/* ============================================================
   eCircuitCalc — Base design system (tokens, nav, footer, ui)
   ============================================================ */
:root{
  --font:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,'SF Mono',Menlo,monospace;
  --radius:16px; --radius-sm:10px;
  --nav-h:68px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#070b14; --bg2:#0b1120;
  --surface:rgba(255,255,255,.045); --surface2:rgba(255,255,255,.08);
  --border:rgba(148,163,184,.16); --border2:rgba(148,163,184,.3);
  --text:#e7eef8; --text2:#9aa8bd;
  --accent:#22d3ee; --accent2:#3b82f6; --accent3:#8b5cf6;
  --grad:linear-gradient(135deg,#22d3ee 0%,#3b82f6 55%,#8b5cf6 100%);
  --glow:rgba(34,211,238,.35);
  --shadow:0 18px 50px -18px rgba(0,0,0,.65);
  --cw:#e2e8f0; --wbase:rgba(148,163,184,.55);
  --orb1:rgba(34,211,238,.16); --orb2:rgba(139,92,246,.15); --orb3:rgba(59,130,246,.13);
  --grid-line:rgba(148,163,184,.07); --sweep:rgba(34,211,238,.10); --sweep2:rgba(139,92,246,.10);

}
:root[data-theme="light"]{
  color-scheme:light;
  --bg:#f5f8fc; --bg2:#edf2fa;
  --surface:#ffffff; --surface2:#f1f5fb;
  --border:rgba(15,23,42,.12); --border2:rgba(15,23,42,.25);
  --text:#0f172a; --text2:#4b5a70;
  --accent:#0284c7; --accent2:#2563eb; --accent3:#7c3aed;
  --grad:linear-gradient(135deg,#0ea5e9 0%,#2563eb 55%,#7c3aed 100%);
  --glow:rgba(2,132,199,.25);
  --shadow:0 18px 45px -20px rgba(15,23,42,.25);
  --cw:#1e293b; --wbase:rgba(71,85,105,.5);
  --orb1:rgba(2,132,199,.14); --orb2:rgba(124,58,237,.10); --orb3:rgba(37,99,235,.10);
  --grid-line:rgba(15,23,42,.05); --sweep:rgba(2,132,199,.07); --sweep2:rgba(124,58,237,.06);

}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;
  -webkit-font-smoothing:antialiased;transition:background .45s var(--ease),color .45s var(--ease)}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul{list-style:none}
.mono{font-family:var(--mono)}
.container{width:min(1180px,92%);margin-inline:auto}
.narrow{width:min(820px,92%)}
section{scroll-margin-top:calc(var(--nav-h) + 16px)}
::selection{background:var(--accent);color:#04121a}

.skip{position:absolute;left:-999px;top:8px;z-index:200;background:var(--accent);color:#04121a;
  padding:.6rem 1rem;border-radius:8px;font-weight:600}
.skip:focus{left:8px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}

/* ---------- Section scaffolding ---------- */
.section{padding:clamp(3.5rem,8vw,6rem) 0;position:relative}
.section.alt{background:var(--bg2)}
.section-head{max-width:640px;margin:0 auto clamp(2rem,5vw,3.2rem);text-align:center}
.section-head h2{font-size:clamp(1.7rem,3.6vw,2.5rem);font-weight:800;letter-spacing:-.02em;margin:.5rem 0 .6rem}
.section-head p{color:var(--text2)}
.eyebrow{font-family:var(--mono);font-size:.72rem;font-weight:600;letter-spacing:.22em;
  text-transform:uppercase;color:var(--accent)}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:.55rem;font-weight:600;font-size:.95rem;
  padding:.85rem 1.6rem;border-radius:12px;transition:transform .25s var(--ease),box-shadow .25s,background .25s,border-color .25s;white-space:nowrap}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 28px -10px var(--glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 36px -10px var(--glow)}
.btn-ghost{border:1px solid var(--border2);background:var(--surface)}
.btn-ghost:hover{transform:translateY(-2px);border-color:var(--accent);color:var(--accent)}

/* ---------- Badges / chips ---------- */
.badge{display:inline-flex;align-items:center;gap:.4rem;font-family:var(--mono);font-size:.68rem;
  font-weight:600;letter-spacing:.08em;text-transform:uppercase;padding:.32rem .7rem;border-radius:999px;
  border:1px solid var(--border2);color:var(--text2);background:var(--surface)}
.badge-soon{color:#fbbf24;border-color:rgba(251,191,36,.4);background:rgba(251,191,36,.08)}
.badge-live{color:#4ade80;border-color:rgba(74,222,128,.4);background:rgba(74,222,128,.08)}

