/* HomeCalc — 2026 Design System */
:root{
  --primary:#2563eb;--primary-dark:#1d4ed8;--accent:#f59e0b;
  --bg:#f0f4f8;--card:rgba(255,255,255,0.7);--card-solid:#fff;
  --text:#0f172a;--text-light:#64748b;--border:rgba(255,255,255,0.5);
  --success:#10b981;--radius:16px;--radius-lg:24px;
  --shadow:0 1px 3px rgba(0,0,0,.06);
  --shadow-lg:0 20px 40px -12px rgba(0,0,0,.12);
  --shadow-glow:0 0 30px rgba(37,99,235,.15);
  --gradient-1:linear-gradient(135deg,#667eea 0%,#764ba2 100%);
  --gradient-2:linear-gradient(135deg,#f093fb 0%,#f5576c 100%);
  --gradient-3:linear-gradient(135deg,#4facfe 0%,#00f2fe 100%);
  --gradient-4:linear-gradient(135deg,#43e97b 0%,#38f9d7 100%);
  --gradient-5:linear-gradient(135deg,#fa709a 0%,#fee140 100%);
  --result-bg:linear-gradient(135deg,rgba(239,246,255,.9),rgba(240,253,244,.9));
  --result-border:rgba(191,219,254,.6);--result-row-border:rgba(219,234,254,.5);
  --cta-bg:rgba(255,251,235,.8);--cta-border:rgba(253,230,138,.5);--cta-text:#92400e;
  --table-head-bg:rgba(248,250,252,.8);--content-text:#334155;
}
[data-theme="dark"]{
  --bg:#0a0f1e;--card:rgba(30,41,59,.6);--card-solid:#1e293b;
  --text:#e2e8f0;--text-light:#94a3b8;--border:rgba(148,163,184,.15);
  --shadow:0 1px 3px rgba(0,0,0,.3);--shadow-lg:0 20px 40px -12px rgba(0,0,0,.5);
  --shadow-glow:0 0 30px rgba(59,130,246,.2);
  --result-bg:linear-gradient(135deg,rgba(30,58,95,.7),rgba(26,58,46,.7));
  --result-border:rgba(37,99,235,.3);--result-row-border:rgba(30,64,175,.3);
  --cta-bg:rgba(30,41,59,.7);--cta-border:rgba(120,53,15,.4);--cta-text:#fbbf24;
  --table-head-bg:rgba(15,23,42,.8);--content-text:#cbd5e1;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.6;
  min-height:100vh;position:relative;overflow-x:hidden;
}
/* Animated gradient background blobs */
body::before{
  content:'';position:fixed;top:-20%;left:-10%;width:60%;height:60%;
  background:radial-gradient(circle,rgba(102,126,234,.12) 0%,transparent 70%);
  border-radius:50%;z-index:-1;animation:float1 20s ease-in-out infinite;
}
body::after{
  content:'';position:fixed;bottom:-20%;right:-10%;width:50%;height:50%;
  background:radial-gradient(circle,rgba(245,158,11,.08) 0%,transparent 70%);
  border-radius:50%;z-index:-1;animation:float2 25s ease-in-out infinite;
}
@keyframes float1{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(10%,5%) scale(1.1)}}
@keyframes float2{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(-8%,-5%) scale(1.05)}}

.container{max-width:1080px;margin:0 auto;padding:0 20px}

/* Header - liquid glass */
header{
  background:var(--card);backdrop-filter:blur(20px) saturate(180%);
  -webkit-backdrop-filter:blur(20px) saturate(180%);
  border-bottom:1px solid var(--border);padding:12px 0;
  position:sticky;top:0;z-index:100;
}
header .container{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px}
.logo{font-size:1.3rem;font-weight:800;text-decoration:none;
  background:var(--gradient-1);-webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;letter-spacing:-.5px}
.logo span{background:var(--gradient-5);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
nav a{color:var(--text-light);text-decoration:none;margin-left:16px;font-size:.85rem;font-weight:500;transition:color .2s}
nav a:hover{color:var(--primary)}

/* Hero */
.hero{text-align:center;padding:48px 0 28px;position:relative}
.hero h1{
  font-size:clamp(2rem,5vw + .5rem,3.2rem);font-weight:800;margin-bottom:10px;
  letter-spacing:-.02em;line-height:1.1;
  background:linear-gradient(135deg,var(--text) 0%,var(--primary) 50%,var(--accent) 100%);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.hero p{color:var(--text-light);font-size:1.05rem;max-width:560px;margin:0 auto;font-weight:400}
.locale-note{color:var(--text-light);font-size:.78rem;max-width:680px;margin:8px auto 0;padding:7px 12px;border:1px solid var(--border);border-radius:8px;background:var(--card-solid)}

