:root {
  color-scheme: dark;
  --bg: #050c1b;
  --surface: #0b1528;
  --raised: #101e34;
  --ink: #f3f6fb;
  --muted: #a4afc3;
  --line: #263248;
  --accent: #72e4ef;
  --accent-ink: #06252d;
  --soft: #b2a4ff;
  --shadow: 0 24px 90px #0005;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:
    Inter,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "PingFang SC",
    "Microsoft YaHei",
    sans-serif;
  font-size: 16px;
  line-height: 1.7;
}
body[data-theme="light"] {
  color-scheme: light;
  --bg: #f7f8fa;
  --surface: #fff;
  --raised: #edf2f7;
  --ink: #142238;
  --muted: #536378;
  --line: #d5deea;
  --accent: #007383;
  --accent-ink: #fff;
  --soft: #6253b8;
  --shadow: 0 24px 70px #152b4512;
}
a {
  color: inherit;
  text-underline-offset: 4px;
}
a:hover {
  color: var(--accent);
}
button,
input,
select {
  font: inherit;
}
button,
a,
select {
  touch-action: manipulation;
}
button,
select {
  cursor: pointer;
}
a:focus-visible,
button:focus-visible,
select:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 5px;
}
img {
  display: block;
  max-width: 100%;
  height: auto;
}
button {
  color: inherit;
}
p {
  margin: 0 0 1.1rem;
}
h1,
h2,
h3 {
  margin: 0;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.035em;
}
h1 {
  font-size: clamp(3rem, 5.6vw, 5.3rem);
  font-weight: 550;
}
h1 em,
h2 em {
  font-family: Georgia, "Songti SC", serif;
  color: var(--accent);
  font-weight: 400;
}
h2 {
  font-size: clamp(2rem, 3.7vw, 3.1rem);
}
h3 {
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}
ul,
ol {
  padding-left: 1.3rem;
}
li {
  margin: 0.55rem 0;
}
code {
  font-size: 0.86em;
  background: var(--raised);
  padding: 0.12rem 0.35rem;
  border-radius: 4px;
  overflow-wrap: anywhere;
}
.wrap {
  width: min(1200px, calc(100% - 64px));
  margin-inline: auto;
}
.skip {
  position: fixed;
  top: -60px;
  left: 20px;
  padding: 10px 20px;
  background: var(--accent);
  color: var(--accent-ink);
  z-index: 10;
}
.skip:focus {
  top: 10px;
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  min-height: 82px;
}
.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: -0.04em;
  white-space: nowrap;
}
.brand img {
  width: 39px;
  height: 39px;
  border-radius: 11px;
}
.nav {
  display: flex;
  align-items: center;
  gap: 1.65rem;
  margin-left: auto;
}
.nav a {
  font-size: 0.86rem;
  text-decoration: none;
  color: var(--muted);
  white-space: nowrap;
}
.nav a:hover {
  color: var(--ink);
}
.nav .locale {
  color: var(--ink);
  border-left: 1px solid var(--line);
  padding-left: 1.5rem;
}
.theme {
  display: grid;
  place-items: center;
  width: 35px;
  height: 35px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: transparent;
  font-size: 1.15rem;
}
.eyebrow {
  font-size: 0.71rem;
  letter-spacing: 0.15em;
  font-weight: 650;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1.1rem;
}
.hero {
  display: grid;
  grid-template-columns: 0.9fr 1.25fr;
  align-items: center;
  gap: 3rem;
  padding: 96px 0 68px;
}
.hero-copy > p:not(.eyebrow) {
  font-size: 1.07rem;
  color: var(--muted);
  margin: 1.6rem 0 0;
  max-width: 32rem;
}
html[lang="zh-CN"] .hero h1 {
  font-size: clamp(2.25rem, 4vw, 3.6rem);
}
.hero .fine {
  font-size: 0.74rem !important;
}
.actions {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 2rem;
}
.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  border: 1px solid var(--accent);
  padding: 12px 23px;
  border-radius: 6px;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 0.89rem;
  font-weight: 650;
  text-decoration: none;
  transition:
    transform 0.18s,
    box-shadow 0.18s;
}
.button:hover {
  color: var(--accent-ink);
  transform: translateY(-2px);
  box-shadow: 0 4px 22px color-mix(in srgb, var(--accent) 20%, transparent);
}
.text-link {
  font-size: 0.85rem;
}
.hero-media {
  min-width: 0;
}
.viewer-frame {
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  background: var(--surface);
}
.frame-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 17px;
  border-bottom: 1px solid var(--line);
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.live-dot {
  display: inline-block;
  height: 6px;
  width: 6px;
  background: var(--accent);
  border-radius: 50%;
  margin-right: 7px;
}
.hero-media a {
  display: block;
  overflow: hidden;
}
.hero-media img {
  width: 100%;
  aspect-ratio: 16/11;
  object-fit: cover;
  object-position: center 60%;
}
.caption {
  font-size: 0.74rem;
  color: var(--muted);
  line-height: 1.7;
  margin: 0.8rem 0 0;
}
.caption a {
  display: inline;
}
.capabilities {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  border-block: 1px solid var(--line);
