/* getaiapikey.com - night hydrographic chart */
:root{
  --bg:#06130f;--tx:#e2f2ec;--mu:#a3c2b7;--ac:#45e0b4;--amb:#ffb347;--ink:#062019;--paper:#e3f3ec;
  --ln:rgba(69,224,180,.16);--ln2:rgba(69,224,180,.38);--plate:#04100c;
  --serif:"DM Serif Display",Georgia,"Times New Roman",serif;
  --sans:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"Ubuntu Sans Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --contour:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1400 800'%3E%3Cdefs%3E%3Cpath id='b' d='M100,0C100,45 70,85 20,95C-30,105-75,80-95,35C-112,-5-90,-60-50,-85C-10,-108 45,-100 75,-70C92,-50 100,-25 100,0Z'/%3E%3C/defs%3E%3Cg fill='none' stroke='%2345e0b4' stroke-opacity='.17'%3E%3Cuse href='%23b' transform='translate(900 330) scale(.4)' stroke-width='2.5'/%3E%3Cuse href='%23b' transform='translate(904 332) rotate(4) scale(.85)' stroke-width='1.2'/%3E%3Cuse href='%23b' transform='translate(910 336) rotate(8) scale(1.35)' stroke-width='.75'/%3E%3Cuse href='%23b' transform='translate(916 340) rotate(11) scale(1.95)' stroke-width='1.1'/%3E%3Cuse href='%23b' transform='translate(924 346) rotate(14) scale(2.65)' stroke-width='.38'/%3E%3Cuse href='%23b' transform='translate(932 352) rotate(16) scale(3.45)' stroke-width='.29'/%3E%3Cuse href='%23b' transform='translate(942 360) rotate(19) scale(4.4)' stroke-width='.5'/%3E%3Cuse href='%23b' transform='translate(952 368) rotate(21) scale(5.5)' stroke-width='.18'/%3E%3Cuse href='%23b' transform='translate(962 376) rotate(23) scale(6.8)' stroke-width='.15'/%3E%3Cuse href='%23b' transform='translate(972 384) rotate(25) scale(8.3)' stroke-width='.26'/%3E%3Cuse href='%23b' transform='translate(120 700) rotate(200) scale(.5)' stroke-width='2'/%3E%3Cuse href='%23b' transform='translate(124 696) rotate(206) scale(1.05)' stroke-width='.95'/%3E%3Cuse href='%23b' transform='translate(130 690) rotate(212) scale(1.7)' stroke-width='1.2'/%3E%3Cuse href='%23b' transform='translate(138 684) rotate(217) scale(2.45)' stroke-width='.4'/%3E%3C/g%3E%3C/svg%3E");
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:96px}
body{margin:0;background:var(--bg);color:var(--tx);font:400 16px/1.65 var(--sans);-webkit-font-smoothing:antialiased;overflow-wrap:break-word}
[hidden]{display:none!important}
img,svg{max-width:100%}
a{color:var(--ac)}
h1,h2,h3,p,ul,ol,dl,dd{margin:0}
ul,ol{padding:0}
h1,h2{font-family:var(--serif);font-weight:400;letter-spacing:-.005em;line-height:1.08}
h3{font:600 1.06rem/1.35 var(--sans)}
:focus-visible{outline:2px solid var(--amb);outline-offset:3px}
.paper :focus-visible,.form :focus-visible{outline-color:#062019}
.wrap{max-width:1216px;margin:0 auto;padding:0 28px}
.skip{position:absolute;left:-999px;top:0;z-index:100;background:var(--ac);color:var(--ink);padding:12px 18px;font-weight:600}
.skip:focus{left:12px;top:12px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:0 22px;border:0;border-radius:2px;background:var(--ac);color:#04130e;font:600 .98rem/1.2 var(--sans);text-decoration:none;cursor:pointer;box-shadow:0 0 0 3px var(--bg),0 0 0 4px var(--ac);transition:background .15s,transform .15s}
.btn:hover{background:#7cf0cf}
.btn:active{transform:translateY(1px)}
.btn.ghost{background:transparent;color:var(--tx);box-shadow:inset 0 0 0 1px var(--ln2)}
.btn.ghost:hover{background:rgba(69,224,180,.1)}
.btn.sm{min-height:44px;padding:0 14px;font-size:.88rem}
.kg{width:22px;height:22px;flex:none;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}
.xh{width:18px;height:18px;flex:none;fill:none;stroke:var(--ac);stroke-width:1.5}
.acts-row{display:flex;flex-wrap:wrap;gap:18px;margin-top:30px}

