:root {
  color-scheme: light;
  --ink: #111827;
  --muted: #657084;
  --line: #dce4ee;
  --surface: #ffffff;
  --wash: #f5f5f7;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --aqua: #79c6ff;
  --mint: #dbeeff;
  --lavender: #dfe4ef;
  --focus: #6ea8ff;
  font-family:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
    'Microsoft YaHei', sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--wash);
  color: var(--ink);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  line-height: 1.7;
}

a {
  color: var(--accent);
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--accent-hover);
}

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

.skip-link {
  position: fixed;
  left: 1rem;
  top: -4rem;
  z-index: 20;
  border-radius: 0.5rem;
  background: var(--ink);
  color: white;
  padding: 0.65rem 0.9rem;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(250, 252, 255, 0.86);
  backdrop-filter: blur(18px);
}

.header-inner,
.page-shell,
.site-footer {
  width: min(100% - 2rem, 72rem);
  margin-inline: auto;
}

.header-inner {
  min-height: 4.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand-mark {
  display: grid;
  width: 2.25rem;
  height: 2.25rem;
  place-items: center;
  border-radius: 0.7rem;
  background: var(--accent);
  color: white;
  font-size: 0.9rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.25rem;
}

.site-nav a {
  border-radius: 0.55rem;
  color: var(--muted);
  padding: 0.4rem 0.65rem;
  text-decoration: none;
}

.site-nav a[aria-current='page'] {
  background: var(--wash);
  color: var(--ink);
  font-weight: 650;
}

.page-shell {
  padding-block: clamp(2.5rem, 7vw, 6.5rem);
}

.home-hero {
  display: grid;
  min-height: min(48rem, calc(100vh - 4.5rem));
  align-items: center;
  grid-template-columns: minmax(0, 1.03fr) minmax(20rem, 0.97fr);
  gap: clamp(2rem, 6vw, 6rem);
  padding-block: clamp(2rem, 6vw, 5rem);
}

.hero-copy {
  max-width: 42rem;
}

.hero {
  max-width: 48rem;
  padding-block: clamp(1rem, 3vw, 2rem);
}

.eyebrow {
  margin: 0 0 0.65rem;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 1.25rem;
  font-size: clamp(3rem, 7vw, 5.8rem);
  line-height: 1.08;
  letter-spacing: -0.045em;
}

h2 {
  margin-bottom: 0.8rem;
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  line-height: 1.3;
}

h3 {
  margin-bottom: 0.5rem;
  font-size: 1.05rem;
}

.lead {
  max-width: 42rem;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.release-note {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.release-note span {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 999px;
  background: #17a673;
  box-shadow: 0 0 0 0.3rem rgba(23, 166, 115, 0.1);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  min-height: 2.8rem;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--accent);
  color: white;
  padding: 0.65rem 1rem;
  font: inherit;
  font-weight: 650;
  text-decoration: none;
  cursor: pointer;
}

.button:hover {
  background: var(--accent-hover);
  color: white;
}

.button-secondary {
  border-color: var(--line);
  background: var(--surface);
  color: var(--ink);
}

.button-secondary:hover {
  background: var(--wash);
  color: var(--ink);
}

.product-preview {
  position: relative;
  width: min(100%, 34rem);
  aspect-ratio: 1;
  justify-self: center;
  overflow: hidden;
  border: 1px solid #e5e5e7;
  border-radius: clamp(2rem, 5vw, 4.5rem);
  background: #fbfbfd;
  box-shadow: 0 1.5rem 4rem rgba(0, 0, 0, 0.06);
}

.preview-orbit {
  position: absolute;
  border: 1px solid #e2e7ef;
  border-radius: 999px;
}

.orbit-one {
  inset: 18%;
}

.orbit-two {
  inset: 5%;
}

.preview-node {
  position: absolute;
  z-index: 2;
  display: grid;
  place-items: center;
  border: 0.25rem solid rgba(255, 255, 255, 0.82);
  border-radius: 50%;
  color: white;
  font-weight: 750;
  box-shadow: 0 0.3rem 1rem rgba(0, 0, 0, 0.07);
}

.node-self {
  top: 40%;
  left: 40%;
  width: 20%;
  height: 20%;
  background: var(--accent);
  font-size: clamp(1.3rem, 4vw, 2rem);
}

.node-first {
  width: 13%;
  height: 13%;
  background: #76a9f7;
}

.node-a {
  top: 18%;
  left: 22%;
}

.node-b {
  right: 17%;
  bottom: 22%;
}

.node-second {
  width: 7%;
  height: 7%;
  border-width: 0.16rem;
  background: var(--lavender);
}

.node-c {
  top: 17%;
  right: 19%;
}

.node-d {
  bottom: 15%;
  left: 20%;
}

.node-e {
  top: 56%;
  left: 13%;
}

.preview-edge {
  position: absolute;
  z-index: 1;
  height: 1px;
  transform-origin: left center;
  background: #b7c5d8;
}

