:root{
  --ink:#0d232b; --muted:#4d6873; --line:#dbe8ec;
  --sea-900:#0b3b47; --sea-700:#0f5a6c; --sea-500:#1a8ba4; --sea-200:#a9dde8;
  --sky:#f1f9fb; --sand:#fbf5ea; --sand-2:#efe0c8; --sun:#e08c3f; --white:#fff;
  --radius:18px; --shadow:0 8px 28px rgba(11,59,71,.09);
  --wrap:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{margin:0;font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--white);line-height:1.72;font-size:17px;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4,.brand{font-family:"Outfit","Inter",-apple-system,"Segoe UI",Roboto,sans-serif;line-height:1.2;letter-spacing:-.015em}
h1{font-size:clamp(1.95rem,4.4vw,3rem);margin:.2em 0 .35em;font-weight:700}
h2{font-size:clamp(1.4rem,2.7vw,1.95rem);margin:2.4em 0 .5em;font-weight:650}
h3{font-size:clamp(1.12rem,2vw,1.35rem);margin:1.9em 0 .4em;font-weight:600;color:var(--sea-900)}
p{margin:0 0 1.05em}
a{color:var(--sea-700);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{color:var(--sun)}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}

/* header */
.top{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.93);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line)}
.top-in{max-width:var(--wrap);margin:0 auto;padding:10px 20px;display:flex;align-items:center;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.16rem;color:var(--sea-900);
  text-decoration:none;white-space:nowrap}
.brand svg{width:30px;height:30px;flex:none}
.brand span i{font-style:normal;color:var(--sea-500)}
nav.main{margin-left:auto;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}
nav.main::-webkit-scrollbar{display:none}
nav.main ul{display:flex;gap:4px;list-style:none;margin:0;padding:0}
nav.main a{display:block;padding:7px 11px;border-radius:999px;font-size:.875rem;font-weight:500;
  color:var(--sea-900);text-decoration:none;white-space:nowrap}
nav.main a:hover{background:var(--sky);color:var(--sea-700)}
nav.main a[aria-current="page"]{background:var(--sea-900);color:#fff}
@media(max-width:900px){
  .top-in{flex-direction:column;align-items:stretch;gap:8px;padding:10px 14px}
  nav.main{margin-left:0;margin:0 -14px;padding:0 14px 2px}
  nav.main a{font-size:.83rem;padding:6px 10px;background:var(--sky)}
}

/* breadcrumbs */
.crumbs{background:var(--sky);border-bottom:1px solid var(--line);font-size:.83rem}
.crumbs ol{max-width:var(--wrap);margin:0 auto;padding:9px 20px;list-style:none;display:flex;flex-wrap:wrap;gap:6px}
.crumbs li:not(:last-child)::after{content:"›";margin-left:6px;color:var(--muted)}
.crumbs a{color:var(--sea-700);text-decoration:none}
.crumbs a:hover{text-decoration:underline}
.crumbs [aria-current]{color:var(--muted)}

/* hero */
.hero{background:linear-gradient(170deg,var(--sky) 0%,#fff 65%);padding:34px 0 8px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:34px;align-items:center}
.hero figure{margin:0}
.hero img{border-radius:var(--radius);box-shadow:var(--shadow);aspect-ratio:4/3;object-fit:cover;width:100%}
.kicker{display:inline-block;background:var(--sand-2);color:#7a4a12;font-size:.74rem;font-weight:700;
  letter-spacing:.09em;text-transform:uppercase;padding:5px 12px;border-radius:999px}
.lede{font-size:1.08rem;color:var(--muted)}
@media(max-width:820px){.hero-grid{grid-template-columns:1fr;gap:20px}}

/* tldr + toc */
.tldr{background:var(--sand);border:1px solid var(--sand-2);border-left:5px solid var(--sun);
  border-radius:14px;padding:16px 20px;margin:26px 0}
.tldr b{display:block;font-size:.76rem;letter-spacing:.1em;text-transform:uppercase;color:#8a5a1c;margin-bottom:4px}
.tldr p{margin:0}
.toc{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 22px;margin:26px 0}
.toc>b{display:block;font-family:"Outfit",sans-serif;font-size:1rem;margin-bottom:8px;color:var(--sea-900)}
.toc ol{margin:0;padding-left:20px;font-size:.94rem}
.toc ol ol{padding-left:18px;margin:2px 0 6px;list-style:lower-alpha;color:var(--muted)}
.toc li{margin:2px 0}
.toc a{text-decoration:none}
.toc a:hover{text-decoration:underline}

