, 0.12) 40%, transparent 68%);
  filter: blur(42px);
}

.product-frame {
  overflow: hidden;
  margin: 0;
  border: 1px solid rgba(16, 17, 20, 0.12);
  border-radius: var(--radius);
  background: #0f1115;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.18);
}

.product-frame-hero {
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow: 0 48px 120px rgba(0, 0, 0, 0.54);
}

.frame-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
  padding: 0 19px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
  background: #121419;
  color: rgba(247, 245, 239, 0.56);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.frame-bar button, .player-showcase button {
  cursor: pointer;
  padding: 8px 10px;
  background: transparent;
  color: rgba(247, 245, 239, 0.74);
  font-size: 13px;
  font-weight: 650;
}

.frame-bar button:hover, .player-showcase button:hover { color: #fff; }

.product-frame img, .player-showcase img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: contain;
  background: #0c0e12;
}

.hero-marquee {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 72px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.hero-marquee div {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 28px 18px;
  text-align: center;
}

.hero-marquee div + div { border-left: 1px solid var(--line); }
.hero-marquee strong { font-size: 26px; font-weight: 600; letter-spacing: -0.04em; }
.hero-marquee span { color: rgba(247, 245, 239, 0.54); font-size: 13px; }

.principles, .library {
  background: var(--paper);
  color: var(--ink);
}

.principles { padding: 154px 0 140px; }

.principles-heading, .split-heading {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: end;
}

.principles h2, .enrichment h2, .listening h2, .library h2, .appearance h2, .deployment h2 {
  font-size: clamp(42px, 4.4vw, 64px);
}

.principles-heading > p, .split-heading > p {
  max-width: 540px;
  margin: 0 0 5px;
  color: var(--muted-dark);
  font-size: 16px;
  line-height: 1.85;
}

.section-label {
  margin: 0 0 24px;
  color: var(--accent-deep);
  font-size: 13px;
  font-weight: 780;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-label-dark { color: #ff8487; }

.principle-list {
  margin-top: 100px;
  border-top: 1px solid var(--line-dark);
}

.principle {
  display: grid;
  grid-template-columns: 72px minmax(180px, 0.75fr) 1.25fr;
  gap: 28px;
  align-items: start;
  padding: 38px 0;
  border-bottom: 1px solid var(--line-dark);
}

.principle > span {
  color: var(--accent-deep);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 12px;
}

.principle h3 {
  margin: -5px 0 0;
  font-size: clamp(27px, 2.6vw, 36px);
  font-weight: 610;
  letter-spacing: -0.025em;
}

.principle p {
  max-width: 600px;
  margin: 0;
  color: var(--muted-dark);
  font-size: 16px;
  line-height: 1.8;
}

.enrichment {
  padding: 160px 0 136px;
  background: var(--black);
}

.enrichment-intro > p, .deployment-heading > p {
  color: rgba(247, 245, 239, 0.64);
}

.enrichment-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(320px, 0.7fr);
  gap: 64px;
  align-items: center;
  margin-top: 94px;
}

.product-frame-dark {
  border-color: rgba(255, 255, 255, 0.13);
  box-shadow: 0 50px 120px rgba(0, 0, 0, 0.42);
}

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

.enrichment-list article {
  padding: 28px 0 30px;
  border-bottom: 1px solid var(--line);
}

.enrichment-list span {
  color: #ff8487;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.enrichment-list h3 {
  margin: 10px 0 12px;
  font-size: 24px;
  font-weight: 590;
  letter-spacing: -0.02em;
}

.enrichment-list p {
  margin: 0;
  color: rgba(247, 245, 239, 0.62);
  font-size: 15px;
  line-height: 1.8;
}

.source-line, .capability-line {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 80px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.source-line span, .capability-line span {
  padding: 22px 14px;
  color: rgba(247, 245, 239, 0.6);
  font-size: 13px;
  text-align: center;
}

.source-line span + span, .capability-line span + span { border-left: 1px solid var(--line); }

.listening {
  position: relative;
  overflow: hidden;
  padding: 146px 0;
  background:
    radial-gradient(circle at 50% 62%, rgba(52, 81, 126, 0.34), transparent 42rem),
    linear-gradient(180deg, #111319, #090a0d 70%);
}

.listening-copy {
  position: relative;
  z-index: 2;
  max-width: 900px;
  margin-inline: auto;
  text-align: center;
}

.listening-copy p:last-child {
  max-width: 640px;
  margin: 30px auto 0;
  color: rgba(247, 245, 239, 0.64);
  font-size: 16px;
  line-height: 1.8;
}

.player-showcase { margin-top: 80px; }

.player-showcase figure {
  overflow: hidden;
  margin: 0;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 30px;
  background: #0b0d11;
  box-shadow: 0 60px 140px rgba(0, 0, 0, 0.55);
}

