/* Idiot Educational Tools — main stylesheet */
:root{
  --indigo-50:#eef2ff; --indigo-100:#e0e7ff; --indigo-500:#6366f1; --indigo-600:#4f46e5; --indigo-700:#4338ca;
  --slate-50:#f8fafc; --slate-100:#f1f5f9; --slate-200:#e2e8f0; --slate-300:#cbd5e1;
  --slate-500:#64748b; --slate-600:#475569; --slate-700:#334155; --slate-800:#1e293b; --slate-900:#0f172a;
  --white:#fff; --radius:12px; --shadow:0 1px 3px rgba(15,23,42,.08),0 1px 2px rgba(15,23,42,.06);
  --shadow-lg:0 10px 25px -5px rgba(15,23,42,.12),0 8px 10px -6px rgba(15,23,42,.08);
  --maxw:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  color:var(--slate-800);background:var(--slate-50);line-height:1.6}
a{color:var(--indigo-600);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
h1,h2,h3,h4{color:var(--slate-900);line-height:1.25;font-weight:700}
h1{font-size:2rem}
h2{font-size:1.5rem}
h3{font-size:1.15rem}
p{color:var(--slate-600)}

/* Header */
header.site-header{background:var(--white);border-bottom:1px solid var(--slate-200);position:sticky;top:0;z-index:50}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 20px;max-width:var(--maxw);margin:0 auto}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem;color:var(--slate-900)}
.brand img{width:32px;height:32px;border-radius:8px}
nav.main-nav{display:flex;align-items:center;gap:22px}
nav.main-nav a{color:var(--slate-600);font-weight:600;font-size:.95rem}
nav.main-nav a:hover{color:var(--indigo-600);text-decoration:none}
.search-box{position:relative;flex:1;max-width:340px}
.search-box input{width:100%;padding:9px 14px;border:1px solid var(--slate-300);border-radius:9px;font-size:.9rem;outline:none;background:var(--slate-50)}
.search-box input:focus{border-color:var(--indigo-500);box-shadow:0 0 0 3px var(--indigo-100)}
.search-results{position:absolute;top:calc(100% + 6px);left:0;right:0;background:var(--white);border:1px solid var(--slate-200);
  border-radius:10px;box-shadow:var(--shadow-lg);max-height:340px;overflow-y:auto;display:none;z-index:60}
.search-results.active{display:block}
.search-results a{display:flex;gap:10px;align-items:center;padding:10px 14px;color:var(--slate-800);font-size:.9rem;border-bottom:1px solid var(--slate-100)}
.search-results a:last-child{border-bottom:none}
.search-results a:hover{background:var(--indigo-50);text-decoration:none}
.search-empty{padding:14px;color:var(--slate-500);font-size:.88rem}
.mobile-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--slate-800)}

/* Hero */
.hero{background:linear-gradient(180deg,var(--indigo-50),var(--slate-50));padding:56px 0 40px;text-align:center}
.hero h1{font-size:2.3rem;margin-bottom:10px}
.hero p.lead{font-size:1.1rem;color:var(--slate-600);max-width:680px;margin:0 auto}
.badge{display:inline-block;background:var(--indigo-100);color:var(--indigo-700);font-weight:700;font-size:.78rem;
  padding:5px 12px;border-radius:999px;margin-bottom:14px;letter-spacing:.02em}

/* Tool grid on homepage */
.section{padding:40px 0}
.section-title{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:20px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.card{background:var(--white);border:1px solid var(--slate-200);border-radius:var(--radius);padding:20px;
  box-shadow:var(--shadow);transition:transform .15s ease, box-shadow .15s ease}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.card .icon{font-size:1.7rem;display:inline-block;background:var(--indigo-50);width:48px;height:48px;line-height:48px;
  text-align:center;border-radius:10px;margin-bottom:12px}
.card h3{margin:0 0 6px;font-size:1.05rem}
.card p{margin:0;font-size:.9rem;color:var(--slate-500)}
.card a.stretched{position:absolute;inset:0}
.card{position:relative}

