/* ===== RESET & BASE ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --c-green-50:#f0fdf4;--c-green-100:#dcfce7;--c-green-600:#16a34a;--c-green-700:#15803d;--c-green-800:#166534;
  --c-amber-50:#fffbeb;--c-amber-100:#fef3c7;--c-amber-600:#d97706;--c-amber-700:#b45309;--c-amber-800:#92400e;
  --c-red-50:#fef2f2;--c-red-100:#fee2e2;--c-red-600:#dc2626;--c-red-700:#b91c1c;--c-red-800:#991b1b;
  --c-blue-50:#eff6ff;--c-blue-100:#dbeafe;--c-blue-600:#2563eb;--c-blue-700:#1d4ed8;
  --c-gray-50:#f9fafb;--c-gray-100:#f3f4f6;--c-gray-200:#e5e7eb;--c-gray-300:#d1d5db;--c-gray-500:#6b7280;--c-gray-600:#4b5563;--c-gray-700:#374151;--c-gray-800:#1f2937;--c-gray-900:#111827;
  --font-sans:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  --radius:12px;--radius-sm:8px;--shadow:0 1px 3px rgba(0,0,0,.1),0 1px 2px rgba(0,0,0,.06);--shadow-md:0 4px 6px rgba(0,0,0,.07),0 2px 4px rgba(0,0,0,.06);--shadow-lg:0 10px 25px rgba(0,0,0,.1);
  --max-w:1120px;--header-h:60px;
}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 16px)}
body{font-family:var(--font-sans);color:var(--c-gray-800);background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;height:auto}
a{color:var(--c-blue-700);text-decoration:none}
a:hover{text-decoration:underline}
.container{width:100%;max-width:var(--max-w);margin:0 auto;padding:0 20px}
.skip-link{position:absolute;top:-100%;left:16px;background:var(--c-blue-700);color:#fff;padding:8px 16px;border-radius:var(--radius-sm);z-index:9999;font-weight:600}
.skip-link:focus{top:8px}

/* ===== HEADER ===== */
.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--c-gray-200);height:var(--header-h)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:100%;gap:16px}
.logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.05rem;color:var(--c-gray-900);text-decoration:none;flex-shrink:0}
.logo:hover{text-decoration:none}
.logo-icon{width:28px;height:28px;color:var(--c-red-600)}
.main-nav{display:flex;gap:4px;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}
.main-nav::-webkit-scrollbar{display:none}
.main-nav a{padding:6px 10px;font-size:.875rem;color:var(--c-gray-600);border-radius:var(--radius-sm);white-space:nowrap;text-decoration:none;font-weight:500}
.main-nav a:hover{background:var(--c-gray-100);color:var(--c-gray-900);text-decoration:none}

/* ===== HERO ===== */
.hero{background:linear-gradient(135deg,var(--c-red-50) 0%,#fff 60%);padding:48px 0 32px;border-bottom:1px solid var(--c-gray-200)}
.hero h1{font-size:clamp(1.6rem,4vw,2.4rem);line-height:1.2;color:var(--c-gray-900);font-weight:800}
.hero-accent{color:var(--c-red-700)}
.hero-sub{font-size:1.05rem;color:var(--c-gray-600);margin-top:12px;max-width:600px}