  padding: 23px 0;
  font-size: 0.77rem;
  color: var(--muted);
  letter-spacing: 0.045em;
}
.capabilities strong {
  color: var(--ink);
  font-weight: 500;
}
.section {
  padding: 88px 0;
  border-bottom: 1px solid var(--line);
}
.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 3rem;
  margin-bottom: 2.6rem;
}
.section-head > p {
  max-width: 28rem;
  color: var(--muted);
  margin-bottom: 0;
}
.feature-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.8rem;
}
.feature-list article {
  padding-right: 1rem;
}
.number {
  font-family: Georgia, serif;
  color: var(--soft);
  font-size: 1.8rem;
  display: block;
  margin-bottom: 1.2rem;
}
.feature-list h3 {
  margin-bottom: 1rem;
}
.feature-list p {
  font-size: 0.93rem;
  color: var(--muted);
  margin: 0;
}
.gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.gallery figure {
  margin: 0;
  min-width: 0;
}
.gallery a {
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
}
.gallery img {
  aspect-ratio: 16/10;
  width: 100%;
  object-fit: cover;
  object-position: center 65%;
  transition: transform 0.25s;
}
.gallery a:hover img {
  transform: scale(1.03);
}
.gallery figcaption {
  display: flex;
  gap: 20px;
  justify-content: space-between;
  align-items: baseline;
  margin-top: 12px;
  font-size: 0.88rem;
}
.gallery figcaption span {
  color: var(--muted);
  font-size: 0.72rem;
}
.gallery-note {
  max-width: 820px;
  margin: 1.6rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}
.comfort {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}
.comfort-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: item;
}
.comfort-list li {
  padding: 1.2rem 0 1.2rem 2.8rem;
  border-bottom: 1px solid var(--line);
  position: relative;
}
.comfort-list li:last-child {
  border-bottom: 0;
}
.comfort-list li::before {
  counter-increment: item;
  content: "0" counter(item);
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.75rem;
  top: 1.4rem;
}
.comfort-list strong {
  display: block;
  font-weight: 600;
}
.comfort-list p {
  font-size: 0.89rem;
  color: var(--muted);
  margin: 0.35rem 0 0;
}
.comfort-copy p:not(.eyebrow) {
  margin-top: 1.3rem;
  color: var(--muted);
}
.download-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
}
.download-copy > p:not(.eyebrow) {
  color: var(--muted);
  max-width: 32rem;
  margin-top: 1.5rem;
}
.fine {
  font-size: 0.77rem;
  color: var(--muted);
  line-height: 1.75;
}
.download-card {
  padding: 32px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.download-card > label,
.download-card legend {
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.05em;
  margin-bottom: 9px;
}
.download-card select {
  background: var(--raised);
  border: 1px solid var(--line);
  color: var(--ink);
  border-radius: 5px;
  padding: 12px;
  width: 100%;
  margin-bottom: 22px;
}
.download-card fieldset {
  padding: 0;
  margin: 0;
  border: 0;
}
.editions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.editions label {
  border: 1px solid var(--line);
  border-radius: 7px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  background: var(--raised);
  cursor: pointer;
}
.editions label:has(input:checked) {
  border-color: var(--accent);
}
input[type="radio"] {
  accent-color: var(--accent);
}
.edition-help {
  font-size: 0.82rem;
  color: var(--muted);
  min-height: 4rem;
  margin: 15px 0;
}
.download-card .button {
  width: 100%;
}
.download-meta {
  font-size: 0.72rem;
  color: var(--muted);
  margin: 13px 0 0;
  overflow-wrap: anywhere;
}
.release-link {
  display: block;
  margin-top: 16px;
  font-size: 0.77rem;
}
.faq-list {
  max-width: 850px;
}
.faq-list details {
  border-bottom: 1px solid var(--line);
}
.faq-list summary {
  padding: 22px 0;
  cursor: pointer;
  font-weight: 500;
  list-style: none;
  position: relative;
  padding-right: 30px;
}
.faq-list summary::-webkit-details-marker {
  display: none;
}
.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 0;
  color: var(--accent);
}
.faq-list details[open] summary::after {
  content: "−";
}
.faq-list details p {
  color: var(--muted);
  font-size: 0.94rem;
  max-width: 750px;
  margin-bottom: 23px;
}
.family {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin: 2rem 0 0;
}
.family a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-decoration: none;
  border-top: 1px solid var(--line);
  padding: 22px 0;
}
.family strong {
  display: block;
  font-size: 1.15rem;
  font-weight: 550;
}
.family small {
  color: var(--muted);
  font-size: 0.8rem;
}
.family .arrow {
  color: var(--accent);
  font-size: 1.4rem;
}
.site-footer {
  padding: 45px 0 28px;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
