:root {
  --ink: #102f40;
  --ink-deep: #082635;
  --paper: #f7f1e8;
  --paper-bright: #fffdf9;
  --mist: #e4eef1;
  --sky: #78c7e3;
  --sky-soft: #d9eef5;
  --coral: #ff7048;
  --coral-soft: #ffe0d5;
  --gold: #ffc857;
  --line: #a9c6d0;
  --muted: #5f7886;
  --success: #1d7a64;
  --shadow: 0 24px 70px rgb(8 38 53 / 14%);
  --radius: 28px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink-deep);
  background:
    radial-gradient(circle at 92% 8%, rgb(120 199 227 / 22%) 0 11rem, transparent 11.1rem),
    var(--paper);
  font-family: Aptos, "Segoe UI", Inter, system-ui, -apple-system, sans-serif;
  line-height: 1.58;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid var(--coral);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: white;
  background: var(--ink-deep);
  border-radius: 999px;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-shell {
  width: min(calc(100% - 40px), var(--max-width));
  margin: 0 auto;
}

.topbar {
  display: flex;
  min-height: 88px;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink-deep);
  font-weight: 850;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 11px;
}

.topbar__right,
.nav-links,
.language-links {
  display: flex;
  align-items: center;
}

.topbar__right {
  gap: 24px;
}

.nav-links {
  gap: 20px;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 720;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink-deep);
}

.language-links {
  padding: 4px;
  gap: 2px;
  background: rgb(255 255 255 / 68%);
  border: 1px solid rgb(16 47 64 / 12%);
  border-radius: 999px;
}

.language-links a {
  padding: 5px 9px;
  color: var(--muted);
  border-radius: 999px;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.72rem;
  font-weight: 800;
  text-decoration: none;
}

.language-links a[aria-current="true"] {
  color: white;
  background: var(--ink);
}

.hero {
  display: grid;
  min-height: 620px;
  padding: 44px 0 68px;
  align-items: center;
  grid-template-columns: minmax(0, 0.86fr) minmax(480px, 1.14fr);
  gap: 44px;
}

.eyebrow,
.section-kicker,
.mini-label,
.cover-stage__measure,
.example-card__mode,
.article-meta {
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.eyebrow,
.section-kicker {
  color: #23647f;
}

.hero h1,
.page-hero h1,
.section-heading,
.story-quote {
  margin: 0;
  font-family: "Arial Black", Aptos Display, "Segoe UI", sans-serif;
  font-weight: 900;
  letter-spacing: -0.065em;
  line-height: 0.98;
}

.hero h1 {
  max-width: 720px;
  margin-top: 20px;
  font-size: clamp(3.45rem, 5.4vw, 5.25rem);
}

.hero h1 span {
  color: var(--coral);
}

.hero h1 .hero-chunk--plain {
  color: inherit;
}

.hero__lead {
  max-width: 620px;
  margin: 22px 0 0;
  color: #3d5d6b;
  font-size: clamp(1.08rem, 1.5vw, 1.28rem);
}

.hero__actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  padding: 0 20px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

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

.button--primary {
  color: white;
  background: var(--ink);
  box-shadow: 0 12px 24px rgb(8 38 53 / 17%);
}

.button--primary:hover {
  background: #164e68;
}

.button--secondary {
  color: var(--ink);
  background: rgb(255 255 255 / 70%);
  border-color: rgb(16 47 64 / 14%);
}

.cover-stage {
  position: relative;
  padding: 28px;
  background: var(--ink-deep);
  border: 1px solid #24556c;
  border-radius: 34px;
  box-shadow: var(--shadow);
}

.cover-stage::before {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgb(120 199 227 / 6%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(120 199 227 / 6%) 1px, transparent 1px);
  background-size: 28px 28px;
  border-radius: inherit;
  content: "";
  pointer-events: none;
}

.cover-stage__measure {
  position: relative;
  display: flex;
  margin-bottom: 18px;
  justify-content: space-between;
  color: var(--sky);
  letter-spacing: 0.12em;
}

.crop-frame {
  position: relative;
  border: 2px solid var(--sky);
  background: white;
}

.crop-frame img {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.crop-handle {
  position: absolute;
  z-index: 2;
  width: 16px;
  height: 16px;
  background: var(--coral);
  border: 3px solid var(--ink-deep);
  border-radius: 50%;
}

.crop-handle:nth-of-type(1) { top: -9px; left: -9px; }
.crop-handle:nth-of-type(2) { top: -9px; right: -9px; }
.crop-handle:nth-of-type(3) { bottom: -9px; left: -9px; }
.crop-handle:nth-of-type(4) { right: -9px; bottom: -9px; }

