/* ============================================
   Wear-Resistant CNC Aluminum Alloy Parts — Style
   Xiamen Goldcattle Plastic & Metal Products Co., Ltd.
   Aesthetic: Engineering Decision Guide
   Theme: Sky-Blue (#4a90c4) on pale blue-grey
   ============================================ */

:root{
  --bg:#f5f8fb;
  --bg-alt:#e8eff6;
  --bg-card:#fff;
  --bg-card-hover:#f0f5fa;
  --bg-deep:#152840;
  --bg-mid:#dce6f0;
  --text-primary:#1b2a3b;
  --text-secondary:#3a4d62;
  --text-muted:#6b7f96;
  --blue:#4a90c4;
  --blue-hover:#3579b0;
  --blue-deep:#2d6a8f;
  --blue-light:rgba(74,144,196,.07);
  --blue-glow:rgba(74,144,196,.10);
  --steel:#5a7fa0;
  --amber:#d4920a;
  --amber-light:rgba(212,146,10,.08);
  --amber-border:rgba(212,146,10,.25);
  --red:#c0392b;
  --red-light:rgba(192,57,43,.06);
  --red-border:rgba(192,57,43,.2);
  --green:#27844a;
  --green-light:rgba(39,132,74,.06);
  --green-border:rgba(39,132,74,.2);
  --border:#cdd8e5;
  --border-hover:#a8bdd4;
  --border-subtle:#e2eaf2;
  --radius:6px;
  --radius-lg:12px;
  --shadow:0 1px 8px rgba(27,42,59,.05);
  --shadow-md:0 4px 20px rgba(27,42,59,.08);
  --shadow-lg:0 8px 36px rgba(27,42,59,.12);
  --transition:all .22s ease;
}

*{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:1200px;margin:0 auto;padding:0 32px}


/* ── Hero — two-column: text + image ── */
.hero{background:linear-gradient(165deg,#152840 0%,#1e3d5a 35%,#244868 65%,#1a3550 100%);padding:80px 0 64px;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;bottom:0;left:0;right:0;height:100px;background:linear-gradient(to top,var(--bg),transparent);pointer-events:none;z-index:1}
.hero::after{content:'';position:absolute;top:-80px;right:-60px;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,rgba(74,144,196,.12) 0%,transparent 60%);pointer-events:none}
.hero-layout{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;position:relative;z-index:2}
.hero-badge{display:inline-flex;align-items:center;gap:7px;background:rgba(74,144,196,.12);border:1px solid rgba(74,144,196,.25);color:#a8d4f0;padding:6px 15px;border-radius:18px;font-size:12px;font-weight:700;margin-bottom:18px;letter-spacing:.5px;text-transform:uppercase}
.hero-badge .dot{width:6px;height:6px;border-radius:50%;background:#4ade80;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}

.hero h2{font-size:36px;font-weight:800;color:#fff;line-height:1.18;margin-bottom:14px;letter-spacing:-.5px}
.hero-sub{font-size:17px;color:#b8d2e4;line-height:1.7;margin-bottom:26px;max-width:560px}
.hero-specs{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:28px}
.hero-spec{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.1);padding:8px 16px;border-radius:4px;font-size:13px;color:#c0d8ea;font-weight:500;letter-spacing:.2px}
.hero-spec em{font-style:normal;color:#e8c870;font-weight:700}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.hero-img-wrap{position:relative}
.hero-img{display:block;width:100%;height:auto;border-radius:10px;box-shadow:0 8px 40px rgba(0,0,0,.25)}


