/* Tank and Tail - stylesheet.
   Clean, modern, aquatic. Airy layout and rounded cards in the spirit of
   Omni Calculator, with a clear colored result panel in the spirit of
   calculator.net. Water themed teal-blue palette, system font stack.
   Mobile first, works at 360px. No gradients, no animations, no heavy shadows. */

:root{
  --bg:#f4f8fb;          /* app background, light aquatic */
  --surface:#ffffff;
  --ink:#0f2635;         /* deep navy ink */
  --muted:#5a6b78;
  --line:#e1e8ee;
  --brand:#0f7ea3;       /* aquatic teal-blue */
  --brand-dark:#0b5f7c;
  --brand-bg:#e6f3f8;    /* light brand tint */
  --max:980px;
}

*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:var(--bg);
  font-size:16px;
  line-height:1.6;
}
@media (min-width:640px){ body{ font-size:17px; } }

.wrap{width:100%;max-width:var(--max);margin:0 auto;padding:0 16px;}

a{color:var(--brand-dark);text-decoration:none;}
a:hover{text-decoration:underline;}

h1{font-size:32px;font-weight:700;line-height:1.18;margin:.25em 0 .35em;letter-spacing:-.01em;}
h2{font-size:23px;font-weight:700;line-height:1.25;margin:1.5em 0 .5em;letter-spacing:-.01em;}
h3{font-size:18px;font-weight:600;line-height:1.3;margin:1.1em 0 .4em;}
p{margin:0 0 1em;}
ul,ol{margin:0 0 1em;padding-left:1.25em;}
li{margin-bottom:.3em;}

/* Header - sticky white bar with a fish logo mark */
.site-header{
  position:sticky;top:0;z-index:20;
  background:var(--surface);border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:10px 20px;flex-wrap:wrap;padding:12px 16px;
}
.logo{
  display:inline-flex;align-items:center;gap:9px;
  font-size:21px;font-weight:800;color:var(--brand);letter-spacing:-.02em;
}
.logo:hover{text-decoration:none;}
.logo-mark{color:var(--brand);flex:none;}
.logo-mark .eye{fill:#fff;}
.site-nav{display:flex;gap:4px;flex-wrap:wrap;}
.site-nav a{
  color:var(--ink);font-size:15px;font-weight:600;padding:7px 13px;border-radius:8px;
}
.site-nav a:hover{background:var(--brand-bg);color:var(--brand-dark);text-decoration:none;}
.site-nav a.active{background:var(--brand-bg);color:var(--brand-dark);}

main.wrap{padding-top:20px;padding-bottom:8px;}

/* Breadcrumb */
.breadcrumb{font-size:13px;color:var(--muted);margin:0 0 12px;}
.breadcrumb a{color:var(--brand-dark);}

/* Intro lead */
.lead{font-size:18px;color:#3a4a56;}
.hero{padding:6px 0 2px;}
.hero .lead{max-width:680px;}

/* Calculator tool box - white rounded card */
.tool{
  border:1px solid var(--line);border-radius:14px;background:var(--surface);
  padding:22px;margin:16px 0 28px;
}
.tool h3{margin-top:0;}
.tool .grid{
  display:grid;gap:16px;
  grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
}
.field{min-width:0;}
.field label{display:block;font-size:13px;font-weight:600;color:#42505c;margin-bottom:5px;}
.field input,.field select{
  width:100%;padding:11px 12px;border:1px solid #cdd8e1;border-radius:9px;
  font-size:16px;background:#fff;color:var(--ink);
}
.field input:focus,.field select:focus{
  outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-bg);
}

.tool .actions{margin-top:18px;display:flex;gap:10px;flex-wrap:wrap;}
.tool button{
  background:var(--brand);color:#fff;border:1px solid var(--brand);
  padding:12px 28px;border-radius:9px;font-size:16px;font-weight:600;cursor:pointer;
}
.tool button:hover{background:var(--brand-dark);border-color:var(--brand-dark);}
.tool button.secondary{background:#fff;color:var(--brand-dark);border:1px solid #cdd8e1;}
.tool button.secondary:hover{background:var(--brand-bg);}

.fish-row{display:grid;grid-template-columns:2fr 1fr auto;gap:10px;align-items:end;margin-bottom:10px;}
.fish-row button{background:#fff;color:var(--muted);border:1px solid #cdd8e1;padding:10px 12px;font-weight:500;font-size:14px;}

/* Result panel - brand heading bar with the big number */
.result{
  display:none;margin-top:20px;border:1px solid #cfe3ec;border-radius:12px;
  background:#fff;padding:16px 18px;font-size:16px;overflow:hidden;
}
.result.show{display:block;}
.result .big{
  display:block;background:var(--brand);color:#fff;
  font-size:26px;font-weight:700;line-height:1.2;
  padding:14px 18px;margin:-16px -18px 14px;
}
.result .sub{display:block;color:var(--muted);font-size:14px;margin:3px 0;}
.result .note{margin-top:12px;font-size:14px;color:#334;background:var(--brand-bg);border-radius:8px;padding:10px 12px;}
.result ul{margin:.4em 0 0;}

