:root{--bg:#fbfbf9;--surface:#fcfcfb;--text:#1c1917;--text-muted:#666e7d;--border:#e2e5ea;--accent:#2f6fed;--accent-weak:#eaf1ff;--shadow:0 1px 2px rgba(16,24,40,0.04),0 8px 24px rgba(16,24,40,0.06);--radius:20px;--space-1:8px;--space-2:13px;--space-3:21px;--space-4:34px;--space-5:55px}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;font-size:16px;line-height:1.5;min-height:100vh;display:flex;flex-direction:column}
main{flex:1;width:100%;max-width:880px;margin:0 auto;padding:var(--space-3) var(--space-2)}
h1{font-size:28px;line-height:1.2;margin:0 0 var(--space-2)}
h2{font-size:20px;line-height:1.3;margin:var(--space-4) 0 var(--space-1)}
h3{font-size:16px;line-height:1.4;margin:var(--space-2) 0 var(--space-1)}
p{margin:0 0 var(--space-2)}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}


/* Topnav + brand — mirrors d4t0 portal pattern (home/style.css .menu, .menu-btn).
   Two nested boxes, same pattern as main -> article below: the outer box
   matches main's 880px+padding exactly, and .cy-topnav-inner matches
   article's 760px cap, so the logo/pill align with the page's actual
   text column instead of main's wider padded box. */
.cy-topnav{padding:var(--space-2) var(--space-2);max-width:880px;margin:0 auto;width:100%}
.cy-topnav-inner{display:flex;align-items:center;justify-content:space-between;max-width:760px;margin:0 auto;width:100%}
.cy-logo{display:flex;align-items:center;gap:8px;color:var(--text)}
/* The box is 25.5×25.5; the rotate(45deg) inflates the AABB to
   25.5 × √2 ≈ 36.06 — visually identical to the 36px nav
   buttons (cy-menu-btn / cy-lang-switch). Without this compensation
   the rotated diamond reads as a 51px box and dwarfs the buttons
   next to it. (Round the box size to 25.5 to land on exactly 36
   after rotation.) */
.cy-logo-mark{width:25.5px;height:25.5px;display:inline-block;background-color:var(--text);-webkit-mask-image:url("/logo.svg");mask-image:url("/logo.svg");-webkit-mask-repeat:no-repeat;mask-repeat:no-repeat;-webkit-mask-size:contain;mask-size:contain;transform:rotate(45deg)}
/* Apple-style floating pill: the language switch and the hamburger
   button share one rounded background, one border, one shadow.
   Inner buttons drop their own borders so the pill reads as a
   single control cluster. Border-radius 18 (half of 36 height)
   makes the ends fully rounded. The shadow is a two-layer
   ambient (sharp contact + soft falloff) tuned to feel light
   against the warm off-white background. The 1px divider
   between the two inner items comes from a 1px left border on
   the menu button.

   NO "overflow: hidden" here — the dropdown menu panel is an
   absolutely-positioned child of the pill (right: 0; top:
   calc(100% + 8px)) and would be clipped by it. The visual
   rounding is achieved by giving each inner control its own
   border-radius at the correct corner (17 = 18 - 1.5px border). */
.cy-actions-pill{display:flex;align-items:center;background:var(--surface);border:1.5px solid var(--border);border-radius:18px;box-shadow:0 1px 1.5px rgba(0,0,0,.03),0 3px 8px rgba(0,0,0,.04)}
.cy-lang-switch{display:flex;align-items:center;gap:5px;padding:0 12px;height:36px;border-radius:17px 0 0 17px;color:var(--text-muted);font-size:13px;font-weight:500;transition:color .15s;text-decoration:none}
.cy-lang-switch:hover{color:var(--accent);text-decoration:none}
.cy-lang-switch svg{flex:none}
.cy-menu{position:relative}
.cy-menu-btn{position:relative;width:44px;height:36px;background:transparent;border:none;border-left:1px solid var(--border);border-radius:0 17px 17px 0;cursor:pointer;padding:0;display:flex;align-items:center;justify-content:center;transition:background .15s}
.cy-menu-btn:hover{background:var(--bg)}
.cy-menu-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.cy-menu-btn span{position:absolute;left:50%;top:50%;display:block;width:16px;height:1.5px;margin:-0.75px 0 0 -8px;background:var(--text);border-radius:1px;transition:transform .15s}
.cy-menu-btn span:nth-child(1){transform:translateY(-4px)}
.cy-menu-btn span:nth-child(2){transform:translateY(3px)}
.cy-menu-btn[aria-expanded="true"]{background:var(--accent-weak)}
.cy-menu-btn[aria-expanded="true"] span{background:var(--accent)}
.cy-menu-btn[aria-expanded="true"] span:nth-child(1){transform:rotate(45deg)}
.cy-menu-btn[aria-expanded="true"] span:nth-child(2){transform:rotate(-45deg)}
.cy-menu-panel{position:absolute;right:0;top:calc(100% + 8px);min-width:200px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:8px;display:flex;flex-direction:column;gap:4px;z-index:50}
/* CLAUDE.md gotcha #1: explicit hidden override — without this,
   .cy-menu-panel { display: flex } silently wins over the UA default
   [hidden] { display: none } and the menu is always visible. */
.cy-menu-panel[hidden]{display:none}
.cy-menu-panel a{padding:8px 12px;border-radius:6px;color:var(--text);font-size:14px}
.cy-menu-panel a:hover{background:var(--accent-weak);text-decoration:none;color:var(--accent)}
.cy-menu-panel a.active{background:var(--accent-weak);color:var(--accent);font-weight:500}
.cy-menu-divider{height:1px;background:var(--border);margin:4px 0}

