:root{color-scheme:light;--paper:#fff8f2;--mist:#f8e7e1;--ink:#3a2230;--muted:#765d69;--wine:#9d4b68;--border:#dabfc0;--gold:#916037;--serif:"Songti SC","STSong","Noto Serif CJK SC","SimSun",serif;--sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}
*,*::before,*::after{box-sizing:border-box}html{background:var(--paper);scroll-behavior:smooth;scroll-padding-top:6rem}body{margin:0;color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.8;-webkit-font-smoothing:antialiased}h1,h2,h3,p,figure{margin:0}a{color:inherit;text-underline-offset:.25em}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit}img{display:block;max-width:100%;height:auto}[hidden]{display:none!important}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--wine);outline-offset:5px;border-radius:5px}.section-shell{width:min(1120px,calc(100% - 48px));margin-inline:auto}.skip-link{position:fixed;top:12px;left:12px;z-index:100;background:var(--paper);padding:12px 18px;transform:translateY(-180%)}.skip-link:focus{transform:translateY(0)}
.site-header{position:sticky;z-index:20;top:0;border-bottom:1px solid #dabfc066;background:#fff8f2f2;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px)}.nav-shell{width:min(1200px,calc(100% - 48px));margin:auto;min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding-top:env(safe-area-inset-top)}.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;font-family:var(--serif);font-size:24px;font-weight:600;letter-spacing:.12em;min-height:44px;flex-shrink:0}.nav-links{display:flex;gap:30px}.nav-links a,.nav-action{display:inline-flex;align-items:center;min-height:44px;text-decoration:none;font-size:14px;font-weight:500}.nav-links a{color:var(--muted)}.nav-action{gap:14px;border:1px solid var(--border);border-radius:100px;padding:8px 20px}.nav-links a:hover,.text-link:hover{color:var(--wine)}
.hero{position:relative;display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:48px;padding-block:82px 100px}.hero::before{content:"";position:absolute;z-index:-1;inset:-76px -24px 0;border-radius:0 0 50% 50%;background:radial-gradient(ellipse at 80% 50%,#eecbc480,transparent 60%)}.preview-label{display:inline-flex;align-items:center;gap:8px;color:var(--muted);font-size:12px;line-height:1.5;padding:7px 12px;border:1px solid var(--border);border-radius:99px;margin-bottom:30px}.status-dot{width:6px;height:6px;background:var(--wine);border-radius:50%}.eyebrow{font-size:12px;letter-spacing:.2em;color:var(--gold);margin-bottom:16px;font-weight:600}.hero h1{font-family:var(--serif);font-weight:500;font-size:clamp(42px,4.8vw,64px);letter-spacing:.015em;line-height:1.25}.hero h1 em{font-style:normal;color:var(--wine)}.hero-description{margin-top:24px;color:var(--muted);font-size:17px;line-height:1.9}.hero-actions{display:flex;align-items:center;gap:24px;margin-top:32px}.button{display:inline-flex;justify-content:center;align-items:center;gap:20px;min-height:52px;padding:13px 24px;line-height:1.5;border:0;border-radius:100px;text-decoration:none;font-size:15px;font-weight:600;cursor:pointer;transition:background-color .18s,transform .18s;max-width:100%;text-align:center}.button-primary{background:var(--wine);color:#fff;box-shadow:0 8px 24px #9d4b6818}.button-primary:hover{background:#863c56}.button:active{transform:translateY(1px)}.button:disabled{cursor:wait;background:#765d69}.text-link{min-height:44px;display:inline-flex;align-items:center;font-size:14px}.hero-note{color:var(--muted);font-size:12px;line-height:1.8;margin-top:22px}
.letter-stage{position:relative;padding:50px 20px 20px;isolation:isolate}.letter-stage::before{content:"";position:absolute;z-index:-2;inset:0;border-radius:50%;background:radial-gradient(ellipse,#e7c8d28c 0%,#eecbc443 44%,transparent 70%)}.path-line{position:absolute;width:70%;height:85%;border:1px solid #ad7a4566;border-radius:50%;transform:rotate(25deg);left:12%;top:0;z-index:-1}.future-letter{max-width:420px;margin:auto;padding:30px 34px 28px;background:linear-gradient(135deg,#fffdf9,#fff8f2);border:1px solid #fff;border-radius:5px 5px 38px 5px;box-shadow:0 24px 60px #765d691c;transform:rotate(-3deg)}.letter-top{display:flex;align-items:center;justify-content:space-between;gap:16px;color:var(--gold);font-size:11px;letter-spacing:.12em;padding-bottom:28px;border-bottom:1px solid #dabfc080}.letter-seal{font-family:var(--serif);display:grid;place-items:center;border:1px solid var(--border);border-radius:50%;width:30px;height:30px;color:var(--wine)}.letter-salutation{font-size:12px;color:var(--muted);margin-top:32px}.letter-quote{font-family:var(--serif);font-size:clamp(24px,2.2vw,30px);line-height:1.8;letter-spacing:.03em;margin-top:14px}.letter-bottom{border-top:1px solid #dabfc080;margin-top:42px;padding-top:18px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:10px;color:var(--muted)}.scene-caption{color:var(--muted);font-size:11px;margin-top:32px;text-align:center;letter-spacing:.08em}.scene-caption span{color:var(--gold);margin-right:12px}
