:root{
  --bg:#0e141c;--bg-2:#121a24;--panel:#171f29;--panel-2:#1b2531;--line:#263241;--line-2:#33414f;
  --text:#dbe4ee;--text-2:#a9b8c8;--muted:#7d8ea2;--accent:#5bd6cd;--accent-2:#8be7e0;--accent-ink:#0a3336;
  --blue:#4f8bb8;--orange:#ff8a4c;--radius:14px;--max:1160px;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:"Pretendard","Segoe UI","Malgun Gothic","Apple SD Gothic Neo",system-ui,sans-serif;font-size:16px;line-height:1.7;word-break:keep-all;overflow-wrap:break-word;overflow-x:hidden}
:lang(ja) body,body:lang(ja),:lang(zh-CN) body,body:lang(zh-CN),:lang(zh-TW) body,body:lang(zh-TW){word-break:normal;line-break:strict}
html:lang(ja) body{font-family:"Segoe UI","Yu Gothic UI","Meiryo","Hiragino Sans",system-ui,sans-serif}
html:lang(zh-CN) body{font-family:"Segoe UI","Microsoft YaHei","PingFang SC",system-ui,sans-serif}
html:lang(zh-TW) body{font-family:"Segoe UI","Microsoft JhengHei","PingFang TC",system-ui,sans-serif}
.section-head h2,.feature-text h3,.hero h1{hyphens:auto;-webkit-hyphens:auto}
img{max-width:100%;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-2)}
h1,h2,h3,p{margin:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.wrap{width:100%;max-width:var(--max);margin:0 auto;padding:0 24px}
.eyebrow{font:600 12px/1 Consolas,"SFMono-Regular",monospace;letter-spacing:.18em;color:var(--accent);text-transform:uppercase}
.mono{font-family:Consolas,"SFMono-Regular",monospace}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(14,20,28,.82);backdrop-filter:saturate(1.4) blur(12px);-webkit-backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid transparent;transition:border-color .2s}
.nav.scrolled{border-color:var(--line)}
.nav .wrap{display:flex;align-items:center;gap:28px;height:68px}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:700;font-size:20px;letter-spacing:.06em}
.brand:hover{color:var(--text)}
.brand img{width:34px;height:34px}
.brand small{display:block;font-size:9px;letter-spacing:.24em;color:var(--muted);font-weight:500;margin-top:-2px}
.nav-links{display:flex;gap:24px;margin-left:auto;font-size:14px}
.nav-links a{color:var(--text-2)}
.nav-links a:hover{color:var(--text)}
.lang{appearance:none;-webkit-appearance:none;background:transparent url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%237d8ea2' stroke-width='1.5'/%3E%3C/svg%3E") no-repeat right 11px center/9px 6px;border:1px solid var(--line-2);color:var(--text-2);border-radius:999px;font:600 13px/1.2 inherit;padding:8px 28px 8px 12px;cursor:pointer;max-width:130px}
.lang option{background:var(--panel);color:var(--text)}
.lang:hover{border-color:var(--accent);color:var(--text)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:0 22px;border-radius:10px;font-weight:650;font-size:15px;border:1px solid transparent;transition:background .15s,border-color .15s,transform .15s;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--accent);color:var(--accent-ink);border-color:#79e2da}
.btn-primary:hover{background:var(--accent-2);color:var(--accent-ink)}
.btn-ghost{background:#1a2632;color:var(--text);border-color:var(--line-2)}
.btn-ghost:hover{border-color:#5d7387;color:var(--text);background:#213040}
.btn svg{width:18px;height:18px;flex:none}
.btn-sm{min-height:38px;padding:0 14px;font-size:14px}

/* hero */
.hero{position:relative;padding:84px 0 40px;overflow:hidden}
.hero:before{content:"";position:absolute;inset:-20% -10% auto;height:760px;background:radial-gradient(ellipse at 50% 30%,rgba(91,214,205,.16),transparent 60%),radial-gradient(ellipse at 80% 10%,rgba(79,139,184,.18),transparent 55%);pointer-events:none}
.hero:after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:48px 48px;mask-image:radial-gradient(ellipse at 50% 20%,#000 20%,transparent 70%);-webkit-mask-image:radial-gradient(ellipse at 50% 20%,#000 20%,transparent 70%);pointer-events:none}
.hero .wrap{position:relative;z-index:1;text-align:center}
.hero h1{font-size:clamp(34px,6vw,64px);line-height:1.18;letter-spacing:-.03em;font-weight:750;margin:22px auto 0;max-width:15em}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,var(--accent),#7fb8ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{font-size:clamp(16px,2vw,19px);color:var(--text-2);max-width:40em;margin:22px auto 0}
.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:34px}
.hero-meta{display:flex;gap:8px 22px;justify-content:center;flex-wrap:wrap;margin-top:22px;font-size:13px;color:var(--muted)}
.hero-meta span{display:inline-flex;align-items:center;gap:8px}
.hero-meta i{width:6px;height:6px;border-radius:50%;background:var(--accent);display:inline-block}
.pill{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line-2);background:rgba(23,31,41,.7);border-radius:999px;padding:6px 14px 6px 8px;font-size:13px;color:var(--text-2)}
.pill b{background:var(--accent);color:var(--accent-ink);border-radius:999px;padding:2px 8px;font-size:11px;font-weight:700}