/* ===== CHECKLIST BUILDER ===== */
.checklist-builder{padding:40px 0}
.builder-grid{display:grid;grid-template-columns:1fr;gap:24px}
@media(min-width:768px){
  .builder-grid{grid-template-columns:340px 1fr;align-items:start}
}
.inputs-panel{background:var(--c-gray-50);border:1px solid var(--c-gray-200);border-radius:var(--radius);padding:24px;position:sticky;top:calc(var(--header-h) + 16px)}
.result-panel{border:1px solid var(--c-gray-200);border-radius:var(--radius);padding:24px}
.panel-title{font-size:1.15rem;font-weight:700;color:var(--c-gray-900);margin-bottom:16px}
.input-group{margin-bottom:14px}
.input-label{display:block;font-size:.85rem;font-weight:600;color:var(--c-gray-700);margin-bottom:4px}
.select-input{width:100%;padding:10px 12px;border:2px solid var(--c-gray-300);border-radius:var(--radius-sm);font-size:.95rem;background:#fff;color:var(--c-gray-800);transition:border-color .15s;font-family:inherit}
.select-input:focus{outline:none;border-color:var(--c-blue-600);box-shadow:0 0 0 3px rgba(37,99,235,.15)}
.presets{margin-top:16px;padding-top:16px;border-top:1px solid var(--c-gray-200)}
.presets-label{font-size:.8rem;font-weight:600;color:var(--c-gray-500);margin-bottom:8px}
.preset-btn{display:block;width:100%;text-align:left;padding:8px 12px;margin-bottom:6px;background:#fff;border:1px solid var(--c-gray-200);border-radius:var(--radius-sm);font-size:.82rem;cursor:pointer;color:var(--c-gray-700);transition:all .15s;font-family:inherit}
.preset-btn:hover{border-color:var(--c-blue-600);color:var(--c-blue-700);background:var(--c-blue-50)}

/* ===== CALLOUT ===== */
.callout{padding:12px 16px;border-radius:var(--radius-sm);font-size:.875rem;margin-top:16px;line-height:1.5}
.callout-info{background:var(--c-blue-50);border-left:4px solid var(--c-blue-600);color:var(--c-gray-700)}

/* ===== RESULT ===== */
.result-header{display:flex;flex-wrap:wrap;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:16px}
.result-actions{display:flex;gap:8px;flex-wrap:wrap}
.checklist-output{min-height:200px}
.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:48px 16px;text-align:center;color:var(--c-gray-500)}
.empty-icon{width:48px;height:48px;margin-bottom:12px;color:var(--c-gray-300)}
.empty-hint{font-size:.82rem;margin-top:4px;color:var(--c-gray-400)}

/* ===== CHECKLIST STEPS ===== */
.checklist-steps{list-style:none;display:flex;flex-direction:column;gap:0}
.checklist-step{display:flex;gap:14px;padding:14px 0;border-bottom:1px solid var(--c-gray-100)}
.checklist-step:last-child{border-bottom:none}
.step-number{flex-shrink:0;width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.85rem;color:#fff}
.step-green{background:var(--c-green-600)}
.step-amber{background:var(--c-amber-600)}
.step-red{background:var(--c-red-600)}
.step-content{flex:1}
.step-content h3{font-size:.95rem;font-weight:700;color:var(--c-gray-900);margin-bottom:3px}
.step-content p{font-size:.875rem;color:var(--c-gray-600);line-height:1.5}
.step-content .step-detail{font-size:.82rem;color:var(--c-gray-500);margin-top:4px}

/* ===== SEVERITY BADGE ===== */
.severity-badge{margin-top:20px;padding:14px 18px;border-radius:var(--radius-sm);font-size:.9rem;font-weight:600;display:flex;align-items:center;gap:10px}
.severity-low{background:var(--c-green-50);border:1px solid var(--c-green-600);color:var(--c-green-800)}
.severity-medium{background:var(--c-amber-50);border:1px solid var(--c-amber-600);color:var(--c-amber-800)}
.severity-high{background:var(--c-red-50);border:1px solid var(--c-red-600);color:var(--c-red-800)}
.severity-badge svg{flex-shrink:0;width:24px;height:24px}

/* ===== MECHANIC PHRASE ===== */
.mechanic-phrase{margin-top:20px;padding:16px;background:var(--c-gray-50);border-radius:var(--radius-sm);border:1px solid var(--c-gray-200)}
.mechanic-phrase h3{font-size:.9rem;font-weight:700;margin-bottom:8px;color:var(--c-gray-800)}
.mechanic-phrase p{font-size:.875rem;color:var(--c-gray-700);background:#fff;padding:12px;border-radius:var(--radius-sm);border:1px solid var(--c-gray-200);line-height:1.6;margin-bottom:10px;font-family:monospace}

