:root{--navy:#14243f;--navy2:#1a2d4d;--teal:#38b9ba;--mint:#5fd4cb;--ink:#122033;--sub:#566476;--line:#e3e9ef;--bg:#f7f9fb;--card:#fff;--r:18px;
font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang HK","PingFang TC","Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;line-height:1.6}
a{color:#15808a;text-decoration:none}a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
/* nav */
.nav{position:sticky;top:0;z-index:10;background:rgba(20,36,63,.82);backdrop-filter:saturate(180%) blur(16px);-webkit-backdrop-filter:saturate(180%) blur(16px);border-bottom:1px solid rgba(255,255,255,.08)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:650;font-size:17px;letter-spacing:-.01em}
.brand img{width:30px;height:30px}.brand:hover{text-decoration:none}
.links{display:flex;align-items:center;gap:22px}
.links a{color:rgba(255,255,255,.78);font-size:14.5px}.links a:hover{color:#fff;text-decoration:none}
.links a.on{color:#fff}
.lang{border:1px solid rgba(255,255,255,.28);border-radius:999px;padding:4px 12px}
/* hero */
.hero{background:radial-gradient(1200px 520px at 50% -10%,#24406b 0%,var(--navy) 55%,#0e1a2e 100%);color:#fff;text-align:center;padding:84px 0 0;overflow:hidden}
.hero .icon{width:104px;height:104px;margin:0 auto 22px;filter:drop-shadow(0 12px 30px rgba(0,0,0,.35))}
.hero h1{font-size:clamp(34px,5.4vw,58px);line-height:1.08;letter-spacing:-.025em;margin:0 0 18px;font-weight:700}
.hero h1 span{background:linear-gradient(90deg,var(--mint),#9ae8e0);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:clamp(17px,2vw,20px);color:rgba(255,255,255,.76);max-width:640px;margin:0 auto 30px}
.cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:14px}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:999px;padding:12px 24px;font-weight:600;font-size:15.5px}
.btn:hover{text-decoration:none}
.btn.primary{background:var(--mint);color:#0d2233}.btn.primary:hover{background:#78e0d8}
.btn.ghost{color:#fff;border:1px solid rgba(255,255,255,.35)}.btn.ghost:hover{background:rgba(255,255,255,.08)}
.note{font-size:13px;color:rgba(255,255,255,.5);margin:0 0 52px}
.shot{max-width:980px;margin:0 auto;border-radius:14px 14px 0 0;overflow:hidden;box-shadow:0 -10px 60px rgba(0,0,0,.45),0 0 0 1px rgba(255,255,255,.1)}
/* sections */
section.block{padding:92px 0}
.eyebrow{color:var(--teal);font-weight:650;font-size:13.5px;letter-spacing:.08em;text-transform:uppercase;margin:0 0 10px}
h2.title{font-size:clamp(28px,3.6vw,40px);line-height:1.15;letter-spacing:-.02em;margin:0 0 14px}
p.intro{color:var(--sub);font-size:18px;max-width:640px;margin:0 0 44px}
.center{text-align:center}.center p.intro{margin-left:auto;margin-right:auto}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:26px}
.card h3{margin:14px 0 6px;font-size:18px;letter-spacing:-.01em}
.card p{margin:0;color:var(--sub);font-size:15px}
.ico{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,#e5f8f6,#d3eff2);color:#177c86}
.ico svg{width:22px;height:22px}
/* split */
.split{display:grid;grid-template-columns:1fr 1.25fr;gap:56px;align-items:center}
.split.rev{grid-template-columns:1.25fr 1fr}.split.rev .txt{order:2}
.split img{border-radius:12px;box-shadow:0 24px 60px rgba(18,32,51,.18),0 0 0 1px rgba(18,32,51,.06)}
.ticks{list-style:none;padding:0;margin:22px 0 0}
.ticks li{position:relative;padding-left:30px;margin:10px 0;color:#2c3a4b}
