:root {
  color-scheme: light;
  --page: #f6f8fb;
  --surface: #ffffff;
  --surface-soft: #eef2f7;
  --text: #101827;
  --secondary: #647084;
  --muted: #9aa4b2;
  --line: #e3e8f0;
  --brand: #111827;
  --accent: #2563eb;
  --accent-soft: #eaf1ff;
  --danger: #c91f24;
  --radius: 8px;
  --shadow-soft: 0 18px 48px rgba(15, 23, 42, 0.1);
  --shadow-device: 0 28px 70px rgba(15, 23, 42, 0.16);
  font-family: "HarmonyOS Sans", "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  overflow-x: hidden;
}

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

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

.site-header {
  position: fixed;
  z-index: 20;
  top: 18px;
  left: 50%;
  width: min(1080px, calc(100% - 32px));
  height: 58px;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 10px 0 14px;
  border: 1px solid rgba(227, 232, 240, 0.9);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 10px 34px rgba(15, 23, 42, 0.08);
  transform: translateX(-50%);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: max-content;
  font-size: 16px;
  font-weight: 800;
}

.brand img,
.download > img {
  width: 34px;
  height: 34px;
  border-radius: 10px;
}

.nav {
  display: flex;
  justify-content: center;
  gap: 4px;
  margin-left: auto;
  color: var(--secondary);
  font-size: 14px;
}

.nav a,
.header-action,
.primary-button,
.secondary-button {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0 16px;
  white-space: nowrap;
}

.nav a:hover {
  background: var(--surface-soft);
  color: var(--text);
}

.header-action,
.primary-button {
  background: var(--brand);
  color: #ffffff;
  font-weight: 760;
}

.secondary-button {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  font-weight: 720;
}

.hero {
  width: min(1120px, calc(100% - 32px));
  min-height: 710px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 430px);
  align-items: center;
  gap: 72px;
  margin: 0 auto;
  padding: 106px 0 64px;
}

.hero-content {
  width: min(640px, 100%);
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

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

h1 {
  margin-bottom: 20px;
  font-size: clamp(54px, 7vw, 86px);
  line-height: 0.96;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 19px;
  line-height: 1.3;
}

.hero-copy {
  width: min(560px, 100%);
  margin-bottom: 30px;
  color: #485569;
  font-size: 20px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 26px;
}

.hero-actions .primary-button,
.hero-actions .secondary-button {
  min-height: 48px;
  padding: 0 22px;
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero-points span {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--secondary);
  padding: 0 14px;
  font-size: 14px;
  font-weight: 700;
}

.hero-visual {
  position: relative;
  min-height: 570px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.phone-frame {
  margin: 0;
  border: 1px solid rgba(203, 213, 225, 0.78);
  border-radius: 34px;
  background: var(--surface);
  box-shadow: var(--shadow-device);
  overflow: hidden;
}

.phone-frame img {
  width: 100%;
  aspect-ratio: 1828 / 2584;
  height: auto;
  object-fit: cover;
  object-position: top center;
}

.hero-phone {
  width: min(380px, 100%);
}

.intro,
.section,
.privacy,
.download,
.site-footer {
  width: min(1120px, calc(100% - 32px));
  margin-right: auto;
  margin-left: auto;
}

.intro {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  padding: 8px 0 72px;
}

.metric,
.feature,
.privacy,
.download {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.metric {
  min-height: 108px;
  padding: 22px;
}

.metric strong {
  display: block;
  margin-bottom: 10px;
  font-size: 25px;
  line-height: 1.12;
}

.metric span,
.section-heading p,
.feature p,
.privacy-list p,
.download p,
.site-footer {
  color: var(--secondary);
  line-height: 1.75;
}

.section {
  padding: 70px 0;
}

.section-heading {
  width: min(720px, 100%);
  margin-bottom: 28px;
}

.section-heading p {
  margin-bottom: 0;
  font-size: 17px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.feature {
  min-height: 230px;
  padding: 24px;
}

.feature img {
  width: 32px;
  height: 32px;
  margin-bottom: 28px;
}

.feature p {
  margin-bottom: 0;
  font-size: 15px;
}

.privacy {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 28px;
  margin-top: 28px;
  padding: 38px;
}

.privacy-list {
  display: grid;
  gap: 12px;
}

.privacy-list p {
  margin: 0;
  padding-left: 18px;
  border-left: 3px solid var(--accent);
}

.download {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 22px;
  margin-top: 16px;
  margin-bottom: 56px;
  padding: 28px;
}

.download > img {
  width: 62px;
  height: 62px;
  border-radius: 18px;
}

.download h2 {
  margin-bottom: 8px;
  font-size: clamp(28px, 4vw, 40px);
}

.download p {
  margin-bottom: 0;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 26px 0 42px;
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.footer-links {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 14px;
}

.policy-page {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
  padding: 128px 0 64px;
}

.policy {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
  padding: clamp(24px, 5vw, 54px);
}

.policy h1 {
  margin-bottom: 12px;
  font-size: clamp(36px, 6vw, 64px);
}

.policy h2 {
  margin-top: 40px;
  font-size: clamp(24px, 3vw, 32px);
}

.policy p,
.policy li {
  color: var(--secondary);
  font-size: 16px;
  line-height: 1.9;
}

.policy ul {
  margin: 0;
  padding-left: 22px;
}

.policy-meta {
  margin-bottom: 34px;
}

.policy-card {
  display: grid;
  gap: 6px;
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-soft);
  padding: 18px;
}

.policy-card p {
  margin: 0;
}

.policy-table {
  display: grid;
  margin: 18px 0 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.policy-table [role="row"] {
  display: grid;
  grid-template-columns: 1fr 1.1fr 1.05fr 1.5fr;
  border-bottom: 1px solid var(--line);
}