/* ===== BUTTONS ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 16px;border-radius:var(--radius-sm);font-size:.85rem;font-weight:600;cursor:pointer;transition:all .15s;border:2px solid transparent;font-family:inherit;text-decoration:none;line-height:1.4}
.btn:hover{text-decoration:none}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn-outline{background:#fff;border-color:var(--c-gray-300);color:var(--c-gray-700)}
.btn-outline:hover:not(:disabled){border-color:var(--c-gray-500);color:var(--c-gray-900)}
.btn-primary{background:var(--c-blue-600);color:#fff;border-color:var(--c-blue-600)}
.btn-primary:hover:not(:disabled){background:var(--c-blue-700);border-color:var(--c-blue-700)}
.btn-small{padding:6px 12px;font-size:.8rem}

/* ===== COMPARISON ===== */
.comparison-section{padding:48px 0;background:var(--c-gray-50);border-top:1px solid var(--c-gray-200)}
.comparison-section h2{font-size:1.5rem;font-weight:800;color:var(--c-gray-900);margin-bottom:8px}
.section-intro{color:var(--c-gray-600);margin-bottom:24px;max-width:680px}
.comparison-grid{display:grid;grid-template-columns:1fr;gap:20px;margin-bottom:32px}
@media(min-width:700px){.comparison-grid{grid-template-columns:1fr 1fr}}
.comparison-card{background:#fff;border:1px solid var(--c-gray-200);border-radius:var(--radius);padding:24px}
.comparison-card h3{font-size:1.05rem;font-weight:700;color:var(--c-gray-900);margin-bottom:10px;padding-bottom:8px;border-bottom:2px solid var(--c-red-600)}
.comparison-card p{font-size:.9rem;color:var(--c-gray-600);line-height:1.6;margin-bottom:10px}
.damage-table-wrap{overflow-x:auto}
.damage-table-wrap h3{font-size:1.05rem;font-weight:700;color:var(--c-gray-900);margin-bottom:12px}
.damage-table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--c-gray-200);border-radius:var(--radius);overflow:hidden}
.damage-table th,.damage-table td{padding:12px 16px;text-align:left;font-size:.875rem;border-bottom:1px solid var(--c-gray-200)}
.damage-table th{background:var(--c-gray-100);font-weight:700;color:var(--c-gray-800)}
.damage-table tr:last-child td{border-bottom:none}
.table-note{font-size:.8rem;color:var(--c-gray-500);margin-top:10px}

/* ===== MISTAKES ===== */
.mistakes-section{padding:48px 0}
.mistakes-section h2{font-size:1.5rem;font-weight:800;color:var(--c-gray-900);margin-bottom:24px}
.mistakes-grid{display:grid;grid-template-columns:1fr;gap:16px}
@media(min-width:600px){.mistakes-grid{grid-template-columns:1fr 1fr}}
.mistake-card{display:flex;gap:14px;padding:20px;background:#fff;border:1px solid var(--c-gray-200);border-radius:var(--radius)}
.mistake-icon{flex-shrink:0;width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center}
.mistake-icon-red{background:var(--c-red-100);color:var(--c-red-600)}
.mistake-icon-amber{background:var(--c-amber-100);color:var(--c-amber-600)}
.mistake-icon svg{width:22px;height:22px}
.mistake-card h3{font-size:.95rem;font-weight:700;color:var(--c-gray-900);margin-bottom:4px}
.mistake-card p{font-size:.85rem;color:var(--c-gray-600);line-height:1.5}

