.page-about {
  --axis-w: 172px;
  --about-gap: clamp(20px, 3.4vw, 44px);
  --about-note-w: 224px;
  padding-bottom: 92px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: clamp(18px, 2.6vw, 32px) 0 clamp(26px, 4vw, 50px);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--line-blue);
  border-radius: var(--r-card);
  background:
    linear-gradient(180deg, rgba(227, 235, 238, 0.5), rgba(251, 247, 240, 0) 64%),
    var(--paper);
  padding: clamp(20px, 3.6vw, 46px);
  box-shadow: var(--shadow-card);
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 1px solid var(--pepper);
}

.page-about .about-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
  border-top-left-radius: var(--r-card);
}

.page-about .about-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-left: 0;
  border-top: 0;
  border-bottom-right-radius: var(--r-card);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-size: clamp(26px, 4.2vw, 44px);
  line-height: 1.32;
  letter-spacing: -0.01em;
  font-weight: 700;
  color: var(--ink);
  max-width: 16em;
}

.page-about .about-hero__text {
  margin: 0 0 14px;
  font-size: 17px;
  line-height: 1.95;
  color: var(--ink-2);
  max-width: 33em;
}

.page-about .about-hero__text--quiet {
  color: var(--mist);
  font-size: 16px;
}

.page-about .about-hero__link {
  display: inline-block;
  margin-top: 6px;
  font-size: 16px;
  color: var(--pepper-deep);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  background: linear-gradient(180deg, transparent 68%, var(--fog) 68%);
  padding: 0 2px 2px;
}

.page-about .about-hero__link:hover,
.page-about .about-hero__link:focus-visible {
  background: var(--pepper-soft);
}

.page-about .about-facts {
  margin: 0;
  padding: 18px 20px 14px;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-float);
  transform: rotate(-0.8deg);
}

.page-about .about-facts__title {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 11px 0;
  border-top: 1px dashed var(--rule);
}

.page-about .about-facts__row:nth-of-type(1) {
  border-top: 0;
}

.page-about .about-facts__key {
  font-size: 14px;
  color: var(--ink-2);
}

.page-about .about-facts__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 21px;
  color: var(--ink);
  letter-spacing: 0.01em;
}

/* ---------- 分屏：刻度轴 + 叙事 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(18px, 2.6vw, 34px);
}

.page-about .about-axis__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-axis__item {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--rule);
  border-radius: var(--r-pill);
  background: var(--paper);
  color: var(--ink-2);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.page-about .about-axis__num {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-axis__item:hover,
.page-about .about-axis__item:focus-visible {
  border-color: var(--pepper);
  color: var(--ink);
  background: var(--pepper-soft);
}

/* ---------- 叙事段落 ---------- */
.page-about .about-sec {
  padding-bottom: clamp(28px, 4vw, 50px);
}

.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--rule);
  padding-top: clamp(26px, 3.6vw, 44px);
}

.page-about .about-sec__kicker {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--pepper);
}

.page-about .about-sec h2 {
  margin: 0 0 16px;
  font-size: clamp(21px, 2.6vw, 30px);
  line-height: 1.42;
  font-weight: 700;
  color: var(--ink);
  max-width: 20em;
}

.page-about .about-sec__body {
  display: grid;
  gap: 18px;
}

.page-about .about-text p {
  margin: 0 0 14px;
  font-size: 17px;
  line-height: 1.95;
  color: var(--ink-2);
  max-width: 33em;
}

.page-about .about-text p:last-child {
  margin-bottom: 0;
}

.page-about .about-text strong {
  font-weight: 700;
  color: var(--ink);
  background: linear-gradient(180deg, transparent 64%, var(--fog) 64%);
  padding: 0 1px;
}

.page-about .about-text a {
  color: var(--pepper-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 便签 ---------- */
.page-about .about-note {
  margin: 0;
  padding: 15px 16px 13px;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-card);
  transform: rotate(0.9deg);
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-note__tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--moss);
}

.page-about .about-note p {
  margin: 8px 0 0;
}

.page-about .about-note--photo {
  padding: 10px 10px 6px;
  transform: rotate(-1deg);
}

.page-about .about-note--photo img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: 4px;
}

.page-about .about-note__caption {
  margin: 0;
  padding: 10px 4px 4px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  transform: rotate(0.4deg);
}

/* ---------- 团队照片 ---------- */
.page-about .about-photo {
  margin: 22px 0 0;
}

.page-about .about-photo img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--rule);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-card);
}

.page-about .about-photo figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 通栏街景 ---------- */
.page-about .about-banner {
  margin: clamp(32px, 5vw, 64px) 0;
}

.page-about .about-banner__frame {
  position: relative;
  border: 1px solid var(--rule);
  border-radius: var(--r-card);
  overflow: hidden;
  box-shadow: var(--shadow-float);
  background: var(--fog);
}

.page-about .about-banner__frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-banner__tag {
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 6px 14px;
  border: 1px solid var(--rule);
  border-radius: var(--r-pill);
  background: rgba(251, 247, 240, 0.94);
  color: var(--ink);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.page-about .about-banner figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 三原则 ---------- */
.page-about .about-principles {
  padding: clamp(6px, 2vw, 18px) 0 clamp(38px, 5vw, 68px);
}

