*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,sans-serif;color:#2d3748;background:#fafaf8;line-height:1.75;font-size:17px}
a{color:#2b6cb0;text-decoration:none;transition:color .2s}
a:hover{color:#1a4f82}

:root{
  --bg-page:#fafaf8;
  --bg-card:#ffffff;
  --bg-accent:#f7f5f0;
  --bg-code:#f0ede6;
  --border:#e2ddd4;
  --border-accent:#c9b99a;
  --text-primary:#2d3748;
  --text-secondary:#4a5568;
  --text-muted:#8a8a7a;
  --accent:#2b6cb0;
  --accent-warm:#b87333;
  --accent-green:#2f7a4f;
  --accent-red:#c53030;
  --accent-teal:#2c7a7b;
  --radius:8px;
  --radius-lg:14px;
}

/* ── Nav ── */
.nav{position:sticky;top:0;z-index:100;background:rgba(250,250,248,.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);padding:10px 0}
.nav-inner{max-width:1100px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between}
.nav-logo{display:flex;align-items:center;gap:10px}
.nav-logo img{height:34px;width:auto;border-radius:6px}
.nav-logo span{font-size:15px;font-weight:600;color:var(--text-primary)}
.nav-links{display:flex;gap:20px;align-items:center}
.nav-links a{font-size:14px;color:var(--text-secondary);font-weight:500}
.nav-links a:hover{color:var(--accent)}

/* ── Hero — textbook chapter opener ── */
.hero{background:linear-gradient(160deg,#f7f5f0 0%,#ede8dc 50%,#e8e0d0 100%);padding:64px 24px 48px;position:relative}
.hero::before{content:'';position:absolute;top:-40px;left:-60px;width:300px;height:300px;background:radial-gradient(circle,rgba(184,115,51,.06) 0%,transparent 70%);pointer-events:none}
.hero-inner{max-width:1100px;margin:0 auto}
.hero-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(43,108,176,.08);border:1px solid rgba(43,108,176,.15);color:var(--accent);font-size:12px;font-weight:600;padding:4px 14px;border-radius:20px;margin-bottom:18px;text-transform:uppercase;letter-spacing:.8px}
.hero h2{font-size:clamp(26px,3.8vw,40px);font-weight:800;color:#1a202c;line-height:1.25;margin-bottom:14px;max-width:780px}
.hero h2 span{color:var(--accent-warm)}
.hero-desc{font-size:17px;color:var(--text-secondary);max-width:680px;line-height:1.7;margin-bottom:28px}

/* Quick answer */
.quick-answer{background:var(--bg-card);border:1px solid var(--border-accent);border-left:4px solid var(--accent-warm);border-radius:0 var(--radius-lg) var(--radius-lg) 0;padding:24px 28px;margin-bottom:32px}
.quick-answer::before{content:'AT A GLANCE';display:block;font-size:10px;font-weight:700;color:var(--accent-warm);letter-spacing:1.2px;margin-bottom:10px;text-transform:uppercase}
.quick-answer p{font-size:16px;line-height:1.75;color:var(--text-primary)}

/* Process flow strip */
.process-flow{display:flex;flex-wrap:wrap;gap:0;align-items:center;margin:20px 0 0;justify-content:center}
.process-step{display:flex;align-items:center;gap:0}
.process-step .step-box{background:var(--bg-card);border:1px solid var(--border);border-radius:6px;padding:8px 14px;font-size:13px;font-weight:600;color:var(--text-primary);white-space:nowrap}
.process-step .arrow{font-size:18px;color:var(--border-accent);margin:0 6px}

/* ── Section ── */
.section{max-width:1100px;margin:0 auto;padding:52px 24px}
.section-warm{background:var(--bg-accent);padding:52px 24px}
.section-warm .section-inner{max-width:1100px;margin:0 auto}

.section h2{font-size:26px;font-weight:700;color:#1a202c;margin-bottom:6px;line-height:1.3;border-bottom:2px solid var(--border);padding-bottom:10px}
.section h2 .num{color:var(--accent-warm);font-weight:400;margin-right:10px;font-size:22px;font-variant-numeric:tabular-nums}
.section-warm h2{font-size:26px;font-weight:700;color:#1a202c;margin-bottom:6px;border-bottom:2px solid var(--border);padding-bottom:10px}
.section-warm h2 .num{color:var(--accent-warm);font-weight:400;margin-right:10px;font-size:22px}
.section .subtitle{color:var(--text-secondary);font-size:16px;margin-bottom:28px;line-height:1.65}
.section-warm .subtitle{color:var(--text-secondary);font-size:16px;margin-bottom:28px;line-height:1.65}

