:root{--ink:#14211f;--muted:#4a5a57;--teal:#0f4c45;--teal-2:#176b60;--teal-50:#e7f2ef;--accent:#d9822b;--accent-50:#fbefe2;--bg:#f8f6f1;--card:#fff;--line:#dfe5e2;--warn:#8a4b00;--warn-bg:#fff4e0;--radius:14px;--shadow:0 1px 2px rgba(0,0,0,.05),0 6px 20px rgba(15,76,69,.07);--font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;--serif:Georgia,"Iowan Old Style","Times New Roman",serif}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.6;font-size:1.0625rem}
img,svg,canvas{max-width:100%}
a{color:var(--teal-2);text-underline-offset:2px}a:hover{color:var(--teal)}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
.skip{position:absolute;left:-999px;top:0;background:var(--teal);color:#fff;padding:.6rem 1rem;z-index:10}.skip:focus{left:1rem}
.wrap{max-width:1120px;margin:0 auto;padding:0 1.1rem}
h1,h2,h3{font-family:var(--serif);line-height:1.2;color:var(--teal);letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,5vw,2.9rem);margin:.2em 0 .4em}h2{font-size:clamp(1.4rem,3.2vw,1.85rem);margin:2rem 0 .6rem}h3{font-size:1.2rem;margin:1.2rem 0 .4rem}
header.site{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.nav{display:flex;align-items:center;justify-content:space-between;min-height:64px;gap:1rem}
.logo{display:flex;align-items:center;gap:.5rem;text-decoration:none;color:var(--teal);font-family:var(--serif);font-size:1.35rem;font-weight:700;white-space:nowrap}
.logo .by{color:var(--accent);font-style:italic;font-weight:600}
.menu-btn{display:inline-flex;align-items:center;gap:.4rem;background:none;border:1px solid var(--line);border-radius:10px;padding:.45rem .75rem;font:inherit;color:var(--teal);cursor:pointer}
nav.main ul{list-style:none;margin:0;padding:0}
nav.main{display:none;width:100%}nav.main.open{display:block}
nav.main a{display:block;padding:.65rem .2rem;text-decoration:none;color:var(--ink);border-top:1px solid var(--line);font-weight:500}
nav.main a[aria-current=page]{color:var(--teal);font-weight:700}
.nav{flex-wrap:wrap}
@media(min-width:960px){.menu-btn{display:none}nav.main{display:block!important;width:auto}nav.main ul{display:flex;gap:.9rem}nav.main a{border:0;padding:.3rem 0;font-size:.93rem}nav.main a[aria-current=page]{box-shadow:inset 0 -3px 0 var(--accent)}.nav{flex-wrap:nowrap}}
.hero{background:linear-gradient(135deg,var(--teal) 0%,#0b3a35 100%);color:#fff;padding:3rem 0 2.6rem}
.hero h1{color:#fff}.hero p{max-width:640px;font-size:1.15rem;color:#d8ebe7}
.hero .cta{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:1.3rem}
.btn{display:inline-block;padding:.7rem 1.15rem;border-radius:999px;background:var(--accent);color:#1e1206;font-weight:700;text-decoration:none;border:0;font:inherit;font-weight:700;cursor:pointer}
.btn:hover{background:#c5711f;color:#1e1206}.btn.ghost{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.55)}
.btn[disabled]{background:#cfd6d4;color:#4a5a57;cursor:not-allowed}
.page-head{background:var(--teal-50);border-bottom:1px solid var(--line);padding:2rem 0 1.4rem}
.page-head p{max-width:720px;color:var(--muted);margin:0}
.crumb{font-size:.9rem;color:var(--muted)}
main{padding-bottom:3rem}
.grid{display:grid;gap:1rem;grid-template-columns:1fr}
@media(min-width:640px){.grid.g2,.grid.g3{grid-template-columns:1fr 1fr}}
@media(min-width:960px){.grid.g3{grid-template-columns:repeat(3,1fr)}.cols{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:2.2rem}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem 1.25rem;box-shadow:var(--shadow)}
.card h3{margin-top:0}.card p{margin:.3rem 0 .8rem;color:var(--muted)}
a.card{display:block;text-decoration:none;color:inherit;transition:transform .15s}a.card:hover{transform:translateY(-2px);border-color:var(--teal-2)}
.tag{display:inline-block;font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--teal-2);background:var(--teal-50);border-radius:999px;padding:.15rem .6rem}
.tag.soon{color:var(--warn);background:var(--warn-bg)}
.numbers{background:#fff;border-bottom:1px solid var(--line)}
.numbers .wrap{display:grid;grid-template-columns:1fr;gap:.8rem;padding-top:1.2rem;padding-bottom:1.2rem}
@media(min-width:760px){.numbers .wrap{grid-template-columns:auto 1fr 1fr 1fr;align-items:center}}
.numbers h2{margin:0;font-size:1.1rem}
.kn{border-left:4px solid var(--accent);padding:.2rem .8rem}.kn b{display:block;font-size:1.5rem;color:var(--teal);font-family:var(--serif)}.kn small{color:var(--muted);display:block;line-height:1.4}
.note{background:var(--teal-50);border-left:4px solid var(--teal-2);padding:.8rem 1rem;border-radius:8px;margin:1rem 0}
.banner{background:var(--warn-bg);border:2px dashed #e0a24a;color:var(--warn);padding:.8rem 1rem;border-radius:10px;font-weight:700;margin:1rem 0}
.flag{background:#fff7ec;border-left:4px solid var(--accent);padding:.8rem 1rem;border-radius:8px;margin:1rem 0}
.src{font-size:.85rem;color:var(--muted)}