.page-about .about-principles h2 {
  margin: 0 0 10px;
  font-size: clamp(22px, 2.8vw, 32px);
  line-height: 1.4;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-principles__lead {
  margin: 0 0 clamp(22px, 3vw, 34px);
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-2);
  max-width: 32em;
}

.page-about .about-principles__grid {
  display: grid;
  gap: 20px;
}

.page-about .about-principle {
  border-top: 1px solid var(--line-blue);
  padding-top: 18px;
  transition: transform 0.22s cubic-bezier(0.2, 0.8, 0.2, 1);
  outline-offset: 6px;
}

.page-about .about-principle__num {
  display: block;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-principle__icon {
  width: 22px;
  height: 22px;
  display: inline-block;
  vertical-align: -4px;
  margin-right: 8px;
  color: var(--moss);
}

.page-about .about-principle h3 {
  margin: 10px 0 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-principle p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-2);
}

.page-about .about-principle__more {
  max-height: 160px;
  opacity: 1;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--rule);
  overflow: hidden;
  transition: max-height 0.24s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.24s ease,
    margin-top 0.24s ease, padding-top 0.24s ease;
}

.page-about .about-principle__more p {
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-principle:focus-visible {
  outline: 2px solid var(--pepper);
}

/* ---------- 收束 ---------- */
.page-about .about-closing {
  margin-top: clamp(28px, 4vw, 44px);
  padding: clamp(20px, 3vw, 32px);
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-card);
}

.page-about .about-closing p {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.95;
  color: var(--ink-2);
}

.page-about .about-closing p:last-child {
  margin-bottom: 0;
  color: var(--mist);
  font-size: 15px;
}

.page-about .about-closing a {
  color: var(--pepper-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 底部入口条 ---------- */
.page-about .about-dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 40;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
  padding: 10px var(--gutter) calc(10px + env(safe-area-inset-bottom));
  background: rgba(251, 247, 240, 0.95);
  border-top: 1px solid var(--rule);
  box-shadow: 0 -6px 20px rgba(27, 42, 51, 0.06);
  backdrop-filter: blur(8px);
}

.page-about .about-dock__label {
  margin-right: auto;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 窄屏不溢出 ---------- */
@media (max-width: 420px) {
  .page-about .about-text p,
  .page-about .about-hero__text {
    font-size: 16px;
  }

  .page-about .about-dock__label {
    width: 100%;
    margin: 0 0 2px;
  }

  .page-about .about-dock .btn {
    flex: 1 1 auto;
    justify-content: center;
    text-align: center;
  }
}

/* ---------- 中宽屏 ---------- */
@media (min-width: 780px) {
  .page-about .about-principles__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-dock {
    justify-content: flex-end;
    padding-right: max(var(--gutter), calc((100vw - var(--wrap)) / 2));
    padding-left: max(var(--gutter), calc((100vw - var(--wrap)) / 2));
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 248px;
  }
}

/* ---------- 分屏与纵向刻度轴 ---------- */
@media (min-width: 920px) {
  .page-about .about-split {
    grid-template-columns: var(--axis-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-axis {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-axis__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 6px 0;
    border-left: 1px solid var(--line-blue);
  }

  .page-about .about-axis__item {
    display: block;
    padding: 12px 0 12px 20px;
    border: 0;
    border-radius: 0;
    background: transparent;
    white-space: normal;
    position: relative;
  }

  .page-about .about-axis__item::before {
    content: "";
    position: absolute;
    left: -4.5px;
    top: 20px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--line-blue);
    transition: background 0.2s ease, transform 0.2s ease;
  }

  .page-about .about-axis__item:hover,
  .page-about .about-axis__item:focus-visible {
    background: transparent;
    color: var(--ink);
  }

  .page-about .about-axis__item:hover::before,
  .page-about .about-axis__item:focus-visible::before {
    background: var(--pepper);
    transform: scale(1.2);
  }

  .page-about .about-axis__num {
    display: block;
    margin-bottom: 2px;
    font-size: 15px;
    color: var(--ink);
    letter-spacing: 0.02em;
  }

  .page-about .about-axis__label {
    display: block;
    font-size: 13px;
    color: var(--mist);
  }

  .page-about .about-axis__item:hover .about-axis__num,
  .page-about .about-axis__item:focus-visible .about-axis__num {
    color: var(--pepper);
  }
}

/* ---------- 桌面：旁注靠右 ---------- */
@media (min-width: 1120px) {
  .page-about .about-sec__body {
    grid-template-columns: minmax(0, 1fr) var(--about-note-w);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-note {
    margin-top: 4px;
  }

  .page-about .about-note--photo {
    margin-top: 0;
  }
}

/* ---------- 悬停展开补充说明（仅指针设备） ---------- */
@media (min-width: 900px) and (hover: hover) {
  .page-about .about-principle__more {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
  }

  .page-about .about-principle:hover {
    transform: translateY(-2px);
  }

  .page-about .about-principle:hover .about-principle__more,
  .page-about .about-principle:focus-within .about-principle__more {
    max-height: 160px;
    opacity: 1;
    margin-top: 10px;
    padding-top: 10px;
    border-top-color: var(--rule);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-axis__item,
  .page-about .about-principle,
  .page-about .about-principle__more,
  .page-about .about-axis__item::before {
    transition: none;
  }

  .page-about .about-facts,
  .page-about .about-note,
  .page-about .about-note--photo {
    transform: none;
  }
}