@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@500;600;700&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root{
  --navy:#0B1220;
  --teal:#123347;
  --amber:#FFB400;
  --cream:#F5F2EA;
  --rust:#C1432A;
  --slate:#5C6B7A;
  --board-line:#1E4258;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--navy);
  color:var(--cream);
  font-family:'Inter',sans-serif;
  -webkit-font-smoothing:antialiased;
}

a{color:inherit;text-decoration:none;}

.wrap{max-width:920px;margin:0 auto;padding:0 24px;}

/* ---------- NAV ---------- */
.topnav{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:20px 24px;
  border-bottom:1px solid var(--board-line);
}
.brand{
  font-family:'Oswald',sans-serif;
  font-weight:700;
  letter-spacing:0.08em;
  text-transform:uppercase;
  font-size:18px;
  color:var(--amber);
}
.brand span{color:var(--cream);}
.navlinks{display:flex;gap:28px;font-family:'IBM Plex Mono',monospace;font-size:13px;letter-spacing:0.04em;}
.navlinks a{color:var(--slate);transition:color .15s;}
.navlinks a:hover, .navlinks a.active{color:var(--amber);}

/* ---------- HERO / BOARD ---------- */
.board-hero{padding:64px 0 32px;}
.eyebrow{
  font-family:'IBM Plex Mono',monospace;
  color:var(--amber);
  font-size:13px;
  letter-spacing:0.12em;
  text-transform:uppercase;
  margin-bottom:10px;
}
h1.board-title{
  font-family:'Oswald',sans-serif;
  font-weight:700;
  text-transform:uppercase;
  letter-spacing:0.02em;
  font-size:clamp(32px,5vw,52px);
  line-height:1.05;
  margin:0 0 14px;
}
.board-sub{
  color:var(--slate);
  font-size:16px;
  max-width:560px;
  line-height:1.55;
  margin-bottom:40px;
}

/* board panel */
.board{
  background:var(--teal);
  border:1px solid var(--board-line);
  border-radius:4px;
  overflow:hidden;
  box-shadow:0 20px 60px -20px rgba(0,0,0,0.6);
}
.board-row{
  display:grid;
  grid-template-columns:120px 1fr 140px;
  align-items:center;
  border-bottom:1px solid var(--board-line);
  padding:16px 22px;
  gap:16px;
}
.board-row:last-child{border-bottom:none;}
.board-label{
  font-family:'IBM Plex Mono',monospace;
  font-size:12px;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--amber);
}
.board-row input, .board-row select{
  width:100%;
  background:var(--navy);
  border:1px solid var(--board-line);
  color:var(--cream);
  font-family:'IBM Plex Mono',monospace;
  font-size:15px;
  padding:10px 12px;
  border-radius:2px;
}
.board-row input:focus, .board-row select:focus{
  outline:2px solid var(--amber);
  outline-offset:1px;
}
.board-row .unit{font-family:'IBM Plex Mono',monospace;color:var(--slate);font-size:13px;}

.calc-btn{
  width:100%;
  background:var(--amber);
  color:var(--navy);
  font-family:'Oswald',sans-serif;
  font-weight:600;
  text-transform:uppercase;
  letter-spacing:0.06em;
  font-size:15px;
  padding:18px;
  border:none;
  cursor:pointer;
  transition:filter .15s;
}
.calc-btn:hover{filter:brightness(1.08);}
.calc-btn:focus-visible{outline:3px solid var(--cream);outline-offset:2px;}

/* ---------- SPLIT FLAP RESULT ---------- */
.result-zone{margin-top:28px;min-height:140px;}
.flap-display{
  display:none;
  background:var(--navy);
  border:1px solid var(--board-line);
  border-radius:4px;
  padding:28px;
  text-align:center;
}
.flap-display.show{display:block;animation:flapIn .35s ease-out;}
@keyframes flapIn{
  from{opacity:0;transform:translateY(-6px);}
  to{opacity:1;transform:translateY(0);}
}
.flap-verdict{
  font-family:'Oswald',sans-serif;
  font-weight:700;
  text-transform:uppercase;
  font-size:clamp(28px,6vw,44px);
  letter-spacing:0.04em;
  margin:0 0 8px;
}
.flap-verdict.good{color:var(--amber);}
.flap-verdict.fair{color:var(--cream);}
.flap-verdict.over{color:var(--rust);}
.flap-detail{
  font-family:'IBM Plex Mono',monospace;
  color:var(--slate);
  font-size:14px;
  line-height:1.6;
}
.flap-detail b{color:var(--cream);}

