* {
  box-sizing: border-box;
}

:root {
  --burgundy: #4f0227;
  --pink: #ff9fe6;
  --lime: #e9f05d;
  --cream: #f7efe9;
  --berry: #8a1250;
  --dark-text: #2a1820;
  --soft-text: #55424b;
  --line: rgba(79, 2, 39, 0.22);
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  background-color: var(--cream);
  background-image:
    linear-gradient(rgba(79, 2, 39, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 2, 39, 0.08) 1px, transparent 1px);
  background-size: 56px 56px;
  color: var(--dark-text);
  font-family: "Manrope", "Avenir Next", "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

button,
input,
select {
  font: inherit;
}

.converter-header,
.converter-section,
footer {
  width: min(100% - 40px, 920px);
  margin-right: auto;
  margin-left: auto;
}

.converter-header {
  padding-top: 34px;
}

.back-button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  padding: 0 14px;
  border: 2px solid var(--burgundy);
  border-radius: 999px;
  background: var(--lime);
  box-shadow: 3px 3px 0 var(--burgundy);
  color: var(--burgundy);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.back-button:hover,
.back-button:focus-visible {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--burgundy);
}

.header-content {
  position: relative;
  max-width: 700px;
  margin: 38px 0 25px;
}

.header-content::before,
.header-content::after {
  position: absolute;
  color: var(--pink);
  content: "✦";
  line-height: 1;
}

.header-content::before {
  top: 0.35rem;
  right: 4rem;
  font-size: 1.1rem;
}

.header-content::after {
  top: 3.25rem;
  right: 1.5rem;
  font-size: 0.7rem;
}

.eyebrow,
.field-group label,
.unit-box label,
.result-label,
.quick-title,
.panel-label {
  color: var(--berry);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.eyebrow {
  margin: 0 0 12px;
}

.header-content h1 {
  margin: 0;
  color: var(--burgundy);
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1.08;
}

.subtitle {
  max-width: 580px;
  margin: 15px 0 0;
  color: var(--soft-text);
  font-size: 0.98rem;
}

.converter-section {
  display: grid;
  gap: 26px;
  padding: 0 0 26px;
}

.converter-card {
  padding: clamp(22px, 4vw, 36px);
  border: 2px solid var(--burgundy);
  border-radius: 24px;
  background: var(--cream);
  box-shadow: 6px 6px 0 var(--pink);
}

.field-group {
  max-width: 360px;
  margin-bottom: 28px;
}

.field-group label,
.unit-box label {
  display: block;
  margin-bottom: 8px;
}

select,
.unit-box input {
  width: 100%;
  height: 48px;
  border: 2px solid var(--burgundy);
  border-radius: 12px;
  background: #fff;
  color: var(--dark-text);
  outline: none;
  transition: outline-color 0.2s ease, transform 0.2s ease;
}

select {
  padding: 0 14px;
  cursor: pointer;
}

select:focus-visible,
.unit-box input:focus-visible,
button:focus-visible,
a:focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 2px;
}

.conversion-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 48px minmax(0, 1fr);
  align-items: end;
  gap: 18px;
}

.unit-box {
  min-width: 0;
}

.unit-box input {
  display: block;
  margin-bottom: 10px;
  padding: 0 14px;
  font-size: 1.15rem;
  font-weight: 600;
}

.unit-box input::placeholder {
  color: var(--soft-text);
  font-size: 0.95rem;
  font-weight: 400;
}

.unit-box input[readonly] {
  background: #fff;
  color: var(--burgundy);
}

.swap-button {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  margin-bottom: 29px;
  border: 2px solid var(--burgundy);
  border-radius: 50%;
  background: var(--pink);
  box-shadow: 3px 3px 0 var(--burgundy);
  color: var(--burgundy);
  font-size: 1.25rem;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.2s ease;
}

.swap-button.is-swapped {
  transform: rotate(180deg);
}

.swap-button:hover,
.swap-button:focus-visible {
  box-shadow: 1px 1px 0 var(--burgundy);
}

.result-panel {
  margin-top: 25px;
  padding: 20px 22px;
  border: 2px solid var(--burgundy);
  border-radius: 16px;
  background: var(--lime);
  color: var(--burgundy);
}

.result-label {
  margin: 0 0 7px;
  color: var(--burgundy);
}

.result-panel h2 {
  margin: 0;
  color: var(--burgundy);
  font-size: clamp(1.15rem, 2.5vw, 1.45rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.4;
  overflow-wrap: anywhere;
}

#conversionDetails {
  margin: 6px 0 0;
  color: var(--burgundy);
  font-size: 0.82rem;
}

