:root {
  --bg: #f6f8f3;
  --card: rgba(255,255,255,0.94);
  --text: #153225;
  --muted: #597163;
  --line: #dfe7dc;
  --brand: #2f7d57;
  --shadow: 0 10px 30px rgba(25,45,28,0.08);
  --radius: 18px;
  --maxw: 920px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top right, rgba(141,166,143,0.18), transparent 28%), linear-gradient(180deg, #f8faf7 0%, var(--bg) 100%);
  line-height: 1.72;
}
a { color: var(--brand); }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 24px 20px 56px; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.brand { display: inline-flex; align-items: center; gap: 9px; color: var(--text); font-weight: 750; text-decoration: none; }
.brand img { width: 34px; height: 34px; border-radius: 10px; object-fit: cover; }
.language-link { padding: 7px 12px; border: 1px solid rgba(31,42,31,0.12); border-radius: 999px; background: rgba(255,255,255,0.85); text-decoration: none; font-size: 14px; }
.language-link:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.hero { background: var(--card); border: 1px solid rgba(255,255,255,0.72); box-shadow: var(--shadow); border-radius: 28px; padding: 28px 24px; backdrop-filter: blur(10px); }
h1 { margin: 0 0 8px; font-size: clamp(30px, 5vw, 42px); line-height: 1.18; letter-spacing: -0.02em; }
.subtitle { margin: 0; color: var(--muted); font-size: 16px; }
.meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.meta span { background: rgba(47,125,87,0.08); border: 1px solid rgba(47,125,87,0.14); color: var(--brand); padding: 7px 11px; border-radius: 999px; font-size: 13px; font-weight: 650; }
.summary { margin-top: 18px; padding: 15px 17px; border-radius: 14px; background: #f5faf6; border: 1px solid #d7e8da; }
.summary p { margin: 5px 0; }
.grid { display: grid; grid-template-columns: 235px minmax(0, 1fr); gap: 20px; margin-top: 22px; }
.toc, .card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.toc { padding: 18px 16px; position: sticky; top: 20px; height: fit-content; }
.toc strong { display: block; margin-bottom: 8px; color: var(--brand); }
.toc a { display: block; color: var(--text); text-decoration: none; padding: 7px 9px; border-radius: 9px; font-size: 14px; }
.toc a:hover { background: #f3f7f2; }
.card { padding: 26px 22px; }
h2 { margin: 28px 0 12px; color: var(--brand); font-size: 23px; letter-spacing: -0.01em; }
h2:first-child { margin-top: 0; }
h3 { font-size: 17px; margin: 20px 0 7px; }
p { margin: 8px 0; }
ul { margin: 8px 0 8px 22px; padding: 0; }
li { margin: 8px 0; }
.small { color: var(--muted); font-size: 14px; }
.contact { background: #f7faf6; border: 1px dashed #c8d8c7; padding: 14px 16px; border-radius: 14px; margin-top: 12px; }
.contact p { overflow-wrap: anywhere; }
.footer { margin-top: 24px; color: var(--muted); font-size: 13px; text-align: center; }
@media (max-width: 860px) {
  .grid { grid-template-columns: 1fr; }
  .toc { position: static; }
}
@media (max-width: 520px) {
  .wrap { padding: 16px 14px 42px; }
  .hero, .card { padding: 22px 17px; }
}

.lang-switch { padding: 7px 30px 7px 13px; border-radius: 999px; background: rgba(255,255,255,0.85); border: 1px solid rgba(31,42,31,0.12); color: var(--muted); font-size: 14px; cursor: pointer; outline: none; appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns=%27http://www.w3.org/2000/svg%27 width=%2710%27 height=%276%27%3E%3Cpath d=%27M0 0l5 6 5-6z%27 fill=%27%23597163%27/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; }
.lang-switch:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }