/* 极简官网：以文字层级、真实画面与留白建立结构。 */
:root {
  --ink: #202428;
  --muted: #62686e;
  --blue: #225aa5;
  --line: #e9ebed;
  color-scheme: light;
}
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body { background: #fff; color: var(--ink); font-family: "Segoe UI", Arial, sans-serif; line-height: 1.7; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { font-weight: 600; letter-spacing: -.035em; }
a { color: var(--blue); text-underline-offset: 4px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--blue); outline-offset: 6px; border-radius: 2px; }
.container { width: min(1000px, calc(100% - 96px)); margin-inline: auto; }
.skip-link { position: fixed; left: 20px; top: -100px; background: #fff; padding: 12px 20px; z-index: 10; }
.skip-link:focus { top: 12px; }
.site-header { border-bottom: 1px solid var(--line); }
.header-inner { min-height: 96px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; gap: 10px; align-items: center; color: var(--ink); text-decoration: none; font-size: 14px; font-weight: 600; line-height: 1.35; }
.brand img { width: 36px; height: 36px; border-radius: 6px; }
.brand-second { display: block; color: var(--muted); font-size: 12px; font-weight: 400; margin-top: 2px; }
.main-nav { display: flex; gap: 32px; align-items: center; }
.main-nav a { padding-block: 10px; color: var(--muted); text-decoration: none; font-size: 13px; }
.main-nav a:hover { color: var(--ink); }
.hero { display: grid; grid-template-columns: 1.2fr 1fr; gap: 64px; align-items: center; padding-block: 64px 72px; }
h1 { font-size: clamp(40px, 4.3vw, 60px); line-height: 1.1; letter-spacing: -.045em; }
.lead { font-size: 18px; line-height: 1.8; color: var(--muted); max-width: 425px; margin-top: 24px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 12px 24px; background: var(--blue); border: 1px solid var(--blue); border-radius: 5px; color: #fff; text-decoration: none; font-size: 14px; font-weight: 600; transition: background-color .2s; }
.button:hover { background: #184681; border-color: #184681; }
.hero .button { margin-top: 32px; }
.availability { font-size: 12px; color: var(--muted); margin-top: 12px; }
.product-visual { display: flex; flex-direction: column; align-items: center; min-width: 0; }
.screen-link { display: block; border-radius: 12px; }
.phone-screen { width: 232px; max-width: 100%; border: 1px solid #e3e6ea; border-radius: 12px; }
.product-visual figcaption { color: var(--muted); font-size: 11px; margin-top: 16px; text-align: center; line-height: 1.6; }
.product-visual figcaption a { color: inherit; }
h2 { font-size: 36px; line-height: 1.2; }
.comparison-section { border-top: 1px solid var(--line); padding-block: 56px 64px; }
.comparison-section h2 { font-size: 28px; }
.feature-columns { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px; margin-top: 32px; }
.feature-columns h3 { font-size: 16px; letter-spacing: -.015em; }
.feature-columns p { font-size: 14px; line-height: 1.85; color: var(--muted); margin-top: 12px; }
.feature-row { display: grid; grid-template-columns: 1.2fr 1fr; gap: 64px; align-items: center; padding-block: 64px; border-top: 1px solid var(--line); }
.feature-copy { max-width: 410px; }
.feature-copy > p { font-size: 16px; line-height: 1.85; color: var(--muted); margin-top: 20px; }
.template-section .feature-copy { grid-column: 2; grid-row: 1; }
.template-section .product-visual { grid-column: 1; grid-row: 1; }
.template-section { grid-template-columns: 1fr 1.2fr; }
.text-link { display: inline-block; font-size: 14px; font-weight: 600; text-decoration: none; }
.text-link:hover { text-decoration: underline; }
.report-section .text-link { margin-top: 24px; }
.feature-copy > p.sample-note { font-size: 12px; margin-top: 10px; }
.report-link { display: block; width: 330px; max-width: 100%; border: 1px solid var(--line); }
.report-link img { width: 100%; }
.site-footer { margin-top: 16px; padding-block: 32px 28px; border-top: 1px solid var(--line); }
.footer-inner { display: flex; justify-content: space-between; align-items: baseline; gap: 24px; }
.footer-inner > p { color: var(--muted); font-size: 12px; }
.footer-inner nav { display: flex; flex-wrap: wrap; gap: 24px; }
