:root {
  --bg: #070b12;
  --ink: #e7f0fa;
  --muted: #93a4ba;
  --line: rgba(126, 176, 255, 0.18);
  --accent: #3ef0e2;
  --accent-2: #7eb6ff;
  --panel: rgba(12, 18, 30, 0.78);
  --code: #05080d;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 100% -10%, rgba(90, 150, 255, 0.22), transparent 55%),
    radial-gradient(700px 380px at -10% 10%, rgba(62, 240, 226, 0.1), transparent 50%),
    #070b12;
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.75;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(126, 176, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(126, 176, 255, 0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 15%, transparent 72%);
}
a { color: inherit; }
.top {
  position: sticky;
  top: 0;
  z-index: 2;
  background: rgba(7, 11, 18, 0.82);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.top-inner, .wrap { width: min(1040px, calc(100% - 2rem)); margin: 0 auto; }
.top-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding: 0.9rem 0;
}
.brand { display: flex; align-items: center; gap: 0.7rem; text-decoration: none; }
.mark {
  width: 0.7rem;
  height: 0.7rem;
  border: 1px solid var(--accent);
  box-shadow: 0 0 12px rgba(62, 240, 226, 0.7);
  transform: rotate(45deg);
}
.brand-name {
  font-size: 1.05rem;
  letter-spacing: 0.14em;
}
.brand small {
  display: block;
  color: var(--accent);
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
}
.top nav { display: flex; gap: 0.5rem; }
.top nav a {
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line);
  padding: 0.25rem 0.7rem;
  font-size: 0.86rem;
}
.top nav a:hover { color: var(--accent); border-color: rgba(62, 240, 226, 0.5); }
.wrap { position: relative; padding: 2.4rem 0 3rem; }
.hero {
  padding: 1.4rem 1.3rem 1.2rem;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(18, 28, 46, 0.9), rgba(10, 16, 28, 0.72));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.02), 0 20px 60px rgba(0, 0, 0, 0.25);
}
.eyebrow {
  margin: 0 0 0.7rem;
  color: var(--accent);
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
}
.hero h1 {
  margin: 0;
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  font-weight: 650;
  letter-spacing: 0.06em;
  line-height: 1.15;
}
.dek { max-width: 40rem; margin: 0.9rem 0 0; color: #c5d3e4; }
.groups { margin-top: 1.6rem; display: grid; gap: 1.2rem; }
.group {
  border: 1px solid var(--line);
  background: var(--panel);
}
.group h2 {
  margin: 0;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--line);
  color: var(--accent-2);
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.18em;
}
.entry {
  display: grid;
  grid-template-columns: 2.4rem 1fr auto;
  gap: 0.8rem;
  align-items: start;
  padding: 0.9rem 1rem;
  border-top: 1px solid rgba(126, 176, 255, 0.08);
  text-decoration: none;
}
.group h2 + .entry { border-top: 0; }
.entry:hover { background: rgba(62, 240, 226, 0.05); }
.idx {
  color: var(--accent);
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 0.78rem;
  padding-top: 0.28rem;
}
.entry h3 { margin: 0 0 0.2rem; font-size: 1.05rem; font-weight: 600; }
.entry p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.tag {
  color: var(--accent-2);
  border: 1px solid rgba(126, 182, 255, 0.35);
  padding: 0.05rem 0.4rem;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}
article.wrap { width: min(760px, calc(100% - 2rem)); }
.back {
  color: var(--accent);
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 0.82rem;
  text-decoration: none;
}
.kicker {
  margin: 1.1rem 0 0;
  color: var(--accent);
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
}
article h1 { margin: 0.4rem 0 0; font-size: clamp(1.7rem, 4vw, 2.4rem); line-height: 1.3; font-weight: 650; }
.summary { color: #c5d3e4; }
.source {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}
.source a { color: var(--accent); }
article h2 {
  margin: 2rem 0 0.55rem;
  padding-left: 0.7rem;
  border-left: 2px solid var(--accent);
  font-size: 1.15rem;
}
article p { margin: 0 0 0.9rem; }
article ul { margin: 0 0 1rem; padding-left: 1.15rem; }
article li { margin: 0.35rem 0; }
article li::marker { color: var(--accent); }
pre {
  margin: 0 0 1rem;
  padding: 1rem 1rem 1rem 1.05rem;
  overflow-x: auto;
  background: var(--code);
  color: #d7fff8;
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent);
  font-size: 0.84rem;
  line-height: 1.6;
}
code { font-family: "SF Mono", "JetBrains Mono", ui-monospace, monospace; }
footer {
  position: relative;
  padding: 1.2rem 1rem 1.7rem;
  text-align: center;
  border-top: 1px solid var(--line);
}
footer .owner {
  margin: 0 0 0.35rem;
  color: var(--muted);
  font-family: "SF Mono", ui-monospace, monospace;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
}
footer .beian { margin: 0; font-size: 0.95rem; }
footer .beian a { color: #d5e6f5; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
@media (max-width: 640px) {
  .entry { grid-template-columns: 2rem 1fr; }
  .tag { display: none; }
  .top-inner { align-items: flex-start; }
}