:root {
  color-scheme: light;
  --canvas: #fafcfb;
  --ink: #112c28;
  --secondary: #4e625d;
  --accent: #0f766e;
  --accent-hover: #115e59;
  --soft: #e6f1ed;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 18px;
  line-height: 1.8;
  color: var(--ink);
  background: var(--canvas);
  -webkit-text-size-adjust: 100%;
}
* { box-sizing: border-box; }
body { margin: 0; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 6px; }
::selection { background: #b9ded2; color: var(--ink); }
.container { width: min(100% - 96px, 1080px); margin-inline: auto; }
.header-divider { border-bottom: 1px solid #dce6e1; }
.site-header { width: min(100% - 64px, 1240px); margin-inline: auto; min-height: 104px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.site-name { display: inline-flex; align-items: center; gap: 8px; font-size: 21px; font-weight: 650; letter-spacing: -.02em; }
.site-logo { display: block; width: 44px; height: 44px; flex-shrink: 0; }
.site-header nav { display: flex; align-items: center; gap: 36px; font-size: 14px; }
.site-header nav a, .footer-bottom nav a { padding-block: 12px; }
section { scroll-margin-top: 32px; }
h1, h2, h3, p { margin: 0; }
h1 { font-size: clamp(42px, 4.5vw, 64px); font-weight: 600; line-height: 1.24; letter-spacing: -.045em; }
h2 { font-size: 38px; font-weight: 600; line-height: 1.4; letter-spacing: -.03em; }
h3 { font-size: 21px; font-weight: 600; line-height: 1.6; }
p { color: var(--secondary); }
.hero { padding-top: 44px; }
.hero-intro { display: grid; grid-template-columns: 1.2fr 1fr; gap: 64px; align-items: end; }
.hero-aside { padding-bottom: 5px; }
.hero-copy { font-size: 18px; line-height: 1.85; max-width: 425px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 24px; margin-top: 24px; }
.button, .download-pending { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; padding: 10px 24px; font-size: 18px; font-weight: 600; border-radius: 999px; }
.button { background: var(--accent); color: #fff; }
.button:hover { background: var(--accent-hover); color: #fff; }
.download-pending { background: var(--ink); color: #fff; }
.text-link { font-size: 14px; }
.platform-note { margin-top: 12px; font-size: 14px; }
.app-showcase { margin: 44px 0 0; padding: 28px 28px 16px; background: #dcece5; }
.app-showcase a { display: block; }
.app-showcase img { display: block; width: 100%; height: auto; border-radius: 10px; }
figcaption { font-size: 14px; line-height: 1.6; color: var(--secondary); }
.app-showcase figcaption { margin-top: 14px; text-align: center; }
.example-section { padding-top: 116px; padding-bottom: 112px; }
.section-heading { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: end; }
.section-heading > p { max-width: 440px; }
.review-layout { display: grid; grid-template-columns: 1.1fr 1fr; gap: 36px; align-items: stretch; margin-top: 40px; }
.review-image { margin: 0; min-width: 0; display: flex; flex-direction: column; justify-content: center; background: #e8efec; padding: 24px; }
.review-image a { display: block; }
.review-image img { display: block; width: 100%; height: auto; }
.review-image figcaption { margin-top: 18px; }
.practice-example { margin: 0; padding: 30px; background: #f0f4f1; min-width: 0; }
.practice-example figcaption { margin-bottom: 18px; }
.example-question { font-size: 21px; line-height: 1.6; color: var(--ink); font-weight: 600; }
.example-answer { margin-top: 22px; line-height: 1.95; }
mark { background: #cde5db; color: #17493e; padding: 2px 3px; }
summary { cursor: pointer; font-weight: 600; padding-block: 14px; }
summary::marker { color: var(--accent); }
.example-detail { margin-top: 18px; }
.example-feedback { padding-top: 8px; }
.example-feedback p + p { margin-top: 16px; }
.example-feedback strong { color: var(--ink); }
.practice-section { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; padding-bottom: 112px; }
.practice-steps { list-style: none; padding: 0; margin: 0; }
.practice-steps li + li { margin-top: 30px; }
.practice-steps p { margin-top: 9px; }
.questions-section { display: block; padding-bottom: 112px; }
.questions { display: grid; gap: 32px; }
.question-item h2 { font-size: 21px; font-weight: 600; line-height: 1.6; letter-spacing: normal; }
.questions p { margin-top: 12px; font-size: 18px; }
.download-section { background: #dcece5; }
.download-inner { padding-block: 64px; display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.download-inner h2 { font-size: 38px; }
.download-inner h2 + p { margin-top: 20px; }
.download-action { text-align: center; }
.site-footer { background: #f0f4f1; }
.footer-inner { width: min(100% - 96px, 1080px); margin-inline: auto; padding: 28px 0; }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 24px; font-size: 14px; }
.footer-bottom nav { display: flex; flex-wrap: wrap; gap: 24px; white-space: nowrap; }
.skip-link { position: absolute; top: -100px; left: 24px; background: #fff; padding: 10px 18px; z-index: 1; }
.skip-link:focus { top: 12px; }
@media (max-width: 1000px) {
  .hero-intro { grid-template-columns: 1fr 1fr; gap: 32px; }
  h1 { font-size: clamp(34px, 4.7vw, 46px); }
  .section-heading, .practice-section, .questions-section { gap: 40px; }
  .review-layout { gap: 20px; }
  .practice-example { padding: 24px; }
  .review-image { padding: 16px; }
  .footer-bottom { flex-wrap: wrap; gap: 12px; }
}
@media (max-width: 700px) {
  .container, .footer-inner { width: calc(100% - 48px); }
  .site-header { width: calc(100% - 32px); min-height: 90px; flex-wrap: wrap; gap: 8px 16px; padding-block: 18px; }
  .site-name { font-size: 18px; }
  .site-logo { width: 40px; height: 40px; }
  .site-header nav { gap: 20px; font-size: 14px; }
  .hero { padding-top: 28px; }
  .hero-intro, .section-heading, .review-layout, .practice-section, .questions-section { grid-template-columns: 1fr; gap: 26px; }
  h1 { font-size: clamp(32px, 8.7vw, 46px); }
  h2 { font-size: 30px; }
  .hero-copy { font-size: 18px; }
  .hero-actions { margin-top: 22px; gap: 20px; }
  .app-showcase { margin-top: 32px; padding: 12px 12px 10px; }
  .app-showcase img { border-radius: 4px; }
  .app-showcase figcaption { margin-top: 10px; }
  .example-section { padding-top: 72px; padding-bottom: 72px; }
  .review-layout { margin-top: 28px; gap: 18px; }
  .review-image { padding: 20px; }
  .practice-section, .questions-section { padding-bottom: 72px; gap: 28px; }
  .download-inner { padding-block: 44px; flex-direction: column; align-items: flex-start; gap: 28px; }
  .download-inner h2 { font-size: 32px; }
  .download-action { text-align: left; }
  .footer-inner { padding-top: 32px; }
  .footer-bottom { align-items: flex-start; flex-direction: column; gap: 12px; }
  .footer-bottom p { max-width: 100%; overflow-wrap: anywhere; }
}
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
  .button { transition: background-color 150ms ease; }
}

