:root {
  --white: #ffffff;
  --mist: #f4f9ff;
  --sky: #e5f1ff;
  --blue: #3182f6;
  --blue-hover: #1769d2;
  --action: #1466c2;
  --action-hover: #0f55a8;
  --blue-soft: #86baff;
  --ink: #254566;
  --body: #38516b;
  --muted: #4e6983;
  --line: #d7e6f5;
  --yellow: #ffcd65;
  --shell: min(100% - 2.5rem, 74rem);
  --hero-copy-width: 36rem;
  --radius: 1rem;
  --elevation: 0 1.1rem 2.8rem rgb(49 130 246 / 10%);
  --display: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --sans: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--body); background: var(--white); font-family: var(--sans); font-size: 1rem; line-height: 1.7; }
img { display: block; max-width: 100%; }
a { color: inherit; }
button, summary { font: inherit; }
::selection { background: var(--sky); color: var(--ink); }
:focus-visible { outline: .2rem solid var(--blue); outline-offset: .25rem; }

.shell { width: var(--shell); margin-inline: auto; }
.skip-link { position: fixed; z-index: 100; left: 1rem; top: -5rem; padding: .65rem 1rem; background: var(--action); color: var(--white); border-radius: .5rem; text-decoration: none; }
.skip-link:focus { top: 1rem; }

.site-header { position: sticky; z-index: 20; top: 0; background: rgb(255 255 255 / 92%); border-bottom: 1px solid rgb(215 230 245 / 80%); backdrop-filter: blur(14px); }
.header-inner { min-height: 5rem; display: flex; align-items: center; gap: 1.5rem; }
.brand { display: inline-flex; flex: 0 0 auto; align-items: center; gap: .65rem; text-decoration: none; color: var(--ink); }
.brand img { width: 2.6rem; height: 2.6rem; border-radius: .75rem; object-fit: cover; }
.brand-copy { display: grid; line-height: 1.15; }
.brand strong { font-size: 1.05rem; letter-spacing: .01em; }
.brand small { color: var(--muted); font-size: .68rem; letter-spacing: .05em; }
.site-nav { display: flex; align-items: center; justify-content: center; gap: clamp(.85rem, 2vw, 1.6rem); margin-left: auto; }
.site-nav a, .site-footer nav a { color: var(--body); font-size: .875rem; text-decoration: none; text-underline-offset: .35em; }
.site-nav a:hover, .site-footer nav a:hover, .text-link:hover { color: var(--blue-hover); text-decoration: underline; }

.button { display: inline-flex; min-height: 3.15rem; align-items: center; justify-content: center; padding: .7rem 1.25rem; border: 1px solid var(--action); border-radius: 99px; background: var(--action); color: var(--white); font-size: .95rem; font-weight: 700; line-height: 1.2; text-decoration: none; box-shadow: 0 .6rem 1.3rem rgb(20 102 194 / 20%); transition: background .2s ease, border-color .2s ease, transform .2s ease, box-shadow .2s ease; }
.button:hover { background: var(--action-hover); border-color: var(--action-hover); box-shadow: 0 .9rem 1.7rem rgb(20 102 194 / 28%); transform: translateY(-2px); }
.button-small { min-width: 6.5rem; min-height: 2.35rem; padding: .45rem 1.25rem; margin-left: .15rem; border-color: #1689f6; background: var(--white); color: #1689f6; box-shadow: none; font-size: .875rem; }
.button-small:hover { border-color: #1689f6; background: #1689f6; color: var(--white); box-shadow: 0 .6rem 1.3rem rgb(22 137 246 / 22%); }
.button-light { min-height: 2.7rem; background: var(--white); color: #1689f6; border-color: #b9dafe; box-shadow: none; font-size: .875rem; }
.button-light:hover { background: #f4faff; border-color: #77b8f8; color: #1076dc; }
.text-link { display: inline-flex; align-items: center; gap: .35rem; color: var(--blue-hover); font-size: .95rem; font-weight: 700; text-decoration: none; text-underline-offset: .3em; }
.text-link span { font-size: 1.2em; transition: transform .2s ease; }
.text-link:hover span { transform: translateX(.2rem); }

