/* Modern, clean UI with light/dark auto theme */
:root {
  --bg: #0b0f14;
  --panel: #0f1520;
  --muted: #1b2838;
  --text: #e6edf3;
  --subtle: #9fb0c0;
  --primary: #4cc9f0;
  --accent: #80ffea;
  --danger: #ff6b6b;
  --ring: 0 0 0 2px rgba(76, 201, 240, 0.35);
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f9fc;
    --panel: #ffffff;
    --muted: #eef2f7;
    --text: #0b1320;
    --subtle: #5b6b7b;
    --primary: #2563eb;
    --accent: #14b8a6;
    --danger: #dc2626;
    --ring: 0 0 0 2px rgba(37, 99, 235, 0.25);
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 600px at 10% -10%, #1a2230 0%, transparent 60%),
              radial-gradient(1000px 500px at 120% 10%, #20304a 0%, transparent 60%),
              var(--bg);
}
.page { max-width: 980px; margin: 0 auto; padding: 24px; }

.header { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.brand { display: flex; align-items: center; gap: 10px; }
.title { font-size: 1.5rem; margin: 0; letter-spacing: 0.2px; }
.logo { filter: drop-shadow(0 2px 6px rgba(0,0,0,.25)); }

.header-actions { display: flex; align-items: end; gap: 10px; }
.control { display: grid; gap: 6px; }
.select {
  appearance: none;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,.08);
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));
  color: var(--text);
  /* Force native dropdown to light theme for better contrast on Windows */
  color-scheme: light;
}

/* Ensure option text remains readable in native dropdowns (often white bg on Windows) */
select option { color: #0b1320; }

.card {
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));
  border: 1px solid rgba(255,255,255,.08);
  backdrop-filter: blur(6px);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
}

.inputs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.field { display: grid; gap: 8px; }
.label { font-size: .9rem; color: var(--subtle); }
.help { color: var(--subtle); font-size: .8rem; }

.input-wrap { position: relative; }
.prefix, .suffix {
  position: absolute; inset: 0 auto 0 10px; display: grid; place-items: center; color: var(--subtle);
}
.suffix { inset: 0 10px 0 auto; }

.input {
  width: 100%;
  padding: 12px 14px;
  padding-left: 32px;
  padding-right: 32px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,.08);
  background: rgba(0,0,0,.25);
  color: var(--text);
  outline: none;
  transition: box-shadow .15s ease, border-color .15s ease, background .15s ease;
}
.input:hover { background: rgba(0,0,0,.3); }
.input:focus { box-shadow: var(--ring); border-color: rgba(76, 201, 240, 0.35); }

.results {
  margin-top: 18px; padding-top: 16px; border-top: 1px dashed rgba(255,255,255,.15);
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px;
}
.result { background: rgba(0,0,0,.18); border: 1px solid rgba(255,255,255,.08); padding: 14px; border-radius: 12px; }
.result .result-label { color: var(--subtle); font-size: .85rem; }
.result .result-value { font-weight: 700; font-size: 1.25rem; margin-top: 4px; letter-spacing: .2px; }
.result.subtle { background: transparent; border-style: dashed; }

.footer { color: var(--subtle); margin-top: 14px; font-size: .9rem; display:flex; align-items:center; gap:8px; }

.button {
  border: 1px solid rgba(255,255,255,.1);
  background: linear-gradient(180deg, rgba(255,255,255,.12), rgba(255,255,255,.04));
  color: var(--text);
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
}
.button:hover { filter: brightness(1.05); }
.button:active { transform: translateY(1px); }
.button.ghost { background: transparent; }

@media (max-width: 520px) {
  .header { flex-direction: column; align-items: stretch; }
  .header-actions { justify-content: space-between; }
}