/* window frame */
.window{margin:56px auto 0;max-width:1080px;border:1px solid var(--line-2);border-radius:14px;overflow:hidden;background:var(--panel);box-shadow:0 40px 120px rgba(0,0,0,.55),0 0 0 1px rgba(255,255,255,.02) inset}
.window-bar{display:flex;align-items:center;gap:8px;height:34px;padding:0 14px;background:#141c25;border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}
.window-bar .dots{display:flex;gap:6px;margin-right:6px}
.window-bar .dots i{width:10px;height:10px;border-radius:50%;background:#2c3946}
.window-bar .title{margin:0 auto;transform:translateX(-30px)}
.window img{width:100%;height:auto;aspect-ratio:1524/915}

/* trust strip */
.strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--bg-2);margin-top:72px}
.strip .wrap{display:grid;grid-template-columns:repeat(4,1fr)}
.strip div{padding:26px 20px;border-left:1px solid var(--line)}
.strip div:first-child{border-left:0}
.strip strong{display:block;font-size:22px;font-weight:700;letter-spacing:-.01em}
.strip span{font-size:14px;color:var(--muted)}

/* sections */
section{scroll-margin-top:80px}
.section{padding:110px 0}
.section-head{max-width:720px;margin-bottom:56px}
.section-head.center{text-align:center;margin-left:auto;margin-right:auto}
.section-head h2{font-size:clamp(28px,4vw,42px);line-height:1.25;letter-spacing:-.025em;font-weight:720;margin-top:14px}
.section-head p{color:var(--text-2);margin-top:16px;font-size:17px}

.feature{display:grid;grid-template-columns:5fr 7fr;gap:56px;align-items:center;padding:44px 0}
.feature + .feature{border-top:1px solid var(--line)}
.feature.flip{grid-template-columns:7fr 5fr}
.feature.flip .feature-text{order:2}
.feature-text h3{font-size:26px;letter-spacing:-.02em;line-height:1.35;font-weight:700;margin-top:12px}
.feature-text p{color:var(--text-2);margin-top:14px}
.feature-text ul{list-style:none;padding:0;margin:20px 0 0;display:grid;gap:10px}
.feature-text li{position:relative;padding-left:26px;color:var(--text-2);font-size:15px}
.feature-text li:before{content:"";position:absolute;left:2px;top:.62em;width:12px;height:7px;border-left:2px solid var(--accent);border-bottom:2px solid var(--accent);transform:rotate(-45deg)}
.kbd{display:inline-block;border:1px solid #4a5e70;background:#1d2b39;border-radius:5px;padding:0 7px;font:12px/22px Consolas,monospace;color:#bcd2e2;margin:0 2px}
.shot{border:1px solid var(--line-2);border-radius:12px;overflow:hidden;background:var(--panel);box-shadow:0 24px 70px rgba(0,0,0,.45);cursor:zoom-in;padding:0;display:block;width:100%;transition:transform .25s,border-color .25s}
.shot:hover{transform:translateY(-3px);border-color:#4a6074}
.shot img{width:100%;height:auto;aspect-ratio:1524/915}

/* grid of small features */
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:24px 22px}
.card svg{width:26px;height:26px;color:var(--accent)}
.card h3{font-size:16px;margin-top:16px;font-weight:650}
.card p{font-size:14px;color:var(--muted);margin-top:8px;line-height:1.65}

/* formats */
.formats{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.fmt{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px;display:flex;flex-direction:column;gap:10px}
.fmt-head{display:flex;align-items:center;justify-content:space-between;gap:10px}
.fmt-head strong{font-size:18px}
.fmt-ext{display:flex;gap:6px;flex-wrap:wrap}
.fmt-ext code{font:12px/1 Consolas,monospace;color:var(--accent);background:#14343a;border-radius:5px;padding:5px 7px}
.fmt p{font-size:14px;color:var(--muted);line-height:1.65}
.tag{font-size:11px;font-weight:700;letter-spacing:.06em;padding:3px 8px;border-radius:999px;border:1px solid var(--line-2);color:var(--text-2)}
.tag.d3{border-color:#2e6a6f;color:var(--accent)}
.tag.d2{border-color:#6a5531;color:#e3b56e}
.note{margin-top:26px;padding:18px 20px;border-left:3px solid var(--accent);background:var(--bg-2);border-radius:0 10px 10px 0;color:var(--text-2);font-size:15px}