/* Tool page layout */
.tool-page-header{padding:36px 0 20px}
.tool-widget{background:var(--white);border:1px solid var(--slate-200);border-radius:16px;padding:26px;box-shadow:var(--shadow-lg)}
.field{margin-bottom:16px}
.field label{display:block;font-weight:600;font-size:.88rem;margin-bottom:6px;color:var(--slate-700)}
.field input[type=text], .field input[type=number], .field input[type=date], .field select, .field textarea{
  width:100%;padding:10px 12px;border:1px solid var(--slate-300);border-radius:9px;font-size:.95rem;font-family:inherit;background:var(--slate-50)}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--indigo-500);box-shadow:0 0 0 3px var(--indigo-100)}
.row{display:flex;gap:12px;flex-wrap:wrap}
.row > .field{flex:1;min-width:160px}
.btn{display:inline-block;background:var(--indigo-600);color:#fff;border:none;padding:11px 22px;border-radius:9px;
  font-weight:700;font-size:.95rem;cursor:pointer;transition:background .15s}
.btn:hover{background:var(--indigo-700)}
.btn.secondary{background:var(--slate-200);color:var(--slate-800)}
.btn.secondary:hover{background:var(--slate-300)}
.btn.small{padding:7px 14px;font-size:.85rem}
.result-box{margin-top:18px;padding:18px;background:var(--indigo-50);border-radius:10px;border:1px solid var(--indigo-100);display:none}
.result-box.active{display:block}
.result-box .big{font-size:1.8rem;font-weight:800;color:var(--indigo-700)}
table.grade-table{width:100%;border-collapse:collapse;margin-top:10px}
table.grade-table th,table.grade-table td{border:1px solid var(--slate-200);padding:8px;text-align:left;font-size:.88rem}
table.grade-table th{background:var(--slate-100)}
.chip{display:inline-block;background:var(--slate-100);border-radius:6px;padding:2px 8px;font-size:.78rem;margin-left:6px;color:var(--slate-600)}

/* Content / description */
.content-block{background:var(--white);border:1px solid var(--slate-200);border-radius:14px;padding:28px;margin-top:28px}
.content-block h2{margin-top:0}
.content-block h2:not(:first-child){margin-top:26px}
.faq-item{border-bottom:1px solid var(--slate-200);padding:16px 0}
.faq-item:last-child{border-bottom:none}
.faq-item h3{margin:0 0 6px;font-size:1rem}
.breadcrumb{font-size:.85rem;color:var(--slate-500);margin-bottom:10px}
.breadcrumb a{color:var(--slate-500)}

/* Footer */
footer.site-footer{background:var(--slate-900);color:var(--slate-300);margin-top:60px;padding:44px 0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:28px}
.footer-grid h4{color:#fff;font-size:.92rem;margin-bottom:12px}
.footer-grid a{color:var(--slate-300);font-size:.88rem;display:block;margin-bottom:8px}
.footer-grid a:hover{color:#fff;text-decoration:none}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:12px;color:#fff;font-weight:800}
.footer-brand img{width:28px;height:28px;border-radius:6px}
.footer-bottom{border-top:1px solid var(--slate-700);margin-top:32px;padding-top:20px;display:flex;justify-content:space-between;
  flex-wrap:wrap;gap:10px;font-size:.82rem;color:var(--slate-500)}

/* generic pages */
.static-page{background:var(--white);border:1px solid var(--slate-200);border-radius:14px;padding:32px;margin:32px 0}
.static-page h1{margin-top:0}
.static-page h2{margin-top:24px}

@media (max-width:860px){
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:720px){
  nav.main-nav{position:fixed;top:63px;left:0;right:0;background:#fff;flex-direction:column;align-items:flex-start;
    padding:16px 20px;border-bottom:1px solid var(--slate-200);display:none;gap:14px}
  nav.main-nav.open{display:flex}
  .mobile-toggle{display:block}
  .search-box{order:3;max-width:none;width:100%}
  .header-inner{flex-wrap:wrap}
  .hero h1{font-size:1.6rem}
}