.ticks li:before{content:"";position:absolute;left:0;top:5px;width:18px;height:18px;border-radius:50%;background:var(--teal) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E") center/12px no-repeat}
.alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
/* pricing */
.plans{display:grid;grid-template-columns:1fr 1fr;gap:22px;max-width:860px;margin:0 auto}
.plan{background:#fff;border:1px solid var(--line);border-radius:22px;padding:32px;text-align:left}
.plan.pro{background:linear-gradient(160deg,var(--navy2),#10203a);color:#fff;border:none;box-shadow:0 26px 60px rgba(20,36,63,.3)}
.plan h3{margin:0;font-size:22px}.plan .tag{font-size:14px;color:var(--sub);margin:6px 0 18px}
.plan.pro .tag{color:rgba(255,255,255,.65)}.plan.pro .ticks li{color:rgba(255,255,255,.88)}
.plan .badge{display:inline-block;font-size:12px;font-weight:650;background:var(--mint);color:#0d2233;border-radius:999px;padding:3px 10px;margin-left:8px;vertical-align:middle}
.small{font-size:13.5px;color:var(--sub);margin-top:22px}
/* intro video: local poster until a press loads the YouTube player */
.player{position:relative;max-width:960px;margin:0 auto;aspect-ratio:16/9;border-radius:18px;overflow:hidden;background:#0e1a2e;box-shadow:0 30px 70px rgba(18,32,51,.22),0 0 0 1px rgba(18,32,51,.06)}
.player button{position:absolute;inset:0;width:100%;height:100%;margin:0;padding:0;border:0;background:none;cursor:pointer}
.player button:disabled{cursor:default}
.player iframe{z-index:1}
.player img,.player iframe{position:absolute;inset:0;width:100%;height:100%;border:0;object-fit:cover}
.player{--pb:84px}
.player .play{position:absolute;left:50%;top:50%;width:var(--pb);height:var(--pb);margin:calc(var(--pb) / -2) 0 0 calc(var(--pb) / -2);border-radius:50%;background:var(--mint);box-shadow:0 12px 34px rgba(0,0,0,.35);transition:transform .2s}
.player .play:after{content:"";position:absolute;left:calc(var(--pb) * .4);top:calc(var(--pb) * .31);border-style:solid;border-width:calc(var(--pb) * .19) 0 calc(var(--pb) * .19) calc(var(--pb) * .31);border-color:transparent transparent transparent #0d2233}
@media(max-width:620px){.player{--pb:56px;border-radius:14px}}
.player button:hover .play{transform:scale(1.06)}
.player button:focus-visible{outline:none}
.player button:focus-visible:after{content:"";position:absolute;inset:0;outline:3px solid var(--mint);outline-offset:-3px;border-radius:inherit}
@media(prefers-color-scheme:dark){.player{box-shadow:0 0 0 1px rgba(255,255,255,.14),0 30px 70px rgba(0,0,0,.35)}}
#video .small{margin-top:18px}
/* faq */
.faq{max-width:780px;margin:0 auto}
details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 22px;margin:12px 0}
summary{cursor:pointer;font-weight:620;list-style:none;display:flex;justify-content:space-between;gap:16px}
summary::-webkit-details-marker{display:none}
summary:after{content:"+";color:var(--teal);font-size:22px;line-height:1}
details[open] summary:after{content:"–"}
details p{color:var(--sub);margin:12px 0 0}
/* cta band */
.band{background:linear-gradient(120deg,#16304f,#1b4a64 60%,#1f6a74);color:#fff;border-radius:26px;padding:56px;text-align:center}
.band h2{margin:0 0 10px;font-size:clamp(26px,3vw,34px);letter-spacing:-.02em}.band p{color:rgba(255,255,255,.75);margin:0 0 26px}
/* doc pages */
.dochead{background:radial-gradient(900px 360px at 50% -20%,#24406b,var(--navy) 70%);color:#fff;padding:64px 0 56px}
