/* ============================================
   5-Axis CNC Machining Engineering Guide — Style
   Xiamen Goldcattle Plastic & Metal Products Co., Ltd.
   Aesthetic: Technical Reference Manual / Engineering Handbook
   Theme: Blueprint-navy (#2d6a8f) / steel-blue (#4a90c4) on cool white
   Layout: Sectioned handbook with § numbering, left-rule insight boxes,
           decision matrices, process-step timelines, circular quality loop,
           paired comparison panels, engineering note callouts
   ============================================ */

:root{
  --bg:#f4f6f9;
  --bg-alt:#eaeff5;
  --bg-card:#fff;
  --bg-deep:#0b1a2b;
  --bg-mid:#162c46;
  --text-primary:#111b28;
  --text-secondary:#2a3c52;
  --text-muted:#6a7f96;
  --blue:#4a90c4;
  --blue-hover:#3878ad;
  --blue-deep:#2d6a8f;
  --blue-light:rgba(74,144,196,.05);
  --blue-glow:rgba(74,144,196,.10);
  --steel:#5a7fa0;
  --amber:#b8860b;
  --amber-light:rgba(184,134,11,.06);
  --amber-border:rgba(184,134,11,.20);
  --red:#a83232;
  --red-light:rgba(168,50,50,.05);
  --red-border:rgba(168,50,50,.18);
  --green:#1a7a3e;
  --green-light:rgba(26,122,62,.05);
  --green-border:rgba(26,122,62,.18);
  --border:#cdd8e5;
  --border-hover:#a8bdd4;
  --border-subtle:#dde5ee;
  --radius:3px;
  --radius-lg:6px;
  --radius-xl:10px;
  --shadow:0 1px 3px rgba(11,26,43,.04);
  --shadow-md:0 4px 14px rgba(11,26,43,.07);
  --shadow-lg:0 8px 28px rgba(11,26,43,.10);
  --transition:all .2s ease;
}


/* ── Reset & Base ── */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Segoe UI',-apple-system,BlinkMacSystemFont,'Helvetica Neue',Arial,sans-serif;font-size:17px;line-height:1.72;color:var(--text-primary);background:var(--bg)}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-decoration:none;transition:color .2s}
a:hover{color:var(--blue-deep)}

.container{max-width:1180px;margin:0 auto;padding:0 28px}


/* ── Hero — Engineering Document Header ── */
.hero{background:linear-gradient(155deg,#0b1a2b 0%,#142a42 35%,#1b3654 65%,#0d1f33 100%);padding:64px 0 48px;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;inset:0;background:
  repeating-linear-gradient(90deg,transparent,transparent 59px,rgba(74,144,196,.03) 59px,rgba(74,144,196,.03) 60px),
  repeating-linear-gradient(0deg,transparent,transparent 59px,rgba(74,144,196,.025) 59px,rgba(74,144,196,.025) 60px);
  pointer-events:none}
.hero::after{content:'';position:absolute;bottom:0;left:0;right:0;height:60px;background:linear-gradient(to top,var(--bg),transparent);pointer-events:none;z-index:1}

.hero-inner{position:relative;z-index:2}
.hero-doc-label{display:inline-flex;align-items:center;gap:6px;background:rgba(74,144,196,.10);border:1px solid rgba(74,144,196,.20);color:#8ab8db;padding:4px 12px;border-radius:2px;font-size:10px;font-weight:700;letter-spacing:1.2px;text-transform:uppercase;margin-bottom:14px}
.hero-doc-label .icon{font-size:12px}

.hero h2{font-size:32px;font-weight:800;color:#fff;line-height:1.18;margin-bottom:10px;letter-spacing:-.3px}
.hero-sub{font-size:17px;color:#8caec8;line-height:1.7;margin-bottom:20px;max-width:660px}

.hero-meta{display:flex;gap:18px;flex-wrap:wrap;margin-bottom:22px}
.hero-meta-item{font-size:13px;color:#6d95b4;display:flex;align-items:center;gap:5px}
.hero-meta-item strong{color:#b4d4ea;font-weight:600}