/* 权益与交付沿用官网现有字号、留白和色板。 */
.membership-section { padding-bottom: 112px; }
.membership-table { width: 100%; margin-top: 32px; border-collapse: collapse; table-layout: fixed; text-align: left; font-size: 18px; }
.membership-table caption { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.membership-table th, .membership-table td { padding: 18px 20px; vertical-align: top; overflow-wrap: anywhere; }
.membership-table th { font-weight: 600; }
.membership-table thead th:first-child { width: 28%; }
.membership-table tbody tr:nth-child(odd) { background: var(--soft); }
.membership-table td { color: var(--secondary); }
.membership-shared { margin-top: 24px; max-width: 72ch; }
.purchase-guidance { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; margin-top: 48px; }
.purchase-guidance p { margin-top: 16px; }
.support-contact { overflow-wrap: anywhere; }
.support-contact a { color: var(--accent); text-decoration: underline; text-underline-offset: .2em; }
@media (max-width: 1000px) { .purchase-guidance { gap: 40px; } }
@media (max-width: 700px) {
  .membership-section { padding-bottom: 72px; }
  .membership-table { font-size: 16px; line-height: 1.65; margin-top: 26px; }
  .membership-table th, .membership-table td { padding: 14px 8px; }
  .membership-table thead th:first-child { width: 27%; }
  .purchase-guidance { grid-template-columns: 1fr; gap: 32px; margin-top: 32px; }
}