/* Footer */
.cy-footer{padding:var(--space-3) var(--space-2);text-align:center;color:var(--text-muted);font-size:13px;border-top:1px solid var(--border);background:var(--bg);margin-top:auto}
.cy-footer p{margin:0}
.cy-footer-copyright{margin-bottom:4px}
.cy-footer a{color:var(--text-muted)}
.cy-footer a:hover{color:var(--text)}

/* Article */
article{max-width:760px;margin:0 auto}
.cy-lede{font-size:18px;line-height:1.5;color:var(--text-muted)}

/* Calculator */
.cy-calc{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:var(--space-3);box-shadow:var(--shadow);margin:var(--space-3) 0}
.cy-modes{display:flex;gap:4px;margin-bottom:var(--space-2);flex-wrap:wrap}
.cy-mode{padding:8px 12px;border:1px solid transparent;border-radius:6px;background:var(--bg);color:var(--text);cursor:pointer;font-size:14px}
.cy-mode.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.cy-shapes{display:grid;grid-template-columns:repeat(6,1fr);gap:6px;margin-bottom:var(--space-2)}
@media (max-width:600px){.cy-shapes{grid-template-columns:repeat(4,1fr)}}
/* Border only on the active tile (a meaningful signal), not on all 12 —
   a 1px solid on every tile in a 6x2 grid reads as a wall of boxes.
   transparent (not "none") keeps the same box size so nothing shifts
   when a tile becomes active. */
.cy-shape{display:flex;flex-direction:column;align-items:center;padding:6px;border:1px solid transparent;border-radius:8px;background:var(--bg);color:var(--text-muted);cursor:pointer;font-size:11px;gap:2px}
.cy-shape.active{background:var(--accent-weak);border-color:var(--accent);color:var(--accent)}
.cy-shape svg{width:24px;height:24px}
.cy-shape-label{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}
.cy-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:var(--space-2);margin-bottom:var(--space-2)}
.cy-grid-3{grid-template-columns:repeat(auto-fit,minmax(120px,1fr))}
.cy-field{display:flex;flex-direction:column;gap:4px}
.cy-field-label{font-size:12px;color:var(--text-muted);font-weight:500}
.cy-field-row{display:flex;align-items:center;gap:6px;background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:6px 10px}
.cy-field-row input,.cy-field-row select{flex:1;border:none;background:none;font:inherit;color:var(--text);outline:none;min-width:0;padding:0}
.cy-field-row input:focus-visible,.cy-field-row select:focus-visible{outline:2px solid var(--accent);outline-offset:1px;border-radius:4px}
.cy-field-unit{color:var(--text-muted);font-size:14px;white-space:nowrap}
.cy-more{margin-bottom:var(--space-2);padding:var(--space-2);background:var(--bg);border:1px solid var(--border);border-radius:8px}
.cy-more summary{cursor:pointer;font-weight:500;color:var(--text-muted)}
.cy-results{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:var(--space-2);margin-top:var(--space-2)}
.cy-results.is-empty{opacity:0.5}
.cy-result-primary{display:flex;align-items:baseline;gap:8px;padding-bottom:var(--space-2);border-bottom:1px solid var(--border);margin-bottom:var(--space-1)}
.cy-result-primary .cy-result-label{color:var(--text-muted);font-size:14px}
.cy-result-primary .cy-result-value{font-size:36px;font-weight:600;font-variant-numeric:tabular-nums;color:var(--text);line-height:1.1}
.cy-result-primary .cy-result-unit{color:var(--text-muted);font-size:18px}
.cy-result-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:4px 16px}
.cy-result-list li{display:flex;justify-content:space-between;gap:8px;padding:4px 0;border-bottom:1px dashed var(--border);font-size:14px}
.cy-result-list li span{color:var(--text-muted)}
.cy-result-list li strong{color:var(--text);font-weight:500;font-variant-numeric:tabular-nums}
.cy-coverage{margin-top:var(--space-2);padding-top:var(--space-2);border-top:1px solid var(--border)}
.cy-coverage h3{font-size:14px;color:var(--text-muted);margin:0 0 6px}
.cy-coverage ul{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:6px}
.cy-coverage li{background:var(--accent-weak);color:var(--accent);padding:4px 10px;border-radius:6px;font-size:13px;font-variant-numeric:tabular-nums}
.cy-actions{display:flex;gap:8px;margin-top:var(--space-2);flex-wrap:wrap}
.cy-btn{padding:8px 14px;border:1px solid var(--accent);border-radius:6px;background:var(--accent);color:#fff;cursor:pointer;font-size:14px}
.cy-btn:hover{background:#1d4fb0;border-color:#1d4fb0}
.cy-btn-secondary{background:transparent;color:var(--text);border-color:var(--border)}
.cy-btn-secondary:hover{background:var(--bg);color:var(--text);border-color:var(--text-muted)}

