:root {
  color-scheme: light;
  --paper: #f5f7fa;
  --card: #fff;
  --surface: #f8fafb;
  --ink: #182b39;
  --muted: #697c8a;
  --line: #e5ebef;
  --accent: #087f75;
  --accent-soft: #eaf7f3;
  --shadow: 0 8px 32px #203a5010;
}
[data-theme="dark"] {
  color-scheme: dark;
  --paper: #101820;
  --card: #17232e;
  --surface: #1c2b37;
  --ink: #e8f0f5;
  --muted: #9caebc;
  --line: #2c3d4b;
  --accent: #6ddac0;
  --accent-soft: #173a36;
  --shadow: 0 8px 32px #0002;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; font-size: 14px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
button:disabled { cursor: wait; opacity: .6; }
button, a, input { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
button { transition: background .16s, border-color .16s, box-shadow .16s; }
.ambient { display: none; }
.site-header, main, footer { width: min(1080px, calc(100% - 64px)); margin-inline: auto; }
.site-header { height: 82px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; color: var(--ink); font-size: 21px; font-weight: 750; letter-spacing: .08em; }
.brand-mark { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 10px; background: var(--accent); color: var(--card); }
.brand-mark svg { width: 28px; fill: none; stroke: currentColor; stroke-width: 2.8; stroke-linecap: round; }
.header-actions { display: flex; align-items: center; gap: 20px; }
.live-pill { color: var(--muted); font-size: 12px; }
.icon-button { display: grid; place-items: center; width: 38px; height: 38px; padding: 0; border: 1px solid var(--line); border-radius: 11px; background: var(--card); }
.icon-button:hover { border-color: var(--accent); }
.icon-button svg { width: 18px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; }
.moon-icon, [data-theme="dark"] .sun-icon { display: none; }
[data-theme="dark"] .moon-icon { display: block; }
.hero { padding: 42px 0 30px; }
.eyebrow { margin: 0 0 10px; color: var(--muted); font-size: 10px; font-weight: 650; letter-spacing: .18em; }
.hero h1 { margin: 0; font-size: clamp(26px, 3.3vw, 38px); font-weight: 700; letter-spacing: -.055em; line-height: 1.4; }
.hero h1 em { color: var(--accent); font-style: normal; }
.hero-copy { margin: 10px 0 0; color: var(--muted); font-size: 14px; }
.converter-card { padding: 28px 32px 20px; background: var(--card); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow); }
.converter-heading, .market-heading, .popover-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
h2 { margin: 0; font-size: 18px; font-weight: 650; letter-spacing: -.02em; }
.converter-subtitle { margin: 4px 0 0; color: var(--muted); font-size: 12px; }
.refresh-button { display: flex; align-items: center; gap: 7px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 9px; color: var(--muted); background: var(--card); font-size: 12px; }
.refresh-button:hover { color: var(--accent); border-color: var(--accent); }
.refresh-button svg { width: 15px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.refresh-button.loading svg { animation: spin 1s linear infinite; }
.quick-picks { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 25px 0 22px; }
.quick-picks > span { color: var(--muted); font-size: 12px; margin-right: 4px; }
.quick-picks button { background: var(--surface); color: var(--muted); border: 1px solid transparent; border-radius: 7px; padding: 6px 12px; font-size: 11px; font-weight: 600; }
.quick-picks button:hover, .quick-picks button[aria-pressed="true"] { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 25%, transparent); color: var(--accent); }
.converter-grid { display: grid; grid-template-columns: minmax(0,1fr) 46px minmax(0,1fr); align-items: center; gap: 18px; }
.money-field { min-width: 0; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); padding: 19px 22px 17px; transition: border-color .15s, box-shadow .15s; }
.money-field:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 9%, transparent); }
.money-field > label { display: block; color: var(--muted); font-size: 12px; }
.amount-row { display: flex; flex-direction: column-reverse; align-items: stretch; }
.currency-trigger { display: grid; grid-template-columns: 32px auto 1fr 16px; align-items: center; gap: 9px; align-self: flex-start; border: 0; border-radius: 8px; padding: 5px 7px 5px 0; margin: 10px 0; background: transparent; text-align: left; }
.currency-trigger:hover { background: var(--line); }
.currency-trigger > span:nth-child(2) { display: flex; align-items: baseline; gap: 9px; }
.currency-trigger strong { font-size: 15px; font-weight: 700; }
.currency-trigger small { font-size: 12px; color: var(--muted); }
.currency-trigger svg { grid-column: 4; width: 14px; fill: none; stroke: var(--muted); stroke-width: 1.8; stroke-linecap: round; }
.currency-symbol { display: grid; place-items: center; width: 32px; height: 32px; flex-shrink: 0; border-radius: 50%; background: #edf1f5; color: #526b80; font-size: 14px; font-weight: 700; }
[data-currency-code="CNY"] { color: #bb524d; background: #fbeceb; }
[data-currency-code="HKD"] { color: #aa6741; background: #faf0e4; }
