:root {
  color-scheme: dark;
  --bg: #0d1118;
  --surface: #151b26;
  --surface-2: #1d2431;
  --surface-3: #262f3f;
  --line: rgb(255 255 255 / 0.07);
  --line-strong: rgb(255 255 255 / 0.14);
  --text: #eef1f7;
  --muted: #8a93a6;
  --amber: #f7a23b;
  --amber-soft: rgb(247 162 59 / 0.14);
  --mint: #3fd9c1;
  --mint-soft: rgb(63 217 193 / 0.12);
  --up: #3fd98b;
  --down: #ff6b6b;
  --focus: #7cb7ff;

  --sans: system-ui, -apple-system, "Segoe UI Variable Text", "Segoe UI", Ubuntu, Cantarell, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  --r-panel: 16px;
  --r-card: 12px;
  --r-chip: 8px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --fast: 140ms;
  --normal: 260ms;
}

@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;
    --bg: #fbf8f3;
    --surface: #ffffff;
    --surface-2: #f4efe7;
    --surface-3: #e9e2d6;
    --line: rgb(30 22 10 / 0.08);
    --line-strong: rgb(30 22 10 / 0.16);
    --text: #18140e;
    --muted: #6c6457;
    --amber: #9a5200;
    --amber-soft: rgb(247 147 26 / 0.14);
    --mint: #087566;
    --mint-soft: rgb(11 138 119 / 0.1);
    --up: #12804b;
    --down: #c63434;
    --focus: #1d6fe0;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: transparent;
  font: 14px/1.4 var(--sans);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  user-select: none;
  overflow: hidden;
}

button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
svg { display: block; }

:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

.panel {
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-panel);
  overflow: hidden;
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: 16px 18px 0;
  background:
    radial-gradient(120% 90% at 100% 0%, var(--amber-soft), transparent 60%),
    var(--surface);
  border-bottom: 1px solid var(--line);
}

.hero-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }

.coin-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 10px 6px 6px;
  margin-left: -6px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: none;
  transition: background var(--fast) var(--ease), border-color var(--fast) var(--ease);
}
.coin-btn:hover { background: var(--surface-2); border-color: var(--line); }
.coin-btn:active { transform: scale(0.98); }
.coin-text { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.15; }
.coin-text strong { font-size: 15px; font-weight: 650; }
.coin-text small { font: 600 11px/1.2 var(--mono); color: var(--muted); letter-spacing: 0.06em; }
.chev { width: 14px; height: 14px; fill: none; stroke: var(--muted); stroke-width: 1.8; stroke-linecap: round; }

.avatar {
  flex: none;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--surface-3) center / cover no-repeat;
  font: 700 12px var(--mono);
  color: var(--muted);
  overflow: hidden;
}
.avatar img { width: 100%; height: 100%; object-fit: cover; }
.avatar.sm { width: 24px; height: 24px; font-size: 10px; }

.rank {
  font: 600 11px var(--mono);
  color: var(--muted);
  padding: 3px 7px;
  border: 1px solid var(--line);
  border-radius: var(--r-chip);
}

.price {
  margin: 14px 0 2px;
  font: 600 38px/1.05 var(--mono);
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.price.flash { animation: flash 700ms var(--ease); }
@keyframes flash { from { opacity: 0.45; } to { opacity: 1; } }

.change { margin: 0; min-height: 20px; font: 600 13px var(--mono); color: var(--muted); }
.change.up { color: var(--up); }
.change.down { color: var(--down); }
.change span { color: var(--muted); font-weight: 500; }

.spark { width: calc(100% + 36px); height: 72px; margin: 6px -18px 0; color: var(--amber); }
.spark.up { color: var(--up); }
.spark.down { color: var(--down); }
.spark-line { fill: none; stroke: currentColor; stroke-width: 1.75; stroke-linejoin: round; vector-effect: non-scaling-stroke; }
.spark-label {
  position: absolute;
  right: 14px;
  bottom: 8px;
  font: 600 10px var(--mono);
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- converter ---------- */
.converter { position: relative; padding: 18px 18px 0; display: flex; flex-direction: column; }

.field {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 10px 10px 10px 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  transition: border-color var(--fast) var(--ease), box-shadow var(--fast) var(--ease);
}
.field-crypto { border-radius: var(--r-card) var(--r-card) 4px 4px; box-shadow: inset 3px 0 0 var(--amber); }
.field-fiat { margin-top: 4px; border-radius: 4px 4px var(--r-card) var(--r-card); box-shadow: inset 3px 0 0 var(--mint); }
.field:focus-within { border-color: var(--line-strong); outline: 2px solid var(--focus); outline-offset: -2px; }
.field-crypto:focus-within { box-shadow: inset 3px 0 0 var(--amber), 0 0 0 3px var(--amber-soft); }
.field-fiat:focus-within { box-shadow: inset 3px 0 0 var(--mint), 0 0 0 3px var(--mint-soft); }