/* Converter (for conversion pages) */
.cy-conv{display:flex;align-items:end;gap:var(--space-2);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:var(--space-3);box-shadow:var(--shadow);margin:var(--space-2) 0}
.cy-conv-eq{font-size:24px;color:var(--text-muted);padding-bottom:8px}
.cy-conv-result{display:flex;flex-direction:column;gap:4px;flex:1}
.cy-conv-result .cy-result-value{font-size:32px;font-weight:600;font-variant-numeric:tabular-nums}

/* Tables */
.cy-table{width:100%;border-collapse:collapse;margin:var(--space-2) 0;font-size:14px}
.cy-table caption{text-align:left;padding:6px 0;color:var(--text-muted);font-size:13px}
.cy-table th,.cy-table td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--border)}
.cy-table th{color:var(--text-muted);font-weight:500;font-size:12px;text-transform:uppercase;letter-spacing:0.04em}
.cy-table tbody tr:hover{background:var(--bg)}

/* Card grid (hubs) */
.cy-hub-list{list-style:none;padding:0;margin:var(--space-2) 0;display:flex;flex-wrap:wrap;gap:6px 16px}
.cy-hub-list li{margin:0}
.cy-hub-list a{color:var(--accent);text-decoration:none}
.cy-hub-list a:hover{text-decoration:underline}

/* Mat/conv/guide grids on home */
.cy-mat-grid,.cy-conv-grid,.cy-guide-grid{list-style:none;padding:0;margin:var(--space-2) 0;display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:6px}
.cy-mat-grid li,.cy-conv-grid li,.cy-guide-grid li{padding:4px 0}
.cy-mat-grid a,.cy-conv-grid a,.cy-guide-grid a{display:block;color:var(--text);font-weight:500}
.cy-mat-grid a:hover,.cy-conv-grid a:hover,.cy-guide-grid a:hover{color:var(--accent)}