[data-currency-code="USD"] { color: #467955; background: #eaf3ec; }
[data-currency-code="EUR"] { color: #596ec1; background: #edf0fb; }
[data-currency-code="USDC"] { color: #357cc4; background: #eaf3fc; }
[data-currency-code="USDT"] { color: #258a74; background: #e7f5ef; }
[data-theme="dark"] .currency-symbol { background: var(--line); color: var(--ink); }
.amount-row input { min-width: 0; width: 100%; border: 0; padding: 4px 0 0; outline: 0; background: transparent; font-size: clamp(28px, 3.6vw, 42px); line-height: 1.25; letter-spacing: -.035em; font-weight: 600; font-variant-numeric: tabular-nums; }
.result-field { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 18%, var(--line)); }
.result-field input { color: var(--accent); }
.swap-button { width: 46px; height: 46px; border: 1px solid var(--line); border-radius: 50%; background: var(--card); display: grid; place-items: center; color: var(--accent); }
.swap-button:hover { background: var(--accent-soft); border-color: var(--accent); }
.swap-button svg { width: 21px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.rate-meta { display: flex; justify-content: space-between; align-items: center; gap: 18px; padding-top: 22px; }
.rate-line { display: flex; align-items: center; gap: 10px; min-width: 0; }
.rate-icon { font-size: 24px; color: var(--accent); }
.rate-line > div > span { color: var(--muted); font-size: 11px; }
.rate-line strong { display: block; font-weight: 600; font-size: 13px; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.status-line { display: flex; align-items: center; gap: 7px; font-size: 11px; color: var(--muted); }
.status-dot { width: 6px; height: 6px; flex-shrink: 0; border-radius: 50%; background: var(--accent); }
.status-dot.loading { animation: pulse 1.3s infinite; }
.status-dot.error { background: #d36f42; }
.input-hint { margin: 18px 0 0; padding-top: 13px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }
.advanced-card { margin-top: 20px; padding: 24px 28px; border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--line)); border-radius: 16px; background: var(--card); box-shadow: var(--shadow); }
.advanced-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; }
.advanced-heading h2 { font-size: 17px; }
.advanced-heading p { margin: 4px 0 0; color: var(--muted); font-size: 11px; }
.advanced-eyebrow { color: var(--accent) !important; font-weight: 700; letter-spacing: .08em; }
.advanced-card[hidden] { display: none; }
.on-demand-route .converter-card,
.on-demand-route .market-section { display: none; }
.advanced-close { display: grid; place-items: center; width: 32px; height: 32px; padding: 0; border: 1px solid var(--line); border-radius: 9px; background: var(--surface); color: var(--muted); font-size: 20px; line-height: 1; text-decoration: none; }
.advanced-form { display: grid; grid-template-columns: minmax(120px, .8fr) minmax(110px, 1fr) 36px minmax(110px, 1fr) auto; align-items: end; gap: 10px; margin-top: 20px; }
.advanced-form label > span,
.advanced-field > label { display: block; margin: 0 0 5px 2px; color: var(--muted); font-size: 10px; }
.advanced-form input { width: 100%; height: 42px; padding: 0 12px; border: 1px solid var(--line); border-radius: 9px; outline: 0; background: var(--surface); font-variant-numeric: tabular-nums; text-transform: uppercase; }
.advanced-form input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 9%, transparent); }
.advanced-currency-name { display: block; min-height: 16px; margin: 5px 2px 0; color: var(--muted); font-size: 10px; }
.fiat-combobox { position: relative; }
.fiat-dropdown[hidden] { display: none; }
.fiat-dropdown { position: absolute; z-index: 12; top: calc(100% + 6px); left: 0; right: 0; max-height: 240px; overflow-y: auto; padding: 5px; border: 1px solid var(--line); border-radius: 10px; background: var(--card); box-shadow: 0 14px 36px #0002; }
.fiat-option { display: flex; align-items: center; justify-content: space-between; width: 100%; padding: 9px 10px; border: 0; border-radius: 7px; background: transparent; color: var(--ink); text-align: left; }
.fiat-option:hover,
.fiat-option.active { background: var(--accent-soft); color: var(--accent); }
.fiat-option strong { font-size: 12px; }
.fiat-option span { color: var(--muted); font-size: 10px; }
.fiat-empty { padding: 12px 10px; color: var(--muted); font-size: 11px; text-align: center; }
.advanced-swap { width: 36px; height: 42px; padding: 0; border: 0; background: transparent; color: var(--accent); font-size: 19px; }
.advanced-submit { height: 42px; padding: 0 20px; border: 1px solid var(--accent); border-radius: 9px; background: var(--accent); color: white; font-size: 12px; font-weight: 650; }
.advanced-submit:hover { filter: brightness(.95); }
.advanced-result { margin-top: 16px; padding: 12px 14px; border-radius: 9px; background: var(--accent-soft); color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.advanced-result strong { color: var(--accent); font-size: 15px; }
.on-demand-route .advanced-card { margin-bottom: 40px; }