@media (prefers-reduced-motion: reduce){
  .flap-display.show{animation:none;}
}

/* ---------- SECTIONS ---------- */
section{padding:56px 0;border-top:1px solid var(--board-line);}
h2.sec-title{
  font-family:'Oswald',sans-serif;
  font-weight:600;
  text-transform:uppercase;
  letter-spacing:0.03em;
  font-size:26px;
  margin-bottom:8px;
}
.sec-sub{color:var(--slate);margin-bottom:32px;font-size:15px;}

/* deal cards */
.deal-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px;}
.deal-card{
  background:var(--teal);
  border:1px solid var(--board-line);
  border-radius:4px;
  padding:22px;
  display:flex;
  flex-direction:column;
  gap:10px;
}
.deal-card .tag{
  font-family:'IBM Plex Mono',monospace;
  font-size:11px;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--amber);
}
.deal-card h3{
  font-family:'Oswald',sans-serif;
  font-size:19px;
  margin:0;
  text-transform:uppercase;
}
.deal-card p{color:var(--slate);font-size:14px;line-height:1.5;margin:0;}
.deal-card .go{
  margin-top:auto;
  font-family:'IBM Plex Mono',monospace;
  font-size:13px;
  color:var(--cream);
  border-top:1px solid var(--board-line);
  padding-top:12px;
  display:flex;
  justify-content:space-between;
}
.deal-card .go:hover{color:var(--amber);}

/* guide accordion */
.guide-item{border-top:1px solid var(--board-line);}
.guide-item:last-child{border-bottom:1px solid var(--board-line);}
.guide-q{
  width:100%;
  background:none;
  border:none;
  color:var(--cream);
  text-align:left;
  font-family:'Oswald',sans-serif;
  font-size:17px;
  text-transform:uppercase;
  letter-spacing:0.02em;
  padding:20px 0;
  cursor:pointer;
  display:flex;
  justify-content:space-between;
  align-items:center;
}
.guide-q .mark{color:var(--amber);font-family:'IBM Plex Mono',monospace;}
.guide-a{
  display:none;
  color:var(--slate);
  font-size:15px;
  line-height:1.65;
  padding-bottom:22px;
  max-width:680px;
}
.guide-a.open{display:block;}

/* ad slot */
.ad-slot{
  border:1px dashed var(--board-line);
  color:var(--slate);
  font-family:'IBM Plex Mono',monospace;
  font-size:12px;
  text-align:center;
  padding:18px;
  letter-spacing:0.05em;
  text-transform:uppercase;
  margin:36px 0;
}

/* ---------- COLLAPSIBLE TOGGLE TABLES ---------- */
.toggle-head{
  width:100%;
  background:none;
  border:none;
  color:var(--cream);
  text-align:left;
  cursor:pointer;
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:16px;
  padding:0;
}
.toggle-head .mark{
  font-family:'IBM Plex Mono',monospace;
  color:var(--amber);
  font-size:22px;
  line-height:1;
  flex-shrink:0;
  margin-top:2px;
}
.toggle-body{
  display:none;
  margin-top:24px;
}
.toggle-body.open{display:block;}

.search-box{
  width:100%;
  background:var(--teal);
  border:1px solid var(--board-line);
  color:var(--cream);
  font-family:'IBM Plex Mono',monospace;
  font-size:14px;
  padding:12px 16px;
  border-radius:4px 4px 0 0;
  margin-bottom:0;
}
.search-box:focus{outline:2px solid var(--amber);outline-offset:-1px;}
.search-box::placeholder{color:var(--slate);}

.scroll-table{
  max-height:340px;
  overflow-y:auto;
  border-top:none;
}
.scroll-table thead th{
  position:sticky;
  top:0;
  background:var(--teal);
  z-index:1;
}

footer{
  border-top:1px solid var(--board-line);
  padding:32px 0 48px;
  color:var(--slate);
  font-family:'IBM Plex Mono',monospace;
  font-size:12px;
  text-align:center;
}

@media (max-width:600px){
  .board-row{grid-template-columns:1fr;gap:6px;}
  .board-label{margin-bottom:2px;}
}