:root {
  --ink: #111d19;
  --ink-soft: #33443d;
  --paper: #f3f0e7;
  --paper-strong: #fffdf7;
  --line: rgba(17, 29, 25, 0.14);
  --acid: #e9f66f;
  --coral: #ff6b4a;
  --mint: #92d7b8;
  --blue: #a8c7fa;
  --shadow: 0 24px 80px rgba(17, 29, 25, 0.11);
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

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

html[data-lang="en"] .lang-zh,
html[data-lang="zh"] .lang-en {
  display: none !important;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 7% 3%, rgba(233, 246, 111, 0.38), transparent 24rem),
    radial-gradient(circle at 97% 26%, rgba(168, 199, 250, 0.28), transparent 31rem),
    var(--paper);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

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

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  transform: translateY(-150%);
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--ink);
  color: white;
}

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

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid rgba(17, 29, 25, 0.1);
  background: rgba(243, 240, 231, 0.86);
  backdrop-filter: blur(18px);
}

.header-inner {
  width: min(calc(100% - 40px), var(--max));
  height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.brand img {
  width: 36px;
  height: 36px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 25px;
  margin-left: auto;
}

.site-nav a {
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}

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

.language-switch {
  display: flex;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.48);
}

.language-switch button {
  min-width: 42px;
  border: 0;
  border-radius: 999px;
  padding: 6px 9px;
  color: var(--ink-soft);
  background: transparent;
  cursor: pointer;
  font: inherit;
  font-size: 0.75rem;
  font-weight: 800;
}

.language-switch button[aria-pressed="true"] {
  color: white;
  background: var(--ink);
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--ink);
  border-radius: 999px;
}

.github-link svg {
  width: 16px;
  height: 16px;
}

.menu-button {
  display: none;
  margin-left: auto;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 12px;
  background: var(--paper-strong);
  color: var(--ink);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 800;
}

main {
  overflow: hidden;
}

.hero,
.section,
.footer-inner {
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

.hero {
  min-height: 700px;
  padding: 105px 0 90px;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(380px, 0.92fr);
  align-items: center;
  gap: clamp(48px, 7vw, 96px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 22px;
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 5px rgba(255, 107, 74, 0.13);
  content: "";
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 25px;
  font-size: clamp(3.25rem, 7vw, 6.65rem);
  line-height: 0.93;
  letter-spacing: -0.075em;
}

h1 em {
  position: relative;
  z-index: 0;
  display: inline-block;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
}

.hero-copy h1.lang-zh {
  font-size: clamp(3.15rem, 5.9vw, 5.7rem);
  line-height: 1.02;
  letter-spacing: -0.06em;
}

h1 em::after {
  position: absolute;
  z-index: -1;
  right: -0.05em;
  bottom: 0.05em;
  left: 0;
  height: 0.28em;
  border-radius: 999px;
  background: var(--acid);
  content: "";
  transform: rotate(-1.5deg);
}

.hero-copy > p {
  max-width: 630px;
  margin-bottom: 31px;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 1.8vw, 1.24rem);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  padding: 12px 20px;
  font-size: 0.9rem;
  font-weight: 850;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

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

.button-primary {
  color: white;
  background: var(--ink);
  box-shadow: 0 8px 24px rgba(17, 29, 25, 0.18);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.4);
}

.hero-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 9px 20px;
  margin-top: 25px;
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 750;
}

.hero-notes span::before {
  margin-right: 7px;
  color: #287558;
  content: "●";
}

.receipt-wrap {
  position: relative;
  padding: 20px;
}

.receipt-wrap::before {
  position: absolute;
  inset: -9% -7% 15% 12%;
  border-radius: 48% 52% 40% 60%;
  background: var(--blue);
  content: "";
  filter: blur(0.2px);
  transform: rotate(4deg);
}

.receipt {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 24px;
  color: #eff5f0;
  background: #111d19;
  box-shadow: 0 36px 90px rgba(17, 29, 25, 0.28);
  transform: rotate(-1.8deg);
}

.receipt-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 17px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(239, 245, 240, 0.72);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.live-dot {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--acid);
}