/* ---------- Cards ---------- */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px)}

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav{position:sticky;top:0;z-index:100;height:var(--nav-h);
  background:color-mix(in srgb,var(--bg) 78%,transparent);
  backdrop-filter:blur(16px) saturate(1.4);-webkit-backdrop-filter:blur(16px) saturate(1.4);
  border-bottom:1px solid var(--border)}
.nav-inner{height:100%;display:flex;align-items:center;gap:1.2rem}
.brand{display:flex;align-items:center;gap:.6rem;font-weight:800;font-size:1.12rem;letter-spacing:-.02em}
.brand .logo{width:34px;height:34px;flex:none}
.brand em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav-links{display:flex;gap:.2rem;margin-left:auto}
.nav-links a{position:relative;padding:.55rem .8rem;border-radius:10px;font-size:.92rem;font-weight:500;color:var(--text2);transition:color .2s,background .2s}
.nav-links a:hover{color:var(--text);background:var(--surface2)}
.nav-links a.active{color:var(--accent)}
.nav-links a.active::after{content:"";position:absolute;left:.8rem;right:.8rem;bottom:.25rem;height:2px;border-radius:2px;background:var(--grad)}
.nav-actions{display:flex;align-items:center;gap:.5rem}
.icon-btn{width:40px;height:40px;display:grid;place-items:center;border-radius:10px;color:var(--text2);
  border:1px solid transparent;transition:.2s}
.icon-btn:hover{color:var(--accent);background:var(--surface2);border-color:var(--border)}

/* Theme toggle */
.theme-toggle{width:56px;height:30px;border-radius:999px;border:1px solid var(--border2);
  background:var(--surface2);position:relative;padding:0}
.tt-thumb{position:absolute;top:3px;left:3px;width:22px;height:22px;border-radius:50%;
  background:var(--grad);box-shadow:0 2px 8px var(--glow);transition:transform .4s var(--ease)}
:root[data-theme="dark"] .tt-thumb{transform:translateX(26px)}
.tt-ic{position:absolute;top:50%;transform:translateY(-50%);width:15px;height:15px;color:#fff;opacity:0;transition:opacity .3s}
.tt-ic.sun{left:7px}.tt-ic.moon{right:7px}
:root[data-theme="light"] .tt-ic.sun{opacity:1}
:root[data-theme="dark"] .tt-ic.moon{opacity:1}

.burger{display:none}
@media (max-width:920px){
  .nav-links{position:fixed;inset:var(--nav-h) 0 auto 0;flex-direction:column;gap:.15rem;
    background:var(--bg);border-bottom:1px solid var(--border);padding:1rem 4%;
    transform:translateY(-130%);transition:transform .4s var(--ease);z-index:-1}
  .nav.open .nav-links{transform:translateY(0)}
  .nav-links a{padding:.8rem 1rem;font-size:1rem}
  .burger{display:grid}
}
.burger span{display:block;width:18px;height:2px;background:currentColor;margin:2.5px 0;border-radius:2px;transition:.3s var(--ease)}
.nav.open .burger span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.nav.open .burger span:nth-child(2){opacity:0}
.nav.open .burger span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

/* ============================================================
   SEARCH OVERLAY
   ============================================================ */
.overlay{position:fixed;inset:0;z-index:150;display:flex;justify-content:center;align-items:flex-start;
  padding:12vh 5% 5%;background:rgba(4,8,16,.6);backdrop-filter:blur(8px);
  opacity:0;pointer-events:none;transition:opacity .3s}
.overlay.open{opacity:1;pointer-events:auto}
.search-panel{width:min(620px,100%);background:var(--surface);border:1px solid var(--border2);
  border-radius:18px;box-shadow:var(--shadow);backdrop-filter:blur(20px);overflow:hidden;
  transform:translateY(-14px) scale(.98);transition:transform .3s var(--ease)}
.overlay.open .search-panel{transform:none}
.search-box{display:flex;align-items:center;gap:.8rem;padding:1.1rem 1.2rem;border-bottom:1px solid var(--border)}
.search-box svg{color:var(--text2);flex:none}
.search-box input{flex:1;background:none;border:0;outline:0;color:var(--text);font-size:1.05rem}
.search-box kbd{font-family:var(--mono);font-size:.7rem;color:var(--text2);border:1px solid var(--border2);
  border-radius:6px;padding:.15rem .5rem}
.search-results{max-height:52vh;overflow:auto;padding:.5rem}
.search-results a{display:flex;justify-content:space-between;gap:1rem;align-items:center;
  padding:.75rem .9rem;border-radius:10px;font-size:.95rem}
.search-results a:hover{background:var(--surface2);color:var(--accent)}
.search-results small{color:var(--text2);font-family:var(--mono);font-size:.7rem}
.search-empty{padding:2rem;text-align:center;color:var(--text2)}