/* ---------- header ---------- */
.top{position:sticky;top:0;z-index:50;background:rgba(6,19,15,.95);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.top-in{display:flex;align-items:center;gap:10px;height:68px;position:relative}
.logo{display:inline-flex;align-items:center;gap:10px;min-height:44px;color:var(--tx);text-decoration:none;font:400 1.36rem/1 var(--serif);letter-spacing:.01em}
.mark{width:34px;height:34px;flex:none}
.mark circle{fill:none;stroke:var(--ac);stroke-width:1;stroke-dasharray:1.3 2.23}
.mark .m1{fill:var(--bg);stroke:var(--ac);stroke-width:1.3;stroke-linejoin:round}
.mark .m2{fill:var(--amb)}
.nav{margin-left:auto;display:flex;align-items:center;gap:2px}
.nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 14px;color:var(--mu);text-decoration:none;font:400 .84rem/1 var(--mono);letter-spacing:.09em;text-transform:uppercase;position:relative}
.nav a:hover{color:var(--tx)}
.nav a[aria-current]{color:var(--tx)}
.nav a[aria-current]::after{content:"";position:absolute;left:50%;bottom:2px;width:7px;height:7px;margin-left:-3.5px;background:var(--ac);transform:rotate(45deg)}
.hbtn{margin-left:16px;min-height:44px;padding:0 18px}
.burger{display:none;width:44px;height:44px;padding:0;border:1px solid var(--ln2);border-radius:2px;background:transparent;cursor:pointer;place-content:center;gap:5px}
.burger i{display:block;width:20px;height:2px;background:var(--tx)}
.scale{height:7px;border-top:1px solid var(--ac);border-bottom:1px solid var(--ac);background:repeating-linear-gradient(90deg,var(--ac) 0 56px,transparent 56px 112px);opacity:.85}

/* ---------- bands = depth zones ---------- */
.band{position:relative;padding:92px 0;background-color:var(--bg);border-top:1px solid var(--ln);overflow:hidden;overflow:clip}
.d1{--bg:#0d2a22}.d2{--bg:#0a221c}.d3{--bg:#081b16}.d4{--bg:#071611}.d5{--bg:#06130f}
.bh{display:flex;align-items:center;gap:20px;margin-bottom:44px}
.snd{font:italic 400 2.5rem/1 var(--serif);color:var(--ac);flex:none}
.bh h2{font-size:clamp(1.75rem,3vw,2.35rem);min-width:0}
.rule{flex:1;min-width:32px;height:11px;border-bottom:1px solid var(--ln2);background:repeating-linear-gradient(90deg,var(--ln2) 0 1px,transparent 1px 16px)}
.tick{position:relative;border:1px solid var(--ln2)}
.tick::before,.tick::after{content:"";position:absolute;width:18px;height:18px;pointer-events:none}
.tick::before{left:-1px;top:-1px;border-left:3px solid var(--ac);border-top:3px solid var(--ac)}
.tick::after{right:-1px;bottom:-1px;border-right:3px solid var(--ac);border-bottom:3px solid var(--ac)}
.paper{--bg:#e3f3ec;--ac:#0a6b52;--tx:#062019;--mu:#2c4a41;--ln2:rgba(6,32,25,.4);--ln:rgba(6,32,25,.18);background:var(--paper);color:var(--ink)}
.paper .btn{background:var(--ink);color:var(--paper);box-shadow:0 0 0 3px var(--paper),0 0 0 4px var(--ink)}
.paper .btn:hover{background:#0f3a2e}
.paper .btn .kg{color:var(--amb)}
.paper .btn.ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.paper .btn.ghost:hover{background:rgba(6,32,25,.08)}