.live-dot::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 4px rgba(233, 246, 111, 0.1);
  content: "";
}

.receipt-body {
  padding: 24px;
}

.machine-name {
  margin-bottom: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1.28rem;
  font-weight: 800;
}

.machine-meta {
  margin-bottom: 26px;
  color: rgba(239, 245, 240, 0.54);
  font-size: 0.78rem;
}

.execution-list {
  position: relative;
  display: grid;
  gap: 3px;
}

.execution-list::before {
  position: absolute;
  top: 17px;
  bottom: 17px;
  left: 12px;
  width: 1px;
  background: rgba(255, 255, 255, 0.15);
  content: "";
}

.execution-row {
  position: relative;
  display: grid;
  grid-template-columns: 25px 1fr auto;
  align-items: center;
  gap: 12px;
  min-height: 52px;
  font-size: 0.82rem;
}

.execution-check {
  z-index: 1;
  display: grid;
  width: 25px;
  height: 25px;
  place-items: center;
  border: 3px solid #111d19;
  border-radius: 50%;
  color: var(--ink);
  background: var(--acid);
  font-size: 0.66rem;
  font-weight: 950;
}

.execution-row strong {
  display: block;
}

.execution-row small {
  display: block;
  color: rgba(239, 245, 240, 0.5);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.execution-time {
  color: rgba(239, 245, 240, 0.5);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.7rem;
}

.receipt-footer {
  display: flex;
  justify-content: space-between;
  margin: 25px -24px -24px;
  padding: 16px 24px;
  color: var(--ink);
  background: var(--acid);
  font-size: 0.78rem;
  font-weight: 900;
}

.section {
  padding: 105px 0;
}

.section-kicker {
  margin-bottom: 13px;
  color: #287558;
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.section-heading {
  display: grid;
  grid-template-columns: 1fr 0.72fr;
  gap: 70px;
  align-items: end;
  margin-bottom: 55px;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(2.35rem, 5vw, 4.75rem);
  line-height: 1;
  letter-spacing: -0.06em;
}

.section-heading p {
  margin-bottom: 3px;
  color: var(--ink-soft);
  font-size: 1rem;
}

.problem-band {
  width: 100%;
  color: #f7f4eb;
  background: var(--ink);
}

.problem-band .section {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(50px, 10vw, 135px);
  align-items: center;
}

.problem-band .section-kicker {
  color: var(--acid);
}

.problem-band h2 {
  margin-bottom: 24px;
}

.problem-band p {
  color: rgba(247, 244, 235, 0.66);
}

.problem-quote {
  position: relative;
  margin: 0;
  padding: 38px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.045);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.55rem, 3vw, 2.55rem);
  line-height: 1.22;
  letter-spacing: -0.025em;
}

.problem-quote::before {
  position: absolute;
  top: -32px;
  left: 20px;
  color: var(--coral);
  content: "“";
  font-size: 6rem;
  line-height: 1;
}

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

.flow-card {
  position: relative;
  padding: 30px 28px 34px 0;
}

.flow-card + .flow-card {
  padding-left: 28px;
  border-left: 1px solid var(--line);
}

.flow-number {
  display: grid;
  width: 35px;
  height: 35px;
  margin-bottom: 42px;
  place-items: center;
  border-radius: 50%;
  color: white;
  background: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  font-weight: 900;
}

.flow-card h3 {
  margin-bottom: 11px;
  font-size: 1.16rem;
  letter-spacing: -0.025em;
}

.flow-card p {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.capabilities {
  background: rgba(255, 253, 247, 0.64);
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
}

.capability-card {
  min-height: 295px;
  padding: 29px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--paper-strong);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.capability-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.capability-icon {
  display: grid;
  width: 46px;
  height: 46px;
  margin-bottom: 53px;
  place-items: center;
  border-radius: 13px;
  background: var(--acid);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  font-weight: 950;
}

.capability-card:nth-child(2) .capability-icon,
.capability-card:nth-child(5) .capability-icon {
  background: var(--blue);
}