.cover-stage__footer {
  position: relative;
  display: grid;
  margin-top: 20px;
  color: #c8dce4;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.cover-stage__footer div {
  padding: 11px 12px;
  background: rgb(255 255 255 / 6%);
  border: 1px solid rgb(120 199 227 / 16%);
  border-radius: 12px;
}

.cover-stage__footer strong,
.cover-stage__footer span {
  display: block;
}

.cover-stage__footer strong {
  color: white;
  font-size: 0.83rem;
}

.cover-stage__footer span {
  margin-top: 2px;
  color: #91afbc;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.66rem;
}

.proof-bar {
  display: grid;
  margin: 0 auto 52px;
  padding: 18px;
  background: rgb(255 255 255 / 66%);
  border: 1px solid rgb(16 47 64 / 12%);
  border-radius: 22px;
  box-shadow: 0 12px 40px rgb(8 38 53 / 6%);
  grid-template-columns: repeat(3, 1fr);
}

.proof-bar__item {
  padding: 10px 18px;
  border-right: 1px solid rgb(16 47 64 / 11%);
}

.proof-bar__item:last-child {
  border-right: 0;
}

.proof-bar strong,
.proof-bar span {
  display: block;
}

.proof-bar strong {
  font-size: 1rem;
}

.proof-bar span {
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.8rem;
}

.section {
  padding: 104px 0;
}

.section--ink {
  color: white;
  background: var(--ink-deep);
}

.section--white {
  background: var(--paper-bright);
}

.section--coral {
  background: var(--coral-soft);
}

.section--usecases {
  padding: 42px 0 108px;
}

.section-heading {
  max-width: 850px;
  margin-top: 18px;
  font-size: clamp(2.7rem, 5vw, 5.1rem);
}

.heading-chunk {
  display: inline-block;
}

.section-intro {
  max-width: 720px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 1.1rem;
}

.section--ink .section-intro {
  color: #b9cfd8;
}

.story-grid {
  display: grid;
  align-items: start;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.65fr);
  gap: 80px;
}

.story-quote {
  font-size: clamp(3rem, 5.7vw, 5.8rem);
}

.story-quote em {
  color: var(--coral);
  font-style: normal;
}

.story-copy {
  padding-top: 8px;
  color: #bad0d9;
}

.story-copy p {
  margin: 0 0 18px;
}

.usecase-header {
  display: grid;
  align-items: end;
  grid-template-columns: minmax(0, 1.3fr) minmax(280px, 0.7fr);
  gap: 64px;
}

.usecase-header .section-heading {
  max-width: 820px;
}

.usecase-header .section-intro {
  margin: 0 0 6px;
}

.use-grid {
  display: grid;
  margin-top: 46px;
  grid-template-columns: 1.18fr 1fr 1fr;
  gap: 18px;
}

.use-card {
  display: flex;
  min-height: 284px;
  padding: 30px;
  flex-direction: column;
  color: var(--ink-deep);
  background: rgb(255 255 255 / 76%);
  border: 1px solid rgb(16 47 64 / 12%);
  border-radius: 26px;
}

.use-card--primary {
  color: white;
  background: var(--ink-deep);
  border-color: var(--ink-deep);
}

.use-card--warm {
  background: var(--coral-soft);
  border-color: rgb(255 112 72 / 18%);
}

.use-card__label {
  color: #3b7085;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.7rem;
  font-weight: 850;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.use-card--primary .use-card__label {
  color: var(--sky);
}

.use-card h3 {
  margin: 22px 0 10px;
  font-size: 1.55rem;
  letter-spacing: -0.04em;
  line-height: 1.08;
}

.use-card p {
  margin: 0;
  color: var(--muted);
}

.use-card--primary p {
  color: #bad0d9;
}

.use-card a {
  margin-top: auto;
  padding-top: 24px;
  color: #14607b;
  font-size: 0.86rem;
  font-weight: 850;
  text-decoration: none;
}

.use-card--primary a {
  color: var(--sky);
}

.use-card a:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.mode-grid,
.step-grid,
.faq-grid,
.example-grid,
.policy-grid {
  display: grid;
  margin-top: 56px;
  gap: 20px;
}

.mode-grid {
  margin-top: 20px;
  grid-template-columns: repeat(3, 1fr);
}

.mode-choice-note {
  display: flex;
  margin-top: 42px;
  padding: 18px 20px;
  align-items: center;
  gap: 16px;
  color: white;
  background: var(--ink-deep);
  border-radius: 18px;
}

