:root{--ink:#102c45;--muted:#496984;--paper:#f6fbfa;--card:#fff;--line:#c9dce3;--teal:#087f78;--teal-2:#dff6ef;--navy:#12324c;--orange:#f08a35;--shadow:0 16px 40px rgba(16,44,69,.09)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.7 system-ui,-apple-system,"Segoe UI",sans-serif}
a{color:var(--teal);font-weight:700;text-decoration:none}
a:hover{text-decoration:underline}
.site-head{position:sticky;top:0;z-index:10;background:rgba(246,251,250,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}
.nav{width:min(1180px,calc(100% - 32px));min-height:76px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink);white-space:nowrap}
.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:13px;background:var(--navy);color:#fff;font-weight:900}
.brand small{display:block;color:var(--muted);font-weight:500;font-size:.72rem;line-height:1.2}
.navlinks{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px}
.navlinks a{padding:8px 10px;color:var(--ink);font-size:.9rem}
.navlinks a:hover,.navlinks a[aria-current=page]{background:var(--teal-2);border-radius:999px;text-decoration:none}
.container{width:min(1180px,calc(100% - 32px));margin:0 auto}
.hero{margin:42px auto 28px;display:grid;grid-template-columns:1.2fr .8fr;gap:30px;align-items:stretch}
.hero-copy,.hero-card,.section,.article,.side-card{background:var(--card);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow)}
.hero-copy{padding:48px;background:linear-gradient(135deg,#0f3855,#146b71);color:white}
.eyebrow{color:#09a89c;text-transform:uppercase;letter-spacing:.14em;font-size:.75rem;font-weight:900}
.hero-copy .eyebrow{color:#8ff4df}
h1,h2,h3{line-height:1.12;margin:0 0 16px;letter-spacing:-.025em}
h1{font-size:clamp(2.45rem,6vw,5.3rem)}
h2{font-size:clamp(1.8rem,3vw,3rem)}
h3{font-size:1.35rem}
.hero-copy p{max-width:760px;font-size:1.08rem}
.hero-card{padding:30px;display:flex;flex-direction:column;justify-content:center;background:#e6f6f1}
.metric-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:20px}
.metric,.tag{border:1px solid var(--line);border-radius:14px;padding:12px;background:#fff}
.metric strong{display:block;font-size:1.6rem;color:var(--teal)}
.buttons{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.button{display:inline-block;padding:10px 16px;border-radius:11px;background:var(--orange);color:#1c2630;border:0;font-weight:900}
.button.alt{background:#fff;color:var(--teal);border:1px solid var(--line)}
.section{padding:32px;margin:30px 0}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:20px}
.section-head p{max-width:560px;margin:0;color:var(--muted)}
.roadmap,.cards,.formula-grid,.catalog{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px}
.card h3{margin-bottom:8px}
.card p{margin:6px 0;color:var(--muted)}
.card ul{margin:12px 0 0;padding-left:20px}
.level{border-top:5px solid var(--teal)}
.level.basic{border-top-color:#38a169}.level.intermediate{border-top-color:#d59627}.level.advanced{border-top-color:#d34c55}
.level.special{border-top-color:#7c5cff}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:28px;align-items:start}
.article{padding:36px;min-width:0}
.article p{max-width:860px}
.article h2{margin-top:38px;padding-top:12px;border-top:1px solid var(--line)}
.article h3{margin-top:24px}
.side-card{padding:22px;position:sticky;top:98px}
.side-card ul{list-style:none;padding:0;margin:8px 0}.side-card li{border-bottom:1px solid var(--line);padding:8px 0}
.ad{min-height:72px;border:1px dashed #93c3c8;display:grid;place-items:center;color:#6b9ca0;text-transform:uppercase;letter-spacing:.18em;font-size:.7rem;margin:24px 0}
.diagram,.code{overflow:auto;max-width:100%;white-space:pre;display:block;border-radius:12px;padding:18px;background:#102d43;color:#effffc;font:14px/1.55 ui-monospace,SFMono-Regular,Consolas,monospace}
.diagram.light{background:#edf8f5;color:var(--ink);border:1px solid var(--line)}
.callout{border-left:5px solid var(--orange);background:#fff2e8;padding:16px 18px;margin:20px 0}
.callout.good{border-color:var(--teal);background:var(--teal-2)}
.table-wrap{overflow-x:auto;margin:18px 0;border:1px solid var(--line);border-radius:12px}
.table{width:100%;min-width:620px;border-collapse:collapse;background:#fff}
.table th,.table td{border-bottom:1px solid var(--line);padding:11px 12px;text-align:left;vertical-align:top;overflow-wrap:anywhere}
.table th{background:#e8f7f2;color:var(--ink)}
.table code{white-space:normal;overflow-wrap:anywhere;word-break:break-word}
.criteria-table{table-layout:fixed;min-width:0}
.criteria-table th:first-child{width:25%}.criteria-table th:last-child{width:75%}
.formula-grid{grid-template-columns:repeat(2,1fr)}
.formula{border:1px solid var(--line);border-radius:14px;padding:16px;background:#fff}
.formula code{display:block;padding:10px;border-radius:8px;background:#102d43;color:#baffee;white-space:pre-wrap;overflow-wrap:anywhere}
.formula p{margin:8px 0 0;color:var(--muted)}
.search{width:100%;padding:13px 15px;border:1px solid var(--line);border-radius:10px;font:inherit}
.filters{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}.filter{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:999px;padding:7px 11px;cursor:pointer;font-weight:700}.filter.active{background:var(--teal);color:white}
details{border:1px solid var(--line);border-radius:12px;background:#fff;margin:12px 0;padding:12px 16px}summary{cursor:pointer;font-weight:900}
.footer{padding:38px 0 55px;border-top:1px solid var(--line);margin-top:48px;color:var(--muted)}
.footer .navlinks{justify-content:flex-start}
.mini-note{padding:14px 16px;border-radius:10px;background:#eef8f4;color:var(--muted)}
@media(max-width:900px){.hero{grid-template-columns:1fr}.layout{grid-template-columns:1fr}.side-card{position:static}.roadmap,.cards,.catalog{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.nav{align-items:flex-start;padding:12px 0;flex-direction:column}.navlinks{justify-content:flex-start}.navlinks a{padding:5px 7px;font-size:.78rem}.container{width:min(100% - 20px,1180px)}.hero-copy,.hero-card,.article,.section{padding:22px;border-radius:17px}.roadmap,.cards,.catalog,.formula-grid{grid-template-columns:1fr}.metric-grid{grid-template-columns:1fr 1fr}.article h2{font-size:1.7rem}.table{min-width:0;font-size:.82rem}.criteria-table th:first-child{width:31%}.criteria-table th:last-child{width:69%}}