.capability-card:nth-child(3) .capability-icon,
.capability-card:nth-child(6) .capability-icon {
  background: #ffc4b6;
}

.capability-card h3 {
  margin-bottom: 10px;
  font-size: 1.2rem;
  letter-spacing: -0.03em;
}

.capability-card p {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.architecture-shell {
  display: grid;
  grid-template-columns: 1fr 0.82fr;
  gap: 16px;
}

.architecture-map,
.principles-panel {
  border-radius: 24px;
}

.architecture-map {
  position: relative;
  overflow: hidden;
  min-height: 515px;
  padding: 38px;
  color: white;
  background: var(--ink);
}

.architecture-map::after {
  position: absolute;
  right: -100px;
  bottom: -150px;
  width: 350px;
  height: 350px;
  border: 90px solid rgba(233, 246, 111, 0.08);
  border-radius: 50%;
  content: "";
}

.map-label {
  margin-bottom: 40px;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.map-flow {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 0.65fr 42px 1fr 42px 0.75fr;
  align-items: center;
  gap: 8px;
}

.map-node {
  min-height: 128px;
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.055);
}

.map-node--hub {
  min-height: 218px;
  border-color: rgba(233, 246, 111, 0.5);
  background: rgba(233, 246, 111, 0.09);
}

.map-node strong {
  display: block;
  margin-bottom: 13px;
  font-size: 1rem;
}

.map-node span {
  display: block;
  margin-top: 7px;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.73rem;
}

.map-arrow {
  color: var(--acid);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  text-align: center;
}

.map-return {
  position: relative;
  z-index: 1;
  margin: 36px auto 0;
  padding-top: 20px;
  border-top: 1px dashed rgba(255, 255, 255, 0.17);
  color: rgba(255, 255, 255, 0.62);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.7rem;
  text-align: center;
}

.principles-panel {
  padding: 38px;
  background: var(--acid);
}

.principles-panel h3 {
  max-width: 350px;
  margin-bottom: 36px;
  font-size: 2rem;
  line-height: 1.06;
  letter-spacing: -0.045em;
}

.principle-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.principle-list li {
  display: grid;
  grid-template-columns: 23px 1fr;
  gap: 13px;
  padding: 17px 0;
  border-top: 1px solid rgba(17, 29, 25, 0.2);
  font-size: 0.9rem;
  font-weight: 750;
}

.principle-list li::before {
  content: "✓";
  font-weight: 950;
}

.store-strip {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 50px;
  align-items: center;
  padding: 50px;
  border: 1px solid var(--line);
  border-radius: 25px;
  background: var(--paper-strong);
}

.store-strip h2 {
  margin-bottom: 20px;
  font-size: clamp(2.2rem, 4vw, 3.6rem);
}

.store-strip p {
  max-width: 620px;
  margin-bottom: 0;
  color: var(--ink-soft);
}

.package-stack {
  display: grid;
  gap: 10px;
}

.package-card {
  display: grid;
  grid-template-columns: 45px 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper);
}

.package-icon {
  display: grid;
  width: 45px;
  height: 45px;
  place-items: center;
  border-radius: 11px;
  color: white;
  background: var(--ink);
  font-weight: 900;
}

.package-card strong,
.package-card small {
  display: block;
}

.package-card small {
  color: var(--ink-soft);
}

.package-status {
  padding: 5px 8px;
  border-radius: 999px;
  color: #16563f;
  background: rgba(146, 215, 184, 0.45);
  font-size: 0.68rem;
  font-weight: 900;
  text-transform: uppercase;
}

.quickstart {
  color: white;
  background: #172723;
}

.quickstart .section {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: clamp(50px, 10vw, 120px);
  align-items: start;
}

.quickstart .section-kicker {
  color: var(--acid);
}

.quickstart h2 {
  margin-bottom: 24px;
}

.quickstart p {
  color: rgba(255, 255, 255, 0.62);
}

.quickstart .button-secondary {
  border-color: rgba(255, 255, 255, 0.5);
  color: white;
  background: transparent;
}