.player-showcase figcaption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  padding: 0 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
  color: rgba(247, 245, 239, 0.58);
  font-size: 13px;
}

.library { padding: 150px 0 140px; }

.library-gallery {
  display: grid;
  grid-template-columns: 1.18fr 0.82fr;
  gap: 24px;
  align-items: start;
  margin-top: 88px;
}

.library-gallery .product-frame:nth-child(2) { margin-top: 96px; }

.capability-line {
  grid-template-columns: repeat(6, 1fr);
  margin-top: 88px;
  border-color: var(--line-dark);
}

.capability-line span { color: var(--muted-dark); }
.capability-line span + span { border-color: var(--line-dark); }

.appearance {
  padding: 96px 0;
  background: var(--paper);
  color: var(--white);
}

.appearance-panel {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(420px, 1.1fr);
  gap: 72px;
  align-items: center;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 32px;
  background:
    radial-gradient(circle at 14% 20%, rgba(242, 97, 100, 0.17), transparent 25rem),
    linear-gradient(145deg, #17191f, #0c0e12 72%);
  box-shadow: 0 44px 100px rgba(16, 17, 20, 0.22);
  padding: 70px;
}

.appearance-copy > p:nth-of-type(2) {
  max-width: 540px;
  margin: 28px 0 0;
  color: rgba(247, 245, 239, 0.62);
  font-size: 15px;
  line-height: 1.82;
}

.app-download {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 34px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.055);
  padding: 14px 18px;
  transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.app-download:hover {
  transform: translateY(-2px);
  border-color: rgba(242, 97, 100, 0.5);
  background: rgba(242, 97, 100, 0.1);
}

.app-download span { font-size: 14px; font-weight: 720; }
.app-download small { color: rgba(247, 245, 239, 0.64); font-size: 13px; }

.appearance-modes {
  border-top: 1px solid rgba(255, 255, 255, 0.13);
}

.appearance-modes article {
  display: grid;
  grid-template-columns: 96px 150px 1fr;
  gap: 18px;
  align-items: baseline;
  padding: 25px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.13);
}

.appearance-modes article > span {
  color: #ff8487;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
}

.appearance-modes h3 {
  margin: 0;
  font-size: 21px;
  font-weight: 620;
  letter-spacing: -0.02em;
}

.appearance-modes p {
  margin: 0;
  color: rgba(247, 245, 239, 0.62);
  font-size: 14px;
  line-height: 1.72;
}

.developer-api {
  padding: 150px 0 142px;
  border-top: 1px solid rgba(16, 17, 20, 0.08);
  background: var(--paper);
  color: var(--ink);
}

.api-heading {
  display: grid;
  grid-template-columns: minmax(420px, 1.08fr) minmax(340px, 0.92fr);
  gap: 96px;
  align-items: end;
}

.api-heading h2 {
  margin-top: 18px;
  font-size: clamp(50px, 5vw, 72px);
}

.api-heading-copy > p {
  margin: 0;
  color: var(--muted-dark);
  font-size: 16px;
  line-height: 1.82;
}

.api-heading-copy code, .api-capabilities code {
  border-radius: 5px;
  background: rgba(16, 17, 20, 0.07);
  padding: 2px 5px;
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
}

.api-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.button-api-primary {
  background: var(--ink);
  color: var(--white);
  box-shadow: 0 16px 34px rgba(16, 17, 20, 0.14);
}

.button-api-primary:hover { background: #26282d; }

.button-api-secondary {
  border-color: rgba(16, 17, 20, 0.16);
  background: rgba(255, 255, 255, 0.35);
  color: var(--ink);
}

.button-api-secondary:hover {
  border-color: rgba(16, 17, 20, 0.3);
  background: rgba(255, 255, 255, 0.72);
}

.api-workbench {
  display: grid;
  grid-template-columns: minmax(300px, 0.78fr) minmax(500px, 1.22fr);
  gap: 72px;
  align-items: center;
  overflow: hidden;
  margin-top: 82px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 32px;
  background:
    radial-gradient(circle at 12% 14%, rgba(242, 97, 100, 0.14), transparent 24rem),
    linear-gradient(145deg, #17191f, #0b0d11 74%);
  box-shadow: 0 44px 100px rgba(16, 17, 20, 0.2);
  padding: 64px;
  color: var(--white);
}

.api-workbench-label {
  margin: 0 0 26px;
  color: #ff8588;
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.12em;
}

.api-flow ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.api-flow li {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.11);
}

.api-flow li:last-child { border-bottom: 1px solid rgba(255, 255, 255, 0.11); }

.api-flow li > span {
  padding-top: 2px;
  color: rgba(255, 132, 135, 0.86);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 11px;
}

.api-flow strong {
  display: block;
  color: rgba(247, 245, 239, 0.94);
  font-size: 16px;
  font-weight: 680;
}

.api-flow li p {
  margin: 7px 0 0;
  color: rgba(247, 245, 239, 0.62);
  font-size: 13px;
  line-height: 1.72;
}

