/* Yellow World — simple responsive styling */

:root {
  --yellow-100: #fff9c4;
  --yellow-200: #fff176;
  --yellow-300: #fdd835;
  --yellow-500: #f9a825;
  --brown-900: #3d3200;
  --white: #ffffff;
  --border: #d7bd28;
  --shadow: rgba(61, 50, 0, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--brown-900);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top right, #ffffff 0, transparent 25rem),
    linear-gradient(135deg, var(--yellow-100), var(--yellow-200));
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  width: min(900px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0;
}

.hero {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.sun {
  display: grid;
  flex: 0 0 5rem;
  width: 5rem;
  height: 5rem;
  place-items: center;
  border: 2px solid var(--brown-900);
  border-radius: 50%;
  background: var(--yellow-300);
  font-size: 2.5rem;
  box-shadow: 6px 6px 0 var(--brown-900);
}

.eyebrow {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0.3rem;
  font-size: clamp(2rem, 7vw, 4rem);
  line-height: 1;
}

h2 {
  margin-bottom: 1rem;
}

.subtitle {
  margin-bottom: 0;
  font-size: 1.05rem;
}

.converter-card,
.history-card {
  margin-bottom: 1.25rem;
  padding: 1.25rem;
  border: 2px solid var(--brown-900);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 7px 7px 0 var(--brown-900);
}

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

label {
  display: grid;
  gap: 0.4rem;
  font-weight: 700;
}

input,
select {
  width: 100%;
  min-height: 3rem;
  padding: 0.65rem 0.75rem;
  color: var(--brown-900);
  border: 2px solid var(--border);
  border-radius: 0.65rem;
  background: var(--white);
}

input:focus,
select:focus,
button:focus-visible {
  outline: 3px solid var(--yellow-500);
  outline-offset: 2px;
}

.primary-button,
.secondary-button {
  min-height: 3rem;
  align-self: end;
  padding: 0.7rem 1rem;
  border: 2px solid var(--brown-900);
  border-radius: 0.65rem;
  font-weight: 800;
}

.primary-button {
  color: var(--brown-900);
  background: var(--yellow-300);
  box-shadow: 4px 4px 0 var(--brown-900);
}

.secondary-button {
  color: var(--brown-900);
  background: var(--yellow-100);
}

.primary-button:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--brown-900);
}

.result-panel {
  margin-top: 1.25rem;
  padding: 1rem;
  border-left: 0.5rem solid var(--yellow-500);
  border-radius: 0.65rem;
  background: var(--yellow-100);
}

.result-label {
  margin-bottom: 0.2rem;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.result-value {
  margin-bottom: 0.25rem;
  font-size: clamp(1.7rem, 7vw, 3rem);
  font-weight: 900;
  overflow-wrap: anywhere;
}

.formula {
  margin-bottom: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.section-heading h2 {
  margin-bottom: 0;
}

.text-button {
  padding: 0.45rem 0.7rem;
  color: var(--brown-900);
  border: 0;
  border-radius: 0.5rem;
  background: transparent;
  font-weight: 800;
  text-decoration: underline;
}

.history-list {
  display: grid;
  gap: 0.65rem;
  margin: 1rem 0 0;
  padding-left: 1.5rem;
}

.history-list li {
  padding: 0.6rem;
  border-radius: 0.5rem;
  background: var(--yellow-100);
}

.empty-message {
  font-style: italic;
  opacity: 0.7;
}

footer {
  text-align: center;
}

code {
  padding: 0.1rem 0.3rem;
  border-radius: 0.25rem;
  background: rgba(255, 255, 255, 0.6);
}

@media (max-width: 600px) {
  .app-shell {
    width: min(100% - 1rem, 900px);
    padding-top: 1rem;
  }

  .hero {
    align-items: flex-start;
  }

  .sun {
    flex-basis: 3.75rem;
    width: 3.75rem;
    height: 3.75rem;
    font-size: 1.8rem;
    box-shadow: 4px 4px 0 var(--brown-900);
  }

  .form-grid {
    grid-template-columns: 1fr;
  }
}