table{border-collapse:collapse;width:100%;font-size:.95rem;background:#fff}
th,td{text-align:left;padding:.6rem .7rem;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--teal-50);color:var(--teal);font-weight:700;white-space:nowrap}
th button{all:unset;cursor:pointer}th button:focus-visible{outline:3px solid var(--accent)}
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:10px;-webkit-overflow-scrolling:touch}
.filters{display:flex;flex-wrap:wrap;gap:.8rem 1.2rem;align-items:flex-end;margin:1rem 0}
label{font-weight:600;font-size:.95rem;display:block}
input,select{font:inherit;padding:.55rem .65rem;border:1px solid #b8c4c1;border-radius:8px;background:#fff;width:100%;color:var(--ink)}
.check{display:flex;gap:.45rem;align-items:center}.check input{width:auto}
.calc{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem;box-shadow:var(--shadow);margin:1.2rem 0}
.calc .fields{display:grid;gap:.9rem;grid-template-columns:1fr}
@media(min-width:640px){.calc .fields{grid-template-columns:1fr 1fr}}
.results{display:grid;gap:.8rem;grid-template-columns:1fr;margin-top:1.1rem}
@media(min-width:640px){.results{grid-template-columns:repeat(3,1fr)}}
.res{background:var(--teal-50);border-radius:10px;padding:.8rem}.res span{display:block;font-size:.85rem;color:var(--muted)}.res b{font-size:1.35rem;color:var(--teal);font-family:var(--serif)}
.hint{font-size:.85rem;color:var(--muted);font-weight:400}
aside .card{position:sticky;top:84px}
.toc a{display:block;padding:.2rem 0}
.az{display:flex;flex-wrap:wrap;gap:.3rem;margin:.8rem 0}.az a{padding:.2rem .5rem;border:1px solid var(--line);border-radius:6px;text-decoration:none;background:#fff;font-weight:600}
dl.gloss dt{font-weight:700;color:var(--teal);margin-top:1rem}dl.gloss dd{margin:.2rem 0 0;color:var(--ink)}
footer.site{background:#0b3a35;color:#cfe3df;padding:2.2rem 0;font-size:.93rem}
footer.site a{color:#fff}footer.site .disc{border:1px solid rgba(255,255,255,.2);border-radius:10px;padding:1rem;margin-bottom:1.2rem;background:rgba(255,255,255,.04)}
footer.site ul{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:.4rem 1.2rem}
.signup{display:grid;gap:.6rem;grid-template-columns:1fr}@media(min-width:640px){.signup{grid-template-columns:1fr auto}}
.chart-box{position:relative;width:100%;height:260px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}
.hbars{margin:.8rem 0 .4rem;display:grid;gap:.45rem;max-width:640px}
.hbar{display:grid;grid-template-columns:minmax(6.5rem,9rem) 1fr auto;gap:.6rem;align-items:center;font-size:.9rem}
.hbar-l{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.hbar-t{background:var(--teal-50);border-radius:6px;height:14px;overflow:hidden}
.hbar-f{display:block;height:100%;background:var(--teal-2);border-radius:6px}.hbar-v{font-variant-numeric:tabular-nums;color:var(--muted);min-width:3.5rem;text-align:right}
@media(max-width:640px){.t5 th,.t5 td{padding:.45rem .35rem;font-size:.82rem;white-space:normal}}

/* grouped nav */
nav.main details>summary{list-style:none;cursor:pointer;padding:.65rem .2rem;border-top:1px solid var(--line);font-weight:600;color:var(--ink)}
nav.main details>summary::-webkit-details-marker{display:none}
nav.main details>summary::after{content:" ▾";color:var(--muted)}
nav.main details>summary.cur{color:var(--teal);font-weight:700}
nav.main details ul{padding-left:1rem}
@media(min-width:960px){nav.main ul{align-items:center}
 nav.main .dd{position:relative}nav.main details>summary{border:0;padding:.3rem 0;font-size:.93rem}
 nav.main details[open]>ul{position:absolute;top:2.2rem;left:-.8rem;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);padding:.4rem .8rem;display:block;min-width:190px;z-index:20}
 nav.main details ul a{padding:.4rem 0}nav.main details>summary.cur{box-shadow:inset 0 -3px 0 var(--accent)}}

.card.feature{margin-top:1.6rem;background:linear-gradient(135deg,#fff 0%,var(--accent-50) 100%);border:2px solid #f0c48f}.card.feature h2{color:var(--teal)}
.step{display:grid;gap:1rem 2rem;grid-template-columns:1fr;align-items:center;padding:1.6rem 0;border-bottom:1px solid var(--line)}
@media(min-width:860px){.step{grid-template-columns:1fr 1fr}.step:nth-of-type(even) .fig{order:-1}}
.step .num{display:inline-flex;width:2rem;height:2rem;border-radius:50%;background:var(--accent);color:#1e1206;font-weight:800;align-items:center;justify-content:center;margin-right:.5rem}
.step h2{margin-top:0;display:flex;align-items:center}.fig{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1rem;box-shadow:var(--shadow)}
.fig svg{display:block;width:100%;height:auto}.fig figcaption{font-size:.85rem;color:var(--muted);margin-top:.5rem}
html.anim .step{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}html.anim .step.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){html.anim .step{opacity:1;transform:none}}
@media(min-width:960px){nav.main details ul{display:block;white-space:nowrap}}