.api-code-card {
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 18px;
  background: #0a0c0f;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.32);
}

.api-code-bar {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 19px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
  color: rgba(247, 245, 239, 0.48);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 10px;
  letter-spacing: 0.08em;
}

.api-code-card pre {
  margin: 0;
  overflow-x: auto;
  padding: 25px 23px;
}

.api-code-card code {
  color: #d2d6de;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  line-height: 1.72;
  white-space: pre;
}

.api-scopes {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  padding: 0 20px 20px;
}

.api-scopes span {
  border: 1px solid rgba(242, 97, 100, 0.22);
  border-radius: 999px;
  background: rgba(242, 97, 100, 0.07);
  padding: 7px 9px;
  color: rgba(255, 170, 172, 0.88);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 10px;
}

.api-capabilities {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 32px;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.api-capabilities article {
  padding: 34px 28px 36px;
}

.api-capabilities article + article { border-left: 1px solid var(--line-dark); }

.api-capabilities article > span {
  color: var(--accent-deep);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 11px;
}

.api-capabilities h3 {
  margin: 20px 0 0;
  font-size: 20px;
  font-weight: 680;
  letter-spacing: -0.02em;
}

.api-capabilities p {
  margin: 14px 0 0;
  color: var(--muted-dark);
  font-size: 13px;
  line-height: 1.76;
}

.deployment {
  padding: 160px 0 140px;
  background: #0c0e12;
}

.install-heading {
  max-width: 780px;
  text-align: center;
}

.install-heading h2 { margin-top: 18px; }

.install-heading > p:last-child {
  max-width: 680px;
  margin: 22px auto 0;
  color: rgba(247, 245, 239, 0.58);
  font-size: 16px;
  line-height: 1.75;
}

.install-notice {
  display: flex;
  align-items: flex-start;
  gap: 13px;
  margin-top: 54px;
  border: 1px solid rgba(224, 176, 97, 0.24);
  border-radius: 14px;
  background: rgba(224, 176, 97, 0.07);
  padding: 15px 18px;
  color: rgba(247, 245, 239, 0.66);
  font-size: 13px;
  line-height: 1.65;
}

.install-notice > span {
  display: grid;
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  place-items: center;
  margin-top: 1px;
  border: 1px solid rgba(224, 176, 97, 0.55);
  border-radius: 50%;
  color: #e0b061;
  font-family: Georgia, serif;
  font-size: 12px;
  font-style: italic;
}

.install-notice p { margin: 0; }
.install-notice strong { color: rgba(247, 245, 239, 0.88); }

.install-workbench {
  overflow: hidden;
  margin-top: 24px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: var(--radius);
  background: #111318;
  box-shadow: 0 50px 120px rgba(0, 0, 0, 0.36);
}

.install-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  padding: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  background: #0d0f13;
}

.install-tab {
  cursor: pointer;
  border: 1px solid transparent;
  border-radius: 14px;
  background: transparent;
  padding: 17px 18px 16px;
  color: rgba(247, 245, 239, 0.52);
  text-align: left;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.install-tab:hover {
  background: rgba(255, 255, 255, 0.035);
  color: rgba(247, 245, 239, 0.76);
}

.install-tab.is-active {
  border-color: rgba(224, 176, 97, 0.38);
  background: linear-gradient(135deg, rgba(224, 176, 97, 0.11), rgba(255, 255, 255, 0.035));
  color: var(--white);
}

.install-tab > span {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 15px;
  font-weight: 700;
}

.install-tab em {
  flex: 0 0 auto;
  border: 1px solid rgba(224, 176, 97, 0.32);
  border-radius: 999px;
  background: rgba(224, 176, 97, 0.1);
  padding: 3px 7px;
  color: #e0b061;
  font-size: 10px;
  font-style: normal;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.install-tab small {
  display: block;
  margin-top: 8px;
  color: rgba(247, 245, 239, 0.58);
  font-size: 13px;
}

.install-tab.is-active small { color: rgba(247, 245, 239, 0.7); }
.install-panel { padding: 32px; }
.install-panel[hidden] { display: none; }

.install-method-heading {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: 20px;
}

.install-method-heading > span {
  flex: 0 0 auto;
  color: #e0b061;
  font-size: 13px;
  font-weight: 700;
}

.install-method-heading p {
  margin: 0;
  color: rgba(247, 245, 239, 0.62);
  font-size: 14px;
}

.install-step {
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 15px;
  background: #0d0f13;
}

.install-step + .install-step { margin-top: 13px; }

.install-step-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 55px;
  gap: 16px;
  padding: 9px 13px 9px 17px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.install-step-title > div:first-child {
  display: flex;
  align-items: center;
  gap: 11px;
  color: rgba(247, 245, 239, 0.73);
  font-size: 13px;
  font-weight: 620;
}