/* 独立栏目沿用官网既有版式与色板。 */
body { min-height: 100svh; display: flex; flex-direction: column; }
main { flex: 1; }
.home-page { padding-bottom: 80px; }
.subpage { padding-top: 56px; }
.subpage h1 { font-size: 38px; line-height: 1.4; letter-spacing: -.03em; }
.subpage .example-section { padding-top: 0; }
.download-page { display: flex; padding-top: 0; }
.download-page .download-section { width: 100%; display: flex; align-items: center; }
.site-header nav a[aria-current="page"] { color: var(--accent); text-decoration: underline; text-underline-offset: .5em; }
@media (max-width: 700px) {
  .home-page { padding-bottom: 56px; }
  .subpage { padding-top: 32px; }
  .subpage h1 { font-size: 30px; }
  .download-page { padding-top: 0; }
  .site-header nav { flex-wrap: wrap; gap: 4px 20px; }
}

.practice-steps h2, .purchase-guidance h2 { font-size: 21px; font-weight: 600; line-height: 1.6; letter-spacing: normal; }

/* 首屏下载入口始终放在页头的主要操作位。 */
.site-header nav { margin-left: auto; }
.header-download { flex-shrink: 0; min-height: 44px; padding: 8px 22px; font-size: 16px; white-space: nowrap; }
.header-download[aria-current="page"] { background: var(--accent-hover); }
@media (max-width: 700px) {
  .site-header { gap: 8px 12px; }
  .site-name { order: 1; }
  .header-download { order: 2; margin-left: auto; min-height: 40px; padding: 8px 12px; font-size: 14px; }
  .site-header nav { order: 3; width: 100%; margin-left: 0; }
}

.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.questions-section .questions { max-width: 800px; }
.product-gallery { display: grid; gap: 80px; padding-top: 96px; }
.product-screen { margin: 0; min-width: 0; }
.product-screen figcaption { display: flex; align-items: baseline; justify-content: space-between; gap: 32px; margin-bottom: 24px; }
.product-screen figcaption h2 { font-size: 30px; color: var(--ink); }
.product-screen figcaption p { max-width: 430px; font-size: 18px; }
.product-screen > a { display: block; padding: 20px; background: var(--soft); }
.product-screen img { display: block; width: 100%; height: auto; }
.screenshot-note { margin-top: 12px; font-size: 14px; text-align: center; }
@media (max-width: 700px) {
  .product-gallery { padding-top: 56px; gap: 48px; }
  .product-screen figcaption { display: block; margin-bottom: 20px; }
  .product-screen figcaption h2 { font-size: 26px; }
  .product-screen figcaption p { margin-top: 12px; }
  .product-screen > a { padding: 10px; }
}

.button-secondary { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.button-secondary:hover { background: var(--soft); color: var(--accent-hover); }
.download-platforms { display: flex; flex-wrap: wrap; gap: 28px; }
@media (max-width: 700px) {
  .hero-actions { gap: 12px; }
  .hero-actions .button { padding-inline: 14px; font-size: 14px; }
}