/* ============ eCircuitCalc — Landing page ============ */

/* ---------- HERO ---------- */
.hero{position:relative;padding:clamp(3rem,7vw,5.5rem) 0 clamp(2.5rem,6vw,4.5rem);overflow:hidden}
.hero-bg{position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(700px 380px at 82% 18%, var(--glow), transparent 65%),
    radial-gradient(560px 340px at 8% 82%, rgba(139,92,246,.16), transparent 60%),
    linear-gradient(var(--border) 1px,transparent 1px),
    linear-gradient(90deg,var(--border) 1px,transparent 1px);
  background-size:auto,auto,44px 44px,44px 44px;
  mask-image:radial-gradient(ellipse at 50% 30%,#000 30%,transparent 78%);
  -webkit-mask-image:radial-gradient(ellipse at 50% 30%,#000 30%,transparent 78%)}
.hero-grid{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(2rem,5vw,4rem);align-items:center}
.pill-badge{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--mono);font-size:.74rem;
  letter-spacing:.1em;text-transform:uppercase;color:var(--accent);border:1px solid var(--border2);
  background:var(--surface);padding:.45rem .9rem;border-radius:999px;margin-bottom:1.4rem}
.pill-badge .dot{width:7px;height:7px;border-radius:50%;background:#4ade80;box-shadow:0 0 10px #4ade80;animation:blink 1.8s infinite}
@keyframes blink{50%{opacity:.35}}
.hero h1{font-size:clamp(2.3rem,5.4vw,3.7rem);font-weight:800;line-height:1.08;letter-spacing:-.03em}
.tagline{margin-top:1rem;font-size:clamp(1.05rem,2vw,1.3rem);font-weight:600;color:var(--text)}
.lead{margin-top:.9rem;color:var(--text2);max-width:540px}
.hero-actions{display:flex;flex-wrap:wrap;gap:.9rem;margin-top:2rem}
.hero-actions.center{justify-content:center}
.hero-meta{display:flex;gap:2.4rem;margin-top:2.4rem;flex-wrap:wrap}
.hero-meta li{display:flex;flex-direction:column}
.hero-meta strong{font-size:1.7rem;font-weight:800;font-family:var(--mono);
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-meta span{font-size:.82rem;color:var(--text2)}

/* ---------- CIRCUIT PANEL ---------- */
.circuit-panel{background:var(--surface);border:1px solid var(--border);border-radius:22px;
  backdrop-filter:blur(18px);box-shadow:var(--shadow);overflow:hidden;
  animation:float 7s ease-in-out infinite}
@keyframes float{50%{transform:translateY(-10px)}}
.circuit-head{display:flex;justify-content:space-between;align-items:center;
  padding:.85rem 1.2rem;border-bottom:1px solid var(--border);background:var(--surface2)}
.circuit-title{font-size:.78rem;color:var(--text2)}
.live{display:flex;align-items:center;gap:.45rem;font-family:var(--mono);font-size:.68rem;
  letter-spacing:.12em;color:#4ade80}
.live i{width:8px;height:8px;border-radius:50%;background:#4ade80;box-shadow:0 0 10px #4ade80;animation:blink 1.4s infinite}
.circuit-stage{padding:1rem 1.2rem 0;
  background:
    linear-gradient(var(--border) 1px,transparent 1px) 0 0/22px 22px,
    linear-gradient(90deg,var(--border) 1px,transparent 1px) 0 0/22px 22px,
    var(--bg2)}
.circuit{width:100%;height:auto}
.circuit .wire path{fill:none;stroke:var(--wbase);stroke-width:2.4;stroke-linecap:round}
.circuit .comp{fill:none;stroke:var(--cw);stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round}
.circuit .comp.thick{stroke-width:5}
.circuit .lbl{fill:var(--text);font-family:var(--mono);font-size:17px;font-weight:600}
.circuit .lbl.small{font-size:14px}
.circuit .i-lbl{font-size:15px;fill:var(--text2)}
.circuit .node{fill:var(--cw)}
.circuit .flow{fill:none;stroke:var(--accent);stroke-width:3;stroke-linecap:round;
  stroke-dasharray:14 20;filter:drop-shadow(0 0 6px var(--glow));animation:flowDash 1.1s linear infinite}
@keyframes flowDash{to{stroke-dashoffset:-34}}
.circuit .led-glow{animation:ledPulse 1.8s ease-in-out infinite}
@keyframes ledPulse{50%{opacity:.45}}
.circuit .led-body{fill:#22c55e;stroke:#4ade80;stroke-width:2;stroke-linejoin:round;
  filter:drop-shadow(0 0 8px rgba(34,197,94,.9));animation:ledBody 1.8s ease-in-out infinite}
@keyframes ledBody{50%{opacity:.75}}
.circuit .led-arrows line{stroke:var(--cw);stroke-width:2;stroke-linecap:round;opacity:.85}
.circuit .i-arrow{stroke:var(--accent);stroke-width:5;stroke-linecap:round;
  filter:drop-shadow(0 0 5px var(--glow));animation:iPulse 1.6s ease-in-out infinite}
@keyframes iPulse{50%{opacity:.5}}
.circuit-foot{display:flex;gap:.6rem;padding:1rem 1.2rem 1.2rem;flex-wrap:wrap}
.chip{font-family:var(--mono);font-size:.76rem;padding:.4rem .8rem;border-radius:8px;
  border:1px solid var(--border2);background:var(--surface2);color:var(--text2)}
.led-chip{color:#4ade80;border-color:rgba(74,222,128,.45)}

