:root {
  --bg: #f3f4f8;
  --card: #ffffff;
  --line: #e4e8ef;
  --text: #1f2937;
  --muted: #6b7280;
  --soft: #8f99aa;
  --blue: #3b82f6;
  --blue-strong: #2f6ed3;
  --blue-soft: #eaf1ff;
  --navy: #374151;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.06), 0 8px 24px rgba(15, 23, 42, 0.04);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.45;
}

.site-shell {
  width: min(980px, 98vw);
  margin: 0 auto;
  padding: 1.1rem 0 2.2rem;
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

.hero {
  text-align: center;
}

.hero h1 {
  font-size: clamp(1.45rem, 7.4vw, 2.95rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  max-width: none;
  white-space: nowrap;
  margin: 0 auto;
}

.hero-sub {
  margin-top: 0.32rem;
  color: var(--muted);
  font-size: 0.86rem;
}

.quick-form {
  margin: 0.84rem auto 0;
  max-width: 660px;
}

.quick-input-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.5rem;
  align-items: center;
  background: var(--card);
  border: 1px solid #cfe0fb;
  border-radius: 10px;
  padding: 0.42rem 0.48rem;
  box-shadow: var(--shadow);
}

.quick-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: #9bb0d1;
  font-size: 0.95rem;
}

input,
select,
button {
  font: inherit;
}

#quick-input,
#main-value,
#converted-value,
select {
  border: 1px solid #d8deea;
  border-radius: 8px;
  padding: 0.55rem 0.62rem;
  color: var(--text);
  background: #ffffff;
}

#quick-input {
  border: none;
  padding: 0.55rem 0.2rem;
  background: transparent;
}

#quick-input:focus {
  outline: none;
}

.quick-input-row button {
  border: none;
  border-radius: 7px;
  background: linear-gradient(180deg, #5b9cff, #3b82f6);
  color: #ffffff;
  font-size: 0.74rem;
  font-weight: 700;
  padding: 0.52rem 0.88rem;
  cursor: pointer;
}

.quick-result,
.fx-status {
  margin-top: 0.43rem;
  font-size: 0.75rem;
  text-align: left;
  color: var(--muted);
}

.quick-suggestions {
  margin-top: 0.34rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.22rem;
}

.quick-suggestion-chip {
  border: 1px solid #d7e1f1;
  border-radius: 999px;
  background: #f8fbff;
  color: #4f6da4;
  font-size: 0.6rem;
  font-weight: 700;
  padding: 0.18rem 0.4rem;
  cursor: pointer;
}

.quick-result.error,
.fx-status.error {
  color: #b42318;
}

.quick-result.success,
.fx-status.live {
  color: #0f766e;
}

.fx-trust {
  margin-top: 0.16rem;
  font-size: 0.63rem;
  color: #74839b;
  text-align: left;
}

.fx-trust.warn {
  color: #9a3412;
}

.fx-trust.good {
  color: #166534;
}

.categories-line {
  margin-top: 0.68rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.categories-label {
  color: var(--soft);
  font-size: 0.72rem;
  font-weight: 600;
}

.category-chip-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.28rem;
}

.category-chip {
  border: 1px solid #d6deeb;
  border-radius: 999px;
  background: #ffffff;
  color: #4b5563;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.33rem 0.72rem;
  cursor: pointer;
}

.category-chip.active {
  border-color: #384150;
  background: #374151;
  color: #ffffff;
}

.converter-section {
  margin-top: 1rem;
}

.converter-section h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.converter-sub {
  margin-top: 0.13rem;
  font-size: 0.78rem;
  color: var(--muted);
}

.converter-layout {
  margin-top: 0.64rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(168px, 31%);
  gap: 0.52rem;
}

.converter-card,
.history-card,
.tip-card,
.info-card,
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
}

.converter-card {
  padding: 0.62rem;
}

.field-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 32px minmax(0, 1fr);
  gap: 0.52rem;
  align-items: end;
}

.field-block label {
  display: block;
  margin-bottom: 0.18rem;
  color: var(--soft);
  font-size: 0.64rem;
  font-weight: 700;
}

.field-block {
  min-width: 0;
}

.split-input {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.4fr);
  gap: 0.34rem;
  min-width: 0;
}

#main-value,
#converted-value {
  font-size: 1.12rem;
  font-weight: 700;
  color: #1e3a8a;
  background: #f8fbff;
}

