:root{--ink:#0d1b2a;--ink-2:#33475b;--muted:#5f7387;--line:#dfe6ee;--bg:#ffffff;--bg-2:#f4f7fa;--navy:#0b2540;--navy-2:#123a5e;--accent:#0fa3a3;--accent-2:#0b7f80;--accent-soft:#e2f5f5;--warn:#b4540a;--warn-soft:#fdf1e6;--radius:14px;--max:1160px;--read:740px;--font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;}*{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:1.65;font-size:17px}img,svg{max-width:100%}a{color:var(--accent-2);text-decoration-thickness:1px;text-underline-offset:3px}a:hover{color:var(--navy-2)}.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px 12px;z-index:99}/* header */.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:66px;gap:16px}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--navy);font-weight:750;font-size:1.12rem;letter-spacing:-.01em}.brand svg{width:34px;height:34px;flex:none}.brand small{display:block;font-weight:500;font-size:.72rem;color:var(--muted);letter-spacing:.02em;margin-top:-3px}.nav{display:flex;gap:4px;align-items:center}.nav a{color:var(--ink-2);text-decoration:none;font-size:.95rem;font-weight:550;padding:8px 12px;border-radius:9px}.nav a:hover,.nav a[aria-current=page]{background:var(--bg-2);color:var(--navy)}.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:9px;padding:8px 10px;font:inherit;color:var(--ink)}@media (max-width:860px){.nav-toggle{display:block}.nav{display:none;position:absolute;top:66px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:10px 16px 16px}.nav.open{display:flex}}/* hero */.hero{background:radial-gradient(1200px 420px at 85% -10%,rgba(15,163,163,.35),transparent 60%),linear-gradient(160deg,var(--navy),#06192d 70%);color:#eaf2f8;padding:84px 0 76px;position:relative;overflow:hidden}.hero h1{font-size:clamp(2.1rem,4.6vw,3.4rem);line-height:1.08;letter-spacing:-.025em;margin:0 0 18px;max-width:820px;color:#fff}.hero p.lede{font-size:1.18rem;max-width:660px;color:#bcd0e0;margin:0 0 30px}.hero .wave{position:absolute;right:-40px;bottom:-10px;width:560px;opacity:.22;pointer-events:none}.eyebrow{display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:14px}.hero .eyebrow{color:#5fd6d6}.btns{display:flex;gap:12px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 20px;border-radius:11px;font-weight:650;text-decoration:none;font-size:.98rem;border:1px solid transparent}.btn-primary{background:var(--accent);color:#04201f}.btn-primary:hover{background:#2cc0c0;color:#04201f}.btn-ghost{border-color:rgba(255,255,255,.28);color:#fff}.btn-ghost:hover{background:rgba(255,255,255,.08);color:#fff}.btn-line{border-color:var(--line);color:var(--navy);background:#fff}.btn-line:hover{border-color:var(--accent);color:var(--accent-2)}/* sections */section.block{padding:70px 0}section.alt{background:var(--bg-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:30px;flex-wrap:wrap}.section-head h2{font-size:clamp(1.5rem,2.6vw,2.05rem);letter-spacing:-.02em;margin:0;line-height:1.15}.section-head p{margin:6px 0 0;color:var(--muted);max-width:620px}/* cards */.grid{display:grid;gap:22px}.g3{grid-template-columns:repeat(3,1fr)}.g2{grid-template-columns:repeat(2,1fr)}.g4{grid-template-columns:repeat(4,1fr)}@media (max-width:980px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}@media (max-width:640px){.g3,.g2,.g4{grid-template-columns:1fr}}.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;display:flex;flex-direction:column;transition:border-color .15s,box-shadow .15s,transform .15s;text-decoration:none;color:inherit}a.card:hover{border-color:#b9cfe0;box-shadow:0 10px 28px -14px rgba(11,37,64,.28);transform:translateY(-2px);color:inherit}.card h3{font-size:1.17rem;line-height:1.3;margin:8px 0 8px;letter-spacing:-.01em;color:var(--navy)}.card p{margin:0;color:var(--ink-2);font-size:.97rem}.card .meta{margin-top:auto;padding-top:16px;font-size:.84rem;color:var(--muted)}.tag{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent-2);background:var(--accent-soft);padding:4px 9px;border-radius:999px;align-self:flex-start}.tag.warn{color:var(--warn);background:var(--warn-soft)}.card.feature{grid-column:span 2;background:linear-gradient(140deg,#fff,#f1f8f8)}@media (max-width:980px){.card.feature{grid-column:span 2}}@media (max-width:640px){.card.feature{grid-column:span 1}}.card.feature h3{font-size:1.55rem}.icon{width:42px;height:42px;border-radius:11px;background:var(--accent-soft);display:grid;place-items:center;color:var(--accent-2);margin-bottom:6px}.icon svg{width:22px;height:22px}/* stats strip */.