.field-label {
  min-width: 52px;
  padding: 5px 8px;
  border-radius: var(--r-chip);
  font: 700 12px var(--mono);
  letter-spacing: 0.04em;
  text-align: center;
}
label.field-label { background: var(--amber-soft); color: var(--amber); }
select.field-label {
  appearance: none;
  border: 0;
  background: var(--mint-soft);
  color: var(--mint);
  text-transform: uppercase;
  cursor: pointer;
}
select.field-label option { color: var(--text); background: var(--surface); }

.field input {
  width: 100%;
  min-width: 0;
  border: 0;
  background: none;
  outline: none;
  font: 500 22px var(--mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  user-select: text;
}
.field input::placeholder { color: var(--muted); opacity: 0.7; }
.field input[aria-invalid="true"] { color: var(--down); }

.equals {
  position: absolute;
  left: 50%;
  top: calc(18px + 54px);
  translate: -50% -50%;
  z-index: 1;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--line-strong);
  padding: 0;
  color: var(--muted);
  cursor: pointer;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease), transform var(--fast) var(--ease);
}
.equals svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.equals:hover { color: var(--text); border-color: var(--text); }
.equals:active { transform: scale(0.9); }
.equals:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.swapped .equals svg { transform: rotate(180deg); }
.swapped .field-fiat { order: -1; margin-top: 0; border-radius: var(--r-card) var(--r-card) 4px 4px; }
.swapped .field-crypto { margin-top: 4px; border-radius: 4px 4px var(--r-card) var(--r-card); }

.icon-btn {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 0;
  border-radius: var(--r-chip);
  background: none;
  color: var(--muted);
  transition: background var(--fast) var(--ease), color var(--fast) var(--ease);
}
.icon-btn svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.icon-btn:hover { background: var(--surface-2); color: var(--text); }
.icon-btn:active { transform: scale(0.92); }
.copy.done { color: var(--up); }

.quick { display: flex; gap: 6px; margin-top: 12px; }
.quick button {
  flex: 1;
  padding: 7px 0;
  border: 1px dashed var(--line-strong);
  border-radius: var(--r-chip);
  background: none;
  font: 600 12px var(--mono);
  color: var(--muted);
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease), background var(--fast) var(--ease);
}
.quick button:hover { color: var(--mint); border-color: var(--mint); border-style: solid; background: var(--mint-soft); }

/* ---------- status ---------- */
.status {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px 10px 18px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
}
.status-text { flex: 1; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--muted); }
.dot.live { background: var(--up); box-shadow: 0 0 0 3px rgb(63 217 139 / 0.18); }
.dot.stale { background: var(--amber); }
.dot.error { background: var(--down); }
.spinning svg { animation: spin 800ms linear infinite; }
@keyframes spin { to { rotate: 360deg; } }

.text-btn {
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: var(--r-chip);
  background: none;
  font-size: 12px;
  color: var(--muted);
}
.text-btn:hover { color: var(--down); border-color: var(--down); }

/* ---------- picker ---------- */
.picker {
  position: absolute;
  inset: 0;
  width: auto;
  height: auto;
  max-width: none;
  max-height: none;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: var(--r-panel);
  display: none;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
}
.picker[open] { display: flex; animation: sheet var(--normal) var(--ease); }
.picker::backdrop { background: transparent; }
@keyframes sheet { from { opacity: 0; transform: translateY(12px); } }

.picker-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px;
  border-bottom: 1px solid var(--line);
}
.picker-head input {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-card);
  background: var(--surface);
  outline: none;
  user-select: text;
}
.picker-head input:focus { border-color: var(--amber); box-shadow: 0 0 0 3px var(--amber-soft); }
.picker-head input:focus-visible { outline: 2px solid var(--focus); outline-offset: 1px; }
.picker-close { padding: 0; border: 0; background: none; border-radius: 6px; }
.picker-close:hover kbd { color: var(--text); border-color: var(--line-strong); }
.picker-close:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
kbd { font: 600 10px var(--mono); color: var(--muted); padding: 3px 6px; border: 1px solid var(--line); border-radius: 6px; }

.coin-list { flex: 1; margin: 0; padding: 6px; list-style: none; overflow-y: auto; scrollbar-width: thin; }
.coin-list li {
  display: grid;
  grid-template-columns: 24px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--r-chip);
  cursor: pointer;
}
.coin-list li[aria-selected="true"] { background: var(--surface-2); }
.coin-list li.current .sym { color: var(--amber); }
.coin-list .names { min-width: 0; display: flex; gap: 8px; align-items: baseline; }
.coin-list .sym { font: 700 12px var(--mono); }
.coin-list .name { color: var(--muted); font-size: 13px; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.coin-list .px { text-align: right; font: 500 12px var(--mono); font-variant-numeric: tabular-nums; }
.coin-list .px small { display: block; font-size: 10px; color: var(--muted); }
.coin-list .px small.up { color: var(--up); }
.coin-list .px small.down { color: var(--down); }
.coin-list .empty { display: block; padding: 24px; text-align: center; color: var(--muted); cursor: default; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}