.install-step-title b {
  color: rgba(224, 176, 97, 0.8);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 11px;
  font-weight: 650;
}

.install-step-actions {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 7px;
}

.install-step-title button, .install-step-title a {
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.04);
  padding: 8px 11px;
  color: rgba(247, 245, 239, 0.72);
  font-family: inherit;
  font-size: 12px;
  font-weight: 650;
  white-space: nowrap;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.install-step-title button:hover, .install-step-title a:hover {
  border-color: rgba(224, 176, 97, 0.42);
  background: rgba(224, 176, 97, 0.08);
  color: #fff;
}

.install-step pre {
  margin: 0;
  overflow: auto;
  padding: 19px 22px 22px;
  scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
}

.install-step-compose pre, .install-step-run pre { max-height: 540px; }

.install-step code, .install-access code {
  color: #c8ccd4;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  line-height: 1.72;
  white-space: pre;
}

.install-access {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 28px;
  margin-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
  padding: 22px 2px 2px;
}

.install-access > div {
  display: grid;
  gap: 7px;
}

.install-access span {
  color: rgba(247, 245, 239, 0.6);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.install-access code { color: #fff; font-size: 13px; }

.install-access p {
  margin: 0;
  color: rgba(247, 245, 239, 0.64);
  font-size: 13px;
  line-height: 1.72;
}

.install-access p code {
  color: rgba(247, 245, 239, 0.74);
  font-size: 0.96em;
  white-space: normal;
}

.closing {
  padding: 132px 0 126px;
  border-top: 1px solid rgba(16, 17, 20, 0.08);
  background:
    radial-gradient(circle at 72% 44%, rgba(242, 97, 100, 0.1), transparent 24rem),
    var(--paper);
  color: var(--ink);
}

.closing-layout {
  display: grid;
  grid-template-columns: minmax(220px, 0.7fr) minmax(390px, 1.15fr) minmax(180px, 0.55fr);
  gap: 64px;
  align-items: end;
}

.closing-identity > a {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  font-size: 18px;
  font-weight: 760;
  letter-spacing: -0.03em;
}

.closing-identity img { border-radius: 15px; }

.closing-identity > p {
  margin: 26px 0 0;
  color: var(--muted-dark);
  font-size: 14px;
  line-height: 1.75;
}

.closing-message > p {
  margin: 0 0 18px;
  color: #b83a40;
  font-size: 13px;
  font-weight: 760;
  letter-spacing: 0.1em;
}

.closing h2 { font-size: clamp(56px, 5.6vw, 78px); }
.closing h2 em { color: var(--accent-deep); font-style: normal; }

.closing-actions {
  display: grid;
  gap: 11px;
  width: 100%;
}

.closing-actions .button { width: 100%; }

.button-outline-dark {
  border-color: rgba(16, 17, 20, 0.16);
  background: rgba(255, 255, 255, 0.38);
  color: var(--ink);
}

.button-outline-dark:hover {
  border-color: rgba(16, 17, 20, 0.32);
  background: rgba(255, 255, 255, 0.7);
}

.site-footer {
  padding: 52px 0 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  background: var(--black);
  color: rgba(247, 245, 239, 0.64);
}

.footer-main {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 42px;
}

.footer-brand { color: rgba(247, 245, 239, 0.9); font-size: 16px; }

.footer-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  font-weight: 600;
}

.footer-nav a, .footer-app { transition: color 0.2s ease; }
.footer-nav a:hover, .footer-app:hover { color: var(--white); }

.footer-app {
  justify-self: end;
  border-bottom: 1px solid rgba(242, 97, 100, 0.5);
  padding-bottom: 3px;
  color: rgba(255, 158, 161, 0.9);
  font-size: 14px;
  font-weight: 680;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 42px;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
  padding-top: 24px;
  font-size: 12.5px;
  letter-spacing: 0.03em;
}

.footer-bottom p { margin: 0; }

.developer-page { background: var(--paper); }

.developer-hero {
  min-height: 760px;
  padding: 178px 0 118px;
  background:
    radial-gradient(circle at 72% 26%, rgba(242, 97, 100, 0.13), transparent 28rem),
    radial-gradient(circle at 12% 70%, rgba(74, 89, 160, 0.1), transparent 34rem),
    var(--black);
}

.developer-hero-grid {
  display: grid;
  grid-template-columns: minmax(500px, 1.2fr) minmax(320px, 0.8fr);
  gap: 90px;
  align-items: center;
}

.developer-hero h1 {
  margin: 0;
  font-size: clamp(58px, 6vw, 84px);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 1.04;
}

.developer-hero h1 em { color: var(--accent); font-style: normal; }

.developer-hero-copy > p:last-of-type {
  max-width: 680px;
  margin: 32px 0 0;
  color: rgba(247, 245, 239, 0.7);
  font-size: 17px;
  line-height: 1.78;
}