.experience,.features,.how,.faq{padding-block:80px}.section-heading{text-align:center;max-width:700px;margin:0 auto 48px}.section-heading h2,.download h2{font-family:var(--serif);font-size:clamp(30px,3.3vw,44px);font-weight:500;line-height:1.4;letter-spacing:.015em}.section-heading>p:last-child:not(.eyebrow){color:var(--muted);font-size:15px;line-height:1.9;margin-top:18px}.experience{border-top:1px solid #dabfc066}.app-gallery{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:44px;max-width:880px;margin:auto;align-items:start}.app-gallery figure{min-width:0}.phone-frame{background:#30202a;border:7px solid #30202a;border-radius:34px;overflow:hidden;box-shadow:0 18px 38px #765d691a}.phone-frame img{width:100%;aspect-ratio:402/874;object-fit:cover}.app-gallery figcaption{margin-top:20px;text-align:center;font-size:14px;color:var(--muted)}.app-gallery figcaption span{font-size:11px;color:var(--gold);margin-right:10px}.gallery-note,.section-footnote{text-align:center;font-size:12px;color:var(--muted);margin-top:28px;line-height:1.8}.audio-sample{max-width:760px;margin:52px auto 0;padding:28px 32px;background:#f8e7e180;border:1px solid #dabfc080;border-radius:26px}.audio-heading{display:flex;gap:18px;align-items:center}.audio-symbol{display:grid;place-items:center;width:48px;height:48px;border-radius:50%;background:#fff8f2;font-size:22px;color:var(--wine);flex-shrink:0}.audio-heading h3{font-size:18px;font-weight:500}.audio-heading p{font-size:12px;color:var(--muted);margin-top:3px}.audio-player{display:flex;gap:20px;align-items:center;margin-top:22px}.audio-player audio{width:100%;max-width:360px}.audio-status{font-size:12px;color:var(--muted);line-height:1.7}.transcript{margin-top:24px;padding-top:18px;border-top:1px solid #dabfc080}.transcript summary,.browser-help summary{cursor:pointer;min-height:44px;display:flex;align-items:center;gap:12px;color:var(--muted);font-size:13px;list-style:none}.transcript summary::after,.browser-help summary::after{content:"+";margin-left:auto;font-size:20px}.transcript[open] summary::after,.browser-help[open] summary::after{content:"−"}.transcript p{font-size:15px;line-height:2;color:var(--ink);padding-block:12px 8px}
.features{background:transparent}.feature-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.feature-card{padding:30px;border:1px solid #dabfc080;border-radius:24px;background:#fffdf9;min-width:0}.feature-number{font-family:var(--serif);font-size:18px;color:var(--gold);display:block;margin-bottom:24px}.feature-card h3{font-family:var(--serif);font-size:23px;font-weight:500;margin-bottom:14px}.feature-card p{font-size:14px;line-height:1.9;color:var(--muted);overflow-wrap:anywhere}.how{border-block:1px solid #dabfc066}.steps{list-style:none;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px;margin:0;padding:0}.steps li{padding:4px 20px;text-align:center;min-width:0}.step-number{display:grid;place-items:center;width:44px;height:44px;margin:0 auto 22px;background:#f8e7e1;border:1px solid #dabfc080;border-radius:50%;color:var(--wine);font-family:var(--serif);font-size:21px}.steps h3{font-size:17px;font-weight:500;margin-bottom:12px}.steps p{font-size:14px;line-height:1.9;color:var(--muted)}
.faq-list{max-width:760px;margin:auto;border-top:1px solid var(--border)}.faq-list details{border-bottom:1px solid var(--border)}.faq-list summary{padding:21px 0;min-height:64px;display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:16px;cursor:pointer;list-style:none}.faq-list summary::-webkit-details-marker,.transcript summary::-webkit-details-marker,.browser-help summary::-webkit-details-marker{display:none}.faq-list summary::after{content:"+";font-size:22px;color:var(--wine);flex-shrink:0}.faq-list details[open] summary::after{content:"−"}.answer{padding:0 28px 22px 0;color:var(--muted);font-size:14px;line-height:2;overflow-wrap:anywhere}