/* ── Buttons ── */
.btn{display:inline-block;padding:14px 32px;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 14px rgba(74,144,196,.3)}
.btn-blue:hover{transform:translateY(-2px);box-shadow:0 6px 28px rgba(74,144,196,.4);color:#fff}
.btn-blue:focus-visible{outline:2px solid #a8d4f0;outline-offset:2px}
.cta-section .btn-blue{padding:16px 40px;font-size:16px;letter-spacing:.2px}
.cta-section .btn-blue:hover{animation:cta-pulse .6s ease}
@keyframes cta-pulse{0%{box-shadow:0 3px 14px rgba(74,144,196,.3)}50%{box-shadow:0 6px 36px rgba(74,144,196,.5)}100%{box-shadow:0 3px 14px rgba(74,144,196,.3)}}
.btn-outline{background:transparent;color:#c0d8ea;border:1.5px solid rgba(255,255,255,.2)}
.btn-outline:hover{border-color:#a8d4f0;color:#fff}


/* ── Sections ── */
.section{padding:64px 0}
.section-alt{background:var(--bg-alt)}
.section-deep{background:var(--bg-deep);color:#c8dce8}
.section-deep h2{color:#fff}
.section-deep .section-desc{color:#9ab8d0}

.section-label{display:inline-block;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:1.8px;color:var(--blue);margin-bottom:10px;padding:4px 12px;background:var(--blue-light);border-radius:12px}

h2{font-size:26px;font-weight:700;color:var(--text-primary);margin-bottom:10px;letter-spacing:-.2px;line-height:1.3}
h3{font-size:17px;font-weight:600;color:var(--text-primary);margin-bottom:6px}
.section-desc{font-size:17px;color:var(--text-secondary);margin-bottom:32px;max-width:860px;line-height:1.65}
.section-desc--center{margin-left:auto;margin-right:auto;text-align:center}
.section-desc--narrow{max-width:680px;margin-left:auto;margin-right:auto;text-align:center}


/* ── Key Answer Block — GEO-friendly direct answer ── */
.answer-block{background:var(--bg-card);border:1px solid var(--border);border-left:4px solid var(--blue);border-radius:var(--radius);padding:22px 26px;margin-bottom:28px;box-shadow:var(--shadow-md)}
.answer-block .answer-label{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:1.2px;color:var(--blue);margin-bottom:8px}
.answer-block p{font-size:17px;color:var(--text-primary);line-height:1.7}
.answer-block strong{color:var(--blue-deep)}


/* ── Decision Table — wear application match ── */
.decision-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-md)}
.decision-table th{background:var(--blue-light);color:var(--blue-deep);font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.7px;padding:14px 18px;text-align:left}
.decision-table td{font-size:15px;padding:12px 18px;border-bottom:1px solid var(--border-subtle);color:var(--text-secondary)}
.decision-table td:first-child{color:var(--text-primary);font-weight:600}
.decision-table tr:last-child td{border-bottom:none}
.decision-table tr:hover td{background:var(--blue-light)}
.decision-table .caution{color:var(--amber);font-weight:600}
.decision-table .warning{color:var(--red);font-weight:600}


/* ── Wear Type Cards — 2-column for better readability ── */
.wear-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.wear-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px 22px;border-top:3px solid var(--blue);box-shadow:var(--shadow);transition:var(--transition)}
.wear-card:hover{border-color:var(--blue);box-shadow:var(--shadow-md);transform:translateY(-2px)}
.wear-card .wear-icon{width:44px;height:44px;border-radius:50%;background:var(--blue-light);display:flex;align-items:center;justify-content:center;font-size:20px;color:var(--blue);margin-bottom:14px;font-weight:800}
.wear-card h3{font-size:17px;margin-bottom:8px}
.wear-card p{font-size:15px;color:var(--text-secondary);line-height:1.6}
.wear-card .wear-tag{display:inline-block;margin-top:12px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--blue);background:var(--blue-light);padding:4px 12px;border-radius:12px}


