:root {
  --lp-bg: #f5f2eb;
  --lp-paper: #fbfaf6;
  --lp-surface: #ebe9e1;
  --lp-surface-strong: #e1e5de;
  --lp-ink: #171815;
  --lp-ink-2: #53564f;
  --lp-ink-3: #666a62;
  --lp-line: rgba(23, 24, 21, 0.14);
  --lp-line-strong: rgba(23, 24, 21, 0.24);
  --lp-accent: #356f7d;
  --lp-accent-dark: #285966;
  --lp-positive: #5b7463;
  --lp-warn: #a77936;
  --lp-radius: 14px;
  --lp-shadow: 0 2px 8px rgba(31, 35, 30, 0.12);
  --lp-ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --lp-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC",
             system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --lp-serif: Georgia, "Times New Roman", "Songti SC", serif;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--lp-bg);
  color: var(--lp-ink);
  font-family: var(--lp-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

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

button {
  font: inherit;
}

h1,
h2,
h3,
p {
  overflow-wrap: break-word;
}

h1,
h2,
h3 {
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  transform: translateY(-160%);
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--lp-ink);
  color: #fff;
}

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

.lp-container {
  width: min(1240px, calc(100% - 64px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--lp-line);
  background: rgba(245, 242, 235, 0.96);
}

.header-inner {
  min-height: 72px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 36px;
}

.brand-lockup {
  min-width: 0;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--lp-line-strong);
  border-radius: 10px;
  color: var(--lp-accent-dark);
}

.brand-name {
  font-family: var(--lp-serif);
  font-size: 23px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-parent {
  padding-left: 10px;
  border-left: 1px solid var(--lp-line);
  color: var(--lp-ink-3);
  font-size: 12px;
}

.site-nav {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 30px;
}

.site-nav a {
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--lp-ink-2);
  font-size: 13px;
  font-weight: 600;
}

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

.lp-button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border: 1px solid var(--lp-accent);
  border-radius: 10px;
  background: var(--lp-accent);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  transition:
    background 160ms var(--lp-ease-out),
    border-color 160ms var(--lp-ease-out),
    transform 160ms var(--lp-ease-out);
}

.lp-button:hover {
  border-color: var(--lp-accent-dark);
  background: var(--lp-accent-dark);
  transform: translateY(-1px);
}

.lp-button-small {
  min-height: 44px;
  padding-inline: 20px;
  font-size: 13px;
}

.hero {
  min-height: calc(100svh - 72px);
  display: flex;
  align-items: center;
  padding: 68px 0 72px;
  border-bottom: 1px solid var(--lp-line);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(380px, 0.82fr) minmax(600px, 1.35fr);
  gap: clamp(48px, 6vw, 88px);
  align-items: center;
}

.hero-copy,
.hero-product {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--lp-accent-dark);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero h1,
.section-heading h2,
.final-cta h2 {
  margin: 0;
  font-weight: 650;
  letter-spacing: -0.04em;
  line-height: 1.12;
}

.hero h1 {
  max-width: 10.5em;
  font-size: clamp(44px, 5vw, 72px);
}

.hero-lead {
  max-width: 38em;
  margin: 28px 0 0;
  color: var(--lp-ink-2);
  font-size: clamp(16px, 1.35vw, 19px);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-top: 38px;
}

.text-link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  border-bottom: 1px solid var(--lp-accent);
  color: var(--lp-accent-dark);
  font-size: 14px;
  font-weight: 700;
}

.hero-product {
  margin: 0;
  border: 1px solid var(--lp-line-strong);
  border-radius: var(--lp-radius);
  background: var(--lp-paper);
  box-shadow: var(--lp-shadow);
  line-height: 0;
}

.hero-product img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: calc(var(--lp-radius) - 1px);
}

.lp-section {
  padding: clamp(82px, 10vw, 144px) 0;
  border-bottom: 1px solid var(--lp-line);
}

.section-heading {
  max-width: 660px;
}

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

.section-heading h2,
.final-cta h2 {
  font-size: clamp(34px, 4vw, 56px);
}

.section-heading > p:last-child {
  max-width: 70ch;
  margin: 22px 0 0;
  color: var(--lp-ink-2);
  font-size: 17px;
  line-height: 1.8;
}

.delivery-loop {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  margin: 64px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--lp-line-strong);
}

.delivery-loop li {
  min-width: 0;
  padding: 22px 22px 0 0;
}

.delivery-loop li + li {
  padding-left: 22px;
  border-left: 1px solid var(--lp-line);
}

.delivery-loop span,
.scenario-steps article > span,
.platform-model article > span {
  color: var(--lp-accent-dark);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.delivery-loop h3,
.scenario-steps h3,
.platform-model h3 {
  margin: 18px 0 8px;
  font-size: 18px;
}

.delivery-loop p,
.scenario-steps p,
.platform-model p {
  margin: 0;
  color: var(--lp-ink-2);
  font-size: 14px;
}

.scenario-section {
  background: var(--lp-paper);
}

.scenario-grid,
.control-grid,
.faq-grid {
  display: grid;
  grid-template-columns: minmax(300px, 0.8fr) minmax(480px, 1.2fr);
  gap: clamp(54px, 8vw, 110px);
  align-items: start;
}

