/* Shared light theme for the public user agreement and privacy policy. */
:root {
  --lg-bg: #f4f7fb;
  --lg-bg2: #ffffff;
  --lg-surface: #ffffff;
  --lg-soft: #f7f9fc;
  --lg-line: #dbe4ee;
  --lg-line-strong: #c5d2df;
  --lg-tx: #556779;
  --lg-hi: #17212c;
  --lg-dim: #738293;
  --lg-cyan: #0b6f66;
  --lg-cyan-soft: #e2f5f2;
  --lg-cyan-line: #b9dcd7;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  color: var(--lg-tx);
  background-color: var(--lg-bg);
  background-image:
    linear-gradient(rgba(23, 33, 44, .022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 33, 44, .022) 1px, transparent 1px);
  background-size: 80px 80px, 80px 80px;
  font: 15px/1.9 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--lg-cyan) 72%, transparent);
  outline-offset: 3px;
}

/* Sticky header, matching the public site rather than the retired dark shell. */
.lg-top {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid rgba(23, 33, 44, .16);
  background: color-mix(in srgb, var(--lg-surface) 94%, var(--lg-bg));
  box-shadow: 0 10px 30px rgba(29, 53, 82, .075), inset 0 1px 0 rgba(255, 255, 255, .82);
  -webkit-backdrop-filter: blur(18px) saturate(1.1);
  backdrop-filter: blur(18px) saturate(1.1);
}

.lg-top::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--lg-cyan-line) 24%, var(--lg-cyan) 50%, var(--lg-cyan-line) 76%, transparent);
  opacity: .7;
}

.lg-top-in {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
  height: 68px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.lg-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--lg-hi);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -.015em;
}

.lg-brand::before {
  content: "素";
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  color: #fff;
  background: var(--lg-cyan);
  font-size: 14px;
  font-weight: 800;
}

.lg-switch {
  display: flex;
  gap: 22px;
  margin-left: auto;
}

.lg-switch a {
  position: relative;
  padding: 4px 0;
  color: var(--lg-dim);
  font-size: 11.5px;
  transition: color .18s ease;
}

.lg-switch a:hover {
  color: var(--lg-cyan);
}

.lg-switch a.on {
  color: var(--lg-cyan);
  font-weight: 700;
}

.lg-switch a.on::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -2px;
  left: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--lg-cyan);
}

.lg-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 32px 92px;
  display: grid;
  grid-template-columns: 238px minmax(0, 1fr);
  gap: 34px;
  align-items: start;
}

.lg-aside {
  position: sticky;
  top: 92px;
  padding: 16px 10px 14px;
  overflow: hidden;
  border: 1px solid var(--lg-line);
  border-radius: 14px;
  background: var(--lg-surface);
  box-shadow: 0 12px 32px rgba(29, 53, 82, .05);
}

.lg-toc-cap {
  margin: 0 0 8px 13px;
  color: var(--lg-dim);
  font-size: 10px;
  letter-spacing: .1em;
}

.lg-toc {
  max-height: calc(100vh - 160px);
  overflow-y: auto;
  padding-right: 2px;
}

.lg-toc ul,
.lg-tocm-panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.lg-toc a {
  display: block;
  margin-left: 2px;
  padding: 6px 8px 6px 12px;
  border-left: 2px solid transparent;
  color: var(--lg-dim);
  font-size: 11.5px;
  line-height: 1.5;
  transition: color .18s ease, background .18s ease, border-color .18s ease;
}

.lg-toc a:hover {
  color: var(--lg-hi);
  background: var(--lg-soft);
}

.lg-toc li.lvl3 a {
  padding: 5px 8px 5px 22px;
  color: #8290a0;
  font-size: 10.5px;
}

.lg-toc a.on {
  color: var(--lg-cyan);
  border-left-color: var(--lg-cyan);
  background: var(--lg-cyan-soft);
  font-weight: 700;
}

.lg-toc li.lvl3 a.on {
  color: var(--lg-cyan);
}

.lg-toc::-webkit-scrollbar {
  width: 5px;
}

.lg-toc::-webkit-scrollbar-thumb {
  border-radius: 4px;
  background: var(--lg-line-strong);
}

.lg-toc::-webkit-scrollbar-track {
  background: transparent;
}

/* Mobile chapter picker. */
.lg-tocm {
  display: none;
  position: relative;
  margin-bottom: 22px;
}

.lg-tocm-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--lg-line-strong);
  border-radius: 10px;
  color: var(--lg-tx);
  background: var(--lg-surface);
  font: inherit;
  font-size: 13px;
  text-align: left;
  cursor: pointer;
}

.lg-tocm-btn b {
  flex: 0 0 auto;
  color: var(--lg-dim);
  font-size: 11px;
  font-weight: 600;
}

.lg-tocm-btn em {
  flex: 1 1 auto;
  overflow: hidden;
  color: var(--lg-hi);
  font-style: normal;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lg-tocm-btn i {
  flex: 0 0 auto;
  color: var(--lg-dim);
  font-style: normal;
  font-size: 10px;
  transition: transform .18s ease;
}

.lg-tocm-btn[aria-expanded="true"] i {
  transform: rotate(180deg);
}

.lg-tocm-panel {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  left: 0;
  z-index: 40;
  max-height: 56vh;
  overflow-y: auto;
  padding: 7px;
  border: 1px solid var(--lg-line-strong);
  border-radius: 12px;
  background: var(--lg-surface);
  box-shadow: 0 22px 56px rgba(29, 53, 82, .16);
}