/* ---------- compass rose ---------- */
.rose{display:block;color:var(--ac)}
.rr{fill:none;stroke:currentColor;stroke-width:1}
.rt{fill:none;stroke:currentColor;stroke-width:7;stroke-dasharray:1 8.337}
.rd{fill:none;stroke:currentColor;stroke-width:.8;stroke-dasharray:2 5;opacity:.7}
.ro{fill:var(--bg);stroke:currentColor;stroke-width:1;stroke-linejoin:round}
.rf{fill:currentColor;stroke:currentColor;stroke-width:1;stroke-linejoin:round}
.rc{fill:var(--bg);stroke:currentColor;stroke-width:1.5}
.rn{fill:var(--amb)}
.r-hero .rt{transform-box:fill-box;transform-origin:center;animation:turn 180s linear infinite}
@keyframes turn{to{transform:rotate(360deg)}}

/* ---------- hero ---------- */
.hero,.phead{background-image:var(--contour),linear-gradient(#103329,#0b251e);background-repeat:no-repeat;background-size:1500px auto,cover;background-position:right -260px top -160px,0 0;border-top:0}
.hero{padding:76px 0 84px;--bg:#0d2c24}
.hero-g{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,.65fr);gap:56px;align-items:center}
.eyebrow{font:italic 400 1.02rem/1.3 var(--serif);letter-spacing:.24em;text-transform:uppercase;color:var(--ac);margin-bottom:20px}
.hero h1{font-size:clamp(2.3rem,4.7vw,4.1rem);line-height:1.03}
.lead{margin-top:22px;max-width:60ch;font-size:1.14rem;line-height:1.6;color:#cfe3da}
.marks{list-style:none;display:flex;flex-wrap:wrap;gap:10px 30px;margin-top:34px}
.marks li{display:flex;align-items:center;gap:10px;font:400 .86rem/1.3 var(--mono);letter-spacing:.03em;color:var(--mu)}
.marks .sym{width:22px;height:22px}
.sym{width:36px;height:36px;flex:none;fill:none;stroke:var(--ac);stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.r-hero{width:100%;max-width:400px;margin-left:auto}
.hero-b{display:grid;grid-template-columns:minmax(0,340px) minmax(0,1fr);gap:36px;margin-top:64px;align-items:stretch}
.sound{padding:22px 24px 10px;background:rgba(6,19,15,.55)}
.cap{display:flex;align-items:center;gap:8px;font:400 .8rem/1.3 var(--mono);letter-spacing:.04em;color:var(--mu);margin-bottom:10px;min-width:0}
.cap code{min-width:0;overflow-wrap:anywhere}
.cap-i{font:italic 400 1rem/1.3 var(--serif);letter-spacing:.2em;text-transform:uppercase;color:var(--ac);margin-bottom:14px}
.try{min-width:0}
.facts .fact{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding:12px 0;border-top:1px dashed var(--ln2)}
.facts dt{font:400 .8rem/1.35 var(--mono);letter-spacing:.03em;color:var(--mu);min-width:0}
.facts dd{font:italic 400 1.6rem/1 var(--serif);color:var(--ac);white-space:nowrap}
.facts.big dd{font-size:2.3rem}
.facts.big .fact{padding:18px 0}
.facts.rows .fact:first-child{border-top:0}

/* ---------- code ---------- */
.codebox{border:1px solid var(--ln2);background:var(--plate);min-width:0}
.codetabs{display:flex;border-bottom:1px solid var(--ln2);overflow-x:auto}
.codetabs button{min-height:46px;padding:0 20px;border:0;border-right:1px solid var(--ln2);background:transparent;color:var(--mu);font:400 .85rem/1 var(--mono);letter-spacing:.05em;cursor:pointer}
.codetabs button:hover{color:var(--tx)}
.codetabs button[aria-selected="true"]{background:var(--ac);color:#04130e;font-weight:600}
pre.code{position:relative;margin:0;padding:58px 22px 22px;overflow-x:auto;max-width:100%;background:var(--plate);color:#d3ebe2;font:400 .88rem/1.65 var(--mono);-webkit-overflow-scrolling:touch;tab-size:2}
pre.code code{font:inherit;background:none;padding:0;color:inherit;white-space:pre}
pre.code .k{color:var(--ac)}
pre.code .s{color:#f0dcae}
pre.code .c{color:#86a99c;font-style:italic}
.copy{position:absolute;top:7px;right:8px;min-height:44px;min-width:64px;padding:0 12px;border:1px solid var(--ln2);border-radius:2px;background:var(--plate);color:var(--mu);font:400 .76rem/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;cursor:pointer}
.copy:hover{color:var(--ac);border-color:var(--ac)}

