/* 拼图日记协议页：与个人站 /jigsaw 暗色体系一致（勿与烟花 legal.css 混用） */
:root {
  --bg: oklch(14% 0.008 260);
  --surface: oklch(19% 0.01 260);
  --surface-2: oklch(23% 0.012 260);
  --fg: oklch(97% 0.004 255);
  --muted: oklch(78% 0.012 255);
  --muted-2: oklch(68% 0.01 255);
  --border: oklch(34% 0.012 260);
  --border-strong: oklch(42% 0.014 260);
  --accent: oklch(72% 0.12 250);
  --accent-soft: oklch(88% 0.04 250);
  --font-display: "SF Pro Display", "Segoe UI", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-ui: "SF Pro Text", "Segoe UI", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  min-height: 100vh;
  color: var(--fg);
  font-family: var(--font-ui);
  background:
    radial-gradient(ellipse 90% 50% at 50% -8%, oklch(28% 0.04 250 / 0.4), transparent 55%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  min-height: 64px;
  padding: 12px 20px;
  background: color-mix(in oklch, var(--bg) 88%, transparent);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px) saturate(1.15);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  color: var(--fg);
}
.brand-mark {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: linear-gradient(145deg, #5b9bd9, #2f6db4);
  border: 1px solid color-mix(in oklch, var(--accent) 35%, transparent);
  box-shadow: 0 6px 18px oklch(40% 0.08 250 / 0.35);
}
.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.brand b {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.brand em {
  font-style: normal;
  color: var(--muted);
  font-size: 13px;
  margin-left: 8px;
  font-weight: 500;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}
.nav-pill {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  color: color-mix(in oklch, var(--fg) 90%, var(--muted));
  background: color-mix(in oklch, var(--surface) 70%, transparent);
  font-weight: 550;
  font-size: 13px;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.nav-pill:hover {
  color: var(--fg);
  background: var(--surface-2);
  border-color: color-mix(in oklch, var(--accent) 40%, var(--border));
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 36px 20px 64px;
}
.doc-head {
  text-align: center;
  padding-bottom: 24px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border);
}
.doc-head h1 {
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 32px);
  font-weight: 650;
  letter-spacing: -0.03em;
  color: var(--fg);
}
.doc-head p {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.doc h2 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 34px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--fg);
}
.doc h2::before {
  content: "";
  flex: 0 0 auto;
  width: 4px;
  height: 16px;
  border-radius: 2px;
  background: linear-gradient(180deg, #7eb6ef, #3d7ec4);
}
.doc h2:first-of-type { margin-top: 0; }
.doc p {
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.85;
  color: color-mix(in oklch, var(--fg) 88%, var(--muted));
}
.doc ul {
  margin-top: 14px;
  padding-left: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}
.doc li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.8;
  color: color-mix(in oklch, var(--fg) 86%, var(--muted));
}
.doc li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in oklch, var(--accent) 18%, transparent);
}
.doc strong {
  color: var(--fg);
  font-weight: 600;
}
.doc a {
  color: var(--accent-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: color-mix(in oklch, var(--accent) 45%, transparent);
}
.doc a:hover {
  color: var(--fg);
  text-decoration-color: color-mix(in oklch, var(--fg) 55%, transparent);
}

.footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 28px 20px 44px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 13px;
}
.footer b {
  font-family: var(--font-display);
  font-size: 15px;
  color: color-mix(in oklch, var(--fg) 88%, var(--muted));
  font-weight: 560;
}
.footer a { color: var(--muted); }
.footer a:hover { color: var(--fg); }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (max-width: 520px) {
  .brand em { display: none; }
  .nav { padding: 10px 14px; }
  main { padding: 28px 16px 48px; }
}