:root {
  --ink: #20231f;
  --muted: #666a62;
  --cream: #f5efe4;
  --paper: #fffdf8;
  --orange: #d86f3c;
  --orange-dark: #9e4823;
  --sage: #60705d;
  --line: rgba(32, 35, 31, 0.14);
  --shadow: 0 28px 70px rgba(77, 57, 36, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 82% 10%, rgba(216, 111, 60, 0.12), transparent 24rem),
    var(--paper);
  font-family:
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  line-height: 1.65;
}

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

.site-header,
main,
footer {
  width: min(1160px, calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  min-height: 86px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  color: white;
  background: var(--ink);
  font-family: "Songti SC", "STSong", serif;
  font-size: 22px;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 20px;
  line-height: 1.1;
}

.brand small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 9px;
  letter-spacing: 0.24em;
}

nav {
  display: flex;
  gap: 32px;
  color: var(--muted);
  font-size: 14px;
}

nav a {
  padding: 10px 0;
}

nav a:hover,
nav a:focus-visible {
  color: var(--orange-dark);
}

.hero {
  min-height: 680px;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  gap: 80px;
  align-items: center;
  padding: 92px 0 100px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--orange-dark);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
}

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

h1,
h2 {
  font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  font-weight: 600;
  letter-spacing: -0.035em;
}

h1 {
  margin-bottom: 28px;
  font-size: clamp(60px, 8vw, 104px);
  line-height: 0.98;
}

h1 em {
  color: var(--orange);
  font-style: normal;
}

.hero-intro {
  max-width: 650px;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: 18px;
}

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

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease;
}

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

.button.primary {
  color: white;
  background: var(--ink);
  box-shadow: 0 12px 24px rgba(32, 35, 31, 0.18);
}

.button.secondary {
  background: transparent;
}

.signal-card {
  position: relative;
  padding: 34px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 30px;
  color: white;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.08), transparent 55%),
    var(--sage);
  box-shadow: var(--shadow);
}

.signal-card::after {
  content: "";
  position: absolute;
  right: -72px;
  bottom: -84px;
  width: 190px;
  height: 190px;
  border: 38px solid rgba(255, 255, 255, 0.08);
  border-radius: 50%;
}

.signal-label {
  display: inline-block;
  margin-bottom: 28px;
  padding: 5px 12px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.12em;
}

.signal-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 17px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.signal-row span {
  color: rgba(255, 255, 255, 0.74);
  font-size: 14px;
}

.signal-row strong {
  font-size: 15px;
}

.signal-card > p {
  position: relative;
  z-index: 1;
  margin: 28px 0 0;
  color: rgba(255, 255, 255, 0.8);
  font-size: 14px;
}

.section {
  padding: 110px 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 56px;
}

h2 {
  margin-bottom: 22px;
  font-size: clamp(38px, 5vw, 62px);
  line-height: 1.16;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.feature-grid article {
  min-height: 280px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.65);
}

.number {
  color: var(--orange);
  font-family: ui-monospace, monospace;
  font-size: 12px;
}

h3 {
  margin: 66px 0 14px;
  font-size: 22px;
}

.feature-grid p,
.about-main p,
.english-summary p {
  color: var(--muted);
}

.method {
  padding-inline: 48px;
  border: 0;
  border-radius: 36px;
  background: var(--cream);
}

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

.steps li {
  padding: 0 22px;
  border-left: 1px solid rgba(32, 35, 31, 0.16);
}

.steps li:first-child {
  padding-left: 0;
  border-left: 0;
}

.steps li > span {
  display: grid;
  width: 34px;
  height: 34px;
  margin-bottom: 22px;
  place-items: center;
  border-radius: 50%;
  color: white;
  background: var(--orange);
  font-family: ui-monospace, monospace;
  font-size: 12px;
}

.steps strong,
.steps small {
  display: block;
}

.steps strong {
  margin-bottom: 6px;
}

.steps small {
  color: var(--muted);
  font-size: 13px;
}

.responsible,
.about {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.responsible p:last-child {
  color: var(--muted);
  font-size: 17px;
}

.about-main {
  max-width: 560px;
}

.company-facts {
  margin: 0;
  border-top: 1px solid var(--line);
}

.company-facts div {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.company-facts dt {
  color: var(--muted);
  font-size: 13px;
}

.company-facts dd {
  margin: 0;
  font-weight: 600;
}

.english-summary {
  margin: 10px 0 110px;
  padding: 56px;
  border-radius: 30px;
  color: white;
  background: var(--ink);
}

.english-summary .eyebrow {
  color: #f1a47e;
}

.english-summary h2 {
  max-width: 900px;
  font-family: Georgia, "Times New Roman", serif;
}

.english-summary p {
  max-width: 850px;
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.72);
}

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 130px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
}

.footer-brand .brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 11px;
  font-size: 18px;
}

.footer-brand strong {
  color: var(--ink);
  font-size: 16px;
}

@media (max-width: 820px) {
  .site-header,
  main,
  footer {
    width: min(100% - 30px, 1160px);
  }

  nav {
    gap: 16px;
  }

  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 48px;
    padding: 72px 0 84px;
  }

  h1 {
    font-size: clamp(56px, 18vw, 84px);
  }

  .feature-grid,
  .steps,
  .responsible,
  .about {
    grid-template-columns: 1fr;
  }

  .feature-grid article {
    min-height: 220px;
  }

  h3 {
    margin-top: 42px;
  }

  .method {
    padding: 76px 26px;
  }

  .steps {
    gap: 28px;
  }

  .steps li,
  .steps li:first-child {
    display: grid;
    grid-template-columns: 42px 1fr;
    padding: 0 0 24px;
    border: 0;
    border-bottom: 1px solid rgba(32, 35, 31, 0.16);
  }

  .steps li > span {
    margin: 0;
  }

  .responsible,
  .about {
    gap: 32px;
  }

  .english-summary {
    padding: 34px 26px;
  }

  footer {
    align-items: flex-start;
    flex-direction: column;
    padding: 36px 0;
  }
}

@media (max-width: 520px) {
  .site-header {
    min-height: 74px;
  }

  nav a:nth-child(2) {
    display: none;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
  }

  .hero-intro {
    font-size: 16px;
  }

  .section {
    padding: 78px 0;
  }

  .signal-card {
    padding: 26px;
  }

  .company-facts div {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}

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

  .button {
    transition: none;
  }
}