:root{--bg:#f6f7f9;--surface:#fff;--ink:#17202a;--muted:#64707d;--line:#e3e7eb;--accent:#3457d5;--accent2:#edf1ff;--good:#087f5b;--shadow:0 12px 36px rgba(20,30,50,.08);--radius:18px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.55}
a{color:inherit}.wrap{width:min(1120px,calc(100% - 32px));margin:auto}.topbar{position:sticky;top:0;z-index:20;background:rgba(246,247,249,.92);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.nav{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{font-weight:800;text-decoration:none;font-size:1.05rem;letter-spacing:-.02em}.brand span{color:var(--accent)}
.navlinks{display:flex;gap:6px;align-items:center}.navlinks a{padding:9px 12px;border-radius:10px;text-decoration:none;color:var(--muted);font-size:.92rem}.navlinks a:hover,.navlinks a.active{background:var(--surface);color:var(--ink);box-shadow:0 2px 10px rgba(0,0,0,.04)}
.hero{padding:88px 0 72px}.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:60px;align-items:center}.eyebrow{font-size:.78rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:16px}.hero h1{font-size:clamp(2.7rem,7vw,5.6rem);line-height:.96;letter-spacing:-.065em;margin:0 0 24px;max-width:850px}.hero p.lead{font-size:1.2rem;color:var(--muted);max-width:650px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}.btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:12px 17px;text-decoration:none;font-weight:750;cursor:pointer;font:inherit}.btn.primary{background:var(--ink);border-color:var(--ink);color:#fff}.btn.accent{background:var(--accent);border-color:var(--accent);color:#fff}.btn:hover{transform:translateY(-1px)}
.demo{background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:var(--shadow)}.demo-line{padding:15px 0;border-bottom:1px solid var(--line);font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.demo-line:last-child{border-bottom:0}.shortcut{color:var(--accent);font-weight:800}.arrow{color:#9aa3ad;margin:0 9px}.expanded{font-family:inherit;color:var(--ink)}
.section{padding:72px 0}.section.alt{background:#fff}.section h2{font-size:clamp(2rem,4vw,3.2rem);line-height:1.05;letter-spacing:-.045em;margin:0 0 14px}.section-intro{color:var(--muted);max-width:700px;margin:0 0 32px}.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px}.card h3{margin:0 0 6px;font-size:1rem}.card p{margin:0;color:var(--muted);font-size:.9rem}.count{display:inline-block;margin-top:16px;font-size:.78rem;font-weight:800;color:var(--accent)}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.feature{padding:28px;border:1px solid var(--line);border-radius:var(--radius);background:#fff}.feature b{display:block;margin-bottom:7px}.feature p{margin:0;color:var(--muted)}
.cta{background:var(--ink);color:#fff;border-radius:28px;padding:46px}.cta p{color:#c5ccd4;max-width:650px}.cta .btn{background:#fff;color:var(--ink);border-color:#fff}
.pagehead{padding:58px 0 30px}.pagehead h1{font-size:clamp(2.2rem,5vw,4rem);letter-spacing:-.055em;line-height:1;margin:0 0 14px}.pagehead p{color:var(--muted);max-width:760px}
.panel{background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px;box-shadow:var(--shadow)}.toolbar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:18px}.input,.select{border:1px solid var(--line);border-radius:11px;padding:11px 13px;background:#fff;font:inherit}.input{min-width:280px;flex:1}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:15px}.ref-table{width:100%;border-collapse:collapse;min-width:760px}.ref-table th,.ref-table td{text-align:left;padding:13px 15px;border-bottom:1px solid var(--line);vertical-align:top}.ref-table th{background:#f8f9fb;font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}.ref-table tr:last-child td{border-bottom:0}.mono{font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.save{font-weight:800;color:var(--good);white-space:nowrap}
.pagination{display:flex;justify-content:center;gap:6px;flex-wrap:wrap;margin-top:24px}.pagination a,.pagination span{padding:8px 11px;border:1px solid var(--line);border-radius:9px;text-decoration:none;background:#fff;font-size:.9rem}.pagination .current{background:var(--ink);color:#fff;border-color:var(--ink)}
.builder-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:20px}.drop{border:2px dashed #cbd2db;border-radius:18px;padding:35px;text-align:center;background:#fafbfc}.drop.drag{border-color:var(--accent);background:var(--accent2)}.drop input{display:none}.drop label{cursor:pointer}.checkgrid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.check{display:flex;gap:10px;padding:12px;border:1px solid var(--line);border-radius:12px;background:#fff}.check small{display:block;color:var(--muted)}.notice{padding:14px 16px;border-radius:12px;background:#fff8e6;border:1px solid #f1d58a;color:#684d00}.status{padding:14px;border-radius:12px;background:#f1f4f8;margin-top:15px}.hidden{display:none!important}
.test-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.prompt{font-size:1.06rem;line-height:1.8;background:#fafbfc;border:1px solid var(--line);padding:20px;border-radius:15px}.textarea{width:100%;min-height:260px;resize:vertical;border:1px solid var(--line);border-radius:15px;padding:16px;font:inherit;line-height:1.7}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:16px}.stat{padding:16px;background:#fff;border:1px solid var(--line);border-radius:14px}.stat strong{display:block;font-size:1.4rem}.stat span{font-size:.78rem;color:var(--muted)}
footer{padding:42px 0;color:var(--muted);font-size:.85rem;border-top:1px solid var(--line)}footer .foot{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
@media(max-width:900px){.hero-grid,.builder-grid,.test-grid{grid-template-columns:1fr}.cards{grid-template-columns:repeat(2,1fr)}.feature-grid{grid-template-columns:1fr 1fr}.hero{padding-top:55px}}
@media(max-width:620px){.wrap{width:min(100% - 22px,1120px)}.nav{min-height:60px}.navlinks a{font-size:.8rem;padding:7px 8px}.navlinks a:nth-child(n+4){display:none}.hero h1{font-size:3rem}.cards,.feature-grid,.checkgrid,.stats{grid-template-columns:1fr}.section{padding:52px 0}.cta{padding:30px 22px}}
@media(prefers-color-scheme:dark){:root{--bg:#111418;--surface:#191d22;--ink:#f4f6f8;--muted:#a6afb9;--line:#2b323a;--accent:#91a6ff;--accent2:#1b2340;--good:#58d4aa;--shadow:0 12px 36px rgba(0,0,0,.25)}.topbar{background:rgba(17,20,24,.92)}.section.alt,.feature,.panel,.demo,.card,.btn,.input,.select,.pagination a,.pagination span,.stat,.drop{background:var(--surface)}.ref-table th{background:#20252b}.prompt,.status{background:#15191d}.notice{background:#332b13;color:#f2d77b;border-color:#66551e}}

/* v1.4 visual refinement */
.brand{font-size:1.28rem;letter-spacing:-.04em}.brand span{font-weight:900}.topbar{box-shadow:0 4px 20px rgba(20,30,50,.045)}
.navlinks a{font-weight:650}.hero{padding-top:96px}.demo{border-top:3px solid var(--accent)}.card,.feature,.panel{transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}.card:hover,.feature:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:#cbd4e5}.btn{transition:transform .16s ease,box-shadow .16s ease}.btn:hover{box-shadow:0 8px 22px rgba(20,30,50,.12)}
@media(max-width:620px){.brand{font-size:1.12rem}.navlinks{gap:2px}.navlinks a{padding:7px 6px}.hero{padding-top:62px}}