/* article */
article{max-width:820px}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:44px;padding:8px 0 60px;align-items:start}
@media(max-width:980px){.layout{grid-template-columns:1fr}aside.rail{order:2}}
article ul,article ol{margin:0 0 1.15em;padding-left:22px}
article li{margin:.3em 0}
article figure{margin:26px 0}
article figure img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%;aspect-ratio:16/10;object-fit:cover}
figcaption{font-size:.83rem;color:var(--muted);margin-top:8px;text-align:center}
.tblwrap{overflow-x:auto;margin:0 0 1.4em}
table{border-collapse:collapse;width:100%;font-size:.92rem;min-width:520px}
th,td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
th{background:var(--sea-900);color:#fff;font-weight:600}
tbody tr:nth-child(even){background:var(--sky)}
blockquote{margin:26px 0;padding:14px 20px;border-left:4px solid var(--sea-200);background:var(--sky);
  border-radius:0 12px 12px 0;color:var(--sea-900)}
.note{background:var(--sky);border:1px dashed var(--sea-200);border-radius:14px;padding:14px 18px;margin:24px 0}

/* faq */
.faq details{border:1px solid var(--line);border-radius:12px;margin:8px 0;background:#fff}
.faq summary{cursor:pointer;padding:13px 16px;font-weight:600;font-family:"Outfit",sans-serif;color:var(--sea-900)}
.faq details[open] summary{border-bottom:1px solid var(--line)}
.faq .a{padding:12px 16px}
.faq .a p:last-child{margin:0}

/* rail */
aside.rail{position:sticky;top:96px;font-size:.93rem}
.rail .box{border:1px solid var(--line);border-radius:16px;padding:16px 18px;margin-bottom:18px;background:#fff}
.rail .box.tint{background:var(--sand);border-color:var(--sand-2)}
.rail b.hd{display:block;font-family:"Outfit",sans-serif;color:var(--sea-900);margin-bottom:8px}
.rail ul{list-style:none;margin:0;padding:0}
.rail li{margin:6px 0}
.rail a{text-decoration:none}
.rail a:hover{text-decoration:underline}

/* cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:22px;margin:26px 0}
.card{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;
  transition:transform .18s ease,box-shadow .18s ease;display:flex;flex-direction:column}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.card img{aspect-ratio:16/10;object-fit:cover;width:100%}
.card .b{padding:15px 17px 18px}
.card h3{margin:0 0 6px;font-size:1.06rem}
.card h3 a{text-decoration:none}
.card p{margin:0;font-size:.9rem;color:var(--muted)}
.pill{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  color:var(--sea-700);background:var(--sky);border-radius:999px;padding:3px 9px;margin-bottom:8px}

/* related */
.related{background:var(--sky);border-top:1px solid var(--line);padding:36px 0 42px}
.related h2{margin:0 0 4px;font-size:1.4rem}
.related .grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;margin-top:16px}
.related a{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 15px;
  text-decoration:none;font-weight:500;font-size:.93rem;color:var(--sea-900)}
.related a:hover{border-color:var(--sea-500);color:var(--sea-700)}

/* footer */
footer{background:var(--sea-900);color:#c6e3ea;padding:44px 0 26px;font-size:.9rem}
footer h4{color:#fff;font-size:.95rem;margin:0 0 10px}
footer a{color:#c6e3ea;text-decoration:none}
footer a:hover{color:#fff;text-decoration:underline}
.fgrid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:28px}
@media(max-width:820px){.fgrid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.fgrid{grid-template-columns:1fr}}
footer ul{list-style:none;margin:0;padding:0}
footer li{margin:5px 0}
.legal{border-top:1px solid rgba(255,255,255,.15);margin-top:30px;padding-top:16px;
  display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;font-size:.83rem}

/* to top */
#totop{position:fixed;right:18px;bottom:18px;z-index:80;width:46px;height:46px;border:none;border-radius:50%;
  background:var(--sea-900);color:#fff;font-size:20px;cursor:pointer;box-shadow:var(--shadow);
  opacity:0;visibility:hidden;transition:opacity .25s,visibility .25s,background .2s}
#totop.on{opacity:1;visibility:visible}
#totop:hover{background:var(--sun)}
form.contact{display:grid;gap:12px;max-width:520px}
form.contact label{font-weight:600;font-size:.9rem}
form.contact input,form.contact textarea{width:100%;padding:10px 12px;border:1px solid var(--line);
  border-radius:10px;font:inherit;font-size:.95rem}
form.contact button{justify-self:start;background:var(--sea-900);color:#fff;border:none;border-radius:999px;
  padding:11px 26px;font:inherit;font-weight:600;cursor:pointer}
form.contact button:hover{background:var(--sun)}