:root {
  --bg: #f2f3f6;
  --surface: #ffffff;
  --ink: #151922;
  --muted: #5f6778;
  --line: #dcdfe6;
  --soft: #eceef3;
  --accent: #2c4bd6;
  --hot: #d23f28;
  --bar: #c3cadb;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "IBM Plex Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1116; --surface: #161920; --ink: #e6e8ee; --muted: #979eac; --line: #2a2e38;
    --soft: #1e222b; --accent: #8198ff; --hot: #ff7b61; --bar: #3a4155; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f1116; --surface: #161920; --ink: #e6e8ee; --muted: #979eac; --line: #2a2e38;
  --soft: #1e222b; --accent: #8198ff; --hot: #ff7b61; --bar: #3a4155; color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.6 var(--sans); }
code { font-family: var(--mono); }
button { font: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.wrap { max-width: 660px; margin: 0 auto; padding-inline: 16px; padding-block: 40px 72px; }

header h1 { margin: 0; font: 700 1.9rem/1.2 var(--sans); letter-spacing: -0.02em; text-wrap: balance; }
header h1 span { color: var(--accent); }
.caret { display: inline-block; width: .5em; height: .95em; margin-left: .12em; vertical-align: -0.1em; background: var(--accent); animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
header p { margin: 6px 0 0; font: 13px var(--mono); color: var(--muted); }

.tabs { position: relative; display: flex; margin-top: 28px; border-bottom: 1px solid var(--line); overflow-x: auto; scrollbar-width: none; }
.tab { display: flex; align-items: center; gap: 8px; padding: 9px 14px; margin-bottom: -1px; white-space: nowrap;
  font: 500 13px var(--mono); color: var(--muted); background: none; border: 1px solid transparent; border-bottom: 0; border-radius: 7px 7px 0 0; }
.tab:hover { color: var(--ink); }
.tab[aria-selected="true"] { background: var(--surface); border-color: var(--line); color: var(--ink); }
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--dot); box-shadow: inset 0 0 0 1px rgb(0 0 0 / .15); }
.tab.done::after { content: "✓"; color: var(--accent); font-weight: 600; }

.pane { background: var(--surface); border: 1px solid var(--line); border-top: 0; border-radius: 0 0 10px 10px; padding: 18px 18px 8px; }
.meta { margin: 0 0 12px; font: 12px var(--mono); color: var(--muted); font-variant-numeric: tabular-nums; }

form { display: flex; gap: 8px; }
.field { flex: 1; min-width: 0; display: flex; align-items: center; padding-left: 12px; background: var(--bg); border: 1px solid var(--line); border-radius: 8px; }
.field:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
.ps { font: 500 14px var(--mono); color: var(--accent); white-space: nowrap; user-select: none; }
#guess { flex: 1; min-width: 0; padding: 11px 8px; border: 0; background: transparent; color: var(--ink); font: 15px var(--mono); outline: none; }
#guess::placeholder { color: var(--muted); opacity: .7; }
.icon { display: grid; place-items: center; width: 36px; height: 36px; flex: none; background: none; border: 0; border-radius: 6px; color: var(--muted); }
.icon:hover { color: var(--ink); background: var(--soft); }
.icon svg { width: 19px; height: 19px; }
.icon.armed { color: var(--hot); }
.go { flex: none; padding: 0 18px; border: 0; border-radius: 8px; background: var(--ink); color: var(--surface); font-weight: 700; }

.msg { min-height: 1.5em; margin: 8px 0 4px; font-size: 13px; color: var(--muted); }
.msg.err { color: var(--hot); }
.msg code { color: var(--ink); }

