/* Rhino 3D guide — order-from-original of rhino3d.com (McNeel).
   Distinct architecture: fixed WHITE nav with two-tone "Rhino ceros" text lockup, HERO on
   #f0f0f0 canvas = cross-fading render slideshow + overlaid headline card with the signature
   RED RAISED gradient download button (0 4px #880000 shadow), floating white rounded cards,
   iOS-style New/Upgrade pricing toggle with rotated red "free" ribbon, dark Grasshopper band.
   Rhino red #901010 primary, Roboto. Deliberately NOT the KDE/Bootstrap/orange skeletons of
   our other sites. Editorial, non-impersonating (about-pattern schema + affiliate disclosure). */
:root{
  --red:#901010; --red-hover:#db1818; --grad-a:#d02718; --grad-b:#810e05; --red-deep:#880000;
  --canvas:#f0f0f0; --card:#fff; --ink:#111; --muted:#858585; --muted2:#4e4e4e; --line:#e4e4e4;
}
*{box-sizing:border-box}
::selection{background:#f9f953;color:#82868b}
body{margin:0;font-family:"Roboto","Segoe UI",system-ui,-apple-system,Arial,sans-serif;
  color:var(--ink);background:var(--canvas);line-height:1.5;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--red);text-decoration:none}a:hover{color:var(--red-hover)}
h1,h2,h3{font-weight:700;letter-spacing:-.01em}
.wrap{max-width:1110px;margin:0 auto;padding:0 22px}

/* ---- fixed white nav + two-tone text logo ---- */
.rh-nav{position:sticky;top:0;z-index:50;background:#fff;box-shadow:0 2px 4px -1px rgba(0,0,0,.25)}
.rh-nav .wrap{display:flex;align-items:center;gap:24px;height:62px}
.rh-logo{display:flex;flex-direction:column;line-height:1;margin-right:auto}
.rh-logo .lk{font-size:1.5rem;font-weight:700}
.rh-logo .lk .r{color:var(--red)}.rh-logo .lk .c{color:var(--muted)}.rh-logo .lk sup{font-size:.5em;color:var(--muted)}
.rh-logo .tag{font-size:.6rem;color:var(--muted);letter-spacing:.02em;margin-top:2px}
.rh-menu{display:flex;align-items:center;gap:20px;list-style:none;margin:0;padding:0}
.rh-menu a{color:#333;font-weight:400;font-size:.95rem}
.rh-menu a:hover{color:var(--red)}
@media(max-width:848px){.rh-menu{display:none}}

.crumbs{background:#fff;border-bottom:1px solid var(--line);font-size:.82rem;color:var(--muted);padding:8px 0}
.crumbs a{color:var(--muted)}.crumbs a:hover{color:var(--red)}

/* ---- HERO: canvas + cross-fading render slideshow + headline card ---- */
.rh-hero{background:var(--canvas);padding:34px 0 44px}
.rh-hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:34px;align-items:center}
.hero-stage{position:relative;min-height:360px}
.hero-slide{position:absolute;inset:0;background-size:contain;background-repeat:no-repeat;background-position:center;
  opacity:0;animation:herofade 32s infinite}
.hero-slide:nth-child(1){animation-delay:0s}.hero-slide:nth-child(2){animation-delay:8s}
.hero-slide:nth-child(3){animation-delay:16s}.hero-slide:nth-child(4){animation-delay:24s}
@keyframes herofade{0%{opacity:0}4%{opacity:1}22%{opacity:1}28%{opacity:0}100%{opacity:0}}
.hero-card{background:#f0f0f0;text-align:center;padding:6px 10px}
.hero-card .appicon{width:120px;height:120px;margin:0 auto 6px}
.hero-card h1{font-size:3.4rem;color:var(--red);margin:.1em 0 0}
.hero-card .sub{font-style:italic;font-size:1.4rem;color:#333;margin:.1em 0 .5em}
.hero-card p{color:var(--muted2);margin:0 auto 1em;max-width:34ch}
.hero-links{margin-bottom:1em;font-size:.95rem}.hero-links a{margin:0 6px}
@media(max-width:820px){.rh-hero .wrap{grid-template-columns:1fr}.hero-stage{min-height:240px;order:2}.hero-card h1{font-size:2.6rem}}

/* ---- signature RED RAISED download button ---- */
.dl-btn{display:inline-flex;align-items:center;gap:10px;min-width:280px;justify-content:center;
  color:#fff !important;font-weight:700;font-size:1.12rem;padding:15px 30px;border:0;border-radius:8px;cursor:pointer;
  background:linear-gradient(180deg,#d02718,#a3160a);
  box-shadow:0 4px var(--red-deep),0 6px 14px rgba(0,0,0,.3);transition:.12s}
.dl-btn:hover{background:linear-gradient(180deg,#810e05,#d02718);color:#fff;transform:translateY(1px);box-shadow:0 3px var(--red-deep),0 4px 10px rgba(0,0,0,.3)}
.dl-btn svg{width:20px;height:20px}
.btn2{display:inline-flex;align-items:center;gap:8px;background:#fff;color:var(--red) !important;border:1.5px solid var(--line);
  font-weight:600;padding:12px 24px;border-radius:8px}
.btn2:hover{border-color:var(--red);color:var(--red)}

