@font-face{font-family:"CI Serif";src:url(../fonts/noto-serif-sc-700.woff2) format("woff2");font-weight:700;font-display:swap}

:root{
 --bg:#fafaf9;--bg-alt:#f2f2ef;--paper:#fff;--ink:#121316;--muted:#5d5e63;--faint:#8b8c90;--line:#e3e3df;
 --navy:#141b38;--navy-soft:#eceef5;--red:#e5484d;--green:#2fb26b;--blue:#2f6bff;
 --serif:"Songti SC","STSong","CI Serif","Noto Serif CJK SC","Noto Serif SC",serif;
 --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
 --max:1240px;--gutter:28px;--radius:12px;
 --shadow:0 30px 60px -24px rgba(20,27,56,.28),0 2px 6px rgba(0,0,0,.04);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;color-scheme:light}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.75 var(--sans);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3,[data-serif]{font-family:var(--serif);font-weight:700;letter-spacing:-.02em;text-wrap:balance}
h1{font-size:clamp(40px,6vw,76px);line-height:1.1;margin:0}
h2{font-size:clamp(30px,3.4vw,46px);line-height:1.18;margin:0 0 18px}
h3{font-size:clamp(22px,2.2vw,28px);line-height:1.3;margin:0 0 12px}
p{margin:0 0 14px}
img,video{display:block;max-width:100%;height:auto}
a{color:inherit}
[hidden]{display:none!important}
:focus-visible{outline:3px solid var(--blue);outline-offset:3px}
.skip-link{position:fixed;z-index:100;left:16px;top:10px;transform:translateY(-200%);background:var(--ink);color:#fff;padding:10px 16px;border-radius:8px}
.skip-link:focus{transform:none}
.note{font-size:13px;color:var(--faint)}

/* buttons */
.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:10px 20px;border-radius:10px;font:700 15px/1.2 var(--sans);text-decoration:none;cursor:pointer;border:1px solid transparent;transition:background .2s ease,border-color .2s ease,color .2s ease}
.button.primary{background:var(--navy);color:#fff}
.button.primary:hover{background:#222b52}
.button.secondary{background:var(--paper);color:var(--ink);border-color:#d6d6d2}
.button.secondary:hover{border-color:var(--ink)}
.button.small{min-height:36px;padding:6px 14px;font-size:14px}

/* header */
.site-header{position:sticky;top:0;z-index:20;height:64px;display:flex;align-items:center;gap:32px;padding:0 max(var(--gutter),calc((100vw - var(--max))/2));background:rgba(250,250,249,.86);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid var(--line)}
.brand{display:inline-flex;align-items:center;gap:6px;font-weight:800;font-size:16px;text-decoration:none;letter-spacing:-.01em}
.brand-mark{font-family:var(--serif);font-size:24px;line-height:1;color:var(--navy)}
.site-header nav{display:flex;gap:28px;margin-left:auto;font-size:14px}
.site-header nav a{text-decoration:none;color:var(--muted)}
.site-header nav a:hover{color:var(--ink)}

/* app window frame */
.app-window{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--paper);box-shadow:var(--shadow)}
.window-bar{height:34px;display:flex;align-items:center;gap:7px;padding:0 12px;border-bottom:1px solid var(--line);font-size:12px;color:var(--faint);background:#fcfcfb}
.window-bar span{width:10px;height:10px;border-radius:50%;background:#e1e1dd}
.window-bar b{font-weight:500;margin-left:auto}
.zoom-shot{display:block;width:100%;padding:0;border:0;background:none;cursor:zoom-in}

/* hero */
.hero{max-width:var(--max);margin:auto;padding:76px var(--gutter) 0;text-align:center}
.kicker{display:inline-flex;align-items:center;flex-wrap:wrap;justify-content:center;gap:10px;font-size:14px;font-weight:700;color:var(--navy);margin:0 0 22px}
.dots{display:inline-flex;gap:4px}
.dots i{width:7px;height:7px;border-radius:50%}
.dots i:nth-child(1){background:var(--red)}.dots i:nth-child(2){background:var(--green)}.dots i:nth-child(3){background:var(--blue)}
.chip{display:inline-flex;align-items:center;height:26px;padding:0 10px;border-radius:999px;background:var(--navy-soft);color:var(--navy);font-size:12px;font-weight:700}
.lead{font-size:clamp(16px,1.5vw,19px);line-height:1.85;color:var(--muted);max-width:640px;margin:22px auto 30px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.hero-window{max-width:1100px;margin:52px auto -150px;position:relative;z-index:1}

/* case intro */
.case-intro{background:var(--bg-alt);padding:214px var(--gutter) 40px}
.narrow{max-width:720px;margin:auto;text-align:center}
.case-intro p{font-size:17px;color:var(--muted)}