#main-value,
#converted-value,
.split-input select {
  min-width: 0;
}

#converted-value {
  text-align: right;
}

.split-input select {
  font-size: 0.64rem;
  color: var(--muted);
}

.swap-btn {
  width: 32px;
  height: 32px;
  border: 1px solid #d8deea;
  border-radius: 999px;
  background: #ffffff;
  color: #8b96a8;
  cursor: pointer;
}

.formula-line {
  margin: 0.52rem auto 0;
  width: fit-content;
  border: 1px solid #dce6fb;
  border-radius: 999px;
  background: #f5f9ff;
  color: #6a86c6;
  font-size: 0.63rem;
  padding: 0.2rem 0.58rem;
  font-weight: 600;
}

.action-row {
  margin-top: 0.58rem;
  display: grid;
  grid-template-columns: 1fr auto auto auto auto;
  gap: 0.35rem;
}

.in-card-info-grid {
  margin-top: 0.54rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.44rem;
}

.inline-info-pane {
  border: 1px solid #e7ecf4;
  border-radius: 8px;
  background: #fbfcff;
  padding: 0.46rem;
}

.inline-info-pane h3 {
  font-size: 0.75rem;
  font-weight: 700;
}

.inline-info-pane p {
  margin-top: 0.24rem;
  color: var(--muted);
  font-size: 0.64rem;
}

.inline-info-pane .formula-chip {
  margin-top: 0.34rem;
}

.primary-btn,
.icon-btn,
#clear-history-btn,
.subtle-btn {
  border: none;
  cursor: pointer;
}

.primary-btn {
  border-radius: 8px;
  background: linear-gradient(180deg, #4f90f7, #367ce9);
  color: #ffffff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.56rem 0.72rem;
}

.icon-btn {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: #f5f7fb;
  color: #7a879a;
  border: 1px solid #d9e0eb;
  font-size: 0.84rem;
}

.icon-btn.active {
  color: #f59e0b;
  background: #fff8e7;
  border-color: #f9d38e;
}

.right-column {
  display: block;
}

.history-card {
  padding: 0.52rem;
}

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.38rem;
}

.card-head h3,
.tip-card h3,
.info-card h3,
.design-label h3 {
  font-size: 0.78rem;
  font-weight: 700;
}

#clear-history-btn {
  background: transparent;
  color: #7f8da5;
  font-size: 0.63rem;
  font-weight: 700;
}

.history-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.32rem;
}

.history-list li {
  border-top: 1px solid #eef2f8;
  padding-top: 0.32rem;
}

.history-main {
  color: #374151;
  font-size: 0.67rem;
  font-weight: 700;
}

.history-time {
  color: #9aa6ba;
  font-size: 0.59rem;
  margin-top: 0.08rem;
}

.history-empty {
  color: #9aa6ba;
  font-size: 0.64rem;
}

.tip-card {
  background: #eef5ff;
  border-color: #dbe9ff;
  padding: 0.62rem;
}

.tip-card p {
  margin-top: 0.18rem;
  color: #5876a6;
  font-size: 0.67rem;
}

#save-workflow-btn,
#refresh-multi-target,
#run-batch-btn {
  background: transparent;
  color: #7f8da5;
  font-size: 0.63rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
}

.workflows-card {
  padding-top: 0.5rem;
}

.workflow-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.35rem;
  align-items: center;
}

.workflow-actions {
  display: flex;
  gap: 0.22rem;
}

.workflow-btn {
  border: 1px solid #d8deea;
  background: #f8fbff;
  color: #6b7b95;
  border-radius: 6px;
  font-size: 0.58rem;
  font-weight: 700;
  padding: 0.18rem 0.32rem;
  cursor: pointer;
}

#loan-reset-btn {
  background: transparent;
  color: #7f8da5;
  font-size: 0.63rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
}

.loan-card {
  padding: 0.54rem;
}

.loan-grid {
  display: grid;
  gap: 0.34rem;
}

.loan-field {
  display: grid;
  gap: 0.16rem;
  color: #7d8aa1;
  font-size: 0.59rem;
  font-weight: 700;
}

.loan-field input {
  border: 1px solid #d9e1ee;
  border-radius: 8px;
  background: #f8fbff;
  color: #21324a;
  font-size: 0.68rem;
  padding: 0.44rem 0.48rem;
}