.developer-hero-actions {
  display: flex;
  gap: 11px;
  margin-top: 36px;
}

.developer-contract-card {
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.035);
  box-shadow: 0 36px 90px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(20px);
}

.developer-contract-card > div {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 18px;
  padding: 20px 22px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.developer-contract-card > div:last-child { border-bottom: 0; }

.developer-contract-card span {
  color: rgba(247, 245, 239, 0.44);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.09em;
}

.developer-contract-card code {
  color: rgba(247, 245, 239, 0.88);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
}

.developer-section { padding: 142px 0; }
.developer-quickstart, .developer-playback, .developer-security { background: var(--paper); color: var(--ink); }
.developer-scopes-section, .developer-reference { background: #0c0e12; color: var(--white); }

.developer-section-heading {
  display: grid;
  grid-template-columns: minmax(420px, 1fr) minmax(360px, 0.8fr);
  gap: 90px;
  align-items: end;
}

.developer-section-heading h2 {
  margin: 0;
  font-size: clamp(42px, 4.5vw, 64px);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.06;
}

.developer-section-heading > p {
  margin: 0 0 4px;
  color: var(--muted-dark);
  font-size: 16px;
  line-height: 1.82;
}

.developer-section-heading > p code, .developer-note code {
  border-radius: 5px;
  background: rgba(16, 17, 20, 0.07);
  padding: 2px 5px;
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
}

.developer-scopes-section .developer-section-heading > p,
.developer-reference .developer-section-heading > p { color: rgba(247, 245, 239, 0.64); }

.developer-scopes-section .developer-section-heading > p code,
.developer-reference .developer-section-heading > p code {
  background: rgba(255, 255, 255, 0.07);
  color: var(--white);
}

.developer-code-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 72px;
}

.developer-code-block {
  overflow: hidden;
  border: 1px solid rgba(16, 17, 20, 0.12);
  border-radius: 18px;
  background: #0d0f13;
  box-shadow: 0 28px 70px rgba(16, 17, 20, 0.12);
}

.developer-code-block header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  gap: 18px;
  padding: 10px 12px 10px 19px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
  color: rgba(247, 245, 239, 0.7);
  font-size: 13px;
  font-weight: 650;
}

.developer-code-block button {
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.04);
  padding: 8px 11px;
  color: rgba(247, 245, 239, 0.74);
  font-size: 12px;
  font-weight: 650;
}

.developer-code-block pre {
  min-height: 248px;
  margin: 0;
  overflow-x: auto;
  padding: 23px 22px 26px;
}

.developer-code-block code, .developer-error-card pre code {
  color: #cdd1d9;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.72;
  white-space: pre;
}

.developer-note {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 24px;
  margin-top: 20px;
  border: 1px solid rgba(16, 17, 20, 0.12);
  border-radius: 14px;
  padding: 20px 22px;
}

.developer-note strong { font-size: 14px; }
.developer-note p { margin: 0; color: var(--muted-dark); font-size: 13px; line-height: 1.72; }

.developer-scope-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin-top: 78px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.developer-scope-grid article { padding: 32px 22px 36px; }
.developer-scope-grid article + article { border-left: 1px solid var(--line); }

.developer-scope-grid article > code {
  color: #ff9295;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 10px;
}

.developer-scope-grid h3 { margin: 22px 0 0; font-size: 18px; font-weight: 680; }
.developer-scope-grid p { margin: 14px 0 0; color: rgba(247, 245, 239, 0.58); font-size: 13px; line-height: 1.76; }

.developer-flow-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 76px;
}

.developer-flow-grid article {
  min-height: 268px;
  border: 1px solid rgba(16, 17, 20, 0.12);
  border-radius: 17px;
  background: rgba(255, 255, 255, 0.32);
  padding: 27px;
}

.developer-flow-grid article > span {
  color: var(--accent-deep);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 11px;
}

.developer-flow-grid h3 { margin: 22px 0 18px; font-size: 21px; }

.developer-flow-grid code {
  display: block;
  overflow: hidden;
  margin-top: 7px;
  color: #45474d;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.developer-flow-grid p { margin: 20px 0 0; color: var(--muted-dark); font-size: 13px; line-height: 1.72; }

.developer-resource-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 76px;
}

.developer-resource-grid a {
  display: flex;
  min-height: 280px;
  flex-direction: column;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.035);
  padding: 28px;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.developer-resource-grid a:hover {
  transform: translateY(-3px);
  border-color: rgba(242, 97, 100, 0.42);
  background: rgba(242, 97, 100, 0.07);
}

.developer-resource-grid span { color: #ff888b; font-size: 10px; font-weight: 720; letter-spacing: 0.1em; }
.developer-resource-grid h3 { margin: 28px 0 0; font-size: 22px; }
.developer-resource-grid p { margin: 16px 0 0; color: rgba(247, 245, 239, 0.58); font-size: 13px; line-height: 1.76; }
.developer-resource-grid strong { margin-top: auto; padding-top: 24px; color: rgba(247, 245, 239, 0.9); font-size: 13px; }