/* Glass card */
.calc-card{
  background:var(--card);backdrop-filter:blur(16px) saturate(160%);
  -webkit-backdrop-filter:blur(16px) saturate(160%);
  border:1px solid var(--border);border-radius:var(--radius-lg);
  box-shadow:var(--shadow-lg);padding:28px;margin-bottom:28px;
  transition:transform .3s ease,box-shadow .3s ease;
  position:relative;overflow:hidden;
}
.calc-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.6),transparent);
}
.calc-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-glow),var(--shadow-lg)}
.calc-card h2{font-size:1.25rem;margin-bottom:18px;font-weight:700;letter-spacing:-.01em}

/* Form */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:18px}
.form-group{display:flex;flex-direction:column}
.form-group.full{grid-column:1/-1}
.form-group label{font-size:.8rem;font-weight:600;color:var(--text-light);margin-bottom:6px;text-transform:uppercase;letter-spacing:.3px}
.form-group input,.form-group select{
  padding:11px 14px;border:1.5px solid var(--border);border-radius:10px;font-size:.95rem;
  background:var(--card-solid);color:var(--text);transition:all .25s ease;
}
.form-group input:focus,.form-group select:focus{
  outline:none;border-color:var(--primary);
  box-shadow:0 0 0 4px rgba(37,99,235,.12);
  transform:translateY(-1px);
}
.form-group .hint{font-size:.75rem;color:var(--text-light);margin-top:4px;font-style:italic}

/* Result box - glass */
.result-box{
  background:var(--result-bg);backdrop-filter:blur(10px);
  border:1px solid var(--result-border);border-radius:var(--radius);
  padding:22px;margin-top:16px;position:relative;overflow:hidden;
}
.result-box::after{
  content:'';position:absolute;top:-50%;right:-20%;width:40%;height:200%;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.1),transparent);
  transform:rotate(15deg);animation:shimmer 3s ease-in-out infinite;
}
@keyframes shimmer{0%,100%{opacity:0;transform:translateX(-100%) rotate(15deg)}50%{opacity:1;transform:translateX(200%) rotate(15deg)}}
.result-row{display:flex;justify-content:space-between;align-items:center;padding:10px 0;border-bottom:1px solid var(--result-row-border)}
.result-row:last-child{border-bottom:none}
.result-label{color:var(--text-light);font-size:.88rem;font-weight:500}
.result-value{font-size:1.25rem;font-weight:700;color:var(--primary-dark);font-variant-numeric:tabular-nums}
.result-value.highlight{
  font-size:1.6rem;font-weight:800;
  background:var(--gradient-4);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}

/* CTA box */
.cta-box{background:var(--cta-bg);border:1px solid var(--cta-border);border-radius:var(--radius);padding:16px 20px;margin-top:16px;display:flex;justify-content:space-between;align-items:center;gap:12px}
.cta-box p{font-size:.85rem;color:var(--cta-text)}
.cta-btn{background:var(--accent);color:#fff;padding:10px 20px;border-radius:10px;text-decoration:none;font-weight:600;font-size:.85rem;white-space:nowrap;transition:all .25s ease}
.cta-btn:hover{background:#d97706;transform:translateY(-1px);box-shadow:0 4px 12px rgba(245,158,11,.3)}

/* Content sections */
.content-section{
  background:var(--card);backdrop-filter:blur(12px);
  border:1px solid var(--border);border-radius:var(--radius-lg);
  box-shadow:var(--shadow);padding:28px;margin-bottom:20px;
}
.content-section h2{font-size:1.35rem;margin-bottom:16px;font-weight:700;letter-spacing:-.01em}
.content-section h3{font-size:1.1rem;margin:20px 0 10px;font-weight:600;color:var(--primary)}
.content-section p{margin-bottom:12px;color:var(--content-text);font-size:.92rem;line-height:1.7}
.content-section ul,.content-section ol{margin:0 0 14px 22px}
.content-section li{margin-bottom:6px;color:var(--content-text);font-size:.92rem}
.content-section table{width:100%;border-collapse:collapse;margin:16px 0;font-size:.85rem;border-radius:10px;overflow:hidden}
.content-section th,.content-section td{border:1px solid var(--border);padding:10px 12px;text-align:left}
.content-section th{background:var(--table-head-bg);font-weight:700;font-size:.8rem;text-transform:uppercase;letter-spacing:.3px}
.content-section tr:hover td{background:rgba(37,99,235,.04)}