/* ── Alloy Comparison — 4-card with data strip ── */
.alloy-row{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.alloy-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);transition:var(--transition)}
.alloy-card:hover{border-color:var(--blue);box-shadow:var(--shadow-md);transform:translateY(-2px)}
.alloy-head{padding:16px 18px;border-bottom:1px solid var(--border-subtle);background:var(--blue-light)}
.alloy-head h3{font-size:18px;margin-bottom:2px}
.alloy-head .hb{font-size:13px;color:var(--blue);font-weight:700;letter-spacing:.3px}
.alloy-body{padding:16px 18px}
.alloy-body .why{font-size:14px;color:var(--text-secondary);line-height:1.55;margin-bottom:10px}
.alloy-body .limit{font-size:13px;color:var(--amber);line-height:1.5;padding:8px 10px;background:var(--amber-light);border:1px solid var(--amber-border);border-radius:4px}
.alloy-body .use{font-size:12px;color:var(--text-muted);margin-top:8px;font-style:italic}
.alloy-note{margin-top:18px;font-size:15px;color:var(--text-secondary);line-height:1.6;padding:18px 22px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);border-left:4px solid var(--blue);box-shadow:var(--shadow)}


/* ── Side-by-Side Comparison — Bare vs Hard-Anodized ── */
.compare-layout{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;background:var(--bg-card);box-shadow:var(--shadow-md)}
.compare-col{padding:28px 24px}
.compare-col:first-child{border-right:2px solid var(--border)}
.compare-col h3{font-size:18px;margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--border-subtle)}
.compare-col:first-child h3{border-bottom-color:var(--steel)}
.compare-col:last-child h3{border-bottom-color:var(--blue)}
.compare-row{display:grid;grid-template-columns:140px 1fr;gap:8px;padding:10px 0;border-bottom:1px solid var(--border-subtle);font-size:14px}
.compare-row:last-child{border-bottom:none}
.compare-row .label{color:var(--text-muted);font-weight:600;font-size:13px}
.compare-row .val{color:var(--text-secondary)}
.compare-col:last-child .compare-row .val{color:var(--blue-deep);font-weight:500}
.compare-advantage{background:var(--green-light);border:1px solid var(--green-border);border-radius:4px;padding:12px 16px;margin-top:16px;font-size:14px;color:var(--green)}


/* ── Type II vs III — dual column with badge ── */
.type-duel{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.type-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);transition:var(--transition)}
.type-card:hover{border-color:var(--blue);box-shadow:var(--shadow-md)}
.type-badge{padding:14px 20px;font-size:14px;font-weight:700;letter-spacing:.3px;text-transform:uppercase}
.type-badge--ii{background:var(--bg-alt);color:var(--steel)}
.type-badge--iii{background:var(--blue);color:#fff}
.type-body{padding:18px 20px}
.type-row{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--border-subtle);font-size:14px}
.type-row:last-child{border-bottom:none}
.type-row .t-label{color:var(--text-muted);font-weight:600}
.type-row .t-val{color:var(--text-secondary);text-align:right;max-width:55%}
.type-card:last-child .type-row .t-val{color:var(--blue-deep);font-weight:500}


/* ── Dimensional Effect — visual diagram + explanation ── */
.dim-layout{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}
.dim-diagram{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px 24px;text-align:center;box-shadow:var(--shadow-md)}
.dim-diagram .layer{padding:12px 16px;margin:6px auto;max-width:320px;border-radius:var(--radius);font-size:14px;font-weight:600}
.dim-diagram .layer-substrate{background:#e8eff6;border:2px dashed var(--blue);color:var(--blue-deep)}
.dim-diagram .layer-oxide{background:rgba(74,144,196,.12);border:2px solid var(--blue);color:var(--blue)}
.dim-diagram .layer-buildup{background:var(--amber-light);border:2px dashed var(--amber);color:var(--amber);font-size:13px}
.dim-diagram .arrow-down{font-size:20px;color:var(--blue);margin:4px 0}
.dim-explain{font-size:15px;color:var(--text-secondary);line-height:1.65}
.dim-explain ul{list-style:none;margin-top:12px}
.dim-explain li{font-size:14px;padding:6px 0;border-bottom:1px solid var(--border-subtle)}
.dim-explain li:last-child{border-bottom:none}
.dim-explain li::before{content:'→ ';color:var(--blue);font-weight:700}
.dim-callout{background:var(--amber-light);border:1px solid var(--amber-border);border-radius:var(--radius);padding:16px 20px;margin-top:16px;font-size:14px;color:var(--amber);line-height:1.6}


