/* ============================================
   VoltGo 2026 Redesign
   Designer-grade stylesheet
   Trends: Bento Grid, Glassmorphism, 
           Micro-interactions, Dark-mode-first
   ============================================ */

/* --- Design Tokens --- */
:root {
  /* Core palette — dark-mode first */
  --bg:          #08090D;
  --bg-card:     #111318;
  --bg-card-hover: #181A20;
  --bg-glass:    rgba(255,255,255,.04);
  --border:      rgba(255,255,255,.08);
  --border-hover:rgba(255,255,255,.15);

  /* Accent */
  --accent:      #4B7BFF;
  --accent-light:#7BA3FF;
  --accent-glow: rgba(75,123,255,.25);
  --accent2:     #00D4AA;
  --accent2-glow:rgba(0,212,170,.15);

  /* Text */
  --text:        #E8EAED;
  --text-dim:    #9AA0A6;
  --text-dimmer: #5F6368;

  /* Sizes */
  --radius:      16px;
  --radius-sm:   10px;
  --radius-xs:   6px;
  --max-w:       1200px;
  --header-h:    72px;

  /* Font */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'SF Mono', 'Fira Code', monospace;

  /* Transitions */
  --ease:        cubic-bezier(.22,1,.36,1);
  --fast:         .18s;
  --smooth:        .35s;
}

/* --- Reset --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:var(--header-h)}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:var(--accent-light);text-decoration:none;transition:color var(--fast)}
a:hover{color:var(--accent)}
img{max-width:100%;display:block}
button,input,select,textarea{font-family:inherit}
ul,ol{list-style:none;padding:0}

/* Selection */
::selection{background:var(--accent);color:#fff}

/* Custom scrollbar */
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--text-dimmer);border-radius:3px}

/* --- Utility --- */
.container{max-width:var(--max-w);margin:0 auto;padding:0 clamp(1.25rem,5vw,3rem)}
.section{padding:clamp(4rem,8vw,7rem) 0}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}

/* --- Top Bar --- */
.topbar{
  background:rgba(8,9,13,.85);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
  font-size:.75rem;
  color:var(--text-dim);
  padding:.4rem 0;
  position:relative;
  z-index:200;
}
.topbar .container{display:flex;justify-content:space-between;align-items:center}
.topbar a{color:var(--text-dim);font-weight:500}
.topbar a:hover{color:var(--text)}

/* --- Header / Nav --- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(8,9,13,.82);
  backdrop-filter:blur(20px) saturate(1.4);
  -webkit-backdrop-filter:blur(20px) saturate(1.4);
  border-bottom:1px solid var(--border);
  transition:background var(--smooth),box-shadow var(--smooth);
}
.site-header.scrolled{box-shadow:0 1px 0 var(--border),0 4px 24px rgba(0,0,0,.3)}
.site-header .container{
  display:flex;align-items:center;justify-content:space-between;
  height:var(--header-h);
}
.logo{
  display:flex;align-items:center;gap:.6rem;
  font-weight:800;font-size:1.2rem;letter-spacing:-.03em;
  color:var(--text);
}
.logo svg{width:34px;height:34px;flex-shrink:0}
.logo span{background:linear-gradient(135deg,#4B7BFF,#7BA3FF);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

/* Nav */
.nav{display:flex;align-items:center;gap:2.25rem}
.nav a{
  color:var(--text-dim);font-size:.875rem;font-weight:500;
  position:relative;padding:.25rem 0;
  transition:color var(--fast);
}
.nav a::after{
  content:'';position:absolute;bottom:-2px;left:0;right:0;height:1.5px;
  background:var(--accent);border-radius:1px;
  transform:scaleX(0);transform-origin:center;
  transition:transform var(--smooth);
}
.nav a:hover,.nav a.active{color:var(--text)}
.nav a:hover::after,.nav a.active::after{transform:scaleX(1)}
.nav-cta{
  background:var(--accent);color:#fff !important;
  padding:.55rem 1.25rem;border-radius:var(--radius-xs);font-weight:600;
  font-size:.85rem;
  box-shadow:0 0 20px var(--accent-glow);
  transition:background var(--fast),box-shadow var(--fast),transform var(--fast) !important;
}
.nav-cta::after{display:none !important}
.nav-cta:hover{background:#5B8BFF;box-shadow:0 0 32px var(--accent-glow);transform:translateY(-1px);text-decoration:none !important}