.lg-tocm-panel a {
  display: block;
  padding: 10px 11px;
  border-radius: 7px;
  color: var(--lg-tx);
  font-size: 12px;
  line-height: 1.5;
}

.lg-tocm-panel a.on {
  color: var(--lg-cyan);
  background: var(--lg-cyan-soft);
  font-weight: 700;
}

/* Reading surface. */
.lg-doc {
  min-width: 0;
  max-width: 860px;
  padding: 40px 44px 48px;
  border: 1px solid var(--lg-line-strong);
  border-radius: 16px;
  background: var(--lg-surface);
  box-shadow: 0 22px 60px rgba(29, 53, 82, .075);
}

.lg-h1 {
  margin: 0 0 13px;
  color: var(--lg-hi);
  font-size: clamp(25px, 3vw, 32px);
  font-weight: 750;
  line-height: 1.35;
  letter-spacing: -.035em;
}

.lg-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 22px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--lg-line);
  color: var(--lg-dim);
  font-size: 11px;
}

.lg-meta i {
  color: var(--lg-line-strong);
  font-style: normal;
}

.lg-h2 {
  margin: 38px 0 13px;
  padding-top: 21px;
  border-top: 1px solid var(--lg-line);
  color: var(--lg-hi);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -.018em;
  scroll-margin-top: 90px;
}

.lg-h2.sec-first {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.lg-h3 {
  margin: 25px 0 9px;
  color: var(--lg-hi);
  font-size: 14.5px;
  font-weight: 700;
  line-height: 1.6;
  scroll-margin-top: 90px;
}

.lg-p {
  margin: 10px 0;
  color: var(--lg-tx);
  font-size: 13px;
  line-height: 1.95;
}

.lg-p strong,
.lg-ul strong,
.lg-ol strong,
.lg-end strong {
  color: var(--lg-hi);
  font-weight: 700;
}

.lg-ul,
.lg-ol {
  margin: 9px 0 15px;
  padding-left: 21px;
}

.lg-ul li,
.lg-ol li {
  margin: 6px 0;
  padding-left: 2px;
  color: var(--lg-tx);
  font-size: 13px;
  line-height: 1.85;
}

.lg-ul li::marker {
  color: var(--lg-line-strong);
}

.lg-ol li::marker {
  color: var(--lg-cyan);
  font-weight: 700;
}

.lg-hr {
  margin: 32px 0 0;
  border: 0;
  border-top: 1px solid var(--lg-line);
}

.lg-end {
  margin: 34px 0 0;
  color: var(--lg-dim);
  font-size: 11px;
  letter-spacing: .08em;
  text-align: center;
}

.lg-foot {
  padding: 22px 32px 32px;
  border-top: 1px solid var(--lg-line);
  background: var(--lg-bg);
}

.lg-foot-in {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px 16px;
  color: var(--lg-dim);
  font-size: 10.5px;
}

.lg-foot-in a {
  color: var(--lg-dim);
  transition: color .18s ease;
}

.lg-foot-in a:hover {
  color: var(--lg-cyan);
}

.lg-foot-in .sp {
  flex: 1 1 auto;
}

.lg-foot-in .lg-upd {
  color: #8290a0;
  font-size: 10px;
}

@media (min-width: 1024px) and (max-width: 1243px) {
  .lg-top-in {
    padding: 0 24px;
  }

  .lg-main {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 26px;
    padding: 34px 24px 82px;
  }

  .lg-doc {
    padding: 34px 36px 42px;
  }
}

@media (max-width: 1023px) {
  .lg-top-in {
    height: 62px;
    padding: 0 24px;
    gap: 18px;
  }

  .lg-main {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    padding: 26px 22px 68px;
  }

  .lg-aside {
    position: static;
    margin-bottom: 18px;
    padding: 0;
    overflow: visible;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

  .lg-toc,
  .lg-toc-cap {
    display: none;
  }

  .lg-tocm {
    display: block;
  }

  .lg-doc {
    max-width: none;
  }
}

@media (max-width: 640px) {
  .lg-top-in {
    height: 58px;
    padding: 0 16px;
    gap: 12px;
  }

  .lg-brand {
    font-size: 13px;
  }

  .lg-brand::before {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    font-size: 12px;
  }

  .lg-switch {
    gap: 14px;
  }

  .lg-switch a {
    font-size: 10.5px;
  }

  .lg-main {
    padding: 18px 12px 48px;
  }

  .lg-doc {
    padding: 26px 19px 34px;
    border-radius: 13px;
  }

  .lg-h1 {
    font-size: 23px;
  }

  .lg-h2 {
    margin-top: 30px;
    padding-top: 17px;
    font-size: 16.5px;
    scroll-margin-top: 76px;
  }

  .lg-h3 {
    font-size: 14px;
    scroll-margin-top: 76px;
  }

  .lg-p,
  .lg-ul li,
  .lg-ol li {
    font-size: 13.5px;
    line-height: 1.9;
  }

  .lg-tocm-panel a {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: 11px 12px;
    font-size: 12px;
  }

  .lg-foot {
    padding: 20px 16px 28px;
  }

  .lg-foot-in {
    gap: 8px 13px;
  }
}

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

  * {
    transition: none !important;
  }
}