@font-face {
  font-family: "HYWenHei";
  src: url("fonts/hywh.woff") format("woff");
  font-weight: 400 900;
  font-display: swap;
}
:root {
  --bg: #141a18;
  --bg2: #0c100f;
  --card: rgba(28,37,36,.55);
  --slate: #33474f;
  --steel: #557283;
  --sand: #dbc599;
  --sanddim: #96886c;
  --body: #b9ac8f;
  --green: #adffa3;
  --red: #c35952;
  --hair: rgba(219,197,153,.22);
  --hairsoft: rgba(219,197,153,.12);
}
* { box-sizing: border-box; }
html { background: var(--bg); scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--body);
  font-family: "HYWenHei", "Hiragino Sans GB", "Microsoft YaHei",
               "Noto Sans SC", "PingFang SC", sans-serif;
  line-height: 1.7; font-size: 16px;
}
a { color: var(--sand); text-decoration: underline;
  text-decoration-color: rgba(219,197,153,.45); text-underline-offset: 3px; }
a:hover { color: #fff; }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .85em; background: var(--bg2); border: 1px solid var(--hair);
  border-radius: 8px; padding: 1px 7px; color: var(--green); word-break: break-all;
}
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.wrap.narrow { max-width: 800px; }

/* top bar */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(12,16,15,.94);
  border-bottom: 1px solid var(--hair);
}
.topbar .wrap { display: flex; align-items: center; gap: 22px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none;
  color: var(--sand); font-weight: 800; letter-spacing: .12em; }
.brand svg { width: 28px; height: 28px; }
.navlinks { display: flex; gap: 4px; margin-left: 8px; }
.navlinks a { color: var(--sanddim); text-decoration: none; padding: 6px 14px;
  border-radius: 999px; font-size: .95rem; }
.navlinks a:hover { color: var(--sand); background: rgba(219,197,153,.08); }
.navlinks a.here { color: var(--sand); background: rgba(219,197,153,.12); }
.topright { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.gh { color: var(--sanddim); text-decoration: none; font-size: .9rem; }
.gh:hover { color: var(--sand); }

/* menu-style buttons */
.btn {
  display: inline-block; text-decoration: none;
  padding: 11px 30px; font-size: 1rem; font-weight: 700; color: var(--sand);
  background: #3f5661;
  border: 1px solid var(--hair); border-radius: 999px;
}
.btn:hover { color: #fff; border-color: rgba(219,197,153,.55); }
.btn.primary { background: var(--sand); border-color: var(--sand); color: #141a18; }
.btn.primary:hover { background: #fff; color: #141a18; }
.btn.small { padding: 7px 18px; font-size: .88rem; }
.btn.ghost { background: transparent; border-color: rgba(219,197,153,.35); }

/* hero */
.hero { text-align: center; padding: 72px 0 30px; }
.hero svg.mark { width: 120px; height: 120px; }
.hero h1 { font-size: 3.2rem; margin: 18px 0 6px; letter-spacing: .1em; font-weight: 800; color: var(--sand); }
.hero .tag { color: var(--sanddim); font-size: 1.15rem; margin: 0 0 28px; }
.hero .cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero .meta { margin-top: 22px; color: var(--sanddim); font-size: .85rem; }

/* menu-style section header: diamond, sand text, hairline */
section.block { padding: 44px 0 8px; }
.sec { display: flex; align-items: center; gap: 12px;
  font-size: 1.35rem; margin: 0 0 6px; font-weight: 800; color: var(--sand); }
.sec::before { content: ""; width: 9px; height: 9px; background: var(--sand);
  transform: rotate(45deg); flex: none; }
.sec::after { content: ""; height: 1px; flex: 1; background: var(--hair); }
p.sub { color: var(--sanddim); margin: 0 0 24px; }
.center { text-align: center; }
.center p.sub { max-width: 640px; margin-left: auto; margin-right: auto; }
.center .sec::before { display: none; }
.center .sec { justify-content: center; }
.center .sec::after { display: none; }

/* feature grid */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.feat { background: var(--card); border: 1px solid var(--hairsoft);
  border-radius: 14px; padding: 16px 18px; }
.feat h3 { margin: 0 0 4px; font-size: 1rem; color: var(--sand); font-weight: 700;
  display: flex; align-items: center; gap: 10px; }
.feat h3::before { content: ""; width: 7px; height: 7px; border: 1px solid var(--sand); transform: rotate(45deg); flex: none; }
.feat h3 svg { width: 22px; height: 22px; flex: none; }
.feat p { margin: 0; color: var(--sanddim); font-size: .9rem; line-height: 1.6; }

/* split rows */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; margin: 10px 0 26px; }
.split.flip > div:first-child { order: 2; }
.split h3 { font-size: 1.3rem; margin: 0 0 8px; color: var(--sand); }
.split p { color: var(--sanddim); margin: 0 0 10px; }

/* risk pills */
.pill { display: inline-block; border: 1px solid; border-radius: 999px;
  padding: 0 11px; font-size: .78rem; font-weight: 700; margin: 0 4px 4px 0; white-space: nowrap; }
.pill.local { border-color: var(--green); color: var(--green); }
.pill.server { border-color: var(--sand); color: var(--sand); }
.pill.sent { border-color: var(--red); color: var(--red); }

/* docs pages */
.doc h2 { display: flex; align-items: center; gap: 12px;
  font-size: 1.4rem; margin: 2.2em 0 .5em; color: var(--sand); }
.doc h2::before { content: ""; width: 8px; height: 8px; background: var(--sand);
  transform: rotate(45deg); flex: none; }
.doc h2:first-of-type { margin-top: 1em; }
.doc h3 { font-size: 1.08rem; color: var(--sand); margin: 1.5em 0 .3em; font-weight: 700; }
.doc p, .doc li { color: var(--body); }
.doc .dim, .dim { color: var(--sanddim); }
.card { background: var(--card); border: 1px solid var(--hairsoft);
  border-radius: 14px; padding: 16px 20px; margin: 14px 0; }
.card h3 { margin-top: 0; }
table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: .93rem; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--hair); vertical-align: top; }
th { color: var(--sand); font-size: .85rem; }
pre { background: var(--bg2); border: 1px solid var(--hair); border-radius: 10px;
  padding: 14px 16px; overflow-x: auto; font-size: .85rem; }
ol, ul { padding-left: 22px; }
li { margin-bottom: 6px; }
.note { border-left: 3px solid var(--sand); padding: 2px 0 2px 14px; margin: 14px 0; }
.warn { border-left: 3px solid var(--red); padding: 2px 0 2px 14px; margin: 14px 0; }
.stamp { display: inline-block; border: 2px solid var(--red); color: var(--red);
  padding: 3px 12px; transform: rotate(-2deg); font-weight: 700; font-size: .88rem;
  border-radius: 10px; margin: 6px 0; }

/* footer */
footer.site { margin-top: 70px; border-top: 1px solid var(--hair); padding: 26px 0 40px;
  color: var(--sanddim); font-size: .83rem; text-align: center; }
footer.site p { margin: 4px 0; }

::-webkit-scrollbar { width: 10px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #33474f; border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: #557283; }
* { scrollbar-width: thin; scrollbar-color: #33474f transparent; }

@media (max-width: 820px) {
  .grid { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; gap: 18px; }
  .split.flip > div:first-child { order: 0; }
  .hero h1 { font-size: 2.4rem; }
  .navlinks a { padding: 6px 8px; font-size: .88rem; }
}
@media (max-width: 560px) { .grid { grid-template-columns: 1fr; } }