/* ── Bearing Bore Flow — vertical decision path ── */
.bore-flow{display:flex;flex-direction:column;gap:0;max-width:640px;margin:0 auto}
.bore-step{display:flex;align-items:center;gap:16px;padding:18px 22px;background:var(--bg-card);border:1px solid var(--border);transition:var(--transition)}
.bore-step:first-child{border-radius:var(--radius-lg) var(--radius-lg) 0 0}
.bore-step:last-child{border-radius:0 0 var(--radius-lg) var(--radius-lg);border-bottom:1px solid var(--border)}
.bore-step:not(:last-child){border-bottom:none}
.bore-step:hover{background:var(--blue-light)}
.bore-num{width:34px;height:34px;border-radius:50%;background:var(--blue);color:#fff;font-size:14px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.bore-step p{font-size:15px;color:var(--text-primary);font-weight:500}
.bore-note{margin-top:18px;font-size:15px;color:var(--text-secondary);line-height:1.65;padding:18px 22px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);border-left:4px solid var(--blue);box-shadow:var(--shadow-md)}


/* ── Tribology Factor Grid — factors that affect wear ── */
.trib-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.trib-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:18px 16px;text-align:center;box-shadow:var(--shadow);transition:var(--transition)}
.trib-item:hover{border-color:var(--blue);transform:translateY(-1px)}
.trib-item .t-icon{font-size:24px;margin-bottom:8px;display:block;color:var(--blue)}
.trib-item p{font-size:14px;color:var(--text-secondary);font-weight:500}
.trib-note{margin-top:18px;font-size:15px;color:var(--text-secondary);line-height:1.65;padding:18px 22px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);border-left:4px solid var(--amber);box-shadow:var(--shadow)}


/* ── Mating Surface — 2x2 cards ── */
.mate-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.mate-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:22px 20px;border-left:3px solid var(--blue);box-shadow:var(--shadow);transition:var(--transition)}
.mate-card:hover{border-color:var(--blue);box-shadow:var(--shadow-md);transform:translateY(-1px)}
.mate-card h3{font-size:16px;margin-bottom:8px;color:var(--blue-deep)}
.mate-card p{font-size:15px;color:var(--text-secondary);line-height:1.55}


/* ── Warning / Caution / Alternative Callout Blocks ── */
.callout{border-radius:var(--radius);padding:18px 22px;margin:18px 0;font-size:15px;line-height:1.6;box-shadow:var(--shadow)}
.callout--warn{background:var(--red-light);border:1px solid var(--red-border);color:var(--red)}
.callout--caution{background:var(--amber-light);border:1px solid var(--amber-border);color:var(--amber)}
.callout--good{background:var(--green-light);border:1px solid var(--green-border);color:var(--green)}
.callout--info{background:var(--blue-light);border:1px solid rgba(74,144,196,.15);color:var(--blue-deep)}
.callout strong{display:block;margin-bottom:4px;font-size:14px;text-transform:uppercase;letter-spacing:.5px}


/* ── When Not Aluminum — alternative material table ── */
.alt-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-md)}
.alt-table th{background:var(--red-light);color:var(--red);font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.7px;padding:14px 18px;text-align:left}
.alt-table td{font-size:15px;padding:12px 18px;border-bottom:1px solid var(--border-subtle);color:var(--text-secondary)}
.alt-table td:first-child{color:var(--text-primary);font-weight:600}
.alt-table tr:last-child td{border-bottom:none}
.alt-table tr:hover td{background:var(--blue-light)}


