:root{
  --canvas:#F5F6F3;
  --ink:#16233D;
  --green:#1E7A5F;
  --stamp:#B84A3E;
  --slate:#5C6577;
  --white:#FFFFFF;
  --paper-line:#E4E1D6;

  --font-display:'Fraunces', serif;
  --font-body:'Inter', -apple-system, sans-serif;
  --font-mono:'IBM Plex Mono', monospace;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--canvas);
  color:var(--ink);
  font-family:var(--font-body);
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:1160px;margin:0 auto;padding:0 1.5rem;}
h1,h2,h3{font-family:var(--font-display);font-weight:600;color:var(--ink);margin:0 0 .5rem;}
a{color:inherit;}
img{max-width:100%;display:block;}
:focus-visible{outline:2px solid var(--green);outline-offset:2px;}

/* ---------- Header ---------- */
.site-header{background:var(--white);border-bottom:1px solid var(--paper-line);position:sticky;top:0;z-index:20;}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;}
.logo{display:flex;align-items:center;gap:.5rem;font-family:var(--font-display);font-weight:600;font-size:1.15rem;text-decoration:none;color:var(--ink);}
.logo-mark{font-size:1.3rem;}
.site-nav{display:flex;gap:1.75rem;}
.site-nav a{text-decoration:none;font-size:.92rem;font-weight:500;color:var(--slate);}
.site-nav a:hover{color:var(--ink);}

/* ---------- Hero ---------- */
.hero{display:grid;grid-template-columns:0.85fr 1.15fr;gap:3rem;padding:3.5rem 1.5rem 4rem;align-items:start;}
@media (max-width:980px){.hero{grid-template-columns:1fr;padding-top:2.25rem;}}

.eyebrow{font-family:var(--font-mono);font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;color:var(--green);margin:0 0 .9rem;}
.hero h1{font-size:clamp(2rem,4vw,2.9rem);line-height:1.1;letter-spacing:-.01em;}
.hero-sub{color:var(--slate);font-size:1.05rem;max-width:46ch;margin-bottom:1.5rem;}
.trust-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.6rem;}
.trust-list li{position:relative;padding-left:1.4rem;color:var(--ink);font-size:.92rem;}
.trust-list li::before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:700;}

/* ---------- Tool ---------- */
.tool-shell{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;}
@media (max-width:760px){.tool-shell{grid-template-columns:1fr;}}

.tool-panel{background:var(--white);border:1px solid var(--paper-line);border-radius:16px;padding:1.5rem;}
.field{margin-bottom:1rem;}
.field-row{display:grid;gap:.85rem;margin-bottom:0;}
.field-row.two-col{grid-template-columns:1fr 1fr;}
.field-row.three-col{grid-template-columns:1fr 1fr 1fr;}
@media (max-width:480px){.field-row.two-col,.field-row.three-col{grid-template-columns:1fr;}}
.field-row .field{margin-bottom:1rem;}

label{display:block;font-size:.8rem;font-weight:600;color:var(--slate);margin-bottom:.35rem;}
input[type=text],input[type=number],input[type=date],input[type=file],select,textarea{
  width:100%;padding:.6rem .75rem;border:1px solid #dfe1e6;border-radius:8px;
  font-family:var(--font-body);font-size:.9rem;color:var(--ink);background:var(--white);
}
textarea{resize:vertical;}
input:focus,select:focus,textarea:focus{border-color:var(--green);}

.items-list{display:flex;flex-direction:column;gap:.6rem;margin-bottom:.7rem;}
.item-row{display:grid;grid-template-columns:1fr 60px 90px 28px;gap:.5rem;align-items:center;}
@media (max-width:480px){.item-row{grid-template-columns:1fr 1fr;grid-template-areas:"desc desc" "qty price" "remove remove";}}
.item-row input{padding:.5rem .6rem;font-size:.85rem;}
.item-remove{background:none;border:none;color:var(--stamp);font-size:1.1rem;cursor:pointer;line-height:1;padding:.3rem;}

.btn-primary,.btn-secondary{font-family:var(--font-body);font-weight:600;font-size:.9rem;border-radius:9px;padding:.75rem 1.2rem;cursor:pointer;border:1px solid transparent;}
.btn-primary{background:var(--green);color:#fff;}
.btn-primary:hover{background:#186049;}
.btn-secondary{background:var(--white);color:var(--ink);border-color:#dfe1e6;}
.btn-secondary:hover{border-color:var(--ink);}