/* Mobile toggle */
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:.5rem}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--text);margin:5px 0;transition:var(--fast)}
@media(max-width:840px){
  .nav-toggle{display:block}
  .nav{
    display:none;position:fixed;top:0;left:0;right:0;bottom:0;
    flex-direction:column;justify-content:center;align-items:center;gap:2rem;
    background:rgba(8,9,13,.97);backdrop-filter:blur(24px);
    z-index:99;
  }
  .nav.open{display:flex}
  .nav a{font-size:1.25rem}
}

/* --- Buttons --- */
.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.8rem 1.75rem;border-radius:var(--radius-xs);
  font-weight:600;font-size:.95rem;cursor:pointer;
  border:none;transition:all var(--smooth);
  position:relative;overflow:hidden;
}
.btn-primary{
  background:var(--accent);color:#fff;
  box-shadow:0 0 24px var(--accent-glow);
}
.btn-primary:hover{background:#5B8BFF;box-shadow:0 0 40px var(--accent-glow);transform:translateY(-2px);color:#fff !important;text-decoration:none}
.btn-outline{
  background:transparent;color:var(--text);
  border:1.5px solid var(--border);
}
.btn-outline:hover{border-color:var(--text-dim);background:var(--bg-glass);text-decoration:none;color:var(--text)}
.btn-sm{padding:.55rem 1.15rem;font-size:.85rem}

/* Amazon CTA */
.btn-amazon{
  display:flex;align-items:center;justify-content:center;gap:.5rem;
  width:100%;padding:.7rem;border-radius:var(--radius-xs);
  background:linear-gradient(135deg,#FF9900,#FF8C00);
  color:#1a1a1a !important;font-weight:700;font-size:.88rem;
  transition:all var(--smooth);
  text-decoration:none !important;
}
.btn-amazon:hover{background:linear-gradient(135deg,#FF8C00,#e67c00);transform:translateY(-1px);box-shadow:0 4px 16px rgba(255,153,0,.3)}

/* --- Hero (2026: bold, minimal, gradient backdrop) --- */
.hero{
  position:relative;
  padding:clamp(5rem,10vw,9rem) 0 clamp(4rem,7vw,7rem);
  text-align:center;overflow:hidden;
}
/* Animated gradient orb background */
.hero::before{
  content:'';position:absolute;top:-30%;left:50%;transform:translateX(-50%);
  width:clamp(500px,70vw,900px);height:clamp(500px,70vw,900px);
  background:radial-gradient(circle,rgba(75,123,255,.12) 0%,rgba(75,123,255,.04) 40%,transparent 70%);
  pointer-events:none;z-index:0;
  animation:orb-float 8s ease-in-out infinite alternate;
}
@keyframes orb-float{
  0%{transform:translateX(-50%) translateY(0) scale(1)}
  100%{transform:translateX(-50%) translateY(30px) scale(1.05)}
}
.hero .container{position:relative;z-index:1}
.hero-badge{
  display:inline-flex;align-items:center;gap:.5rem;
  background:var(--bg-glass);border:1px solid var(--border);
  padding:.4rem 1rem;border-radius:100px;
  font-size:.8rem;font-weight:600;color:var(--accent-light);
  margin-bottom:1.5rem;
  animation:fade-up .6s var(--ease) both;
}
.hero h1{
  font-size:clamp(2.5rem,6.5vw,4.5rem);
  font-weight:800;letter-spacing:-.04em;line-height:1.1;
  margin-bottom:1.25rem;
  animation:fade-up .6s .1s var(--ease) both;
}
.hero h1 .gradient{
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.hero p{
  font-size:clamp(1rem,2vw,1.2rem);
  color:var(--text-dim);max-width:560px;margin:0 auto 2rem;
  animation:fade-up .6s .2s var(--ease) both;
}
.hero-btns{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;animation:fade-up .6s .3s var(--ease) both}
@keyframes fade-up{
  from{opacity:0;transform:translateY(20px)}
  to{opacity:1;transform:translateY(0)}
}

