/* ===== Design tokens ===== */
:root{
  --bg: #F8F6FC;
  --surface: #FFFFFF;
  --ink: #241B3A;
  --ink-soft: #6E5E8C;
  --line: #E9E1F7;
  --accent: #7C3AED;      /* finance / trust */
  --accent-2: #EC4899;    /* health / positive */
  --accent-3: #C026D3;    /* math */
  --warn: #D6336C;
  --readout-bg: #1E1033;
  --readout-fg: #F0ABFC;
  --radius: 14px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background: linear-gradient(160deg, #F9F5FE 0%, #FBF1FA 45%, #FDF0F6 100%);
  background-attachment: fixed;
  color:var(--ink);
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3{
  font-family:'Space Grotesk',system-ui,sans-serif;
  letter-spacing:-0.01em;
  margin:0 0 .5em;
  color:var(--ink);
}
a{color:var(--accent);}
p{color:var(--ink-soft);}

.container{max-width:1080px;margin:0 auto;padding:0 24px;}

/* ===== Header ===== */
.site-header{
  border-bottom:1px solid var(--line);
  background:var(--surface);
  position:sticky;top:0;z-index:50;
}
.nav{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 0;
}
.brand{
  display:flex;align-items:center;gap:10px;
  font-family:'Space Grotesk',sans-serif;
  font-weight:700;font-size:1.15rem;color:var(--ink);
  text-decoration:none;
}
.brand .logo-icon{display:block;flex-shrink:0;}
.brand .dot{
  width:10px;height:10px;border-radius:3px;
  background:linear-gradient(135deg,var(--accent),var(--accent-2) 50%,var(--accent-3));
  display:inline-block;
}
.nav-links{display:flex;gap:28px;list-style:none;margin:0;padding:0;}
.nav-links a{
  color:var(--ink-soft);text-decoration:none;font-size:.95rem;font-weight:500;
  padding:6px 2px;border-bottom:2px solid transparent;
}
.nav-links a:hover, .nav-links a.active{color:var(--ink);border-bottom-color:var(--accent);}
.nav-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--ink);}

@media(max-width:720px){
  .nav-links{
    display:none;position:absolute;top:64px;left:0;right:0;
    background:var(--surface);flex-direction:column;gap:0;
    border-bottom:1px solid var(--line);padding:8px 24px 16px;
  }
  .nav-links.open{display:flex;}
  .nav-links a{padding:12px 0;border-bottom:1px solid var(--line);}
  .nav-toggle{display:block;}
}

/* ===== Hero ===== */
.hero{padding:64px 0 40px;}
.hero .eyebrow{
  font-family:'IBM Plex Mono',monospace;font-size:.8rem;
  color:var(--accent);letter-spacing:.06em;text-transform:uppercase;
}
.hero h1{font-size:clamp(2rem,5vw,3rem);max-width:820px;}
.hero p.lead{font-size:1.15rem;max-width:640px;}

/* ===== Category grid ===== */
.cat-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:20px;margin:40px 0 64px;
}
.cat-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;text-decoration:none;color:var(--ink);
  transition:transform .15s ease, box-shadow .15s ease, border-color .15s ease;
  display:block;
}
.cat-card:hover{transform:translateY(-3px);box-shadow:0 12px 28px -14px rgba(22,33,62,.25);}
.cat-card .tag{
  font-family:'IBM Plex Mono',monospace;font-size:.72rem;
  letter-spacing:.06em;text-transform:uppercase;padding:3px 8px;
  border-radius:6px;display:inline-block;margin-bottom:14px;
}
.cat-card.finance .tag{background:#F0E6FD;color:var(--accent);}
.cat-card.math .tag{background:#FBE3F9;color:var(--accent-3);}
.cat-card.health .tag{background:#FDE3EF;color:var(--accent-2);}
.cat-card h3{margin-bottom:6px;font-size:1.15rem;}
.cat-card p{margin:0;font-size:.92rem;}

