:root{
  --paper:#eef1e7;
  --paper-panel:#f8f9f6;
  --rule:rgba(47,111,78,0.16);
  --ink:#1e2b22;
  --ledger:#2f6f4e;
  --ledger-bright:#3f8c63;
  --stamp:#a13d2b;
  --stamp-bright:#bb4c37;
  --muted:#5b6d5f;
  --line:rgba(30,43,34,0.12);
  --font-display:'Spectral', serif;
  --font-body:'Public Sans', sans-serif;
  --font-mono:'Space Mono', monospace;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  background-image:repeating-linear-gradient(
    to bottom,
    transparent 0px, transparent 34px,
    var(--rule) 34px, var(--rule) 35px
  );
}
a{color:var(--ledger);}
h1,h2,h3{font-family:var(--font-display); font-weight:600; margin:0 0 .4em; color:var(--ink);}
p{color:var(--muted);}
::selection{background:var(--ledger); color:var(--paper);}
:focus-visible{outline:2px solid var(--ledger); outline-offset:2px;}

.wrap{max-width:1080px; margin:0 auto; padding:0 24px; position:relative; z-index:1;}

header.site{
  position:sticky; top:0; z-index:40;
  background:rgba(238,241,231,0.94);
  backdrop-filter:blur(6px);
  border-bottom:2px solid var(--ink);
}
.site-bar{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 24px; max-width:1080px; margin:0 auto; gap:16px; flex-wrap:wrap;
}
.logo{display:flex; align-items:center; gap:10px; text-decoration:none;}
.logo-mark{
  width:34px; height:34px; border:2px solid var(--ink); border-radius:4px;
  display:flex; align-items:center; justify-content:center;
  font-family:var(--font-mono); font-weight:700; font-size:.85rem; color:var(--stamp);
  transform:rotate(-4deg); flex-shrink:0;
}
.logo-word{font-family:var(--font-display); font-weight:700; font-size:1.2rem; color:var(--ink);}
.logo-word span{color:var(--ledger);}

nav.tabs{display:flex; gap:4px; flex-wrap:wrap;}
nav.tabs a{
  background:transparent; border:1px solid transparent; color:var(--muted);
  font-family:var(--font-body); font-weight:600; font-size:.85rem; text-decoration:none;
  padding:8px 14px; border-radius:5px; cursor:pointer; transition:all .15s ease;
  display:inline-block;
}
nav.tabs a:hover{color:var(--ink); background:rgba(30,43,34,0.06);}
nav.tabs a.active{background:var(--ledger); color:var(--paper);}

.menu-toggle{
  display:none; flex-direction:column; align-items:center; justify-content:center;
  gap:5px; width:40px; height:36px; background:transparent;
  border:1px solid var(--line); border-radius:6px; cursor:pointer; padding:0; flex-shrink:0;
}
.menu-toggle span{display:block; height:2px; width:18px; background:var(--ink); border-radius:2px; transition:transform .15s ease, opacity .15s ease;}
.menu-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.menu-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.menu-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ---------- Hero / calculator ---------- */
.hero{padding:52px 0 30px; text-align:center;}
.hero .kicker{
  font-family:var(--font-mono); font-size:1.05rem; letter-spacing:.1em; text-transform:uppercase;
  color:var(--ledger); margin-bottom:12px; display:block; font-weight:700;
}
.hero h1{font-size:clamp(1.7rem, 4vw, 2.5rem); margin-bottom:.3em;}
.hero p.lede{max-width:560px; margin:0 auto 8px; font-size:1.02rem;}

