:root {
  --paddy: #3a6b32;
  --vermilion: #b43a2a;
  --paper: #f6ecd4;
  --ink: #2a2418;
  --mute: #8a7a62;
  --display: "Ma Shan Zheng", "Noto Serif SC", cursive;
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 58px; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); font-size: 16px; line-height: 1.7; }
.wax { pointer-events: none; position: fixed; inset: 0; z-index: 4; opacity: 0.12; background-image: url("images/texture.webp"); background-size: 260px auto; mix-blend-mode: multiply; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.app-link { color: var(--vermilion); text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; cursor: pointer; }
code { font-family: var(--mono); background: #ead9b0; padding: 0.05em 0.35em; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 10px; top: 10px; z-index: 80; background: var(--vermilion); color: #fff; padding: 8px; }
.seal-bar { position: sticky; top: 0; z-index: 50; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 0 18px; min-height: 58px; background: #fff8ea; border-bottom: 3px solid var(--vermilion); }
.mark { font-family: var(--display); font-size: 28px; }
.mark small { display: block; font-family: var(--mono); font-size: 10px; color: var(--paddy); letter-spacing: 0.16em; }
.seal-links { display: flex; flex-wrap: wrap; gap: 8px 14px; font-size: 14px; }
.seal-links a.is-active { color: var(--vermilion); }
.seal-links .live { background: var(--vermilion); color: #fff8ea; padding: 6px 12px; border-radius: 999px; font-weight: 700; }
.nav-toggle { display: none; background: transparent; color: var(--vermilion); border: 1px solid var(--vermilion); border-radius: 999px; padding: 6px 12px; }
.paddy { position: relative; }
.paddy > img { width: 100%; height: 78vh; object-fit: cover; }
.stamp { position: absolute; left: 6vw; bottom: 24px; width: min(500px, 90vw); background: rgba(246, 236, 212, 0.94); padding: 26px; border-radius: 8px 48px 8px 8px; box-shadow: 0 0 0 8px var(--vermilion); }
.kicker { font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; color: var(--paddy); margin: 0 0 8px; }
h1, h2, h3 { margin: 0 0 12px; line-height: 1.2; }
h1 { font-family: var(--display); font-size: clamp(30px, 4.6vw, 46px); font-weight: 400; }
h2 { font-size: clamp(22px, 3vw, 32px); }
.quiet { color: var(--mute); }
.seal-box { margin: 14px 0 10px; padding: 12px 14px; background: var(--vermilion); color: #fff8ea; border-radius: 8px; }
.seal-box span { font-family: var(--mono); font-size: 12px; color: #f0c8c0; }
.seal-box strong { display: block; margin: 6px 0 4px; }
.seal-box p { margin: 0; font-size: 14px; color: #f6ddd8; }
.seal-btns { display: flex; flex-wrap: wrap; gap: 8px; }
.seal-btns button { background: #fff8ea; border: 1px solid #d4b48a; border-radius: 999px; padding: 7px 12px; }
.seal-btns button.on { background: var(--paddy); color: #fff; border-color: var(--paddy); }
.cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.btn { display: inline-block; padding: 10px 16px; border: 1px solid var(--vermilion); border-radius: 999px; font-weight: 700; }
.btn.fill { background: var(--vermilion); color: #fff8ea; }
.btn.ghost { background: transparent; }
.wrap { width: min(1000px, calc(100% - 40px)); margin: 0 auto; padding: 72px 0; }
.field { background: #e4efd8; }
.tri, .io, .pair { display: grid; gap: 16px; }
.tri { grid-template-columns: repeat(3, 1fr); }
.io, .pair { grid-template-columns: 1fr 1fr; }
.tri article, .io article { background: #fff8ea; padding: 16px; border: 1px solid #d4c49a; }
.tri .warn { border-color: var(--vermilion); }
.seq { list-style: none; margin: 0 0 28px; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.seq li { background: #fff8ea; padding: 14px; border-top: 4px solid var(--paddy); }
ul { margin: 0; padding-left: 1.1em; }
li + li { margin-top: 6px; }
figure { margin: 0; }
figcaption { color: var(--mute); font-size: 13px; margin-top: 8px; }
.bound { max-width: 720px; }
footer { padding: 24px 20px 48px; border-top: 3px solid var(--vermilion); display: flex; justify-content: space-between; color: var(--mute); font-size: 14px; }
@media (max-width: 900px) {
  .nav-toggle { display: inline-block; }
  .seal-links { display: none; position: absolute; top: 58px; left: 0; right: 0; background: #fff8ea; padding: 12px 16px; flex-direction: column; align-items: flex-start; }
  .seal-links.open { display: flex; }
  .paddy > img { height: 40vh; }
  .stamp { position: relative; left: 0; bottom: 0; width: auto; box-shadow: none; }
  .tri, .io, .pair, .seq { grid-template-columns: 1fr; }
  footer { flex-direction: column; gap: 8px; }
}