/* =========================================================================
   ROTATEMP — stylesheet
   Palette + type derived from the ROTATEMP brand (navy / green / heat-orange,
   cold-climate atmosphere). Signature: rotary-to-heat transformation.
   ========================================================================= */

:root{
  --navy-900:#0b2038;
  --navy-800:#12385f;
  --navy-700:#1b4a76;
  --green-600:#2f8f3e;
  --green-700:#256f31;
  --heat-500:#ea6a1e;
  --heat-600:#cf5713;
  --amber-400:#f4a92c;
  --ice-50:#f5f9fc;
  --ice-100:#e9f1f8;
  --ice-200:#d8e6f1;
  --ink:#17293b;
  --muted:#5b6b7a;
  --line:#dbe6ef;
  --white:#ffffff;
  --maple:#d52b1e;

  --shadow-sm:0 1px 2px rgba(11,32,56,.06), 0 4px 14px rgba(11,32,56,.06);
  --shadow-md:0 10px 30px rgba(11,32,56,.10);
  --shadow-lg:0 24px 60px rgba(11,32,56,.16);
  --radius:18px;
  --radius-sm:12px;

  --font-display:'Sora',system-ui,sans-serif;
  --font-body:'Inter',system-ui,sans-serif;
  --font-mono:'IBM Plex Mono',ui-monospace,monospace;

  --wrap:1140px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font-body);color:var(--ink);
  background:var(--ice-50);line-height:1.6;-webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;display:block}
a{color:var(--green-700);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--navy-800);line-height:1.12;margin:0 0 .4em;font-weight:800;letter-spacing:-.02em}
h2{font-size:clamp(1.7rem,3.6vw,2.6rem)}
h3{font-size:1.3rem;font-weight:700}
p{margin:0 0 1rem}

.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:24px}
.skip-link{position:absolute;left:-999px;top:0;background:var(--navy-800);color:#fff;padding:10px 16px;border-radius:0 0 8px 0;z-index:200}
.skip-link:focus{left:0}
:focus-visible{outline:3px solid var(--amber-400);outline-offset:2px;border-radius:4px}

.eyebrow{
  font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.18em;
  font-size:.72rem;font-weight:600;color:var(--green-700);margin:0 0 .9rem;
  display:inline-flex;align-items:center;gap:.5rem;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--green-600);display:inline-block}
.eyebrow.on-dark{color:var(--amber-400)}
.eyebrow.on-dark::before{background:var(--amber-400)}

.ic{width:24px;height:24px}

/* ---- Buttons ----------------------------------------------------------- */
.btn{
  display:inline-flex;align-items:center;gap:.55rem;font-family:var(--font-display);
  font-weight:700;font-size:.98rem;padding:.85rem 1.5rem;border-radius:999px;
  border:1px solid transparent;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease,background .15s ease;
  text-decoration:none;
}
.btn:hover{text-decoration:none;transform:translateY(-2px)}
.btn-primary{background:var(--green-600);color:#fff;box-shadow:0 8px 22px rgba(47,143,62,.28)}
.btn-primary:hover{background:var(--green-700)}
.btn-heat{background:var(--heat-500);color:#fff;box-shadow:0 8px 22px rgba(234,106,30,.30)}
.btn-heat:hover{background:var(--heat-600)}
.btn-ghost{background:transparent;color:var(--navy-800);border-color:var(--line)}
.btn-ghost.on-dark{color:#eaf2fb;border-color:rgba(255,255,255,.35)}
.btn-ghost:hover{border-color:var(--navy-800);background:#fff}
.btn .ic{width:19px;height:19px}

/* ---- Header ------------------------------------------------------------ */
.site-head{position:sticky;top:0;z-index:100;background:rgba(245,249,252,.86);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.head-inner{display:flex;align-items:center;justify-content:space-between;min-height:70px;gap:1rem}
.brand{display:inline-flex;align-items:center;gap:.6rem;text-decoration:none}
.brand:hover{text-decoration:none}
.brand-mark{width:34px;height:34px;color:var(--green-600);display:grid;place-items:center;background:var(--white);border-radius:10px;box-shadow:var(--shadow-sm);animation:brandspin 14s linear infinite}
.brand-mark svg{width:20px;height:20px}
@keyframes brandspin{to{transform:rotate(360deg)}}
.brand-word{font-family:var(--font-display);font-size:1.32rem;letter-spacing:-.01em}
.brand-word b{color:var(--navy-800);font-weight:800}
.brand-word i{color:var(--green-600);font-weight:800;font-style:normal}

