@font-face {
  font-family: "HarmonyOS Sans SC";
  src: url("assets/HarmonyOS_Sans_SC.woff2") format("woff2");
  font-display: swap;
}

:root {
  color-scheme: light;
  --ink: #101828;
  --muted: #5d6879;
  --line: #dfe4eb;
  --paper: #f6f8fb;
  --white: #ffffff;
  --blue: #245cff;
  --blue-dark: #17328a;
  --blue-soft: #e8efff;
  --cyan-soft: #e8f8fb;
  --green: #0a7c5c;
  --green-soft: #dff7ee;
  --orange: #9c4c05;
  --orange-soft: #fff0dc;
  --radius: 1.35rem;
  --shadow: 0 24px 70px rgba(31, 48, 82, 0.12);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 4.75rem;
  padding: 0 4vw;
  border-bottom: 1px solid rgba(223, 228, 235, 0.86);
  background: rgba(246, 248, 251, 0.88);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  width: max-content;
  font-size: 0.83rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.brand-mark {
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 0.2rem;
  background: var(--blue);
  box-shadow: 0.35rem -0.35rem 0 var(--ink);
}

nav { display: flex; gap: 2rem; }
nav a, .back-link { font-size: 0.9rem; font-weight: 650; color: #3e4959; }
nav a:hover, .back-link:hover { color: var(--blue); }
.back-link { justify-self: end; }

main, footer { overflow: hidden; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(30rem, 1.05fr);
  gap: clamp(3rem, 6vw, 7rem);
  min-height: auto;
  max-width: 92rem;
  margin: 0 auto;
  padding: 1.75rem 4vw 2rem;
  align-items: center;
}

.status-row, .section-kicker {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.product-index, .section-kicker p {
  margin: 0;
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.status {
  display: inline-flex;
  align-items: center;
  min-height: 1.75rem;
  padding: 0.15rem 0.65rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 750;
}

.status-done { color: var(--green); background: var(--green-soft); }
.status-plan { color: var(--orange); background: var(--orange-soft); }

h1 {
  max-width: 10ch;
  margin: 1rem 0 1.25rem;
  font-size: clamp(3.5rem, 6.5vw, 6.9rem);
  line-height: 0.98;
  letter-spacing: -0.07em;
}

.hero-lead {
  max-width: 34rem;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1.08rem, 1.45vw, 1.3rem);
  line-height: 1.85;
}

.hero-actions { display: flex; align-items: center; gap: 1.6rem; margin-top: 1.8rem; }
.primary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.7rem 1.25rem;
  border-radius: 0.8rem;
  color: var(--white);
  background: var(--ink);
  font-size: 0.93rem;
  font-weight: 750;
}
.primary-action:hover { background: var(--blue); }
.text-action { color: var(--muted); font-size: 0.93rem; font-weight: 650; }
.text-action:hover { color: var(--blue); }

.spec-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin: 2.8rem 0 0;
  padding: 1.2rem 0 0;
  border-top: 1px solid var(--line);
}

.spec-strip div { padding-right: 1rem; }
.spec-strip dt { font-size: 0.88rem; font-weight: 800; }
.spec-strip dd { margin: 0.12rem 0 0; color: var(--muted); font-size: 0.78rem; }

.prototype-card {
  position: relative;
  margin: 0;
  padding: 0.8rem;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 0.4rem);
  background: var(--white);
  box-shadow: var(--shadow);
}

.prototype-card::before {
  content: "01";
  position: absolute;
  top: -3.8rem;
  right: -1.4rem;
  z-index: -1;
  color: var(--blue-soft);
  font-size: clamp(8rem, 16vw, 15rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.09em;
}

.prototype-image {
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  background: #dce4ec;
}

.prototype-image img {
  width: 100%;
  height: 112%;
  object-fit: cover;
  object-position: center top;
  display: block;
}

.prototype-card figcaption {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0.3rem 0.25rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.prototype-card figcaption span:first-child { color: var(--ink); font-weight: 750; }

.value-section, .next-section, .platform-section {
  max-width: 92rem;
  margin: 0 auto;
  padding: 2.75rem 4vw;
}

.section-heading {
  display: flex;
  align-items: baseline;
  gap: clamp(2rem, 5vw, 5rem);
  padding-bottom: 1.5rem;
}

.section-heading > p, .platform-intro > p:first-child, .product-type {
  margin: 0.4rem 0 0;
  color: var(--blue);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

h2 {
  margin: 0;
  font-size: clamp(2.5rem, 5vw, 5rem);
  line-height: 1.08;
  letter-spacing: -0.055em;
}

.section-heading h2 {
  font-size: clamp(2.25rem, 3.6vw, 3.5rem);
  white-space: nowrap;
}

.value-grid {
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.value-card {
  display: grid;
  grid-template-columns: 4.5rem minmax(15rem, 0.7fr) 1.3fr;
  align-items: center;
  gap: 1.5rem;
  min-height: 0;
  padding: 1rem 1.25rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.value-card .step, .platform-points span {
  display: block;
  margin-bottom: 0;
  color: var(--blue);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.value-card h3, .platform-points h3 { margin: 0; font-size: 1.08rem; line-height: 1.35; }
.value-card p, .platform-points p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.value-card-result { color: var(--white); background: var(--blue); }
.value-card-result .step, .value-card-result p { color: rgba(255,255,255,0.75); }

