:root{--bg:#fbfbf8;--ink:#0a1233;--muted:#525a78;--blue:#2547ff;--blue-d:#1a34c4;--mint:#00c896;--soft:#eef0f9;--line:#d8dbe8;--navy:#0a1233;--warn:#ff6b3d}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'IBM Plex Sans',system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.65;font-size:17px;overflow-x:hidden;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:'Sora',system-ui,sans-serif;font-weight:700;line-height:1.1;letter-spacing:-.03em}
a{color:inherit}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
.mono{font-family:'IBM Plex Mono',monospace}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px 14px;z-index:99;border:1px solid var(--ink)}

/* header */
header.site{position:sticky;top:0;z-index:50;background:rgba(251,251,248,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{font:800 1.5rem 'Sora';text-decoration:none;letter-spacing:-.05em;display:flex;align-items:center;gap:10px}
.logo svg{width:34px;height:34px;flex:none}
.logo b{color:var(--blue);font-weight:800}
nav.main ul{display:flex;gap:2px;list-style:none}
nav.main a{display:block;text-decoration:none;font-weight:500;font-size:.96rem;padding:8px 14px;color:var(--muted);border-radius:6px;transition:.2s}
nav.main a:hover{color:var(--ink);background:var(--soft)}
nav.main a.on{color:var(--blue);background:var(--soft)}
.burger{display:none;width:44px;height:42px;background:none;border:1px solid var(--line);border-radius:6px;font-size:1.3rem;cursor:pointer}
.btn{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font:600 1rem 'IBM Plex Sans';padding:13px 24px;background:var(--blue);color:#fff;border:0;border-radius:6px;cursor:pointer;transition:transform .2s,background .2s}
.btn:hover{background:var(--blue-d);transform:translateY(-2px)}
.btn.ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.btn.ghost:hover{background:var(--ink);color:#fff}
.btn.white{background:#fff;color:var(--navy)}.btn.white:hover{background:var(--mint);color:var(--navy)}

/* hero */
.hero{padding:72px 0 80px;border-bottom:1px solid var(--line);position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(40% 50% at 85% 20%,rgba(37,71,255,.1),transparent 70%),radial-gradient(30% 40% at 10% 90%,rgba(0,200,150,.1),transparent 70%)}
.hero-grid{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:60px;align-items:center}
.eyebrow{font:500 .8rem 'IBM Plex Mono';letter-spacing:.14em;text-transform:uppercase;color:var(--blue);display:flex;align-items:center;gap:10px;margin-bottom:20px}
.eyebrow::before{content:"";width:28px;height:2px;background:var(--blue)}
h1{font-size:clamp(2.8rem,6.6vw,5.6rem)}
h1 em{font-style:normal;color:var(--blue)}
.lead{font-size:1.22rem;color:var(--muted);max-width:560px;margin:24px 0 34px}
.cta{display:flex;gap:14px;flex-wrap:wrap}
.wave-card{background:var(--navy);border-radius:14px;padding:26px;color:#fff;box-shadow:0 30px 60px -30px rgba(10,18,51,.6)}
.wave-top{display:flex;justify-content:space-between;font:500 .78rem 'IBM Plex Mono';color:var(--mint);letter-spacing:.08em;margin-bottom:16px}
.wave-card svg{width:100%;height:150px;display:block}
.wave-card path{fill:none;stroke-linecap:round;stroke-width:3}
.w1{stroke:var(--mint);stroke-dasharray:900;animation:draw 5s linear infinite}
.w2{stroke:var(--blue);opacity:.9;stroke-dasharray:900;animation:draw 7s linear infinite reverse}
@keyframes draw{from{stroke-dashoffset:0}to{stroke-dashoffset:1800}}
.keys{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:20px}
.keys span{background:#16204a;border-radius:8px;text-align:center;padding:12px 0;font:600 1.2rem 'Sora';transition:.2s}
.keys span:hover{background:var(--blue)}
.keys small{display:block;font:500 .6rem 'IBM Plex Mono';color:#8e99c9;letter-spacing:.14em}
.stats-row{display:flex;gap:30px;margin-top:20px;font:500 .8rem 'IBM Plex Mono';color:#9aa5d6}
.stats-row b{display:block;font:700 1.3rem 'Sora';color:#fff}