.hero-actions{display:flex;gap:10px;flex-wrap:wrap}


/* ── Quick Answer — GEO Direct-Answer Panel ── */
.quick-answer{background:var(--bg-card);border:1px solid var(--border);border-left:4px solid var(--blue);border-radius:var(--radius);padding:20px 24px;margin:32px 0;box-shadow:var(--shadow)}
.quick-answer-label{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:1.2px;color:var(--blue);margin-bottom:8px}
.quick-answer p{font-size:17px;color:var(--text-primary);line-height:1.72}
.quick-answer strong{color:var(--blue-deep)}


/* ── Buttons ── */
.btn{display:inline-block;padding:12px 28px;border-radius:var(--radius);font-size:15px;font-weight:600;cursor:pointer;transition:var(--transition);border:none;text-align:center;text-decoration:none}
.btn-blue{background:linear-gradient(135deg,#4a90c4,#2d6a8f);color:#fff;box-shadow:0 3px 10px rgba(74,144,196,.25)}
.btn-blue:hover{transform:translateY(-2px);box-shadow:0 5px 20px rgba(74,144,196,.35);color:#fff}
.btn-blue:focus-visible{outline:2px solid #a0d0f0;outline-offset:2px}
.cta-section .btn-blue{padding:14px 36px;font-size:16px;letter-spacing:.2px}
.cta-section .btn-blue:hover{animation:cta-pulse .6s ease}
@keyframes cta-pulse{0%{box-shadow:0 3px 10px rgba(74,144,196,.25)}50%{box-shadow:0 6px 28px rgba(74,144,196,.48)}100%{box-shadow:0 3px 10px rgba(74,144,196,.25)}}
.btn-outline{background:transparent;color:#8caec8;border:1.5px solid rgba(255,255,255,.16)}
.btn-outline:hover{border-color:#8ab8db;color:#fff}


/* ── Sections ── */
.section{padding:48px 0}
.section-alt{background:var(--bg-alt)}
.section-deep{background:var(--bg-deep);color:#b8d0e4}
.section-deep h2{color:#fff}
.section-deep .section-desc{color:#7ea0be}
.section-deep h3{color:#c8deee}

h2{font-size:23px;font-weight:700;color:var(--text-primary);margin-bottom:8px;letter-spacing:-.2px;line-height:1.3}
h3{font-size:16px;font-weight:600;color:var(--text-primary);margin-bottom:6px;line-height:1.35}

/* § section numbering */
.sec-num{display:inline-flex;align-items:center;justify-content:center;min-width:30px;height:30px;border-radius:50%;background:var(--blue);color:#fff;font-size:12px;font-weight:700;margin-right:10px;flex-shrink:0}
.section-heading{display:flex;align-items:center;margin-bottom:8px}
.section-heading h2{margin-bottom:0}

.section-desc{font-size:17px;color:var(--text-secondary);margin-bottom:24px;max-width:840px;line-height:1.65}
.section-desc--center{margin-left:auto;margin-right:auto;text-align:center}


/* ── Insight Box — engineering notes & caveats ── */
.insight-box{background:var(--bg-card);border:1px solid var(--border);border-left:4px solid var(--amber);border-radius:var(--radius);padding:16px 20px;margin:20px 0;box-shadow:var(--shadow)}
.insight-box.insight-blue{border-left-color:var(--blue)}
.insight-box.insight-red{border-left-color:var(--red)}
.insight-box.insight-green{border-left-color:var(--green)}
.insight-label{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:1px;margin-bottom:5px}
.insight-label.label-amber{color:var(--amber)}
.insight-label.label-blue{color:var(--blue)}
.insight-label.label-red{color:var(--red)}
.insight-label.label-green{color:var(--green)}
.insight-box p{font-size:15px;color:var(--text-secondary);line-height:1.6}
.insight-box strong{color:var(--text-primary)}


/* ── Comparison Table — decision matrices ── */
.compare-table{width:100%;border-collapse:collapse;background:var(--bg-card);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow);font-size:15px}
.compare-table th{background:linear-gradient(135deg,rgba(74,144,196,.07),rgba(45,106,143,.05));color:var(--blue-deep);font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;padding:12px 16px;text-align:left;border-bottom:2px solid var(--blue)}
.compare-table td{padding:10px 16px;border-bottom:1px solid var(--border-subtle);color:var(--text-secondary)}
.compare-table td:first-child{color:var(--text-primary);font-weight:600;min-width:180px}
.compare-table tr:last-child td{border-bottom:none}
.compare-table tr:hover td{background:var(--blue-light)}
.compare-table .check{color:var(--green);font-weight:700}
.compare-table .cross{color:var(--red);font-weight:700}
.compare-table .partial{color:var(--amber);font-weight:700}