.result { margin-block: 8px 18px; padding: 18px; border: 1px solid var(--accent); border-radius: 10px; background: color-mix(in srgb, var(--accent) 6%, var(--surface)); }
.result .kicker { margin: 0; font: 600 12px var(--mono); color: var(--accent); }
.result .answer { margin: 4px 0 0; font: 600 1.8rem/1.25 var(--mono); word-break: break-all; }
.result .desc { margin: 2px 0 10px; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 16px; padding: 0; list-style: none; }
.tags li { padding: 1px 7px; font: 12px var(--mono); color: var(--muted); background: var(--surface); border: 1px solid var(--line); border-radius: 4px; }
.result h3 { margin: 0 0 6px; font: 500 12px var(--mono); color: var(--muted); }
.near { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 2px 20px; margin: 0; padding: 0; list-style: none; font: 13px var(--mono); font-variant-numeric: tabular-nums; }
.near li { display: flex; gap: 8px; }
.near b { width: 1.6em; font-weight: 400; color: var(--muted); text-align: right; }
.near code { flex: 1; min-width: 0; overflow-wrap: anywhere; }
.near span { color: var(--muted); }
.result .next { margin: 14px 0 0; font-size: 12px; color: var(--muted); }

.board { font-variant-numeric: tabular-nums; }
.row { display: grid; grid-template-columns: 2.2rem 1fr 4.4rem 6rem; gap: 10px; align-items: center; padding: 9px 0; border-top: 1px solid var(--soft); }
.row.head { padding-block: 6px; border: 0; font: 12px var(--mono); color: var(--muted); }
.row.head span:nth-child(n+3) { text-align: right; }
.row.latest { margin-inline: -10px; padding-inline: 10px; background: var(--soft); border-radius: 7px; border: 0; margin-bottom: 6px; }
.n { font: 12px var(--mono); color: var(--muted); }
.id { min-width: 0; }
.id code { font-size: 15px; font-weight: 500; overflow-wrap: anywhere; }
.id small { display: block; font-size: 12px; line-height: 1.4; color: var(--muted); }
.chip { margin-left: 6px; padding: 0 5px; font: normal 11px var(--sans); color: var(--accent); border: 1px solid currentColor; border-radius: 4px; vertical-align: 2px; }
.sc { text-align: right; font: 14px var(--mono); }
.rk { text-align: right; font: 12px var(--mono); color: var(--muted); }
.rk i { position: relative; display: block; height: 4px; margin-top: 5px; overflow: hidden; background: var(--soft); border-radius: 2px; }
.latest .rk i { background: var(--surface); }
.rk i::after { content: ""; position: absolute; inset: 0 auto 0 0; width: var(--w); background: var(--bar); }
.hot .rk { color: var(--hot); }
.hot .rk i::after { background: var(--hot); }
.win code, .win .rk, .win .sc { color: var(--accent); font-weight: 600; }
.win .rk i::after { background: var(--accent); }
.flash { animation: flash .9s ease-out; }
@keyframes flash { from { background: color-mix(in srgb, var(--accent) 22%, transparent); } }
.result.pop { animation: pop .6s cubic-bezier(.2, 1.6, .4, 1); }
@keyframes pop { from { transform: scale(.94); opacity: 0; } }
.confetti { position: fixed; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 10; }
.empty { padding: 28px 0 22px; text-align: center; color: var(--muted); font-size: 14px; }

.help { margin-top: 44px; }
.help h2 { margin: 0 0 6px; font-size: 1.1rem; }
details { border-bottom: 1px solid var(--line); }
summary { padding: 11px 0; font-weight: 500; cursor: pointer; }
details > div { padding-bottom: 14px; color: var(--muted); font-size: 14px; }
details ol, details ul { margin: 0; padding-left: 1.3em; }
details p { margin: 0 0 8px; }
details code { color: var(--ink); font-size: 13px; }

@media (max-width: 480px) {
  header h1 { font-size: 1.6rem; }
  .pane { padding-inline: 12px; }
  .row { grid-template-columns: 1.6rem 1fr 3.9rem 4.6rem; gap: 8px; }
  .row.latest { margin-inline: -6px; padding-inline: 6px; }
  .go { padding: 0 14px; }
  .icon { width: 32px; }
}
@media (prefers-reduced-motion: reduce) {
  .caret, .flash { animation: none; }
}