:root{--bg:#f6f7f9;--card:#fff;--ink:#1d2430;--muted:#5d6878;--line:#dfe3ea;--acc:#1f5fa8;--acc2:#e9f0f9}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.6 -apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--acc);text-decoration:none}a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
header{background:var(--card);border-bottom:1px solid var(--line)}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.logo{font-weight:700;font-size:19px;color:var(--ink);letter-spacing:.2px}.logo span{color:var(--acc)}
nav a{color:var(--muted);margin-left:22px;font-size:15px}nav a.btn{color:#fff}
.btn{display:inline-block;background:var(--acc);color:#fff;padding:9px 18px;border-radius:6px;font-weight:600;border:0;cursor:pointer;font-size:15px}
.btn:hover{text-decoration:none;filter:brightness(1.08)}
.hero{padding:72px 0 56px;background:linear-gradient(180deg,#fff,var(--bg))}
.hero h1{font-size:38px;line-height:1.2;margin:0 0 16px;max-width:760px}
.hero p{font-size:18px;color:var(--muted);max-width:680px;margin:0 0 28px}
section{padding:48px 0}h2{font-size:26px;margin:0 0 24px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:22px}
.card h3{margin:0 0 8px;font-size:18px}.card p{margin:0;color:var(--muted);font-size:15px}
.stats{display:flex;flex-wrap:wrap;gap:40px;margin-top:8px}.stats b{display:block;font-size:30px;color:var(--acc)}.stats span{color:var(--muted);font-size:14px}
.tags{display:flex;flex-wrap:wrap;gap:10px}.tags span{background:var(--acc2);color:var(--acc);padding:6px 12px;border-radius:20px;font-size:14px}
footer{border-top:1px solid var(--line);background:var(--card);padding:28px 0;color:var(--muted);font-size:14px}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
.login{min-height:calc(100vh - 64px - 86px);display:flex;align-items:center;justify-content:center;padding:40px 16px}
.login form{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:32px;width:100%;max-width:380px}
.login h1{font-size:22px;margin:0 0 4px}.login .sub{color:var(--muted);font-size:14px;margin:0 0 24px}
label{display:block;font-size:14px;font-weight:600;margin:0 0 6px}
input{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:6px;font:inherit;margin:0 0 16px}
input:focus{outline:2px solid var(--acc);outline-offset:0;border-color:var(--acc)}
.login .btn{width:100%;padding:11px}
.err{display:none;background:#fdecec;color:#a12626;border:1px solid #f3c4c4;border-radius:6px;padding:10px 12px;font-size:14px;margin:0 0 16px}
.err.on{display:block}.note{font-size:13px;color:var(--muted);margin:16px 0 0}
@media(max-width:640px){nav a:not(.btn){display:none}.hero{padding:44px 0 32px}.hero h1{font-size:28px}}

.hero-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:40px;align-items:center}
.hero-img{width:100%;height:auto;display:block}
.card .ic{display:block;margin:0 0 14px}
.arch{width:100%;height:auto;display:block;margin:0 0 20px}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr}.hero h1{font-size:32px}}
#how{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
@media(max-width:640px){.arch{display:none}}