/* FAQ */
.faq-item{border-bottom:1px solid var(--border);padding:16px 0}
.faq-item:last-child{border-bottom:none}
.faq-q{font-weight:600;margin-bottom:8px;font-size:.95rem;display:flex;align-items:flex-start;gap:8px}
.faq-q::before{content:'Q';background:var(--gradient-1);color:#fff;width:22px;height:22px;border-radius:6px;display:inline-flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:700;flex-shrink:0;margin-top:1px}
.faq-a{color:var(--text-light);font-size:.9rem;padding-left:30px}

/* Related cards */
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;margin-top:16px}
.related-card{
  background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px;
  text-decoration:none;color:var(--text);transition:all .3s ease;
}
.related-card:hover{border-color:var(--primary);box-shadow:var(--shadow-glow);transform:translateY(-3px)}
.related-card .icon{font-size:1.4rem;margin-bottom:8px}
.related-card .title{font-weight:600;font-size:.88rem}
.related-card .desc{font-size:.75rem;color:var(--text-light);margin-top:4px}

/* Footer */
footer{background:var(--card);backdrop-filter:blur(12px);border-top:1px solid var(--border);padding:24px 0;margin-top:40px;text-align:center;color:var(--text-light);font-size:.8rem}
footer a{color:var(--primary);text-decoration:none}

/* === BENTO GRID (homepage) === */
.bento-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:14px;
  margin:28px 0;grid-auto-flow:dense;
}
.bento-card{
  background:var(--card);backdrop-filter:blur(14px) saturate(160%);
  border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:22px;text-decoration:none;color:var(--text);
  transition:all .35s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden;
  display:flex;flex-direction:column;justify-content:space-between;min-height:140px;
}
.bento-card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;opacity:0;transition:opacity .3s}
.bento-card:hover{transform:translateY(-4px) scale(1.01);box-shadow:var(--shadow-glow),var(--shadow-lg)}
.bento-card:hover::before{opacity:1}
.bento-card .icon{font-size:2rem;margin-bottom:10px}
.bento-card h3{font-size:1rem;font-weight:700;margin-bottom:4px;letter-spacing:-.01em}
.bento-card p{font-size:.78rem;color:var(--text-light);line-height:1.4}
.bento-card .badge{font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px;padding:3px 8px;border-radius:20px;display:inline-block;margin-top:8px}
/* Uniform card sizes — all entries equal */
.bento-card{min-height:150px}
/* Bento accent colors */
.bento-card.acc-1::before{background:var(--gradient-1)}
.bento-card.acc-2::before{background:var(--gradient-2)}
.bento-card.acc-3::before{background:var(--gradient-3)}
.bento-card.acc-4::before{background:var(--gradient-4)}
.bento-card.acc-5::before{background:var(--gradient-5)}
.bento-card.acc-1 .badge{background:rgba(102,126,234,.12);color:#667eea}
.bento-card.acc-2 .badge{background:rgba(240,147,251,.12);color:#c026d3}
.bento-card.acc-3 .badge{background:rgba(79,172,254,.12);color:#0284c7}
.bento-card.acc-4 .badge{background:rgba(67,233,123,.12);color:#059669}
.bento-card.acc-5 .badge{background:rgba(250,112,154,.12);color:#db2777}

/* Category sections */
.category-section{margin-bottom:32px}
.category-title{
  font-size:1.1rem;font-weight:800;margin-bottom:14px;
  display:flex;align-items:center;gap:10px;letter-spacing:-.01em;
}
.category-title::before{
  content:'';width:4px;height:22px;border-radius:3px;
  background:var(--gradient-1);
}
.category-section.cat-interior .category-title::before{background:var(--gradient-1)}
.category-section.cat-hvac .category-title::before{background:var(--gradient-5)}
.category-section.cat-outdoor .category-title::before{background:var(--gradient-3)}
.category-section.cat-exterior .category-title::before{background:var(--gradient-2)}
.category-section.cat-materials .category-title::before{background:var(--gradient-4)}
.category-section.cat-general .category-title::before{background:var(--gradient-1)}
.category-title .count{font-size:.75rem;font-weight:600;color:var(--text-light);background:var(--card);padding:2px 10px;border-radius:20px;border:1px solid var(--border)}

/* Hub search */
.hub-search{position:relative;max-width:480px;margin:20px auto 0}
.hub-search input{
  width:100%;padding:14px 20px 14px 44px;border-radius:50px;border:1.5px solid var(--border);
  background:var(--card);backdrop-filter:blur(10px);font-size:.95rem;color:var(--text);
  transition:all .3s ease;
}
.hub-search input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 4px rgba(37,99,235,.1);transform:scale(1.02)}
.hub-search::before{content:'🔍';position:absolute;left:16px;top:50%;transform:translateY(-50%);font-size:1rem}

