:root { --bg: #ffffff; --fg: #1d1d1f; --muted: #5f6368; --line: #d9d9de; --card: #f6f6f9; --accent: #2f5bd3; --accent-fg: #ffffff; --warn: #a33a00; --dot: #c9c9d1; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #18181b; --fg: #f2f2f5; --muted: #a1a1aa; --line: #3f3f46; --card: #222226; --accent: #7aa2ff; --accent-fg: #0b0b0f; --warn: #ffb07a; --dot: #52525b; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 system-ui, "Noto Sans KR", sans-serif; }
header { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .5rem 1rem; max-width: 44rem; margin: 0 auto; padding: .75rem 1rem; border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; color: var(--fg); text-decoration: none; }
nav { display: flex; gap: 1rem; align-items: center; }
nav a { color: var(--accent); }
main { max-width: 44rem; margin: 0 auto; padding: 1.5rem 1rem 3rem; }
h1 { font-size: 1.5rem; margin: 0 0 1rem; }
h3 { margin: 0; font-size: 1.15rem; }
.lead { font-size: 1.05rem; }
.note, .hint, .meta { color: var(--muted); font-size: .9rem; }
.meta { margin: .1rem 0 .5rem; }
.warn { color: var(--warn); }
button, a.btn { font: inherit; padding: .55rem 1.2rem; border-radius: .5rem; border: 1px solid var(--line); background: transparent; color: var(--fg); cursor: pointer; text-decoration: none; display: inline-block; }
button.primary, a.btn { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
button:focus-visible, a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.cards { display: grid; gap: 1rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: .75rem; padding: 1rem; overflow-wrap: anywhere; }
.axes { width: 100%; border-collapse: collapse; font-size: .85rem; margin-top: .5rem; }
.axes th, .axes td { text-align: left; padding: .3rem .25rem; border-top: 1px solid var(--line); vertical-align: middle; }
.axes thead th { color: var(--muted); font-weight: 500; border-top: 0; }
.gauge { display: inline-flex; align-items: center; gap: .35rem; }
.gl { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
.dots { display: inline-flex; gap: 3px; }
.dot { width: .6rem; height: .6rem; border-radius: 50%; background: var(--dot); }
.dot.on { background: var(--accent); }
.gn { color: var(--muted); font-size: .75rem; min-width: 1.8rem; }
.approx { margin-left: .2rem; color: var(--muted); }
@media (max-width: 30rem) {
  .axes thead { display: none; }
  .axes tr { display: grid; grid-template-columns: 5rem 1fr; border-top: 1px solid var(--line); padding: .3rem 0; }
  .axes th[scope="row"], .axes td { border: 0; padding: .1rem 0; }
  .axes th[scope="row"] { grid-row: span 3; }
}
h2 { font-size: 1.15rem; margin: 1.5rem 0 .5rem; }
.presets { display: grid; gap: .6rem; grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr)); }
.preset { display: flex; flex-direction: column; gap: .25rem; text-align: left; background: var(--card); }
.preset:hover { border-color: var(--accent); }
fieldset { border: 1px solid var(--line); border-radius: .6rem; margin: .8rem 0; padding: .5rem .8rem .8rem; }
legend { font-weight: 600; padding: 0 .3rem; }
.row { display: grid; grid-template-columns: 8.5rem 1fr 5.5rem; align-items: center; gap: .6rem; margin: .35rem 0; }
.row input[type="text"], .row input[type="number"] { grid-column: span 2; font: inherit; padding: .4rem .5rem; border: 1px solid var(--line); border-radius: .4rem; background: var(--bg); color: var(--fg); }
.row input[type="range"] { width: 100%; accent-color: var(--accent); }
output { color: var(--muted); font-size: .85rem; }
details { margin-top: .3rem; }
summary { cursor: pointer; color: var(--accent); }
ul.warn { padding-left: 1.2rem; }
@media (max-width: 30rem) { .row { grid-template-columns: 1fr; gap: .15rem; } .row input[type="text"], .row input[type="number"] { grid-column: auto; } }