/* sections */
section{padding:84px 0}
section.soft{background:var(--soft);border-block:1px solid var(--line)}
section.navy{background:var(--navy);color:#fff}
.head{margin-bottom:44px;max-width:720px}
.head h2{font-size:clamp(2rem,4.2vw,3.2rem)}
.head p{color:var(--muted);margin-top:14px;font-size:1.12rem}
.navy .head p{color:#a9b3dd}
.idx{font:500 .85rem 'IBM Plex Mono';color:var(--blue);display:block;margin-bottom:12px;letter-spacing:.1em}
.navy .idx{color:var(--mint)}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.card{display:block;text-decoration:none;background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden;transition:transform .25s,border-color .25s,box-shadow .25s}
a.card:hover{transform:translateY(-6px);border-color:var(--blue);box-shadow:0 24px 40px -24px rgba(37,71,255,.5)}
.card .img{aspect-ratio:3/2;overflow:hidden;border-bottom:1px solid var(--line)}.card .img img{width:100%;height:100%;object-fit:cover}
.card .body{padding:22px}.card h3{font-size:1.35rem;margin:8px 0}.card p{color:var(--muted);font-size:.98rem}
.pad{padding:30px}
.meta{font:500 .74rem 'IBM Plex Mono';letter-spacing:.1em;text-transform:uppercase;color:var(--blue)}
.step{border-top:2px solid var(--ink);padding-top:18px}.navy .step{border-color:var(--mint)}
.step .n{font:700 .9rem 'IBM Plex Mono';color:var(--blue)}.navy .step .n{color:var(--mint)}
.step h3{font-size:1.4rem;margin:10px 0 8px}.step p{color:var(--muted);font-size:.98rem}.navy .step p{color:#a9b3dd}
.tool-card{display:grid;grid-template-columns:auto 1fr;gap:22px;align-items:start}
.tool-ico{width:64px;height:64px;border-radius:12px;background:var(--blue);display:grid;place-items:center;color:#fff;font:700 1.6rem 'Sora'}
.tool-ico.m{background:var(--mint);color:var(--navy)}

/* page header */
.pagehead{padding:64px 0 52px;border-bottom:1px solid var(--line);background:var(--soft)}
.pagehead-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:50px;align-items:center}
.pagehead h1{font-size:clamp(2.4rem,5vw,4.2rem)}
.pagehead .art{border:1px solid var(--line);border-radius:12px;overflow:hidden;aspect-ratio:3/2;background:#fff}.pagehead .art img{width:100%;height:100%;object-fit:cover}
.crumbs{font:500 .8rem 'IBM Plex Mono';color:var(--muted);margin-bottom:16px}.crumbs a{text-decoration:none}.crumbs a:hover{color:var(--blue)}
.article{display:grid;grid-template-columns:240px 1fr;gap:56px;align-items:start}.article>*{min-width:0}
.toc{position:sticky;top:92px;border-left:3px solid var(--blue);padding:4px 0 4px 20px;font-size:.93rem}
.toc b{font:600 .72rem 'IBM Plex Mono';letter-spacing:.14em;text-transform:uppercase;color:var(--blue)}
.toc ul{list-style:none;display:grid;gap:9px;margin-top:12px}.toc a{text-decoration:none;color:var(--muted)}.toc a:hover{color:var(--ink)}
.prose{max-width:740px}.prose p{margin-bottom:20px;font-size:1.1rem;color:#262d4c}
.prose h2{font-size:2rem;margin:46px 0 14px}.prose ul,.prose ol{margin:0 0 22px 24px;font-size:1.08rem;color:#262d4c}.prose li{margin-bottom:8px}
.prose a{color:var(--blue);text-underline-offset:3px}
.callout{background:var(--soft);border-left:4px solid var(--blue);padding:20px 24px;margin:26px 0;border-radius:0 8px 8px 0}
.callout b{display:block;font:600 .72rem 'IBM Plex Mono';letter-spacing:.14em;text-transform:uppercase;color:var(--blue);margin-bottom:4px}
.tw{overflow-x:auto;margin:24px 0}
table{width:100%;border-collapse:collapse;background:#fff;font-size:.98rem}
th,td{padding:12px 14px;text-align:left;border:1px solid var(--line)}th{background:var(--navy);color:#fff;font:600 .78rem 'IBM Plex Mono';letter-spacing:.06em;text-transform:uppercase}