}
.footer-top p {
  max-width: 690px;
  color: var(--muted);
  font-size: 0.8rem;
}
.footer-links {
  display: flex;
  align-items: start;
  gap: 22px;
  font-size: 0.8rem;
  flex-wrap: wrap;
}
.copyright {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 25px;
  color: var(--muted);
  font-size: 0.7rem;
}
.guide-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 80px;
  padding: 60px 0 90px;
}
.guide-nav {
  position: sticky;
  top: 115px;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 0.83rem;
}
.guide-nav a {
  color: var(--muted);
  text-decoration: none;
}
.guide-nav a:hover {
  color: var(--accent);
}
.guide-content {
  max-width: 820px;
  min-width: 0;
}
.guide-content h1 {
  font-size: 3.3rem;
  margin-bottom: 20px;
}
.guide-content > p {
  color: var(--muted);
}
.guide-content section {
  padding-top: 52px;
}
.guide-content h2 {
  font-size: 1.85rem;
  margin-bottom: 20px;
}
.guide-content h3 {
  margin: 24px 0 14px;
}
.guide-content li,
.guide-content section p {
  color: var(--muted);
}
.guide-content strong {
  color: var(--ink);
}
.guide-content table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.87rem;
}
.guide-content td,
.guide-content th {
  border-bottom: 1px solid var(--line);
  padding: 14px 12px 14px 0;
  text-align: left;
  vertical-align: top;
}
.guide-content th {
  color: var(--ink);
}
.guide-content td {
  color: var(--muted);
}
.note {
  border-left: 2px solid var(--accent);
  background: var(--surface);
  padding: 18px 22px;
  margin: 24px 0;
  color: var(--muted);
  font-size: 0.88rem;
}
.lightbox {
  width: min(1600px, 96vw);
  max-width: none;
  padding: 12px;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 8px;
  max-height: 95vh;
}
.lightbox::backdrop {
  background: #000d;
  backdrop-filter: blur(5px);
}
.lightbox img {
  max-height: 82vh;
  width: auto;
  margin: auto;
  object-fit: contain;
}
.lightbox-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 25px;
  padding: 12px 4px 0;
  font-size: 0.8rem;
}
.lightbox button {
  background: var(--raised);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 7px 14px;
}
.lightbox p {
  margin: 0;
}
.lightbox:not([open]) {
  display: none;
}
@media (max-width: 1000px) {
  .hero {
    grid-template-columns: 1fr;
    padding-top: 60px;
    gap: 40px;
  }
  .hero-copy {
    max-width: 800px;
  }
  .hero-media img {
    aspect-ratio: 16/9;
  }
  .hero-copy > p:not(.eyebrow) {
    max-width: 600px;
  }
  .hero-media {
    max-width: 900px;
  }
  .comfort,
  .download-section {
    gap: 3rem;
  }
  .guide-layout {
    gap: 40px;
    grid-template-columns: 170px 1fr;
  }
  .nav {
    gap: 1rem;
  }
  .header-inner {
    gap: 1rem;
  }
}
@media (max-width: 700px) {
  .wrap {
    width: calc(100% - 36px);
  }
  .header-inner {
    min-height: 72px;
    flex-wrap: wrap;
    gap: 10px;
    padding-block: 13px;
  }
  .brand {
    font-size: 1.15rem;
  }
  .brand img {
    width: 32px;
    height: 32px;
  }
  .nav {
    gap: 14px;
  }
  .nav .optional {
    display: none;
  }
  .nav .locale {
    padding-left: 14px;
  }
  .nav a {
    font-size: 0.77rem;
  }
  .theme {
    width: 30px;
    height: 30px;
  }
  .hero {
    padding-top: 45px;
    padding-bottom: 38px;
  }
  .hero h1 {
    font-size: 3.1rem;
  }
  .hero-copy > p:not(.eyebrow) {
    font-size: 1rem;
  }
  .capabilities {
    gap: 10px 20px;
    font-size: 0.7rem;
  }
  .section {
    padding: 55px 0;
  }
  .section-head {
    display: block;
  }
  .section-head > p {
    margin-top: 20px;
  }
  .feature-list {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .feature-list article {
    padding: 0;
  }
  .number {
    float: left;
    margin: 0 18px 40px 0;
    font-size: 1.45rem;
  }
  .gallery {
    grid-template-columns: 1fr;
  }
  .comfort,
  .download-section {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .download-card {
    padding: 23px;
  }
  .family {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .footer-top,
  .copyright {
    display: block;
  }
  .copyright span {
    display: block;
    margin-top: 8px;
  }
  .footer-links {
    margin-top: 23px;
  }
  .guide-layout {
    grid-template-columns: 1fr;
    padding-top: 30px;
    gap: 35px;
  }
  .guide-nav {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 10px 20px;
    border-bottom: 1px solid var(--line);
    padding-bottom: 20px;
  }
  .guide-content h1 {
    font-size: 2.7rem;
  }
  .guide-content table {
    font-size: 0.77rem;
  }
  .lightbox-footer {
    gap: 10px;
  }
  .lightbox-footer p {
    font-size: 0.7rem;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}