:root {
  color-scheme: light;
  --surface: #f8fbfd;
  --surface-strong: #edf6fb;
  --surface-soft: #e1eef5;
  --ink: #162531;
  --muted: #587080;
  --line: #cddde6;
  --brand: #008ad4;
  --brand-dark: #006fa8;
  --green: #94c816;
  --yellow: #f5ba03;
  --danger: oklch(0.55 0.16 28);
  --shadow: 0 18px 60px rgb(0 70 112 / 0.14);
  --radius: 8px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: "Aptos", "Segoe UI Variable", "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

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

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

p {
  margin: 0;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.15;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(2.45rem, 3.8vw, 4.2rem);
  max-width: 12ch;
}

h2 {
  font-size: clamp(1.75rem, 3vw, 3rem);
  max-width: 16ch;
}

h3 {
  font-size: 1.04rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(18px, 4vw, 44px);
  background: oklch(0.985 0.007 180 / 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: max-content;
  font-weight: 760;
}

.brand-logo {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  box-shadow: 0 8px 20px rgb(0 138 212 / 0.16);
}

.brand-text {
  font-size: 1.02rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav a {
  padding: 9px 12px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 650;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a.active {
  background: var(--surface-strong);
  color: var(--ink);
  outline: none;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 11px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: var(--ink);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 1.05fr);
  gap: clamp(28px, 6vw, 86px);
  align-items: center;
  max-width: 1320px;
  margin: 0 auto;
  padding: clamp(54px, 7vw, 96px) clamp(18px, 4vw, 44px) clamp(42px, 6vw, 80px);
}

.hero-copy {
  display: grid;
  gap: 24px;
}

.eyebrow,
.section-kicker {
  color: var(--brand-dark);
  font-size: 0.78rem;
  font-weight: 820;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-lede,
.page-hero p,
.band-copy p,
.dense-copy,
.source-list p,
.guide-panels p,
.download-card p,
.feature-item p,
.capability-list p,
.faq-list p,
.usecase-list p {
  color: var(--muted);
}

.hero-lede {
  max-width: 62ch;
  font-size: 1.08rem;
}

.hero-actions,
.band-actions,
.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 760;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button:focus-visible,
.text-link:focus-visible,
.modal-close:focus-visible {
  outline: 3px solid oklch(0.78 0.12 176 / 0.55);
  outline-offset: 2px;
}

.button-primary {
  background: var(--brand);
  color: #f8fbfd;
}

.button-primary:hover {
  background: var(--brand-dark);
}

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

.text-link {
  color: var(--brand-dark);
  font-weight: 780;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  max-width: 620px;
  margin: 6px 0 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.hero-facts div {
  padding: 16px;
  background: var(--surface-strong);
}

.hero-facts dt {
  color: var(--muted);
  font-size: 0.78rem;
}

.hero-facts dd {
  margin: 4px 0 0;
  font-weight: 780;
}

.hero-visual {
  position: relative;
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: 9% -2% auto 16%;
  height: 70%;
  background: rgb(0 138 212 / 0.18);
  filter: blur(38px);
  z-index: -1;
}

.hero-visual img {
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.trust-strip {
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px clamp(18px, 4vw, 36px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(56px, 8vw, 96px) clamp(18px, 4vw, 36px);
}

.section-heading {
  display: grid;
  gap: 12px;
  margin-bottom: 28px;
}

.section-split {
  display: grid;
  grid-template-columns: minmax(220px, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: start;
}

.dense-copy {
  display: grid;
  gap: 16px;
  max-width: 68ch;
  font-size: 1.03rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.feature-item {
  display: grid;
  min-height: 250px;
  align-content: start;
  gap: 16px;
  padding: 24px;
  background: var(--surface);
}

.feature-number,
.capability-index,
.step-count {
  display: inline-flex;
  width: max-content;
  color: var(--brand-dark);
  font-weight: 820;
  font-size: 0.82rem;
}

.band {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  max-width: none;
  padding-left: max(clamp(18px, 4vw, 36px), calc((100vw - var(--max)) / 2 + 36px));
  padding-right: max(clamp(18px, 4vw, 36px), calc((100vw - var(--max)) / 2 + 36px));
  background: var(--surface-strong);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.band-copy {
  display: grid;
  gap: 12px;
}

.band-copy h2 {
  max-width: 18ch;
}

.usecase-list {
  display: grid;
  gap: 18px;
}

.usecase-list div {
  display: grid;
  gap: 8px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.page-hero {
  display: grid;
  gap: 18px;
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(54px, 7vw, 90px) clamp(18px, 4vw, 36px) 36px;
}

