/* BizCalc - Professional Business Calculator Suite */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0a0a0f;--bg2:#12121a;--bg3:#1a1a2e;--bg4:#232340;
  --text:#e0e0e8;--text2:#a0a0b8;--accent:#4f8cff;--accent2:#6c5ce7;
  --green:#00e676;--red:#ff5252;--orange:#ffab40;--border:#2a2a40;
  --radius:12px;--shadow:0 4px 24px rgba(0,0,0,.4);
}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}
a{color:var(--accent);text-decoration:none;transition:color .2s}
a:hover{color:#7aafff}
img{max-width:100%}

/* Nav */
.nav{background:var(--bg2);border-bottom:1px solid var(--border);padding:1rem 2rem;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100;backdrop-filter:blur(12px)}
.nav-brand{font-size:1.4rem;font-weight:800;color:#fff}
.nav-brand span{color:var(--accent)}
.nav-links{display:flex;gap:1.5rem;align-items:center}
.nav-links a{color:var(--text2);font-size:.9rem;font-weight:500}
.nav-links a:hover{color:#fff}
.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.65rem 1.5rem;border-radius:8px;font-weight:600;font-size:.9rem;border:none;cursor:pointer;transition:all .2s}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:#3a7aee;transform:translateY(-1px)}
.btn-accent{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff}
.btn-accent:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(79,140,255,.3)}
.btn-outline{border:1.5px solid var(--accent);color:var(--accent);background:transparent}
.btn-outline:hover{background:var(--accent);color:#fff}
.btn-lg{padding:.85rem 2rem;font-size:1.05rem}

/* Hero */
.hero{padding:5rem 2rem;text-align:center;background:radial-gradient(ellipse at center top,rgba(79,140,255,.08),transparent 70%)}
.hero h1{font-size:3rem;font-weight:800;margin-bottom:1rem;line-height:1.15}
.hero h1 span{background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero p{font-size:1.2rem;color:var(--text2);max-width:640px;margin:0 auto 2rem}

/* Grid */
.container{max-width:1200px;margin:0 auto;padding:0 2rem}
.grid{display:grid;gap:1.5rem}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(400px,1fr))}

/* Cards */
.card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:2rem;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.card-icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:1rem;background:rgba(79,140,255,.12)}
.card h3{font-size:1.2rem;margin-bottom:.5rem}
.card p{color:var(--text2);font-size:.95rem}

/* Calculator pages */
.calc-page{padding:3rem 2rem}
.calc-container{max-width:900px;margin:0 auto}
.calc-header{margin-bottom:2rem}
.calc-header h1{font-size:2.2rem;font-weight:800;margin-bottom:.5rem}
.calc-header p{color:var(--text2);font-size:1.05rem}
.calc-body{display:grid;grid-template-columns:1fr 1fr;gap:2rem}
.calc-inputs{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:2rem}
.calc-results{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:2rem}
.form-group{margin-bottom:1.25rem}
.form-group label{display:block;font-size:.85rem;font-weight:600;color:var(--text2);margin-bottom:.4rem;text-transform:uppercase;letter-spacing:.5px}
.form-group input,.form-group select{width:100%;padding:.7rem 1rem;background:var(--bg);border:1px solid var(--border);border-radius:8px;color:var(--text);font-size:1rem;transition:border-color .2s}
.form-group input:focus,.form-group select:focus{outline:none;border-color:var(--accent)}
.calc-btn{width:100%;padding:.85rem;background:var(--accent);color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:background .2s}
.calc-btn:hover{background:#3a7aee}
.result-item{background:var(--bg);border-radius:8px;padding:1.2rem;margin-bottom:1rem}
.result-label{font-size:.8rem;color:var(--text2);text-transform:uppercase;letter-spacing:.5px;margin-bottom:.3rem}
.result-value{font-size:1.8rem;font-weight:800}
.result-positive{color:var(--green)}
.result-negative{color:var(--red)}
.result-neutral{color:var(--accent)}
.chart-container{margin-top:1.5rem;background:var(--bg);border-radius:8px;padding:1rem}
.chart-container canvas{max-height:260px}

/* Pro page */
.pro-hero{padding:5rem 2rem;text-align:center;background:radial-gradient(ellipse at center,rgba(108,92,231,.1),transparent 70%)}
.pro-hero h1{font-size:2.8rem;font-weight:800;margin-bottom:1rem}
.price-tag{font-size:3.5rem;font-weight:800;color:var(--green);margin:1.5rem 0}
.price-tag small{font-size:1rem;color:var(--text2);font-weight:400}
.features-list{list-style:none;text-align:left;max-width:500px;margin:2rem auto}
.features-list li{padding:.6rem 0;font-size:1.05rem;display:flex;align-items:center;gap:.75rem}
.features-list li::before{content:"✓";color:var(--green);font-weight:700;font-size:1.2rem}

/* CTA Banner */
.cta-banner{background:linear-gradient(135deg,var(--bg3),var(--bg4));border:1px solid var(--border);border-radius:var(--radius);padding:2.5rem;text-align:center;margin:3rem 0}
.cta-banner h3{font-size:1.4rem;margin-bottom:.5rem}
.cta-banner p{color:var(--text2);margin-bottom:1.25rem}

/* FAQ */
.faq-section{padding:3rem 0}
.faq-item{border-bottom:1px solid var(--border);padding:1.25rem 0}
.faq-q{font-weight:700;font-size:1.05rem;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.faq-q::after{content:"+";font-size:1.3rem;color:var(--accent)}
.faq-q.open::after{content:"-"}
.faq-a{color:var(--text2);max-height:0;overflow:hidden;transition:max-height .3s,padding .3s}
.faq-a.open{max-height:300px;padding-top:.75rem}

/* Footer */
.footer{background:var(--bg2);border-top:1px solid var(--border);padding:2.5rem 2rem;text-align:center;color:var(--text2);font-size:.85rem;margin-top:4rem}

/* Landing pages */
.landing-hero{padding:5rem 2rem 3rem;text-align:center}
.landing-hero h1{font-size:2.5rem;font-weight:800;margin-bottom:1rem}
.landing-hero p{font-size:1.15rem;color:var(--text2);max-width:600px;margin:0 auto 2rem}

/* Responsive */
@media(max-width:768px){
  .hero h1{font-size:2rem}
  .calc-body{grid-template-columns:1fr}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .nav{padding:.8rem 1rem}
  .nav-links{gap:.75rem}
  .nav-links a{font-size:.8rem}
  .pro-hero h1{font-size:2rem}
  .price-tag{font-size:2.5rem}
  .landing-hero h1{font-size:1.8rem}
}
@media(max-width:480px){
  .hero{padding:3rem 1rem}
  .calc-page{padding:2rem 1rem}
  .btn-lg{padding:.7rem 1.5rem;font-size:.95rem}
}