:root {
  --bg: #f6f7f9; --fg: #1d2129; --muted: #5b6270; --card: #ffffff; --line: #dfe3ea;
  --accent: #2563eb; --good: #15803d; --bad: #b42318; --stage: #15171c;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111317; --fg: #e8eaee; --muted: #a2a9b6; --card: #1a1d23; --line: #2c313a; --accent: #6ea0ff; --good: #4ade80; --bad: #f87171; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.65 "Pretendard", "Apple SD Gothic Neo", "Noto Sans KR", system-ui, sans-serif; }
main { max-width: 1080px; margin: 0 auto; padding: 24px 16px 64px; }
header { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
h1 { font-size: 1.6rem; margin: 0 0 4px; line-height: 1.3; }
h2 { font-size: 1.25rem; margin: 36px 0 10px; }
h3 { font-size: 1.05rem; margin: 18px 0 6px; }
.lang { border: 1px solid var(--line); border-radius: 8px; padding: 6px 12px; text-decoration: none; color: var(--fg); background: var(--card); white-space: nowrap; }
.sub { color: var(--muted); margin: 0; }
.summary { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 10px; padding: 14px 18px; margin-top: 18px; }
.summary ul { margin: 6px 0 0; padding-left: 20px; }
.diagram { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px; overflow-x: auto; }
.tabs { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.tab { border: 2px solid var(--c, var(--line)); background: var(--card); color: var(--fg); border-radius: 999px; padding: 5px 14px; cursor: pointer; font: inherit; }
.tab.on { background: var(--c, var(--accent)); color: #fff; }
#stage { position: relative; height: min(64vh, 620px); background: var(--stage); border-radius: 12px; overflow: hidden; }
#stage canvas, .splat-holder { position: absolute; inset: 0; width: 100%; height: 100%; }
.controls { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 8px 0; }
.controls button { border: 1px solid var(--line); background: var(--card); color: var(--fg); border-radius: 8px; padding: 5px 12px; cursor: pointer; font: inherit; }
.controls button:disabled { opacity: .45; cursor: default; }
#viewer-status { color: var(--muted); font-size: .9rem; margin-left: auto; }
.method-note { background: var(--card); border: 1px solid var(--line); border-left: 5px solid var(--c, var(--line)); border-radius: 10px; padding: 10px 16px; margin-top: 8px; }
.method { background: var(--card); border: 1px solid var(--line); border-left: 6px solid var(--c, var(--line)); border-radius: 12px; padding: 4px 18px 14px; margin: 14px 0; }
.method h3 { color: var(--c); }
td.mname { font-weight: 600; border-left: 5px solid var(--c); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 22px; }
@media (max-width: 720px) { .grid2 { grid-template-columns: 1fr; } h1 { font-size: 1.3rem; } }
.pro li::marker { color: var(--good); }
.con li::marker { color: var(--bad); }
table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: 10px; overflow: hidden; font-size: .93rem; }
th, td { border-bottom: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: color-mix(in srgb, var(--accent) 10%, var(--card)); }
.table-wrap { overflow-x: auto; }
code { background: color-mix(in srgb, var(--muted) 15%, transparent); padding: 1px 5px; border-radius: 4px; font-size: .88em; }
.fail li { margin-bottom: 4px; }
footer { color: var(--muted); font-size: .85rem; margin-top: 40px; }
#stage { outline: 3px solid var(--stage-c, transparent); outline-offset: -3px; }