:root {
  --ink: #122436;
  --muted: #526779;
  --line: #d7e3eb;
  --paper: #f7fbfd;
  --white: #ffffff;
  --blue: #1483c7;
  --blue-dark: #096498;
  --sky: #dff3ff;
  --amber: #ffda78;
  --shadow: 0 18px 60px rgba(22, 72, 104, .11);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.65;
}
a { color: var(--blue-dark); text-underline-offset: 3px; }
a:hover { color: var(--blue); }
a:focus-visible, .button:focus-visible { outline: 3px solid var(--amber); outline-offset: 4px; }

.site-header {
  width: min(1260px, calc(100% - 40px));
  margin: 0 auto 20px;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); font-size: 1.1rem; font-weight: 800; text-decoration: none; letter-spacing: -.02em; }
.brand img { border-radius: 11px; box-shadow: 0 7px 20px rgba(10, 97, 151, .18); }
nav { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 2px 12px; font-size: .94rem; font-weight: 750; }
nav a { padding: 9px 5px; color: var(--muted); text-decoration: none; }
nav a[aria-current="page"] { color: var(--blue-dark); }

main { width: min(1260px, calc(100% - 40px)); margin: 0 auto; }
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(44px, 6vw, 68px) clamp(26px, 6vw, 68px);
  border: 1px solid #c8e2f1;
  border-radius: 30px;
  background: linear-gradient(135deg, var(--white) 0%, #eef9ff 64%, #d9f1ff 100%);
  box-shadow: var(--shadow);
}
.hero::after { content: "N"; position: absolute; right: -1.5rem; bottom: -11rem; color: rgba(20, 131, 199, .065); font-size: clamp(22rem, 45vw, 38rem); font-weight: 900; line-height: 1; pointer-events: none; }
.hero > * { position: relative; z-index: 1; max-width: 790px; }
.eyebrow, .section-label { margin: 0 0 16px; color: var(--blue-dark); font-size: .76rem; font-weight: 850; letter-spacing: .14em; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.08; letter-spacing: -.035em; }
h1 { margin: 0; max-width: 900px; font-size: clamp(2.35rem, 4vw, 3.75rem); }
h2 { margin: 0; font-size: clamp(1.65rem, 2.6vw, 2.65rem); }
h3 { margin: 0; font-size: 1.2rem; }
.lede { max-width: 760px; margin: 18px 0 0; color: var(--muted); font-size: clamp(1.02rem, 1.5vw, 1.2rem); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.button { display: inline-flex; min-height: 50px; align-items: center; justify-content: center; padding: 12px 20px; border: 1px solid transparent; border-radius: 12px; font-weight: 800; text-decoration: none; }
.button.primary { color: var(--white); background: var(--blue-dark); }
.button.primary:hover { color: var(--white); background: var(--blue); }
.button.secondary { color: var(--ink); background: rgba(255,255,255,.7); border-color: var(--line); }
.release-note { margin: 22px 0 0; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }

.content-section { display: grid; grid-template-columns: 1fr 1.25fr; gap: clamp(34px, 7vw, 86px); padding: 68px 0 52px; }
.prose { color: var(--muted); font-size: 1.08rem; }
.prose p:first-child { margin-top: 0; }
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { min-height: 210px; padding: 26px; border: 1px solid var(--line); border-radius: 20px; background: var(--white); box-shadow: 0 12px 35px rgba(20, 71, 103, .06); }
.card-number { display: block; margin-bottom: 28px; color: var(--blue); font-size: .74rem; font-weight: 850; letter-spacing: .12em; }
.card h2 { font-size: 1.55rem; }
.card p { margin: 18px 0 0; color: var(--muted); }
.callout, .support-strip { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; margin: 64px 0; padding: clamp(30px, 4vw, 46px); border-radius: 24px; background: var(--ink); color: var(--white); }
.callout .section-label, .support-strip .section-label { color: #78ccff; }
.callout > p, .support-strip > div:last-child > p { margin: 0; color: #c7d7e4; }

.article-shell, .article-shell.wide, .article-shell.narrow { max-width: none; }
.article-header { padding: clamp(24px, 3vw, 34px) 0 42px; }
.article-header h1 { font-size: clamp(2.35rem, 4vw, 3.75rem); }
.article-header.compact-header { padding-bottom: 38px; }
.download-box { display: flex; align-items: center; flex-wrap: wrap; gap: 16px; margin-top: 28px; }
.download-box span { color: var(--muted); font-size: .9rem; }
.warning-panel { padding: 34px; border: 1px solid var(--line); border-radius: 20px; background: var(--white); }
.warning-panel h2 { font-size: 1.7rem; }
.warning-panel li + li { margin-top: 8px; }
.steps { padding: 56px 0 10px; }
.steps > h2 { margin-bottom: 42px; }
.steps ol { margin: 0; padding: 0; list-style: none; }
.steps li { display: grid; grid-template-columns: 52px 1fr; gap: 20px; padding: 30px 0; border-top: 1px solid var(--line); }
.steps li > span { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 50%; background: var(--sky); color: var(--blue-dark); font-weight: 850; }
.steps p { margin: 10px 0 0; color: var(--muted); }
code { padding: .12em .38em; border-radius: 5px; background: #e9f1f6; color: #25445b; font-size: .9em; }
.support-strip { margin-top: 58px; }
.support-strip .button { margin-top: 18px; }
.policy-list section { padding: 28px 0; border-top: 1px solid var(--line); }
.policy-list h2 { font-size: 1.65rem; }
.policy-list p { margin: 14px 0 0; color: var(--muted); }
.draft-note { margin: 44px 0 70px; padding: 24px; border-left: 5px solid var(--amber); background: #fff8df; }
.draft-note p { margin: 6px 0 0; }