.loan-calc-btn {
  width: 100%;
  margin-top: 0.4rem;
  font-size: 0.66rem;
  padding: 0.48rem 0.58rem;
}

.loan-summary {
  margin-top: 0.42rem;
  display: grid;
  gap: 0.16rem;
}

.loan-summary p {
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.32rem;
  border-top: 1px solid #eef2f8;
  padding-top: 0.24rem;
  color: #77839a;
  font-size: 0.62rem;
}

.loan-summary strong {
  color: #1f3f73;
  font-size: 0.71rem;
}

.loan-note {
  margin-top: 0.36rem;
  color: #8b96a9;
  font-size: 0.58rem;
}

.info-grid {
  margin-top: 0.58rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem;
}

.info-card {
  padding: 0.56rem;
}

.info-card p {
  margin-top: 0.3rem;
  color: var(--muted);
  font-size: 0.67rem;
}

.formula-chip {
  margin-top: 0.46rem;
  border: 1px solid #dce6fb;
  background: #f8fbff;
  color: #3b82f6;
  border-radius: 6px;
  padding: 0.3rem 0.42rem;
  width: fit-content;
  font-size: 0.63rem;
  font-weight: 700;
}

.ref-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.28rem;
}

.ref-table th,
.ref-table td {
  font-size: 0.64rem;
  border-bottom: 1px solid #eef2f7;
  padding: 0.22rem 0;
  text-align: left;
}

.ref-table th {
  color: #8b97aa;
  font-weight: 700;
}

.multi-target-card,
.batch-card {
  margin-top: 0;
}

.utility-grid {
  margin-top: 0.55rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem;
}

.multi-target-table td:last-child,
.multi-target-table th:last-child {
  text-align: right;
}

.batch-help {
  margin-top: 0.15rem;
  color: #7b879c;
  font-size: 0.62rem;
}

.batch-input {
  margin-top: 0.42rem;
  width: 100%;
  min-height: 76px;
  resize: vertical;
  border: 1px solid #d8deea;
  border-radius: 8px;
  padding: 0.42rem 0.48rem;
  background: #fbfcff;
  color: #334155;
  font-size: 0.7rem;
  line-height: 1.4;
}

.batch-output {
  margin: 0.42rem 0 0;
  min-height: 54px;
  max-height: 176px;
  overflow: auto;
  border: 1px solid #e4e9f3;
  border-radius: 8px;
  background: #f8fbff;
  color: #4b5563;
  padding: 0.45rem;
  font-size: 0.65rem;
  line-height: 1.4;
  white-space: pre-wrap;
}

.design-section {
  margin-top: 1.55rem;
}

.design-section h2 {
  font-size: clamp(1.35rem, 2.5vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.design-sub {
  margin-top: 0.24rem;
  color: var(--muted);
  font-size: 0.74rem;
  max-width: 650px;
}

.design-label {
  margin-top: 0.98rem;
  display: flex;
  align-items: center;
  gap: 0.34rem;
}

.label-dot,
.label-check {
  width: 14px;
  height: 14px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  font-size: 0.62rem;
  font-weight: 800;
}

.label-dot {
  background: #dceafe;
  border: 1px solid #bfd7ff;
}

.label-check {
  background: #e6f0ff;
  color: #3b82f6;
}

.design-grid-top {
  margin-top: 0.45rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem;
}

.panel {
  padding: 0.62rem;
}

.panel-kicker {
  color: #9ba7ba;
  font-size: 0.56rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.palette-intro {
  margin-top: 0.24rem;
  color: #6b7280;
  font-size: 0.64rem;
}

.palette-controls {
  margin-top: 0.45rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.4rem;
}

.palette-control {
  display: flex;
  flex-direction: column;
  gap: 0.16rem;
  color: #8b97aa;
  font-size: 0.58rem;
  font-weight: 700;
}

.palette-control-wide {
  grid-column: 1 / -1;
}

.palette-control input[type="color"] {
  width: 100%;
  height: 32px;
  border-radius: 7px;
}

.palette-control input[type="text"],
.palette-control select {
  border: 1px solid #d8deea;
  border-radius: 7px;
  background: #ffffff;
  color: #4b5563;
  font-size: 0.63rem;
  padding: 0.42rem 0.46rem;
}