.site-nav{display:flex;align-items:center;gap:1.4rem}
.site-nav a{color:var(--navy-800);font-weight:600;font-size:.95rem}
.site-nav a:hover{color:var(--green-700);text-decoration:none}
.site-nav a[aria-current="page"]{color:var(--green-700)}
.nav-cta{background:var(--navy-800);color:#fff!important;padding:.5rem 1.05rem;border-radius:999px}
.nav-cta:hover{background:var(--navy-900);text-decoration:none}
.nav-toggle,.nav-burger{display:none}

/* ---- Section scaffolding ---------------------------------------------- */
.section{padding:clamp(3.5rem,7vw,6rem) 0}
.section-tight{padding:clamp(2.5rem,5vw,4rem) 0}
.lede{font-size:1.15rem;color:var(--muted);max-width:60ch}
.center{text-align:center}
.center .eyebrow{justify-content:center}
.center .lede{margin-inline:auto}

/* ---- Hero -------------------------------------------------------------- */
.hero{
  position:relative;overflow:hidden;color:#eaf2fb;
  background:
    radial-gradient(120% 90% at 82% 12%, rgba(234,106,30,.20), transparent 55%),
    radial-gradient(90% 80% at 8% 90%, rgba(47,143,62,.22), transparent 60%),
    linear-gradient(160deg,var(--navy-900),var(--navy-800) 60%,#0d2c4c);
}
.hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(closest-side,rgba(255,255,255,.05),transparent);
}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:3rem;align-items:center;padding:clamp(3.5rem,7vw,6rem) 0}
.hero h1{color:#fff;font-size:clamp(2.4rem,5.4vw,4rem);letter-spacing:-.03em;margin-bottom:1rem}
.hero h1 .warm{color:var(--amber-400)}
.hero p{color:#c6d6e8;font-size:1.18rem;max-width:52ch}
.hero-cta{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:1.8rem}
.hero-stats{display:flex;gap:2rem;margin-top:2.4rem;flex-wrap:wrap}
.hero-stat .n{font-family:var(--font-mono);font-size:1.7rem;font-weight:600;color:#fff}
.hero-stat .l{font-size:.82rem;color:#9fb6ce;letter-spacing:.02em}

/* Signature: rotary -> heat visual */
.flow{
  position:relative;background:rgba(255,255,255,.045);border:1px solid rgba(255,255,255,.12);
  border-radius:24px;padding:2rem 1.5rem;box-shadow:var(--shadow-lg);backdrop-filter:blur(4px);
}
.flow-track{display:flex;align-items:center;justify-content:space-between;gap:.4rem}
.flow-node{display:flex;flex-direction:column;align-items:center;gap:.6rem;text-align:center;flex:1}
.flow-disc{width:66px;height:66px;border-radius:50%;display:grid;place-items:center;color:#fff;box-shadow:0 10px 24px rgba(0,0,0,.28)}
.flow-disc svg{width:30px;height:30px}
.flow-disc.n-wind{background:var(--navy-700)}
.flow-disc.n-core{background:var(--green-600)}
.flow-disc.n-heat{background:var(--heat-500)}
.flow-disc.n-core svg{animation:spin 3.2s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.flow-disc.n-heat svg{animation:flicker 1.6s ease-in-out infinite}
@keyframes flicker{0%,100%{transform:translateY(0);opacity:.9}50%{transform:translateY(-2px);opacity:1}}
.flow-node span{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;color:#b9cbe0}
.flow-arrow{color:var(--amber-400);flex:0 0 auto}
.flow-arrow svg{width:26px;height:26px;animation:nudge 1.8s ease-in-out infinite}
@keyframes nudge{0%,100%{transform:translateX(0);opacity:.55}50%{transform:translateX(4px);opacity:1}}
.flow-caption{margin-top:1.5rem;text-align:center;font-size:.9rem;color:#cddbec}
.flow-caption b{color:var(--amber-400);font-family:var(--font-display)}
.flow-waves{display:flex;justify-content:center;gap:6px;margin-top:1.1rem;height:20px}
.flow-waves i{width:5px;border-radius:4px;background:linear-gradient(var(--amber-400),var(--heat-500));animation:rise 1.4s ease-in-out infinite}
.flow-waves i:nth-child(2){animation-delay:.15s}
.flow-waves i:nth-child(3){animation-delay:.3s}
.flow-waves i:nth-child(4){animation-delay:.45s}
.flow-waves i:nth-child(5){animation-delay:.6s}
@keyframes rise{0%,100%{height:6px;opacity:.5}50%{height:20px;opacity:1}}

/* ---- Cards / capability grid ------------------------------------------ */
.grid{display:grid;gap:1.4rem}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}