/* ---------- AD SLOTS (auto-hide) ---------- */
.ad-slot{margin:0 auto 1rem;max-width:728px;text-align:center;
  transition:max-height .5s var(--ease),opacity .4s,margin .5s;max-height:160px;overflow:hidden}
.ad-slot.ad-hidden{max-height:0;opacity:0;margin:0}
.ad-label{display:block;font-family:var(--mono);font-size:.62rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--text2);opacity:.6;margin-bottom:.4rem}
.ad-box{min-height:90px;border:1.5px dashed var(--border2);border-radius:12px;
  display:grid;place-items:center;color:var(--text2);font-size:.85rem;background:var(--surface)}
.ad-slot.ad-hidden + .ad-slot{max-height:0}

/* ---------- CATEGORY TABS ---------- */
.cat-tabs-wrap{display:flex;gap:.5rem;overflow-x:auto;padding:.4rem .2rem 1rem;
  scrollbar-width:thin;scrollbar-color:var(--border2) transparent}
.cat-tab{flex:none;display:inline-flex;align-items:center;gap:.5rem;padding:.6rem 1.05rem;
  border-radius:999px;border:1px solid var(--border);background:var(--surface);
  font-size:.88rem;font-weight:500;color:var(--text2);transition:.25s var(--ease);white-space:nowrap}
.cat-tab svg{width:16px;height:16px}
.cat-tab:hover{color:var(--text);border-color:var(--border2);transform:translateY(-2px)}
.cat-tab.active{background:var(--grad);color:#fff;border-color:transparent;box-shadow:0 8px 22px -8px var(--glow)}
.cat-count{font-family:var(--mono);font-size:.68rem;opacity:.75}

