:root {
  --bg: #0f1216;
  --card: #171b21;
  --card-2: #1e232b;
  --border: #2a313b;
  --text: #e6e9ee;
  --muted: #8b94a3;
  --accent: #4f9cf9;
  --accent-2: #3b82f6;
  --code: #6ee7b7;
  --error: #f87171;
  --today: #f5c451;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f2f4f7; --card: #ffffff; --card-2: #f6f8fb; --border: #dde3ea;
    --text: #121821; --muted: #5b6472; --accent: #2563eb; --accent-2: #1d4ed8;
    --code: #0f766e; --error: #dc2626; --today: #b7791f;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 24px;
  background: var(--bg); color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}
.card {
  width: 100%; max-width: 440px; background: var(--card);
  border: 1px solid var(--border); border-radius: 16px; padding: 28px;
  box-shadow: 0 12px 40px rgba(0,0,0,.25);
}
h1 { margin: 0 0 4px; font-size: 22px; }
.sub { margin: 0 0 22px; color: var(--muted); font-size: 14px; }

.field { display: block; position: relative; margin-bottom: 16px; }
.field-label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
select, input {
  width: 100%; padding: 12px 14px; font-size: 16px; color: var(--text);
  background: var(--card-2); border: 1px solid var(--border); border-radius: 10px;
  outline: none; transition: border-color .15s;
}
select:focus, input:focus { border-color: var(--accent); }
input#vin { letter-spacing: .35em; font-variant-numeric: tabular-nums; }
.counter { position: absolute; right: 12px; bottom: 12px; font-size: 12px; color: var(--muted); }

button {
  width: 100%; padding: 13px; margin-top: 4px; font-size: 16px; font-weight: 600;
  color: #fff; background: var(--accent-2); border: 0; border-radius: 10px; cursor: pointer;
  transition: filter .15s, opacity .15s;
}
button:hover { filter: brightness(1.08); }
button:disabled { opacity: .6; cursor: default; }

.error { color: var(--error); font-size: 14px; min-height: 1.2em; margin: 10px 0 0; }

.result { margin-top: 22px; border-top: 1px solid var(--border); padding-top: 18px; }
.result-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 12px; }
.result-head span:first-child { font-weight: 600; }
.muted { color: var(--muted); font-size: 13px; }

.codes { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.codes li {
  display: flex; justify-content: space-between; align-items: center;
  background: var(--card-2); border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 14px;
}
.codes li.today { border-color: var(--today); }
.codes .date { color: var(--muted); font-size: 13px; }
.codes .today-tag { color: var(--today); font-size: 11px; margin-left: 8px; text-transform: uppercase; letter-spacing: .05em; }
.codes .code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 17px; color: var(--code); letter-spacing: .06em; cursor: pointer;
  user-select: all;
}
.codes .code:active { opacity: .6; }

.foot { margin-top: 20px; color: var(--muted); font-size: 12px; line-height: 1.5; }