.edge-one {
  top: 46%;
  left: 29%;
  width: 27%;
  rotate: 35deg;
}

.edge-two {
  top: 48%;
  left: 47%;
  width: 31%;
  rotate: -28deg;
}

.edge-three {
  top: 28%;
  left: 28%;
  width: 46%;
  rotate: 12deg;
}

.edge-four {
  top: 52%;
  left: 19%;
  width: 48%;
  rotate: 58deg;
}

.preview-label {
  position: absolute;
  z-index: 3;
  border: 1px solid rgba(255, 255, 255, 0.92);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.94);
  color: var(--ink);
  padding: 0.3rem 0.65rem;
  box-shadow: 0 0.35rem 1rem rgba(0, 0, 0, 0.06);
  font-size: 0.78rem;
  font-weight: 650;
}

.label-a {
  top: 31%;
  left: 18%;
}

.label-b {
  right: 11%;
  bottom: 32%;
}

.section-block {
  scroll-margin-top: 6rem;
  padding-block: clamp(4rem, 9vw, 8rem);
}

.section-title {
  max-width: 44rem;
  margin-bottom: 1rem;
  font-size: clamp(2rem, 5vw, 3.8rem);
  line-height: 1.12;
  letter-spacing: -0.04em;
}

.section-lead {
  max-width: 42rem;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.2rem);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 3rem;
}

.card,
.support-card,
.notice {
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--surface);
}

.card {
  padding: 1.4rem;
}

.feature-grid {
  margin-top: 3.5rem;
}

.feature-card {
  min-height: 17rem;
  border-color: rgba(214, 225, 239, 0.9);
  background: #ffffff;
  box-shadow: 0 1.2rem 3rem rgba(0, 0, 0, 0.04);
}

.feature-card h3 {
  margin-top: 2.75rem;
  font-size: 1.35rem;
}

.card-index {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.card p,
.muted {
  color: var(--muted);
}

.product-principles {
  display: grid;
  grid-template-columns: minmax(16rem, 0.8fr) minmax(20rem, 1.2fr);
  gap: clamp(2rem, 8vw, 8rem);
}

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

.principle-list li {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1rem;
  border-top: 1px solid var(--line);
  padding-block: 1.35rem;
}

.principle-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.principle-list > li > span {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
}

.principle-list h3,
.principle-list p {
  margin-bottom: 0.2rem;
}

.principle-list p {
  color: var(--muted);
}

.company-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.7fr);
  gap: clamp(2rem, 8vw, 7rem);
  border-top: 1px solid var(--line);
}

.company-facts {
  margin: 0;
}

.company-facts div {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: 1rem;
  border-top: 1px solid var(--line);
  padding-block: 1rem;
}

.company-facts div:last-child {
  border-bottom: 1px solid var(--line);
}

.company-facts dt {
  color: var(--muted);
}

.company-facts dd {
  margin: 0;
  font-weight: 650;
}

.support-card {
  display: grid;
  gap: 1rem;
  max-width: 42rem;
  margin-block: 2rem 3rem;
  padding: clamp(1.25rem, 4vw, 2rem);
}

.support-email {
  overflow-wrap: anywhere;
  color: var(--ink);
  font-size: clamp(1.25rem, 5vw, 2rem);
  font-weight: 720;
  letter-spacing: -0.02em;
}

.copy-status {
  min-height: 1.7em;
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.faq {
  display: grid;
  gap: 0;
  max-width: 50rem;
  margin-top: 2rem;
}

.faq article {
  border-top: 1px solid var(--line);
  padding-block: 1.35rem;
}

.faq article:last-child {
  border-bottom: 1px solid var(--line);
}

.notice {
  max-width: 50rem;
  margin-block: 1.5rem;
  padding: 1.25rem;
}

.steps {
  max-width: 50rem;
  padding-left: 1.4rem;
}

.steps li {
  margin-bottom: 0.8rem;
  padding-left: 0.35rem;
}

.legal-copy {
  max-width: 52rem;
  margin-inline: auto;
}

.legal-copy h1 {
  font-size: clamp(2rem, 6vw, 3.25rem);
}

.legal-copy h2 {
  margin-top: 2.75rem;
}

.legal-copy p {
  margin-bottom: 1rem;
  overflow-wrap: anywhere;
}

.legal-meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--line);
  padding-block: 1.5rem 2.5rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.site-footer p {
  margin: 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

@media (max-width: 760px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    padding-block: 0.9rem;
  }

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

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

  .home-hero,
  .product-principles,
  .company-panel {
    min-height: auto;
    grid-template-columns: 1fr;
  }

  .product-preview {
    width: min(100%, 28rem);
    order: -1;
  }

  .home-hero h1 {
    font-size: clamp(3rem, 15vw, 4.3rem);
  }

  .feature-card {
    min-height: auto;
  }
}

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