.developer-error-card {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 64px;
  align-items: center;
  margin-top: 18px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 18px;
  background: #090b0e;
  padding: 42px;
}

.developer-error-card h3 { margin: 0; font-size: 25px; }
.developer-error-card p:not(.api-workbench-label) { margin: 16px 0 0; color: rgba(247, 245, 239, 0.58); font-size: 13px; line-height: 1.76; }
.developer-error-card p code { color: rgba(247, 245, 239, 0.84); font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; }
.developer-error-card pre { margin: 0; overflow-x: auto; }

.developer-security-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 54px;
  margin-top: 72px;
  padding: 0;
  border-top: 1px solid var(--line-dark);
  list-style: none;
}

.developer-security-list li {
  position: relative;
  border-bottom: 1px solid var(--line-dark);
  padding: 24px 18px 24px 32px;
  color: #4f5157;
  font-size: 14px;
  line-height: 1.72;
}

.developer-security-list li::before {
  position: absolute;
  top: 31px;
  left: 4px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-deep);
  content: "";
}

.screenshot-dialog {
  width: min(1500px, calc(100vw - 32px));
  max-height: calc(100vh - 32px);
  margin: auto;
  padding: 0;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 20px;
  background: #0d0f13;
  color: var(--white);
  box-shadow: 0 60px 180px rgba(0, 0, 0, 0.72);
}

.screenshot-dialog::backdrop {
  background: rgba(0, 0, 0, 0.84);
  backdrop-filter: blur(12px);
}

.dialog-bar {
  position: sticky;
  z-index: 2;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 54px;
  padding: 0 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(13, 15, 19, 0.94);
  color: rgba(247, 245, 239, 0.62);
  font-size: 12px;
}

.dialog-bar button {
  cursor: pointer;
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.08);
  padding: 8px 12px;
  font-size: 12px;
}

.screenshot-dialog > img {
  width: 100%;
  height: auto;
  max-height: calc(100vh - 88px);
  object-fit: contain;
}

.copy-toast {
  position: fixed;
  z-index: 1000;
  right: 24px;
  bottom: 24px;
  transform: translateY(20px);
  visibility: hidden;
  opacity: 0;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  background: rgba(20, 22, 27, 0.94);
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.35);
  padding: 13px 16px;
  color: var(--white);
  font-size: 12px;
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
}

.copy-toast.is-visible {
  transform: none;
  visibility: visible;
  opacity: 1;
}

.reveal {
  transform: translateY(20px);
  opacity: 0;
  transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.8s ease;
}

.reveal.is-visible { transform: none; opacity: 1; }

@media (max-width: 980px) {
  :root { --shell: min(100% - 40px, 760px); }
  .site-header { grid-template-columns: 1fr auto auto; }

  .menu-button {
    display: block;
    cursor: pointer;
    background: transparent;
    padding: 10px 12px;
    color: rgba(247, 245, 239, 0.66);
    font-size: 13px;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    overflow: hidden;
    padding: 8px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 16px;
    background: rgba(9, 10, 12, 0.96);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.42);
  }

  .site-nav[data-open="true"] { display: flex; }
  .site-nav a { padding: 14px 13px; border-radius: 10px; }
  .site-nav a:hover { background: rgba(255, 255, 255, 0.06); }
  .header-action { min-height: 40px; padding-inline: 14px; }
  .hero { padding-top: 150px; }
  .hero-stage { margin-top: 68px; }

  .principles-heading, .split-heading {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .enrichment-grid { grid-template-columns: 1fr; gap: 54px; }

  .enrichment-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-bottom: 1px solid var(--line);
  }

  .enrichment-list article { padding-right: 24px; border-bottom: 0; }
  .enrichment-list article + article { padding-left: 24px; border-left: 1px solid var(--line); }
  .library-gallery { grid-template-columns: 1fr; }
  .library-gallery .product-frame:nth-child(2) { margin-top: 0; }
  .capability-line { grid-template-columns: repeat(3, 1fr); }
  .capability-line span:nth-child(4) { border-left: 0; }
  .capability-line span:nth-child(n + 4) { border-top: 1px solid var(--line-dark); }
  .appearance-panel { grid-template-columns: 1fr; gap: 50px; padding: 54px; }

  .api-heading { grid-template-columns: 1fr; gap: 34px; }
  .api-heading-copy { max-width: 720px; }
  .api-workbench { grid-template-columns: 1fr; gap: 46px; }
  .api-capabilities { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .api-capabilities article:nth-child(3) { border-left: 0; }
  .api-capabilities article:nth-child(n + 3) { border-top: 1px solid var(--line-dark); }