.market-section { padding: 34px 0 40px; }
.market-heading { margin-bottom: 16px; }
.market-heading h2 { font-size: 16px; }
.market-heading > p { margin: 0; font-size: 11px; color: var(--muted); }
.rate-cards { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
.rate-card { min-width: 0; padding: 18px 16px; background: var(--card); border: 1px solid var(--line); border-radius: 13px; }
.rate-card-top { display: flex; align-items: center; justify-content: space-between; gap: 5px; }
.rate-card-code { display: flex; align-items: center; gap: 8px; }
.rate-card-code strong { font-size: 12px; font-weight: 650; }
.rate-card-code small { display: block; font-size: 10px; color: var(--muted); }
.tag { color: var(--muted); font-size: 9px; white-space: nowrap; }
.rate-card > strong { display: block; margin: 20px 0 4px; font-size: clamp(19px, 2.1vw, 25px); font-weight: 650; letter-spacing: -.04em; font-variant-numeric: tabular-nums; white-space: nowrap; }
.rate-card > strong small { color: var(--muted); font-size: 10px; font-weight: 500; letter-spacing: 0; }
.rate-card > p { margin: 0; font-size: 10px; color: var(--muted); }
.skeleton { min-height: 145px; background: linear-gradient(110deg, var(--card) 25%, var(--surface) 45%, var(--card) 65%); background-size: 200% 100%; animation: shimmer 1.8s infinite; }
footer { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 22px 0 28px; border-top: 1px solid var(--line); color: var(--muted); font-size: 10px; }
footer > div { display: flex; gap: 12px; align-items: center; }
.footer-mark { color: var(--ink); font-size: 12px; font-weight: 650; }
footer p { margin: 0; }
.currency-popover[hidden] { display: none; }
.currency-popover { position: fixed; inset: 0; z-index: 20; display: grid; place-items: center; padding: 20px; }
.popover-backdrop { position: absolute; inset: 0; background: #0b182a70; backdrop-filter: blur(5px); }
.popover-panel { position: relative; width: min(480px, 100%); max-height: calc(100dvh - 40px); overflow-y: auto; background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 26px; box-shadow: 0 24px 80px #0003; }
.section-kicker { margin: 0 0 4px; font-size: 11px; color: var(--muted); }
.popover-header .icon-button { font-size: 24px; }
.currency-list { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 22px; }
.currency-option { display: grid; grid-template-columns: 32px 1fr auto; gap: 10px; align-items: center; text-align: left; border: 1px solid var(--line); border-radius: 11px; background: var(--surface); padding: 13px; }
.currency-option strong { display: block; font-size: 13px; }
.currency-option small, .currency-option > span:last-child { font-size: 10px; color: var(--muted); }
.currency-option:hover, .currency-option[aria-selected="true"] { border-color: var(--accent); background: var(--accent-soft); }
noscript { display: block; padding: 20px; text-align: center; }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 50% { opacity: .35; } }
@keyframes shimmer { to { background-position: -200% 0; } }
@media (max-width: 960px) {
  .rate-cards { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .converter-grid { gap: 12px; grid-template-columns: minmax(0,1fr) 40px minmax(0,1fr); }
  .swap-button { width: 40px; height: 40px; }
  .money-field { padding: 16px; }
}
@media (max-width: 640px) {
  .site-header, main, footer { width: calc(100% - 32px); }
  .site-header { height: 68px; }
  .header-actions { gap: 12px; }
  .live-pill { font-size: 10px; }
  .hero { padding: 28px 0 24px; }
  .hero h1 { font-size: 28px; }
  .hero-copy { font-size: 12px; }
  .converter-card { padding: 20px 16px 16px; border-radius: 16px; }
  .converter-subtitle { font-size: 11px; }
  .refresh-button { padding: 8px; }
  .quick-picks { gap: 6px; margin: 20px 0; }
  .quick-picks > span { width: 100%; }
  .quick-picks button { padding: 6px 8px; font-size: 10px; flex: 1; white-space: nowrap; }
  .converter-grid { grid-template-columns: minmax(0,1fr); gap: 0; }
  .money-field { padding: 15px 18px; }
  .amount-row input { font-size: 34px; }
  .currency-trigger { margin: 5px 0; }
  .swap-button { justify-self: end; margin: -12px 20px; z-index: 1; transform: rotate(90deg); box-shadow: 0 0 0 5px var(--card); }
  .rate-meta { flex-direction: column; align-items: flex-start; gap: 10px; padding-top: 18px; }
  .status-line { margin-left: 27px; }
  .input-hint { font-size: 10px; }
  .market-section { padding: 26px 0 30px; }
  .advanced-card { padding: 20px 16px; }
  .advanced-form { grid-template-columns: 1fr 36px 1fr; }
  .advanced-form label:first-child { grid-column: 1 / -1; }
  .advanced-submit { grid-column: 1 / -1; }
  .market-heading { align-items: flex-start; flex-direction: column; gap: 4px; }
  .rate-cards { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px; }
  .rate-card { padding: 15px 12px; }
  .rate-card > strong { font-size: 23px; }
  footer { flex-direction: column; align-items: flex-start; gap: 7px; }
  .popover-panel { padding: 20px 16px; }
  .currency-list { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}