footer { width: min(1260px, calc(100% - 40px)); margin: 0 auto; padding: 30px 0 42px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; align-items: flex-start; gap: 30px; color: var(--muted); font-size: .84rem; }
footer p { max-width: 620px; margin: 0; }

.refund-strip, .refund-section, .limitation-box { display: grid; grid-template-columns: .9fr 1.2fr; gap: 44px; margin: 64px 0; padding: 36px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.refund-strip p, .limitation-box > p { margin: 0; color: var(--muted); }
.inline-links { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 14px; font-weight: 750; }
.feature-accordion { margin-bottom: 64px; border-top: 1px solid var(--line); }
.feature-accordion details { border-bottom: 1px solid var(--line); background: var(--white); }
.feature-accordion summary { display: grid; grid-template-columns: 30px .85fr 1.15fr; gap: 18px; align-items: center; padding: 22px 18px; cursor: pointer; color: var(--muted); list-style: none; }
.feature-accordion summary::-webkit-details-marker { display: none; }
.feature-accordion summary::before { content: "▸"; display: grid; width: 30px; height: 30px; place-items: center; color: var(--blue-dark); font-size: 2rem; line-height: 1; }
.feature-accordion details[open] summary::before { content: "▾"; }
.feature-accordion summary:hover { background: #f1f8fc; }
.feature-title { color: var(--ink); font-size: 1.18rem; font-weight: 820; }
.feature-detail { padding: 0 22px 24px calc(22px + 1.2rem); color: var(--muted); }
.feature-detail ul { columns: 2; column-gap: 42px; margin: 0; padding-left: 20px; }
.feature-detail li { break-inside: avoid; margin-bottom: 8px; }
.notice-box { margin: 38px 0 64px; padding: 22px 24px; border-left: 5px solid var(--blue); background: var(--sky); }
.notice-box p { margin: 6px 0 0; }
.pricing-card { display: grid; grid-template-columns: .85fr 1.15fr; gap: 46px; padding: 34px; border: 1px solid var(--line); border-radius: 18px; background: var(--white); box-shadow: var(--shadow); }
.pricing-card h2 { font-size: 1.45rem; }
.pricing-card p { color: var(--muted); }
.price { margin: 0; }
.price span { color: var(--ink); font-size: 3rem; font-weight: 850; letter-spacing: -.05em; }
.refund-section { margin-bottom: 72px; }
.install-flow { margin: 8px 0 64px; }
.flow-radio { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; }
.flow-tabs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; padding: 6px; border: 1px solid var(--line); border-radius: 16px; background: #eaf3f8; }
.flow-tabs label { display: flex; min-height: 58px; align-items: center; justify-content: center; padding: 10px 14px; border-radius: 11px; color: var(--muted); font-weight: 800; line-height: 1.25; text-align: center; cursor: pointer; }
.flow-tabs label:hover { background: rgba(255,255,255,.65); color: var(--ink); }
#flow-fresh:focus-visible ~ .flow-tabs label[for="flow-fresh"], #flow-update:focus-visible ~ .flow-tabs label[for="flow-update"], #flow-store:focus-visible ~ .flow-tabs label[for="flow-store"] { outline: 3px solid var(--amber); outline-offset: 3px; }
#flow-fresh:checked ~ .flow-tabs label[for="flow-fresh"], #flow-update:checked ~ .flow-tabs label[for="flow-update"], #flow-store:checked ~ .flow-tabs label[for="flow-store"] { color: var(--blue-dark); background: var(--white); box-shadow: 0 5px 18px rgba(20,71,103,.11); }
.flow-panels { margin-top: 24px; }
.flow-panel { display: none; padding: 30px; border: 1px solid var(--line); border-radius: 20px; background: var(--white); }
#flow-fresh:checked ~ .flow-panels .flow-fresh-panel, #flow-update:checked ~ .flow-panels .flow-update-panel, #flow-store:checked ~ .flow-panels .flow-store-panel { display: block; }
.flow-panel > header { margin-bottom: 8px; }
.flow-panel > header h2 { font-size: 1.8rem; }
.flow-panel > header p { max-width: 780px; margin: 10px 0 0; color: var(--muted); }
.flow-panel .steps { padding: 24px 0 0; }
.flow-panel .steps li:last-child { padding-bottom: 4px; }
.step-help { margin-top: 12px; }
.step-help summary { width: fit-content; cursor: pointer; color: var(--blue-dark); font-size: .9rem; font-weight: 750; }
.step-help p { margin-top: 9px; padding: 12px 14px; border-left: 3px solid #a9cee3; background: #f0f8fc; font-size: .92rem; }
.step-download { display: flex; flex-wrap: wrap; gap: 12px 16px; align-items: center; margin: 16px 0 4px; }
.step-download span { color: var(--muted); font-size: .86rem; }
.step-image { display: block; width: min(920px, 100%); height: auto; margin: 14px 0 20px; border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 8px 24px rgba(20,71,103,.09); }
.step-image-portrait { width: min(760px, 100%); }
.faq-group { margin-bottom: 52px; }
.faq-group > h2 { margin-bottom: 18px; font-size: 1.7rem; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); background: var(--white); }
.faq-list summary { display: grid; grid-template-columns: 30px 1fr; gap: 12px; align-items: center; padding: 20px 18px; cursor: pointer; color: var(--ink); font-weight: 800; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::before { content: "▸"; display: grid; width: 30px; height: 30px; place-items: center; color: var(--blue-dark); font-size: 2rem; line-height: 1; }
.faq-list details[open] summary::before { content: "▾"; }
.faq-list summary:hover { background: #f1f8fc; }
.faq-list details > div { padding: 0 22px 20px 60px; color: var(--muted); }
.faq-list details > div p { margin: 0; }
.home-screenshot { width: min(280px, 100%); margin-top: 24px; overflow: hidden; border: 1px solid var(--line); border-radius: 15px; background: var(--white); box-shadow: 0 10px 28px rgba(20,71,103,.09); }
.home-screenshot img { display: block; width: 100%; height: auto; }
.screenshot-gallery figure { margin: 0; }
.screenshot-gallery { margin: 8px 0 68px; }
.screenshot-gallery > header { margin-bottom: 24px; }
.screenshot-gallery > header p { max-width: 720px; margin: 12px 0 0; color: var(--muted); }
.screenshot-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; align-items: start; }
.screenshot-grid figure { overflow: hidden; border: 1px solid var(--line); border-radius: 20px; background: var(--white); box-shadow: 0 12px 35px rgba(20, 71, 103, .07); }
.screenshot-grid img { display: block; width: 100%; height: auto; }
.screenshot-gallery figcaption { padding: 12px 14px; color: var(--ink); font-size: .88rem; font-weight: 800; }
.release-history { margin: 4px 0 72px; border-top: 1px solid var(--line); }
.release-entry { padding: 34px 0; border-bottom: 1px solid var(--line); }
.release-entry > header { display: flex; align-items: flex-start; justify-content: space-between; gap: 28px; }
.release-entry h2 { font-size: 1.9rem; }
.release-entry time { flex: 0 0 auto; padding-top: 4px; color: var(--muted); font-size: .9rem; font-weight: 750; }
.release-entry > p { max-width: 900px; margin: 16px 0 0; color: var(--muted); }
.release-technical { max-width: 900px; margin-top: 18px; }
.release-technical summary { width: fit-content; cursor: pointer; color: var(--blue-dark); font-size: .9rem; font-weight: 750; }
.release-technical div { margin-top: 10px; padding: 16px 18px; border-left: 3px solid #a9cee3; background: #f0f8fc; color: var(--muted); }
.release-technical p { margin: 0; overflow-wrap: anywhere; }
.release-technical p + p { margin-top: 8px; }