/* ── Decision Matrix — 3-way comparison (3-axis / 3+2 / simultaneous) ── */
.decision-matrix{width:100%;border-collapse:collapse;background:var(--bg-card);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow);font-size:14px}
.decision-matrix th{background:var(--bg-deep);color:#c8deee;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;padding:12px 14px;text-align:center;border-bottom:2px solid var(--blue)}
.decision-matrix th:first-child{text-align:left;background:var(--bg-mid)}
.decision-matrix td{padding:9px 14px;border-bottom:1px solid var(--border-subtle);text-align:center;color:var(--text-secondary)}
.decision-matrix td:first-child{text-align:left;color:var(--text-primary);font-weight:600}
.decision-matrix tr:last-child td{border-bottom:none}
.decision-matrix tr:hover td{background:var(--blue-light)}
.rating-3{color:var(--green);font-size:16px;letter-spacing:2px}
.rating-2{color:var(--blue);font-size:16px;letter-spacing:2px}
.rating-1{color:var(--amber);font-size:16px;letter-spacing:2px}
.rating-0{color:var(--text-muted);font-size:16px;letter-spacing:2px}


/* ── Two-Column Comparison Panels ── */
.dual-panel{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.panel{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:22px 20px;box-shadow:var(--shadow);transition:var(--transition)}
.panel:hover{border-color:var(--border-hover);box-shadow:var(--shadow-md)}
.panel-header{display:flex;align-items:center;gap:8px;margin-bottom:12px;padding-bottom:10px;border-bottom:2px solid var(--blue)}
.panel-icon{width:28px;height:28px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700}
.panel h3{font-size:15px;font-weight:700;color:var(--blue-deep);margin-bottom:0}
.panel ul{list-style:none}
.panel li{font-size:14px;color:var(--text-secondary);padding:4px 0;line-height:1.5}
.panel li::before{content:'→ ';color:var(--blue);font-weight:600}


/* ── Three-Column Panel ── */
.tri-panel{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px}
.tri-panel .panel{border-top:3px solid var(--blue)}


/* ── Process Steps — vertical timeline ── */
.process-steps{position:relative;padding-left:36px;margin:20px 0}
.process-steps::before{content:'';position:absolute;left:14px;top:0;bottom:0;width:2px;background:linear-gradient(to bottom,var(--blue),var(--border))}
.step{position:relative;margin-bottom:24px}
.step:last-child{margin-bottom:0}
.step-dot{position:absolute;left:-36px;top:3px;width:12px;height:12px;border-radius:50%;background:var(--blue);border:2px solid #fff;box-shadow:0 0 0 2px var(--blue);z-index:1}
.step h3{font-size:15px;font-weight:700;color:var(--text-primary);margin-bottom:4px}
.step p{font-size:15px;color:var(--text-secondary);line-height:1.55}


/* ── Quality Loop — circular flow ── */
.quality-loop{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:24px 0}
.q-loop-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:16px 14px;text-align:center;box-shadow:var(--shadow);position:relative;transition:var(--transition)}
.q-loop-item:hover{border-color:var(--blue);box-shadow:var(--shadow-md);transform:translateY(-1px)}
.q-loop-num{display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px;border-radius:50%;background:var(--blue);color:#fff;font-size:11px;font-weight:700;margin-bottom:8px}
.q-loop-item h3{font-size:13px;font-weight:700;color:var(--blue-deep);margin-bottom:4px}
.q-loop-item p{font-size:13px;color:var(--text-secondary);line-height:1.4}
.q-loop-arrow{position:absolute;right:-9px;top:50%;transform:translateY(-50%);color:var(--blue);font-size:16px;z-index:2}
.q-loop-item:last-child .q-loop-arrow{display:none}


/* ── Buyer Checklist — structured verification list ── */
.checklist{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.checklist-group{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:18px 16px;box-shadow:var(--shadow)}
.checklist-group h3{font-size:14px;font-weight:700;color:var(--blue-deep);margin-bottom:10px;padding-bottom:8px;border-bottom:2px solid var(--blue);text-transform:uppercase;letter-spacing:.3px}
.checklist-group ul{list-style:none}
.checklist-group li{font-size:14px;color:var(--text-secondary);padding:5px 0;line-height:1.45;border-bottom:1px solid var(--border-subtle)}
.checklist-group li:last-child{border-bottom:none}
.checklist-group li::before{content:'☐ ';color:var(--blue);font-weight:700}