.scenario-grid > *,
.control-grid > *,
.faq-grid > * {
  min-width: 0;
}

.scenario-steps {
  border-top: 1px solid var(--lp-line-strong);
}

.scenario-steps article {
  display: grid;
  grid-template-columns: 70px minmax(170px, 0.9fr) minmax(0, 1.1fr);
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--lp-line);
}

.scenario-steps h3 {
  margin: 0;
}

.platform-model {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 64px;
  border-top: 1px solid var(--lp-line-strong);
}

.platform-model article {
  min-width: 0;
  min-height: 230px;
  padding: 28px 32px 0 0;
}

.platform-model article + article {
  padding-left: 32px;
  border-left: 1px solid var(--lp-line);
}

.control-section {
  background: #183038;
  color: #f7f6f1;
}

.control-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(255, 255, 255, 0.25);
}

.control-list li {
  display: grid;
  grid-template-columns: minmax(150px, 0.65fr) minmax(0, 1.35fr);
  gap: 28px;
  padding: 24px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.control-list strong {
  font-size: 16px;
}

.control-list span {
  color: rgba(255, 255, 255, 0.66);
  font-size: 14px;
}

.asset-rail {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  margin-top: 58px;
  border-block: 1px solid var(--lp-line-strong);
}

.asset-rail span {
  min-width: 0;
  min-height: 100px;
  display: flex;
  align-items: center;
  padding: 18px;
  color: var(--lp-ink-2);
  font-size: 14px;
  font-weight: 700;
}

.asset-rail span + span {
  border-left: 1px solid var(--lp-line);
}

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

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

.faq-list summary {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}

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

.faq-list summary::after {
  content: "+";
  flex: 0 0 auto;
  color: var(--lp-accent-dark);
  font-family: var(--lp-serif);
  font-size: 26px;
  font-weight: 400;
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list details p {
  max-width: 60em;
  margin: -4px 0 24px;
  color: var(--lp-ink-2);
}

.final-cta {
  padding: 76px 0;
  background: var(--lp-paper);
}

.final-cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.site-footer {
  padding: 42px 0;
  border-top: 1px solid var(--lp-line);
  background: var(--lp-bg);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  grid-template-areas: "brand copyright nav";
  align-items: end;
  gap: 36px;
  color: var(--lp-ink-3);
  font-size: 13px;
}

.footer-inner p {
  grid-area: brand;
  display: flex;
  flex-direction: column;
  margin: 0;
}

.footer-inner strong {
  color: var(--lp-ink);
  font-family: var(--lp-serif);
  font-size: 18px;
}

.footer-inner nav {
  grid-area: nav;
  justify-self: end;
  display: flex;
  gap: 24px;
}

.footer-inner small {
  grid-area: copyright;
  justify-self: center;
  white-space: nowrap;
}

.footer-inner nav a {
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

:focus-visible {
  outline: 3px solid var(--lp-paper);
  outline-offset: 2px;
  box-shadow: 0 0 0 5px var(--lp-accent-dark);
}

@media (max-width: 1120px) {
  .lp-container {
    width: min(calc(100% - 44px), 960px);
  }

  .header-inner {
    gap: 22px;
  }

  .site-nav {
    gap: 18px;
  }

  .hero {
    align-items: flex-start;
  }

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

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

  .hero-product {
    width: 100%;
  }

  .delivery-loop {
    grid-template-columns: repeat(3, 1fr);
    row-gap: 34px;
  }

  .delivery-loop li:nth-child(4) {
    border-left: 0;
    padding-left: 0;
  }

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

@media (max-width: 720px) {
  html {
    scroll-padding-top: 72px;
  }

  .lp-container {
    width: min(calc(100% - 32px), 640px);
  }

  .header-inner {
    min-height: 64px;
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .site-nav,
  .brand-parent {
    display: none;
  }

  .brand-name {
    font-size: 21px;
  }

  .hero {
    min-height: auto;
    padding: 56px 0 64px;
  }

  .hero h1 {
    font-size: clamp(38px, 11vw, 54px);
  }

  .hero h1 br {
    display: none;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
    gap: 12px;
  }

  .text-link {
    align-self: flex-start;
  }

  .delivery-loop,
  .platform-model,
  .asset-rail {
    grid-template-columns: minmax(0, 1fr);
  }

  .delivery-loop {
    row-gap: 0;
  }

  .delivery-loop li,
  .delivery-loop li + li,
  .delivery-loop li:nth-child(4) {
    padding: 20px 0;
    border-left: 0;
    border-bottom: 1px solid var(--lp-line);
  }

  .scenario-steps article {
    grid-template-columns: 52px minmax(0, 1fr);
  }

  .scenario-steps article p {
    grid-column: 2;
  }

  .platform-model article,
  .platform-model article + article {
    min-height: 0;
    padding: 24px 0;
    border-left: 0;
    border-bottom: 1px solid var(--lp-line);
  }

  .control-list li {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .asset-rail span,
  .asset-rail span + span {
    min-height: 64px;
    padding: 14px 0;
    border-left: 0;
    border-bottom: 1px solid var(--lp-line);
  }

  .final-cta-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "brand"
      "nav"
      "copyright";
    align-items: start;
  }

  .footer-inner nav {
    justify-self: start;
  }
}

@media (max-width: 420px) {
  .lp-container {
    width: calc(100% - 24px);
  }

  .header-inner {
    gap: 12px;
  }

  .lp-button-small {
    padding-inline: 16px;
  }

  .hero h1 {
    font-size: 36px;
  }

}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}