:root{--ink:#272123;--muted:#655e5e;--accent:#20a8f0;--accent-dark:#075b91;--accent-soft:#e6f5fe;--paper:#f8fafc;--surface:#fff;--surface-warm:#faeee7;--line:#e0e8ef;--shadow:0 18px 44px rgba(42,83,110,.08)}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:96px}
body{margin:0;color:var(--ink);background:var(--paper);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.65}
a{color:inherit;text-decoration:none}
a:focus-visible,summary:focus-visible{outline:3px solid var(--accent-dark);outline-offset:4px}
ul{margin:0;padding:0;list-style:none}
h1,h2,h3,p{margin-top:0}
p{color:var(--muted)}
svg{display:block}
.container{width:min(100% - 48px,1180px);margin-inline:auto}

.site-header{position:sticky;top:0;z-index:50;background:rgba(248,250,252,.82);border-bottom:1px solid transparent;-webkit-backdrop-filter:blur(18px) saturate(1.2);backdrop-filter:blur(18px) saturate(1.2)}
.site-header.is-scrolled{border-bottom-color:var(--line)}
.header-inner{min-height:82px;display:flex;align-items:center;gap:28px}
.brand{display:inline-flex;flex:none;align-items:center;min-height:44px;gap:10px;color:var(--accent-dark);font-weight:800;font-size:21px;letter-spacing:-.04em;white-space:nowrap}
.brand-image{display:block;width:48px;height:48px;object-fit:contain}
.site-nav{display:flex;align-items:center;justify-content:center;gap:clamp(17px,2.3vw,34px);margin-inline:auto}
.site-nav a{position:relative;display:inline-flex;align-items:center;min-height:44px;font-size:15px;font-weight:650;white-space:nowrap;transition:color .2s ease}
.site-nav a:hover,.site-nav a:focus-visible{color:var(--accent-dark)}
.site-nav a::after{content:"";position:absolute;right:0;bottom:4px;left:0;height:2px;background:var(--accent-dark);border-radius:2px;transform:scaleX(0);transform-origin:center;transition:transform .2s ease}
.site-nav a:hover::after,.site-nav a:focus-visible::after{transform:scaleX(1)}
body:not(:has(main :target)) .site-nav a[href="#home"],body:has(#home:target) .site-nav a[href="#home"],body:has(#library:target) .site-nav a[href="#library"],body:has(#tools:target) .site-nav a[href="#tools"],body:has(#screens:target) .site-nav a[href="#screens"],body:has(#faq:target) .site-nav a[href="#faq"]{color:var(--accent-dark)}
body:not(:has(main :target)) .site-nav a[href="#home"]::after,body:has(#home:target) .site-nav a[href="#home"]::after,body:has(#library:target) .site-nav a[href="#library"]::after,body:has(#tools:target) .site-nav a[href="#tools"]::after,body:has(#screens:target) .site-nav a[href="#screens"]::after,body:has(#faq:target) .site-nav a[href="#faq"]::after{transform:scaleX(1)}
.header-download{flex:none}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:54px;padding:12px 27px;border:1.5px solid transparent;border-radius:999px;font-size:15px;font-weight:750;line-height:1.3;text-align:center;white-space:nowrap;transition:background .2s ease,border-color .2s ease,color .2s ease,transform .2s ease,box-shadow .2s ease}
.button:hover{transform:translateY(-2px)}
.button:active{transform:translateY(0)}
.button-primary{color:#fff;background:var(--accent);box-shadow:0 8px 18px rgba(32,168,240,.2)}
.button-primary:hover{box-shadow:0 10px 24px rgba(32,168,240,.24)}
.button-secondary{color:var(--accent-dark);border-color:var(--accent-dark);background:transparent}
.button-secondary:hover{border-color:var(--accent-dark);background:transparent}
.button-with-icon{gap:8px}
.button-icon{display:block;width:20px;height:20px;flex:none}
.button-small{min-height:46px;padding:10px 20px;font-size:14px}
.button-small .button-icon{width:17px;height:17px}
.button-row{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}
.button-row .button-primary{min-width:250px}
.button-row .button-secondary{min-width:176px}