.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.7rem;box-shadow:var(--shadow-sm);transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:var(--ice-200)}
.card-ic{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;margin-bottom:1rem;background:var(--ice-100);color:var(--green-700)}
.card-ic .ic{width:26px;height:26px}
.card.heat .card-ic{background:#fdefe4;color:var(--heat-600)}
.card.navy .card-ic{background:#e7eef6;color:var(--navy-700)}
.card h3{margin-bottom:.35rem}
.card p{color:var(--muted);margin:0;font-size:.96rem}

/* ---- Split feature ----------------------------------------------------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center}
.split.rev .split-media{order:2}
.split-media{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-md);background:var(--navy-800);min-height:320px;position:relative}
.feature-list{list-style:none;padding:0;margin:1.4rem 0 0;display:grid;gap:.8rem}
.feature-list li{display:flex;gap:.7rem;align-items:flex-start;color:var(--ink)}
.feature-list .ic{width:22px;height:22px;color:var(--green-600);flex:0 0 auto;margin-top:2px}

/* Panel used as illustrative media */
.panel-illus{position:absolute;inset:0;display:grid;place-items:center;
  background:
    radial-gradient(80% 70% at 70% 20%, rgba(234,106,30,.28), transparent 60%),
    radial-gradient(70% 70% at 20% 85%, rgba(47,143,62,.30), transparent 60%),
    linear-gradient(150deg,var(--navy-900),var(--navy-800));
  color:#eaf2fb;padding:2rem;text-align:center}
.panel-illus .big{font-family:var(--font-mono);font-size:2.6rem;color:#fff;font-weight:600}
.panel-illus .cap{color:#a9c0d8;font-size:.9rem;letter-spacing:.03em;margin-top:.4rem}
.panel-illus .rotor-spin{width:74px;height:74px;color:var(--amber-400);margin:0 auto 1rem;animation:spin 4s linear infinite}

/* ---- Cost table -------------------------------------------------------- */
.cost{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-md)}
.cost table{width:100%;border-collapse:collapse}
.cost thead th{background:var(--green-600);color:#fff;text-align:left;font-family:var(--font-display);font-weight:700;padding:1rem 1.4rem;font-size:.95rem}
.cost thead th:last-child{text-align:right}
.cost td{padding:1rem 1.4rem;border-top:1px solid var(--line);font-size:1rem}
.cost td:last-child{text-align:right;font-family:var(--font-mono);font-weight:600;color:var(--navy-800)}
.cost tr.hi td{background:#eef8f0;font-weight:700}
.cost tr.hi td:first-child{color:var(--green-700)}
.cost tr.hi td:last-child{color:var(--green-700)}
.cost-note{font-size:.82rem;color:var(--muted);margin-top:1rem;max-width:70ch}
.cost-bar{height:8px;border-radius:4px;background:var(--ice-100);overflow:hidden;margin-top:.4rem}
.cost-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--green-600),var(--amber-400))}

/* ---- Band (dark CTA / stat strips) ------------------------------------ */
.band{background:linear-gradient(150deg,var(--navy-900),var(--navy-800));color:#eaf2fb}
.band h2{color:#fff}
.band p{color:#c6d6e8}
.band .eyebrow{color:var(--amber-400)}
.band .eyebrow::before{background:var(--amber-400)}

/* ---- Application tiles -------------------------------------------------- */
.app-tile{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem;box-shadow:var(--shadow-sm);transition:transform .18s ease,box-shadow .18s ease}
.app-tile:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.app-tile .card-ic{background:#e7eef6;color:var(--navy-700)}
.app-tile h3{font-size:1.15rem}
.app-tile p{color:var(--muted);font-size:.94rem;margin:0}

/* ---- Product blocks ---------------------------------------------------- */
.prod{display:grid;grid-template-columns:.9fr 1.1fr;gap:2.4rem;align-items:center;padding:2.4rem 0;border-top:1px solid var(--line)}
.prod:first-of-type{border-top:0}
.prod.rev .prod-visual{order:2}
.prod-visual{border-radius:var(--radius);min-height:260px;position:relative;overflow:hidden;box-shadow:var(--shadow-md)}
.prod-tag{font-family:var(--font-mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.14em;color:var(--heat-600);font-weight:600}

/* ---- Founders ---------------------------------------------------------- */
.founder{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.8rem;box-shadow:var(--shadow-sm);text-align:center}
.founder .avatar{width:84px;height:84px;border-radius:50%;margin:0 auto 1rem;display:grid;place-items:center;font-family:var(--font-display);font-weight:800;font-size:1.7rem;color:#fff;background:linear-gradient(140deg,var(--navy-700),var(--green-600))}
.founder h3{margin-bottom:.2rem}
.founder .role{font-family:var(--font-mono);font-size:.75rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted)}