/* ── Numbered process steps ── */
.process-steps{margin:28px 0}
.process-step-card{display:flex;gap:20px;margin-bottom:24px;align-items:flex-start}
.step-num{flex-shrink:0;width:40px;height:40px;background:var(--accent-warm);color:#fff;border-radius:50%;font-size:16px;font-weight:700;display:flex;align-items:center;justify-content:center;margin-top:2px}
.step-content{flex:1}
.step-content h3{font-size:17px;font-weight:700;color:var(--text-primary);margin-bottom:6px}
.step-content p{font-size:15px;color:var(--text-secondary);line-height:1.7}
.step-content .tech-note{background:var(--bg-code);border:1px solid var(--border);border-radius:6px;padding:12px 16px;margin:10px 0;font-size:14px;color:var(--accent-teal);line-height:1.6}

/* ── Mold components ── */
.mold-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px;margin:24px 0}
.mold-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;transition:border-color .2s}
.mold-item:hover{border-color:var(--accent-warm)}
.mold-item h3{font-size:16px;font-weight:700;color:var(--accent-warm);margin-bottom:6px}
.mold-item p{font-size:14px;color:var(--text-secondary);line-height:1.6}

/* ── Material cards ── */
.material-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:24px 0}
.material-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px 18px;text-align:center;transition:transform .15s,border-color .15s}
.material-card:hover{transform:translateY(-2px);border-color:var(--accent)}
.material-card .mat-abbr{font-size:22px;font-weight:800;color:var(--accent);display:block;margin-bottom:2px}
.material-card .mat-name{font-size:13px;color:var(--text-muted);margin-bottom:10px}
.material-card .mat-traits{font-size:14px;color:var(--text-secondary);line-height:1.55;margin-bottom:10px}
.material-card .mat-apps{font-size:13px;color:var(--accent-warm);font-weight:500}

/* ── Selection decision cards ── */
.decision-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:16px;margin:24px 0}
.decision-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px 22px;display:flex;gap:14px;align-items:flex-start}
.decision-card .q{flex-shrink:0;font-size:20px;color:var(--accent-warm);font-weight:700;line-height:1}
.decision-card .a{flex:1}
.decision-card .a .need{font-size:15px;font-weight:600;color:var(--text-primary);margin-bottom:4px}
.decision-card .a .rec{font-size:14px;color:var(--accent);font-weight:500}

/* ── Comparison table ── */
.compare-wrap{overflow-x:auto;margin:24px 0;border-radius:var(--radius);border:1px solid var(--border);background:var(--bg-card)}
.compare-table{width:100%;border-collapse:collapse;font-size:15px}
.compare-table thead{background:rgba(43,108,176,.06)}
.compare-table th{padding:13px 16px;text-align:left;color:var(--accent);font-weight:600;font-size:13px;text-transform:uppercase;letter-spacing:.5px;border-bottom:2px solid var(--border-accent)}
.compare-table td{padding:12px 16px;border-bottom:1px solid var(--border);color:var(--text-primary)}
.compare-table tbody tr:hover{background:rgba(43,108,176,.03)}

/* ── Design consideration cards ── */
.design-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px;margin:24px 0}
.design-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px}
.design-card h3{font-size:15px;font-weight:700;color:var(--accent-warm);margin-bottom:6px}
.design-card p{font-size:14px;color:var(--text-secondary);line-height:1.6}

/* ── Defect table ── */
.defect-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:14px;margin:24px 0}
.defect-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;display:flex;gap:12px;align-items:flex-start}
.defect-dot{flex-shrink:0;width:10px;height:10px;border-radius:50%;background:var(--accent-red);margin-top:6px}
.defect-item .d-name{font-size:15px;font-weight:600;color:var(--accent-red);margin-bottom:3px}
.defect-item .d-cause{font-size:14px;color:var(--text-secondary);line-height:1.5}

/* ── QC steps ── */
.qc-timeline{margin:24px 0;position:relative;padding-left:32px}
.qc-timeline::before{content:'';position:absolute;left:14px;top:0;bottom:0;width:2px;background:var(--border-accent)}
.qc-step{position:relative;margin-bottom:24px}
.qc-step::before{content:'';position:absolute;left:-24px;top:4px;width:14px;height:14px;border-radius:50%;background:var(--accent);border:3px solid var(--bg-page)}
.qc-step h3{font-size:16px;font-weight:700;color:var(--text-primary);margin-bottom:4px}
.qc-step p{font-size:14px;color:var(--text-secondary);line-height:1.65}

/* ── Cost factors ── */
.cost-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;margin:24px 0}
.cost-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:18px 16px;text-align:center}
.cost-item .cost-icon{font-size:24px;margin-bottom:6px;display:block}
.cost-item h3{font-size:14px;font-weight:700;color:var(--accent-warm);margin-bottom:4px}
.cost-item p{font-size:13px;color:var(--text-secondary);line-height:1.5}

/* ── Prototype-to-production path ── */
.path-flow{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:0;margin:28px 0}
.path-node{display:flex;align-items:center}
.path-node .node-box{background:var(--bg-card);border:1px solid var(--border);border-radius:8px;padding:10px 18px;font-size:14px;font-weight:600;color:var(--text-primary);text-align:center;min-width:120px}
.path-node .node-arrow{font-size:20px;color:var(--border-accent);margin:0 8px}