/* Category filter */
.hub-filters{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:16px 0}
.hub-filters button{
  padding:7px 16px;border-radius:50px;border:1.5px solid var(--border);background:var(--card);
  color:var(--text-light);font-size:.8rem;font-weight:600;cursor:pointer;transition:all .25s ease;
}
.hub-filters button:hover,.hub-filters button.active{border-color:var(--primary);color:var(--primary);background:rgba(37,99,235,.06)}

/* Author bar */
.author-bar{display:flex;align-items:center;gap:12px;padding:12px 18px;background:var(--card);border:1px solid var(--border);border-radius:12px;margin-bottom:18px;font-size:.82rem;color:var(--text-light)}
.author-bar .avatar{width:40px;height:40px;border-radius:50%;background:var(--gradient-1);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.9rem;box-shadow:0 4px 12px rgba(102,126,234,.3)}
.author-bar .name{font-weight:700;color:var(--text);font-size:.9rem}
.author-bar .role{font-size:.75rem}

/* PDF button */
.pdf-btn{
  display:inline-flex;align-items:center;gap:6px;
  background:var(--gradient-4);color:#fff;border:none;
  padding:10px 20px;border-radius:10px;font-size:.85rem;font-weight:700;
  cursor:pointer;margin-top:14px;transition:all .3s ease;
  box-shadow:0 4px 14px rgba(16,185,129,.25);
}
.pdf-btn:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(16,185,129,.35)}

/* Dynamic CTA */
.dynamic-cta{
  background:var(--result-bg);backdrop-filter:blur(10px);
  border:1px solid var(--result-border);border-radius:var(--radius);
  padding:18px 20px;margin-top:16px;
}
.dynamic-cta .product-name{font-weight:700;font-size:.95rem;margin-bottom:6px}
.dynamic-cta .product-detail{font-size:.82rem;color:var(--text-light);margin-bottom:12px;line-height:1.5}
.dynamic-cta .buy-btn{
  display:inline-block;background:var(--gradient-5);color:#fff;
  padding:9px 20px;border-radius:10px;text-decoration:none;font-weight:700;font-size:.85rem;
  transition:all .3s ease;box-shadow:0 4px 14px rgba(250,112,154,.25);
}
.dynamic-cta .buy-btn:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(250,112,154,.35)}

/* Step list */
.step-list{counter-reset:step;margin:14px 0;padding:0;list-style:none}
.step-list li{counter-increment:step;padding:10px 0 10px 42px;position:relative;font-size:.92rem;color:var(--content-text);line-height:1.6}
.step-list li::before{
  content:counter(step);position:absolute;left:0;top:10px;width:28px;height:28px;
  background:var(--gradient-1);color:#fff;border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-size:.78rem;font-weight:700;
  box-shadow:0 3px 10px rgba(102,126,234,.3);
}

/* Theme toggle */
.theme-toggle{
  background:var(--card);border:1px solid var(--border);border-radius:10px;
  padding:6px 12px;cursor:pointer;font-size:1rem;transition:all .25s ease;
}
.theme-toggle:hover{border-color:var(--primary);transform:scale(1.05)}

/* Language switcher */
/* Language dropdown */
.lang-select{
  padding:6px 28px 6px 10px;border-radius:10px;border:1.5px solid var(--border);
  background:var(--card);backdrop-filter:blur(10px);color:var(--text);
  font-size:.8rem;font-weight:600;cursor:pointer;appearance:none;
  -webkit-appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%2364748b'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 8px center;
  transition:all .25s ease;
}
.lang-select:hover{border-color:var(--primary)}
.lang-select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.1)}
.header-controls{display:flex;align-items:center;gap:10px}

/* Number count-up animation */
@keyframes countUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.result-value{animation:countUp .4s ease-out}

/* Fade-in on load */
@keyframes fadeInUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
.calc-card,.content-section,.hero{animation:fadeInUp .6s ease-out both}
.calc-card{animation-delay:.1s}
.content-section:nth-of-type(1){animation-delay:.2s}
.content-section:nth-of-type(2){animation-delay:.3s}

/* Responsive */
@media(max-width:768px){
  .bento-grid{grid-template-columns:repeat(2,1fr)}
  .bento-large{grid-column:span 2;grid-row:span 1;min-height:180px}
  .bento-wide{grid-column:span 2}
}
@media(max-width:640px){
  .form-grid{grid-template-columns:1fr}
  .hero h1{font-size:1.8rem}
  .calc-card{padding:20px}
  .cta-box{flex-direction:column;text-align:center}
  nav{display:none;width:100%}
  nav a{display:block;margin:6px 0}
  .header-controls{gap:6px}
  .lang-select{padding:4px 22px 4px 8px;font-size:.72rem}
  .bento-grid{grid-template-columns:1fr}
  .bento-large,.bento-wide{grid-column:span 1}
}