/* ---- Forms ------------------------------------------------------------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:start}
.field{margin-bottom:1.1rem}
.field label{display:block;font-weight:600;font-size:.9rem;margin-bottom:.4rem;color:var(--navy-800)}
.field input,.field textarea,.field select{
  width:100%;padding:.8rem 1rem;border:1px solid var(--line);border-radius:12px;
  font:inherit;color:var(--ink);background:#fff;transition:border-color .15s ease,box-shadow .15s ease;
}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--green-600);box-shadow:0 0 0 3px rgba(47,143,62,.15)}
.field textarea{min-height:140px;resize:vertical}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form-note{font-size:.82rem;color:var(--muted)}
.alert{padding:1rem 1.2rem;border-radius:12px;margin-bottom:1.4rem;font-size:.95rem}
.alert-ok{background:#eaf7ee;border:1px solid #bfe3c8;color:var(--green-700)}
.alert-err{background:#fdecea;border:1px solid #f3c6bf;color:#b23120}
.contact-side{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.8rem;box-shadow:var(--shadow-sm)}
.contact-side h3{margin-bottom:.8rem}
.contact-line{display:flex;gap:.7rem;align-items:center;margin-bottom:.9rem;color:var(--ink)}
.contact-line .ic{color:var(--green-600);width:20px;height:20px}

/* ---- FAQ --------------------------------------------------------------- */
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:.4rem 1.3rem;margin-bottom:.8rem;box-shadow:var(--shadow-sm)}
.faq summary{cursor:pointer;font-family:var(--font-display);font-weight:700;color:var(--navy-800);padding:.9rem 0;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.4rem;color:var(--green-600);font-weight:400}
.faq details[open] summary::after{content:"–"}
.faq details p{color:var(--muted);margin:0 0 1rem}

/* ---- Chips / meta ------------------------------------------------------ */
.chips{display:flex;flex-wrap:wrap;gap:.55rem;margin-top:1.2rem}
.chip{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.04em;padding:.4rem .8rem;border-radius:999px;background:var(--ice-100);color:var(--navy-700);border:1px solid var(--ice-200)}

.disclaimer{background:#fff;border:1px dashed var(--line);border-left:4px solid var(--amber-400);border-radius:12px;padding:1.2rem 1.4rem;color:var(--muted);font-size:.9rem}

/* ---- Page hero (interior) --------------------------------------------- */
.page-hero{background:linear-gradient(160deg,var(--navy-900),var(--navy-800));color:#eaf2fb;padding:clamp(3rem,6vw,4.5rem) 0}
.page-hero h1{color:#fff;font-size:clamp(2rem,4.4vw,3rem);margin-bottom:.6rem}
.page-hero p{color:#c6d6e8;max-width:60ch;font-size:1.12rem;margin:0}
.page-hero .eyebrow{color:var(--amber-400)}
.page-hero .eyebrow::before{background:var(--amber-400)}

/* ---- Utilities --------------------------------------------------------- */
.mt-0{margin-top:0}.mb-0{margin-bottom:0}
.stack>*+*{margin-top:1rem}
.muted{color:var(--muted)}
.maple{color:var(--maple)}

/* ---- Reveal on scroll -------------------------------------------------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ---- Responsive -------------------------------------------------------- */
@media (max-width:920px){
  .hero-grid{grid-template-columns:1fr;gap:2.4rem}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .split,.prod,.contact-grid{grid-template-columns:1fr;gap:2rem}
  .split.rev .split-media,.prod.rev .prod-visual{order:0}
  .nav-burger{display:flex;flex-direction:column;gap:5px;cursor:pointer;padding:8px;z-index:110}
  .nav-burger span{width:24px;height:2px;background:var(--navy-800);border-radius:2px;transition:.25s}
  .site-nav{
    position:fixed;inset:70px 0 auto 0;background:var(--ice-50);flex-direction:column;
    align-items:stretch;gap:0;padding:.5rem 24px 1.4rem;border-bottom:1px solid var(--line);
    transform:translateY(-130%);transition:transform .28s ease;box-shadow:var(--shadow-md);
  }
  .site-nav a{padding:.9rem 0;border-bottom:1px solid var(--line)}
  .nav-cta{margin-top:.8rem;text-align:center}
  .nav-toggle:checked ~ .site-nav{transform:translateY(0)}
  .nav-toggle:checked ~ .nav-burger span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle:checked ~ .nav-burger span:nth-child(2){opacity:0}
  .nav-toggle:checked ~ .nav-burger span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
}
@media (max-width:560px){
  .grid-4,.grid-3,.grid-2{grid-template-columns:1fr}
  .hero-stats{gap:1.4rem}
  .flow-node span{font-size:.58rem}
  .flow-disc{width:56px;height:56px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}