.page-privacy {
  --pv-rail-w: 236px;
  --pv-line: var(--c-grid);
  --pv-ink: var(--c-star);
  --pv-dim: var(--c-grey);

  position: relative;
  display: block;
  background-color: var(--c-deep);
  background-image:
    radial-gradient(ellipse 70% 45% at 10% 4%, rgba(108, 75, 244, 0.26), transparent 68%),
    radial-gradient(ellipse 55% 38% at 92% 38%, rgba(0, 229, 255, 0.11), transparent 72%),
    radial-gradient(ellipse 60% 40% at 30% 96%, rgba(108, 75, 244, 0.14), transparent 70%);
  background-repeat: no-repeat;
  color: var(--pv-ink);
  font-family: var(--font-sans);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-privacy__hero {
  padding-top: 28px;
}

.page-privacy__hero-inner {
  position: relative;
  padding-bottom: 28px;
}

.page-privacy__title {
  margin: 14px 0 0;
  font-size: clamp(26px, 4.6vw, 46px);
  line-height: 1.24;
  letter-spacing: 0.02em;
  font-weight: 800;
  max-width: 20ch;
}

.page-privacy__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  color: var(--pv-dim);
  font-size: 16px;
  line-height: 1.8;
}

.page-privacy__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-privacy__band {
  position: relative;
  border-top: 1px solid var(--pv-line);
  border-bottom: 1px solid var(--pv-line);
  overflow: hidden;
  background: var(--c-panel);
}

.page-privacy__band::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(100deg, rgba(5, 10, 31, 0.92) 0%, rgba(5, 10, 31, 0.35) 42%, rgba(12, 19, 48, 0.7) 100%);
}

.page-privacy__band img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.9) contrast(1.05);
}

/* ---------- 主体两栏 ---------- */

.page-privacy__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding: 40px 0 72px;
}

/* 章节索引 */

.page-privacy__rail {
  min-width: 0;
}

.page-privacy__rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--pv-dim);
}

.page-privacy__rail-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  scrollbar-width: thin;
}

.page-privacy__rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 9px 12px;
  border: 1px solid var(--pv-line);
  background: rgba(12, 19, 48, 0.55);
  color: var(--pv-dim);
  font-size: 13.5px;
  line-height: 1;
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-privacy__rail-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-nebula);
  transition: color var(--t-fast) var(--ease);
}

.page-privacy__rail-link:hover,
.page-privacy__rail-link:focus-visible {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
}

.page-privacy__rail-link[aria-current] {
  color: var(--c-star);
  border-color: var(--c-cyan);
  background: rgba(0, 229, 255, 0.08);
}

.page-privacy__rail-link[aria-current] .page-privacy__rail-num {
  color: var(--c-cyan);
}

/* ---------- 章节 ---------- */

.page-privacy__body {
  min-width: 0;
}

.page-privacy__sec {
  margin-bottom: 46px;
}

.page-privacy__sec:last-child {
  margin-bottom: 0;
}

.page-privacy__sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--c-nebula);
}

.page-privacy__sec-head h2 {
  margin: 0;
  font-size: clamp(19px, 2.6vw, 25px);
  line-height: 1.35;
  letter-spacing: 0.04em;
  font-weight: 800;
  color: var(--pv-ink);
}

.page-privacy__intro {
  margin: 14px 0 6px;
  color: var(--pv-dim);
  font-size: 15px;
  line-height: 1.7;
}

/* ---------- 条目 ---------- */

.page-privacy__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--pv-line);
}

.page-privacy__list--tight {
  margin-top: 26px;
}

.page-privacy__item {
  border-bottom: 1px solid var(--pv-line);
}

.page-privacy__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 18px;
  align-items: start;
  gap: 10px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
  transition: background-color var(--t-fast) var(--ease);
}

.page-privacy__summary::-webkit-details-marker {
  display: none;
}

.page-privacy__summary:hover {
  background-color: rgba(0, 229, 255, 0.04);
}

.page-privacy__summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}

.page-privacy__num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--c-cyan);
  padding-top: 4px;
}

.page-privacy__concl {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--pv-ink);
}

.page-privacy__mark {
  position: relative;
  display: block;
  width: 16px;
  height: 16px;
  margin-top: 5px;
  justify-self: end;
}

.page-privacy__mark::before,
.page-privacy__mark::after {
  content: "";
  position: absolute;
  background: var(--c-nebula);
  transition: transform var(--t-base) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-privacy__mark::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-privacy__mark::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-privacy__item details[open] .page-privacy__mark::after {
  transform: scaleY(0);
}

.page-privacy__item details[open] .page-privacy__mark::before {
  background: var(--c-cyan);
}

