:root{color-scheme:dark;--bg:#070d18;--card:#111d30;--ink:#edf7ff;--muted:#a3b5c8;--line:#26384b;--cyan:#47d9e6;--purple:#a66cff}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font:16px/1.75 system-ui,-apple-system,Segoe UI,sans-serif;background:radial-gradient(ellipse at 20% 0%,#142342 0%,transparent 52%),var(--bg);color:var(--ink)}a{color:#72e8f1}a:hover{color:white}header{position:sticky;top:0;background:#07101df2;backdrop-filter:blur(14px);z-index:9;border-bottom:1px solid var(--line)}.nav{max-width:1160px;margin:auto;padding:13px 20px;display:flex;align-items:center;gap:22px;justify-content:space-between}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:800;color:#fff}.brand img{height:39px;width:39px;object-fit:contain}.brand span{background:linear-gradient(90deg,#43e7ef,#b06df6);color:transparent;background-clip:text}.navlinks{display:flex;gap:22px;align-items:center;flex-wrap:wrap}.navlinks a{text-decoration:none;color:var(--muted);font-size:14px}.navlinks a:hover{color:#fff}.cta{background:linear-gradient(100deg,#079aba,#8546df);color:#fff!important;padding:10px 18px;border-radius:999px;text-decoration:none;font-weight:700;display:inline-block}.wrap{max-width:1160px;margin:auto;padding:0 20px}.hero{padding:72px 0 44px}.eyebrow{text-transform:uppercase;letter-spacing:.17em;color:var(--cyan);font-weight:800;font-size:12px}.hero h1{font-size:clamp(2.3rem,5vw,4.7rem);line-height:1.11;letter-spacing:-.045em;margin:12px 0 17px;max-width:900px}.lead{font-size:1.12rem;max-width:750px;color:var(--muted)}.filters{display:flex;gap:8px;flex-wrap:wrap;margin:24px 0}.filter{background:#142338;border:1px solid #31465a;color:#dcecff;padding:8px 13px;border-radius:999px;cursor:pointer;font:inherit;font-size:13px}.filter[aria-pressed=true]{background:#174b63;border-color:#50daea}.search{width:min(100%,480px);border-radius:12px;background:#102033;border:1px solid #365269;color:white;padding:13px 17px;font:inherit}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin:22px 0 64px}.tile{background:linear-gradient(155deg,#162842,#0d1727);border:1px solid #294359;border-radius:19px;padding:22px;display:flex;flex-direction:column;min-height:255px;transition:border-color .2s,transform .2s}.tile:hover{border-color:#47d9e6;transform:translateY(-2px)}.tile .cat{font-size:11px;letter-spacing:.1em;color:#65e5ef;text-transform:uppercase;font-weight:750}.tile h2{font-size:1.3rem;line-height:1.3;margin:12px 0}.tile p{color:var(--muted);font-size:14px;margin:0 0 18px}.tile a{margin-top:auto;font-weight:700;text-decoration:none}.feature{background:linear-gradient(120deg,#0c4561,#32215b);border:1px solid #426787;border-radius:22px;padding:24px;margin:0 0 40px;display:flex;align-items:center;justify-content:space-between;gap:20px}.feature h2{margin:0 0 8px}.feature p{margin:0;color:#d7e6f5}.feature .cta{white-space:nowrap}.article{max-width:840px;margin:0 auto;padding:52px 20px 76px}.article h1{font-size:clamp(2rem,4.8vw,3.8rem);line-height:1.14;margin:12px 0}.article h2{line-height:1.25;font-size:1.7rem;margin-top:38px}.article p,.article li{color:#cfdae5}.article ul{padding-left:22px}.meta{color:var(--muted);font-size:13px}.note{background:#132840;border-left:3px solid #53dbdf;padding:16px 20px;border-radius:9px}.breadcrumb{font-size:13px;color:var(--muted)}.article .feature{margin:35px 0}.related{border-top:1px solid var(--line);padding-top:22px}.related a{display:inline-block;margin:6px 15px 6px 0}.calc{background:#111f34;border:1px solid #31506e;padding:24px;border-radius:20px;max-width:740px}.calc label{display:block;font-weight:700;margin-bottom:6px}.calc select,.calc input{width:100%;padding:12px;border-radius:10px;border:1px solid #42617a;background:#09182a;color:white;font:inherit}.calc .field{margin-bottom:22px}.calc output{font-size:2rem;font-weight:800;color:#61e6e8}.small{font-size:13px;color:var(--muted)}footer{border-top:1px solid var(--line);padding:28px 20px;color:var(--muted);text-align:center;font-size:13px}footer a{margin:0 8px}.hidden{display:none!important}@media(max-width:850px){.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.feature{align-items:flex-start;flex-direction:column}}@media(max-width:530px){.nav{gap:8px;padding:10px 12px}.navlinks{gap:10px}.navlinks a{font-size:12px}.brand img{width:32px;height:32px}.brand span{font-size:12px}.navlinks .cta{padding:7px 9px}.hero{padding:46px 0 22px}.grid{grid-template-columns:1fr;gap:12px}.tile{min-height:205px}.article{padding-top:36px}.feature{padding:18px}.calc{padding:16px}}

/* Related reading navigation: accessible, clean and consistent with premium cards */
.ydg-topic-links{margin-top:30px;padding:24px;border:1px solid var(--line);border-radius:18px;background:linear-gradient(145deg,#101f35,#0a1728)}
.ydg-topic-links h2{margin:0 0 16px;font-size:1.35rem}
.ydg-topic-links ul{list-style:none;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:0 0 14px;padding:0}
.ydg-topic-links li{margin:0;padding:0}
.ydg-topic-links li a{display:block;text-decoration:none;background:#152b41;border:1px solid #2d4b61;border-radius:12px;padding:12px 14px;height:100%;font-size:14px;font-weight:650;color:#d9f5fb;line-height:1.45}
.ydg-topic-links li a:hover,.ydg-topic-links li a:focus-visible{border-color:#55cbdc;color:white;outline-offset:3px}
.ydg-topic-links>p{margin:13px 0 0;font-size:13px}
@media(max-width:540px){.ydg-topic-links{padding:16px}.ydg-topic-links ul{grid-template-columns:1fr}}