/* ── Component List — 3-column wear-mechanism keyed ── */
.comp-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:18px}
.comp-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:22px 20px;border-top:3px solid var(--blue);box-shadow:var(--shadow);transition:var(--transition)}
.comp-card:hover{border-color:var(--blue);box-shadow:var(--shadow-md);transform:translateY(-2px)}
.comp-card h3{font-size:16px;margin-bottom:8px}
.comp-card .comp-wear{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--amber);margin-bottom:8px}
.comp-card ul{list-style:none}
.comp-card li{font-size:14px;color:var(--text-secondary);padding:3px 0;line-height:1.45}
.comp-card li::before{content:'› ';color:var(--blue);font-weight:700}


/* ── CNC Process — 3-column grid (2 rows) ── */
.process-flow{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--border);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-md)}
.process-step{padding:24px 20px;background:var(--bg-card);text-align:center;transition:var(--transition)}
.process-step:hover{background:var(--blue-light)}
.process-step .p-num{font-size:11px;font-weight:700;color:var(--blue);text-transform:uppercase;letter-spacing:.5px;margin-bottom:10px}
.process-step h3{font-size:15px;margin-bottom:6px;line-height:1.3}
.process-step p{font-size:13px;color:var(--text-secondary);line-height:1.5}


/* ── Masking — two-column: what to mask + why ── */
.mask-layout{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start}
.mask-list{list-style:none}
.mask-list li{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid var(--border-subtle);font-size:15px;color:var(--text-primary)}
.mask-list li:last-child{border-bottom:none}
.mask-list .m-icon{color:var(--amber);font-size:16px;font-weight:700;flex-shrink:0}
.mask-explain{font-size:15px;color:var(--text-secondary);line-height:1.65;padding:24px 26px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);border-left:4px solid var(--amber);box-shadow:var(--shadow-md)}


/* ── Inspection — 3+2 grid for clarity ── */
.inspect-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.inspect-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px 16px;text-align:center;box-shadow:var(--shadow);transition:var(--transition)}
.inspect-item:hover{border-color:var(--blue);box-shadow:var(--shadow-md);transform:translateY(-1px)}
.inspect-item .i-icon{font-size:24px;margin-bottom:8px;display:block;color:var(--blue)}
.inspect-item p{font-size:14px;color:var(--text-secondary);font-weight:500;line-height:1.45}
.inspect-note{margin-top:18px;font-size:14px;color:var(--text-muted);font-style:italic;text-align:center}


/* ── Drawing Spec — structured fields ── */
.spec-fields{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;background:var(--bg-card);box-shadow:var(--shadow-md)}
.spec-field{display:grid;grid-template-columns:160px 1fr;gap:0;border-bottom:1px solid var(--border-subtle);border-right:1px solid var(--border-subtle)}
.spec-field:nth-child(2n){border-right:none}
.spec-field:nth-last-child(-n+2){border-bottom:none}
.spec-field .sf-label{padding:12px 16px;font-size:13px;font-weight:700;color:var(--blue-deep);text-transform:uppercase;letter-spacing:.3px;background:var(--blue-light);border-right:1px solid var(--border-subtle)}
.spec-field .sf-value{padding:12px 16px;font-size:15px;color:var(--text-secondary)}


/* ── Cost Layout — two-column: formula + TCO note ── */
.cost-layout{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start}
.cost-formula{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px 24px;box-shadow:var(--shadow-md)}
.cost-item{display:flex;align-items:center;gap:10px;padding:8px 0;font-size:15px;color:var(--text-secondary)}
.cost-plus{color:var(--blue);font-weight:300;font-size:18px;flex-shrink:0}
.cost-item:last-child .cost-plus{display:none}
.cost-tco{font-size:15px;color:var(--text-secondary);line-height:1.65;padding:24px 22px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);border-left:4px solid var(--amber);box-shadow:var(--shadow-md)}
.cost-tco strong{color:var(--amber)}