.page-hero.compact h1,
.download-hero h1 {
  max-width: 13ch;
}

.page-hero p {
  max-width: 66ch;
  font-size: 1.06rem;
}

.download-hero {
  padding-bottom: 18px;
}

.capability-list {
  display: grid;
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.capability-list article {
  display: grid;
  grid-template-columns: 72px minmax(180px, 0.55fr) minmax(0, 1fr);
  gap: 22px;
  align-items: start;
  padding: 26px;
  background: var(--surface);
}

.comparison-table {
  display: grid;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.table-row {
  display: grid;
  grid-template-columns: 0.8fr 1.3fr 1.1fr;
  gap: 1px;
  background: var(--line);
}

.table-row span {
  padding: 18px;
  background: var(--surface);
}

.table-head span {
  background: var(--brand);
  color: #f8fbfd;
  font-weight: 760;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.download-card {
  display: grid;
  gap: 18px;
  padding: clamp(24px, 4vw, 34px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 12px 40px oklch(0.22 0.02 182 / 0.06);
}

.download-label {
  width: max-content;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgb(148 200 22 / 0.18);
  color: #4d7100;
  font-size: 0.78rem;
  font-weight: 800;
}

.download-label.secondary {
  background: rgb(245 186 3 / 0.22);
  color: #725300;
}

.download-meta {
  display: grid;
  gap: 1px;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.download-meta div {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 14px;
  padding: 12px 14px;
  background: var(--surface-strong);
}

.download-meta dt {
  color: var(--muted);
}

.download-meta dd {
  margin: 0;
  font-weight: 760;
}

.qr-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.qr-box {
  display: grid;
  justify-items: start;
  gap: 12px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-strong);
}

.qr-box img {
  width: 180px;
  height: 180px;
  border: 10px solid #f8fbfd;
  border-radius: 8px;
}

.source-section {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 48px;
}

.source-list {
  display: grid;
  gap: 18px;
}

.source-list article,
.guide-panels article {
  display: grid;
  gap: 10px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.version-list {
  display: grid;
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.version-row {
  display: grid;
  grid-template-columns: 0.5fr 1.2fr 0.7fr;
  gap: 1px;
  background: var(--line);
}

.version-row span {
  padding: 16px;
  background: var(--surface);
}

.version-row span:first-child {
  font-weight: 800;
}

.step-list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
  list-style: none;
}

.step-list li {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 18px;
  padding: 24px;
  background: var(--surface);
}

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

.guide-panels {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.faq-list {
  display: grid;
  gap: 12px;
  max-width: 900px;
}

.faq-list details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.faq-list summary {
  cursor: pointer;
  padding: 18px 20px;
  font-weight: 780;
}

.faq-list p {
  padding: 0 20px 20px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  padding: 36px clamp(18px, 4vw, 44px);
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.site-footer div {
  max-width: 620px;
}

.site-footer strong {
  display: block;
  margin-bottom: 8px;
  color: var(--ink);
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-content: start;
  justify-content: flex-end;
  font-weight: 700;
}

.modal-root[hidden] {
  display: none;
}

.modal-root {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: grid;
  place-items: center;
  padding: 18px;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgb(18 37 49 / 0.54);
}

.download-modal {
  position: relative;
  width: min(720px, 100%);
  max-height: calc(100vh - 36px);
  overflow: auto;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.modal-head {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: start;
  margin-bottom: 18px;
}

.modal-head p {
  color: var(--muted);
  max-width: 55ch;
}

.modal-close {
  display: grid;
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-strong);
  color: var(--ink);
  cursor: pointer;
  font-size: 1.4rem;
  line-height: 1;
}

.modal-qr-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.modal-qr-card {
  display: grid;
  gap: 10px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-strong);
}

.modal-qr-card img {
  width: 160px;
  height: 160px;
  border: 10px solid #fff;
  border-radius: 8px;
}

.modal-note {
  margin-top: 16px;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 940px) {
  .hero,
  .section-split,
  .source-section {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 44px;
  }

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

  .capability-list article {
    grid-template-columns: 52px 1fr;
  }

  .capability-list article p {
    grid-column: 2;
  }

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

@media (max-width: 720px) {
  .site-header {
    align-items: flex-start;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 18px;
    right: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
  }

  h1 {
    font-size: 2.35rem;
    max-width: 15ch;
  }

  .hero-facts,
  .feature-grid,
  .download-grid,
  .qr-grid,
  .guide-panels,
  .modal-qr-grid {
    grid-template-columns: 1fr;
  }

  .table-row,
  .version-row {
    grid-template-columns: 1fr;
  }

  .table-head {
    display: none;
  }

  .download-meta div {
    grid-template-columns: 80px 1fr;
  }

  .step-list li {
    grid-template-columns: 1fr;
  }

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

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

  .download-modal {
    padding: 20px;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}