.page-privacy__detail {
  margin: 0 0 18px;
  padding: 2px 0 2px 14px;
  border-left: 2px solid var(--c-nebula);
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--pv-dim);
}

/* ---------- 保存期限刻度 ---------- */

.page-privacy__scale {
  margin: 20px 0 0;
  padding: 18px 16px;
  border: 1px solid var(--pv-line);
  background: linear-gradient(180deg, rgba(12, 19, 48, 0.9) 0%, rgba(17, 27, 63, 0.6) 100%);
}

.page-privacy__scale-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-privacy__scale-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  align-items: center;
}

.page-privacy__scale-name {
  font-size: 13.5px;
  color: var(--pv-ink);
  letter-spacing: 0.02em;
}

.page-privacy__scale-track {
  position: relative;
  display: block;
  height: 9px;
  background: var(--c-deep);
  border: 1px solid var(--pv-line);
  overflow: hidden;
}

.page-privacy__scale-fill {
  display: block;
  height: 100%;
  background: var(--c-cyan);
}

.page-privacy__scale-row:nth-child(1) .page-privacy__scale-fill {
  width: 25%;
  background: var(--c-cyan);
}

.page-privacy__scale-row:nth-child(2) .page-privacy__scale-fill {
  width: 50%;
  background: var(--c-nebula);
}

.page-privacy__scale-row:nth-child(3) .page-privacy__scale-fill {
  width: 100%;
  background: var(--c-orange);
}

.page-privacy__scale-fill--hold {
  width: 100%;
  background-image: repeating-linear-gradient(
    135deg,
    var(--c-up) 0,
    var(--c-up) 5px,
    rgba(43, 217, 138, 0.28) 5px,
    rgba(43, 217, 138, 0.28) 10px
  );
}

.page-privacy__scale-val {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--c-star);
}

/* ---------- 联系面板 ---------- */

.page-privacy__sec--last {
  margin-bottom: 0;
}

.page-privacy__contact {
  margin-top: 18px;
}

.page-privacy__contact-line {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--pv-ink);
}

.page-privacy__mail {
  font-family: var(--font-mono);
  font-size: 14.5px;
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.45);
  word-break: break-all;
}

.page-privacy__mail:hover,
.page-privacy__mail:focus-visible {
  color: var(--c-orange);
  border-bottom-color: var(--c-orange);
}

.page-privacy__contact-note {
  margin: 12px 0 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--pv-dim);
}

.page-privacy__contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-privacy__backline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 26px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--pv-line);
  font-size: 13.5px;
}

.page-privacy__backline-sep {
  color: var(--c-grid);
}

.page-privacy__totop,
.page-privacy__sibling {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.35);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-privacy__totop::before {
  content: "↑ ";
  font-family: var(--font-mono);
}

.page-privacy__totop:hover,
.page-privacy__totop:focus-visible,
.page-privacy__sibling:hover,
.page-privacy__sibling:focus-visible {
  color: var(--c-orange);
  border-bottom-color: var(--c-orange);
}

/* ---------- 平板 ---------- */

@media (min-width: 700px) {
  .page-privacy__scale-row {
    grid-template-columns: 132px minmax(0, 1fr) 132px;
    gap: 14px;
  }

  .page-privacy__scale-val {
    text-align: right;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 1000px) {
  .page-privacy {
    --pv-rail-w: 244px;
  }

  .page-privacy__hero {
    padding-top: 40px;
  }

  .page-privacy__hero-inner {
    padding-bottom: 36px;
  }

  .page-privacy__layout {
    grid-template-columns: var(--pv-rail-w) minmax(0, 1fr);
    gap: 56px;
    padding: 56px 0 96px;
  }

  .page-privacy__rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-privacy__rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--pv-line);
  }

  .page-privacy__rail-link {
    display: flex;
    width: 100%;
    padding: 11px 12px;
    border: 0;
    border-left: 2px solid transparent;
    background: transparent;
    white-space: normal;
  }

  .page-privacy__rail-link:hover,
  .page-privacy__rail-link:focus-visible {
    background: rgba(0, 229, 255, 0.05);
    border-left-color: rgba(0, 229, 255, 0.4);
  }

  .page-privacy__rail-link[aria-current] {
    background: rgba(0, 229, 255, 0.07);
    border-left-color: var(--c-cyan);
  }

  .page-privacy__sec {
    margin-bottom: 64px;
  }

  .page-privacy__concl {
    font-size: 16px;
  }

  .page-privacy__scale {
    padding: 24px 22px;
  }
}

/* ---------- 降低动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-privacy__summary,
  .page-privacy__mark::before,
  .page-privacy__mark::after,
  .page-privacy__rail-link,
  .page-privacy__mail,
  .page-privacy__totop,
  .page-privacy__sibling {
    transition: none;
  }
}
<<<END>>>
</main>