/* ── Case Study — block with details ── */
.case-block{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-md)}
.case-head{padding:22px 26px;border-bottom:1px solid var(--border-subtle);background:var(--blue-light)}
.case-head .tag{display:inline-block;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--blue);margin-bottom:4px}
.case-head h3{font-size:18px}
.case-body{padding:24px 26px}
.case-grid{display:grid;grid-template-columns:1fr 1fr;gap:0}
.case-row{display:flex;gap:8px;padding:10px 0;border-bottom:1px solid var(--border-subtle);font-size:14px;padding-right:24px}
.case-row:last-child{border-bottom:none}
.case-row .label{color:var(--text-muted);font-weight:600;min-width:140px;flex-shrink:0}
.case-row .value{color:var(--text-secondary)}
.case-note{margin-top:14px;font-size:13px;color:var(--text-muted);font-style:italic}


/* ── Decision Summary Table ── */
.choice-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-md)}
.choice-table th{background:var(--blue-light);color:var(--blue-deep);font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.7px;padding:14px 18px;text-align:left}
.choice-table td{font-size:15px;padding:12px 18px;border-bottom:1px solid var(--border-subtle);color:var(--text-secondary)}
.choice-table td:first-child{color:var(--text-primary);font-weight:600;min-width:200px}
.choice-table tr:last-child td{border-bottom:none}
.choice-table tr:hover td{background:var(--blue-light)}


/* ── Internal Links ── */
.int-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.int-links a{background:var(--bg-card);border:1px solid var(--border);padding:7px 16px;border-radius:4px;font-size:13px;color:var(--text-secondary);transition:var(--transition)}
.int-links a:hover{border-color:var(--blue);color:var(--blue)}


/* ── FAQ ── */
.faq-list{margin-top:4px}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:8px;background:var(--bg-card);overflow:hidden;transition:var(--transition)}
.faq-item:hover{border-color:var(--border-hover)}
.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;gap:12px}
.faq-q::after{content:'+';font-size:18px;color:var(--blue);flex-shrink:0;font-weight:300;transition:var(--transition)}
.faq-item.open .faq-q::after{content:'−'}
.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}


/* ── CTA — enhanced with trust signals ── */
.cta-section{background:linear-gradient(170deg,#152840 0%,#1e3d5a 40%,#244868 70%,#1a3550 100%);padding:80px 0;text-align:center;position:relative;overflow:hidden}
.cta-section::before{content:'';position:absolute;top:-80px;left:50%;transform:translateX(-50%);width:500px;height:500px;border-radius:50%;background:radial-gradient(circle,rgba(74,144,196,.12) 0%,transparent 65%);pointer-events:none}
.cta-section::after{content:'';position:absolute;bottom:0;left:0;right:0;height:80px;background:linear-gradient(to top,var(--bg),transparent);pointer-events:none;z-index:1}
.cta-section h2{color:#fff;font-size:30px;margin-bottom:10px;position:relative;z-index:2}
.cta-section .section-desc{color:#b8d2e4;margin:0 auto 32px;max-width:680px;position:relative;z-index:2}
.cta-trust{display:flex;justify-content:center;gap:24px;flex-wrap:wrap;margin-top:24px;position:relative;z-index:2}
.cta-trust-item{display:flex;align-items:center;gap:6px;font-size:13px;color:#8ab4d4}
.cta-trust-item .trust-dot{width:5px;height:5px;border-radius:50%;background:#4ade80;flex-shrink:0}
.cta-trust-item .trust-dot--amber{background:#e8c870}
.cta-trust-item .trust-dot--blue{background:#a8d4f0}


/* ── GEO Summary — deep background ── */
.geo-summary{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:var(--radius-lg);padding:28px 30px;margin:0 auto;max-width:100%}
.geo-summary h3{color:#e8c870;font-size:15px;margin-bottom:14px;font-weight:700;text-transform:uppercase;letter-spacing:.8px}
.geo-item{padding:10px 0;border-bottom:1px solid rgba(255,255,255,.06);font-size:15px;color:#b8d2e4;line-height:1.6}
.geo-item:last-child{border-bottom:none}
.geo-item strong{color:#e8c870;font-weight:600}
.geo-item .geo-q{display:block;font-size:14px;color:#7a9bb8;margin-bottom:4px;font-weight:600}


