:root {
  color-scheme: light;
  --paper: #f5f4ed;
  --surface: #fbfaf5;
  --surface-strong: #ffffff;
  --ink: #15231f;
  --muted: #64706b;
  --faint: #88928d;
  --line: #d9ddd3;
  --line-strong: #c3cabd;
  --pine: #254f42;
  --pine-deep: #173a30;
  --pine-soft: #e4ebe5;
  --gold: #aa7922;
  --gold-soft: #f3ead7;
  --shadow-sm: 0 1px 2px rgb(24 42 35 / 5%), 0 8px 24px rgb(24 42 35 / 4%);
  --shadow-lg: 0 24px 80px rgb(23 58 48 / 12%);
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --shell: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "Noto Sans SC", "Hiragino Sans", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

button,
summary {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  color: inherit;
}

svg {
  width: 1.2em;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.shell {
  width: min(var(--shell), calc(100% - 48px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: white;
  background: var(--pine-deep);
  transform: translateY(-160%);
  transition: transform 160ms ease;
}

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

:focus-visible {
  outline: 3px solid rgb(37 79 66 / 30%);
  outline-offset: 3px;
}

.site-header {
  position: sticky;
  z-index: 30;
  top: 0;
  border-bottom: 1px solid rgb(217 221 211 / 85%);
  background: rgb(245 244 237 / 92%);
  backdrop-filter: blur(18px);
}

.header-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 74px;
}

.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  width: max-content;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border: 1px solid rgb(255 255 255 / 22%);
  border-radius: 11px;
  color: white;
  background: var(--pine);
  box-shadow: inset 0 0 0 2px rgb(255 255 255 / 12%);
  font-family: Georgia, "Noto Serif TC", "Noto Serif SC", serif;
  font-size: 22px;
  font-weight: 700;
}

.brand-name {
  display: grid;
  line-height: 1.15;
}

.brand-name strong {
  font-family: Georgia, "Noto Serif TC", "Noto Serif SC", serif;
  font-size: 21px;
  letter-spacing: .015em;
}

.brand-name small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: .08em;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 30px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
}

.desktop-nav a,
.source-link,
.footer-links a {
  transition: color 150ms ease;
}

.desktop-nav a:hover,
.source-link:hover,
.footer-links a:hover {
  color: var(--pine);
}

.header-actions {
  display: flex;
  justify-self: end;
  align-items: center;
  gap: 16px;
}

.source-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
}

.language-menu {
  position: relative;
}

.language-menu summary {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  cursor: pointer;
  list-style: none;
  font-size: 14px;
  font-weight: 600;
}

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

.language-menu summary svg {
  width: 17px;
}

.language-menu .chevron {
  width: 14px;
  transition: transform 150ms ease;
}

.language-menu[open] .chevron {
  transform: rotate(180deg);
}

.language-menu__items {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  display: grid;
  width: 174px;
  padding: 7px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-strong);
  box-shadow: var(--shadow-lg);
}

.language-menu__items a {
  padding: 9px 11px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 14px;
}

.language-menu__items a:hover,
.language-menu__items a[aria-current="page"] {
  color: var(--pine-deep);
  background: var(--pine-soft);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 104px 0 0;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 82% 16%, rgb(216 228 217 / 75%), transparent 31%),
    linear-gradient(180deg, #faf9f4 0%, var(--paper) 78%);
}

.hero-orbit {
  position: absolute;
  border: 1px solid rgb(37 79 66 / 9%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-orbit--one {
  top: -230px;
  right: -80px;
  width: 650px;
  height: 650px;
}

.hero-orbit--two {
  top: -125px;
  right: 23px;
  width: 440px;
  height: 440px;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(380px, .8fr);
  align-items: center;
  gap: clamp(48px, 8vw, 110px);
}

.hero-copy {
  max-width: 670px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--gold);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.hero h1,
.section-heading h2,
.connect-copy h2,
.relationship h2 {
  margin: 0;
  font-family: Georgia, "Noto Serif TC", "Noto Serif SC", "Hiragino Mincho ProN", serif;
  font-weight: 600;
  letter-spacing: -.035em;
}

.hero h1 {
  max-width: 650px;
  font-size: clamp(48px, 6vw, 78px);
  line-height: 1.08;
}

.hero-lede {
  max-width: 610px;
  margin: 26px 0 0;
  color: var(--muted);
  font-size: 19px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 13px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 750;
  transition: transform 150ms ease, box-shadow 150ms ease, background 150ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button--primary {
  color: white;
  background: var(--pine);
  box-shadow: 0 10px 28px rgb(37 79 66 / 18%);
}

.button--primary:hover {
  background: var(--pine-deep);
  box-shadow: 0 14px 34px rgb(37 79 66 / 24%);
}

.button--secondary {
  border-color: var(--line-strong);
  background: rgb(255 255 255 / 60%);
}

