/* Sleek Modern Dark Theme */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;700&display=swap');
:root {
  --bg: #0f0f10;
  --surface: rgba(28,28,30,0.92);
  --glass: rgba(28,28,30,0.85);
  --accent: #c58aff;
  --accent-dark: #9b66ff;
  --accent-gradient: linear-gradient(90deg, #c58aff 0%, #9b66ff 100%);
  --text: #F3F6F9;
  --error: #FF5370;
  --radius: 18px;
  --shadow: 0 8px 32px rgba(0,0,0,0.7);
  --blur: 18px;
}
body {
  background: radial-gradient(ellipse at top left, #181A20 60%, #101014 100%);
  color: var(--text);
  font-family: 'Inter', 'Roboto', Arial, sans-serif;
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.5s;
}
.container.glass {
  background: linear-gradient(180deg, rgba(22,22,24,0.95), rgba(28,28,30,0.95));
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.7), inset 0 1px 0 rgba(255,255,255,0.02);
  padding: 2.75rem 2.25rem 1.75rem 2.25rem;
  width: 100%;
  max-width: 460px;
  text-align: center;
  backdrop-filter: blur(var(--blur));
  border: 1px solid rgba(255,255,255,0.03);
  position: relative;
}
.gradient-text {
  margin-bottom: 1.5rem;
  font-size: 2.2rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  /* text-fill-color: transparent; (not supported) */
  letter-spacing: 0.02em;
}

.badge {
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  width: 46px;
  height: 46px;
  border-radius: 8px;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0b0710;
  font-weight: 700;
  box-shadow: 0 6px 20px rgba(149, 83, 255, 0.18);
}
form {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  margin-bottom: 1.2rem;
}
label {
  text-align: left;
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
  color: var(--text);
  display: flex;
  align-items: baseline;
  gap: 0.3em;
}
.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.2em;
}
input {
  background: rgba(12,12,14,0.6);
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.03);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  font-size: 1rem;
  outline: none;
  transition: box-shadow 0.15s, transform 0.08s;
  box-shadow: inset 0 -6px 18px rgba(0,0,0,0.6);
}
input:focus {
  box-shadow: 0 6px 20px rgba(155,102,255,0.12), inset 0 -6px 18px rgba(0,0,0,0.6);
  transform: translateY(-1px);
  border-color: rgba(155,102,255,0.12);
}
button.accent-btn {
  background: var(--accent);
  color: #0b0710;
  border: none;
  border-radius: 12px;
  padding: 0.95rem 1rem;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(181, 120, 255, 0.12);
  transition: transform 0.12s, box-shadow 0.12s;
  outline: none;
  width: 100%;
}
button.accent-btn:hover, button.accent-btn:focus {
  transform: translateY(-3px);
  box-shadow: 0 18px 40px rgba(155,102,255,0.18);
}
#result {
  margin-top: 2rem;
  font-size: 1.125rem;
  min-height: 2rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: color 0.12s, transform 0.12s;
  color: var(--accent);
}
footer {
  margin-top: 2.25rem;
  color: #999;
  font-size: 0.85rem;
  opacity: 0.7;
}
@media (max-width: 500px) {
  .container.glass {
    padding: 1rem;
    max-width: 98vw;
  }
  .gradient-text {
    font-size: 1.3rem;
  }
}