:root{
  --bg:#0f1724;
  --card:#0b1220;
  --muted:#9aa4b2;
  --accent1:#6ee7b7;
  --accent2:#60a5fa;
  --glass: rgba(255,255,255,0.04);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:Inter,Segoe UI,Roboto,Arial,sans-serif;
  background: linear-gradient(180deg,#071024 0%, #081426 40%, #07142a 100%);
  color:#e6eef8;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
.site-header{padding:18px 20px}
.header-row{display:flex;align-items:center;justify-content:space-between;gap:18px;max-width:1100px;margin:0 auto;padding:6px 12px}
.app-brand{margin:0;font-size:18px;letter-spacing:0.2px}

.mode-nav{display:flex;gap:10px;align-items:center}
.mode-item{appearance:none;border:0;padding:8px 14px;border-radius:999px;background:transparent;color:var(--muted);cursor:pointer;font-weight:700;transition:all .12s ease}
.mode-item.active{background:linear-gradient(90deg,var(--accent1),var(--accent2));color:#022;box-shadow:0 6px 16px rgba(96,165,250,0.08)}
.mode-item:hover{transform:translateY(-2px);color:#fff}

.main{max-width:1100px;margin:28px auto;padding:0 20px}
.title{text-align:center;margin:12px 0 24px;color:#eaf6ff}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.card{background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-radius:12px;padding:14px;box-shadow:0 8px 30px rgba(2,6,23,0.6);overflow:hidden}
.card-header{font-weight:700;font-size:18px;margin-bottom:8px}
.card-body{display:flex;flex-direction:column;gap:8px}
.card label{display:flex;justify-content:space-between;gap:12px;align-items:center;font-size:14px;color:var(--muted)}
.input{width:120px;padding:8px;border-radius:8px;border:1px solid rgba(255,255,255,0.04);background:transparent;color:inherit}
.calc-btn{margin-top:6px;padding:10px;border-radius:10px;border:0;background:linear-gradient(90deg,var(--accent1),var(--accent2));color:#022;font-weight:700;cursor:pointer}
.calc-btn:hover{filter:brightness(.98);transform:translateY(-1px)}
.result{margin-top:8px;padding:10px;border-radius:8px;background:var(--glass);color:var(--muted);font-size:14px}
.site-footer{text-align:center;padding:20px 0;color:var(--muted);opacity:0.9}

/* small responsive tweaks */
@media (max-width:520px){.mode-item{padding:6px 10px;font-size:13px}.input{width:100px}}

@media (max-width:720px){
  .header-row{flex-direction:column;align-items:center;gap:10px}
}

/* subtle animated highlight */
@keyframes slideGradient{from{background-position:0%}to{background-position:200%}}
.mode-nav::after{content:'';position:absolute;pointer-events:none}

/* focus styles */
.input:focus{outline:none;box-shadow:0 6px 16px rgba(96,165,250,0.08);border-color:rgba(96,165,250,0.18)}

/* utilities for pyramid input toggle */
.hidden{display:none !important}
.pyramid-mode{display:flex;gap:12px;align-items:center;font-size:13px;color:var(--muted);margin:6px 0}
.pyramid-mode input{margin-right:6px}

:root{
  --bg:#0f1724;
  --card:#0b1220;
  --muted:#9aa4b2;
  --accent1:#6ee7b7;
  --accent2:#60a5fa;
  --glass: rgba(255,255,255,0.04);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:Inter,Segoe UI,Roboto,Arial,sans-serif;
  background: linear-gradient(180deg,#071024 0%, #081426 40%, #07142a 100%);
  color:#e6eef8;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
.site-header{padding:20px 24px}
.header-row{display:flex;align-items:center;justify-content:center;gap:18px;max-width:1100px;margin:0 auto;padding:6px 12px}

.capsule-nav{
  .mode-nav{display:flex;gap:8px;align-items:center;padding:6px}
  .mode-item{padding:8px 12px;border-radius:999px;background:transparent;color:var(--muted);cursor:pointer;font-weight:700;transition:all .12s ease}
  .mode-item.active{background:linear-gradient(90deg,var(--accent1),var(--accent2));color:#022;box-shadow:0 6px 16px rgba(96,165,250,0.08)}
  .mode-item:hover{transform:translateY(-2px);color:#fff}
  color:#022;
  box-shadow:0 6px 18px rgba(96,165,250,0.12);
}

.main{max-width:1100px;margin:28px auto;padding:0 20px}
.title{text-align:center;margin:12px 0 24px;color:#eaf6ff}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.card{background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-radius:12px;padding:14px;box-shadow:0 8px 30px rgba(2,6,23,0.6);overflow:hidden}
.card-header{font-weight:700;font-size:18px;margin-bottom:8px}
.card-body{display:flex;flex-direction:column;gap:8px}
.card label{display:flex;justify-content:space-between;gap:12px;align-items:center;font-size:14px;color:var(--muted)}
.input{width:120px;padding:8px;border-radius:8px;border:1px solid rgba(255,255,255,0.04);background:transparent;color:inherit}
.calc-btn{margin-top:6px;padding:10px;border-radius:10px;border:0;background:linear-gradient(90deg,var(--accent1),var(--accent2));color:#022;font-weight:700;cursor:pointer}
.calc-btn:hover{filter:brightness(.98);transform:translateY(-1px)}
.result{margin-top:8px;padding:10px;border-radius:8px;background:var(--glass);color:var(--muted);font-size:14px}
.site-footer{text-align:center;padding:20px 0;color:var(--muted);opacity:0.9}

/* small responsive tweaks */
@media (max-width:520px){.nav-item{padding:8px 12px;font-size:13px}.input{width:100px}}

@media (max-width:720px){
  .header-row{flex-direction:column;align-items:center;gap:10px}
}

/* subtle animated highlight that moves across the nav */
@keyframes slideGradient{from{background-position:0%}to{background-position:200%}}
.capsule-nav::after{
  content:'';position:absolute;inset:0;z-index:0;background:linear-gradient(90deg,var(--accent1),var(--accent2),#7dd3fc);
  background-size:200% 100%;opacity:0.06;animation:slideGradient 6s linear infinite}

/* focus styles */
.input:focus{outline:none;box-shadow:0 6px 16px rgba(96,165,250,0.08);border-color:rgba(96,165,250,0.18)}