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}.stats div{padding:22px;border-right:1px solid var(--line)}.stats div:last-child{border-right:0}.stats b{display:block;font-size:1.6rem;color:var(--navy);letter-spacing:-.02em}.stats span{font-size:.88rem;color:var(--muted)}@media (max-width:760px){.stats{grid-template-columns:1fr 1fr}.stats div:nth-child(2){border-right:0}.stats div:nth-child(-n+2){border-bottom:1px solid var(--line)}}/* article */.page-head{background:var(--bg-2);border-bottom:1px solid var(--line);padding:54px 0 40px}.page-head h1{font-size:clamp(1.9rem,3.8vw,2.8rem);line-height:1.12;letter-spacing:-.025em;margin:6px 0 14px;max-width:880px;color:var(--navy)}.page-head .lede{font-size:1.15rem;color:var(--ink-2);max-width:760px;margin:0}.byline{margin-top:18px;font-size:.88rem;color:var(--muted);display:flex;gap:14px;flex-wrap:wrap}.crumbs{font-size:.85rem;color:var(--muted)}.crumbs a{color:var(--muted)}.article-layout{display:grid;grid-template-columns:minmax(0,var(--read)) 280px;gap:56px;padding:48px 0 70px;justify-content:space-between}@media (max-width:1020px){.article-layout{grid-template-columns:1fr}.toc{display:none}}.prose h2{font-size:1.55rem;letter-spacing:-.015em;margin:2.2em 0 .6em;color:var(--navy);line-height:1.25;scroll-margin-top:84px}.prose h3{font-size:1.2rem;margin:1.8em 0 .4em;color:var(--navy);scroll-margin-top:84px}.prose p,.prose li{color:#1d2f42}.prose ul,.prose ol{padding-left:1.3em}.prose li{margin:.35em 0}.prose > :first-child{margin-top:0}.prose code{font-family:var(--mono);font-size:.88em;background:var(--bg-2);border:1px solid var(--line);padding:1px 6px;border-radius:6px}.prose pre{background:#0b1d30;color:#d7e6f3;padding:18px 20px;border-radius:12px;overflow:auto;font-size:.88rem;line-height:1.55}.prose pre code{background:none;border:0;padding:0;color:inherit}.prose table{width:100%;border-collapse:collapse;margin:1.4em 0;font-size:.94rem;display:block;overflow-x:auto}.prose th,.prose td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}.prose th{background:var(--bg-2);font-weight:650;color:var(--navy);white-space:nowrap}.callout{border:1px solid #bfe5e5;background:var(--accent-soft);border-radius:12px;padding:16px 20px;margin:1.6em 0}.callout.warn{border-color:#f2cfae;background:var(--warn-soft)}.callout strong:first-child{display:block;color:var(--navy);margin-bottom:4px}.callout p{margin:.3em 0}.keypoints{border-left:4px solid var(--accent);padding:6px 0 6px 20px;margin:0 0 2em}.keypoints h2{margin:0 0 .4em!important;font-size:1.05rem!important;text-transform:uppercase;letter-spacing:.08em;color:var(--accent-2)!important}.keypoints ul{margin:0}.toc{position:sticky;top:92px;align-self:start;font-size:.92rem}.toc h4{font-size:.75rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 10px}.toc ol{list-style:none;padding:0;margin:0;border-left:2px solid var(--line)}.toc li a{display:block;padding:5px 0 5px 14px;color:var(--ink-2);text-decoration:none;margin-left:-2px;border-left:2px solid transparent}.toc li a:hover{color:var(--accent-2);border-left-color:var(--accent)}.toc .side-card{margin-top:28px;border:1px solid var(--line);border-radius:12px;padding:16px;background:var(--bg-2)}.toc .side-card p{margin:.3em 0 .8em;color:var(--ink-2)}.related{border-top:1px solid var(--line);padding:50px 0 70px}.sources{font-size:.9rem;color:var(--muted);border-top:1px solid var(--line);margin-top:3em;padding-top:1.2em}.sources h2{font-size:1rem!important;margin:0 0 .5em!important}.sources li{color:var(--muted)}/* comparison */.compare{width:100%;border-collapse:separate;border-spacing:0;font-size:.94rem;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.compare th,.compare td{padding:13px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.compare thead th{background:var(--navy);color:#fff;font-weight:650}.compare tbody th{background:var(--bg-2);color:var(--navy);width:180px}.compare tr:last-child td,.compare tr:last-child th{border-bottom:0}.table-scroll{overflow-x:auto}.dots{letter-spacing:2px;color:var(--accent-2);white-space:nowrap}.dots i{font-style:normal;color:#c8d3de}/* option cards */.option{border:1px solid var(--line);border-radius:var(--radius);padding:28px;background:#fff;scroll-margin-top:84px}.option h3{margin:6px 0 6px;font-size:1.4rem;color:var(--navy)}.option .pc{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:14px}.option .pc h4{margin:0 0 4px;font-size:.8rem;letter-spacing:.1em;text-transform:uppercase}.option .pc .pro h4{color:var(--accent-2)}.option .pc .con h4{color:var(--warn)}.option ul{margin:0;padding-left:1.15em;font-size:.95rem}.option .best{margin-top:16px;padding:12px 14px;background:var(--bg-2);border-radius:10px;font-size:.95rem}@media (max-width:640px){.option .pc{grid-template-columns:1fr}}/* tool */.tool{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:28px}.tool .row{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}@media (max-width:820px){.tool .row{grid-template-columns:1fr 1fr}}.tool label{display:block;font-size:.84rem;font-weight:650;color:var(--ink-2);margin-bottom:6px}.tool select,.tool input{width:100%;padding:11px 12px;border:1px solid #c9d5e1;border-radius:10px;font:inherit;background:#fff;color:var(--ink)}.tool select:focus,.tool input:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}.result{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:22px}.result div{background:var(--bg-2);border-radius:12px;padding:18px}.result b{display:block;font-size:1.7rem;color:var(--navy);letter-spacing:-.02em}.result span{font-size:.86rem;color:var(--muted)}@media (max-width:640px){.result{grid-template-columns:1fr}}.verdict{margin-top:16px;padding:14px 16px;border-radius:12px;font-weight:550}.verdict.ok{background:var(--accent-soft);color:#075e5f}.verdict.bad{background:var(--warn-soft);color:#7a3806}/* glossary */.gloss dt{font-weight:700;color:var(--navy);margin-top:1.3em;scroll-margin-top:84px}.gloss dd{margin:.25em 0 0;color:var(--ink-2)}.az{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:20px}.az a{display:inline-grid;place-items:center;width:34px;height:34px;border:1px solid var(--line);border-radius:8px;text-decoration:none;font-weight:650;color:var(--navy)}.az a:hover{border-color:var(--accent);color:var(--accent-2)}/* checklist */.checklist{list-style:none;padding:0!important}.checklist li{padding-left:30px;position:relative}.checklist li::before{content:"";position:absolute;left:0;top:.35em;width:18px;height:18px;border-radius:5px;border:2px solid var(--accent);background:#fff}/* cta */.cta{background:linear-gradient(140deg,var(--navy),var(--navy-2));color:#dbe8f3;border-radius:20px;padding:40px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}.cta h2{color:#fff;margin:0 0 6px;font-size:1.6rem;letter-spacing:-.015em}.cta p{margin:0;max-width:600px}/* footer */.site-footer{background:#07182a;color:#9fb4c7;padding:56px 0 30px;font-size:.93rem}.site-footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px}@media (max-width:760px){.site-footer .cols{grid-template-columns:1fr 1fr}}.site-footer h4{color:#fff;font-size:.8rem;letter-spacing:.12em;text-transform:uppercase;margin:0 0 12px}.site-footer ul{list-style:none;padding:0;margin:0}.site-footer li{margin:7px 0}.site-footer a{color:#c9d8e6;text-decoration:none}.site-footer a:hover{color:#5fd6d6}.site-footer .brand{color:#fff}.site-footer .legal{border-top:1px solid #17304a;margin-top:40px;padding-top:20px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:.85rem}@media (max-width:760px){.stats b{font-size:1.2rem}.stats div{padding:16px}.stats span{line-height:1.45;display:block}}