/* ---------- Live preview (paper look) ---------- */
.tool-preview{display:flex;flex-direction:column;gap:1rem;position:sticky;top:88px;}
.preview-sheet{
  position:relative;
  background:var(--white);
  border-radius:6px;
  padding:2rem 1.75rem;
  box-shadow:0 1px 2px rgba(22,35,61,.06),0 12px 30px -12px rgba(22,35,61,.25);
  font-family:var(--font-body);
  overflow:hidden;
}
.preview-sheet::before{content:"";position:absolute;inset:0 0 auto 0;height:6px;background:linear-gradient(90deg,var(--green),var(--ink));}
.preview-top{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;padding-top:.5rem;border-bottom:1px solid var(--paper-line);padding-bottom:1rem;margin-bottom:1rem;flex-wrap:wrap;}
.preview-logo{width:48px;height:48px;object-fit:contain;margin-bottom:.5rem;}
.preview-biz{display:flex;flex-direction:column;font-size:.82rem;color:var(--slate);max-width:220px;}
.preview-biz strong{font-family:var(--font-display);font-size:1.05rem;color:var(--ink);margin-bottom:.15rem;}
.preview-invoice-meta{text-align:right;font-family:var(--font-mono);font-size:.82rem;color:var(--slate);display:flex;flex-direction:column;gap:.15rem;}
.preview-h{font-family:var(--font-display);font-weight:600;font-size:1.4rem;color:var(--ink);letter-spacing:.03em;}

.preview-bill-to{display:flex;flex-direction:column;font-size:.85rem;color:var(--slate);margin-bottom:1.1rem;}
.preview-label{font-family:var(--font-mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.05em;color:var(--green);margin-bottom:.2rem;}
.preview-bill-to strong{color:var(--ink);font-size:.95rem;}

.preview-table{width:100%;border-collapse:collapse;font-size:.85rem;margin-bottom:1rem;}
.preview-table th{text-align:left;font-size:.72rem;text-transform:uppercase;letter-spacing:.04em;color:var(--slate);border-bottom:1px solid var(--paper-line);padding:.4rem .3rem;}
.preview-table td{padding:.5rem .3rem;border-bottom:1px solid #f1f1ec;font-family:var(--font-mono);font-size:.83rem;}
.preview-table td:first-child{font-family:var(--font-body);}
.preview-table th:nth-child(2),.preview-table td:nth-child(2),
.preview-table th:nth-child(3),.preview-table td:nth-child(3),
.preview-table th:nth-child(4),.preview-table td:nth-child(4){text-align:right;}

.preview-totals{margin-left:auto;max-width:240px;font-family:var(--font-mono);font-size:.87rem;}
.preview-totals div{display:flex;justify-content:space-between;padding:.25rem 0;color:var(--slate);}
.preview-totals .grand-total{border-top:1px solid var(--ink);margin-top:.3rem;padding-top:.5rem;color:var(--ink);font-weight:600;font-size:1rem;}
.preview-notes{font-size:.78rem;color:var(--slate);margin-top:1.25rem;border-top:1px dashed var(--paper-line);padding-top:.75rem;}

.preview-stamp{
  position:absolute;top:1.4rem;right:1.6rem;
  font-family:var(--font-mono);font-weight:700;font-size:.85rem;letter-spacing:.08em;
  color:var(--stamp);border:2.5px solid var(--stamp);border-radius:6px;
  padding:.25rem .6rem;transform:rotate(-9deg) scale(0);
  opacity:0;transition:transform .45s cubic-bezier(.34,1.56,.64,1), opacity .3s;
  pointer-events:none;
}
.preview-stamp.show{transform:rotate(-9deg) scale(1);opacity:.85;}
@media (prefers-reduced-motion:reduce){.preview-stamp{transition:none;}}

.preview-actions{display:flex;gap:.75rem;}
.preview-actions .btn-primary{flex:1;}

/* ---------- Sections ---------- */
.section{padding:3.5rem 1.5rem;}
.section h2{font-size:clamp(1.5rem,3vw,2rem);margin-bottom:1.75rem;text-align:center;}
.alt-bg{background:var(--white);border-top:1px solid var(--paper-line);border-bottom:1px solid var(--paper-line);}

.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.75rem;}
@media (max-width:820px){.steps-grid{grid-template-columns:1fr;}}
.step-num{display:block;font-family:var(--font-mono);color:var(--green);font-size:.85rem;margin-bottom:.5rem;}
.step h3{font-size:1.1rem;}
.step p{color:var(--slate);font-size:.92rem;}

.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;}
@media (max-width:820px){.features-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:560px){.features-grid{grid-template-columns:1fr;}}
.feature{background:var(--canvas);border:1px solid var(--paper-line);border-radius:12px;padding:1.4rem;}
.feature h3{font-size:1rem;margin-bottom:.4rem;}
.feature p{color:var(--slate);font-size:.88rem;margin:0;}

.faq-list{max-width:720px;margin:0 auto;display:flex;flex-direction:column;gap:.7rem;}
.faq-list details{background:var(--white);border:1px solid var(--paper-line);border-radius:10px;padding:.9rem 1.1rem;}
.faq-list summary{cursor:pointer;font-weight:600;font-size:.95rem;}
.faq-list p{color:var(--slate);margin:.6rem 0 0;font-size:.9rem;}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:#c9cfda;padding:2.5rem 1.5rem;}
.site-footer p{font-size:.85rem;max-width:70ch;margin:0 0 .75rem;}
.footer-meta{color:#8a92a6;font-size:.78rem;}