:root{
  --bg:#f7f9fc;--surface:#ffffff;--text:#0f172a;--muted:#5b6b82;--border:#e3e9f2;
  --primary:#0b8a5a;--primary-d:#086c47;--accent:#0ea5e9;--danger:#dc2626;--shadow:0 8px 30px rgba(15,23,42,.08);
}
[data-theme="dark"]{
  --bg:#0b1220;--surface:#121b2e;--text:#e7eefb;--muted:#9fb0c9;--border:#22304a;
  --primary:#19c37d;--primary-d:#13a268;--accent:#38bdf8;--shadow:0 8px 30px rgba(0,0,0,.45);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
a{color:inherit;text-decoration:none}
.nav{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;position:sticky;top:0;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);z-index:20}
.brand{font-size:1.25rem}.brand .logo{margin-right:6px}
.nav nav{display:flex;gap:18px;align-items:center}
.nav nav a{color:var(--muted);font-weight:500}
.theme-btn{background:none;border:1px solid var(--border);border-radius:10px;padding:6px 10px;cursor:pointer;font-size:1rem}
main{max-width:920px;margin:0 auto;padding:0 20px}
.hero{text-align:center;padding:56px 0 24px}
.hero h1{font-size:clamp(2rem,5vw,3.1rem);line-height:1.1;margin:0 0 14px}
.hero .sub{font-size:1.15rem;color:var(--muted);max-width:680px;margin:0 auto}
.stats{display:flex;gap:18px;justify-content:center;flex-wrap:wrap;margin-top:22px}
.stats div{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:12px 18px;box-shadow:var(--shadow)}
.stats b{display:block;font-size:1.3rem;color:var(--primary)}
.card{background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:22px;box-shadow:var(--shadow)}
.lbl{font-weight:600;display:block;margin-bottom:8px}
textarea{width:100%;border:1px solid var(--border);border-radius:12px;padding:14px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.95rem;background:var(--bg);color:var(--text);resize:vertical}
.row{display:flex;gap:12px;align-items:center;justify-content:space-between;margin-top:14px;flex-wrap:wrap}
.upload{cursor:pointer;color:var(--muted);border:1px dashed var(--border);padding:10px 14px;border-radius:12px}
button.primary{background:var(--primary);color:#fff;border:none;border-radius:12px;padding:13px 26px;font-size:1rem;font-weight:600;cursor:pointer;transition:.15s}
button.primary:hover{background:var(--primary-d)}
button.primary:disabled{opacity:.6;cursor:wait}
.hint{color:var(--muted);font-size:.85rem;margin:12px 0 0}
.results{margin-top:22px;display:grid;gap:16px}
.summary-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px}
.metric{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:16px;text-align:center}
.metric b{display:block;font-size:1.5rem}
.metric.danger b{color:var(--danger)}
.metric.good b{color:var(--primary)}
.finding{border-left:4px solid var(--accent);background:var(--surface);border:1px solid var(--border);border-left-width:4px;border-radius:10px;padding:12px 14px}
.finding.high{border-left-color:var(--danger)}
.finding.medium{border-left-color:#f59e0b}
.block{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:18px}
.block h3{margin:0 0 8px}
.block pre{white-space:pre-wrap;font-family:inherit;margin:0;color:var(--text)}
.copy{margin-top:10px;background:var(--accent);color:#fff;border:none;border-radius:10px;padding:9px 16px;cursor:pointer}
.how{padding:48px 0}
.steps{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px}
.steps li{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:18px}
.steps span{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--primary);color:#fff;font-weight:700}
.steps h3{margin:10px 0 4px}
.faq{padding:24px 0 64px}
.faq details{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:14px 16px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:600}
h2{font-size:1.8rem;margin:0 0 18px}
footer{border-top:1px solid var(--border);padding:24px;text-align:center;color:var(--muted);font-size:.9rem}
.fab{position:fixed;right:20px;bottom:20px;background:var(--primary);color:#fff;border:none;border-radius:30px;padding:13px 20px;font-weight:600;cursor:pointer;box-shadow:var(--shadow);z-index:30}
.assistant{position:fixed;right:20px;bottom:20px;width:min(360px,92vw);height:min(520px,80vh);background:var(--surface);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);display:flex;flex-direction:column;z-index:40;overflow:hidden}
.assistant-head{padding:14px 16px;font-weight:700;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}
.assistant-head button{background:none;border:none;font-size:1.4rem;cursor:pointer;color:var(--muted)}
.chat-log{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:10px}
.msg{padding:10px 12px;border-radius:12px;max-width:85%;font-size:.92rem}
.msg.user{align-self:flex-end;background:var(--primary);color:#fff}
.msg.bot{align-self:flex-start;background:var(--bg);border:1px solid var(--border)}
.chat-form{display:flex;gap:8px;padding:12px;border-top:1px solid var(--border)}
.chat-form input{flex:1;border:1px solid var(--border);border-radius:10px;padding:10px;background:var(--bg);color:var(--text)}
.chat-form button{background:var(--primary);color:#fff;border:none;border-radius:10px;padding:0 16px;cursor:pointer}
@media(max-width:520px){.nav nav a{display:none}}