.section{padding-block:104px}
.hero{overflow:hidden;padding-block:88px 0;background:linear-gradient(135deg,var(--paper) 0%,var(--surface-warm) 55%,#f3f9fd 100%)}
.hero-copy{max-width:1120px;margin-inline:auto;text-align:center}
.hero h1{max-width:1120px;margin:0 auto 17px;font-size:clamp(39px,4.3vw,62px);font-weight:850;line-height:1.22;letter-spacing:-.055em;text-wrap:balance}
.hero-title-sub{display:block}
.hero-description{max-width:700px;margin:0 auto 24px;font-size:17px;line-height:1.75}
.hero-stage{--fade-start:250px;--fade-end:470px;position:relative;height:470px;margin-top:34px;overflow:hidden}
.hero-media{position:absolute;top:0;left:50%;z-index:1;width:560px;transform:translateX(-50%)}
.hero-phone-image{display:block;width:100%;height:auto;filter:drop-shadow(0 24px 28px rgba(34,29,28,.1));-webkit-mask-image:linear-gradient(to bottom,#000 0,#000 var(--fade-start),rgba(0,0,0,.88) calc(var(--fade-start) + 35px),rgba(0,0,0,.45) calc(var(--fade-end) - 75px),rgba(0,0,0,.12) calc(var(--fade-end) - 25px),transparent var(--fade-end));mask-image:linear-gradient(to bottom,#000 0,#000 var(--fade-start),rgba(0,0,0,.88) calc(var(--fade-start) + 35px),rgba(0,0,0,.45) calc(var(--fade-end) - 75px),rgba(0,0,0,.12) calc(var(--fade-end) - 25px),transparent var(--fade-end))}
.hero-feature{position:absolute;z-index:2;display:flex;align-items:center;gap:11px;min-height:62px;padding:10px 16px;border:1px solid var(--line);border-radius:17px;background:var(--surface);box-shadow:0 14px 30px rgba(42,83,110,.1);white-space:nowrap}
.hero-feature-left{top:16%;left:-100px}
.hero-feature-right{top:27%;right:-70px}
.hero-feature strong{display:block;font-size:15px;letter-spacing:-.02em}
.feature-icon{display:grid;width:28px;height:28px;flex:none;align-self:center;place-content:center;place-items:center;color:var(--accent);line-height:0}
.hero-feature-right .feature-icon{color:#a96048}
.feature-icon-grid{grid-template-columns:repeat(2,7px);grid-template-rows:repeat(2,7px);gap:3px}
.feature-icon-grid i{display:block;width:7px;height:7px;border:1.5px solid currentColor;border-radius:2px}
.feature-icon-tools svg{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}

.section-heading{max-width:700px;margin:0 auto 42px;text-align:center}
.section-heading h2{margin-bottom:12px;font-size:clamp(34px,3.6vw,48px);line-height:1.2;letter-spacing:-.045em}
.section-heading p{margin-bottom:0;font-size:16px;line-height:1.8}
#library{background:var(--surface)}
.library-showcase{max-width:980px;margin-inline:auto}
.library-browser{overflow:hidden;padding:28px;border:1px solid var(--line);border-radius:32px;background:var(--paper);box-shadow:var(--shadow)}
.library-browser-top{display:flex;align-items:center;gap:18px;margin-bottom:23px;font-size:19px}
.browser-dots{display:flex;gap:6px}
.browser-dots i{display:block;width:8px;height:8px;border-radius:50%;background:#cbdfe9}
.browser-dots i:first-child{background:var(--accent)}
.browser-dots i:nth-child(2){background:#8cccec}
.library-search{display:flex;align-items:center;gap:12px;height:52px;margin-bottom:22px;padding:0 18px;border:1px solid var(--line);border-radius:15px;color:#7b6e69;background:var(--surface);font-size:14px}
.library-search svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}
.category-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.category-card{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:162px;padding:21px 12px;border:1px solid var(--line);border-radius:22px;background:var(--surface);text-align:center;transition:transform .2s ease,box-shadow .2s ease}
.category-card:hover,.tool-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.category-symbol{display:grid;width:61px;height:61px;margin-bottom:14px;place-items:center;border-radius:19px;color:var(--accent);background:var(--accent-soft)}
.category-card:nth-child(2) .category-symbol{color:#a96048;background:var(--surface-warm)}
.category-symbol svg{width:32px;height:32px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.category-card h3{margin:0;font-size:19px;line-height:1.3}
.tool-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.tool-card p{margin-bottom:0;font-size:15px;line-height:1.7}

#tools{background:linear-gradient(135deg,var(--paper),var(--surface-warm))}
.tool-card{min-height:228px;padding:27px;border:1px solid var(--line);border-radius:25px;background:var(--surface);transition:transform .2s ease,box-shadow .2s ease}
.tool-symbol{display:grid;width:52px;height:52px;margin-bottom:33px;place-items:center;border:1px solid #c9e4f5;border-radius:15px;color:var(--accent);background:var(--accent-soft)}
.tool-card:nth-child(2) .tool-symbol{border-color:#ebd5c8;color:#a96048;background:var(--surface-warm)}
.tool-symbol svg{width:27px;height:27px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.tool-card h3{margin-bottom:7px;font-size:21px}