.next-section {
  max-width: none;
  padding-left: max(4vw, calc((100vw - 92rem) / 2 + 4vw));
  padding-right: max(4vw, calc((100vw - 92rem) / 2 + 4vw));
  color: var(--white);
  background: var(--ink);
}

.section-kicker { justify-content: space-between; margin-bottom: 0.65rem; }
.section-kicker p { color: #8fb0ff; }
.section-kicker span { color: #9aa6b7; font-size: 0.83rem; }
.next-section > h2 {
  max-width: none;
  font-size: clamp(2.25rem, 3.55vw, 3.5rem);
  white-space: nowrap;
}

.product-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; margin-top: 1.75rem; }
.future-product {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  min-height: 0;
  padding: clamp(1.35rem, 2vw, 2rem);
  border-radius: calc(var(--radius) + 0.35rem);
  color: var(--ink);
}
.future-child { background: #edf8fa; }
.future-senior { background: #eef2ff; }
.future-product > header { display: flex; justify-content: space-between; align-items: flex-start; }
.future-number { font-size: clamp(3rem, 4vw, 4rem); font-weight: 900; line-height: 0.85; letter-spacing: -0.07em; opacity: 0.12; }
.future-product .product-type { margin-top: 1.25rem; }
.future-product h3 { max-width: none; margin: 0.35rem 0 0.6rem; font-size: clamp(1.9rem, 2.7vw, 2.8rem); line-height: 1.05; letter-spacing: -0.05em; }
.product-summary { max-width: 31rem; margin: 0; color: var(--muted); font-size: 1rem; }
.benefit-list { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; align-self: end; margin-top: 1.5rem; padding-top: 1.1rem; border-top: 1px solid rgba(16, 24, 40, 0.14); }
.benefit-list h4 { margin: 0 0 0.85rem; font-size: 0.85rem; }
.benefit-list ul { margin: 0; padding: 0; list-style: none; color: var(--muted); font-size: 0.88rem; }
.benefit-list li + li { margin-top: 0.55rem; }
.safety-note { margin: 1.25rem 0 0; padding-top: 0.8rem; border-top: 1px solid rgba(16, 24, 40, 0.14); color: #6b4c26; font-size: 0.8rem; }

.platform-section { display: grid; grid-template-columns: 0.9fr 1.3fr; gap: clamp(2rem, 4vw, 4rem); }
.platform-intro h2 { margin: 0.35rem 0 0.75rem; font-size: clamp(2rem, 3.3vw, 3.3rem); white-space: nowrap; }
.platform-intro > p:last-child { max-width: 35rem; margin: 0; color: var(--muted); }
.platform-points { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.platform-points article { padding: 1rem 1.1rem; border-left: 1px solid var(--line); }
.platform-points span { margin-bottom: 0.75rem; }
.platform-points h3 { margin-bottom: 0.35rem; }

footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 2rem;
  padding: 3rem 4vw;
  color: #d9e0eb;
  background: #09101e;
}
.footer-brand { color: var(--white); }
footer p { margin: 0.75rem 0 0; color: #8995a7; font-size: 0.83rem; }
footer > p { text-align: right; }

@media (max-width: 1050px) {
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-copy { max-width: 50rem; }
  .prototype-card { max-width: 50rem; }
  .section-heading { align-items: flex-start; flex-direction: column; gap: 0.5rem; }
  .section-heading h2, .next-section > h2 { white-space: normal; }
  .platform-section { grid-template-columns: 1fr; }
  .platform-intro h2 { white-space: normal; }
}

@media (max-width: 760px) {
  .site-header { grid-template-columns: 1fr auto; padding: 0 1.2rem; }
  nav { display: none; }
  .back-link { display: none; }
  .hero, .value-section, .platform-section { padding-left: 1.2rem; padding-right: 1.2rem; }
  .next-section { padding-left: 1.2rem; padding-right: 1.2rem; }
  .hero { gap: 2rem; padding-top: 1.5rem; padding-bottom: 2rem; }
  h1 { max-width: none; font-size: clamp(2.75rem, 13vw, 3.6rem); }
  .section-heading h2,
  .next-section > h2,
  .platform-intro h2 {
    white-space: normal;
    overflow-wrap: anywhere;
  }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 1rem; }
  .spec-strip { grid-template-columns: repeat(2, 1fr); gap: 1.2rem; }
  .prototype-card::before { right: 0; }
  .prototype-card figcaption { flex-direction: column; gap: 0.15rem; }
  .section-heading { grid-template-columns: 1fr; }
  .value-card { grid-template-columns: 2.5rem 1fr; gap: 0.35rem 0.8rem; padding: 0.85rem 1rem; }
  .value-card p { grid-column: 2; }
  .product-pair { grid-template-columns: 1fr; }
  .future-product { min-height: auto; }
  .benefit-list { grid-template-columns: 1fr; }
  .platform-points { grid-template-columns: 1fr; }
  .platform-points article { min-height: 12rem; border-bottom: 1px solid var(--line); }
  .platform-points span { margin-bottom: 2.3rem; }
  footer { align-items: flex-start; flex-direction: column; }
  footer > p { text-align: left; }
}

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