/* ---------- legend ---------- */
.legend{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--ln)}
.legend.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.lg{display:grid;grid-template-columns:36px minmax(0,1fr);gap:18px;padding:30px 28px;background:var(--bg)}
.lg h3{margin-bottom:8px}
.lg p,.inset p,.wp p{color:var(--mu);font-size:.96rem;line-height:1.6}

/* ---------- course line ---------- */
.b-course{background-image:var(--contour);background-repeat:no-repeat;background-size:1700px auto;background-position:left -700px top -300px}
.course{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,1fr);align-items:start}
.course.np{grid-template-columns:minmax(0,1fr)}
.course ol{list-style:none;display:grid;grid-template-columns:repeat(3,minmax(0,1fr))}
.wp{position:relative;padding:60px 32px 0 0}
.wp::before{content:"";position:absolute;left:0;right:0;top:19px;border-top:2px dashed var(--ln2)}
.wpn{position:absolute;left:0;top:0;width:40px;height:40px;display:grid;place-items:center;border:2px solid var(--ac);border-radius:50%;background:var(--bg);color:var(--ac);font:600 1rem/1 var(--mono)}
.wp h3{margin-bottom:8px;font-size:1.14rem}
.port{position:relative;padding-top:68px}
.buoy{position:absolute;left:0;top:-6px;width:52px;height:52px;display:grid;place-items:center;border:2px solid var(--amb);border-radius:50%;background:var(--bg);color:var(--amb);box-shadow:0 0 0 5px var(--bg),0 0 0 6px rgba(255,179,71,.45)}
.np .wp:last-child::before{right:32px}

/* ---------- inset charts / examples ---------- */
.insets{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:22px}
.inset{padding:26px 24px 28px;background:rgba(6,19,15,.4)}
.num{display:block;font:italic 400 2.1rem/1 var(--serif);color:var(--ac);margin-bottom:16px}
.inset h3{margin-bottom:8px}
.exs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr))}
.ex{padding:4px 30px 4px 30px;border-left:1px dashed var(--ln2)}
.ex h3{margin-bottom:12px;line-height:1.45}
.ex p{font:400 .88rem/1.7 var(--mono);color:var(--mu)}

/* ---------- prose ---------- */
.prose{min-width:0;max-width:780px;color:#d2e6dd}
.prose.solo{margin:0 auto}
.prose>*+*{margin-top:1.05em}
.prose h2{font-size:clamp(1.6rem,2.6vw,2.05rem);color:var(--tx);margin-top:2.1em;padding-top:1.1em;border-top:1px solid var(--ln2);background:repeating-linear-gradient(90deg,var(--ln2) 0 1px,transparent 1px 16px) 0 0/100% 9px no-repeat;scroll-margin-top:96px}
.prose>h2:first-child{margin-top:0}
.prose h3{font-size:1.16rem;color:var(--tx);margin-top:1.9em}
.prose h3+pre.code{margin-top:.8em}
.prose ul,.prose ol{padding-left:1.4em}
.prose li{margin-top:.45em}
.prose li::marker{color:var(--ac);font-family:var(--mono)}
.prose strong{color:var(--tx);font-weight:600}
.prose a{text-underline-offset:3px}
.prose :not(pre)>code{font:400 .9em var(--mono);background:rgba(69,224,180,.12);padding:2px 6px;border-radius:2px;color:#c9f5e6;overflow-wrap:anywhere}
.prose pre.code{border:1px solid var(--ln2);margin-top:1.3em}
.prose table{display:block;max-width:100%;overflow-x:auto;border-collapse:collapse;font-size:.94rem;margin-top:1.4em}
.prose th,.prose td{padding:11px 16px;border:1px solid var(--ln2);text-align:left;vertical-align:top}
.prose th{font:600 .78rem/1.3 var(--mono);letter-spacing:.07em;text-transform:uppercase;color:var(--ac);background:rgba(69,224,180,.07);white-space:nowrap}
.prose blockquote{margin:1.4em 0 0;padding:4px 0 4px 20px;border-left:3px solid var(--ac);font:italic 400 1.2rem/1.5 var(--serif)}
.read{font-size:1.08rem;line-height:1.8;max-width:720px}