.button--secondary:hover {
  background: white;
}

.button--light {
  color: var(--pine-deep);
  background: white;
}

.button--wide {
  width: 100%;
}

.button svg {
  width: 18px;
}

.hero-note {
  margin: 15px 0 0;
  color: var(--faint);
  font-size: 13px;
}

.endpoint-panel {
  position: relative;
  border: 1px solid rgb(195 202 189 / 90%);
  border-radius: var(--radius-lg);
  background: rgb(251 250 245 / 88%);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(14px);
  transform: rotate(.5deg);
}

.endpoint-panel::before {
  position: absolute;
  z-index: -1;
  inset: 18px -18px -18px 18px;
  border: 1px solid rgb(170 121 34 / 16%);
  border-radius: var(--radius-lg);
  content: "";
}

.endpoint-panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
}

.endpoint-panel__head span:first-child {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.endpoint-panel__head i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #2b8a57;
  box-shadow: 0 0 0 4px rgb(43 138 87 / 12%);
}

.endpoint-panel__body {
  padding: 26px;
}

.endpoint-label,
.connect-card__label {
  margin: 0 0 8px;
  color: var(--faint);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.endpoint-value {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  min-height: 56px;
  padding: 0 15px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: white;
  cursor: pointer;
  text-align: left;
}

.endpoint-value code,
.connect-card code {
  overflow-wrap: anywhere;
  color: var(--pine-deep);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
}

.endpoint-value svg {
  flex: 0 0 auto;
  width: 18px;
  color: var(--muted);
}

.endpoint-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 8px;
  margin: 24px 0;
  color: var(--faint);
  text-align: center;
  font-size: 12px;
}

.endpoint-flow span {
  padding: 9px 6px;
  border-radius: 8px;
  background: var(--pine-soft);
}

.endpoint-flow span:nth-of-type(2) {
  color: white;
  background: var(--pine);
  font-weight: 700;
}

.endpoint-checks {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  color: var(--muted);
  font-size: 13px;
  list-style: none;
}

.endpoint-checks li {
  display: flex;
  align-items: center;
  gap: 9px;
}

.endpoint-checks span {
  display: grid;
  width: 19px;
  height: 19px;
  place-items: center;
  border-radius: 50%;
  color: var(--pine);
  background: var(--pine-soft);
  font-size: 11px;
  font-weight: 900;
}

.stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 100px;
  border: solid var(--line);
  border-width: 1px 1px 0;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  background: rgb(251 250 245 / 75%);
}

.stat {
  display: grid;
  gap: 2px;
  padding: 22px 26px;
}

.stat + .stat {
  border-left: 1px solid var(--line);
}

.stat strong {
  font-family: Georgia, serif;
  font-size: 28px;
  font-weight: 600;
}

.stat span {
  color: var(--muted);
  font-size: 13px;
}

.section {
  padding: 110px 0;
}

.section--tinted {
  border-block: 1px solid var(--line);
  background: #efefe8;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 44px;
}

.section-heading--split {
  display: grid;
  grid-template-columns: 1fr minmax(320px, .8fr);
  align-items: end;
  gap: 80px;
  max-width: none;
}

.section-heading h2,
.connect-copy h2,
.relationship h2 {
  font-size: clamp(34px, 4vw, 52px);
  line-height: 1.18;
}

.section-heading > p:last-child,
.section-heading--split > p,
.connect-copy > p,
.relationship p {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: solid var(--line);
  border-width: 1px 0;
}

.principle-card {
  position: relative;
  padding: 36px 32px 38px 0;
}

.principle-card + .principle-card {
  padding-left: 32px;
  border-left: 1px solid var(--line);
}

.principle-card__index {
  color: var(--gold);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  font-weight: 800;
}

.principle-card h3,
.capability-card h3,
.prompt-panel h3 {
  margin: 20px 0 10px;
  font-family: Georgia, "Noto Serif TC", "Noto Serif SC", serif;
  font-size: 23px;
  line-height: 1.3;
}

.principle-card p,
.capability-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.capability-card {
  min-height: 250px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.capability-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.capability-card__mark {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 12px;
  color: var(--gold);
  background: var(--gold-soft);
  font-family: Georgia, "Noto Serif TC", "Noto Serif SC", serif;
  font-size: 22px;
  font-weight: 700;
}

.capability-card__count {
  color: var(--faint);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
}

.calendar-note {
  margin-top: 20px;
  color: var(--muted);
  font-size: 14px;
}

.calendar-note span {
  margin-right: 8px;
  color: var(--gold);
  font-weight: 800;
}

.connect-grid {
  display: grid;
  grid-template-columns: 1.15fr minmax(340px, .7fr);
  align-items: start;
  gap: clamp(60px, 10vw, 130px);
}