/* ── Footer ── */
.footer{background:var(--bg-alt);padding:24px 0;text-align:center;border-top:1px solid var(--border)}
.footer p{font-size:13px;color:var(--text-muted)}
.footer a{color:var(--text-secondary)}


/* ── Section Images ── */
.section-img{display:block;max-width:100%;height:auto;border-radius:var(--radius-lg);margin:0 auto 24px;box-shadow:var(--shadow-md)}
.img-comparison{display:block;max-width:840px;width:100%;height:auto;border-radius:var(--radius-lg);margin:0 auto 28px;box-shadow:var(--shadow-md)}
.img-caption{text-align:center;font-size:13px;color:var(--text-muted);margin:-12px auto 24px;font-style:italic;max-width:720px}


/* ── Two-column section grid ── */
.section-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:start}
.section-grid--wide-l{grid-template-columns:1.2fr 0.8fr}
.section-grid--wide-r{grid-template-columns:0.8fr 1.2fr}


/* ── Surface Roughness list style (replaces inline) ── */
.sr-list{list-style:none;margin-bottom:18px}
.sr-list li{font-size:15px;padding:7px 0;color:var(--text-secondary)}
.sr-list li::before{content:'→ ';color:var(--blue);font-weight:700}
.sr-intro{font-size:15px;color:var(--text-secondary);line-height:1.65;margin-bottom:18px}
.sr-note{font-size:13px;color:var(--text-muted);margin-top:14px;font-style:italic}


/* ── Utility ── */
.text-center{text-align:center}
.mt16{margin-top:16px}
.mt20{margin-top:20px}
.mt28{margin-top:28px}
.mx-auto{margin-left:auto;margin-right:auto}


/* ── Responsive ── */
@media(max-width:1024px){
  .hero-layout{grid-template-columns:1fr;text-align:center}
  .hero-sub{margin-left:auto;margin-right:auto}
  .hero-specs{justify-content:center}
  .hero-actions{justify-content:center}
  .hero-img-wrap{max-width:560px;margin:0 auto}
  .section-grid,.section-grid--wide-l,.section-grid--wide-r{grid-template-columns:1fr}
  .compare-layout{grid-template-columns:1fr}
  .compare-col:first-child{border-right:none;border-bottom:2px solid var(--border)}
  .type-duel{grid-template-columns:1fr}
  .dim-layout{grid-template-columns:1fr}
  .wear-grid{grid-template-columns:1fr 1fr}
  .alloy-row{grid-template-columns:1fr 1fr}
  .trib-grid{grid-template-columns:repeat(3,1fr)}
  .mate-row{grid-template-columns:1fr 1fr}
  .comp-grid{grid-template-columns:1fr 1fr}
  .process-flow{grid-template-columns:repeat(3,1fr)}
  .inspect-grid{grid-template-columns:repeat(3,1fr)}
  .spec-fields{grid-template-columns:1fr}
  .spec-field:nth-child(2n){border-right:1px solid var(--border-subtle)}
  .cost-layout{grid-template-columns:1fr}
  .case-grid{grid-template-columns:1fr}
  .mask-layout{grid-template-columns:1fr}
}
@media(max-width:640px){
  .hero{padding:52px 0 40px}
  .hero h2{font-size:26px}
  .hero-layout{gap:28px}
  .section{padding:44px 0}
  .container{padding:0 16px}
  .wear-grid{grid-template-columns:1fr}
  .alloy-row{grid-template-columns:1fr}
  .trib-grid{grid-template-columns:repeat(2,1fr)}
  .mate-row{grid-template-columns:1fr}
  .comp-grid{grid-template-columns:1fr}
  .process-flow{grid-template-columns:1fr}
  .inspect-grid{grid-template-columns:repeat(2,1fr)}
  .bore-flow{max-width:100%}
  .cta-trust{gap:12px}
  .cta-trust-item{font-size:12px}
}