.footer-inner nav a { color: var(--muted); font-size: 12px; text-decoration: none; }
.footer-inner nav a:hover { color: var(--ink); text-decoration: underline; }
.photo-credit { font-size: 11px; color: var(--muted); margin-top: 16px; }
.photo-credit a { color: inherit; }
.document-main { max-width: 720px; min-height: 65vh; padding-block: 64px 80px; }
.document-main h1 { font-size: 40px; }
.document-main .intro { color: var(--muted); font-size: 18px; line-height: 1.8; margin-top: 20px; margin-bottom: 40px; }
.document-main h2 { font-size: 24px; margin-top: 40px; margin-bottom: 16px; }
.document-main p { color: var(--muted); line-height: 1.85; margin-top: 16px; }
.document-main .button { margin-top: 24px; }
.document-main a { overflow-wrap: anywhere; }
.support-links { display: flex; flex-wrap: wrap; gap: 16px 24px; margin-top: 20px; }
.license-list { display: flex; flex-wrap: wrap; gap: 16px 24px; margin-top: 20px; }
.license-list a { font-size: 14px; }
.faq-list { margin-top: 24px; }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list details:first-child { border-top: 1px solid var(--line); }
.faq-list summary { cursor: pointer; padding: 20px 0; color: var(--ink); font-size: 15px; font-weight: 500; }
.faq-list summary::marker { color: var(--muted); }
.faq-list details p { margin-top: 0; padding-bottom: 24px; font-size: 14px; }
/* 次级页面沿用同一组文字与页尾间距。 */
.footer-bottom { display: flex; gap: 24px; justify-content: space-between; color: var(--muted); font-size: 12px; }
.footer-bottom a { color: inherit; }
@media (max-width: 900px) {
  .container { width: calc(100% - 64px); }
  .hero, .feature-row { gap: 40px; }
  h1 { font-size: 46px; }
  h2 { font-size: 32px; }
  .lead { font-size: 17px; }
  .feature-columns { gap: 32px; }
  .phone-screen { width: 216px; }
  .footer-inner { flex-direction: column; gap: 16px; }
}
@media (max-width: 640px) {
  html { scroll-padding-top: 20px; }
  .container { width: calc(100% - 48px); }
  .header-inner { min-height: 92px; gap: 12px; flex-wrap: wrap; padding-block: 16px; }
  .brand { font-size: 13px; }
  .brand-second { font-size: 11px; }
  .brand img { width: 32px; height: 32px; }
  .main-nav { gap: 20px; }
  .main-nav a { font-size: 12px; }
  .hero { grid-template-columns: 1fr; gap: 40px; padding-block: 48px; }
  .hero-copy { max-width: 440px; }
  h1 { font-size: 44px; }
  .lead { font-size: 16px; margin-top: 20px; max-width: 390px; }
  .hero .button { margin-top: 24px; }
  .phone-screen { width: 224px; }
  .product-visual figcaption { font-size: 11px; }
  .comparison-section { padding-block: 40px; }
  .comparison-section h2 { font-size: 27px; }
  .feature-columns { grid-template-columns: 1fr; gap: 24px; margin-top: 28px; }
  .feature-columns p { margin-top: 8px; max-width: 420px; }
  .feature-row { grid-template-columns: 1fr; gap: 32px; padding-block: 48px; }
  .feature-copy { max-width: 440px; }
  h2 { font-size: 31px; }
  .feature-copy > p { font-size: 15px; margin-top: 16px; }
  .template-section .feature-copy, .template-section .product-visual { grid-column: auto; grid-row: auto; }
  .report-link { width: 300px; }
  .site-footer { margin-top: 0; padding-block: 28px; }
  .footer-inner nav { gap: 14px 22px; }
  .document-main { padding-block: 40px 56px; }
  .document-main h1 { font-size: 34px; }
  .document-main .intro { font-size: 16px; margin-bottom: 32px; }
  .document-main p { font-size: 15px; }
  .footer-bottom { flex-wrap: wrap; gap: 12px; }
}
@media (max-width: 480px) {
  .header-inner { align-items: flex-start; flex-direction: column; gap: 12px; }
  .main-nav { gap: 28px; }
  .main-nav a { padding-block: 4px; min-height: 32px; }
  h1 { font-size: 40px; }
  .container { width: calc(100% - 40px); }
}
@media (max-width: 350px) {
  h1 { font-size: 35px; }
  h2 { font-size: 28px; }
  .main-nav { gap: 24px; }
  .document-main h1 { font-size: 30px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}
@media print {
  .site-header, .site-footer, .skip-link, .hero .button { display: none; }
  .container { width: 100%; }
  .hero, .feature-row { break-inside: avoid; padding-block: 24px; }
  a { color: inherit; }
}