/* fit */
.fit{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.fit .card h3{margin-top:0;font-size:18px;display:flex;align-items:center;gap:10px}
.fit ul{margin:16px 0 0;padding-left:20px;color:var(--text-2);font-size:15px;display:grid;gap:8px}
.fit .no h3{color:#f0b3a6}

/* download */
.download{position:relative;overflow:hidden;border:1px solid var(--line-2);border-radius:22px;background:linear-gradient(135deg,#132331,#0f1a24 60%);padding:64px 56px;display:grid;grid-template-columns:auto 1fr;gap:44px;align-items:center}
.download:before{content:"";position:absolute;right:-120px;top:-160px;width:520px;height:520px;background:radial-gradient(circle,rgba(91,214,205,.18),transparent 65%)}
.download img{width:150px;height:150px;border-radius:32px;position:relative}
.download h2{font-size:clamp(26px,3.6vw,38px);letter-spacing:-.02em;line-height:1.25;position:relative}
.download p{color:var(--text-2);margin-top:12px;position:relative}
.download .hero-cta{justify-content:flex-start;margin-top:26px;position:relative}
.req{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:28px;position:relative}
.req div{font-size:13px;color:var(--muted);border-top:1px solid var(--line-2);padding-top:12px}
.req b{display:block;color:var(--text);font-size:14px;font-weight:600}

/* faq */
.faq{max-width:820px;margin:0 auto;display:grid;gap:10px}
.faq details{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:0 22px}
.faq details[open]{border-color:var(--line-2)}
.faq summary{cursor:pointer;list-style:none;padding:20px 30px 20px 0;font-weight:600;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";position:absolute;right:0;top:16px;font-size:22px;color:var(--muted);font-weight:400;transition:transform .2s}
.faq details[open] summary:after{transform:rotate(45deg)}
.faq details p{color:var(--text-2);padding-bottom:20px;font-size:15px}

/* footer */
footer{border-top:1px solid var(--line);padding:44px 0 56px;color:var(--muted);font-size:14px;margin-top:40px}
footer .wrap{display:flex;gap:24px;align-items:flex-start;justify-content:space-between;flex-wrap:wrap}
footer nav{display:flex;gap:20px;flex-wrap:wrap}
footer nav a{color:var(--text-2)}
footer small{display:block;margin-top:8px;font-size:12px;max-width:520px;line-height:1.6}

/* lightbox */
.lightbox{border:0;padding:0;background:transparent;max-width:min(1500px,96vw);max-height:94vh;overflow:visible}
.lightbox::backdrop{background:rgba(5,9,14,.88);backdrop-filter:blur(4px)}
.lightbox img{max-height:86vh;width:auto;border-radius:10px;border:1px solid var(--line-2)}
.lightbox p{color:var(--text-2);text-align:center;margin-top:12px;font-size:14px}
.lightbox button{position:absolute;top:-14px;right:-14px;width:36px;height:36px;border-radius:50%;border:1px solid var(--line-2);background:var(--panel-2);color:var(--text);font-size:20px;cursor:pointer}

/* reveal */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* legal pages */
.legal{max-width:780px;margin:0 auto;padding:72px 24px 40px}
.legal h1{font-size:clamp(28px,4vw,40px);letter-spacing:-.02em;line-height:1.3;margin-top:14px}
.legal .date{color:var(--muted);margin-top:10px;font-size:14px}
.legal h2{font-size:20px;margin-top:40px}
.legal p,.legal li{color:var(--text-2)}
.legal p{margin-top:14px}
.legal ol,.legal ul{padding-left:22px;display:grid;gap:10px;margin-top:14px}
.legal .callout{margin-top:28px;padding:18px 20px;border:1px solid var(--line-2);border-radius:12px;background:var(--panel)}

@media (max-width:960px){
  .feature,.feature.flip{grid-template-columns:1fr;gap:28px}
  .feature.flip .feature-text{order:0}
  .grid{grid-template-columns:repeat(2,1fr)}
  .strip .wrap{grid-template-columns:repeat(2,1fr)}
  .strip div:nth-child(3){border-left:0}
  .strip div:nth-child(n+3){border-top:1px solid var(--line)}
  .download{grid-template-columns:1fr;padding:44px 28px;gap:24px}
  .download img{width:96px;height:96px;border-radius:22px}
  .nav-links a:not(.keep){display:none}
}
@media (max-width:640px){
  .wrap{padding:0 16px}
  .hero{padding-top:56px}
  .section{padding:76px 0}
  .grid,.fit,.req{grid-template-columns:1fr}
  .window{margin-top:40px;border-radius:10px}
  .window-bar{height:26px}
  .window-bar .title{display:none}
  .strip div{padding:20px 14px}
  .strip strong{font-size:18px}
  .nav .wrap{gap:12px}
  .nav-links{gap:12px}
  .brand small{display:none}
  .btn{width:100%}
  .hero-cta .btn{width:100%}
  .nav .btn{width:auto}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .shot,.btn{transition:none}
}