.hero { position: relative; isolation: isolate; overflow: clip; padding: clamp(4.8rem, 9vw, 8rem) 0 clamp(5rem, 10vw, 9rem); background: linear-gradient(135deg, var(--white) 0%, var(--mist) 54%, var(--sky) 100%); }
.hero::before, .hero::after { position: absolute; z-index: 0; border: 1px solid rgb(134 186 255 / 58%); border-radius: 50%; content: ""; pointer-events: none; }
.hero::before { top: -15rem; right: -23rem; width: 43rem; height: 43rem; }
.hero::after { right: -11rem; bottom: -27rem; width: 37rem; height: 37rem; }
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(25rem, .9fr); align-items: center; gap: clamp(2rem, 5vw, 5rem); }
.hero-copy { width: min(100%, var(--hero-copy-width)); justify-self: start; order: 1; text-align: left; transform: translateY(-1.25rem); }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { color: var(--ink); text-wrap: balance; }
h1 { max-width: 12ch; margin-bottom: .8rem; font-family: var(--display); color: var(--ink); font-size: clamp(3.4rem, 4.8vw, 5.1rem); font-weight: 800; line-height: 1.05; letter-spacing: -.04em; }
.hero-copy h1 { margin-inline: 0; }
.hero-tagline { max-width: 18ch; margin-bottom: 1.15rem; color: #1689f6; font-family: var(--display); font-size: clamp(1.65rem, 2.35vw, 2.55rem); font-weight: 800; line-height: 1.2; letter-spacing: -.025em; }
.hero-copy .hero-tagline { margin-inline: 0; }
.hero-lead { max-width: var(--hero-copy-width); margin-bottom: 1.8rem; color: var(--body); font-size: clamp(1rem, 1.35vw, 1.12rem); text-wrap: pretty; }
.hero-actions { display: flex; align-items: center; justify-content: flex-start; flex-wrap: wrap; gap: 1.15rem; }
.hero-actions .button { min-width: 10.5rem; }
.hero-actions .button { border-color: #16b6f0; background: linear-gradient(135deg, #16c7ee 0%, #1797f2 100%); box-shadow: 0 1rem 2rem rgb(20 169 238 / 26%); }
.hero-actions .button:hover { border-color: #11b9f0; background: linear-gradient(135deg, #10bfe9 0%, #117fe5 100%); box-shadow: 0 1.2rem 2.5rem rgb(20 169 238 / 34%); }
.hero-points { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; max-width: var(--hero-copy-width); margin: 3rem 0 0; padding: 1.25rem 0 0; border-top: 1px solid var(--line); text-align: left; }
.hero-points div + div { padding-left: 1rem; }
.hero-points dt { margin-bottom: .18rem; color: var(--blue-hover); font-size: .92rem; font-weight: 800; }
.hero-points dd { margin: 0; color: var(--muted); font-size: .78rem; line-height: 1.55; }