/* ---- floating white rounded cards on canvas ---- */
.surface{background:var(--card);border-radius:6px;box-shadow:0 1px 3px rgba(0,0,0,.12),0 6px 20px rgba(0,0,0,.06)}
.section{padding:44px 0}
.section h2{font-size:1.9rem;margin:0 0 .3em}
.section .lead{color:var(--muted2);max-width:70ch}
.lead-def{font-size:1.1rem}

/* ---- 4-feature grid ---- */
.feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:26px}
.feat{background:var(--card);border-radius:6px;box-shadow:0 1px 3px rgba(0,0,0,.12);padding:20px}
.feat .ic{width:40px;height:40px;color:var(--red);margin-bottom:10px}
.feat .ic svg{width:40px;height:40px;stroke:var(--red)}
.feat h3{font-size:1.05rem;margin:0 0 .3em}
.feat p{margin:0;color:var(--muted2);font-size:.92rem}
@media(max-width:820px){.feat-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.feat-grid{grid-template-columns:1fr}}

/* ---- pricing block: New/Upgrade toggle + 3 cards + free ribbon ---- */
.price-toggle{display:flex;justify-content:center;gap:0;margin:8px auto 26px;width:max-content;
  background:#e2e2e2;border-radius:999px;padding:4px}
.price-toggle input{display:none}
.price-toggle label{padding:9px 26px;border-radius:999px;font-weight:600;color:#555;cursor:pointer;font-size:.95rem}
#pt-new:checked~.price-toggle label[for=pt-new],#pt-up:checked~.price-toggle label[for=pt-up]{background:#fff;color:var(--red);box-shadow:0 1px 3px rgba(0,0,0,.2)}
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.price-card{position:relative;background:var(--card);border-radius:8px;box-shadow:0 1px 3px rgba(0,0,0,.14),0 8px 24px rgba(0,0,0,.06);padding:28px 24px;text-align:center;overflow:hidden}
.price-card h3{font-size:1.2rem;margin:0 0 .2em}
.price-card .amt{font-size:2.4rem;font-weight:700;color:var(--red);margin:.1em 0}
.price-card .per{color:var(--muted);font-size:.85rem;margin-bottom:1em}
.price-card ul{list-style:none;padding:0;margin:0 0 1.2em;text-align:left;font-size:.92rem}
.price-card li{padding:5px 0 5px 22px;position:relative;color:#333}
.price-card li::before{content:"";position:absolute;left:2px;top:11px;width:11px;height:6px;border:2px solid var(--red);border-top:0;border-right:0;transform:rotate(-45deg)}
.ribbon{position:absolute;top:14px;right:-34px;transform:rotate(45deg);background:var(--red);color:#fff;font-weight:700;font-size:.8rem;padding:4px 40px}
.upgrade-price{display:none}#pt-up:checked~.price-grid .new-price{display:none}#pt-up:checked~.price-grid .upgrade-price{display:block}
@media(max-width:820px){.price-grid{grid-template-columns:1fr}}

/* ---- who-uses industry chips ---- */
.chips{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px}
.chip{background:var(--card);border:1px solid var(--line);border-radius:999px;padding:10px 18px;font-weight:500;font-size:.92rem}

/* ---- gallery ---- */
.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:24px}
.gallery figure{margin:0;background:var(--card);border-radius:6px;box-shadow:0 1px 3px rgba(0,0,0,.12);padding:10px}
.gallery figcaption{font-size:.8rem;color:var(--muted);padding-top:6px;text-align:center}
@media(max-width:820px){.gallery{grid-template-columns:1fr 1fr}}

/* ---- dark Grasshopper band ---- */
.gh-band{background:#1c1c1e;color:#eee;padding:48px 0}
.gh-band .wrap{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center}
.gh-band h2{color:#fff}
.gh-band p{color:#c7c7c7}
.gh-band img{border-radius:6px}
@media(max-width:820px){.gh-band .wrap{grid-template-columns:1fr}}

/* ---- steps / faq / compare ---- */
.steps{counter-reset:s;list-style:none;padding:0;margin:20px 0}
.steps li{position:relative;padding:7px 0 7px 46px;margin:.3em 0}
.steps li::before{counter-increment:s;content:counter(s);position:absolute;left:0;top:5px;width:32px;height:32px;background:var(--red);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700}
.faq dt{font-weight:600;font-size:1.04rem;margin-top:1.1em}
.faq dd{margin:.25em 0 0;color:#333}
.cmp{width:100%;border-collapse:collapse;border:1px solid var(--line);margin-top:16px;background:#fff}
.cmp th{background:var(--red);color:#fff;padding:11px;text-align:left;font-size:.95rem}
.cmp td{padding:11px;border-top:1px solid var(--line)}
.cmp tr:nth-child(even) td{background:#faf6f6}

/* ---- footer ---- */
.rh-foot{background:#fff;border-top:1px solid var(--line);padding:40px 0 22px;margin-top:8px;font-size:.9rem;color:var(--muted2)}
.rh-foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px}
.rh-foot h4{color:#222;font-size:.9rem;margin:0 0 .5em}
.rh-foot ul{list-style:none;margin:0;padding:0}.rh-foot li{margin:.32em 0}
.rh-foot a{color:var(--muted2)}.rh-foot a:hover{color:var(--red)}
.rh-foot .disc{border-top:1px solid var(--line);margin-top:24px;padding-top:14px;font-size:.8rem;color:var(--muted)}
@media(max-width:760px){.rh-foot-grid{grid-template-columns:1fr 1fr}}