.palette-swatches {
  margin-top: 0.45rem;
  display: grid;
  gap: 0.42rem;
}

.palette-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.38rem;
  border: 1px solid #ebeff5;
  border-radius: 8px;
  padding: 0.34rem 0.4rem;
}

.palette-dot {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 1px solid rgba(16, 24, 40, 0.08);
}

.palette-name {
  font-size: 0.65rem;
  font-weight: 700;
}

.palette-note {
  color: #9ba7ba;
  font-size: 0.55rem;
  margin-top: 0.03rem;
}

.palette-role {
  color: #9aa6b9;
  font-size: 0.54rem;
  font-weight: 600;
}

.subtle-btn {
  margin-top: 0.45rem;
  border-radius: 7px;
  border: 1px solid #d4def0;
  background: #f7f9fe;
  color: #4f6da4;
  padding: 0.38rem 0.55rem;
  font-size: 0.63rem;
  font-weight: 700;
}

.export-actions {
  margin-top: 0.34rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.24rem;
}

.export-btn {
  margin-top: 0;
}

.palette-export-status {
  margin-top: 0.28rem;
  color: #7a879b;
  font-size: 0.6rem;
}

.contrast-live-panel {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 0.52rem;
  min-height: 282px;
  transition: background-color 120ms ease;
}

.contrast-live-top {
  border: 1px solid rgba(255, 255, 255, 0.55);
  background: rgba(255, 255, 255, 0.55);
  border-radius: 9px;
  padding: 0.44rem;
}

.contrast-live-controls {
  margin-top: 0.38rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.34rem;
  align-items: end;
}

.contrast-live-picker {
  display: flex;
  flex-direction: column;
  gap: 0.14rem;
  color: #5a677c;
  font-size: 0.58rem;
  font-weight: 700;
}

.contrast-live-picker input[type="color"] {
  width: 100%;
  height: 32px;
  border-radius: 7px;
  border: 1px solid rgba(15, 23, 42, 0.16);
  background: #ffffff;
}

input[type="color"] {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  border: 1px solid #dce4f1;
  padding: 1px;
  background: #ffffff;
  cursor: pointer;
}

.contrast-ratio-badge {
  margin: 0;
  align-self: end;
  justify-self: stretch;
  border: 1px solid rgba(15, 23, 42, 0.2);
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.6);
  padding: 0.44rem 0.46rem;
  color: #4f6da4;
  font-size: 0.66rem;
  font-weight: 800;
  text-align: center;
}

.contrast-recommendation {
  margin: 0.3rem 0 0;
  color: #4b5563;
  font-size: 0.6rem;
  font-weight: 600;
}

.contrast-wcag {
  margin: 0.14rem 0 0;
  color: #60708a;
  font-size: 0.58rem;
  font-weight: 600;
}

.contrast-live-sample {
  border: 1px solid rgba(15, 23, 42, 0.14);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  padding: 0.6rem;
  display: grid;
  align-content: start;
  gap: 0.14rem;
}

.contrast-live-sample p {
  margin: 0;
  line-height: 1.08;
  letter-spacing: -0.012em;
}

.sample-xl {
  font-size: clamp(1.35rem, 2.7vw, 1.8rem);
  font-weight: 800;
  text-transform: uppercase;
}

.sample-lg {
  font-size: clamp(1rem, 1.7vw, 1.2rem);
  font-weight: 700;
}

.sample-md {
  font-size: 0.86rem;
  font-weight: 600;
}

.sample-sm {
  font-size: 0.72rem;
  font-weight: 600;
}

.sample-xs {
  font-size: 0.62rem;
  opacity: 0.9;
}

button:focus,
input:focus,
select:focus {
  outline: 2px solid rgba(59, 130, 246, 0.3);
  outline-offset: 1px;
}

@media (max-width: 520px) {
  .site-shell {
    width: min(97vw, 470px);
    padding: 0.72rem 0 1.55rem;
  }

  .hero-sub {
    margin-top: 0.24rem;
    font-size: 0.8rem;
  }

  .quick-form {
    margin-top: 0.72rem;
  }

  .quick-input-row {
    gap: 0.34rem;
    padding: 0.36rem 0.4rem;
  }

  #quick-input {
    font-size: 0.72rem;
    padding: 0.4rem 0.15rem;
  }

  .quick-input-row button {
    font-size: 0.68rem;
    padding: 0.46rem 0.7rem;
  }