/* ── Material Consideration Table ── */
.mat-table{width:100%;border-collapse:collapse;background:var(--bg-card);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow)}
.mat-table th{background:linear-gradient(135deg,rgba(74,144,196,.07),rgba(45,106,143,.05));color:var(--blue-deep);font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;padding:12px 16px;text-align:left;border-bottom:2px solid var(--blue)}
.mat-table td{padding:10px 16px;border-bottom:1px solid var(--border-subtle);color:var(--text-secondary);font-size:15px}
.mat-table td:first-child{color:var(--text-primary);font-weight:600}
.mat-table tr:last-child td{border-bottom:none}
.mat-table tr:hover td{background:var(--blue-light)}


/* ── Case Study — deep-dive panel ── */
.case-panel{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);overflow:hidden;box-shadow:var(--shadow-md)}
.case-header{background:linear-gradient(135deg,rgba(74,144,196,.08),rgba(45,106,143,.06));padding:24px 28px;border-bottom:1px solid var(--border)}
.case-header h2{font-size:20px;color:var(--blue-deep);margin-bottom:4px}
.case-header p{font-size:15px;color:var(--text-secondary)}
.case-body{padding:28px}
.case-grid{display:grid;grid-template-columns:1fr 1.4fr;gap:28px;align-items:start}
.case-specs{list-style:none}
.case-specs li{display:flex;align-items:flex-start;gap:8px;padding:8px 0;border-bottom:1px solid var(--border-subtle);font-size:15px;color:var(--text-secondary)}
.case-specs li:last-child{border-bottom:none}
.case-specs li strong{color:var(--text-primary);min-width:120px;flex-shrink:0}
.case-img{border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow)}
.case-body .insight-box{margin-top:18px}


/* ── Cost Framework — itemized breakdown ── */
.cost-layout{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.cost-col{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:22px 20px;box-shadow:var(--shadow)}
.cost-col h3{font-size:15px;font-weight:700;color:var(--blue-deep);margin-bottom:12px;padding-bottom:10px;border-bottom:2px solid var(--blue)}
.cost-item{display:flex;justify-content:space-between;align-items:center;padding:7px 0;border-bottom:1px solid var(--border-subtle);font-size:14px;color:var(--text-secondary)}
.cost-item:last-child{border-bottom:none}
.cost-item .factor{color:var(--text-primary);font-weight:600}
.cost-item .impact{font-size:12px;color:var(--text-muted);text-align:right;max-width:140px}


/* ── CTA Section ── */
.cta-section{background:linear-gradient(155deg,#0b1a2b 0%,#142a42 35%,#1b3654 65%,#0d1f33 100%);padding:56px 0;text-align:center;position:relative;overflow:hidden}
.cta-section::before{content:'';position:absolute;inset:0;background:repeating-linear-gradient(90deg,transparent,transparent 59px,rgba(74,144,196,.03) 59px,rgba(74,144,196,.03) 60px);pointer-events:none}
.cta-inner{position:relative;z-index:1}
.cta-section h2{color:#fff;font-size:26px;margin-bottom:10px}
.cta-section .section-desc{color:#8caec8;margin-left:auto;margin-right:auto;text-align:center;max-width:640px}
.cta-checklist{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin:20px 0 24px}
.cta-check-item{background:rgba(74,144,196,.08);border:1px solid rgba(74,144,196,.18);color:#a8ccdf;padding:6px 14px;border-radius:var(--radius);font-size:13px;font-weight:600}


/* ── FAQ ── */
.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);margin-bottom:10px;overflow:hidden;box-shadow:var(--shadow);transition:var(--transition)}
.faq-item:hover{border-color:var(--border-hover)}
.faq-q{padding:16px 20px;font-size:16px;font-weight:600;color:var(--text-primary);cursor:pointer;display:flex;align-items:center;gap:10px}
.faq-q::before{content:'▸';color:var(--blue);font-size:14px;transition:transform .2s;flex-shrink:0}
.faq-item.open .faq-q::before{transform:rotate(90deg)}
.faq-a{padding:0 20px 16px;font-size:15px;color:var(--text-secondary);line-height:1.65;display:none}
.faq-item.open .faq-a{display:block}
.faq-a strong{color:var(--blue-deep)}