/* Collapsible content sections (below the calculator) — icon + heading in
   <summary>, chevron rotates on open. Native <details>, zero JS. */
.cy-section{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);margin:var(--space-2) 0;overflow:hidden}
.cy-section summary{display:flex;align-items:center;gap:10px;padding:var(--space-2) var(--space-3);cursor:pointer;font-weight:500;list-style:none}
.cy-section summary::-webkit-details-marker{display:none}
.cy-section-icon{flex:none;display:flex;color:var(--text-muted)}
.cy-section-title{flex:1;min-width:0}
.cy-section-hint{font-weight:400;color:var(--text-muted);font-size:13px}
.cy-section-chevron{flex:none;display:flex;color:var(--text-muted);transition:transform .15s}
.cy-section[open] .cy-section-chevron{transform:rotate(180deg)}
.cy-section[open] summary{border-bottom:1px solid var(--border)}
.cy-section-body{padding:0 var(--space-3) var(--space-2)}
.cy-section-body>*:first-child{margin-top:var(--space-2)}
.cy-section-body table{margin-bottom:0}
/* Several collapsible()s in a row (see src/templates/collapsible.ts
   sectionGroup()) share one outer border/background instead of stacking
   N separately-bordered cards — a wall of 4-5 rounded rectangles in a row
   reads as "too many borders" on a narrow mobile column. */
.cy-section-group{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);margin:var(--space-2) 0;overflow:hidden}
.cy-section-group .cy-section{background:none;border:none;border-radius:0;margin:0;border-bottom:1px solid var(--border)}
.cy-section-group .cy-section:last-child{border-bottom:none}

/* FAQ — one bordered card with a hairline divider between questions,
   not N separately-bordered/rounded boxes. */
.cy-faq{margin:var(--space-2) 0;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.cy-faq details{padding:0 var(--space-3);border-bottom:1px solid var(--border)}
.cy-faq details:last-child{border-bottom:none}
.cy-faq summary{cursor:pointer;font-weight:500;padding:var(--space-2) 0;list-style:none}
.cy-faq summary::after{content:"+";float:right;color:var(--text-muted)}
.cy-faq details[open] summary::after{content:"−"}
.cy-faq p{margin:0 0 var(--space-2);color:var(--text-muted);font-size:14px}

/* Variant */
.cy-variant-nav{display:flex;justify-content:space-between;gap:var(--space-2);margin-top:var(--space-3);padding-top:var(--space-2);border-top:1px solid var(--border);flex-wrap:wrap}

/* Print */
@media print{
  header.cy-topnav,footer.cy-footer,.cy-actions,.cy-more,.cy-modes,.cy-shapes,.cy-conv,.cy3d{display:none !important}
  .cy-calc,.cy-conv-page,.cy-table{border:none;box-shadow:none;background:#fff}
  .cy-result-primary .cy-result-value{font-size:24px}
  body{font-size:11pt}
  /* Collapsible sections print open regardless of on-screen state, and
     drop the interactive chrome (summary::marker is already hidden). */
  .cy-section{border:none;background:none}
  .cy-section-body{display:block !important;padding:0}
  .cy-section-chevron{display:none}
}

/* ─── Mobile (iPhone 14 / 390px baseline; also covers SE 375, Mini 375, Plus 428, Pro Max 430) ─── */
@media (max-width:640px){
  /* Container & type scale — give the calculator room to breathe on small screens */
  main{padding:16px 14px}
  h1{font-size:24px}
  h2{font-size:18px;margin-top:24px}
  h3{font-size:15px}
  p{font-size:15px}
  .cy-lede{font-size:16px}

  /* Topnav — the logo text "D4T0" wraps to two lines on narrow screens;
     the mask-image icon already shows in the placeholder, so hide the
     accessible text and let the icon speak. */
  .cy-logo{font-size:0}
  .cy-logo-mark{width:25.5px;height:25.5px}

  /* Lang switch: icon-only on narrow screens, drop the padding/gap the
     text label needed. */
  .cy-lang-switch{width:36px;padding:0;justify-content:center}
  .cy-lang-switch span{display:none}

  /* Collapsible sections: tighter padding to match the rest of the mobile pass. */
  .cy-section summary{padding:12px 14px;gap:8px}
  .cy-section-body{padding:0 14px 12px}

  /* Calculator primary result: 36px is fine on desktop, way too big for
     a 358px content column (the unit "yd³" gets pushed off the right edge). */
  .cy-result-primary .cy-result-value{font-size:24px}
  .cy-result-primary .cy-result-label{font-size:12px}
  .cy-result-primary .cy-result-unit{font-size:14px}

  /* Result list: 2-col grid (auto-fit minmax(180px,1fr)) leaves <170px per
     column on 390px viewports. "— half-ton pickups" doesn't fit. Stack
     to 1 column. */
  .cy-result-list{grid-template-columns:1fr;gap:0}

  /* Conversion page result: 32px is too big, "0.037" overflows the right edge. */
  .cy-conv-result .cy-result-value{font-size:22px}
  .cy-conv{display:flex-direction:column;align-items:stretch;gap:8px}
  .cy-conv-eq{align-self:center;transform:rotate(90deg);padding:0}

