/* styles.css */
/* Shared styling for all calculators: clean layout + mobile polish */

:root{
  --bg:#0b1220;
  --panel:#111a2e;
  --panel2:#0f172a;
  --text:#e7edf7;
  --muted:#b8c4da;
  --line:rgba(255,255,255,.10);
  --accent:#62a6ff;
  --accent2:#7c3aed;
  --danger:#ff5b5b;
  --radius:16px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 20% 0%, rgba(98,166,255,.18), transparent),
              radial-gradient(900px 500px at 80% 20%, rgba(124,58,237,.16), transparent),
              var(--bg);
  color:var(--text);
  line-height:1.45;
}

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

.container{
  width:min(980px, 92vw);
  margin:0 auto;
  padding:24px 0 40px;
}

.site-header{
  position:sticky;
  top:0;
  z-index:20;
  backdrop-filter: blur(10px);
  background: linear-gradient(to bottom, rgba(11,18,32,.92), rgba(11,18,32,.72));
  border-bottom:1px solid var(--line);
}

.navbar{
  width:min(980px, 92vw);
  margin:0 auto;
  padding:14px 0;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}

.brand{
  font-weight:750;
  letter-spacing:.2px;
  display:flex;
  align-items:center;
  gap:10px;
}

.brand-badge{
  width:34px;
  height:34px;
  border-radius:12px;
  background: linear-gradient(135deg, rgba(98,166,255,.9), rgba(124,58,237,.9));
  box-shadow: 0 10px 24px rgba(0,0,0,.35);
}

.navlinks{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  justify-content:flex-end;
}

.navlinks a{
  padding:10px 12px;
  border:1px solid var(--line);
  border-radius:999px;
  background: rgba(255,255,255,.03);
  font-size:14px;
}

.navlinks a:hover{
  border-color: rgba(98,166,255,.55);
  background: rgba(98,166,255,.10);
  text-decoration:none;
}

.hero{
  padding:18px 0 10px;
}

h1{
  margin: 14px 0 8px;
  font-size: clamp(26px, 4vw, 40px);
  line-height:1.1;
}

.subtitle{
  margin:0;
  color:var(--muted);
  font-size: clamp(14px, 2.4vw, 16px);
}

.card{
  margin-top:18px;
  background: linear-gradient(180deg, rgba(17,26,46,.85), rgba(15,23,42,.85));
  border:1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 16px 40px rgba(0,0,0,.35);
  overflow:hidden;
}

.card-inner{
  padding:18px;
}

.grid{
  display:grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap:14px;
}

@media (max-width: 720px){
  .grid{ grid-template-columns: 1fr; }
  .navbar{ padding:12px 0; }
  .navlinks{ gap:8px; }
  .navlinks a{ padding:9px 11px; font-size:13px; }
  .card-inner{ padding:16px; }
}

label{
  display:block;
  font-size:14px;
  color:var(--muted);
  margin-bottom:6px;
}

input, select{
  width:100%;
  padding:12px 12px;
  border-radius:12px;
  border:1px solid var(--line);
  background: rgba(0,0,0,.20);
  color: var(--text);
  font-size:16px;
  outline:none;
}

input:focus, select:focus{
  border-color: rgba(98,166,255,.7);
  box-shadow: 0 0 0 3px rgba(98,166,255,.18);
}

.small{
  font-size:13px;
  color:var(--muted);
  margin-top:6px;
}

.btn-row{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  margin-top:14px;
}

button, .btn{
  appearance:none;
  border:none;
  cursor:pointer;
  padding:12px 14px;
  border-radius:12px;
  font-weight:700;
  font-size:16px;
  color:#081022;
  background: linear-gradient(135deg, rgba(98,166,255,1), rgba(124,58,237,1));
  box-shadow: 0 12px 28px rgba(0,0,0,.35);
}

button:hover, .btn:hover{
  filter: brightness(1.05);
}

.btn-secondary{
  color: var(--text);
  background: rgba(255,255,255,.06);
  border:1px solid var(--line);
  box-shadow:none;
}

.result{
  margin-top:14px;
  padding:14px;
  border-radius:14px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.04);
}

.result h2{
  margin:0 0 8px;
  font-size:18px;
}

.result p{
  margin:6px 0;
  color: var(--text);
}

.note{
  margin-top:12px;
  padding:12px 14px;
  border-radius:14px;
  border:1px solid rgba(98,166,255,.35);
  background: rgba(98,166,255,.08);
  color: var(--text);
}

.footer{
  margin-top:24px;
  color:var(--muted);
  font-size:13px;
  text-align:center;
  padding:14px 0 0;
}
.container {
  width:min(980px, 92vw);
  margin:0 auto;
  padding:90px 0 40px;
}
@media (max-width: 768px) {
  .site-header {
    position: static;
  }
}