/* ============================================================
   FOOTER
   ============================================================ */
.footer{border-top:1px solid var(--border);background:var(--bg2);padding:3.5rem 0 2rem;margin-top:2rem}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:2.5rem}
.footer h4{font-size:.8rem;font-family:var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--text2);margin-bottom:1rem}
.footer-brand p{color:var(--text2);font-size:.92rem;margin:.9rem 0 1.2rem;max-width:300px}
.socials{display:flex;gap:.6rem}
.socials a{width:38px;height:38px;display:grid;place-items:center;border-radius:10px;border:1px solid var(--border);
  color:var(--text2);transition:.25s}
.socials a:hover{color:var(--accent);border-color:var(--accent);transform:translateY(-3px)}
.footer-col a{display:block;color:var(--text2);font-size:.92rem;padding:.32rem 0;transition:.2s}
.footer-col a:hover{color:var(--accent);transform:translateX(4px)}
.footer-bottom{display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between;align-items:center;
  margin-top:2.8rem;padding-top:1.6rem;border-top:1px solid var(--border);color:var(--text2);font-size:.85rem}
@media (max-width:820px){.footer-grid{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.footer-grid{grid-template-columns:1fr}}

/* ============================================================
   SHARED UI (forms, reveal, back-to-top, toast)
   ============================================================ */
.field{margin-bottom:1.1rem}
.field label{display:block;font-size:.88rem;font-weight:600;margin-bottom:.45rem}
.field input,.field select,.field textarea{width:100%;padding:.8rem 1rem;border-radius:12px;
  border:1px solid var(--border2);background:var(--surface);color:var(--text);font:inherit;transition:.2s}
.field input:focus,.field select:focus,.field textarea:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px var(--glow)}
.field .err{color:#f87171;font-size:.8rem;margin-top:.35rem;display:none}
.field.invalid input,.field.invalid textarea{border-color:#f87171}
.field.invalid .err{display:block}

.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}

.back-top{position:fixed;right:22px;bottom:22px;z-index:90;width:46px;height:46px;border-radius:12px;
  background:var(--grad);color:#fff;display:grid;place-items:center;box-shadow:var(--shadow);
  opacity:0;transform:translateY(14px);pointer-events:none;transition:.35s var(--ease)}
.back-top.show{opacity:1;transform:none;pointer-events:auto}
.back-top:hover{transform:translateY(-3px)}

.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);z-index:300;
  background:var(--surface);border:1px solid var(--border2);border-left:3px solid var(--accent);
  padding:.9rem 1.3rem;border-radius:12px;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.35s var(--ease)}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* Page hero strip (secondary pages) */
.page-hero{padding:clamp(3rem,7vw,5rem) 0 2.5rem;text-align:center;position:relative;overflow:hidden}
.page-hero h1{font-size:clamp(2rem,5vw,3rem);font-weight:800;letter-spacing:-.02em}
.page-hero p{color:var(--text2);max-width:620px;margin:.8rem auto 0}
.breadcrumb{font-family:var(--mono);font-size:.78rem;color:var(--text2);margin-bottom:1rem}
.breadcrumb a:hover{color:var(--accent)}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}

/* ============================================================
   Lively ambient background
   ============================================================ */
.bg-ambient{position:fixed;inset:0;z-index:-2;overflow:hidden;pointer-events:none}
.bg-ambient::before{content:"";position:absolute;inset:-25%;
  background:
    radial-gradient(38% 34% at 18% 24%,var(--orb1),transparent 70%),
    radial-gradient(34% 30% at 82% 16%,var(--orb2),transparent 70%),
    radial-gradient(42% 38% at 72% 84%,var(--orb3),transparent 70%);
  filter:blur(70px);
  animation:orbShift 28s ease-in-out infinite alternate}
.bg-ambient::after{content:"";position:absolute;inset:-46px;
  background:
    linear-gradient(var(--grid-line) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);
  background-size:46px 46px;
  -webkit-mask-image:radial-gradient(ellipse 95% 75% at 50% 25%,#000 25%,transparent 82%);
  mask-image:radial-gradient(ellipse 95% 75% at 50% 25%,#000 25%,transparent 82%);
  animation:gridPan 38s linear infinite}