/* ---------- FAQ ---------- */
.faq{max-width:900px}
.faq details{border-top:1px solid var(--ln2)}
.faq details:last-child{border-bottom:1px solid var(--ln2)}
.faq summary{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:60px;padding:14px 0;cursor:pointer;list-style:none;font:600 1.06rem/1.4 var(--sans)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";flex:none;width:14px;height:14px;background:linear-gradient(var(--ac),var(--ac)) 50%/100% 2px no-repeat,linear-gradient(var(--ac),var(--ac)) 50%/2px 100% no-repeat;transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq summary:hover{color:var(--ac)}
.faq details p{padding:0 40px 22px 0;color:var(--mu);max-width:74ch}

/* ---------- CTA ---------- */
.b-cta{padding:72px 0 88px}
.cta{display:grid;grid-template-columns:118px minmax(0,1fr) auto;gap:38px;align-items:center;padding:40px 46px}
.cta h2{font-size:clamp(1.7rem,3vw,2.4rem);margin-bottom:10px}
.cta p{color:var(--mu);max-width:52ch}
.cta-a{display:flex;flex-direction:column;gap:16px}
.r-cta{width:118px}

/* ---------- page heads ---------- */
.phead{padding:52px 0 64px}
.phead h1{font-size:clamp(2.15rem,4.3vw,3.5rem);max-width:19em}
.fix{display:flex;flex-wrap:wrap;align-items:center;gap:4px 10px;margin-bottom:22px;font:400 .8rem/1.3 var(--mono);letter-spacing:.05em;color:var(--mu)}
.fix a{display:inline-flex;align-items:center;min-height:44px;color:var(--ac);text-decoration:none}
.fix a:hover{text-decoration:underline}
.fix i{font-style:normal;opacity:.6}
.fix span{min-width:0}
.upd{margin-top:20px;font:400 .82rem/1.3 var(--mono);letter-spacing:.05em;color:var(--mu)}
.sub{margin-top:22px;padding-left:14px;border-left:3px solid var(--ac);font:400 .92rem/1.5 var(--mono);color:var(--tx)}

/* ---------- key page ---------- */
.k-g{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,470px);gap:64px;align-items:start}
.khero h1{font-size:clamp(2.15rem,4vw,3.3rem)}
.k-facts{margin-top:34px;max-width:440px;border-top:1px solid var(--ln2);border-bottom:1px solid var(--ln2)}
.harbour{position:relative;padding:7px;border:1px solid var(--ac)}
.harbour::before,.harbour::after{content:"";position:absolute;width:22px;height:22px;pointer-events:none}
.harbour::before{left:-7px;top:-7px;border-left:3px solid var(--amb);border-top:3px solid var(--amb)}
.harbour::after{right:-7px;bottom:-7px;border-right:3px solid var(--amb);border-bottom:3px solid var(--amb)}
.form{background:var(--paper);color:var(--ink);padding:30px 30px 26px;--bg:#e3f3ec}
.tabs2{display:grid;grid-template-columns:1fr 1fr;border:1.5px solid var(--ink);margin-bottom:22px}
.tabs2 button{min-height:46px;padding:0 10px;border:0;background:transparent;color:var(--ink);font:600 .95rem/1.2 var(--sans);cursor:pointer}
.tabs2 button[aria-selected="true"]{background:var(--ink);color:var(--paper)}
.msg{display:none}
.msg.err,.msg:not(:empty){display:block;margin-bottom:18px;padding:12px 14px;border-left:4px solid #b3261e;background:#ffe3de;color:#7a1408;font-size:.93rem;line-height:1.45}
.form .row{margin-bottom:16px}
.form label,.calc label{display:block;margin-bottom:7px;font:600 .76rem/1.3 var(--mono);letter-spacing:.09em;text-transform:uppercase;color:#1d3d34}
.form input,.calc input{display:block;width:100%;height:50px;padding:0 14px;border:1.5px solid var(--ink);border-radius:2px;background:#f7fcfa;color:var(--ink);font:400 1rem var(--sans)}
.form input:focus,.calc input:focus{outline:3px solid #0a6b52;outline-offset:1px}
.form .note{margin-top:8px;font-size:.84rem;line-height:1.45;color:#2c4a41}
.form .btn{background:var(--ink);color:var(--paper);box-shadow:none}
.form .btn:hover{background:#0f3a2e}
.form .btn[data-submit]{width:100%;min-height:54px;margin-top:6px;font-size:1.02rem}
.form .btn.ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.form .btn.ghost:hover{background:rgba(6,32,25,.08)}
.keyout{display:none}
.keyout.on{display:block}
.keyout h3{font:400 1.6rem/1.1 var(--serif);margin-bottom:14px}
.keybox{display:flex;align-items:center;gap:10px;padding:8px 8px 8px 14px;background:var(--ink);color:#9ff0d4;font:400 .92rem/1.4 var(--mono)}
.keybox span{flex:1;min-width:0;overflow-wrap:anywhere}
.keybox .btn{background:var(--ac);color:#04130e;flex:none}
.keybox .btn:hover{background:#7cf0cf}
.keyout p{margin-top:12px;font-size:.94rem;line-height:1.7}
.keyout code{font:400 .9em var(--mono);overflow-wrap:anywhere}
.keyout .mut{color:#2c4a41}
.acts{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}

