*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #000;
  --fg: rgba(255, 255, 255, 0.92);
  --fg-dim: rgba(255, 255, 255, 0.48);
  --fg-mute: rgba(255, 255, 255, 0.28);
  --line: rgba(255, 255, 255, 0.12);
  --line-strong: rgba(255, 255, 255, 0.28);
  --card: rgba(255, 255, 255, 0.03);
  --card-hover: rgba(255, 255, 255, 0.06);
  --pink: #f9a8d4;
  --green: #4ade80;
  --prose: rgba(255, 255, 255, 0.78);
}

html { scroll-behavior: smooth; background: var(--bg); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: "SF Pro Display", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.65;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--fg); }
button { font-family: inherit; }
img, video { max-width: 100%; display: block; }
:focus-visible {
  outline: 1.5px solid rgba(249, 168, 212, 0.7);
  outline-offset: 3px;
}

.top-line {
  position: fixed; top: 0; left: 0; right: 0;
  height: 1.5px; background: var(--pink); z-index: 200;
}

.site-header {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 18px clamp(16px, 4vw, 56px);
  background: rgba(0, 0, 0, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.logo { font-size: 15px; font-weight: 500; letter-spacing: 0.08em; }
.logo em { font-style: normal; font-weight: 400; opacity: 0.7; }

.nav { display: flex; align-items: center; gap: clamp(12px, 2vw, 24px); flex-wrap: wrap; }
.nav a {
  font-size: 13px; letter-spacing: 0.05em; color: var(--fg-dim); transition: color 0.2s;
}
.nav a:hover, .nav a.is-active { color: var(--fg); }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 36px; padding: 0 16px; border-radius: 999px;
  border: 1px solid var(--line-strong); background: transparent; color: var(--fg);
  font-size: 13px; letter-spacing: 0.04em; cursor: pointer;
  transition: background 0.25s, border-color 0.25s;
  white-space: nowrap;
}
.btn:hover { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.5); }
.btn-solid { background: #f3f3f3; color: #111; border-color: #f3f3f3; }
.btn-solid:hover { background: #fff; }

.wrap {
  width: min(760px, calc(100% - 40px));
  margin: 0 auto;
  padding: 48px 0 80px;
}

.wrap-wide {
  width: min(1000px, calc(100% - 40px));
  margin: 0 auto;
  padding: 48px 0 80px;
}

.breadcrumb {
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
  font-size: 12px; letter-spacing: 0.06em; color: var(--fg-mute);
  margin-bottom: 28px;
}
.breadcrumb a { color: var(--fg-dim); }
.breadcrumb a:hover { color: var(--fg); }
.breadcrumb span[aria-hidden] { opacity: 0.5; }

.kicker {
  font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--fg-mute); margin-bottom: 14px;
}

h1 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 400; letter-spacing: 0.04em; line-height: 1.3;
  margin-bottom: 16px;
}

.lead {
  font-size: 16px; color: var(--fg-dim); line-height: 1.8;
  margin-bottom: 36px; max-width: 640px;
}

.meta-row {
  display: flex; flex-wrap: wrap; gap: 12px 18px;
  font-size: 12px; letter-spacing: 0.06em; color: var(--fg-mute);
  margin-bottom: 36px; padding-bottom: 20px; border-bottom: 1px solid var(--line);
}

.prose h2 {
  font-size: 22px; font-weight: 400; letter-spacing: 0.03em;
  margin: 40px 0 14px; line-height: 1.35;
}
.prose h3 {
  font-size: 17px; font-weight: 400; letter-spacing: 0.02em;
  margin: 28px 0 10px; color: rgba(255,255,255,0.88);
}
.prose p { font-size: 15px; color: var(--prose); line-height: 1.85; margin-bottom: 16px; }
.prose ul, .prose ol {
  margin: 0 0 18px 1.2em; color: var(--prose); font-size: 15px; line-height: 1.8;
}
.prose li { margin-bottom: 8px; }
.prose strong { color: var(--fg); font-weight: 500; }
.prose a {
  color: rgba(249, 168, 212, 0.9);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(249, 168, 212, 0.35);
}
.prose a:hover { color: #f9a8d4; text-decoration-color: #f9a8d4; }
.prose blockquote {
  margin: 24px 0;
  padding: 14px 18px;
  border-left: 2px solid var(--pink);
  background: var(--card);
  color: var(--fg-dim);
  font-size: 15px;
  line-height: 1.75;
}
.prose code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  padding: 1px 6px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255,255,255,0.04);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px 20px;
  background: var(--card);
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
  display: flex; flex-direction: column; gap: 10px;
  min-height: 160px;
}
.card:hover {
  background: var(--card-hover);
  border-color: var(--line-strong);
  transform: translateY(-2px);
}
.card .tag {
  font-size: 11px; letter-spacing: 0.14em; color: var(--fg-mute); text-transform: uppercase;
}
.card h2, .card h3 {
  font-size: 17px; font-weight: 400; letter-spacing: 0.02em; margin: 0;
}
.card p { font-size: 13px; color: var(--fg-dim); line-height: 1.65; margin: 0; flex: 1; }
.card .more { font-size: 12px; letter-spacing: 0.08em; color: var(--fg-mute); }

.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin: 28px 0 36px;
}
.fact {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  background: var(--card);
}
.fact dt { font-size: 11px; letter-spacing: 0.12em; color: var(--fg-mute); margin-bottom: 6px; }
.fact dd { font-size: 14px; color: var(--fg-dim); }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 24px clamp(16px, 4vw, 56px) 36px;
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-size: 12px; letter-spacing: 0.04em; color: var(--fg-mute);
  max-width: 1120px; margin: 0 auto;
}
.site-footer nav { display: flex; gap: 16px; flex-wrap: wrap; }
.site-footer a:hover { color: var(--fg-dim); }

.related {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.related h2 {
  font-size: 14px; font-weight: 400; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--fg-mute); margin-bottom: 14px;
}
.related ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.related a {
  display: flex; justify-content: space-between; gap: 12px;
  padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px;
  font-size: 14px; color: var(--fg-dim); transition: background 0.2s, border-color 0.2s;
}
.related a:hover { background: var(--card-hover); border-color: var(--line-strong); color: var(--fg); }
.related a small { color: var(--fg-mute); letter-spacing: 0.06em; }

@media (max-width: 640px) {
  .nav a:not(.btn) { display: none; }
  .wrap, .wrap-wide { width: calc(100% - 32px); padding-top: 32px; }
}