.connect-copy {
  max-width: 680px;
}

.steps {
  display: grid;
  gap: 0;
  margin: 38px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.steps li {
  display: grid;
  grid-template-columns: 34px 1fr;
  align-items: start;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.steps span {
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border-radius: 50%;
  color: white;
  background: var(--pine);
  font-size: 12px;
  font-weight: 800;
}

.steps p {
  margin: 1px 0 0;
  color: var(--ink);
  font-size: 15px;
}

.connect-card {
  position: sticky;
  top: 110px;
  display: grid;
  gap: 16px;
  padding: 30px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: var(--surface-strong);
  box-shadow: var(--shadow-lg);
}

.connect-card code {
  display: block;
  padding: 15px;
  border-radius: 11px;
  background: var(--paper);
}

.connect-card p {
  margin: 0;
  color: var(--faint);
  text-align: center;
  font-size: 12px;
}

.prompt-panel {
  display: grid;
  grid-template-columns: minmax(220px, .45fr) 1fr;
  gap: 56px;
  margin-top: 76px;
  padding: 36px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--gold-soft);
}

.prompt-panel h3 {
  margin: 0;
  font-size: 26px;
}

.prompt-panel ul {
  display: grid;
  gap: 13px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.prompt-panel li {
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 8px;
  font-size: 14px;
}

.prompt-panel li > span:first-child {
  color: var(--gold);
  font-weight: 800;
}

.relationship {
  color: white;
  background: var(--pine-deep);
}

.relationship-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 70px;
  min-height: 330px;
  padding-block: 70px;
}

.relationship p {
  max-width: 720px;
  color: rgb(255 255 255 / 68%);
}

.eyebrow--light {
  color: #e2bd73;
}

.site-footer {
  color: var(--muted);
  background: #102c24;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  min-height: 140px;
  border-top: 1px solid rgb(255 255 255 / 10%);
}

.footer-brand strong {
  color: white;
  font-family: Georgia, serif;
  font-size: 19px;
}

.footer-brand p {
  margin: 1px 0 0;
  font-size: 12px;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13px;
}

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

.copy-status {
  position: fixed;
  z-index: 60;
  right: 22px;
  bottom: 22px;
  max-width: min(360px, calc(100vw - 44px));
  margin: 0;
  padding: 11px 15px;
  border-radius: 11px;
  color: white;
  background: var(--pine-deep);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 160ms ease, transform 160ms ease;
  font-size: 14px;
}

.copy-status[data-visible="true"] {
  opacity: 1;
  transform: translateY(0);
}

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

  .desktop-nav {
    display: none;
  }

  .hero {
    padding-top: 76px;
  }

  .hero-grid,
  .connect-grid {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    gap: 64px;
  }

  .endpoint-panel {
    width: min(620px, calc(100% - 16px));
    transform: none;
  }

  .stats {
    margin-top: 80px;
  }

  .section-heading--split {
    grid-template-columns: 1fr;
    gap: 12px;
  }

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

  .connect-card {
    position: static;
    max-width: 620px;
  }
}

@media (max-width: 700px) {
  .shell {
    width: min(100% - 32px, var(--shell));
  }

  .site-header {
    position: relative;
  }

  .header-inner {
    min-height: 66px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
    font-size: 19px;
  }

  .brand-name small,
  .source-link {
    display: none;
  }

  .language-menu summary span {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
  }

  .language-menu summary {
    width: 42px;
    justify-content: center;
    padding: 0;
  }

  .language-menu .chevron {
    display: none;
  }

  .hero {
    padding-top: 60px;
  }

  .hero h1 {
    font-size: clamp(42px, 13vw, 58px);
  }

  .hero-lede {
    font-size: 17px;
  }

  .hero-actions {
    display: grid;
  }

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

  .endpoint-panel {
    width: calc(100% - 10px);
  }

  .endpoint-panel::before {
    inset: 10px -10px -10px 10px;
  }

  .endpoint-panel__body {
    padding: 20px;
  }

  .endpoint-flow {
    gap: 4px;
    font-size: 10px;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
    margin-top: 68px;
  }

  .stat {
    padding: 18px;
  }

  .stat:nth-child(3) {
    border-left: 0;
  }

  .stat:nth-child(n + 3) {
    border-top: 1px solid var(--line);
  }

  .section {
    padding: 78px 0;
  }

  .section-heading {
    margin-bottom: 30px;
  }

  .principle-grid,
  .capability-grid {
    grid-template-columns: 1fr;
  }

  .principle-card,
  .principle-card + .principle-card {
    padding: 28px 0;
    border-left: 0;
  }

  .principle-card + .principle-card {
    border-top: 1px solid var(--line);
  }

  .capability-card {
    min-height: auto;
  }

  .prompt-panel {
    grid-template-columns: 1fr;
    gap: 24px;
    margin-top: 56px;
    padding: 25px;
  }

  .relationship-inner {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .relationship .button {
    width: 100%;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    padding-block: 38px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}