*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--bg:#0f1117;--bg2:#181b25;--bg3:#1f2333;--surface:#252a3a;--border:#2e3448;--text:#e2e6f3;--text-dim:#8b92a8;--text-muted:#5c6380;--accent:#6c8cff;--accent2:#4ecdc4;--green:#4ade80;--yellow:#fbbf24;--red:#f87171;--radius:12px;--radius-sm:8px;--shadow:0 4px 24px rgba(0,0,0,.3);--font:system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
img,svg{max-width:100%}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

/* Header */
.site-header{background:var(--bg2);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;backdrop-filter:blur(12px)}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:700;font-size:1.15rem}
.logo:hover{text-decoration:none}
.logo svg{color:var(--accent)}
.nav{display:flex;gap:24px}
.nav a{color:var(--text-dim);font-size:.9rem;font-weight:500}
.nav a:hover{color:var(--text);text-decoration:none}

/* Hero */
.hero{padding:80px 0 60px;text-align:center;background:linear-gradient(180deg,var(--bg2) 0%,var(--bg) 100%)}
.hero h1{font-size:clamp(1.8rem,4vw,2.8rem);font-weight:800;line-height:1.2;max-width:700px;margin:0 auto 16px;background:linear-gradient(135deg,var(--text) 0%,var(--accent) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-sub{font-size:1.1rem;color:var(--text-dim);max-width:560px;margin:0 auto 32px}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;border-radius:var(--radius-sm);font-size:.9rem;font-weight:600;cursor:pointer;border:1px solid var(--border);background:var(--bg3);color:var(--text);transition:all .2s}
.btn:hover{background:var(--surface);text-decoration:none}
.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn-primary:hover{background:#5a7af5}
.btn-lg{padding:14px 28px;font-size:1rem}
.btn-sm{padding:6px 14px;font-size:.8rem}
.btn-check{width:100%;margin-top:8px;padding:12px;font-size:1rem}
.btn-check:disabled{opacity:.4;cursor:not-allowed}

/* Checker */
.checker-section{padding:48px 0}
.checker-layout{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.checker-panel{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:28px}
.checker-panel h2{font-size:1.1rem;margin-bottom:20px;padding-bottom:12px;border-bottom:1px solid var(--border)}
.result-panel{grid-column:1/-1}
.field{margin-bottom:16px}
.field label{display:block;font-size:.85rem;font-weight:600;color:var(--text-dim);margin-bottom:6px}
.field select,.field input[type="text"],.field input[type="number"]{width:100%;padding:10px 14px;background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-size:.9rem;outline:none;transition:border-color .2s}
.field select:focus,.field input:focus{border-color:var(--accent)}
.checkbox-group{display:flex;flex-direction:column;gap:8px}
.checkbox{display:flex;align-items:center;gap:8px;font-size:.85rem;color:var(--text-dim);cursor:pointer}
.checkbox input{accent-color:var(--accent);width:16px;height:16px}

/* Results */
.result-empty{text-align:center;padding:40px 20px;color:var(--text-muted)}
.result-empty svg{margin-bottom:16px;opacity:.3}
.verdict{padding:20px;border-radius:var(--radius-sm);margin-bottom:20px;text-align:center;font-size:1.1rem;font-weight:700}
.verdict-full{background:rgba(74,222,128,.1);border:1px solid rgba(74,222,128,.3);color:var(--green)}
.verdict-partial{background:rgba(251,191,36,.1);border:1px solid rgba(251,191,36,.3);color:var(--yellow)}
.verdict-none{background:rgba(248,113,113,.1);border:1px solid rgba(248,113,113,.3);color:var(--red)}
.result-details{margin-bottom:20px}
.result-details h3{font-size:.95rem;margin-bottom:8px;color:var(--text-dim)}
.result-details ul{list-style:none;display:flex;flex-direction:column;gap:6px}
.result-details li{font-size:.9rem;padding:8px 12px;background:var(--bg3);border-radius:var(--radius-sm)}
.result-details li strong{color:var(--text)}
.result-actions{display:flex;gap:10px;flex-wrap:wrap}