.steps {
  display: grid;
  gap: 12px;
  counter-reset: setup;
}

.setup-step {
  position: relative;
  padding: 25px 25px 25px 72px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.045);
  counter-increment: setup;
}

.setup-step::before {
  position: absolute;
  top: 23px;
  left: 24px;
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 50%;
  color: var(--ink);
  background: var(--acid);
  content: counter(setup);
  font-size: 0.72rem;
  font-weight: 950;
}

.setup-step h3 {
  margin-bottom: 7px;
  font-size: 1rem;
}

.setup-step p {
  margin-bottom: 0;
  font-size: 0.86rem;
}

.setup-step code {
  color: var(--acid);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.site-footer {
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 30px;
  padding: 52px 0;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  font-weight: 900;
}

.footer-brand img {
  width: 32px;
  height: 32px;
}

.footer-inner p {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 0.78rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
  font-size: 0.8rem;
  font-weight: 800;
}

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

  *,
  *::before,
  *::after {
    transition: none !important;
  }
}

@media (max-width: 920px) {
  .menu-button {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 66px;
    right: 20px;
    display: none;
    width: min(330px, calc(100vw - 40px));
    align-items: stretch;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--paper-strong);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: grid;
  }

  .site-nav a {
    padding: 6px 3px;
  }

  .language-switch {
    width: max-content;
  }

  .github-link {
    width: max-content;
  }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 78px;
  }

  .hero-copy {
    max-width: 760px;
  }

  .receipt-wrap {
    width: min(100%, 600px);
    margin-inline: auto;
  }

  .section-heading,
  .problem-band .section,
  .architecture-shell,
  .store-strip,
  .quickstart .section {
    grid-template-columns: 1fr;
  }

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

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

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

  .map-flow {
    grid-template-columns: 1fr;
  }

  .map-arrow {
    transform: rotate(90deg);
  }
}

@media (max-width: 620px) {
  .header-inner,
  .hero,
  .section,
  .footer-inner {
    width: min(calc(100% - 28px), var(--max));
  }

  .header-inner {
    height: 66px;
  }

  .hero {
    min-height: 0;
    padding: 62px 0 68px;
    gap: 55px;
  }

  h1 {
    font-size: clamp(3.1rem, 16vw, 5rem);
  }

  .button-row,
  .button {
    width: 100%;
  }

  .receipt-wrap {
    padding: 6px;
  }

  .receipt-body {
    padding: 20px;
  }

  .execution-time {
    display: none;
  }

  .receipt-footer {
    margin: 20px -20px -20px;
    padding-inline: 20px;
  }

  .section {
    padding: 75px 0;
  }

  .section-heading {
    gap: 24px;
    margin-bottom: 38px;
  }

  .problem-quote {
    padding: 31px 25px;
  }

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

  .flow-card,
  .flow-card + .flow-card {
    padding: 26px 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .flow-card:first-child {
    border-top: 0;
  }

  .flow-number {
    margin-bottom: 23px;
  }

  .capability-card {
    min-height: 0;
  }

  .capability-icon {
    margin-bottom: 32px;
  }

  .architecture-map,
  .principles-panel,
  .store-strip {
    padding: 26px;
  }

  .package-card {
    grid-template-columns: 40px 1fr;
  }

  .package-icon {
    width: 40px;
    height: 40px;
  }

  .package-status {
    display: none;
  }

  .quickstart .section {
    gap: 42px;
  }

  .setup-step {
    padding: 66px 20px 22px;
  }

  .setup-step::before {
    top: 20px;
    left: 20px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

.fd {
  --fd-surface: var(--paper-strong);
  --fd-edge: var(--line);
  --fd-text: var(--ink);
  --fd-faint: var(--ink-soft);
  --fd-accent: color-mix(in srgb, var(--acid) 55%, var(--ink));
  --fd-accent-ink: color-mix(in srgb, var(--acid) 40%, var(--ink));
  --fd-warn: var(--coral);
  --fd-info: color-mix(in srgb, var(--blue) 45%, var(--ink));
  --fd-font: inherit;
  --fd-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}