  /* Shape picker: 4 columns on small screens was right per v1, but the
     icon + label squeezed in 90px cells. Bump to 3 columns for legibility. */
  .cy-shapes{grid-template-columns:repeat(3,1fr);gap:6px}
  .cy-shape{padding:8px 4px}
  .cy-shape svg{width:22px;height:22px}
  .cy-shape-label{font-size:10px}

  /* Tables: shrink padding + font, and let the table itself scroll
     horizontally if the content is wider than the column (e.g. the
     homepage density chart and truck-capacity table). display:block
     makes the overflow-x: auto actually take effect on a <table>. */
  .cy-table{display:block;font-size:13px;overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%}
  .cy-table th,.cy-table td{padding:5px 8px;white-space:nowrap}
  .cy-table caption{font-size:12px}

  /* Hub card grids — let them stack to 1 column under 480px for the
     10-card materials hub. The auto-fit / minmax already does most of
     this; just tighten the gap. */
  .cy-mat-grid,.cy-conv-grid,.cy-guide-grid{gap:6px}
  .cy-mat-grid,.cy-conv-grid,.cy-guide-grid{grid-template-columns:1fr 1fr}

  /* Visual scale: 3 items at 390px is tight; the SVG icons are too big. */
  .cy-scale{gap:14px}
  .cy-scale li{align-items:center}
  .cy-scale-svg svg{width:48px;height:auto}

  /* Worked example cards: 1 column on mobile. */
  .cy-examples{grid-template-columns:1fr}

  /* Coverage chips in calculator result — wrap to 2 columns. */
  .cy-coverage ul{gap:4px}
  .cy-coverage li{font-size:12px;padding:3px 8px}

  /* FAQ: slightly tighter padding. */
  .cy-faq details{padding:10px 12px}

  /* Conversion "two-way converter" — stack the input + result vertically. */
  .cy-conv{flex-direction:column;align-items:stretch}

  /* Actions row: full-width buttons on mobile. */
  .cy-actions{flex-direction:column}
  .cy-btn{width:100%;padding:12px}

  /* "Pick a material" / hub link lists on homepage: stay 2-col, smaller
     font. */
  .cy-mat-grid a,.cy-conv-grid a,.cy-guide-grid a{font-size:13px}

  /* 3D preview on mobile: square still, just smaller (capped at 320px
     so it doesn't dominate the small screen). Aspect ratio reverts
     to 1:1 here because 16:9 on a 320px-wide phone would be a thin
     strip; centered again because there's no longer a wide canvas
     to fill. */
  .cy3d{max-width:320px;aspect-ratio:1;margin:8px auto 16px}
}

/* ── 3D shape preview (Three.js WebGL) ── */
.cy3d{position:relative;width:100%;aspect-ratio:16/9;margin:0;overflow:hidden;background:linear-gradient(180deg,var(--surface) 0%,var(--bg) 100%);touch-action:none}
.cy3d canvas{display:block;width:100%!important;height:100%!important;cursor:grab}
.cy3d canvas:active{cursor:grabbing}
.cy3d-controls{position:absolute;bottom:8px;right:8px;z-index:2}
.cy3d-controls button{appearance:none;background:var(--surface);border:1px solid var(--border);border-radius:6px;width:30px;height:30px;cursor:pointer;color:var(--text);font-size:14px;line-height:1;display:flex;align-items:center;justify-content:center;font-family:ui-monospace,SFMono-Regular,monospace;box-shadow:0 1px 2px rgba(0,0,0,0.06)}
.cy3d-controls button:hover{background:var(--accent-weak);color:var(--accent);border-color:var(--accent)}
.cy3d-controls button:focus-visible{outline:2px solid var(--accent);outline-offset:1px}
.cy3d-controls button.on{background:var(--accent);color:#fff;border-color:var(--accent)}

/* 3D preview — toolbar layout (reset + rotate + fullscreen + cross-section buttons) */
.cy3d-controls{display:flex;gap:4px}
.cy3d-controls button{appearance:none;background:var(--surface);border:1px solid var(--border);border-radius:6px;width:30px;height:30px;cursor:pointer;color:var(--text);font-size:14px;line-height:1;display:flex;align-items:center;justify-content:center;font-family:ui-monospace,SFMono-Regular,monospace;box-shadow:0 1px 2px rgba(0,0,0,0.06)}
.cy3d-controls button:hover{background:var(--accent-weak);color:var(--accent);border-color:var(--accent)}
.cy3d-controls button:focus-visible{outline:2px solid var(--accent);outline-offset:1px}
.cy3d-controls button.on{background:var(--accent);color:#fff;border-color:var(--accent)}
.cy3d-controls button svg{width:14px;height:14px}