/* ---------- CATEGORY PREVIEW CARDS ---------- */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:1.4rem;margin-top:1.4rem}
.cat-card{display:flex;flex-direction:column;padding:1.5rem;border-radius:var(--radius);
  background:var(--surface);border:1px solid var(--border);backdrop-filter:blur(12px);
  transition:transform .35s var(--ease),box-shadow .35s,border-color .35s;position:relative;overflow:hidden}
.cat-card::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;background:var(--grad);
  opacity:0;transition:opacity .3s}
.cat-card:hover{transform:translateY(-7px);border-color:var(--border2);box-shadow:var(--shadow)}
.cat-card:hover::before{opacity:1}
.cat-card.hide{display:none}
.cat-card-top{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:1rem}
.cat-icon{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;
  background:hsl(var(--h) 80% 55% / .14);color:hsl(var(--h) 85% 62%);border:1px solid hsl(var(--h) 80% 55% / .3);
  transition:transform .4s var(--ease)}
.cat-icon svg{width:26px;height:26px}
.cat-card:hover .cat-icon{transform:scale(1.1) rotate(-4deg)}
.cat-card h3{font-size:1.12rem;font-weight:700;letter-spacing:-.01em}
.cat-circuit{margin:.9rem 0;padding:.7rem .9rem;border-radius:12px;background:var(--bg2);
  border:1px solid var(--border);overflow:hidden}
.cat-circuit svg{width:100%;height:auto;color:hsl(var(--h) 80% 62%);
  fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:.4s}
.cat-card:hover .cat-circuit svg{transform:scale(1.04)}
.cat-circuit svg{transition:transform .5s var(--ease)}
.cat-card p{font-size:.9rem;color:var(--text2)}
.cat-list{margin:1rem 0 1.2rem;display:grid;gap:.4rem}
.cat-list li{display:flex;align-items:center;gap:.55rem;font-size:.86rem;color:var(--text2)}
.cat-list li::before{content:"";width:6px;height:6px;border-radius:2px;background:var(--grad);flex:none}
.cat-more{font-family:var(--mono);font-size:.74rem;color:var(--accent);margin-top:.3rem}
.cat-link{margin-top:auto;display:inline-flex;align-items:center;gap:.45rem;font-weight:600;
  font-size:.9rem;color:var(--accent)}
.cat-link svg{transition:transform .3s var(--ease)}
.cat-card:hover .cat-link svg{transform:translateX(5px)}

/* ---------- FEATURED ---------- */
.featured-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.4rem}
.f-card{padding:1.6rem;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);
  backdrop-filter:blur(12px);transition:transform .35s var(--ease),box-shadow .35s,border-color .35s;position:relative}
.f-card:hover{transform:translateY(-6px);border-color:var(--accent);box-shadow:var(--shadow)}
.f-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.1rem}
.f-icon{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;background:var(--grad);color:#fff;
  box-shadow:0 10px 24px -10px var(--glow)}
.f-icon svg{width:28px;height:28px}
.f-card h3{font-size:1.08rem;margin-bottom:.3rem}
.f-card .f-cat{font-family:var(--mono);font-size:.72rem;color:var(--text2);letter-spacing:.06em}
.f-card p{font-size:.88rem;color:var(--text2);margin:.7rem 0 1.1rem}

/* ---------- WHY ---------- */
.why-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.3rem}
.why-card{padding:1.7rem;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);
  transition:transform .3s var(--ease),border-color .3s}
.why-card:hover{transform:translateY(-5px);border-color:var(--border2)}
.why-ic{font-size:1.7rem;display:block;margin-bottom:.9rem}
.why-card h3{font-size:1.05rem;margin-bottom:.45rem}
.why-card p{font-size:.9rem;color:var(--text2)}

/* ---------- TOOLS BAND ---------- */
.tools-band{position:relative;padding:3.6rem 0;background:var(--bg2);border-block:1px solid var(--border);overflow:hidden}
.tools-wave{position:absolute;inset:0;width:100%;height:100%;stroke:var(--accent);opacity:.12;fill:none;stroke-width:2}
.tools-wave path{stroke-dasharray:600 900;animation:waveDash 9s linear infinite}
@keyframes waveDash{to{stroke-dashoffset:-1500}}
.tools-row{position:relative;display:flex;justify-content:space-between;gap:1.5rem;flex-wrap:wrap}
.tool{flex:1;min-width:150px;text-align:center}
.tool-ic{font-size:2rem;display:block;margin-bottom:.7rem}
.tool h3{font-size:1.02rem}
.tool p{font-size:.85rem;color:var(--text2)}
.tool em{font-style:normal;font-family:var(--mono);font-size:.68rem;color:#fbbf24;text-transform:uppercase}