.mode-choice-note__label {
  flex: 0 0 auto;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.7rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.mode-choice-note__label {
  color: var(--sky);
}

.mode-choice-note strong {
  line-height: 1.35;
}

.mode-card,
.step-card,
.faq-card,
.policy-card {
  padding: 28px;
  background: rgb(255 255 255 / 76%);
  border: 1px solid rgb(16 47 64 / 12%);
  border-radius: 22px;
}

.mode-card__index,
.step-card__index {
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  color: white;
  background: var(--ink);
  border-radius: 50%;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.76rem;
  font-weight: 800;
}

.mode-card__condition {
  color: #3b7085;
  font-weight: 650;
}

.mode-card h3,
.step-card h3,
.faq-card h3,
.policy-card h2,
.example-card h2,
.guide-content h2,
.guide-content h3 {
  margin: 20px 0 8px;
  letter-spacing: -0.035em;
  line-height: 1.14;
}

.mode-card p,
.step-card p,
.faq-card p,
.policy-card p {
  margin: 0;
  color: var(--muted);
}

.step-grid {
  grid-template-columns: repeat(4, 1fr);
}

.step-card {
  min-height: 230px;
}

.showcase-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
}

.showcase-header .section-heading {
  max-width: 760px;
}

.cover-wall {
  display: grid;
  margin-top: 48px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.cover-tile {
  display: block;
  overflow: hidden;
  margin: 0;
  color: inherit;
  background: white;
  border: 1px solid rgb(16 47 64 / 12%);
  border-radius: 18px;
  box-shadow: 0 14px 38px rgb(8 38 53 / 8%);
  text-decoration: none;
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.cover-tile figure {
  margin: 0;
}

.cover-tile img {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  transition: transform 280ms ease;
}

.cover-tile:hover,
.cover-tile:focus-visible {
  border-color: rgb(20 96 123 / 34%);
  box-shadow: 0 18px 46px rgb(8 38 53 / 13%);
  transform: translateY(-2px);
}

.cover-tile:hover img,
.cover-tile:focus-visible img {
  transform: scale(1.012);
}

.cover-tile:focus-visible,
.example-card:focus-visible {
  outline: 3px solid var(--coral);
  outline-offset: 4px;
}

.cover-tile figcaption {
  display: flex;
  padding: 14px 16px;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: var(--muted);
  font-size: 0.82rem;
}

.cover-tile figcaption strong {
  color: var(--ink-deep);
}

.install-panel {
  display: grid;
  margin-top: 46px;
  padding: 28px;
  color: var(--ink-deep);
  background: var(--sky-soft);
  border: 1px solid rgb(16 47 64 / 10%);
  border-radius: 28px;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
}

.agent-message {
  margin: 0;
  padding: 18px 20px;
  color: var(--ink-deep);
  background: white;
  border: 1px solid rgb(16 47 64 / 12%);
  border-radius: 18px 18px 18px 6px;
  box-shadow: 0 8px 24px rgb(8 38 53 / 6%);
  font-size: 1rem;
  line-height: 1.5;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.copy-button {
  align-self: start;
  min-height: 44px;
  padding: 0 16px;
  color: white;
  background: var(--ink);
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  font-size: 0.86rem;
  font-weight: 850;
}

.install-note {
  margin: 18px 0 0;
  color: #416473;
  font-size: 0.88rem;
}

.faq-grid {
  grid-template-columns: repeat(2, 1fr);
}

.page-hero {
  padding: 90px 0 74px;
}

.page-hero h1 {
  max-width: 900px;
  margin-top: 22px;
  font-size: clamp(3.7rem, 7.5vw, 7rem);
}

.page-hero p {
  max-width: 760px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: 1.18rem;
}

.title-tail {
  display: inline-block;
}

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

.example-card {
  display: flex;
  overflow: hidden;
  color: inherit;
  background: var(--paper-bright);
  border: 1px solid rgb(16 47 64 / 12%);
  border-radius: 22px;
  box-shadow: 0 16px 44px rgb(8 38 53 / 7%);
  flex-direction: column;
  text-decoration: none;
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.example-card img {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  transition: transform 280ms ease;
}

.example-card:hover,
.example-card:focus-visible {
  border-color: rgb(20 96 123 / 34%);
  box-shadow: 0 20px 52px rgb(8 38 53 / 13%);
  transform: translateY(-3px);
}

.example-card:hover img,
.example-card:focus-visible img {
  transform: scale(1.012);
}