/* ===== PREVENTION ===== */
.prevention-section{padding:48px 0;background:var(--c-green-50);border-top:1px solid var(--c-gray-200)}
.prevention-section h2{font-size:1.5rem;font-weight:800;color:var(--c-gray-900);margin-bottom:24px}
.prevention-grid{display:grid;grid-template-columns:1fr;gap:16px;margin-bottom:32px}
@media(min-width:700px){.prevention-grid{grid-template-columns:1fr 1fr}}
.prevention-tip{display:flex;gap:14px;padding:20px;background:#fff;border:1px solid var(--c-gray-200);border-radius:var(--radius)}
.tip-number{flex-shrink:0;width:36px;height:36px;border-radius:50%;background:var(--c-green-600);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem}
.prevention-tip h3{font-size:.95rem;font-weight:700;color:var(--c-gray-900);margin-bottom:4px}
.prevention-tip p{font-size:.875rem;color:var(--c-gray-600);line-height:1.5}

/* ===== AFFILIATE ===== */
.affiliate-label{font-size:.8rem;font-weight:600;color:var(--c-gray-500);margin-bottom:8px}
.product-card{display:flex;gap:16px;padding:16px;background:#fff;border:1px solid var(--c-gray-200);border-radius:var(--radius);max-width:520px}
.product-image{flex-shrink:0;width:64px;height:64px;color:var(--c-gray-400)}
.product-info h3{font-size:.9rem;font-weight:700;color:var(--c-gray-900);margin-bottom:4px}
.product-info p{font-size:.82rem;color:var(--c-gray-600);margin-bottom:10px;line-height:1.5}

/* ===== FAQ ===== */
.faq-section{padding:48px 0;border-top:1px solid var(--c-gray-200)}
.faq-section h2{font-size:1.5rem;font-weight:800;color:var(--c-gray-900);margin-bottom:24px}
.faq-list{display:flex;flex-direction:column;gap:8px}
.faq-item{border:1px solid var(--c-gray-200);border-radius:var(--radius-sm);overflow:hidden}
.faq-item summary{padding:14px 18px;font-weight:600;font-size:.92rem;color:var(--c-gray-800);cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:1.2rem;font-weight:400;color:var(--c-gray-400);transition:transform .2s}
.faq-item[open] summary::after{content:"−"}
.faq-item[open] summary{border-bottom:1px solid var(--c-gray-200)}
.faq-item p{padding:14px 18px;font-size:.875rem;color:var(--c-gray-600);line-height:1.6}

/* ===== FOOTER ===== */
.site-footer{background:var(--c-gray-900);color:var(--c-gray-300);padding:40px 0 24px;font-size:.875rem}
.footer-grid{display:grid;grid-template-columns:1fr;gap:24px;margin-bottom:24px}
@media(min-width:600px){.footer-grid{grid-template-columns:2fr 1fr 1fr}}
.site-footer h3{font-size:.95rem;font-weight:700;color:#fff;margin-bottom:8px}
.footer-links{list-style:none;display:flex;flex-direction:column;gap:6px}
.footer-links a{color:var(--c-gray-300);text-decoration:none}
.footer-links a:hover{color:#fff;text-decoration:underline}
.last-updated{font-size:.8rem;color:var(--c-gray-500);margin-top:12px}
.footer-copyright{text-align:center;padding-top:20px;border-top:1px solid rgba(255,255,255,.1);font-size:.8rem;color:var(--c-gray-500)}

/* ===== UTILITY ===== */
.hidden{display:none!important}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* ===== PRINT ===== */
@media print{
  .site-header,.site-footer,.presets,.result-actions,.affiliate-slot,.faq-section,.prevention-section,.mistakes-section,.comparison-section nav.main-nav,.callout{display:none!important}
  body{color:#000}
  .checklist-builder{padding:0}
  .builder-grid{display:block}
  .inputs-panel{display:none}
  .result-panel{border:none;padding:0}
  .severity-badge{border:2px solid #000}
}



/* 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;
}