:root{--paper:#f7f7f4;--ink:#151822;--muted:#626773;--line:#d9dce2;--blue:#133fd1;--blue-dark:#0b216f;--coral:#ff7152;--white:#fff;--radius:22px;--sans:"Segoe UI","Microsoft YaHei UI",Arial,sans-serif;--display:"Arial Narrow","Microsoft YaHei UI",sans-serif}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);line-height:1.68}
img{max-width:100%}
a{color:inherit;text-decoration:none}
button,a{font:inherit}
.skip{position:fixed;left:16px;top:-80px;z-index:99;background:var(--ink);color:#fff;padding:10px 16px}.skip:focus{top:16px}
:focus-visible{outline:3px solid var(--coral);outline-offset:4px}
.topbar{height:82px;padding:0 clamp(20px,5vw,76px);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;border-bottom:1px solid var(--line);background:rgba(247,247,244,.96);position:sticky;top:0;z-index:20}
.wordmark{display:flex;align-items:center;gap:10px;font-weight:750;letter-spacing:-.04em;font-size:20px}.wordmark>span{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--blue);color:#fff;font-size:13px}.wordmark small{font:600 9px/1 var(--sans);letter-spacing:.16em;color:var(--muted);margin-left:4px}
.topbar nav{display:flex;align-items:center;gap:32px;font-size:13px;color:#414653}.topbar nav a{position:relative}.topbar nav a:hover:after,.topbar nav a[aria-current]:after{content:"";position:absolute;height:2px;background:var(--blue);left:0;right:0;bottom:-9px}
.pill{justify-self:end;padding:9px 17px;border:1px solid var(--ink);border-radius:999px;font-weight:650;font-size:13px;white-space:nowrap}
.pill:hover{background:var(--ink);color:#fff}
.overline{margin:0 0 18px;color:var(--blue);font-size:11px;line-height:1.3;font-weight:750;letter-spacing:.18em}
.hero{min-height:700px;display:grid;grid-template-columns:minmax(0,.86fr) minmax(520px,1.14fr);gap:clamp(28px,6vw,96px);align-items:center;padding:clamp(68px,9vw,132px) clamp(20px,5vw,76px)}
.hero-copy{max-width:650px}.hero h1,.download-intro h1,.help-index h1{font-family:var(--display);font-size:clamp(48px,6vw,92px);font-weight:560;letter-spacing:-.065em;line-height:1.02;margin:0}.hero h1 em{font-style:normal;color:var(--blue)}
.hero-text{max-width:590px;margin:30px 0 34px;font-size:17px;color:var(--muted)}
.actions{display:flex;align-items:center;gap:26px;flex-wrap:wrap}.button{display:inline-flex;min-width:150px;min-height:48px;padding:0 22px;align-items:center;justify-content:center;background:var(--blue);border:1px solid var(--blue);border-radius:999px;color:#fff;font-weight:700;font-size:13px;white-space:nowrap;word-break:keep-all;writing-mode:horizontal-tb}.button:hover{background:var(--blue-dark);border-color:var(--blue-dark)}.button.outline{background:transparent;color:var(--ink);border-color:var(--line)}.button.outline:hover{border-color:var(--blue);color:var(--blue)}.button.light{background:#fff;color:var(--blue);border-color:#fff}.text-action{font-weight:700;color:var(--blue);font-size:13px}
.hero-media{margin:0}.hero-media img{border-radius:var(--radius)}.hero-media figcaption{display:flex;justify-content:space-between;gap:20px;margin-top:12px;color:var(--muted);font-size:11px}.hero-media figcaption span{font-weight:750;color:var(--ink);letter-spacing:.14em}
.platforms{display:grid;grid-template-columns:1fr 2fr;gap:24px;align-items:center;padding:24px clamp(20px,5vw,76px);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.platforms strong{font-size:13px}.platforms div{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--muted);font-size:12px;letter-spacing:.04em}