/* ---------- BENTO FEATURES ---------- */
.bento{display:grid;grid-template-columns:repeat(3,1fr);gap:1.3rem}
.b-card{padding:1.7rem;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);
  backdrop-filter:blur(12px);transition:transform .3s var(--ease),border-color .3s}
.b-card:hover{transform:translateY(-5px);border-color:var(--border2)}
.b-card h3{font-size:1.05rem;margin-bottom:.5rem}
.b-card p{font-size:.88rem;color:var(--text2)}
.b-lg{grid-row:span 2;display:flex;flex-direction:column}
.b-wide{grid-column:span 2}
.b-demo{margin-top:auto;padding-top:1.2rem}
.tt-demo{width:56px;height:30px;border-radius:999px;background:var(--grad);position:relative}
.tt-demo::after{content:"";position:absolute;top:3px;left:3px;width:22px;height:22px;border-radius:50%;
  background:var(--bg);animation:ttSlide 2.6s var(--ease) infinite alternate}
@keyframes ttSlide{to{transform:translateX(26px)}}
@media (max-width:820px){.bento{grid-template-columns:1fr 1fr}.b-wide{grid-column:span 2}}
@media (max-width:540px){.bento{grid-template-columns:1fr}.b-lg{grid-row:auto}.b-wide{grid-column:auto}}

/* ---------- STATS ---------- */
.stats{background:var(--grad);padding:3.4rem 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem;text-align:center}
.stat strong{display:block;font-size:clamp(2rem,4.5vw,3rem);font-weight:800;font-family:var(--mono);color:#fff}
.stat span{color:rgba(255,255,255,.85);font-size:.9rem}
@media (max-width:640px){.stats-grid{grid-template-columns:repeat(2,1fr)}}

/* ---------- FAQ ---------- */
.faq{display:grid;gap:.9rem}
.faq-item{background:var(--surface);border:1px solid var(--border);border-radius:14px;overflow:hidden;transition:border-color .3s}
.faq-item.open{border-color:var(--accent)}
.faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:1rem;
  padding:1.15rem 1.4rem;font-weight:600;font-size:1rem;text-align:left}
.faq-x{position:relative;width:16px;height:16px;flex:none}
.faq-x::before,.faq-x::after{content:"";position:absolute;background:var(--accent);border-radius:2px;
  top:50%;left:50%;transition:transform .35s var(--ease)}
.faq-x::before{width:14px;height:2px;transform:translate(-50%,-50%)}
.faq-x::after{width:2px;height:14px;transform:translate(-50%,-50%)}
.faq-item.open .faq-x::after{transform:translate(-50%,-50%) rotate(90deg) scaleY(0)}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .45s var(--ease)}
.faq-item.open .faq-a{grid-template-rows:1fr}
.faq-a>div{overflow:hidden}
.faq-a p{padding:0 1.4rem 1.2rem;color:var(--text2);font-size:.93rem}

/* ---------- CTA ---------- */
.cta-card{margin-top:2rem;text-align:center;padding:clamp(2.5rem,6vw,4rem);border-radius:24px;
  background:var(--surface);border:1px solid var(--border2);box-shadow:var(--shadow);
  position:relative;overflow:hidden}
.cta-card::before{content:"";position:absolute;inset:-40%;background:
  radial-gradient(420px 220px at 50% 0%,var(--glow),transparent 70%);pointer-events:none}
.cta-card h2{font-size:clamp(1.6rem,3.5vw,2.3rem);font-weight:800;position:relative}
.cta-card p{color:var(--text2);margin:.6rem 0 1.6rem;position:relative}

/* ---------- RESPONSIVE ---------- */
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr}
  .circuit-panel{max-width:560px;margin:0 auto}
  .hero-copy{text-align:center}
  .hero-copy .lead{margin-inline:auto}
  .hero-actions,.hero-meta{justify-content:center}
}
@media (max-width:560px){
  .hero-meta{gap:1.4rem}
  .btn{width:100%;justify-content:center}
  .hero-actions .btn{width:100%}
}
/* Shared <use> icon strokes */
.ci{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.cat-icon .ci{width:26px;height:26px}
.cat-tab .ci{width:16px;height:16px}
.f-icon .ci{width:28px;height:28px}
.cat-circuit svg{width:100%;height:auto}

/* Lively tweaks */
.tools-band{background:color-mix(in srgb,var(--bg2) 55%,transparent)}
/* The hero no longer needs its own grid (the global ambient grid covers it) */
.hero-bg{background:
  radial-gradient(700px 380px at 82% 18%,var(--glow),transparent 65%),
  radial-gradient(560px 340px at 8% 82%,rgba(139,92,246,.16),transparent 60%);
  background-size:none;
  -webkit-mask-image:none;mask-image:none}