  .developer-hero-grid, .developer-section-heading { grid-template-columns: 1fr; gap: 48px; }
  .developer-contract-card { max-width: 720px; }
  .developer-scope-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .developer-scope-grid article { border-top: 1px solid var(--line); }
  .developer-scope-grid article:nth-child(odd) { border-left: 0; }
  .developer-flow-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .developer-resource-grid { grid-template-columns: 1fr; }
  .developer-resource-grid a { min-height: 230px; }
  .developer-error-card { grid-template-columns: 1fr; gap: 34px; }

  .closing-layout {
    grid-template-columns: minmax(180px, 0.7fr) minmax(340px, 1.3fr);
    gap: 48px;
  }

  .closing-actions {
    grid-column: 2;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-main { grid-template-columns: 1fr auto; row-gap: 30px; }
  .footer-nav { grid-column: 1 / -1; grid-row: 2; }
  .footer-app { grid-column: 2; grid-row: 1; }
}

@media (max-width: 640px) {
  :root { --shell: calc(100vw - 32px); --radius: 17px; }
  html { scroll-padding-top: 82px; }

  .site-header {
    top: 10px;
    width: calc(100vw - 20px);
    height: 58px;
    padding-left: 12px;
    border-radius: 15px;
  }

  .brand { gap: 8px; font-size: 16px; }
  .brand img { width: 30px; height: 30px; }
  .header-actions { display: none; }
  .mobile-nav-app { display: block; color: rgba(255, 183, 185, 0.92); }
  .hero { padding: 128px 0 76px; }

  .overline {
    flex-direction: column;
    gap: 12px;
    margin-bottom: 28px;
  }

  .hero h1 { font-size: clamp(43px, 12vw, 48px); letter-spacing: -0.045em; }
  .hero-lead { margin-top: 26px; font-size: 16px; line-height: 1.75; }
  .hero-actions { flex-direction: column; margin-top: 30px; }
  .button { width: 100%; }
  .hero-facts { flex-direction: column; gap: 10px; margin-top: 24px; }
  .hero-stage { width: calc(100vw - 20px); margin-top: 54px; }
  .frame-bar { height: 46px; padding-inline: 13px; }

  .frame-bar span {
    max-width: 56%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .hero-marquee { grid-template-columns: repeat(2, 1fr); margin-top: 48px; }
  .hero-marquee div:nth-child(3) { border-top: 1px solid var(--line); border-left: 0; }
  .hero-marquee div:nth-child(4) { border-top: 1px solid var(--line); }
  .hero-marquee strong { font-size: 23px; }

  .principles, .enrichment, .listening, .library, .appearance, .developer-api, .deployment { padding: 100px 0 92px; }

  .principles h2, .enrichment h2, .listening h2, .library h2, .appearance h2, .developer-api h2, .deployment h2 {
    font-size: 40px;
  }

  .principles-heading > p, .split-heading > p {
    font-size: 15px;
    line-height: 1.75;
  }

  .principle-list { margin-top: 58px; }

  .principle {
    grid-template-columns: 42px 1fr;
    gap: 16px;
    padding: 30px 0;
  }

  .principle p { grid-column: 2; font-size: 15px; }
  .principle h3 { margin-top: -6px; font-size: 27px; }
  .enrichment-grid, .library-gallery { margin-top: 58px; }
  .enrichment-list { display: block; }
  .enrichment-list article { padding: 25px 0; }

  .enrichment-list article + article {
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .source-line, .capability-line { grid-template-columns: repeat(2, 1fr); margin-top: 54px; }
  .source-line span:nth-child(3), .capability-line span:nth-child(3), .capability-line span:nth-child(5) { border-left: 0; }
  .source-line span:nth-child(n + 3), .capability-line span:nth-child(n + 3) { border-top: 1px solid var(--line); }
  .capability-line span:nth-child(n + 3) { border-top-color: var(--line-dark); }
  .player-showcase { width: calc(100vw - 20px); margin-top: 54px; }
  .player-showcase figure { border-radius: 18px; }
  .player-showcase figcaption { height: 54px; padding-inline: 14px; }
  .appearance-panel { gap: 38px; border-radius: 20px; padding: 36px 22px 24px; }
  .appearance-copy > p:nth-of-type(2) { margin-top: 22px; font-size: 14px; }
  .app-download { width: 100%; margin-top: 28px; }

  .appearance-modes article {
    grid-template-columns: 68px 1fr;
    gap: 9px 14px;
    padding: 22px 0;
  }