/* ── FAQ ── */
.faq-list{margin-top:24px}
.faq-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:10px;overflow:hidden}
.faq-q{padding:16px 20px;font-size:15px;font-weight:600;color:var(--text-primary);cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.faq-q::after{content:'+';color:var(--accent);font-size:20px;font-weight:300;transition:transform .2s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 20px 16px;font-size:15px;color:var(--text-secondary);line-height:1.7;display:none}
.faq-item.open .faq-a{display:block}

/* ── CTA ── */
.cta-bar{background:linear-gradient(135deg,var(--accent),#1a4f82);border-radius:var(--radius-lg);padding:36px 28px;text-align:center;margin:44px 0}
.cta-bar h2{color:#fff;font-size:24px;margin-bottom:10px}
.cta-bar p{color:rgba(255,255,255,.85);font-size:15px;margin-bottom:22px;max-width:580px;margin-left:auto;margin-right:auto}
.cta-btn{display:inline-block;background:linear-gradient(135deg,#fff,#f7f5f0);color:var(--accent);font-size:16px;font-weight:700;padding:13px 34px;border-radius:8px;text-decoration:none;border:2px solid rgba(255,255,255,.3);cursor:pointer;transition:background .2s,transform .15s,box-shadow .15s}
.cta-btn:hover{background:#fff;transform:translateY(-2px);box-shadow:0 6px 24px rgba(0,0,0,.15)}
.cta-btn:active{transform:translateY(0);box-shadow:0 2px 8px rgba(0,0,0,.1)}

/* ── Link cards ── */
.link-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px;margin:24px 0}
.link-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;transition:border-color .2s}
.link-card:hover{border-color:var(--accent)}
.link-card .lc-label{font-size:11px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.7px;margin-bottom:4px}
.link-card a{font-size:15px;color:var(--accent);font-weight:600}
.link-card p{font-size:13px;color:var(--text-secondary);margin-top:5px;line-height:1.5}

/* ── Disclaimer ── */
.disclaimer-box{background:rgba(184,115,51,.06);border:1px solid rgba(184,115,51,.2);border-radius:var(--radius);padding:16px 20px;margin:24px 0;font-size:14px;color:var(--accent-warm);line-height:1.6}

/* ── Image ── */
.img-section{margin:32px 0;border-radius:var(--radius-lg);overflow:hidden}
.img-section img{width:100%;height:auto;display:block;border-radius:var(--radius-lg);border:1px solid var(--border)}
.img-section .caption{font-size:13px;color:var(--text-muted);margin-top:8px;text-align:center;font-style:italic}

.media-text{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center;margin:28px 0}
@media(max-width:768px){.media-text{grid-template-columns:1fr}}
.media-text img{width:100%;border-radius:var(--radius-lg);border:1px solid var(--border)}
.media-text .text-side h3{font-size:18px;color:var(--text-primary);font-weight:600;margin-bottom:10px}
.media-text .text-side p{font-size:15px;color:var(--text-secondary);line-height:1.7}

/* ── Bullet list ── */
.bullet-list{list-style:none;margin:12px 0;padding:0}
.bullet-list li{padding:6px 0 6px 24px;position:relative;font-size:15px;color:var(--text-secondary);line-height:1.6}
.bullet-list li::before{content:'';position:absolute;left:4px;top:14px;width:7px;height:7px;border-radius:50%;background:var(--accent-warm)}

/* ── Footer ── */
.footer{background:#2d3748;border-top:1px solid var(--border);padding:32px 24px;text-align:center}
.footer p{font-size:13px;color:#a0aec0}
.footer a{color:#cbd5e0}

/* ── Responsive ── */
@media(max-width:640px){
  .hero{padding:40px 16px 32px}
  .hero h1{font-size:24px}
  .section,.section-warm{padding:32px 16px}
  .process-flow{flex-direction:column;align-items:stretch}
  .process-step .arrow{display:none}
  .mold-grid,.material-grid,.design-grid,.defect-grid,.decision-grid{grid-template-columns:1fr}
  .cost-grid{grid-template-columns:1fr 1fr}
  .compare-table{font-size:13px}
  .compare-table th,.compare-table td{padding:9px 10px}
  .path-flow{flex-direction:column}
  .path-node .node-arrow{display:none}
  .data-table{font-size:13px}
}

/* ── Utility ── */
.mt-10{margin-top:10px}
.mt-12{margin-top:12px}
.mt-14{margin-top:14px}
.mt-16{margin-top:16px}
.mt-24{margin-top:24px}
.mt-28{margin-top:28px}
.text-sm{font-size:14px}
.text-sm-warm{font-size:14px;color:var(--accent-warm);font-weight:500}
.text-sm-secondary{font-size:14px;color:var(--text-secondary)}
.text-md-secondary{font-size:15px;color:var(--text-secondary)}