.conversion-formula {
  margin: 0.55rem 0 0;
  color: var(--berry);
  font-size: 0.78rem;
  font-weight: 800;
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1rem;
}

.result-actions button,
.history-heading button {
  min-height: 34px;
  padding: 0 0.65rem;
  border: 1.5px solid var(--burgundy);
  border-radius: 8px;
  background: var(--cream);
  box-shadow: 2px 2px 0 var(--burgundy);
  color: var(--burgundy);
  font: inherit;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.result-actions button:hover,
.result-actions button:focus-visible,
.history-heading button:hover,
.history-heading button:focus-visible {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 var(--burgundy);
}

#copyStatus {
  min-height: 1.2rem;
  color: var(--burgundy);
  font-size: 0.72rem;
  font-weight: 800;
}

.result-actions label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--burgundy);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.result-actions select {
  width: auto;
  height: 34px;
  padding: 0 0.5rem;
  font-size: 0.72rem;
}

.all-units-panel,
.history-panel {
  margin-top: 1.5rem;
  padding: 1rem;
  border: 2px solid var(--burgundy);
  border-radius: 14px;
  background: #fff;
  box-shadow: 4px 4px 0 var(--burgundy);
}

.all-units-panel h2,
.history-panel h2 {
  margin: 0;
  color: var(--burgundy);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
}

.all-units-panel > p,
.history-panel > p {
  margin: 0.35rem 0 0.8rem;
  color: var(--soft-text);
  font-size: 0.75rem;
}

.all-units-scroll {
  max-height: 220px;
  overflow: auto;
}

.all-units-panel table {
  width: 100%;
  border-collapse: collapse;
  color: var(--dark-text);
  font-size: 0.76rem;
}

.all-units-panel th,
.all-units-panel td {
  padding: 0.55rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.all-units-panel th:last-child,
.all-units-panel td:last-child {
  text-align: right;
}

.all-units-panel tbody tr {
  cursor: pointer;
  transition: background 0.2s ease;
}

.all-units-panel tbody tr:hover,
.all-units-panel tbody tr:focus-visible {
  background: var(--lime);
  outline: 2px solid var(--burgundy);
  outline-offset: -2px;
}

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

.history-list {
  display: grid;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.history-list button {
  width: 100%;
  padding: 0.6rem;
  border: 1.5px solid var(--burgundy);
  border-radius: 8px;
  background: var(--cream);
  color: var(--burgundy);
  font: inherit;
  font-size: 0.74rem;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}

.history-list button:hover,
.history-list button:focus-visible {
  background: var(--pink);
}

.quick-section {
  margin-top: 25px;
}

.quick-title {
  margin: 0 0 11px;
}

.quick-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.quick-buttons button {
  min-height: 38px;
  padding: 7px 13px;
  border: 2px solid var(--burgundy);
  border-radius: 999px;
  background: #fff;
  box-shadow: 3px 3px 0 var(--burgundy);
  color: var(--burgundy);
  font-size: 0.78rem;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.quick-buttons button:hover,
.quick-buttons button:focus-visible {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--burgundy);
  background: var(--pink);
}

.info-panel {
  padding: 4px 2px 0;
  border-top: 2px solid var(--burgundy);
}

.panel-label {
  margin: 19px 0 12px;
}

.conversion-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px 22px;
}

.conversion-list > div {
  min-width: 0;
  padding: 8px 0;
}

.conversion-list span {
  display: inline-block;
  min-width: 27px;
  color: var(--berry);
  font-size: 0.68rem;
  font-weight: 800;
}

.conversion-list strong {
  color: var(--burgundy);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
}

.conversion-list p {
  margin: 4px 0 0 27px;
  color: var(--soft-text);
  font-size: 0.72rem;
  line-height: 1.5;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0 28px;
  border-top: 2px solid var(--burgundy);
  color: var(--soft-text);
  font-size: 0.72rem;
}

footer p {
  margin: 0;
}

footer a {
  color: var(--burgundy);
  font-weight: 800;
  text-decoration-color: var(--pink);
  text-decoration-thickness: 2px;
  text-underline-offset: 2px;
}

footer a:hover,
footer a:focus-visible {
  color: var(--berry);
}

@media (max-width: 680px) {
  .converter-header,
  .converter-section,
  footer {
    width: min(100% - 32px, 520px);
  }

  .header-content {
    margin-top: 28px;
  }

  .conversion-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .swap-button {
    margin: 0 auto;
  }

  .conversion-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px 16px;
  }

  footer {
    flex-direction: column;
  }

  .result-actions {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 380px) {
  .converter-card {
    padding: 18px;
  }

  .conversion-list {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}