:root {
  --accent: #ff5722;
  --bg: #0d0d0d;
  --card-bg: #161616;
  --input-bg: #0d0d0d;
  --text-clr: #f0f0f0;
  --input-text-clr: #555;
  --header-clr: #fff;
}
      
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body{ 
  background: var(--bg);
  color: var(--text-clr);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 48px 16px;
}

.header {
  padding-top: 60px;
  text-align: center;
  margin-bottom: 48px;
}

.header h1{
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--header-clr);
}

.header h1 span {
  color: var(--accent);
}

.header p {
  margin-top: 8px;
  font-size: 0.85rem;
  color: #666;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.card{
  background: var(--card-bg);
  border: 1px solid #222;
  color: var(--text-clr);
  padding: 28px;
  transition: border-color 0.2s;
  border-radius: 16px;
}

.card-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

input{
  color: var(--text-clr);
  padding: 10px 0px;
  border-radius: 8px;
  margin-bottom: 0px;
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
}

.input-row{
  background: var(--input-bg);
  color: var(--input-text-clr);
  display: flex;
  align-items: center;
  padding: 4px 4px 4px 12px;
  border-radius: 8px;
  border: 1px solid #2a2a2a;

}

.input-unit{
  color: var(--input-text-clr);
  font-size: .75rem;
  padding: 0px 12px;
  white-space: nowrap;
  align-self: center
}

button{
  background: var(--accent);
  color: var(--text-clr);
  width: 100%;
  padding: 5px;
  border-radius: 8px;
  transition: background 0.2s;
  
}

button:hover{
  background: #e64a19;
}

.card:focus-within{
  border-color: #ff5722;
}

/* ── Results ── */
.result-row{
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 16px;
  background: #0d0d0d;
  border-radius: 10px;
  border: 1px solid #1e1e1e;
}

.result-label {
  font-size: 0.8rem;
  color: #666;
}

.result-value {
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.5px;
}

.result-value span {
  font-size: 0.8rem;
  font-weight: 500;
  color:#555;
  margin-left: 4px;
}

.result-value.highlight {
  color: #ff5722;
}

.highlight {
  color: var(--accent);
}

.grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  width: 100%;
  max-width:900px;
}

.footer{
  margin-top: 48px;
  font-size: 0.75rem;
  color: #333;
  text-align: center;
  line-height: 1.8;
}

a.button {
  display: inline-block;
  padding: 14px 24px;
  background: var(--accent);
  color: var(--header-clr);
  text-decoration: none;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.9rem;
  transition: background 0.2s, transform 0.1s;
}

a.button:hover {
  background: #e64a19;
  transform: translateY(-1px);
}