:root {
  --bg: #f3eee5;
  --bg-alt: #e7dccd;
  --panel: rgba(255, 250, 242, 0.72);
  --panel-strong: rgba(255, 249, 239, 0.94);
  --text: #201912;
  --muted: #655649;
  --line: rgba(32, 25, 18, 0.12);
  --accent: #e96033;
  --accent-deep: #aa3114;
  --signal: #0f8a78;
  --shadow: 0 30px 80px rgba(58, 34, 12, 0.12);
  --radius-xl: 32px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --max-width: 1200px;
  --sans: "Avenir Next", "PingFang SC", "Noto Sans SC", sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", "Songti SC", serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(233, 96, 51, 0.18), transparent 24%),
    radial-gradient(circle at 85% 10%, rgba(15, 138, 120, 0.12), transparent 22%),
    linear-gradient(180deg, #f7f1e8 0%, var(--bg) 100%);
  font-family: var(--sans);
}

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

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

.site-shell {
  position: relative;
  overflow: hidden;
}

.site-shell::before,
.site-shell::after {
  content: "";
  position: fixed;
  inset: auto;
  pointer-events: none;
  z-index: 0;
}

.site-shell::before {
  top: 14%;
  right: -8rem;
  width: 22rem;
  height: 22rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(233, 96, 51, 0.12), transparent 65%);
}

.site-shell::after {
  bottom: 8%;
  left: -7rem;
  width: 20rem;
  height: 20rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(15, 138, 120, 0.1), transparent 65%);
}

.site-header,
.section {
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.site-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 20px;
  align-items: center;
  padding: 24px 0 20px;
  position: sticky;
  top: 10px;
  z-index: 10;
  margin-top: 10px;
  margin-bottom: 8px;
  padding-inline: 20px;
  border: 1px solid rgba(32, 25, 18, 0.08);
  border-radius: 999px;
  background: rgba(250, 244, 236, 0.7);
  backdrop-filter: blur(18px);
  box-shadow: 0 18px 42px rgba(48, 30, 15, 0.08);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand-mark img {
  width: 42px;
  height: 42px;
  flex: none;
}

.brand-mark span {
  font-family: var(--serif);
  font-size: 1.02rem;
  letter-spacing: 0.04em;
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: center;
}

.menu-toggle {
  display: none;
  border: 1px solid var(--line);
  background: rgba(255, 250, 242, 0.9);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 999px;
  font: inherit;
  cursor: pointer;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 18px;
  padding: 0 12px;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.94rem;
  padding: 8px 0;
  border-bottom: 1px solid transparent;
  transition: color 180ms ease, transform 180ms ease, border-color 180ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--text);
  transform: translateY(-1px);
}

.site-nav a.is-current {
  color: var(--text);
  border-color: rgba(32, 25, 18, 0.35);
}

.lang-switch {
  display: inline-flex;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 249, 239, 0.7);
  backdrop-filter: blur(16px);
}

.lang-toggle {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 8px 12px;
  border-radius: 999px;
  font: inherit;
  cursor: pointer;
}

.lang-toggle.is-active {
  background: var(--text);
  color: #fff8ee;
}

.section {
  padding: 48px 0;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 500ms ease, transform 500ms ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.hero {
  min-height: calc(100vh - 98px);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  gap: 36px;
  align-items: center;
  padding-top: 36px;
}

.section-kicker {
  margin: 0 0 12px;
  color: var(--accent-deep);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero h1,
.section-head h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  line-height: 0.95;
}

.hero h1 {
  max-width: 12ch;
  font-size: clamp(3.6rem, 8vw, 7rem);
}

.hero-lead {
  margin: 22px 0 0;
  max-width: 32rem;
  font-size: clamp(1.18rem, 2.1vw, 1.6rem);
  line-height: 1.45;
}

.hero-body,
.statement-panel p,
.engine-card p,
.flow-card p,
.demo-card p,
.visual-note,
.contact-body {
  color: var(--muted);
  line-height: 1.75;
}