/* story */
.story{background:var(--bg-alt);display:grid;grid-template-columns:minmax(0,.62fr) minmax(0,1.38fr);gap:56px;padding:24px max(var(--gutter),calc((100vw - 1320px)/2)) 96px}
.story-window{grid-column:2;grid-row:1;position:sticky;top:max(84px,calc(50vh - 300px));align-self:start}
.story-steps{grid-column:1;grid-row:1}
.window-screen{position:relative;aspect-ratio:1440/900;overflow:hidden;background:var(--bg)}
.screen{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity .3s ease}
.screen.is-active{opacity:1}
.spotlight{position:absolute;left:var(--x);top:var(--y);width:var(--w);height:var(--h);border-radius:8px;box-shadow:0 0 0 2px var(--navy),0 0 0 9999px rgba(18,19,22,.36);pointer-events:none}
.callouts{position:absolute;left:14px;bottom:14px;margin:0;padding:0;list-style:none;display:grid;gap:6px;counter-reset:c}
.callouts li{counter-increment:c;justify-self:start;background:var(--navy);color:#fff;font-size:13px;font-weight:700;line-height:1.2;padding:7px 12px 7px 8px;border-radius:999px;box-shadow:0 6px 18px rgba(20,27,56,.25)}
.callouts li::before{content:counter(c);display:inline-grid;place-items:center;width:18px;height:18px;margin-right:8px;border-radius:50%;background:#fff;color:var(--navy);font-size:11px}
.step{min-height:72vh;display:flex;flex-direction:column;justify-content:center;max-width:400px;opacity:.36;transition:opacity .3s ease}
.step.is-current{opacity:1}
.step-sub{min-height:52vh}
.step p{color:var(--muted)}
.stage-no{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:700;letter-spacing:.04em;color:var(--navy);margin:0 0 14px}
.stage-no i{width:8px;height:8px;border-radius:50%}
.tone-red{background:var(--red)}.tone-green{background:var(--green)}.tone-blue{background:var(--blue)}.tone-navy{background:var(--navy)}
.step-detail{display:none;margin:18px 0 0}
.step-detail img{border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow)}

/* template strip */
.template-strip{max-width:var(--max);margin:auto;padding:112px var(--gutter);display:grid;grid-template-columns:minmax(0,.7fr) minmax(0,1.3fr);gap:56px;align-items:center}
.strip-copy p{color:var(--muted)}
.template-strip video{width:100%;aspect-ratio:1440/900;background:var(--bg)}

/* matrix */
.matrix{background:var(--bg-alt);padding:112px max(var(--gutter),calc((100vw - var(--max))/2))}
.matrix-copy{max-width:640px;margin-bottom:40px}
.matrix-copy p{color:var(--muted)}
.matrix-shots{display:grid;gap:20px}

/* recap */
.recap{max-width:var(--max);margin:auto;padding:120px var(--gutter);text-align:center}
.recap-stats{list-style:none;margin:0 auto 28px;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));max-width:760px}
.recap-stats li{display:grid;gap:4px;padding:8px 0;border-left:1px solid var(--line)}
.recap-stats li:first-child{border-left:0}
.recap-stats b{font-size:clamp(48px,6vw,80px);line-height:1;color:var(--navy)}
.recap-stats span{font-size:15px;color:var(--muted)}
.recap-line{font-size:clamp(20px,2vw,26px);margin:0}
.recap-window{max-width:1100px;margin:48px auto 0;text-align:left}
.timings-line{max-width:720px;margin:20px auto 0;font-size:14px;color:var(--faint)}

/* start */
.start{max-width:var(--max);margin:auto;padding:0 var(--gutter) 112px;display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,.7fr);gap:24px;align-items:start}
.start-main,.qq{background:var(--paper);border:1px solid var(--line);border-radius:16px;padding:40px}
.start-steps{list-style:none;margin:8px 0 28px;padding:0;display:grid;gap:14px;counter-reset:s}
.start-steps li{counter-increment:s;display:grid;grid-template-columns:32px 1fr;column-gap:12px}
.start-steps li::before{content:counter(s);grid-row:span 2;display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--navy-soft);color:var(--navy);font-weight:800;font-size:13px}
.start-steps b{font-weight:700}
.start-steps span{grid-column:2;font-size:14px;color:var(--muted)}
.download{display:grid;gap:10px}
.download-item{display:grid;gap:2px;padding:14px 18px;border:1px solid var(--line);border-radius:12px;text-decoration:none;background:var(--paper);transition:border-color .2s ease,background .2s ease}
a.download-item:hover{border-color:var(--ink)}
.download-item b{font-size:16px}
.download-item .meta{font-size:13px;color:var(--muted)}
.download-item small{font-size:12px;color:var(--faint)}
.download-item.is-primary{background:var(--navy);border-color:var(--navy);color:#fff}
.download-item.is-primary .meta,.download-item.is-primary small{color:rgba(255,255,255,.72)}
a.download-item.is-primary:hover{background:#222b52}
.download-item.is-unavailable{border-style:dashed;background:transparent;color:var(--muted)}
.download-item.is-unavailable.is-primary{background:var(--navy-soft);border-color:#c9cde0;color:var(--navy)}
.download-item.is-unavailable.is-primary .meta,.download-item.is-unavailable.is-primary small{color:var(--muted)}
.wechat-desktop-tip,.mobile-tip{padding:16px 18px;border-radius:12px;background:var(--navy-soft);color:var(--navy);font-size:15px}
.mobile-tip .button{margin-top:6px}
.qq{text-align:center;display:grid;justify-items:center;gap:12px}
.qq h3{font-size:20px;margin:0}
.qq img{width:200px;height:auto;border:1px solid var(--line);border-radius:12px;padding:8px;background:#fff}
.qq-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:8px}
.qq .note{margin:0}