.calc-card{
  background:var(--paper-panel); border:2px solid var(--ink); border-radius:10px;
  padding:28px; max-width:560px; margin:28px auto 0; text-align:left;
  box-shadow:6px 6px 0 rgba(30,43,34,0.08);
}
.calc-row{display:flex; gap:12px; flex-wrap:wrap; margin-bottom:16px;}
.calc-row > div{flex:1; min-width:150px;}
.calc-toggle{display:flex; gap:8px; margin-bottom:16px;}
.calc-toggle button{
  flex:1; background:#FFCE1B; border:2px solid var(--ink); color:var(--ink);
  font-family:var(--font-body); font-weight:700; font-size:.9rem; padding:11px; border-radius:6px; cursor:pointer;
}
.calc-toggle button.active{background:var(--ledger); border-color:var(--ledger); color:var(--paper);}

label.field-label{
  display:block; font-size:.76rem; font-weight:700; text-transform:uppercase;
  letter-spacing:.05em; color:var(--ledger); margin-bottom:6px;
}
input.field-input, select.field-input{
  width:100%; border:2px solid var(--ink); border-radius:6px;
  background:var(--paper); color:var(--ink);
  font-family:var(--font-mono); font-size:1.05rem; padding:11px 13px;
}
input.field-input:focus, select.field-input:focus{outline:2px solid var(--ledger); outline-offset:2px;}

/* Receipt-style result */
.receipt{
  margin-top:20px; background:var(--paper); border:1px dashed var(--ink); border-radius:4px;
  padding:18px 20px; font-family:var(--font-mono);
}
.receipt-row{display:flex; justify-content:space-between; padding:6px 0; font-size:.95rem;}
.receipt-row.total{border-top:1px dashed var(--ink); margin-top:6px; padding-top:12px; font-weight:700; font-size:1.15rem; color:var(--ledger);}
.receipt-label{color:var(--muted);}

/* ---------- Layout / cards ---------- */
main{padding-bottom:80px;}
section.tool{padding-top:36px;}
.tool-head{margin-bottom:22px;}
.tool-head h1{font-size:1.6rem;}
.tool-head p{max-width:640px;}
.tool-head p.explainer{font-size:1rem;}

.card{
  background:var(--paper-panel); border:1px solid var(--line); border-radius:10px; padding:24px; margin-bottom:20px;
}

button.btn{
  background:var(--ledger); color:var(--paper); border:none; border-radius:6px;
  font-family:var(--font-body); font-weight:700; font-size:.92rem; padding:12px 22px;
  cursor:pointer; transition:background .15s ease;
}
button.btn:hover{background:var(--ledger-bright);}
button.btn.secondary{background:transparent; border:2px solid var(--ink); color:var(--ink);}
button.btn.secondary:hover{background:rgba(30,43,34,0.06);}
a.btn{text-decoration:none; display:inline-block;}

/* ---------- Nominal code stamp (signature element) ---------- */
.nc-stamp{
  display:inline-flex; align-items:center; justify-content:center;
  font-family:var(--font-mono); font-weight:700; font-size:.95rem;
  border:2px solid var(--stamp); color:var(--stamp); border-radius:6px;
  padding:6px 12px; transform:rotate(-2deg); background:rgba(161,61,43,0.04);
  letter-spacing:.02em;
}
.nc-stamp.big{font-size:1.8rem; padding:10px 20px; border-width:3px;}

.nc-search{margin-bottom:20px;}
.nc-table-wrap{width:100%; overflow-x:auto; -webkit-overflow-scrolling:touch;}
.nc-table{width:100%; border-collapse:collapse;}
.nc-table th{text-align:left; font-family:var(--font-mono); font-size:.7rem; text-transform:uppercase; letter-spacing:.06em; color:var(--ledger); padding:8px 10px; border-bottom:2px solid var(--ink);}
.nc-table td{padding:10px; border-bottom:1px solid var(--line); font-size:.9rem; vertical-align:top;}
.nc-table tr:hover td{background:rgba(47,111,78,0.05);}
.nc-table a{text-decoration:none; color:var(--ink); font-weight:600;}
.nc-table a:hover{color:var(--ledger);}
.nc-cat{font-size:.72rem; color:var(--muted); text-transform:uppercase; letter-spacing:.04em;}