.hero-visual { position: relative; order: 1; width: min(100%, 28rem); justify-self: start; margin: 0; padding: 1.5rem 2rem 1.9rem; }
.phone-frame { position: relative; width: min(82%, 23rem); margin-inline: auto; padding: .65rem; background: var(--white); border: .4rem solid var(--white); border-radius: 2.35rem; box-shadow: 0 1.4rem 3rem rgb(42 118 205 / 20%); transform: rotate(3deg); }
.phone-speaker { position: absolute; z-index: 1; top: .65rem; left: 50%; width: 4rem; height: .35rem; border-radius: 99px; background: rgb(37 69 102 / 20%); transform: translateX(-50%); }
.phone-screen { position: relative; overflow: hidden; aspect-ratio: 2 / 3; border-radius: 1.6rem; background: var(--sky); }
.phone-screen img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.demo-badge { position: absolute; right: .8rem; bottom: .75rem; padding: .2rem .55rem; border-radius: 99px; background: rgb(255 255 255 / 82%); color: var(--body); font-size: .72rem; font-weight: 700; backdrop-filter: blur(4px); }
.star { position: absolute; z-index: 3; color: var(--yellow); font-size: 1.7rem; line-height: 1; }
.star-one { top: 12%; left: 0; animation: float 4s ease-in-out infinite; }
.star-two { right: 0; bottom: 21%; font-size: 1.25rem; animation: float 4s ease-in-out 1s infinite; }
.story-line { position: absolute; top: 32%; right: -7%; width: 42%; height: 2px; background: var(--blue-soft); transform: rotate(40deg); opacity: .65; }
.story-chip { position: absolute; z-index: 4; padding: .55rem .8rem; border: 1px solid var(--line); border-radius: .75rem; background: var(--white); color: var(--blue-hover); box-shadow: 0 .75rem 1.8rem rgb(49 130 246 / 13%); font-size: .72rem; font-weight: 800; line-height: 1.3; }
.story-chip::after { position: absolute; width: .65rem; height: .65rem; background: var(--white); content: ""; transform: rotate(45deg); }
.story-chip-top { top: 18%; left: -8%; transform: rotate(-7deg); }
.story-chip-top::after { right: 1rem; bottom: -.38rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.story-chip-bottom { right: -7%; bottom: 15%; transform: rotate(5deg); }
.story-chip-bottom::after { left: 1rem; bottom: -.38rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.hero-visual figcaption { max-width: 27rem; margin: 1.3rem auto 0; color: var(--muted); font-size: .72rem; line-height: 1.5; text-align: center; }

.feature-section, .versions-section, .faq-section { padding: clamp(5rem, 10vw, 8.5rem) .75rem; }
.feature-section { background: radial-gradient(circle at 50% 2%, #f2f9ff 0, var(--white) 29rem); }
.section-heading { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(17rem, .72fr); gap: clamp(2rem, 7vw, 6rem); align-items: end; margin-bottom: clamp(2.5rem, 5vw, 4.5rem); }
.section-heading h2 { max-width: 15ch; margin-bottom: 0; font-family: var(--display); font-size: clamp(2.35rem, 4.5vw, 4.25rem); font-weight: 800; line-height: 1.12; letter-spacing: -.03em; }
.section-heading p { max-width: 34rem; margin-bottom: .35rem; color: var(--body); font-size: 1.02rem; }
.feature-heading { display: block; margin-bottom: clamp(2.25rem, 5vw, 3.6rem); text-align: center; }
.feature-heading h2 { max-width: none; font-size: clamp(2.35rem, 4.2vw, 3.8rem); }
.feature-heading h2 span { color: #1689f6; }
.feature-heading p { max-width: none; margin: .7rem 0 0; color: #6680a4; font-size: clamp(1rem, 1.5vw, 1.25rem); }
.feature-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.8rem; }
.feature-card { --tilt: 0deg; position: relative; display: flex; min-height: 20.8rem; flex-direction: column; align-items: center; justify-content: center; overflow: hidden; padding: 2.2rem 1.5rem 1.75rem; border: 1px solid #d9ebff; border-radius: 1.5rem; background: rgb(255 255 255 / 88%); color: #071a3a; text-align: center; box-shadow: 0 .5rem 1.5rem rgb(49 130 246 / 4%); transform: rotate(var(--tilt)); transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease; }
.feature-card:nth-child(1), .feature-card:nth-child(5) { --tilt: -1.15deg; }
.feature-card:nth-child(2), .feature-card:nth-child(6) { --tilt: .75deg; }
.feature-card:nth-child(3) { --tilt: -.45deg; }
.feature-card:nth-child(4) { --tilt: .5deg; }
.feature-card:hover { border-color: #90c8ff; box-shadow: 0 1rem 2.3rem rgb(49 130 246 / 12%); transform: translateY(-.2rem) rotate(var(--tilt)); }
.feature-card.feature-card-highlight { border-color: #16b6f0; background: linear-gradient(135deg, #16c7ee 0%, #1797f2 100%); color: var(--white); box-shadow: 0 1rem 2rem rgb(20 169 238 / 26%); }
.feature-card.feature-card-highlight:hover { border-color: #16b6f0; background: linear-gradient(135deg, #16c7ee 0%, #1797f2 100%); box-shadow: 0 1rem 2rem rgb(20 169 238 / 26%); transform: rotate(var(--tilt)); }
.feature-number { position: absolute; z-index: 1; top: 1.55rem; left: 1.6rem; padding: .16rem .72rem; border-radius: .75rem; background: #eef6ff; color: #1677ed; font-size: .78rem; font-weight: 500; line-height: 1.6; }
.feature-card-highlight .feature-number { background: rgb(255 255 255 / 20%); color: var(--white); }
.feature-icon { position: relative; z-index: 1; display: grid; width: 7.35rem; height: 7.35rem; place-items: center; margin-bottom: 1rem; border-radius: 50%; background: #edf7ff; color: #071a3a; }
.feature-card-highlight .feature-icon { background: rgb(255 255 255 / 12%); color: var(--white); }
.feature-icon svg { width: 4.3rem; height: 4.3rem; }
.feature-card h3 { position: relative; z-index: 1; margin: 0 0 .45rem; color: inherit; font-family: var(--display); font-size: clamp(1.35rem, 1.75vw, 1.6rem); font-weight: 400; line-height: 1.35; }
.feature-card p { position: relative; z-index: 1; margin: 0; color: #60799f; font-size: .86rem; font-weight: 400; line-height: 1.65; }
.feature-card-highlight p { color: var(--white); }