.bg-dot{position:absolute;border-radius:50%;background:var(--accent);opacity:.3;
  animation:dotFloat 9s ease-in-out infinite}
.d1{left:12%;top:32%;width:6px;height:6px}
.d2{left:27%;top:72%;width:4px;height:4px;animation-delay:1.6s;animation-duration:11s}
.d3{left:54%;top:20%;width:5px;height:5px;animation-delay:3.1s}
.d4{left:73%;top:66%;width:4px;height:4px;animation-delay:4.4s;animation-duration:12s}
.d5{left:88%;top:36%;width:7px;height:7px;animation-delay:2.2s}
@keyframes orbShift{
  0%{transform:translate(0,0) scale(1)}
  50%{transform:translate(2.5%,-2%) scale(1.05)}
  100%{transform:translate(-2.5%,2%) scale(1.02)}}
@keyframes gridPan{to{transform:translate(46px,46px)}}

@keyframes dotFloat{
  0%,100%{transform:translateY(0);opacity:.12}
  50%{transform:translateY(-28px);opacity:.55}}

/* Let the ambient glow show through the banded section */
.section.alt{background:color-mix(in srgb,var(--bg2) 55%,transparent)}

/* ============================================================
   Cookie consent UI
   ============================================================ */
.cc-banner{position:fixed;left:0;right:0;bottom:0;z-index:140;
  background:color-mix(in srgb,var(--bg) 84%,transparent);
  backdrop-filter:blur(16px) saturate(1.3);-webkit-backdrop-filter:blur(16px) saturate(1.3);
  border-top:1px solid var(--border);box-shadow:0 -18px 50px -22px rgba(0,0,0,.55);
  animation:ccUp .5s var(--ease)}
@keyframes ccUp{from{transform:translateY(100%)}to{transform:translateY(0)}}
.cc-inner{max-width:1080px;margin:0 auto;display:grid;grid-template-columns:1.45fr 1fr;gap:1.6rem;
  align-items:center;padding:1.15rem 0 1.25rem}
.cc-text strong{font-size:.98rem}
.cc-text p{color:var(--text2);font-size:.88rem;margin-top:.35rem}
.cc-text a{color:var(--accent)}
.cc-actions{display:flex;gap:.7rem;flex-wrap:wrap;justify-content:flex-end;align-items:center}
.cc-link{font-size:.88rem;font-weight:600;color:var(--text2);text-decoration:underline;text-underline-offset:3px}
.cc-link:hover{color:var(--accent)}
@media (max-width:760px){
  .cc-inner{grid-template-columns:1fr;gap:.9rem}
  .cc-actions{justify-content:stretch}
  .cc-actions .btn{flex:1;justify-content:center}
  .cc-link{flex-basis:100%;text-align:center}
}

/* Settings modal */
.cc-overlay{position:fixed;inset:0;z-index:160;display:flex;align-items:center;justify-content:center;
  padding:5%;background:rgba(4,8,16,.6);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.cc-overlay[hidden]{display:none}
.cc-modal{width:min(560px,100%);max-height:90vh;overflow:auto;background:var(--bg);
  border:1px solid var(--border2);border-radius:18px;box-shadow:var(--shadow);padding:1.8rem}
.cc-modal h2{font-size:1.3rem;margin-bottom:.4rem}
.cc-desc{color:var(--text2);font-size:.92rem;margin-bottom:1.2rem}
.cc-row{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;
  padding:1.1rem 0;border-top:1px solid var(--border)}
.cc-row h3{font-size:1rem;margin-bottom:.25rem}
.cc-row p{color:var(--text2);font-size:.86rem}
.cc-always{font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--text2);flex:none;padding-top:.3rem}
.cc-actions{margin-top:1.4rem}
.cc-pp{margin-top:1.1rem;font-size:.85rem}
.cc-pp a{color:var(--accent)}
@media (max-width:560px){.cc-modal{padding:1.3rem}.cc-actions .btn{flex:1;justify-content:center}}

/* Accessible switch (same visual language as the theme toggle) */
.switch{position:relative;display:inline-block;flex:none}
.switch input{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:pointer}
.switch .track{display:block;width:46px;height:26px;border-radius:999px;position:relative;
  background:var(--surface2);border:1px solid var(--border2);transition:.3s var(--ease)}
.switch .track::after{content:"";position:absolute;top:3px;left:3px;width:18px;height:18px;border-radius:50%;
  background:var(--text2);transition:.3s var(--ease)}
.switch input:checked + .track{background:var(--accent);border-color:var(--accent)}
.switch input:checked + .track::after{transform:translateX(20px);background:#fff}
.switch input:focus-visible + .track{outline:2px solid var(--accent);outline-offset:3px}