:root {
  --bg: #FAFAFA;
  --card: #FFFFFF;
  --text: #1A1A1A;
  --text-soft: #6B6B6B;
  --border: #E5E5E5;
  --positive: #16A34A;
  --negative: #DC2626;

  --radius-input: 8px;
  --radius-card: 12px;

  --pad-mobile: 16px;
  --pad-desktop: 24px;

  --font-stack: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

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

body {
  font-family: var(--font-stack);
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--card);
}
.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--pad-mobile);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.header-text { display: flex; flex-direction: column; gap: 4px; }
.title {
  margin: 0;
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.subtitle {
  margin: 0;
  font-size: 15px;
  color: var(--text-soft);
}
.currency-switch { align-self: flex-start; }
.currency-switch select {
  height: 44px;
  min-width: 96px;
  padding: 0 12px;
  font-size: 15px;
  font-family: var(--font-stack);
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  cursor: pointer;
}
.currency-switch select:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 2px;
}

@media (min-width: 768px) {
  .header-inner {
    padding: var(--pad-desktop);
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
  }
  .currency-switch { align-self: auto; }
}

/* Layout */
.layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--pad-mobile);
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 768px) {
  .layout {
    padding: var(--pad-desktop);
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: start;
  }
}

/* Inputs column */
.inputs-col { display: flex; flex-direction: column; gap: 16px; }

.block {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: var(--pad-mobile);
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
@media (min-width: 768px) {
  .block { padding: var(--pad-desktop); gap: 16px; }
}
.block-title {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-soft);
  padding: 0;
  margin: 0 0 4px;
}

.field { display: flex; flex-direction: column; gap: 6px; }
.field label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
}
.field input {
  height: 44px;
  padding: 0 12px;
  font-size: 15px;
  font-family: var(--font-stack);
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  width: 100%;
}
.field input:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 2px;
}
.hint {
  font-size: 12px;
  color: var(--text-soft);
  line-height: 1.4;
}

.reset-btn {
  align-self: flex-start;
  height: 44px;
  padding: 0 16px;
  font-size: 14px;
  font-family: var(--font-stack);
  font-weight: 500;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  cursor: pointer;
}
.reset-btn:hover { background: #F4F4F4; }
.reset-btn:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 2px;
}

/* Results column */
.results-col { display: flex; flex-direction: column; gap: 16px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: var(--pad-mobile);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
@media (min-width: 768px) {
  .card { padding: var(--pad-desktop); }
}
.card-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.card-value {
  font-size: 24px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}
.card-value-hero { font-size: 36px; }
.card-foot {
  font-size: 12px;
  color: var(--text-soft);
}
.card-hero {
  border-color: var(--text);
}

/* Chart */
.chart-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: var(--pad-mobile);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
@media (min-width: 768px) {
  .chart-card { padding: var(--pad-desktop); }
}
.chart-head { display: flex; flex-direction: column; gap: 4px; }
.chart-title {
  font-size: 15px;
  font-weight: 600;
  margin: 0;
  color: var(--text);
}
.chart-sub {
  font-size: 12px;
  color: var(--text-soft);
  margin: 0;
}
.chart-wrap {
  position: relative;
  width: 100%;
  height: 240px;
}
@media (min-width: 768px) {
  .chart-wrap { height: 280px; }
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--card);
  margin-top: 8px;
}
.site-footer p {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--pad-mobile);
  font-size: 12px;
  color: var(--text-soft);
  text-align: center;
}
@media (min-width: 768px) {
  .site-footer p { padding: var(--pad-desktop); }
}