/* ===== Calculator module ===== */
.calc-module{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;margin-bottom:36px;
}
.calc-module h2{font-size:1.3rem;margin-bottom:4px;}
.calc-module .desc{font-size:.92rem;margin-bottom:20px;}
.field-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:18px;}
.field{display:flex;flex-direction:column;gap:6px;}
.field label{font-size:.85rem;font-weight:600;color:var(--ink);}
.field input, .field select{
  border:1px solid var(--line);border-radius:8px;padding:10px 12px;
  font-size:1rem;font-family:'IBM Plex Mono',monospace;color:var(--ink);
  background:#FBFCFE;
}
.field input:focus, .field select:focus{outline:2px solid var(--accent);outline-offset:1px;}

.btn{
  border:none;border-radius:8px;padding:11px 20px;font-weight:600;font-size:.95rem;
  cursor:pointer;font-family:'Inter',sans-serif;
}
.btn-primary{background:var(--ink);color:#fff;}
.btn-primary:hover{background:#0d1730;}

/* Signature: digital readout for every result */
.readout{
  margin-top:20px;background:var(--readout-bg);border-radius:10px;
  padding:20px 22px;color:var(--readout-fg);
  font-family:'IBM Plex Mono',monospace;
}
.readout .r-label{font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;opacity:.65;margin-bottom:6px;}
.readout .r-value{font-size:2rem;font-variant-numeric:tabular-nums;font-weight:600;}
.readout .r-sub{font-size:.82rem;opacity:.75;margin-top:6px;}

/* ===== Site search ===== */
.search-wrap{position:relative;max-width:480px;margin-top:28px;}
.search-wrap input{
  width:100%;padding:14px 16px;border-radius:10px;border:1px solid var(--line);
  font-size:1rem;font-family:'Inter',sans-serif;background:var(--surface);
}
.search-wrap input:focus{outline:2px solid var(--accent);outline-offset:1px;}
.search-results{
  display:none;position:absolute;top:calc(100% + 6px);left:0;right:0;
  background:var(--surface);border:1px solid var(--line);border-radius:10px;
  box-shadow:0 16px 32px -16px rgba(36,27,58,.25);overflow:hidden;z-index:40;
}
.search-result-item{
  display:flex;justify-content:space-between;align-items:center;
  padding:12px 16px;text-decoration:none;color:var(--ink);font-size:.92rem;
  border-bottom:1px solid var(--line);
}
.search-result-item:last-child{border-bottom:none;}
.search-result-item:hover{background:var(--bg);}
.search-result-cat{
  font-family:'IBM Plex Mono',monospace;font-size:.7rem;color:var(--ink-soft);
  text-transform:uppercase;letter-spacing:.05em;
}

/* ===== Ad placeholder slots ===== */
.ad-slot{
  border:1px dashed var(--line);border-radius:10px;
  background:rgba(255,255,255,.5);
  color:var(--ink-soft);font-family:'IBM Plex Mono',monospace;font-size:.75rem;
  letter-spacing:.06em;text-transform:uppercase;text-align:center;
  padding:18px;margin:28px 0;
}
.content-page{padding:56px 0 80px;max-width:760px;}
.content-page h1{margin-bottom:18px;}
.content-page h2{margin-top:36px;font-size:1.2rem;}
.content-page section{margin-bottom:8px;}

/* ===== Footer ===== */
.site-footer{
  border-top:1px solid var(--line);margin-top:60px;padding:36px 0;
  background:var(--surface);
}
.footer-inner{display:flex;flex-wrap:wrap;justify-content:space-between;gap:24px;align-items:center;}
.footer-links{display:flex;gap:20px;list-style:none;margin:0;padding:0;flex-wrap:wrap;}
.footer-links a{color:var(--ink-soft);text-decoration:none;font-size:.88rem;}
.footer-links a:hover{color:var(--accent);}
.footer-note{font-size:.82rem;color:var(--ink-soft);}

.content-page article p{margin-bottom:16px;}
.content-page article h2{margin-top:32px;}
.guide-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;text-decoration:none;color:var(--ink);display:block;margin-bottom:16px;
  transition:transform .15s ease, box-shadow .15s ease;
}
.guide-card:hover{transform:translateY(-2px);box-shadow:0 12px 28px -14px rgba(36,27,58,.2);}
.guide-card h3{margin-bottom:6px;font-size:1.1rem;}
.guide-card p{margin:0;font-size:.9rem;}

.section-title{margin-top:0;}
.small-note{font-size:.82rem;color:var(--ink-soft);margin-top:14px;}