#screens{background:var(--surface)}
.screens-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));align-items:end;gap:clamp(20px,3vw,42px);max-width:920px;margin-inline:auto}
.screens-grid:focus-visible{outline:3px solid var(--accent-dark);outline-offset:4px}
.screen-card{display:flex;flex-direction:column;align-items:center;min-width:0}
.screen-art{position:relative;width:min(100%,240px);aspect-ratio:292/650;overflow:hidden;border-radius:12px;box-shadow:0 16px 32px rgba(35,34,37,.1)}
.screen-art img{position:absolute;inset:0;display:block;width:100%;height:100%;object-fit:cover;object-position:top}
.screen-copy{width:min(100%,240px);padding:19px 0 0;text-align:center}
.screen-card h3{margin-bottom:5px;font-size:20px}
.screen-card p{margin-bottom:0;font-size:15px;line-height:1.7}

#faq{background:linear-gradient(160deg,var(--surface-warm) 0%,var(--paper) 50%,#edf7fd 100%)}
.faq-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:36px;max-width:820px}
.faq-heading{margin:0 auto;text-align:center}
.faq-list{border-top:1px solid var(--line)}
.faq-list details{border-bottom:1px solid var(--line)}
.faq-list summary{position:relative;padding:25px 42px 25px 0;cursor:pointer;font-size:17px;font-weight:750;list-style:none}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"";position:absolute;right:2px;top:50%;width:18px;height:18px;transform:translateY(-50%);color:var(--accent);background:linear-gradient(currentColor,currentColor) center/18px 2px no-repeat,linear-gradient(currentColor,currentColor) center/2px 18px no-repeat}
.faq-list details[open] summary::after{background:linear-gradient(currentColor,currentColor) center/18px 2px no-repeat}
.faq-list details p{max-width:640px;margin:-4px 40px 24px 0;font-size:15px;line-height:1.85}

.download-panel{position:relative;display:flex;flex-direction:column;align-items:center;overflow:hidden;margin-top:86px;padding:46px 54px;border:1px solid #eddccf;border-radius:34px;background:var(--surface-warm)}
.download-panel::before{content:"";position:absolute;top:-170px;right:-100px;width:420px;aspect-ratio:1;border:1px solid rgba(225,185,153,.38);border-radius:50%;background:radial-gradient(circle,rgba(238,205,181,.28),transparent 70%);box-shadow:0 0 0 58px rgba(238,205,181,.11);pointer-events:none}
.download-copy{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center;width:100%;text-align:center}
.download-logo{display:block;width:72px;height:72px;margin-bottom:20px;border-radius:19px;object-fit:contain;background:var(--surface)}
.download-copy h2{margin-bottom:9px;font-size:clamp(30px,3.2vw,42px);line-height:1.2;letter-spacing:-.04em}
.download-copy p{margin-bottom:25px;font-size:16px}
.download-button{width:min(100%,300px);min-width:0}
.download-button .button-icon{width:22px;height:22px}
.site-footer{padding-block:28px;background:var(--surface)}
.footer-inner{display:flex;align-items:center;gap:28px}
.footer-inner p{margin:0 auto 0 0;font-size:14px}
.footer-inner>a:last-child{min-height:44px;display:inline-flex;align-items:center;color:var(--accent-dark);font-size:14px;font-weight:700}
.footer-inner>a:last-child:hover{text-decoration:underline;text-underline-offset:5px}