.evidence{margin:clamp(60px,9vw,130px) clamp(20px,5vw,76px);padding:clamp(28px,4vw,58px);background:var(--white);border-radius:var(--radius);display:grid;grid-template-columns:.8fr 1fr 1.25fr;gap:clamp(28px,5vw,76px);align-items:start}.evidence h2{font-size:clamp(27px,3vw,42px);letter-spacing:-.045em;line-height:1.1;margin:0}.evidence>p{margin:37px 0 0;color:var(--muted)}.evidence dl{margin:0}.evidence dl div{display:grid;grid-template-columns:75px 1fr;gap:18px;padding:14px 0;border-bottom:1px solid var(--line)}.evidence dt{font-weight:750}.evidence dd{margin:0;color:var(--muted);font-size:13px}
.capability-ledger{display:grid;grid-template-columns:.72fr 1.28fr;gap:clamp(44px,8vw,132px);padding:clamp(70px,10vw,150px) clamp(20px,5vw,76px);background:var(--ink);color:#fff}.capability-ledger>header{position:sticky;top:130px;align-self:start}.capability-ledger h2,.method h2,.line-note h2,.voices h2,.plans h2,.faq h2,.closing h2,.install-strip h2,.account-note h2{font-size:clamp(35px,4.5vw,64px);line-height:1.07;letter-spacing:-.055em;margin:0}.capability-ledger>header>p:last-child{color:#a9afba;max-width:420px}.ledger article{display:grid;grid-template-columns:150px 120px 1fr;gap:28px;padding:32px 0;border-top:1px solid #3a3e48;align-items:start}.ledger b{font-size:22px}.ledger span{color:#8fa8ff;font-size:12px;letter-spacing:.1em}.ledger p{margin:0;color:#b8bdc7}
.method{display:grid;grid-template-columns:.68fr 1.32fr;gap:clamp(38px,7vw,110px);align-items:center;padding:clamp(80px,12vw,180px) clamp(20px,5vw,76px)}.method-copy{max-width:520px}.method-copy>p:not(.overline){color:var(--muted);margin:28px 0}.method figure{margin:0}.method figure img{display:block;border-radius:var(--radius)}
.line-note{display:grid;grid-template-columns:260px 1fr;gap:clamp(36px,8vw,130px);margin:0 clamp(20px,5vw,76px);padding:clamp(45px,6vw,88px);background:#e9ecf8;border-radius:var(--radius)}.line-note aside{display:flex;flex-direction:column;justify-content:space-between;border-right:1px solid #cbd0df;padding-right:36px}.line-note aside span,.line-note aside small{font-size:11px;letter-spacing:.14em}.line-note aside strong{font-size:70px;letter-spacing:-.07em;color:var(--blue)}.line-note>div{max-width:850px}.line-note>div>p:not(.overline){color:var(--muted);font-size:17px}.checks{display:flex;gap:8px;flex-wrap:wrap;margin:28px 0}.checks span{padding:8px 12px;background:#fff;border-radius:999px;font-size:12px}
.voices{padding:clamp(90px,12vw,180px) clamp(20px,5vw,76px)}.voices>header{display:grid;grid-template-columns:.35fr 1fr .7fr;gap:30px;align-items:end;margin-bottom:60px}.voices>header .overline{align-self:start}.voices>header p:last-child{color:var(--muted)}.voice-row{display:grid;grid-template-columns:1fr 1.15fr .9fr;gap:1px;background:var(--line);border:1px solid var(--line)}.voice-row blockquote{margin:0;background:var(--paper);padding:clamp(28px,4vw,58px);min-height:300px;display:flex;flex-direction:column;justify-content:space-between}.voice-row blockquote p{font-size:clamp(19px,2vw,27px);line-height:1.5;letter-spacing:-.025em}.voice-row footer{display:flex;flex-direction:column}.voice-row footer span{font-size:11px;color:var(--muted);margin-top:5px}
.plans{padding:clamp(80px,10vw,150px) clamp(20px,5vw,76px);background:#fff}.plans>header{max-width:820px;margin-bottom:64px}.plans>header>p:last-child{color:var(--muted)}.plan-list{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;align-items:stretch}.plan-list article{padding:34px;border:1px solid var(--line);border-radius:var(--radius);display:flex;flex-direction:column}.plan-list article.selected{background:var(--blue);color:#fff;border-color:var(--blue);transform:translateY(-18px)}.plan-list article>span{font-size:11px;letter-spacing:.14em;color:var(--muted)}.plan-list .selected>span{color:#bfcaff}.plan-list h3{font-size:42px;letter-spacing:-.05em;margin:12px 0}.plan-list p{min-height:54px}.plan-list ul{padding-left:18px;color:var(--muted);flex:1}.plan-list .selected ul{color:#e1e5f7}.plan-list .selected .button{background:#fff;color:var(--blue);border-color:#fff}