/* ── Capability Grid ── */
.cap-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.cap-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px 18px;box-shadow:var(--shadow);transition:var(--transition)}
.cap-card:hover{border-color:var(--blue);box-shadow:var(--shadow-md);transform:translateY(-1px)}
.cap-card h3{font-size:14px;font-weight:700;color:var(--blue-deep);margin-bottom:8px;text-transform:uppercase;letter-spacing:.3px}
.cap-card ul{list-style:none}
.cap-card li{font-size:14px;color:var(--text-secondary);padding:3px 0;line-height:1.45}
.cap-card li::before{content:'› ';color:var(--blue);font-weight:700}


/* ── Image Panels ── */
.img-panel{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-md)}
.img-panel img{width:100%;height:auto;display:block}
.img-panel .img-caption{padding:14px 18px;font-size:13px;color:var(--text-muted);border-top:1px solid var(--border-subtle)}

.img-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.img-row-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px}


/* ── Internal Links Grid ── */
.link-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.link-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px 18px;box-shadow:var(--shadow);transition:var(--transition);display:flex;align-items:center;gap:14px}
.link-card:hover{border-color:var(--blue);box-shadow:var(--shadow-md);transform:translateY(-1px)}
.link-icon{width:40px;height:40px;border-radius:var(--radius-lg);background:var(--blue-light);border:1px solid rgba(74,144,196,.15);display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0;color:var(--blue)}
.link-card h3{font-size:14px;font-weight:700;color:var(--blue-deep);margin-bottom:3px}
.link-card p{font-size:13px;color:var(--text-muted);line-height:1.4}


/* ── RFQ Info Panel ── */
.rfq-panel{background:var(--bg-card);border:2px solid var(--blue);border-radius:var(--radius-xl);padding:28px 24px;box-shadow:var(--shadow-md)}
.rfq-panel h3{font-size:16px;font-weight:700;color:var(--blue-deep);margin-bottom:10px}
.rfq-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
.rfq-item{background:var(--blue-light);border:1px solid rgba(74,144,196,.12);border-radius:var(--radius);padding:12px 14px;font-size:14px;color:var(--text-secondary)}
.rfq-item strong{display:block;color:var(--text-primary);font-size:13px;margin-bottom:3px;text-transform:uppercase;letter-spacing:.3px}


/* ── Setup Flow — 3-axis vs 5-axis ── */
.setup-compare{display:grid;grid-template-columns:1fr auto 1fr;gap:20px;align-items:start}
.setup-col{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:22px 18px;box-shadow:var(--shadow)}
.setup-col h3{font-size:15px;font-weight:700;margin-bottom:12px;padding-bottom:8px;border-bottom:2px solid var(--blue)}
.setup-step{display:flex;align-items:center;gap:8px;padding:6px 0;font-size:14px;color:var(--text-secondary)}
.setup-step .num{width:22px;height:22px;border-radius:50%;background:var(--blue-light);border:1px solid rgba(74,144,196,.2);color:var(--blue);display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;flex-shrink:0}
.setup-vs{display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;color:var(--amber);padding:12px;background:var(--amber-light);border:1px solid var(--amber-border);border-radius:50%;width:48px;height:48px}


/* ── Responsive ── */
@media(max-width:960px){
  .hero-layout,.case-grid,.setup-compare{grid-template-columns:1fr}
  .setup-vs{margin:0 auto;width:40px;height:40px;font-size:12px}
  .dual-panel,.tri-panel,.cost-layout,.link-grid,.checklist{grid-template-columns:1fr}
  .quality-loop{grid-template-columns:1fr 1fr}
  .q-loop-arrow{display:none}
  .cap-grid{grid-template-columns:1fr 1fr}
  .img-row,.img-row-3{grid-template-columns:1fr}
  .rfq-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .container{padding:0 16px}
  .hero h2{font-size:24px}
  .hero-sub{font-size:15px}
  h2{font-size:20px}
  .quality-loop{grid-template-columns:1fr}
  .cap-grid,.rfq-grid{grid-template-columns:1fr}
  .decision-matrix{font-size:12px}
  .decision-matrix th,.decision-matrix td{padding:8px 8px}
}