/* --- Section Headers --- */
.section-label{
  display:inline-flex;align-items:center;gap:.4rem;
  font-size:.72rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;
  color:var(--accent-light);margin-bottom:.75rem;
}
.section-label::before{content:'';display:block;width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 8px var(--accent-glow)}
.section-title{margin-bottom:clamp(2rem,4vw,3.5rem)}
.section-title h2{font-size:clamp(1.75rem,4vw,2.75rem);font-weight:800;letter-spacing:-.03em;line-height:1.2}
.section-title p{color:var(--text-dim);margin-top:.5rem;max-width:520px}
.section-title.center{text-align:center}
.section-title.center p{margin-left:auto;margin-right:auto}

/* --- Bento Grid (2026 core trend) --- */
.bento-grid{display:grid;gap:1rem}
.bento-grid.cols-3{grid-template-columns:repeat(3,1fr)}
.bento-grid.cols-2{grid-template-columns:repeat(2,1fr)}
.bento-grid.cols-4{grid-template-columns:repeat(4,1fr)}

.bento-card{
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:clamp(1.25rem,3vw,2rem);
  transition:all var(--smooth);
  position:relative;overflow:hidden;
}
.bento-card::before{
  content:'';position:absolute;inset:0;
  background:radial-gradient(600px circle at var(--mx,50%) var(--my,50%),rgba(75,123,255,.06),transparent 60%);
  opacity:0;transition:opacity var(--smooth);pointer-events:none;
}
.bento-card:hover{border-color:var(--border-hover);transform:translateY(-2px)}
.bento-card:hover::before{opacity:1}

.bento-card .icon{
  width:48px;height:48px;border-radius:var(--radius-sm);
  background:rgba(75,123,255,.1);
  display:flex;align-items:center;justify-content:center;
  font-size:1.25rem;margin-bottom:1rem;
}
.bento-card h3{font-size:1.05rem;font-weight:700;margin-bottom:.5rem;letter-spacing:-.01em}
.bento-card p{font-size:.9rem;color:var(--text-dim);line-height:1.55}

/* Featured bento (large card) */
.bento-card.featured{
  grid-column:span 2;
  display:flex;flex-direction:column;justify-content:flex-end;
  min-height:280px;
  background:linear-gradient(135deg,var(--bg-card),rgba(75,123,255,.08));
}
.bento-card.featured h3{font-size:1.35rem}

/* --- Product Grid (Redesigned) --- */
.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.25rem}

.product-card{
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  overflow:hidden;
  transition:all var(--smooth);
  display:flex;flex-direction:column;
}
.product-card:hover{border-color:var(--border-hover);transform:translateY(-4px);box-shadow:0 12px 40px rgba(0,0,0,.3)}
.product-card-img{
  position:relative;overflow:hidden;
  background:var(--bg-glass);
  padding:1.5rem;display:flex;align-items:center;justify-content:center;
  min-height:220px;
}
.product-card-img img{
  width:100%;height:180px;object-fit:contain;
  transition:transform var(--smooth);
}
.product-card:hover .product-card-img img{transform:scale(1.05)}
.product-card-badge{
  position:absolute;top:1rem;left:1rem;
  background:var(--accent);color:#fff;
  padding:.25rem .65rem;border-radius:100px;
  font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;
}
.product-card-body{padding:1.25rem 1.5rem 1.5rem;flex:1;display:flex;flex-direction:column}
.product-card-body h3{font-size:1.05rem;font-weight:700;margin-bottom:.35rem;letter-spacing:-.01em}
.product-card-body .price{font-size:.95rem;font-weight:700;color:var(--accent-light);margin-bottom:.25rem}
.product-card-body p{font-size:.85rem;color:var(--text-dim);flex:1;margin-bottom:1rem;line-height:1.5}
.product-card-body .specs{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:1rem}
.product-card-body .specs span{
  font-size:.7rem;font-weight:600;
  background:var(--bg-glass);border:1px solid var(--border);
  padding:.2rem .55rem;border-radius:100px;color:var(--text-dim);
}

