:root {
  color-scheme: dark;
  --background: #0d1117;
  --panel: #151c26;
  --border: #303c4b;
  --text: #edf3f9;
  --muted: #a3b3c5;
  --accent: #67e8c1;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--background); color: var(--text); line-height: 1.65; }
button, input { font: inherit; }
button, a, input { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
code, input, dd, .byte-cell strong, .examples button { font-family: Consolas, "SFMono-Regular", monospace; }
code { color: #dbe8f8; overflow-wrap: anywhere; }
.page { width: min(100% - 48px, 980px); margin: 0 auto; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 90px; border-bottom: 1px solid var(--border); }
.back-link { font-size: 14px; }
.back-link span { margin-right: 7px; }
.site-name { color: var(--muted); font-size: 13px; }
main { padding: 58px 0 46px; }
.eyebrow { color: var(--accent); font-size: 11px; letter-spacing: .15em; font-weight: 650; }
h1 { margin: 12px 0; font-size: clamp(32px, 6vw, 49px); line-height: 1.25; letter-spacing: -.04em; }
h1 span { color: var(--accent); }
.lead { color: var(--muted); margin: 15px 0 34px; font-size: 16px; }
h2 { margin: 0; font-size: 13px; font-weight: 650; letter-spacing: .025em; }
.input-panel { background: var(--panel); border: 1px solid var(--border); border-radius: 15px; padding: 26px; }
.section-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 25px; }
.local-badge { border: 1px solid #315749; border-radius: 20px; padding: 2px 9px; font-size: 11px; color: var(--accent); }
label { display: block; font-size: 14px; margin-bottom: 9px; }
.input-row { display: flex; gap: 12px; }
input { min-width: 0; width: 100%; color: var(--text); background: #0d131c; border: 1px solid #506074; border-radius: 8px; padding: 12px 15px; font-size: 21px; letter-spacing: .06em; }
input[aria-invalid="true"] { border-color: #ff9292; }
.primary-button { flex-shrink: 0; border: 1px solid var(--accent); border-radius: 8px; background: var(--accent); color: #09271e; font-size: 14px; font-weight: 700; padding: 12px 18px; }
.primary-button:hover { background: #96f2d6; }
.primary-button span { margin-left: 8px; }
.hint { color: var(--muted); font-size: 12px; margin: 12px 0 0; }
.error { color: #ffabab; font-size: 13px; margin: 8px 0 0; }
.error:empty { display: none; }
.examples { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; border-top: 1px solid var(--border); margin-top: 23px; padding-top: 17px; }
.examples > span { font-size: 12px; color: var(--muted); margin-right: 4px; }
.examples button { color: #c8d7e9; background: #1c2634; border: 1px solid #425168; border-radius: 6px; font-size: 12px; min-height: 36px; padding: 6px 10px; }
.examples button:hover { background: #2b3a4d; }
.results { margin-top: 36px; }
.byte-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 18px; }
.byte-cell { border: 1px solid var(--border); border-radius: 9px; text-align: center; padding: 13px 8px; background: #101721; }
.byte-cell span { display: block; font-size: 11px; color: var(--muted); }
.byte-cell strong { display: block; font-weight: 500; font-size: 28px; line-height: 1.5; }
.address-direction { display: flex; justify-content: space-between; color: var(--muted); font-size: 11px; margin: 6px 2px 22px; }
.address-direction span:nth-child(2) { flex: 1; margin: 0 12px; text-align: right; position: relative; }
.address-direction span:nth-child(2)::before { content: ""; display: block; position: absolute; left: 0; right: 9px; top: 50%; height: 1px; background: var(--border); }
.result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.result-card { border: 1px solid var(--border); border-top: 3px solid var(--accent); border-radius: 10px; padding: 24px; background: var(--panel); min-width: 0; }
.big-endian { border-top-color: #8cafff; }
.card-heading { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
h3 { font-size: 20px; margin: 0; }
.card-heading span { color: var(--muted); font-size: 12px; }
.explanation { font-size: 13px; color: var(--muted); margin: 4px 0 24px; }
dl { margin: 0; }
dl > div + div { margin-top: 19px; }
dt { color: var(--muted); font-size: 12px; }
dd { margin: 2px 0 0; font-size: clamp(22px, 3.2vw, 29px); letter-spacing: -.025em; overflow-wrap: anywhere; font-variant-numeric: tabular-nums; }
.hex-row { padding-top: 17px; border-top: 1px solid var(--border); }
.hex-row dd { font-size: 19px; }
.little-endian .hex-row dd { color: var(--accent); }
.big-endian .hex-row dd { color: #a7c2ff; }
.reading-note { margin-top: 31px; border-left: 2px solid #415569; padding-left: 19px; }
.reading-note h2 { font-size: 14px; }
.reading-note p { color: var(--muted); font-size: 13px; margin: 9px 0 0; line-height: 1.85; }
footer { color: var(--muted); padding: 24px 0 35px; border-top: 1px solid var(--border); font-size: 11px; }

@media (max-width: 600px) {
  .page { width: min(100% - 32px, 980px); }
  .topbar { min-height: 72px; }
  .site-name { font-size: 11px; }
  main { padding-top: 36px; }
  .lead { font-size: 14px; }
  .input-panel, .result-card { padding: 19px; }
  .input-row { flex-direction: column; }
  input { font-size: 20px; }
  .primary-button { min-height: 46px; }
  .result-grid { grid-template-columns: 1fr; }
  dd { font-size: 28px; }
  .byte-strip { gap: 7px; }
  .byte-cell strong { font-size: 25px; }
  footer { line-height: 1.9; }
}