@media(max-width:1050px){
  html{scroll-padding-top:88px}
  .header-inner{min-height:76px;gap:18px}
  .brand{font-size:19px}
  .brand-image{width:44px;height:44px}
  .site-nav{gap:14px}
  .site-nav a{font-size:14px}
  .header-download{min-height:44px;padding-inline:16px;font-size:14px}
  .hero-stage{--fade-start:235px;--fade-end:440px;height:440px}
  .hero-media{width:520px}
  .tool-card{padding:22px}
}
@media(max-width:850px){
  .site-nav{display:none}
  .header-download{margin-left:auto}
  .section{padding-block:82px}
  .hero{padding-block:56px 0}
  .hero-stage{--fade-start:220px;--fade-end:420px;height:420px;margin-top:30px}
  .hero-media{width:min(66vw,440px)}
  .hero-feature{min-height:52px;gap:9px;padding:8px 12px}
  .hero-feature-left{left:-78px}
  .hero-feature-right{right:-54px}
  .hero-feature strong{font-size:13px}
  .feature-icon{width:24px;height:24px}
  .feature-icon-tools svg{width:21px;height:21px}
  .category-grid,.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .screens-grid{gap:16px}
  .screen-art,.screen-copy{width:min(100%,190px)}
  .screen-copy{padding-top:15px}
  .download-panel{padding:40px 32px}
}
@media(max-width:768px){
  .button-row{display:grid;grid-template-columns:minmax(0,1fr);width:100%;gap:9px}
  .button-row .button{width:100%;min-width:0}
  .button-row .button-secondary{min-height:48px;border-color:transparent;background:transparent}
}
@media(max-width:700px){
  html{scroll-padding-top:80px}
  .header-inner{min-height:68px;display:flex;justify-content:space-between;gap:12px;padding-block:8px}
  .site-nav{display:none}
  .brand{font-size:17px}
  .brand-image{width:40px;height:40px}
  .header-download{min-height:44px;margin-left:auto;padding-inline:14px;font-size:14px}
}
@media(max-width:650px){
  .container{width:min(100% - 32px,540px)}
  .section{padding-block:70px}
  .hero{padding-block:52px 0}
  .hero h1{margin-bottom:16px;font-size:clamp(37px,10vw,50px);line-height:1.25}
  .hero-title-sub{font-size:clamp(28px,8.2vw,39px)}
  .hero-description{margin-bottom:23px;font-size:15px}
  .hero-stage{--fade-start:175px;--fade-end:330px;height:330px;margin-top:20px}
  .hero-media{width:min(68vw,300px)}
  .hero-feature{min-height:32px;gap:5px;padding:5px 6px;border-radius:10px}
  .hero-feature-left{top:6%;left:-35px}
  .hero-feature-right{right:-31px}
  .hero-feature strong{font-size:13px}
  .feature-icon{width:18px;height:18px}
  .feature-icon-tools svg{width:17px;height:17px}
  .feature-icon-grid{grid-template-columns:repeat(2,5px);grid-template-rows:repeat(2,5px);gap:2px}
  .feature-icon-grid i{width:5px;height:5px;border-width:1px;border-radius:1px}
  .section-heading{margin-bottom:29px}
  .section-heading h2{font-size:clamp(28px,7.5vw,33px)}
  .section-heading p{font-size:15px}
  .library-browser{padding:18px;border-radius:23px}
  .library-browser-top{margin-bottom:17px;font-size:16px}
  .library-search{height:46px;margin-bottom:14px}
  .category-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}
  .tool-grid{grid-template-columns:1fr;gap:11px}
  .category-card{min-height:129px;padding:13px 8px;border-radius:16px}
  .category-symbol{width:43px;height:43px;margin-bottom:9px;border-radius:12px}
  .category-symbol svg{width:25px;height:25px}
  .category-card h3{font-size:16px}
  .tool-card h3{font-size:20px}
  .tool-card{display:flow-root;min-height:0;padding:20px}
  .tool-symbol{float:right;width:43px;height:43px;margin:0 0 8px 12px;border-radius:12px}
  .tool-symbol svg{width:23px;height:23px}
  .screens-grid{display:flex;align-items:flex-start;gap:18px;max-width:none;margin-inline:-16px;padding:0 16px 18px;overflow-x:auto;overscroll-behavior-inline:contain;scroll-snap-type:x mandatory;scroll-padding-inline:16px;scrollbar-width:thin;scrollbar-color:var(--accent) var(--accent-soft);-webkit-overflow-scrolling:touch}
  .screen-card{flex:0 0 min(64vw,240px);scroll-snap-align:start}
  .screen-art,.screen-copy{width:min(100%,240px)}
  .screen-card:not(:nth-child(2)) .screen-art{aspect-ratio:292/650}
  .screen-copy{padding-top:15px}
  .screen-card h3{font-size:19px}
  .faq-grid{gap:22px}
  .faq-list summary{font-size:16px}
  .faq-list details p{font-size:15px}
  .download-panel{margin-top:62px;padding:30px 22px;border-radius:25px}
  .download-panel::before{top:-115px;right:-135px;width:300px}
  .download-logo{width:62px;height:62px;margin-bottom:17px;border-radius:17px}
  .download-copy h2{font-size:27px}
  .download-copy p{margin-bottom:22px;font-size:15px}
  .download-copy .button{width:min(100%,300px)}
  .footer-inner{display:grid;grid-template-columns:1fr auto;gap:8px}
  .footer-inner p{grid-column:1/-1;grid-row:2}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .button,.category-card,.tool-card{transition:none}
}