/* ---------- pricing ---------- */
.pr-g{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,440px);gap:64px;align-items:center}
.rates{padding:8px 30px;background:rgba(6,19,15,.55)}
.calc-w{padding:34px 36px 38px}
.calc{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr) minmax(0,1.1fr);gap:28px;align-items:end}
.calc>div{min-width:0}
.calc output{display:block;height:50px;border-bottom:4px double var(--ink);font:italic 400 2.7rem/46px var(--serif);color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* ---------- docs / article ---------- */
.b-doc{padding-top:64px}
.doc-g{display:grid;grid-template-columns:280px minmax(0,1fr);gap:72px;align-items:start}
.art-g{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:72px;align-items:start}
.art-m{min-width:0}
.rail{position:sticky;top:98px;max-height:calc(100vh - 112px);overflow:auto;padding:4px;min-width:0}
.toc{padding:20px 22px 12px;background:rgba(6,19,15,.5)}
.toc-h,.side-h,.take-h{font:italic 400 .98rem/1.3 var(--serif);letter-spacing:.2em;text-transform:uppercase;color:var(--ac);margin-bottom:8px}
.toc ol{list-style:none;counter-reset:t}
.toc li{counter-increment:t;border-top:1px dashed var(--ln2)}
.toc li:first-child{border-top:0}
.toc a{display:grid;grid-template-columns:26px minmax(0,1fr);align-items:baseline;min-height:44px;padding:11px 0;color:var(--mu);text-decoration:none;font-size:.92rem;line-height:1.4}
.toc a::before{content:counter(t);font:italic 400 1.05rem/1 var(--serif);color:var(--ac)}
.toc a:hover{color:var(--tx)}
.side{margin-top:22px;padding:22px 22px 26px}
.side p{font-size:.94rem;line-height:1.5}
.side .btn{margin-top:18px;width:100%}
.take{padding:26px 32px 22px;margin-bottom:48px}
.take ol{list-style:none;counter-reset:k}
.take li{counter-increment:k;display:grid;grid-template-columns:34px minmax(0,1fr);align-items:baseline;padding:11px 0;border-top:1px dashed var(--ln2);line-height:1.55}
.take li::before{content:counter(k);font:italic 400 1.4rem/1 var(--serif);color:var(--ac)}

/* ---------- 404 ---------- */
.nf{padding:90px 0 110px}
.r-nf{width:170px;margin-bottom:34px}
.nf h1{font-size:clamp(2.2rem,5vw,3.8rem)}
.nf-l{list-style:none;display:flex;flex-wrap:wrap;gap:0 28px;margin-top:26px}
.nf-l a{display:inline-flex;align-items:center;min-height:44px}