.faq{display:grid;grid-template-columns:.6fr 1.4fr;gap:clamp(40px,8vw,132px);padding:clamp(90px,12vw,180px) clamp(20px,5vw,76px)}.faq>header{align-self:start;position:sticky;top:130px}.faq-list article{border-top:1px solid var(--line)}.faq-list button{width:100%;border:0;background:transparent;padding:24px 44px 24px 0;text-align:left;font-weight:700;cursor:pointer;position:relative}.faq-list button:after{content:"＋";position:absolute;right:0;color:var(--blue)}.faq-list button[aria-expanded=true]:after{content:"−"}.faq-list article>div{display:grid;grid-template-rows:0fr;transition:grid-template-rows .25s}.faq-list article>div p{overflow:hidden;margin:0;color:var(--muted)}.faq-list article.open>div{grid-template-rows:1fr}.faq-list article.open>div p{padding:0 44px 24px 0}
.closing{margin:0 clamp(20px,5vw,76px) clamp(30px,5vw,76px);padding:clamp(48px,7vw,96px);background:var(--blue);color:#fff;border-radius:var(--radius);display:grid;grid-template-columns:1fr auto;gap:24px;align-items:end}.closing .overline{color:#cbd5ff;grid-column:1/-1}.closing>p:not(.overline){margin:0;color:#d9dfff}.closing .button{grid-row:2/4;grid-column:2}.closing.small{margin-top:60px}
.footer{padding:70px clamp(20px,5vw,76px) 30px;display:grid;grid-template-columns:1.5fr repeat(4,1fr);gap:34px;border-top:1px solid var(--line)}.footer h3{font-size:12px;letter-spacing:.12em;margin:0 0 15px}.footer>div:not(.footer-brand){display:flex;flex-direction:column;gap:8px;font-size:13px;color:var(--muted)}.footer-brand p{color:var(--muted);font-size:13px}.fineprint{grid-column:1/-1;border-top:1px solid var(--line);padding-top:20px;color:var(--muted);font-size:11px}.footer.compact{grid-template-columns:2fr 1fr 1fr}
.inner-main{padding:0 clamp(20px,5vw,76px)}.download-intro{display:grid;grid-template-columns:1fr .65fr;gap:clamp(40px,8vw,130px);align-items:end;padding:clamp(70px,10vw,150px) 0}.download-intro>p{color:var(--muted);font-size:16px}.download-intro code{font-weight:700;color:var(--blue)}
.device-directory{display:grid;grid-template-columns:repeat(2,1fr);border-top:1px solid var(--line)}.device-card{display:grid;grid-template-columns:64px 1fr auto;gap:24px;align-items:center;padding:34px 24px;border-bottom:1px solid var(--line)}.device-card:nth-child(odd){border-right:1px solid var(--line)}.device-index{width:42px;height:42px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center;font-size:11px}.device-card span{font-size:10px;letter-spacing:.15em;color:var(--muted)}.device-card h2{margin:0;font-size:30px;letter-spacing:-.04em}.device-card p{margin:5px 0 0;color:var(--muted);font-size:13px}.device-card .button{min-width:142px}
.install-strip{margin:clamp(80px,10vw,150px) 0;display:grid;grid-template-columns:.65fr 1.35fr;gap:70px}.install-strip ol{list-style:none;padding:0;margin:0;counter-reset:item}.install-strip li{counter-increment:item;display:grid;grid-template-columns:44px 150px 1fr;gap:18px;padding:20px 0;border-top:1px solid var(--line)}.install-strip li:before{content:"0" counter(item);color:var(--blue);font-size:11px}.install-strip li span{color:var(--muted)}
.account-note{display:grid;grid-template-columns:1.2fr .8fr;gap:clamp(40px,7vw,100px);align-items:center;margin-bottom:clamp(80px,10vw,150px)}.account-note figure{margin:0}.account-note img{display:block;border-radius:var(--radius)}.account-note>div>p:not(.overline){color:var(--muted)}