/* Cards */
.cards{
  display:grid;gap:14px;margin:14px 0 8px;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
}
.card{
  display:block;border:1px solid var(--line);border-radius:12px;padding:18px;
  color:var(--ink);background:var(--surface);
}
.card:hover{border-color:var(--brand);background:#fbfdfe;text-decoration:none;}
.card h3{margin:0 0 5px;font-size:17px;color:var(--brand-dark);}
.card p{margin:0;color:var(--muted);font-size:14px;}

/* FAQ */
.faq details{border:1px solid var(--line);border-radius:10px;background:var(--surface);padding:12px 16px;margin-bottom:10px;}
.faq summary{cursor:pointer;font-weight:600;font-size:16px;color:var(--ink);list-style:none;}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::before{content:"+";display:inline-block;width:1.1em;color:var(--brand);font-weight:700;}
.faq details[open] summary::before{content:"\2013";}
.faq p{margin:10px 0 0;color:#41505b;}

/* Content sections */
.section{max-width:720px;}

/* Footer - dark brand panel */
.site-footer{
  margin-top:44px;padding:36px 0 24px;
  background:var(--ink);color:#c3d0d9;border-top:3px solid var(--brand);
}
.footer-grid{display:grid;gap:26px;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));}
.footer-brand{max-width:36ch;}
.site-footer .footer-logo{
  display:inline-flex;align-items:center;gap:9px;
  font-size:20px;font-weight:800;letter-spacing:-.02em;color:#fff;margin-bottom:10px;
}
.site-footer .footer-logo:hover{text-decoration:none;color:#fff;}
.footer-brand p{margin:0;color:#94a7b2;font-size:14px;line-height:1.6;}
.site-footer h2{
  font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:#8298a5;
  font-weight:700;margin:0 0 12px;
}
.site-footer ul{list-style:none;margin:0;padding:0;}
.site-footer li{margin-bottom:8px;}
.site-footer a{color:#dbe6ec;font-size:14px;}
.site-footer a:hover{color:#fff;}
.footer-base{
  margin-top:26px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);
  color:#8298a5;font-size:13px;
}
.footer-base p{margin:0;}

/* H1: Title Case - capitalize the first letter of each word */
h1{text-transform:capitalize;}

/* Home page: centered hero and tool grid; article content stays left aligned */
.home .hero-banner{grid-template-columns:1fr;text-align:center;}
.home .hero-cta{justify-content:center;}
.home .hero-art svg{margin:16px auto 0;}
.home main.wrap > h2{text-align:center;}
.home .cards .card{text-align:center;}
.home .section{text-align:left;}
.home .faq{max-width:760px;text-align:left;}

/* Ad slots - reserved space for AdSense units */
.ad-slot{max-width:970px;margin:26px auto;text-align:center;}
.ad-label{
  display:block;font-size:11px;letter-spacing:.08em;text-transform:uppercase;
  color:#9aa7b1;margin-bottom:6px;
}
.ad-box{
  display:flex;align-items:center;justify-content:center;min-height:90px;
  border:1px dashed #d2dae1;border-radius:10px;background:#fbfcfd;
  color:#9aa7b1;font-size:13px;
}
.ad-slot.rectangle{max-width:340px;}
.ad-slot.rectangle .ad-box{min-height:250px;}

/* Link styled as a button (hero calls to action) */
.btn{
  display:inline-block;background:var(--brand);color:#fff;border:1px solid var(--brand);
  padding:12px 22px;border-radius:9px;font-weight:600;font-size:16px;
}
.btn:hover{background:var(--brand-dark);border-color:var(--brand-dark);text-decoration:none;}
.btn.secondary{background:#fff;color:var(--brand-dark);border:1px solid #cdd8e1;}
.btn.secondary:hover{background:#fff;border-color:var(--brand);text-decoration:none;}

/* Hero banner with illustration */
.hero-banner{
  display:grid;grid-template-columns:1fr;gap:22px;align-items:center;
  background:var(--brand-bg);border:1px solid #cfe6ef;border-radius:16px;
  padding:24px;margin:6px 0 28px;
}
@media (min-width:760px){ .hero-banner{grid-template-columns:1.05fr .95fr;padding:34px;} }
.hero-banner h1{margin-top:0;}
.hero-banner .lead{color:#2f4653;}
.hero-cta{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px;}
.hero-art svg{display:block;width:100%;height:auto;max-width:440px;margin:0 auto;}

/* Three column card grid (six tools as 3 x 2 on desktop) */
.cards-3{grid-template-columns:1fr;}
@media (min-width:480px){ .cards-3{grid-template-columns:repeat(2,1fr);} }
@media (min-width:760px){ .cards-3{grid-template-columns:repeat(3,1fr);} }

/* Icon on a calculator card */
.card-icon{
  display:inline-flex;align-items:center;justify-content:center;
  width:44px;height:44px;border-radius:10px;background:var(--brand-bg);
  color:var(--brand);margin-bottom:10px;
}
.card-icon svg{width:26px;height:26px;}