/* ---------- footer ---------- */
.foot{--bg:#040d0a;background:var(--bg) var(--contour) no-repeat right -500px top -260px/1500px auto}
.foot-in{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:40px 64px;padding-top:56px;padding-bottom:40px}
.foot-tag{margin-top:12px;color:var(--mu);max-width:36ch}
.readout{display:flex;align-items:center;gap:8px;margin-top:16px;font:400 .82rem/1.3 var(--mono);color:var(--mu);min-width:0}
.readout code{font:inherit;min-width:0;overflow-wrap:anywhere}
.foot-l{list-style:none;columns:2;column-gap:40px}
.foot-l li{break-inside:avoid}
.foot-l a{display:inline-flex;align-items:center;min-height:44px;color:var(--tx);text-decoration:none;font-size:.95rem}
.foot-l a:hover{color:var(--ac);text-decoration:underline}
.legal{grid-column:1/-1;padding-top:22px;border-top:1px solid var(--ln);color:var(--mu);font-size:.84rem;line-height:1.6}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .insets{grid-template-columns:repeat(2,minmax(0,1fr))}
  .legend{grid-template-columns:repeat(2,minmax(0,1fr))}
  .doc-g{grid-template-columns:240px minmax(0,1fr);gap:44px}
  .art-g{grid-template-columns:minmax(0,1fr) 250px;gap:44px}
  .k-g,.pr-g{gap:40px}
  .cta{grid-template-columns:minmax(0,1fr) auto}
  .r-cta{display:none}
}
@media (max-width:900px){
  .wrap{padding:0 18px}
  .band{padding:64px 0}
  .burger{display:grid}
  .hbtn{margin-left:auto}
  .nav{display:none;position:absolute;left:0;right:0;top:100%;margin:0;flex-direction:column;align-items:stretch;gap:0;padding:6px 18px 14px;background:#06130f;border-bottom:1px solid var(--ac)}
  .nav.open{display:flex}
  .nav a{min-height:50px;padding:0 4px;border-top:1px dashed var(--ln2);font-size:.92rem}
  .nav a:first-child{border-top:0}
  .nav a[aria-current]::after{left:auto;right:8px;bottom:50%;margin:0 0 -3.5px}
  .hero{padding:44px 0 60px}
  .hero-g{display:block;position:relative}
  .hero-t{position:relative;z-index:1}
  .hero-a{position:absolute;right:-120px;top:-70px;width:300px;opacity:.3}
  .hero-b{grid-template-columns:minmax(0,1fr);gap:30px;margin-top:44px}
  .try{order:-1}
  .phead{padding:30px 0 48px}
  .k-g{display:flex;flex-direction:column;gap:30px}
  .k-t{display:contents}
  .k-t>.fix{order:0;margin-bottom:-14px}
  .k-t>h1{order:1;margin-bottom:-12px}
  .k-t>.lead{order:2;margin-top:0}
  .k-f{order:3;width:100%;max-width:520px}
  .k-facts{order:4;margin-top:6px;width:100%;max-width:520px}
  .pr-g{grid-template-columns:minmax(0,1fr);gap:36px}
  .course,.course ol{grid-template-columns:minmax(0,1fr)}
  .wp{padding:6px 0 34px 62px}
  .wp::before,.np .wp:last-child::before{left:19px;right:auto;top:0;bottom:0;border-top:0;border-left:2px dashed var(--ln2)}
  .np .wp:last-child::before{bottom:auto;height:20px}
  .port{padding:6px 0 0 62px}
  .buoy{left:-6px}
  .exs{grid-template-columns:minmax(0,1fr);gap:28px}
  .ex{padding:0 0 0 22px}
  .calc{grid-template-columns:minmax(0,1fr);gap:20px}
  .doc-g,.art-g{grid-template-columns:minmax(0,1fr);gap:36px}
  .art-g .rail{order:-1}
  .rail{position:static;max-height:none;overflow:visible;padding:0}
  .side{display:none}
  .cta{grid-template-columns:minmax(0,1fr);gap:26px;padding:32px 26px}
  .cta-a{flex-direction:row;flex-wrap:wrap}
  .foot-in{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:620px){
  .legend,.legend.two,.insets{grid-template-columns:minmax(0,1fr)}
  .lg{padding:24px 20px}
  .bh{gap:14px;margin-bottom:32px}
  .snd{font-size:2rem}
  .rule{display:none}
  .form{padding:24px 20px 22px}
  .calc-w{padding:26px 20px 30px}
  .rates{padding:6px 20px}
  .take{padding:22px 20px 16px}
  .lead{font-size:1.06rem}
  .faq details p{padding-right:0}
  .foot-l{columns:1}
  pre.code{padding:58px 16px 18px;font-size:.82rem}
  .codetabs button{padding:0 16px}
}
@media (max-width:420px){
  .logo{font-size:1.14rem;gap:7px}
  .mark{width:28px;height:28px}
  .hbtn{padding:0 11px;font-size:.86rem}
  .hbtn .kg{display:none}
  .top-in{gap:8px}
  .acts-row .btn{flex:1 1 100%}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}