.download{padding-block:32px 88px}.download-panel{padding:64px 32px 38px;text-align:center;background:linear-gradient(135deg,#f8e7e1,#f0dbd3);border:1px solid #dabfc080;border-radius:32px}.download-mark{margin:0 auto 24px}.download-state{font-size:14px;color:var(--muted);margin:24px auto 20px;max-width:36rem}.download-note{color:var(--muted);font-size:12px;line-height:1.9;margin:20px auto 0;max-width:34rem}.browser-help{max-width:380px;margin:20px auto 0;text-align:left;border-top:1px solid #dabfc080}.browser-help p{color:var(--muted);font-size:12px;line-height:1.9;margin-top:8px}.site-footer{border-top:1px solid #dabfc080;padding-block:30px calc(28px + env(safe-area-inset-bottom))}.footer-top{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:20px}.footer-top nav{display:flex;gap:22px;flex-wrap:wrap}.footer-top nav a{display:flex;align-items:center;min-height:44px;color:var(--muted);font-size:12px;text-decoration:none}.site-footer>p{color:var(--muted);font-size:11px;line-height:1.9}
@media(min-width:900px){.app-gallery figure:nth-child(2){transform:translateY(-12px)}}
@media(max-width:900px){.nav-links{gap:18px}.hero{gap:20px;padding-block:56px 72px}.hero h1{font-size:46px}.hero-actions{gap:14px}.future-letter{padding:26px}.letter-stage{padding:35px 8px 10px}.letter-quote{font-size:25px}.app-gallery{gap:24px}.feature-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.steps{gap:16px}.steps li{padding-inline:4px}}
@media(max-width:640px){html{scroll-padding-top:5.5rem}.section-shell,.nav-shell{width:calc(100% - 40px)}.nav-shell{min-height:68px;gap:10px}.brand{font-size:21px;gap:8px}.brand img{width:29px}.nav-links{display:none}.nav-action{font-size:12px;padding:8px 14px;gap:10px}.hero{grid-template-columns:1fr;padding-block:34px 52px;gap:24px}.hero-copy{text-align:center}.preview-label{margin-bottom:24px;font-size:11px}.hero .eyebrow{font-size:11px;margin-bottom:16px}.hero h1{font-size:clamp(36px,9.5vw,44px)}.hero-description{font-size:15px;margin-top:20px}.hero-actions{justify-content:center;gap:18px;flex-wrap:wrap;margin-top:26px}.hero-actions .button{font-size:14px;padding-inline:22px}.hero-note{font-size:11px;margin-top:18px}.letter-stage{padding:26px 16px 8px;max-width:380px;width:100%;margin:auto}.future-letter{padding:25px 26px}.letter-top{font-size:10px;padding-bottom:20px}.letter-salutation{margin-top:24px}.letter-quote{font-size:24px}.letter-bottom{margin-top:28px;font-size:9px}.scene-caption{font-size:10px;margin-top:24px}.experience,.features,.how,.faq{padding-block:56px}.section-heading{margin-bottom:32px}.section-heading h2,.download h2{font-size:30px}.section-heading>p:last-child:not(.eyebrow){font-size:14px}.app-gallery{grid-template-columns:1fr;gap:34px;max-width:258px}.app-gallery figcaption{margin-top:15px}.phone-frame{border-radius:34px}.gallery-note,.section-footnote{font-size:11px}.audio-sample{margin-top:34px;padding:24px 20px}.audio-heading{gap:12px}.audio-heading h3{font-size:16px}.audio-heading p{font-size:11px}.audio-symbol{width:40px;height:40px}.audio-player{flex-direction:column;align-items:flex-start;gap:12px}.audio-player .button{width:100%}.transcript p{font-size:14px}.feature-grid{grid-template-columns:1fr;gap:14px}.feature-card{padding:25px}.feature-number{margin-bottom:16px}.feature-card h3{font-size:23px;margin-bottom:10px}.steps{grid-template-columns:1fr;gap:36px}.steps li{padding:0}.step-number{margin-bottom:16px}.faq-list summary{font-size:15px;padding-block:20px}.answer{font-size:13px;padding-right:8px}.download{padding-block:12px 56px}.download-panel{padding:40px 20px 26px;border-radius:26px}.download-panel .button{padding-inline:18px;font-size:14px}.download-state{font-size:13px}.download-note{font-size:11px}.footer-top{align-items:flex-start;flex-direction:column;gap:12px}.footer-top nav{gap:8px 22px}.site-footer>p{font-size:10px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button{transition:none}.button:active{transform:none}}
@media(max-width:640px){.hero::before{left:-20px;right:-20px}.letter-stage{overflow:clip}}
@media(forced-colors:active){.button,.preview-label,.feature-card,.phone-frame,.download-panel{border:1px solid CanvasText}.button-primary{background:ButtonFace;color:ButtonText}.path-line{display:none}}
.download-panel{--muted:#6c5360}