:root{
  --paper:#F6F3EC; --ink:#1F2A24; --ink-soft:#5B665E; --rule:#D8D2C2;
  --brass:#9C6B33; --moss:#3F5E48; --moss-deep:#27392E; --card:#FFFFFF;
  --font-display:'Spectral',Georgia,serif;
  --font-mono:'JetBrains Mono','Courier New',monospace;
  --font-body:'Inter',-apple-system,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0;}
body{background:var(--paper);color:var(--ink);font-family:var(--font-body);min-height:100vh;}

/* ── Top Nav ── */
.topnav{
  background:var(--moss-deep); color:var(--paper);
  display:flex; align-items:center; justify-content:space-between;
  padding:12px 24px; position:sticky; top:0; z-index:100;
}
.topnav a{color:var(--paper);text-decoration:none;font-family:var(--font-mono);font-size:13px;opacity:.8;}
.topnav a:hover{opacity:1;}
.topnav-brand{font-family:var(--font-display);font-size:20px;font-weight:600;color:var(--paper);}
.topnav-brand em{color:#C9A35E;font-style:italic;}

/* ── Currency picker in nav ── */
.nav-currency{display:flex;align-items:center;gap:8px;}
.nav-currency label{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:rgba(246,243,236,.6);white-space:nowrap;}
.nav-currency select{background:rgba(255,255,255,.1);border:1px solid rgba(246,243,236,.25);color:var(--paper);font-family:var(--font-mono);font-size:12px;padding:4px 6px;border-radius:3px;}
.nav-currency select:focus{outline:none;}

/* ── Hero ── */
.hero{max-width:1040px;margin:0 auto;padding:40px 24px 24px;}
.eyebrow{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--brass);margin-bottom:10px;}
h1{font-family:var(--font-display);font-weight:600;font-size:clamp(28px,4vw,44px);line-height:1.1;letter-spacing:-.01em;}
h1 em{color:var(--moss);font-style:italic;}
.lede{margin-top:12px;max-width:560px;color:var(--ink-soft);font-size:15px;line-height:1.6;}
.rate-note{margin-top:8px;font-size:11.5px;color:var(--ink-soft);font-style:italic;}

/* ── Single calc panel ── */
.calc-wrap{max-width:1040px;margin:0 auto;padding:0 24px 60px;}
.calc-panel{
  background:var(--card);border:1px solid var(--rule);
  border-top:4px solid var(--moss-deep);padding:36px;
  display:grid;grid-template-columns:1.1fr 1fr;gap:40px;
}
@media(max-width:720px){.calc-panel{grid-template-columns:1fr;padding:24px;}}
.calc-panel h2{font-family:var(--font-display);font-size:24px;margin-bottom:6px;}
.calc-panel .sub{color:var(--ink-soft);font-size:13.5px;margin-bottom:22px;}
label{display:block;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-soft);margin-bottom:6px;margin-top:18px;}
label:first-of-type{margin-top:0;}
input[type=number],input[type=text],select{
  width:100%;padding:11px 12px;border:1px solid var(--rule);
  background:var(--paper);font-family:var(--font-mono);font-size:15px;
  color:var(--ink);border-radius:2px;
}
input:focus,select:focus{outline:2px solid var(--moss);outline-offset:1px;}

/* ── Result box ── */
.result-box{background:var(--moss-deep);color:var(--paper);padding:28px 26px;border-radius:4px;align-self:start;}
.result-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#C9A35E;margin-bottom:8px;}
.result-big{font-family:var(--font-display);font-size:34px;font-weight:600;line-height:1.1;margin-bottom:18px;word-break:break-word;}
.result-rows{font-size:13.5px;line-height:2;border-top:1px solid rgba(246,243,236,.18);padding-top:14px;}
.result-rows .row{display:flex;justify-content:space-between;gap:12px;}
.result-rows .row span:last-child{font-family:var(--font-mono);color:#E8E2D2;text-align:right;}

