:root{
  --bg:#f8fafc;
  --surface:#ffffff;
  --text:#0f172a;
  --muted:#475569;
  --line:#e2e8f0;
  --primary:#0f172a;
  --accent:#2563eb;
  --shadow:0 14px 40px rgba(15,23,42,0.08);
  --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.5;
}
a{text-decoration:none;color:inherit}
.container{width:min(1160px, calc(100% - 32px));margin:0 auto}
.topbar{
  position:sticky;top:0;z-index:10;
  backdrop-filter:blur(12px);
  background:rgba(248,250,252,0.85);
  border-bottom:1px solid rgba(226,232,240,0.8);
}
.topbar-inner{
  display:flex;align-items:center;justify-content:space-between;padding:16px 0;
}
.brand{font-size:1.2rem;font-weight:800;letter-spacing:-0.02em}
.nav{display:flex;gap:20px;color:var(--muted)}
.hero{padding:72px 0 40px}
.hero-grid{
  display:grid;grid-template-columns:1.15fr 0.85fr;gap:32px;align-items:center;
}
.eyebrow{
  display:inline-block;padding:8px 12px;border-radius:999px;background:#dbeafe;color:#1d4ed8;
  font-weight:700;font-size:.9rem;margin-bottom:12px;
}
h1,h2,h3{line-height:1.1;margin:0 0 14px}
h1{font-size:clamp(2rem, 4.2vw, 4rem);letter-spacing:-0.04em}
h2{font-size:clamp(1.7rem, 3vw, 2.6rem);letter-spacing:-0.03em}
.hero-copy,.section-head p,.card p,.faq p{color:var(--muted)}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0}
.btn{
  display:inline-flex;align-items:center;justify-content:center;border:none;cursor:pointer;
  padding:14px 18px;border-radius:14px;font-weight:700;font-size:.96rem;transition:.2s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--primary);color:#fff}
.btn-secondary{background:#fff;border:1px solid var(--line);color:var(--text)}
.btn-small{padding:10px 14px;font-size:.9rem}
.hero-points{
  list-style:none;padding:0;margin:18px 0 0;display:grid;gap:10px;color:var(--muted)
}
.hero-points li::before{content:"✓ ";color:#16a34a;font-weight:800}
.hero-card,.panel,.card{
  background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:var(--radius)
}
.hero-card{padding:24px}
.mini-invoice{background:linear-gradient(180deg,#fff,#f8fafc);padding:24px;border-radius:16px;border:1px solid var(--line)}
.mini-header,.mini-total,.mini-lines div{
  display:flex;justify-content:space-between;gap:12px
}
.mini-lines{display:grid;gap:12px;margin:18px 0}
.generator-section,.features,.faq{padding:40px 0 80px}
.section-head{margin-bottom:24px}
.app-layout{display:grid;grid-template-columns:1fr 0.95fr;gap:24px;align-items:start}
.panel{padding:22px}
.grid{display:grid;gap:14px;margin-bottom:14px}
.grid.two{grid-template-columns:1fr 1fr}
.grid.three{grid-template-columns:repeat(3,1fr)}
label{display:block;font-weight:700;font-size:.95rem}
input,select,textarea{
  width:100%;margin-top:8px;border:1px solid var(--line);background:#fff;border-radius:14px;
  padding:14px 14px;font:inherit;color:var(--text)
}
textarea{resize:vertical;min-height:110px}
.items-head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;margin:18px 0 12px
}
.items-container{display:grid;gap:12px}
.item-row{
  display:grid;grid-template-columns:2fr .8fr .8fr auto;gap:10px;align-items:end;
  border:1px solid var(--line);padding:12px;border-radius:16px;background:#fcfdff;
}
.remove-item{
  height:48px;width:48px;border:none;border-radius:14px;background:#fee2e2;color:#b91c1c;
  font-size:1.1rem;cursor:pointer
}
.form-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}
.invoice-preview{
  background:#fff;border:1px solid var(--line);border-radius:16px;padding:26px;min-height:680px
}
.preview-header,.preview-people,.preview-totals .row,.preview-item{
  display:flex;justify-content:space-between;gap:12px
}
.preview-header{align-items:flex-start;border-bottom:1px solid var(--line);padding-bottom:18px}
.preview-title{font-size:1.8rem;font-weight:800}
.preview-meta{color:var(--muted);font-size:.95rem}
.preview-people{padding:18px 0;border-bottom:1px solid var(--line)}
.preview-person h4{margin:0 0 8px}
.preview-items{padding:18px 0;border-bottom:1px solid var(--line)}
.preview-item{padding:10px 0;border-bottom:1px dashed #e5e7eb}
.preview-item:last-child{border-bottom:none}
.preview-totals{padding-top:18px;display:grid;gap:10px}
.preview-totals .grand{font-size:1.08rem;font-weight:800}
.features .cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{padding:22px}
.faq-list{display:grid;gap:14px}
details{
  background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px 18px
}
summary{cursor:pointer;font-weight:700}
.footer{padding:28px 0;border-top:1px solid var(--line);color:var(--muted)}
code{background:#eff6ff;padding:2px 6px;border-radius:8px}
@media (max-width: 980px){
  .hero-grid,.app-layout,.features .cards{grid-template-columns:1fr}
}
@media (max-width: 720px){
  .nav{display:none}
  .grid.two,.grid.three,.item-row{grid-template-columns:1fr}
}