.example-card__body {
  padding: 24px;
}

.example-card__mode {
  color: #23708c;
}

.example-card h2 {
  margin-top: 10px;
  font-size: 1.55rem;
}

.example-card p {
  margin: 0;
  color: var(--muted);
}

.page-hero + .example-grid {
  margin-top: 8px;
}

.guide-layout {
  display: grid;
  padding-bottom: 110px;
  align-items: start;
  grid-template-columns: 260px minmax(0, 760px);
  gap: 72px;
}

.toc {
  position: sticky;
  top: 28px;
  padding: 22px;
  background: rgb(255 255 255 / 70%);
  border: 1px solid rgb(16 47 64 / 11%);
  border-radius: 18px;
}

.toc strong {
  display: block;
  margin-bottom: 12px;
}

.toc a {
  display: block;
  padding: 7px 0;
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}

.toc a:hover {
  color: var(--ink-deep);
}

.guide-content {
  min-width: 0;
}

.guide-content h2 {
  padding-top: 34px;
  font-size: 2.2rem;
}

.guide-content h2:first-child {
  padding-top: 0;
}

.guide-content h3 {
  margin-top: 30px;
  font-size: 1.35rem;
}

.guide-content p,
.guide-content li {
  color: #3f5e6c;
}

.guide-content li + li {
  margin-top: 8px;
}

.guide-content code {
  padding: 0.12em 0.35em;
  color: var(--ink-deep);
  background: var(--sky-soft);
  border-radius: 5px;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.9em;
}

.guide-callout {
  margin: 30px 0;
  padding: 22px 24px;
  background: var(--coral-soft);
  border-left: 5px solid var(--coral);
  border-radius: 0 16px 16px 0;
}

.guide-callout strong,
.guide-callout p {
  margin: 0;
}

.guide-callout p {
  margin-top: 6px;
}

.article-meta {
  margin-top: 24px;
  color: var(--muted);
  letter-spacing: 0.08em;
}

.policy-grid {
  grid-template-columns: minmax(0, 760px);
  padding-bottom: 110px;
}

.policy-card h2:first-child {
  margin-top: 0;
}

.site-footer {
  padding: 52px 0;
  color: #adc6d0;
  background: var(--ink-deep);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 48px;
}

.site-footer .brand {
  color: white;
}

.site-footer p {
  max-width: 570px;
  margin: 14px 0 0;
  color: #8eabb8;
  font-size: 0.88rem;
}

.footer-links {
  display: grid;
  align-content: start;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 26px;
}

.footer-links a {
  color: #c7d9df;
  font-size: 0.88rem;
  text-decoration: none;
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  display: flex;
  margin-top: 38px;
  padding-top: 24px;
  justify-content: space-between;
  gap: 20px;
  color: #7696a4;
  border-top: 1px solid rgb(255 255 255 / 10%);
  font-size: 0.78rem;
}

.footer-bottom a {
  color: inherit;
  font-weight: 800;
  text-underline-offset: 3px;
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero__copy {
    max-width: 760px;
  }

  .story-grid,
  .usecase-header,
  .guide-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .toc {
    position: static;
  }

  .use-grid,
  .mode-grid,
  .step-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .use-card--primary {
    grid-column: 1 / -1;
  }

  .mode-choice-note {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 720px) {
  .site-shell {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .topbar {
    min-height: 74px;
  }

  .nav-links {
    display: none;
  }

  .topbar__right {
    gap: 10px;
  }

  .hero {
    min-height: auto;
    padding: 54px 0 64px;
    gap: 44px;
  }

  .hero h1,
  .page-hero h1 {
    font-size: clamp(3.2rem, 16vw, 4.6rem);
  }

  html[lang="zh-CN"] .hero h1 {
    font-size: 2.35rem;
  }

  html[lang="zh-CN"] .hero h1 .hero-chunk {
    display: inline-block;
  }

  .cover-stage {
    padding: 18px;
    border-radius: 22px;
  }

  .cover-stage__footer {
    grid-template-columns: 1fr;
  }

  .proof-bar,
  .use-grid,
  .mode-grid,
  .step-grid,
  .cover-wall,
  .faq-grid,
  .example-grid,
  .site-footer__grid {
    grid-template-columns: 1fr;
  }

  .proof-bar__item {
    border-right: 0;
    border-bottom: 1px solid rgb(16 47 64 / 11%);
  }

  .proof-bar__item:last-child {
    border-bottom: 0;
  }

  .section {
    padding: 76px 0;
  }

  .showcase-header,
  .footer-bottom {
    align-items: start;
    flex-direction: column;
  }

  .showcase-header {
    display: block;
  }

  .showcase-header .button {
    margin-top: 24px;
  }

  .install-panel {
    grid-template-columns: 1fr;
  }

  .copy-button {
    justify-self: start;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}