/* ── Share buttons ── */
.share-row{margin-top:20px;padding-top:16px;border-top:1px solid rgba(246,243,236,.18);}
.share-label{font-family:var(--font-mono);font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:#C9A35E;display:block;margin-bottom:8px;}
.share-btns{display:flex;gap:6px;flex-wrap:wrap;}
.share-btn{
  font-family:var(--font-mono);font-size:11px;font-weight:600;
  letter-spacing:.04em;padding:7px 11px;border:none;border-radius:3px;
  cursor:pointer;transition:opacity .15s;white-space:nowrap;
}
.share-btn:hover{opacity:.85;}
.share-btn.wa{background:#25D366;color:#fff;}
.share-btn.tw{background:#000;color:#fff;}
.share-btn.fb{background:#1877F2;color:#fff;}
.share-btn.cp{background:rgba(246,243,236,.15);color:var(--paper);border:1px solid rgba(246,243,236,.3);}

/* ── More Calculators grid ── */
.more-section{max-width:1040px;margin:0 auto;padding:40px 24px 60px;}
.more-section h3{font-family:var(--font-display);font-size:22px;margin-bottom:20px;}
.calc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;}
.calc-card{
  background:var(--card);border:1px solid var(--rule);padding:16px;
  border-radius:3px;text-decoration:none;color:var(--ink);
  transition:border-color .15s,transform .15s;display:block;
}
.calc-card:hover{border-color:var(--moss);transform:translateY(-2px);}
.calc-card.active-card{border-color:var(--moss-deep);border-top:3px solid var(--moss-deep);}
.calc-card .card-emoji{font-size:22px;margin-bottom:8px;display:block;}
.calc-card .card-name{font-family:var(--font-mono);font-size:12px;font-weight:600;color:var(--ink);}
.calc-card .card-desc{font-size:12px;color:var(--ink-soft);margin-top:4px;line-height:1.4;}

/* ── Homepage hero ── */
.home-hero{max-width:1040px;margin:0 auto;padding:56px 24px 40px;border-bottom:1px solid var(--rule);}
.home-hero h1{font-size:clamp(36px,6vw,58px);}
.home-grid-section{max-width:1040px;margin:0 auto;padding:40px 24px 80px;}
.home-grid-section h2{font-family:var(--font-display);font-size:26px;margin-bottom:24px;}
.home-calc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px;}
.home-calc-card{
  background:var(--card);border:1px solid var(--rule);padding:20px 18px;
  border-radius:3px;text-decoration:none;color:var(--ink);
  transition:border-color .15s,box-shadow .15s;display:block;
}
.home-calc-card:hover{border-color:var(--moss);box-shadow:0 4px 16px rgba(39,57,46,.1);}
.home-calc-card .card-emoji{font-size:28px;margin-bottom:10px;display:block;}
.home-calc-card .card-name{font-family:var(--font-display);font-size:15px;font-weight:600;margin-bottom:6px;}
.home-calc-card .card-desc{font-size:13px;color:var(--ink-soft);line-height:1.5;}

/* ── Footer ── */
footer{text-align:center;padding:24px;font-family:var(--font-mono);font-size:11.5px;color:var(--ink-soft);border-top:1px solid var(--rule);}

/* ── PWA Banner ── */
#pwa-banner{
  position:fixed;bottom:0;left:0;right:0;
  background:var(--moss-deep);color:var(--paper);
  padding:14px 20px;z-index:9999;
  align-items:center;justify-content:space-between;gap:12px;
  box-shadow:0 -4px 20px rgba(0,0,0,.25);display:none;
  animation:slideUp .3s ease;
}
@keyframes slideUp{from{transform:translateY(100%)}to{transform:translateY(0)}}
.pwa-left{display:flex;align-items:center;gap:12px;}
.pwa-icon{width:44px;height:44px;border-radius:10px;background:var(--brass);display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0;}
.pwa-text strong{display:block;font-size:14px;margin-bottom:2px;}
.pwa-text span{font-size:12px;opacity:.75;}
.pwa-actions{display:flex;gap:8px;flex-shrink:0;}
#pwa-install-btn{background:var(--brass);color:#fff;border:none;padding:9px 18px;border-radius:4px;font-family:var(--font-mono);font-size:12px;font-weight:600;cursor:pointer;}
#pwa-dismiss-btn{background:transparent;color:var(--paper);border:1px solid rgba(246,243,236,.3);padding:9px 14px;border-radius:4px;font-family:var(--font-mono);font-size:12px;cursor:pointer;opacity:.75;}
@media(max-width:600px){
  #pwa-banner{flex-direction:column;align-items:flex-start;}
  .pwa-actions{width:100%;}
  #pwa-install-btn,#pwa-dismiss-btn{flex:1;}
}