@media (max-width: 800px) {
  .site-header { align-items: flex-start; padding: 20px 0; }
  nav { justify-content: flex-end; flex-wrap: wrap; gap: 10px 18px; }
  .content-section, .callout, .support-strip, .refund-strip, .refund-section, .limitation-box, .pricing-card { grid-template-columns: 1fr; gap: 28px; }
  .content-section { padding: 80px 0 60px; }
  .card-grid { grid-template-columns: 1fr; }
  .screenshot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .feature-accordion summary { grid-template-columns: 30px 1fr; gap: 4px 12px; }
  .feature-accordion summary > span:last-child { grid-column: 2; }
  .feature-detail ul { columns: 1; }
  .release-entry > header { flex-direction: column; gap: 8px; }
  .card { min-height: auto; }
  .card-number { margin-bottom: 34px; }
  footer { flex-direction: column; }
}

@media (max-width: 540px) {
  body { font-size: 16px; }
  .site-header { width: min(100% - 28px, 1260px); flex-direction: column; }
  nav { justify-content: flex-start; }
  main, footer { width: min(100% - 28px, 1260px); }
  .hero { padding: 58px 22px; border-radius: 20px; }
  .hero h1, .article-header h1 { font-size: 2.5rem; }
  .actions .button { width: 100%; }
  .status-box { align-items: flex-start; flex-direction: column; }
  .warning-panel { padding: 24px; }
  .flow-tabs { grid-template-columns: 1fr; }
  .flow-tabs label { min-height: 46px; }
  .flow-panel { padding: 22px 18px; }
  .step-image, .step-image-portrait { width: 100%; border-radius: 9px; }
  .steps li { grid-template-columns: 42px 1fr; gap: 14px; }
  .callout, .support-strip { margin: 72px 0; padding: 28px 24px; }
}

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