/* --- Amazon Reminder Banner --- */
.amzn-reminder{
  background:rgba(255,153,0,.08);border:1px solid rgba(255,153,0,.2);
  border-radius:var(--radius-sm);
  padding:1rem 1.5rem;margin-bottom:2.5rem;
  font-size:.88rem;color:#FFB74D;line-height:1.5;
}
.amzn-reminder strong{color:#FFD54F}

/* --- FAQ Accordion --- */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{
  border-bottom:1px solid var(--border);
  padding:1.25rem 0;cursor:pointer;
}
.faq-item:first-child{padding-top:0}
.faq-q{
  display:flex;justify-content:space-between;align-items:center;
  font-size:1rem;font-weight:600;letter-spacing:-.01em;
}
.faq-q .arrow{
  width:24px;height:24px;border-radius:50%;
  background:var(--bg-glass);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  font-size:.7rem;transition:all var(--fast);flex-shrink:0;
}
.faq-item.open .arrow{background:var(--accent);border-color:var(--accent);color:#fff;transform:rotate(180deg)}
.faq-a{
  max-height:0;overflow:hidden;
  transition:max-height .4s var(--ease),padding .4s var(--ease);
  padding:0 0 0;
}
.faq-item.open .faq-a{max-height:400px;padding:1rem 0 0}
.faq-a p{font-size:.92rem;color:var(--text-dim);line-height:1.6}

/* --- Form (2026: glassmorphism inputs) --- */
.form-wrap{max-width:600px;margin:0 auto}
.form-group{margin-bottom:1.5rem}
.form-group label{display:block;font-size:.85rem;font-weight:600;margin-bottom:.45rem;color:var(--text-dim)}
.form-group input,
.form-group select,
.form-group textarea{
  width:100%;padding:.8rem 1rem;
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-sm);
  color:var(--text);font-size:.95rem;
  transition:border-color var(--fast),box-shadow var(--fast);
  appearance:none;-webkit-appearance:none;
}
.form-group select{
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%239AA0A6' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 1rem center;
  padding-right:2.5rem;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus{
  outline:none;border-color:var(--accent);
  box-shadow:0 0 0 3px var(--accent-glow);
}
.form-group textarea{resize:vertical;min-height:110px}
.form-group .hint{font-size:.75rem;color:var(--text-dimmer);margin-top:.3rem}

/* --- Contact Cards --- */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.25rem}
.contact-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:1.75rem;
  transition:all var(--smooth);
}
.contact-card:hover{border-color:var(--border-hover)}
.contact-card .icon{font-size:1.5rem;margin-bottom:1rem}
.contact-card h3{font-size:1.1rem;font-weight:700;margin-bottom:.5rem}
.contact-card p{font-size:.88rem;color:var(--text-dim);line-height:1.55}
.contact-card a{font-weight:600}

/* --- Page Header (2026: minimal, gradient text) --- */
.page-hero{
  padding:clamp(4rem,8vw,6rem) 0 clamp(3rem,5vw,4rem);
  text-align:center;position:relative;overflow:hidden;
}
.page-hero::before{
  content:'';position:absolute;top:0;left:50%;transform:translateX(-50%);
  width:800px;height:400px;
  background:radial-gradient(ellipse,rgba(75,123,255,.08),transparent 70%);
  pointer-events:none;
}
.page-hero .container{position:relative;z-index:1}
.page-hero h1{font-size:clamp(2rem,5vw,3.5rem);font-weight:800;letter-spacing:-.04em;margin-bottom:.75rem}
.page-hero p{color:var(--text-dim);max-width:540px;margin:0 auto;font-size:1.05rem}