  .appearance-modes article > span { padding-top: 4px; }
  .appearance-modes p { grid-column: 2; font-size: 13px; }
  .api-heading { gap: 26px; }
  .api-heading-copy > p { font-size: 15px; line-height: 1.75; }
  .api-links { flex-direction: column; margin-top: 26px; }
  .api-workbench { width: calc(100vw - 20px); gap: 38px; margin-top: 58px; border-radius: 20px; padding: 34px 22px 24px; }
  .api-flow li { grid-template-columns: 36px 1fr; gap: 12px; }
  .api-flow strong { font-size: 15px; }
  .api-flow li p { font-size: 13px; }
  .api-code-bar { align-items: flex-start; flex-direction: column; gap: 6px; padding: 14px 15px; }
  .api-code-card pre { padding: 20px 16px; }
  .api-code-card code { font-size: 12px; line-height: 1.68; }
  .api-scopes { padding: 0 15px 16px; }
  .api-capabilities { grid-template-columns: 1fr; margin-top: 24px; }
  .api-capabilities article { padding: 28px 4px 30px; }
  .api-capabilities article + article { border-top: 1px solid var(--line-dark); border-left: 0; }

  .developer-hero { min-height: auto; padding: 132px 0 88px; }
  .developer-hero-grid { gap: 54px; }
  .developer-hero h1 { font-size: 46px; }
  .developer-hero-copy > p:last-of-type { margin-top: 26px; font-size: 16px; }
  .developer-hero-actions { flex-direction: column; margin-top: 30px; }
  .developer-contract-card > div { grid-template-columns: 105px 1fr; padding: 18px 16px; }
  .developer-contract-card code { overflow: hidden; font-size: 12px; text-overflow: ellipsis; white-space: nowrap; }
  .developer-section { padding: 96px 0 88px; }
  .developer-section-heading { gap: 28px; }
  .developer-section-heading h2 { font-size: 38px; }
  .developer-section-heading > p { font-size: 15px; line-height: 1.76; }
  .developer-code-grid { grid-template-columns: 1fr; margin-top: 54px; }
  .developer-code-block { width: calc(100vw - 20px); margin-left: calc((100% - (100vw - 20px)) / 2); }
  .developer-code-block header { padding-left: 15px; font-size: 12px; }
  .developer-code-block pre { min-height: 0; padding: 20px 16px 22px; }
  .developer-code-block code, .developer-error-card pre code { font-size: 12px; }
  .developer-note { grid-template-columns: 1fr; gap: 10px; padding: 18px; }
  .developer-scope-grid, .developer-flow-grid, .developer-security-list { grid-template-columns: 1fr; }
  .developer-scope-grid article { border-top: 1px solid var(--line); border-left: 0; padding: 28px 4px 30px; }
  .developer-flow-grid { margin-top: 54px; }
  .developer-flow-grid article { min-height: 0; padding: 24px; }
  .developer-resource-grid { margin-top: 54px; }
  .developer-resource-grid a { min-height: 250px; padding: 24px; }
  .developer-error-card { padding: 28px 22px; }
  .developer-security-list { gap: 0; margin-top: 54px; }
  .install-heading h2 { font-size: 38px; }
  .install-heading > p:last-child { margin-top: 18px; font-size: 14px; }
  .install-notice { margin-top: 36px; padding: 14px; }
  .install-workbench { width: calc(100vw - 20px); }
  .install-tabs { gap: 6px; padding: 7px; }
  .install-tab { padding: 13px 12px; }
  .install-tab > span { gap: 6px; font-size: 14px; }
  .install-tab small { font-size: 12px; line-height: 1.5; }
  .install-panel { padding: 18px 10px 16px; }

  .install-method-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 7px;
    padding-inline: 4px;
  }

  .install-method-heading p { line-height: 1.6; }
  .install-step-title { min-height: 52px; padding-inline: 12px 9px; }
  .install-step-title > div:first-child { gap: 8px; font-size: 13px; }
  .install-step-actions { gap: 5px; }
  .install-step-title button, .install-step-title a { padding: 8px 9px; font-size: 12px; }
  .install-step pre { padding: 17px 15px 19px; }
  .install-step-compose pre, .install-step-run pre { max-height: 480px; }
  .install-step code { font-size: 12.5px; line-height: 1.7; }

  .install-access {
    grid-template-columns: 1fr;
    gap: 15px;
    padding: 19px 4px 3px;
  }

  .closing { padding: 96px 0 88px; }

  .closing-layout {
    grid-template-columns: 1fr;
    gap: 52px;
  }

  .closing-identity > p { margin-top: 20px; }
  .closing h2 { font-size: 52px; }

  .closing-actions {
    grid-column: auto;
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .site-footer { padding: 42px 0 24px; }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 30px;
    align-items: start;
  }

  .footer-nav {
    grid-column: auto;
    grid-row: auto;
    display: grid;
    grid-template-columns: repeat(3, auto);
    gap: 18px 28px;
    justify-content: start;
  }

  .footer-app {
    grid-column: auto;
    grid-row: auto;
    justify-self: start;
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
    margin-top: 34px;
    padding-top: 20px;
  }

  .screenshot-dialog {
    width: calc(100vw - 14px);
    max-height: calc(100vh - 14px);
    border-radius: 14px;
  }

  .copy-toast {
    right: 16px;
    bottom: 16px;
    left: 16px;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
  .reveal { transform: none; opacity: 1; }
}