:root {
  --ink: #1a1c1e;
  --paper: #f7f4ef;
  --copper: #b86a2b;
  --mute: #5c5852;
  --line: rgba(26, 28, 30, 0.12);
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "IBM Plex Sans", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 1.05rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.shell {
  width: min(1080px, calc(100% - 2.5rem));
  margin-inline: auto;
}

.site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 2;
  padding: 1.35rem 0;
}

.brand-mark {
  margin: 0;
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--ink);
}

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: center;
  overflow: hidden;
  isolation: isolate;
}

.hero-atmosphere {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 55% at 18% 22%, rgba(184, 106, 43, 0.14), transparent 55%),
    radial-gradient(ellipse 70% 50% at 88% 78%, rgba(26, 28, 30, 0.08), transparent 60%),
    linear-gradient(165deg, #fbf8f3 0%, var(--paper) 45%, #efe8dc 100%),
    url("../img/paper.svg");
  background-size: auto, auto, auto, 280px;
}

.hero-copy {
  padding: 7rem 0 5rem;
}

.brand-title {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(3.4rem, 11vw, 6.4rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0.08em;
  color: var(--ink);
}

.product-name {
  margin: 1.1rem 0 0;
  font-family: var(--serif);
  font-size: clamp(1.35rem, 3.2vw, 1.85rem);
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--copper);
}

.tagline {
  margin: 1.75rem 0 0;
  max-width: 28em;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  font-weight: 500;
  color: var(--ink);
}

.support {
  margin: 0.85rem 0 0;
  max-width: 32em;
  color: var(--mute);
}

.reveal-brand,
.reveal-cap {
  opacity: 0;
  transform: translateY(0.7rem);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-brand.is-in,
.reveal-cap.is-in {
  opacity: 1;
  transform: none;
}

.reveal-brand:nth-child(1) { transition-delay: 0.05s; }
.reveal-brand:nth-child(2) { transition-delay: 0.16s; }
.reveal-brand:nth-child(3) { transition-delay: 0.28s; }
.reveal-brand:nth-child(4) { transition-delay: 0.4s; }

.reveal-cap:nth-child(1) { transition-delay: 0.05s; }
.reveal-cap:nth-child(2) { transition-delay: 0.12s; }
.reveal-cap:nth-child(3) { transition-delay: 0.19s; }
.reveal-cap:nth-child(4) { transition-delay: 0.26s; }

.capabilities,
.entity {
  padding: 4.5rem 0;
}

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

.section-title {
  margin: 0 0 1.75rem;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.capability-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.75rem 2.5rem;
}

.capability {
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.capability h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.capability p {
  margin: 0.55rem 0 0;
  color: var(--mute);
}

.entity {
  border-top: 1px solid var(--line);
  padding-bottom: 5rem;
}

.entity-name {
  margin: 0;
  font-size: 1.1rem;
  letter-spacing: 0.04em;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0 2rem;
  background: #f1ebe3;
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
}

.footer-entity,
.footer-icp {
  margin: 0;
  font-size: 0.92rem;
  color: var(--mute);
}

.icp-link {
  color: var(--mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.icp-link:hover,
.icp-link:focus-visible {
  color: var(--copper);
  border-bottom-color: var(--copper);
  outline: none;
}

@media (max-width: 720px) {
  .capability-list {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    padding-top: 6.5rem;
  }

  .footer-row {
    flex-direction: column;
  }
}

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

  .reveal-brand,
  .reveal-cap {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .icp-link {
    transition: none;
  }
}