.hero-body {
  max-width: 34rem;
  margin: 18px 0 0;
}

.hero-actions {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.primary-link,
.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 22px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), #ee7b27);
  color: #fff7ef;
  box-shadow: 0 20px 40px rgba(233, 96, 51, 0.22);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.primary-link:hover,
.primary-link:focus-visible,
.contact-link:hover,
.contact-link:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 24px 48px rgba(233, 96, 51, 0.26);
}

.secondary-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 22px;
  border-radius: 999px;
  border: 1px solid rgba(32, 25, 18, 0.14);
  background: rgba(255, 250, 242, 0.82);
  color: var(--text);
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.secondary-link:hover,
.secondary-link:focus-visible {
  transform: translateY(-2px);
  background: rgba(255, 248, 240, 0.98);
  border-color: rgba(32, 25, 18, 0.24);
}

.hero-stage {
  position: relative;
  display: grid;
  gap: 18px;
  align-content: center;
}

.stage-card,
.statement-panel,
.engine-card,
.flow-card,
.capability-card,
.demo-card,
.visual-panel,
.contact-section {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.stage-card {
  position: relative;
  overflow: hidden;
  padding: 28px;
}

.stage-card-large {
  min-height: 360px;
}

.stage-card-small {
  margin-left: auto;
  width: min(86%, 340px);
}

.stage-card p {
  position: relative;
  z-index: 1;
  max-width: 12ch;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1;
}

.stage-card-small p {
  max-width: 18ch;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--muted);
  font-family: var(--sans);
}

.stage-note,
.stage-chip,
.stage-tag,
.demo-type,
.concept-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stage-tag,
.demo-type {
  color: var(--muted);
  background: rgba(255, 255, 255, 0.56);
}

.stage-chip,
.concept-label {
  color: #fff7ef;
  background: var(--text);
}

.stage-gradient {
  position: absolute;
  inset: auto -14% -16% auto;
  width: 72%;
  height: 72%;
  border-radius: 44px;
  background:
    linear-gradient(145deg, rgba(233, 96, 51, 0.86), rgba(247, 188, 65, 0.7)),
    linear-gradient(225deg, rgba(15, 138, 120, 0.35), transparent);
  transform: rotate(-18deg);
}

.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 24px;
  align-items: start;
}

.section-head {
  max-width: 44rem;
  margin-bottom: 24px;
}

.section-head h2 {
  font-size: clamp(2rem, 4.4vw, 4rem);
}

.statement-panel {
  padding: 28px 30px;
}

.engine-grid,
.capability-grid,
.demo-grid {
  display: grid;
  gap: 22px;
}

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

.engine-card,
.capability-card,
.demo-card,
.flow-card {
  padding: 28px;
}

.engine-card-contrast {
  background:
    linear-gradient(180deg, rgba(15, 138, 120, 0.08), rgba(255, 250, 242, 0.88)),
    var(--panel-strong);
}

.engine-index,
.flow-step {
  display: inline-flex;
  margin-bottom: 18px;
  font-size: 0.88rem;
  letter-spacing: 0.16em;
  color: var(--accent-deep);
}

.engine-card h3,
.flow-card h3,
.capability-card h3,
.demo-card h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.6rem;
  font-weight: 500;
}

.bullet-list {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.bullet-list li {
  color: var(--text);
  padding-left: 18px;
  position: relative;
  line-height: 1.6;
}

.bullet-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #f7bc41);
}

.flow-grid {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.capability-grid,
.demo-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.demo-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 20px;
}

.visual-board {
  min-height: 340px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
  margin-bottom: 22px;
}

.visual-panel {
  min-height: 160px;
  overflow: hidden;
}

.visual-panel-large {
  grid-row: span 2;
  background:
    linear-gradient(160deg, rgba(24, 20, 17, 0.95), rgba(88, 56, 38, 0.54)),
    radial-gradient(circle at 30% 20%, rgba(247, 188, 65, 0.36), transparent 24%);
}