.overview-section { overflow: hidden; padding: clamp(5rem, 9vw, 7.5rem) .75rem; background: #f6fbff; }
.overview-heading { display: block; margin-bottom: clamp(2.5rem, 5vw, 4rem); text-align: center; }
.overview-heading h2 { max-width: none; }
.overview-heading p { max-width: none; margin: .7rem 0 0; color: var(--muted); }
.overview-gallery { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: clamp(.8rem, 1.6vw, 1.3rem); align-items: center; }
.overview-device { aspect-ratio: 11 / 19; margin: 0; overflow: hidden; padding: .55rem; border: 1px solid #cfe4fb; border-radius: 1.45rem; background: var(--white); box-shadow: 0 1rem 2.4rem rgb(49 130 246 / 12%); transition: box-shadow .2s ease, transform .2s ease; }
.overview-device img { width: 100%; height: 100%; border-radius: 1rem; object-fit: cover; object-position: top; }
.overview-device-one { transform: rotate(-1.5deg); }
.overview-device-two { transform: translateY(.9rem) rotate(.7deg); }
.overview-device-three { transform: translateY(-.7rem) rotate(-.45deg); }
.overview-device-four { transform: translateY(.9rem) rotate(.8deg); }
.overview-device-five { transform: rotate(-1.2deg); }
.overview-device:hover { box-shadow: 0 1.45rem 2.8rem rgb(49 130 246 / 20%); transform: translateY(-.35rem) rotate(0deg); }

