:root {
  --bg-color: #0f444f;
  --accent: #2ed0d0;
  --accent2: #0ba7a1;
  --text-light: #f0f0f0;
  --shadow: rgba(0, 0, 0, 0.25);
}

* {
  box-sizing: border-box;
}

body {
  font-family: "Inter", system-ui, sans-serif;
  background: linear-gradient(135deg, var(--bg-color), #15606b);
  color: var(--text-light);
  margin: 0;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

header {
  text-align: center;
  margin-bottom: 1.5rem;
}

header h1 {
  margin: 0;
  font-size: 2rem;
}

header p {
  opacity: 0.85;
  font-size: 1rem;
}

.container {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  box-shadow: 0 6px 20px var(--shadow);
  padding: 2rem;
  max-width: 720px;
  width: 100%;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

label {
  font-weight: 600;
  margin-bottom: 0.3rem;
  display: block;
}

input {
  width: 100%;
  padding: 0.6rem;
  font-size: 1rem;
  border-radius: 6px;
  border: none;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  transition: 0.2s ease;
}

input:focus {
  outline: 2px solid var(--accent);
  background: rgba(255, 255, 255, 0.25);
}

.unit-toggle {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-top: 1.5rem;
  font-weight: 600;
}

/* Toggle Switch */
.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: #ccc;
  border-radius: 24px;
  transition: 0.3s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  border-radius: 50%;
  transition: 0.3s;
}

input:checked + .slider {
  background-color: var(--accent2);
}

input:checked + .slider:before {
  transform: translateX(26px);
}

/* Output Box */
.output-box {
  margin-top: 2rem;
  background: rgba(0, 0, 0, 0.3);
  padding: 1rem;
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: monospace;
  font-size: 1rem;
}

.output-box code {
  word-break: break-all;
}

button#copyBtn {
  background: linear-gradient(135deg, var(--accent2), var(--accent));
  color: #000;
  font-weight: 600;
  border: none;
  border-radius: 6px;
  padding: 0.5rem 1rem;
  cursor: pointer;
  transition: 0.2s;
}

button#copyBtn:hover {
  transform: scale(1.05);
}

.example {
  text-align: center;
  margin-top: 2.5rem;
}

.example p {
  margin-top: 1rem;
  font-size: clamp(3.1rem, 2.171rem + 1.548vw, 4.4rem);
  color: #fff;
  transition: font-size 0.2s ease-in-out;
}

footer {
  margin-top: 2rem;
  opacity: 0.7;
  font-size: 0.9rem;
}

.extra-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.5rem;
  gap: 1rem;
}

.base-input {
  display: flex;
  flex-direction: column;
}

.base-input input {
  width: 100px;
  text-align: center;
}

footer a {
  color: #64ffda; /* soft teal accent */
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease, text-shadow 0.2s ease;
}

footer a:hover {
  color: #80cbc4; /* lighter teal on hover */
  text-shadow: 0 0 6px rgba(100, 255, 218, 0.6);
}