/* fit */
.fit{max-width:var(--max);margin:auto;padding:0 var(--gutter) 112px;display:grid;grid-template-columns:1fr 1fr;gap:24px}
.fit-card{border:1px solid var(--line);border-radius:16px;padding:36px 40px;background:var(--paper)}
.fit-card h2{font-size:clamp(24px,2.4vw,32px)}
.fit-card ul{margin:0;padding:0;list-style:none;display:grid;gap:10px}
.fit-card li{display:flex;gap:10px;align-items:baseline}
.fit-card li::before{content:"";flex:none;width:6px;height:6px;border-radius:50%;background:var(--green);transform:translateY(-2px)}
.muted-card{background:var(--bg-alt)}
.muted-card li::before{background:var(--faint)}

/* faq */
.faq{max-width:var(--max);margin:auto;padding:0 var(--gutter) 112px;display:grid;grid-template-columns:minmax(0,.6fr) minmax(0,1.4fr);gap:56px}
.faq-list details{border-top:1px solid var(--line)}
.faq-list details:last-child{border-bottom:1px solid var(--line)}
.faq-list summary{list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:20px 0;font-weight:700;cursor:pointer}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";font-size:22px;font-weight:400;color:var(--navy);transition:transform .2s ease}
.faq-list details[open] summary::after{transform:rotate(45deg)}
.faq-list details p{color:var(--muted);padding:0 40px 20px 0;margin:0}

/* booklet */
.booklet{max-width:var(--max);margin:0 auto 112px;padding:44px 48px;display:flex;align-items:center;justify-content:space-between;gap:32px;border-radius:16px;background:var(--navy);color:#fff}
.booklet h2{font-size:clamp(24px,2.6vw,34px);margin-bottom:10px}
.booklet p{color:rgba(255,255,255,.74);margin:0;max-width:680px}
.booklet .button.secondary{flex:none;background:#fff;border-color:#fff}

/* footer */
.site-footer{border-top:1px solid var(--line);padding:36px max(var(--gutter),calc((100vw - var(--max))/2));display:flex;align-items:center;gap:24px;font-size:14px;color:var(--muted)}
.site-footer p{margin:0}
.site-footer .icp{margin-left:auto;text-decoration:none;color:var(--faint)}
.site-footer .icp:hover{color:var(--ink)}

/* screenshot dialog */
.shot-dialog{width:min(96vw,1600px);max-height:92vh;padding:0;border:0;border-radius:12px;background:#111;box-shadow:0 30px 90px rgba(0,0,0,.5)}
.shot-dialog::backdrop{background:rgba(12,13,16,.78)}
.dialog-scroll{max-height:92vh;overflow:auto}
.dialog-close{position:absolute;right:12px;top:12px;z-index:1;width:40px;height:40px;border-radius:50%;border:0;background:rgba(255,255,255,.92);font-size:22px;cursor:pointer}

@media (prefers-reduced-motion:reduce){
 html{scroll-behavior:auto}
 .screen,.spotlight,.step,.button,.download-item{transition:none}
}

@media (max-width:900px){
 :root{--gutter:16px}
 .site-header{gap:16px}
 .site-header nav{display:none}
 .site-header .button{margin-left:auto}
 .hero{padding-top:52px}
 .hero-window{margin:36px 0 -64px}
 .case-intro{padding:104px var(--gutter) 8px}
 .story{display:block;padding:8px var(--gutter) 72px}
 .story-window{display:none}
 .step,.step-sub{min-height:0;max-width:none;opacity:1;padding:40px 0 0}
 .step-detail{display:block}
 .template-strip{grid-template-columns:1fr;gap:24px;padding:72px var(--gutter)}
 .matrix{padding:72px var(--gutter)}
 .matrix-shots{grid-template-columns:1fr}
 .recap{padding:80px var(--gutter)}
 .start{grid-template-columns:1fr;padding-bottom:72px}
 .start-main,.qq{padding:28px 22px}
 .fit{grid-template-columns:1fr;padding-bottom:72px}
 .fit-card{padding:28px 22px}
 .faq{grid-template-columns:1fr;gap:12px;padding-bottom:72px}
 .booklet{flex-direction:column;align-items:flex-start;margin:0 var(--gutter) 72px;padding:32px 24px}
 .site-footer{flex-wrap:wrap;gap:8px 16px}
 .site-footer .icp{margin-left:0;width:100%}
}
@media (max-width:430px){
 .recap-stats{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:16px}
 .recap-stats li:nth-child(3){border-left:0}
}