/* Guide Section */
.guide-section{padding:64px 0;background:var(--bg2)}
.guide-section h2{font-size:1.6rem;margin-bottom:8px}
.section-into{color:var(--text-dim);margin-bottom:28px;max-width:600px}
.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--border)}
table{width:100%;border-collapse:collapse;font-size:.88rem}
th{text-align:left;padding:12px 16px;background:var(--bg3);color:var(--text-dim);font-weight:600;border-bottom:1px solid var(--border)}
td{padding:12px 16px;border-bottom:1px solid var(--border);color:var(--text)}
tr:last-child td{border-bottom:none}
tr:hover td{background:var(--bg3)}
.tip-box{margin-top:20px;padding:16px 20px;background:rgba(108,140,255,.08);border:1px solid rgba(108,140,255,.2);border-radius:var(--radius-sm);font-size:.9rem;color:var(--text-dim)}

/* Port Reference */
.reference-section{padding:64px 0}
.reference-section h2{font-size:1.6rem;margin-bottom:32px;text-align:center}
.port-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.port-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:24px}
.port-icon{color:var(--accent);margin-bottom:12px}
.port-card h3{font-size:1rem;margin-bottom:8px}
.port-card p{font-size:.85rem;color:var(--text-dim);line-height:1.5}

/* Mistakes */
.mistakes-section{padding:64px 0;background:var(--bg2)}
.mistakes-section h2{font-size:1.6rem;margin-bottom:32px;text-align:center}
.mistake-list{display:flex;flex-direction:column;gap:20px;max-width:800px;margin:0 auto}
.mistake{display:flex;gap:16px;align-items:flex-start}
.mistake-num{flex-shrink:0;width:36px;height:36px;background:var(--accent);color:#fff;border:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem;border-radius:50%}
.mistake h3{font-size:1rem;margin-bottom:4px}
.mistake p{font-size:.88rem;color:var(--text-dim);line-height:1.5}

/* Edge Cases */
.edge-section{padding:64px 0}
.edge-section h2{font-size:1.6rem;margin-bottom:32px;text-align:center}
.edge-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.edge-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:24px;border-left:3px solid var(--accent2)}
.edge-card h3{font-size:1rem;margin-bottom:8px;color:var(--accent2)}
.edge-card p{font-size:.85rem;color:var(--text-dim);line-height:1.5}

/* Footer */
.site-footer{background:var(--bg2);border-top:1px solid var(--border);padding:40px 0 24px}
.footer-top{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;margin-bottom:24px}
.footer-brand{max-width:320px}
.footer-brand strong{font-size:1.1rem}
.footer-brand p{font-size:.85rem;color:var(--text-dim);margin-top:8px}
.footer-links{display:flex;gap:20px;flex-wrap:wrap}
.footer-links a{font-size:.85rem;color:var(--text-dim)}
.footer-bottom{padding-top:20px;border-top:1px solid var(--border)}
.footer-bottom p{font-size:.8rem;color:var(--text-muted)}
.footer-bottom a{color:var(--text-muted)}

/* Responsive */
@media(max-width:768px){
  .nav{display:none}
  .hero{padding:48px 0 40px}
  .checker-layout{grid-template-columns:1fr}
  .result-panel{grid-column:auto}
  .footer-top{flex-direction:column;gap:24px}
  .port-grid,.edge-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
  .container{padding:0 16px}
  .checker-panel{padding:20px}
}

/* Print */
@media print{
  .site-header,.site-footer,.result-actions,.btn,.nav{display:none}
  body{background:#fff;color:#000}
  .checker-panel{border:1px solid #ccc;break-inside:avoid}
  .verdict{border:1px solid #ccc}
}

/* Focus styles */
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}

/* Scroll margin for anchors */
section[id]{scroll-margin-top:80px}



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}