/* --- Footer (2026: more spacing, less corporate) --- */
.site-footer{
  background:var(--bg-card);border-top:1px solid var(--border);
  padding:clamp(3rem,6vw,5rem) 0 2rem;font-size:.9rem;
}
.footer-grid{display:grid;grid-template-columns:2fr repeat(3,1fr);gap:clamp(1.5rem,4vw,3rem);margin-bottom:3rem}
.footer-brand .logo{margin-bottom:1rem}
.footer-brand p{color:var(--text-dimmer);max-width:280px;font-size:.88rem;line-height:1.6}
.footer-col h4{font-size:.72rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--text-dim);margin-bottom:1rem}
.footer-col li{margin-bottom:.6rem}
.footer-col a{color:var(--text-dimmer);font-size:.9rem;transition:color var(--fast)}
.footer-col a:hover{color:var(--text)}
.footer-bottom{
  border-top:1px solid var(--border);padding-top:1.5rem;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:.75rem;
  font-size:.8rem;color:var(--text-dimmer);
}
.footer-bottom a{color:var(--text-dimmer)}
.footer-bottom a:hover{color:var(--text)}

/* --- Privacy page --- */
.privacy-content{max-width:760px;margin:0 auto}
.privacy-content h2{font-size:1.35rem;font-weight:700;margin-top:2.5rem;margin-bottom:.75rem;letter-spacing:-.01em}
.privacy-content p,.privacy-content li{color:var(--text-dim);font-size:.93rem;line-height:1.65;margin-bottom:.75rem}
.privacy-content ul{padding-left:1.25rem}
.privacy-content li{list-style:disc}

/* --- Manual list --- */
.manual-list{border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden}
.manual-item{
  display:flex;justify-content:space-between;align-items:center;
  padding:1rem 1.5rem;
  border-bottom:1px solid var(--border);
  transition:background var(--fast);
}
.manual-item:last-child{border-bottom:none}
.manual-item:hover{background:var(--bg-glass)}
.manual-item .name{font-weight:600;font-size:.95rem}
.manual-item .model{font-size:.8rem;color:var(--text-dimmer);font-family:var(--mono)}
.manual-item .dl-btn{
  font-size:.82rem;font-weight:600;
  background:var(--bg-glass);border:1px solid var(--border);
  padding:.4rem .9rem;border-radius:var(--radius-xs);
  transition:all var(--fast);
}
.manual-item .dl-btn:hover{background:var(--accent);border-color:var(--accent);color:#fff}

/* --- Partner cards --- */
.partner-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:1.25rem}
.partner-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:2rem;
  transition:all var(--smooth);position:relative;overflow:hidden;
}
.partner-card::after{
  content:'';position:absolute;top:0;right:0;
  width:120px;height:120px;
  background:radial-gradient(circle at 70% 30%,var(--accent-glow),transparent 70%);
  opacity:0;transition:opacity var(--smooth);pointer-events:none;
}
.partner-card:hover{border-color:var(--border-hover);transform:translateY(-2px)}
.partner-card:hover::after{opacity:1}
.partner-card h3{font-size:1.1rem;font-weight:700;margin-bottom:.5rem}
.partner-card p{font-size:.9rem;color:var(--text-dim);line-height:1.55;margin-bottom:1rem}
.partner-card .link{font-size:.88rem;font-weight:600;display:inline-flex;align-items:center;gap:.35rem}

/* --- Responsive --- */
@media(max-width:1024px){
  .bento-grid.cols-3,.bento-grid.cols-4{grid-template-columns:repeat(2,1fr)}
  .bento-card.featured{grid-column:span 2}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .bento-grid.cols-2,.bento-grid.cols-3,.bento-grid.cols-4{grid-template-columns:1fr}
  .bento-card.featured{grid-column:span 1}
  .footer-grid{grid-template-columns:1fr}
  .hero h1{letter-spacing:-.02em}
  .product-grid{grid-template-columns:1fr}
}

/* --- Scroll reveal animation (add .reveal class via JS) --- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.visible{opacity:1;transform:translateY(0)}