.balance-pill{
  display:inline-block; font-family:var(--font-mono); font-size:.72rem; font-weight:700;
  padding:3px 9px; border-radius:12px; text-transform:uppercase; letter-spacing:.04em;
}
.balance-pill.debit{background:rgba(47,111,78,0.14); color:var(--ledger);}
.balance-pill.credit{background:rgba(161,61,43,0.12); color:var(--stamp);}

.nc-detail-head{display:flex; align-items:center; gap:16px; flex-wrap:wrap; margin-bottom:8px;}

.breadcrumb{font-size:.82rem; margin-bottom:14px;}
.breadcrumb a{color:var(--muted); text-decoration:none;}
.breadcrumb a:hover{color:var(--ledger);}

/* blog */
.blog-card{
  background:var(--paper-panel); border:1px solid var(--line); border-radius:10px; padding:20px; margin-bottom:16px;
  display:block; text-decoration:none; color:var(--ink); transition:border-color .15s ease;
}
.blog-card:hover{border-color:var(--ledger);}
.blog-card .blog-date{font-family:var(--font-mono); font-size:.72rem; color:var(--ledger); text-transform:uppercase; letter-spacing:.05em;}
.blog-card h3{font-size:1.1rem; margin:6px 0;}
.blog-card p{margin:0; font-size:.88rem;}

.tool-grid{display:grid; grid-template-columns:repeat(auto-fit, minmax(230px,1fr)); gap:18px; margin-top:10px;}
.tool-card{
  background:var(--paper-panel); border:1px solid var(--line); border-radius:10px; padding:22px; text-decoration:none;
  color:var(--ink); display:block; transition:transform .15s ease, border-color .15s ease;
}
.tool-card:hover{transform:translateY(-3px); border-color:var(--ledger);}
.tool-card .tc-icon{
  font-family:var(--font-mono); font-weight:700; font-size:1rem; color:var(--paper);
  background:var(--ledger); width:36px; height:36px; border-radius:6px; display:flex;
  align-items:center; justify-content:center; margin-bottom:14px;
}
.tool-card h3{font-size:1.05rem; margin-bottom:6px;}
.tool-card p{font-size:.85rem; margin:0;}

.status-line{font-size:.9rem; color:var(--muted); padding:10px 0;}
.status-line.good{color:var(--ledger);}
.status-line.bad{color:var(--stamp);}

.ad-slot{max-width:728px; margin:0 auto 36px; display:flex; align-items:center; justify-content:center; overflow:hidden;}
.ad-slot--leaderboard{width:100%; min-height:90px;}
.ad-slot--rectangle{width:100%; max-width:336px; min-height:280px;}
.ad-slot.placeholder{
  border:1px dashed var(--line); border-radius:8px; background:rgba(30,43,34,0.03);
  color:var(--muted); font-size:.7rem; letter-spacing:.06em; text-transform:uppercase;
  font-family:var(--font-body); text-align:center; padding:8px;
}

footer{border-top:2px solid var(--ink); padding:30px 0; text-align:center; font-size:.8rem; color:var(--muted); background:rgba(238,241,231,0.94);}
footer a{color:var(--muted); text-decoration:underline;}
footer .foot-links{margin-bottom:10px;}
footer .foot-links a{margin:0 8px; color:var(--ledger); text-decoration:none; font-weight:600;}

.sr-only{position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0);}

@media (max-width:640px){
  .site-bar{flex-wrap:wrap; align-items:center;}
  .logo{order:1;}
  .menu-toggle{order:2; display:flex; margin-left:auto;}
  nav.tabs{
    order:3; display:none; width:100%; flex-direction:column; gap:2px;
    background:var(--paper-panel); border:1px solid var(--line); border-radius:8px; padding:8px; margin-top:4px;
  }
  nav.tabs.open{display:flex;}
  nav.tabs a{text-align:center; padding:11px;}
  .nc-table th:nth-child(3), .nc-table td:nth-child(3),
  .nc-table th:nth-child(4), .nc-table td:nth-child(4){
    display:none;
  }
}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:0.001ms !important; transition-duration:0.001ms !important;}
}