.help-shell{display:grid;grid-template-columns:340px 1fr;gap:clamp(50px,9vw,150px);padding:clamp(70px,9vw,140px) clamp(20px,5vw,76px)}.help-index{position:sticky;top:130px;align-self:start}.help-index h1{font-size:56px}.help-index nav{display:grid;grid-template-columns:1fr 1fr;gap:8px 20px;margin-top:40px}.help-index nav a{padding:9px 0;border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}.help-manual section{display:grid;grid-template-columns:70px 1fr;gap:36px;padding:0 0 70px;margin-bottom:70px;border-bottom:1px solid var(--line);scroll-margin-top:110px}.manual-no{color:var(--blue);font-weight:750;font-size:34px}.help-manual h2{font-size:clamp(28px,3.5vw,50px);letter-spacing:-.045em;line-height:1.1;margin:0 0 22px}.help-manual p,.help-manual li{color:var(--muted)}.help-manual li{margin:8px 0}
@media(max-width:980px){.topbar{grid-template-columns:1fr auto}.topbar nav{display:none}.hero{grid-template-columns:1fr;min-height:auto}.hero-copy{max-width:750px}.evidence{grid-template-columns:1fr}.evidence>p{margin:0}.capability-ledger{grid-template-columns:1fr}.capability-ledger>header,.faq>header,.help-index{position:static}.ledger article{grid-template-columns:120px 100px 1fr}.method{grid-template-columns:1fr}.line-note{grid-template-columns:150px 1fr}.voices>header{grid-template-columns:1fr}.plan-list{grid-template-columns:1fr}.plan-list article.selected{transform:none}.faq{grid-template-columns:1fr}.footer{grid-template-columns:repeat(2,1fr)}.footer-brand,.fineprint{grid-column:1/-1}.device-directory{grid-template-columns:1fr}.device-card:nth-child(odd){border-right:0}.help-shell{grid-template-columns:1fr}.help-index nav{grid-template-columns:repeat(4,1fr)}}
@media(max-width:680px){.topbar{height:68px;padding:0 16px}.wordmark small{display:none}.hero{padding:60px 18px;gap:42px}.hero h1,.download-intro h1,.help-index h1{font-size:43px}.platforms{grid-template-columns:1fr}.evidence,.line-note{margin-left:16px;margin-right:16px}.ledger article{grid-template-columns:1fr;gap:8px}.method{padding-left:18px;padding-right:18px}.line-note{grid-template-columns:1fr}.line-note aside{min-height:100px;border-right:0;border-bottom:1px solid #cbd0df;padding:0 0 18px;flex-direction:row;align-items:center}.line-note aside strong{font-size:45px}.voice-row{grid-template-columns:1fr}.voice-row blockquote{min-height:240px}.plans,.faq,.voices,.capability-ledger{padding-left:18px;padding-right:18px}.closing{grid-template-columns:1fr;margin-left:16px;margin-right:16px}.closing .button{grid-column:1;grid-row:auto;justify-self:start}.footer,.footer.compact{grid-template-columns:1fr;padding-left:18px;padding-right:18px}.footer-brand,.fineprint{grid-column:auto}.download-intro{grid-template-columns:1fr}.device-card{grid-template-columns:46px 1fr;padding:25px 0}.device-card .button{grid-column:2;justify-self:start}.install-strip{grid-template-columns:1fr;gap:30px}.install-strip li{grid-template-columns:35px 1fr}.install-strip li span{grid-column:2}.account-note{grid-template-columns:1fr}.help-index nav{grid-template-columns:1fr 1fr}.help-manual section{grid-template-columns:40px 1fr;gap:15px}.manual-no{font-size:24px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.faq-list article>div{transition:none}}

/* Hero media integrity: final, high-specificity coverage rules */
body .hero{align-items:center}
body .hero .hero-media{align-self:center;height:auto;padding:0;margin:0;overflow:visible;transform:none}
body .hero .hero-media picture{display:block;height:auto;padding:0;margin:0}
body .hero .hero-media img{display:block;width:100%;height:auto;object-fit:contain;object-position:center;min-height:0;max-height:none;margin:0;padding:0;clip-path:none;transform:none}