.visual-panel-accent {
  background:
    radial-gradient(circle at 22% 28%, rgba(233, 96, 51, 0.88), transparent 28%),
    linear-gradient(135deg, rgba(255, 244, 230, 0.9), rgba(229, 218, 201, 0.92));
}

.visual-panel-soft {
  background:
    linear-gradient(135deg, rgba(15, 138, 120, 0.8), rgba(242, 232, 215, 0.92)),
    radial-gradient(circle at 70% 30%, rgba(255, 255, 255, 0.2), transparent 22%);
}

.keyword-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.keyword-cluster span {
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 249, 239, 0.7);
  color: var(--muted);
}

.contact-section {
  padding: 36px;
  background:
    linear-gradient(135deg, rgba(255, 248, 240, 0.95), rgba(243, 232, 218, 0.92)),
    var(--panel-strong);
}

.contact-section .section-head {
  margin-bottom: 8px;
}

.contact-link {
  margin-top: 16px;
  font-size: 1.02rem;
}

.subpage-main {
  padding-bottom: 12px;
}

.subpage-hero {
  min-height: auto;
  padding-top: 20px;
}

.site-footer {
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto 44px;
  padding: 32px;
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(220px, 0.9fr);
  gap: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(135deg, rgba(255, 248, 240, 0.92), rgba(237, 226, 210, 0.9)),
    var(--panel-strong);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.footer-brand h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.8rem, 3vw, 3rem);
  font-weight: 500;
  line-height: 1.02;
}

.footer-body,
.footer-note {
  color: var(--muted);
  line-height: 1.75;
}

.footer-links {
  display: grid;
  align-content: start;
  gap: 12px;
}

.footer-links a {
  color: var(--muted);
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(32, 25, 18, 0.08);
  transition: color 180ms ease, border-color 180ms ease;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--text);
  border-color: rgba(32, 25, 18, 0.24);
}

.footer-note {
  grid-column: 1 / -1;
  margin: 0;
}

@media (max-width: 1040px) {
  .site-header {
    grid-template-columns: 1fr;
    justify-items: stretch;
    border-radius: 28px;
  }

  .site-nav {
    justify-content: flex-start;
    padding: 0;
  }

  .hero,
  .section-grid,
  .engine-grid,
  .capability-grid,
  .demo-grid,
  .flow-grid,
  .site-footer {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 20px;
  }

  .stage-card-small {
    width: 100%;
    margin-left: 0;
  }
}

@media (max-width: 720px) {
  .site-header,
  .section,
  .site-footer {
    width: min(calc(100% - 20px), var(--max-width));
  }

  .site-header {
    padding-top: 18px;
    padding-bottom: 18px;
    padding-inline: 16px;
  }

  .nav-shell {
    width: 100%;
    justify-content: flex-start;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    width: 100%;
    margin-top: 12px;
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: rgba(255, 248, 240, 0.94);
    box-shadow: 0 16px 34px rgba(48, 30, 15, 0.08);
  }

  .site-nav.is-open {
    display: grid;
    gap: 8px;
  }

  .site-nav a {
    padding: 10px 0;
    border-bottom-color: rgba(32, 25, 18, 0.08);
  }

  .site-nav a:last-child {
    border-bottom-color: transparent;
  }

  .hero h1 {
    max-width: none;
  }

  .hero-lead {
    font-size: 1.08rem;
  }

  .section {
    padding: 34px 0;
  }

  .stage-card,
  .engine-card,
  .flow-card,
  .capability-card,
  .demo-card,
  .statement-panel,
  .contact-section,
  .site-footer {
    padding: 22px;
    border-radius: 24px;
  }

  .stage-card-large {
    min-height: 280px;
  }

  .visual-board {
    min-height: 0;
    grid-template-columns: 1fr;
  }

  .hero-actions {
    align-items: stretch;
  }

  .primary-link,
  .secondary-link,
  .contact-link {
    justify-content: center;
    width: 100%;
  }
}

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

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .site-nav a,
  .primary-link,
  .secondary-link,
  .contact-link {
    transition: none;
  }
}