.dochead h1{margin:0 0 8px;font-size:clamp(30px,4vw,44px);letter-spacing:-.02em}
.dochead p{margin:0;color:rgba(255,255,255,.7)}
.doc{max-width:780px;margin:0 auto;padding:48px 24px 90px}
.doc h2{font-size:21px;margin:40px 0 10px;letter-spacing:-.01em}
.doc p,.doc li{color:#2c3a4b}.doc ul{padding-left:22px}.doc li{margin:8px 0}
.contact{display:flex;align-items:center;gap:18px;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px 24px;margin:8px 0 12px}
.contact .ico{flex:none}.contact strong{display:block}.contact span{color:var(--sub);font-size:14.5px}
.kbd{display:grid;grid-template-columns:auto 1fr;gap:8px 18px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 22px}
kbd{font-family:ui-monospace,Menlo,monospace;font-size:13px;background:#f1f4f7;border:1px solid #d9e1e8;border-bottom-width:2px;border-radius:6px;padding:2px 8px;white-space:nowrap}
/* footer */
footer{background:#0e1a2e;color:rgba(255,255,255,.6);font-size:14px;padding:44px 0}
footer .wrap{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap}
footer a{color:rgba(255,255,255,.75)}footer .fl{display:flex;gap:20px;flex-wrap:wrap}
footer .disc{flex-basis:100%;font-size:12.5px;color:rgba(255,255,255,.4);margin:0}
.nf{min-height:60vh;display:grid;place-items:center;text-align:center}
@media(max-width:900px){.grid{grid-template-columns:1fr 1fr}.split,.split.rev{grid-template-columns:1fr;gap:32px}.split.rev .txt{order:0}.plans{grid-template-columns:1fr}}
@media(max-width:620px){.grid{grid-template-columns:1fr}.links a.hide{display:none}.links{gap:14px}section.block{padding:64px 0}.band{padding:40px 24px}.hero{padding-top:60px}}
@media(prefers-color-scheme:dark){:root{--ink:#e8eef4;--sub:#9fb0c1;--line:#233249;--bg:#0f1a2b;--card:#15233a}
.alt{background:#122036}.plan,details,.contact,.kbd{background:var(--card)}.card{background:var(--card)}
.ticks li,.doc p,.doc li{color:#cfdae5}kbd{background:#1b2c47;border-color:#2c3f5e;color:#e8eef4}
.ico{background:linear-gradient(135deg,#1c3b4a,#18344a);color:var(--mint)}a{color:var(--mint)}}
/* Language navigation keeps the current document when switching locale. */
.nav .language-menu{position:relative;margin:0;padding:0;border:0;background:transparent;font-size:14px}
.nav .language-menu summary{padding:8px 12px;border:1px solid #ffffff47;border-radius:8px;white-space:nowrap;font-size:14px;font-weight:600;color:#fff}
.nav .language-menu summary::after{content:" ▾";position:static;margin-left:4px}
.nav .language-menu[open] summary::after{content:" ▴"}
.nav .language-menu>div{position:absolute;right:0;top:calc(100% + 8px);display:grid;width:340px;max-width:calc(100vw - 48px);grid-template-columns:repeat(2,minmax(0,1fr));gap:4px;padding:10px;background:var(--card);border:1px solid var(--line);border-radius:12px;box-shadow:0 12px 36px #0003;max-height:70vh;overflow:auto;z-index:50}
.nav .language-menu a{display:block;padding:9px 10px;border-radius:6px;white-space:normal;overflow-wrap:anywhere;color:var(--ink)}
.nav .language-menu a:hover,.nav .language-menu a[aria-current=page]{background:var(--bg);color:var(--ink)}
.nav a:focus-visible,.nav summary:focus-visible{outline:2px solid var(--mint);outline-offset:3px}
@media(max-width:900px){.nav .links a.hide{display:none}}
@media(max-width:620px){.nav .wrap{height:auto;min-height:70px;padding-top:12px;padding-bottom:12px;flex-wrap:wrap;gap:10px}.nav .links{margin-left:auto;flex-wrap:wrap;justify-content:flex-end}}