  .quick-result,
  .fx-status {
    margin-top: 0.3rem;
    font-size: 0.69rem;
  }

  .fx-trust {
    font-size: 0.61rem;
  }

  .converter-section {
    margin-top: 0.82rem;
  }

  .converter-section h2 {
    font-size: clamp(1.04rem, 7vw, 1.9rem);
  }

  .converter-sub {
    font-size: 0.72rem;
  }

  .converter-layout {
    grid-template-columns: minmax(0, 1fr) minmax(148px, 34%);
    gap: 0.4rem;
  }

  .converter-card {
    padding: 0.52rem;
  }

  .field-grid {
    gap: 0.38rem;
  }

  .split-input {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    gap: 0.24rem;
  }

  #main-value,
  #converted-value {
    font-size: 1rem;
  }

  .split-input select {
    font-size: 0.62rem;
    padding: 0.46rem 0.48rem;
  }

  .formula-line {
    margin-top: 0.4rem;
    font-size: 0.59rem;
    padding: 0.18rem 0.5rem;
  }

  .action-row {
    margin-top: 0.46rem;
    gap: 0.28rem;
  }

  .in-card-info-grid {
    margin-top: 0.46rem;
    grid-template-columns: 1fr;
    gap: 0.34rem;
  }

  .inline-info-pane {
    padding: 0.42rem;
  }

  .primary-btn {
    font-size: 0.66rem;
    padding: 0.5rem 0.64rem;
  }

  .icon-btn {
    width: 32px;
    height: 32px;
    font-size: 0.79rem;
  }

  .history-card {
    padding: 0.46rem;
  }

  .loan-card {
    padding: 0.48rem;
  }

  .tip-card {
    padding: 0.54rem;
  }

  .tip-card p {
    font-size: 0.65rem;
  }

  .card-head h3,
  .tip-card h3,
  .info-card h3,
  .design-label h3 {
    font-size: 0.74rem;
  }

  .info-grid {
    gap: 0.44rem;
  }

  .info-card {
    padding: 0.48rem;
  }

  .ref-table th,
  .ref-table td {
    font-size: 0.62rem;
    padding: 0.2rem 0;
  }

  .utility-grid {
    gap: 0.44rem;
  }

  .batch-input {
    min-height: 70px;
    font-size: 0.66rem;
  }

  .batch-output {
    min-height: 52px;
    font-size: 0.61rem;
    padding: 0.38rem;
  }

  .design-section {
    margin-top: 1.28rem;
  }

  .design-sub {
    font-size: 0.7rem;
  }

  .design-grid-top {
    gap: 0.44rem;
  }

  .panel {
    padding: 0.52rem;
  }

  .palette-row {
    gap: 0.32rem;
    padding: 0.28rem 0.34rem;
  }

  .palette-name {
    font-size: 0.62rem;
  }

  .palette-note,
  .palette-role {
    font-size: 0.53rem;
  }

  .export-actions {
    gap: 0.2rem;
  }

  .subtle-btn {
    font-size: 0.61rem;
    padding: 0.34rem 0.48rem;
  }

  .contrast-live-controls {
    grid-template-columns: 1fr 1fr;
    gap: 0.26rem;
  }

  .contrast-ratio-badge {
    grid-column: 1 / -1;
  }

  .contrast-recommendation,
  .contrast-wcag {
    font-size: 0.56rem;
  }

  .sample-xl {
    font-size: clamp(1.16rem, 4.3vw, 1.58rem);
  }
}

@media (max-width: 430px) {
  .site-shell {
    width: min(96vw, 430px);
    padding-top: 0.7rem;
  }

  .hero h1 {
    font-size: clamp(1.32rem, 6.8vw, 1.7rem);
  }

  .converter-layout,
  .info-grid,
  .utility-grid,
  .right-column {
    grid-template-columns: 1fr;
  }

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

  .swap-btn {
    justify-self: center;
    transform: rotate(90deg);
  }

  .action-row {
    grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
  }

  .in-card-info-grid {
    grid-template-columns: 1fr;
  }

  .design-grid-top {
    grid-template-columns: 1fr;
  }

  .palette-controls {
    grid-template-columns: 1fr;
  }

  .palette-control-wide {
    grid-column: auto;
  }

  .export-actions {
    grid-template-columns: 1fr;
  }

  .contrast-live-controls {
    grid-template-columns: 1fr;
  }
}