/* 3D preview — fullscreen state */
.cy3d:fullscreen,.cy3d:-webkit-full-screen{border:none;border-radius:0;background:var(--surface);width:100vw !important;height:100vh !important;max-width:100vw !important;aspect-ratio:auto}
.cy3d:fullscreen canvas,.cy3d:-webkit-full-screen canvas{width:100% !important;height:100% !important}

/* 3D preview — loading skeleton (covers Three.js init lag; CSS-only, no JS) */
.cy3d-skeleton{position:absolute;inset:0;background:linear-gradient(90deg,var(--bg) 0%,var(--accent-weak) 50%,var(--bg) 100%);background-size:200% 100%;animation:cy3d-shimmer 1.4s ease-in-out infinite;z-index:1}
@keyframes cy3d-shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}
.cy3d-loaded .cy3d-skeleton{display:none}
@media (prefers-reduced-motion: reduce){.cy3d-skeleton{animation:none}}
/* WebGL unsupported fallback: keep skeleton visible and hide the now-meaningless chrome. */
.cy3d-not-supported .cy3d-controls,.cy3d-not-supported .cy3d-section-controls,.cy3d-not-supported .cy3d-labels{display:none}

/* 3D preview — cross-section controls (slider + label, top of canvas) */
.cy3d-section-controls{position:absolute;top:8px;left:8px;right:8px;display:flex;gap:8px;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:6px;padding:6px 8px;font-size:11px;color:var(--text-muted);z-index:2;pointer-events:auto;box-shadow:0 1px 2px rgba(0,0,0,0.06)}
.cy3d-section-controls input[type="range"]{flex:1;accent-color:var(--accent);min-width:0;height:14px}
.cy3d-section-controls span{font-variant-numeric:tabular-nums;min-width:36px;text-align:right}
.cy3d-section-controls span:first-of-type{color:var(--text);font-weight:500}

/* Round 8 layout: 3D preview lifted out of the main calculator card
   into its own card above it. The preview's mesh, controls, and labels
   are self-contained — we just give the card a frame and a small gap
   to the calculator card below. */
.cy-preview-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:var(--space-2);box-shadow:var(--shadow);margin:var(--space-3) 0}
.cy-preview-card .cy3d{margin:0 auto 0}

/* 3D preview — dimension labels (HTML overlay, repositions on camera move) */
.cy3d-labels{position:absolute;inset:0;pointer-events:none;z-index:3;overflow:hidden}
.cy3d-label-svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible;pointer-events:none}
.cy3d-label-line{stroke:var(--accent);stroke-width:1.2;fill:none;opacity:.65}
.cy3d-label-dot{fill:var(--accent);stroke:var(--surface);stroke-width:1.5;opacity:.9}
.cy3d-label{position:absolute;background:var(--surface);border:1px solid var(--accent-weak);border-radius:6px;padding:3px 8px;font-size:12px;line-height:1.2;color:var(--text);font-variant-numeric:tabular-nums;font-weight:500;pointer-events:none;transform:translate(-50%,-50%);box-shadow:0 1px 2px rgba(0,0,0,.08),0 0 0 3px rgba(47,111,237,.06);white-space:nowrap;z-index:3}
.cy3d-label::after{content:"";position:absolute;width:7px;height:7px;background:var(--accent);border:2px solid var(--surface);border-radius:50%;top:-7px;left:-7px;box-shadow:0 1px 2px rgba(0,0,0,.15)}

/* 3D preview — print rule (extend existing @media print block; .cy3d already hidden, but new controls must hide too) */
@media print{
  .cy3d-skeleton,.cy3d-label,.cy3d-labels,.cy3d-section-controls{display:none !important}
}

/* 3D preview — mobile (iPhone 390px baseline): toolbar compact, smaller labels */
@media (max-width:640px){
  .cy3d-controls{gap:3px}
  .cy3d-controls button{width:28px;height:28px}
  .cy3d-controls button svg{width:12px;height:12px}
  .cy3d-section-controls{font-size:10px;padding:4px 6px}
  .cy3d-label{font-size:10px;padding:1px 4px}
}