.policy-table [role="row"]:last-child {
  border-bottom: 0;
}

.policy-table strong,
.policy-table span {
  padding: 14px;
  color: var(--secondary);
  font-size: 14px;
  line-height: 1.65;
}

.policy-table strong {
  color: var(--text);
  background: var(--surface-soft);
}

.guide-page {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 128px 0 64px;
}

.guide-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 28px;
  align-items: stretch;
  margin-bottom: 18px;
}

.guide-hero > div,
.guide-summary,
.guide-section {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.guide-hero > div {
  padding: clamp(28px, 5vw, 54px);
}

.guide-hero h1 {
  margin-bottom: 18px;
  font-size: clamp(42px, 5.4vw, 62px);
  line-height: 1.05;
}

.guide-hero p {
  max-width: 720px;
  color: var(--secondary);
  font-size: 18px;
  line-height: 1.85;
}

.guide-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.guide-actions .primary-button,
.guide-actions .secondary-button {
  min-height: 46px;
}

.guide-summary {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 28px;
}

.guide-summary img {
  width: 72px;
  height: 72px;
  margin-bottom: auto;
  border-radius: 20px;
}

.guide-summary h2 {
  margin: 34px 0 12px;
  font-size: 28px;
}

.guide-summary p,
.guide-copy p,
.guide-heading p,
.guide-card p,
.guide-card li,
.faq-list dd,
.principle-grid span,
.slogan-list span,
.capability-list span {
  color: var(--secondary);
  line-height: 1.8;
}

.guide-section {
  margin-top: 18px;
  padding: clamp(24px, 5vw, 42px);
}

.guide-heading {
  max-width: 760px;
  margin-bottom: 24px;
}

.guide-heading h2 {
  margin-bottom: 12px;
  font-size: clamp(30px, 4vw, 46px);
}

.guide-copy {
  max-width: 880px;
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 22px;
}

.principle-grid article,
.guide-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-soft);
}

.principle-grid article {
  min-height: 130px;
  padding: 18px;
}

.principle-grid strong {
  display: block;
  color: var(--text);
  line-height: 1.55;
}

.principle-grid strong {
  margin-bottom: 10px;
  font-size: 20px;
}

.slogan-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.8fr);
  gap: 24px;
  align-items: end;
}

.slogan-panel .guide-heading {
  margin-bottom: 0;
}

.slogan-panel .guide-heading p:last-child {
  margin-bottom: 0;
  font-size: 18px;
}

.slogan-list {
  display: grid;
  gap: 10px;
}

.slogan-list span {
  display: block;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-soft);
  padding: 12px 16px;
  font-weight: 720;
}

.capability-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.capability-list article {
  min-height: 172px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-soft);
  padding: 20px;
}

.capability-list img {
  width: 30px;
  height: 30px;
  margin-bottom: 22px;
}

.capability-list strong {
  display: block;
  margin-bottom: 8px;
  color: var(--text);
  font-size: 19px;
}

.guide-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.guide-toc {
  position: sticky;
  top: 96px;
  display: grid;
  gap: 6px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-soft);
  padding: 10px;
}

.guide-toc a {
  border-radius: 999px;
  color: var(--secondary);
  padding: 9px 12px;
  font-size: 14px;
  font-weight: 720;
}

.guide-toc a:hover {
  background: var(--surface);
  color: var(--text);
}

.guide-content {
  display: grid;
  gap: 12px;
}

.guide-card {
  padding: 24px;
}

.guide-card h3 {
  font-size: 24px;
}

.guide-page h1,
.guide-page h2,
.guide-page h3,
.guide-page p,
.guide-page li,
.guide-page dd,
.guide-page strong,
.guide-page span {
  overflow-wrap: anywhere;
}

.guide-card ul {
  margin: 14px 0 0;
  padding-left: 22px;
}

.guide-card li + li {
  margin-top: 6px;
}

.faq-list {
  display: grid;
  gap: 16px;
  margin: 14px 0 0;
}

.faq-list dt {
  color: var(--text);
  font-weight: 800;
}

.faq-list dd {
  margin: 6px 0 0;
}

@media (max-width: 1040px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 44px;
    padding-top: 104px;
  }

  .hero-visual {
    min-height: auto;
  }

  .hero-phone {
    width: min(340px, 84vw);
  }

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

  .guide-hero,
  .guide-layout {
    grid-template-columns: 1fr;
  }

  .guide-toc {
    position: static;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .slogan-panel,
  .capability-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .site-header {
    top: 10px;
    width: calc(100% - 20px);
  }

  .nav {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-bottom: 56px;
  }

  h1 {
    font-size: clamp(48px, 16vw, 64px);
  }

  .hero-copy {
    font-size: 18px;
  }

  .intro,
  .feature-grid,
  .privacy,
  .download,
  .policy-table [role="row"],
  .principle-grid,
  .guide-toc {
    grid-template-columns: 1fr;
  }

  .policy-table strong,
  .policy-table span {
    padding: 12px 14px;
  }

  .privacy,
  .download {
    padding: 24px;
  }

  .download {
    justify-items: start;
  }

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

  .footer-links {
    justify-content: flex-start;
  }

  .guide-page {
    width: 100%;
    padding-top: 104px;
    padding-right: 16px;
    padding-left: 16px;
  }

  .guide-hero > div,
  .guide-summary,
  .guide-section,
  .guide-card {
    padding: 22px;
  }

  .guide-hero h1 {
    font-size: 40px;
  }

  .guide-hero p,
  .guide-copy p,
  .guide-heading p,
  .guide-card p,
  .guide-card li,
  .faq-list dd {
    font-size: 15px;
  }

  .guide-summary h2 {
    font-size: 25px;
  }
}