/* tools */
.tool-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:30px;align-items:start}
.panel{background:#fff;border:1px solid var(--line);border-radius:12px;padding:30px}
label{display:block;font:600 .78rem 'IBM Plex Mono';letter-spacing:.08em;text-transform:uppercase;margin:18px 0 6px;color:var(--muted)}label:first-child{margin-top:0}
input,select{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:6px;background:var(--bg);font:500 1.02rem 'IBM Plex Sans';color:var(--ink)}
input:focus,select:focus{outline:2px solid var(--blue);outline-offset:1px}
input[type=range]{padding:0;border:0;background:none;accent-color:var(--blue);height:32px}
.seg{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);border-radius:8px;overflow:hidden;margin-bottom:6px}
.seg button{padding:12px;background:#fff;border:0;font:600 .95rem 'IBM Plex Sans';cursor:pointer;color:var(--muted)}.seg button.on{background:var(--blue);color:#fff}
.out{background:var(--navy);color:#fff;border-radius:12px;padding:30px}
.out .big{font:800 clamp(3rem,7vw,4.6rem) 'Sora';letter-spacing:-.05em;color:var(--mint);line-height:1}
.out .big small{font:500 1.1rem 'IBM Plex Mono';color:#9aa5d6;margin-left:8px;letter-spacing:0}
.out dl{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:24px}
.out dt{font:500 .7rem 'IBM Plex Mono';letter-spacing:.1em;text-transform:uppercase;color:#8e99c9}.out dd{font:700 1.3rem 'Sora'}
.bars{display:flex;align-items:flex-end;gap:5px;height:70px;margin-top:22px}.bars i{flex:1;background:var(--blue);border-radius:2px 2px 0 0;min-height:4px}.bars i.m{background:var(--mint)}
.note{font-size:.9rem;color:#9aa5d6;margin-top:16px}.hide{display:none}
.warn{margin-top:14px;padding:10px 14px;border:1px solid var(--warn);color:#ffb59d;border-radius:6px;font-size:.92rem;display:none}

details{background:#fff;border:1px solid var(--line);border-radius:10px;margin-bottom:12px}
summary{cursor:pointer;padding:18px 22px;font:600 1.1rem 'Sora';list-style:none;display:flex;justify-content:space-between;gap:16px}
summary::after{content:"+";color:var(--blue);font-size:1.5rem;line-height:1}details[open] summary::after{content:"–"}
details p{padding:0 22px 20px;color:var(--muted)}

.band{background:var(--blue);color:#fff;padding:72px 0;text-align:center}
.band h2{font-size:clamp(2rem,4.6vw,3.4rem);max-width:760px;margin:0 auto 22px}
.band p{max-width:560px;margin:0 auto 28px;color:#dfe5ff}
footer.site{background:var(--navy);color:#fff;padding:64px 0 30px}
.foot{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px}
.foot p{color:#9aa5d6;margin-top:14px;max-width:340px;font-size:.96rem}
.foot h4{font:500 .75rem 'IBM Plex Mono';letter-spacing:.14em;text-transform:uppercase;color:var(--mint);margin-bottom:14px}
.foot ul{list-style:none;display:grid;gap:8px}.foot a{text-decoration:none;color:#d3d9f3}.foot a:hover{color:var(--mint)}
.copy{border-top:1px solid #1f2a5c;margin-top:40px;padding-top:22px;color:#7f8ab9;font-size:.86rem}
.rv{opacity:0;transform:translateY(24px);transition:opacity .7s,transform .7s}.rv.in{opacity:1;transform:none}

@media(max-width:960px){
  .burger{display:block}
  nav.main{position:absolute;top:68px;left:0;right:0;background:var(--bg);border-bottom:1px solid var(--line);display:none;padding:10px 24px 18px}
  nav.main.open{display:block}nav.main ul{flex-direction:column}
  .hero-grid,.pagehead-grid,.tool-grid,.article,.grid2{grid-template-columns:1fr}
  .grid3{grid-template-columns:1fr}.grid4{grid-template-columns:repeat(2,1fr)}
  .toc{position:static}.foot{grid-template-columns:1fr 1fr}section{padding:60px 0}.hero{padding:48px 0 56px}
}
@media(max-width:520px){.grid4,.foot,.out dl{grid-template-columns:1fr}.panel,.out{padding:22px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.rv{opacity:1;transform:none}}

.hero-grid>*,.pagehead-grid>*,.tool-grid>*,.grid2>*,.grid3>*,.grid4>*{min-width:0}
.stats-row{flex-wrap:wrap;gap:14px 26px}
.logo span{display:inline}
.eyebrow{flex-wrap:wrap}