:root {
  --bg: #f3f1eb;
  --ink: #1c1a16;
  --muted: #5e584e;
  --card: #fffdf8;
  --line: #d9d2c5;
  --accent: #0f6e62;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.55;
}
main { max-width: 1100px; margin: 0 auto; padding: 1.6rem 1.1rem 3rem; }
h1 { display: flex; align-items: center; gap: 0.55rem; margin: 0 0 0.35rem; font-size: 2rem; }
.logo { width: 1.7rem; height: 1.7rem; display: block; }
.lead, .hint, #status { color: var(--muted); }
.tools { display: flex; flex-wrap: wrap; gap: 0.7rem 1rem; align-items: center; }
button {
  font: inherit;
  background: var(--accent);
  color: white;
  border: 0;
  border-radius: 999px;
  padding: 0.55rem 0.95rem;
  cursor: pointer;
}
button.secondary { background: #d7efe9; color: #0c4a43; }
button:disabled { background: #e4e0d8; color: #8a8378; cursor: not-allowed; }
label { display: flex; gap: 0.3rem; align-items: center; }
.stage { display: grid; grid-template-columns: 1fr 260px; gap: 1rem; align-items: start; }
canvas {
  width: 100%;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: crosshair;
}
aside {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.8rem;
}
aside h2 { margin: 0 0 0.4rem; font-size: 1.05rem; }
ul { list-style: none; padding: 0; margin: 0.6rem 0 0; display: grid; gap: 0.4rem; }
li { display: flex; justify-content: space-between; gap: 0.4rem; align-items: center; }
li button { background: transparent; color: var(--ink); border: 1px solid var(--line); padding: 0.2rem 0.45rem; }
.note { max-width: 40rem; margin-top: 1.6rem; }
.note h2 { margin: 0 0 0.35rem; font-size: 1.05rem; }
.note p { margin: 0; color: var(--muted); }
@media (max-width: 800px) { .stage { grid-template-columns: 1fr; } }

.seo { max-width: 42rem; margin-top: 2rem; }
.seo h2 { margin: 1.4rem 0 0.45rem; font-size: 1.15rem; }
.seo h3 { margin: 1rem 0 0.35rem; font-size: 1.02rem; }
.seo p, .seo li { color: var(--muted); }
.seo ul { list-style: disc; padding-left: 1.2rem; margin: 0.4rem 0 0.8rem; display: block; }
.seo li { display: list-item; margin: 0.25rem 0; }
.seo details { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 0.7rem 0.9rem; margin: 0.45rem 0; }
.seo summary { cursor: pointer; font-weight: 600; color: var(--ink); }
.seo details p { margin: 0.45rem 0 0; }
.site-footer { margin-top: 2.2rem; padding-top: 1.1rem; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.95rem; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 0.55rem 1rem; margin-bottom: 0.55rem; }
.site-footer a { color: var(--accent); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.landing .cta { display: inline-block; margin: 1rem 0 0.4rem; background: var(--accent); color: #fff; border-radius: 999px; padding: 0.55rem 1.05rem; text-decoration: none; }
.landing .card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 1rem 1.1rem; margin: 1rem 0; }