.versions-section { --download-block-gap: clamp(3.75rem, 7vw, 5.75rem); --steps-block-gap: clamp(2rem, 4vw, 3rem); padding-block: var(--download-block-gap) var(--steps-block-gap); background: var(--mist); }
.versions-heading { margin-bottom: clamp(1.5rem, 2.5vw, 2rem); }
.version-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(1.25rem, 2.5vw, 2rem); padding: clamp(1.5rem, 3.5vw, 2.5rem); border: 1px solid #cfe3f8; border-radius: 1.5rem; background: var(--white); box-shadow: var(--elevation); }
.version-item { display: grid; grid-template-columns: 1fr; justify-items: center; gap: .9rem; padding: 1.25rem 1.5rem; background: transparent; text-align: center; }
.version-item:not(:last-child) { border-right: 1px solid var(--line); }
.platform-icon { display: grid; width: 3.5rem; height: 3.5rem; place-items: center; border-radius: .9rem; background: var(--sky); color: var(--blue-hover); }
.platform-icon svg { width: 2rem; height: 2rem; }
.version-main h3 { margin-bottom: .1rem; font-size: 1.1rem; }
.version-main p { margin: 0; color: var(--muted); font-size: .82rem; }
.version-meta { display: flex; justify-content: center; gap: clamp(1rem, 4vw, 2rem); margin: .15rem 0 0; }
.version-meta div { display: grid; gap: .1rem; }
.version-meta dt { color: var(--muted); font-size: .72rem; }
.version-meta dd { margin: 0; color: var(--body); font-size: .86rem; font-variant-numeric: tabular-nums; }
.version-item .button { width: 100%; margin-top: .25rem; }
.release-note { display: flex; align-items: flex-start; gap: .5rem; margin: 1.5rem 0 0; color: var(--muted); font-size: .84rem; }
.release-note span { color: var(--yellow); }

.guide-layout { display: block; }
.guide-inline { margin-top: var(--download-block-gap); }
.guide-label { display: flex; align-items: center; justify-content: center; gap: .9rem; width: 100%; margin: 0 auto var(--steps-block-gap); padding: 0; border: 0; border-radius: 0; background: transparent; color: var(--muted); font-size: .88rem; font-weight: 700; line-height: 1.5; text-align: center; }
.guide-label::before, .guide-label::after { height: 1px; flex: 1; background: rgb(78 105 131 / 14%); content: ""; }
.steps-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 1.25rem; margin: 0; padding: 0; list-style: none; }
.steps-list li { display: grid; grid-template-columns: 2.5rem 1fr; align-content: start; gap: 1rem; min-height: 0; padding: .25rem 1rem; }
.steps-list span { display: grid; width: 2.2rem; height: 2.2rem; place-items: center; border-radius: 50%; background: var(--white); color: var(--blue-hover); font-size: .85rem; font-weight: 800; box-shadow: 0 .5rem 1.2rem rgb(49 130 246 / 10%); }
.steps-list h3 { margin-bottom: .25rem; font-size: 1.08rem; }
.steps-list p { margin: 0; font-size: .9rem; }

.faq-section { background: var(--white); }
.faq-layout { display: block; }
.faq-heading { display: block; margin: 0 0 clamp(2.25rem, 5vw, 3.6rem); text-align: center; }
.faq-heading h2 { max-width: none; }
.faq-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: clamp(2rem, 5vw, 5rem); }
.faq-list details { border-top: 1px solid var(--line); }
.faq-list details:nth-last-child(-n + 2) { border-bottom: 1px solid var(--line); }
.faq-list summary { position: relative; padding: 1.2rem 2.1rem 1.2rem 0; color: var(--ink); cursor: pointer; font-weight: 700; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { position: absolute; right: .2rem; color: var(--blue); content: "+"; font-size: 1.4rem; font-weight: 400; line-height: 1.25; transition: transform .2s ease; }
.faq-list details[open] summary::after { transform: rotate(45deg); }
.faq-list p { max-width: 58ch; margin: -.1rem 0 1.2rem; color: var(--body); font-size: .9rem; }

.site-footer { padding: 2.4rem 0; background: var(--mist); border-top: 1px solid var(--line); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 1.2rem; }
.footer-brand img { width: 2.2rem; height: 2.2rem; border-radius: .65rem; }
.footer-brand span { color: var(--ink); font-size: .9rem; font-weight: 800; }
.footer-inner p { margin: 0; color: var(--muted); font-size: .78rem; }
.site-footer nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 1rem; }
.site-footer nav a { font-size: .78rem; }

@keyframes float { 50% { transform: translateY(-.5rem) rotate(8deg); } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}
@media (max-width: 56rem) {
  .hero::before, .hero::after { display: none; }
  .site-nav { display: none; }
  .header-inner { justify-content: space-between; }
  .header-inner .button-small { margin-left: auto; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-copy { justify-self: start; order: 1; max-width: 42rem; transform: none; }
  .hero-visual { order: 2; width: min(100%, 26rem); justify-self: center; margin-top: .5rem; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
  .overview-gallery { grid-auto-columns: minmax(11rem, 54vw); grid-auto-flow: column; grid-template-columns: none; overflow-x: auto; padding: .6rem .5rem 1.2rem; scroll-snap-type: x mandatory; }
  .overview-device { scroll-snap-align: center; }
  .section-heading { grid-template-columns: 1fr; gap: 1rem; }
  .version-list { grid-template-columns: 1fr; padding: 1.1rem; }
  .version-item { grid-template-columns: 1fr; justify-items: center; }
  .version-item:not(:last-child) { border-right: 0; border-bottom: 1px solid var(--line); }
  .version-meta { grid-column: auto; }
  .version-item .button { grid-column: auto; grid-row: auto; }
  .steps-list, .faq-list { grid-template-columns: 1fr; }
  .steps-list li { min-height: auto; }
  .faq-list details:nth-last-child(-n + 2) { border-bottom: 0; }
  .faq-list details:last-child { border-bottom: 1px solid var(--line); }
}
@media (max-width: 38rem) {
  :root { --shell: min(100% - 1.5rem, 74rem); }
  .header-inner { min-height: 3.8rem; gap: .7rem; }
  .brand-copy small { display: none; }
  .brand strong { font-size: .94rem; }
  .brand img { width: 2.25rem; height: 2.25rem; }
  .button-small { min-width: 5.75rem; min-height: 2.125rem; padding-inline: 1rem; font-size: .78rem; }
  .hero { padding-top: 3.6rem; padding-bottom: 2rem; }
  .hero-copy { justify-self: center; text-align: center; }
  .hero-copy h1, .hero-copy .hero-tagline { margin-inline: auto; }
  .hero-tagline { margin-bottom: .85rem; }
  .hero-lead { margin-bottom: 1.15rem; }
  .hero-actions { width: 100%; align-items: stretch; justify-content: flex-start; flex-direction: column; gap: .65rem; }
  .hero-actions > * { flex: none; width: 100%; justify-content: center; }
  .hero-actions .text-link { min-height: 2.25rem; }
  .hero-points { margin-top: 1.5rem; text-align: center; }
  h1 { font-size: clamp(2.75rem, 14vw, 4.2rem); }
  .hero-points { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .6rem; padding-top: 1rem; }
  .hero-points div + div { padding-left: 0; border-left: 0; }
  .hero-points dd { font-size: .72rem; line-height: 1.5; }
  .hero-visual { width: min(100%, 17rem); padding: 1rem 1.25rem 1.45rem; }
  .story-chip { font-size: .72rem; }
  .story-chip-top { left: -3%; }
  .story-chip-bottom { right: -3%; }
  .feature-grid { grid-template-columns: 1fr; gap: 1.35rem; }
  .feature-card { min-height: 18.5rem; }
  .section-heading h2 { font-size: clamp(2.25rem, 11vw, 3rem); }
  .version-item { grid-template-columns: 1fr; gap: .8rem; padding: 1.2rem 1rem; }
  .platform-icon { width: 3rem; height: 3rem; }
  .version-main h3 { font-size: 1rem; }
  .version-meta { grid-column: auto; gap: 1.8rem; padding-top: .4rem; }
  .version-item .button { grid-column: auto; grid-row: auto; width: 100%; }
  .footer-inner { align-items: flex-start; flex-direction: column; }
  .site-footer nav { justify-content: flex-start; }
}