.page-about {
  --about-pale-gold: #E8DDB5;
}

.page-about__wrap {
  padding: 28px 0 80px;
}

.page-about__layout {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.page-about__aside {
  order: -1;
}

.page-about__main {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 64px;
}

.page-about__main::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 96px;
  height: 96px;
  background: repeating-linear-gradient(135deg, transparent 0 10px, rgba(201, 169, 97, 0.1) 10px 11px);
  pointer-events: none;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  color: var(--color-navy);
  letter-spacing: -0.01em;
}

.page-about h1 {
  font-size: 36px;
  line-height: 1.2;
  margin: 0 0 12px;
}

.page-about h2 {
  font-size: 26px;
  line-height: 1.3;
  margin: 0 0 8px;
}

.page-about h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 6px;
}

.page-about__section-head {
  margin-bottom: 20px;
}

.page-about__section-head .tag {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about__section-lead {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  color: var(--color-charcoal);
  margin: 4px 0 0;
}

.page-about figure {
  margin: 0;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about a:not(.btn) {
  color: var(--color-navy);
  text-decoration: underline;
  text-decoration-color: var(--color-gold);
  text-underline-offset: 3px;
  transition: background-color 0.2s var(--ease), text-decoration-color 0.2s var(--ease);
}

.page-about a:not(.btn):hover {
  background: rgba(255, 122, 41, 0.12);
  text-decoration-color: var(--color-orange);
}

/* ---------- 品牌定位 ---------- */

.page-about__positioning {
  position: relative;
  padding: 24px 16px 28px;
  background: rgba(245, 243, 238, 0.55);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  display: grid;
  gap: 32px;
}

.page-about__positioning::before,
.page-about__positioning::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border-color: var(--color-gold);
  border-style: solid;
  z-index: 2;
}

.page-about__positioning::before {
  top: -1px;
  left: -1px;
  border-width: 3px 0 0 3px;
}

.page-about__positioning::after {
  bottom: -1px;
  right: -1px;
  border-width: 0 3px 3px 0;
}

.page-about__overline {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-gold);
  background: var(--color-navy);
  border-radius: 3px;
  padding: 6px 12px;
  margin: 0 0 14px;
}

.page-about__lead {
  font-family: var(--font-head);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-navy);
  margin: 0 0 16px;
}

.page-about__positioning-copy > p:not(.page-about__overline):not(.page-about__lead) {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-charcoal);
  margin: 0 0 1.2em;
}

.page-about__values {
  list-style: none;
  margin: 24px 0 28px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about__values li {
  position: relative;
  padding: 16px 16px 16px 56px;
  background: var(--color-cream);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.page-about__value-num {
  position: absolute;
  top: 16px;
  left: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-navy);
  background: var(--about-pale-gold);
  border-radius: 2px;
  padding: 2px 6px;
}

.page-about__values li p {
  font-size: 15px;
  line-height: 1.6;
  margin: 0;
  color: var(--color-charcoal);
}

.page-about__positioning-figure {
  align-self: center;
}

.page-about__img {
  display: block;
  width: 100%;
  border-radius: var(--radius);
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
}

/* ---------- 里程碑时间线 ---------- */

.page-about__track {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  position: relative;
}

.page-about__track::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 10px;
  bottom: 10px;
  width: 3px;
  background: repeating-linear-gradient(to bottom, var(--color-gold) 0 6px, transparent 6px 14px);
}

.page-about__item {
  position: relative;
  padding-left: 52px;
  margin-bottom: 24px;
}

.page-about__dot {
  position: absolute;
  left: 7px;
  top: 20px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-gold);
  border: 3px solid var(--color-cream);
  box-shadow: 0 0 0 2px var(--color-gold), 0 0 0 5px rgba(201, 169, 97, 0.18);
  animation: pageAboutPulse 2.6s var(--ease) infinite;
}

@keyframes pageAboutPulse {
  0%, 100% {
    box-shadow: 0 0 0 2px var(--color-gold), 0 0 0 5px rgba(201, 169, 97, 0.18);
  }
  50% {
    box-shadow: 0 0 0 2px var(--color-gold), 0 0 0 12px rgba(201, 169, 97, 0);
  }
}

.page-about__card {
  position: relative;
  background: var(--color-cream);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about__card summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  cursor: pointer;
  min-height: 56px;
}

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

.page-about__card summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-head);
  font-size: 21px;
  font-weight: 700;
  color: var(--color-gold);
  line-height: 1;
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about__card details[open] summary::after {
  content: "−";
  color: var(--color-orange);
}

.page-about__card summary:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: -2px;
  border-radius: var(--radius);
}

.page-about__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  color: var(--color-navy);
  background: var(--about-pale-gold);
  border-radius: 2px;
  padding: 4px 8px;
  white-space: nowrap;
}

.page-about__event-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  color: var(--color-navy);
}

.page-about__detail {
  padding: 0 20px 20px;
  border-top: 1px dashed var(--color-line);
}

.page-about__detail p {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.65;
  color: var(--color-charcoal);
  margin: 14px 0 0;
}

.page-about__track-note {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-charcoal);
  margin: 8px 0 0;
}

/* ---------- 团队与规模 ---------- */

.page-about__team-figure {
  margin-bottom: 28px;
}

.page-about__team-figure img {
  display: block;
  width: 100%;
  border-radius: var(--radius);
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}

.page-about__team-grid {
  display: grid;
  gap: 28px;
}

.page-about__team-copy p {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-charcoal);
  margin: 0 0 1.2em;
}

.page-about__team-list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about__team-list li {
  position: relative;
  padding-left: 24px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-charcoal);
}

.page-about__team-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background: linear-gradient(135deg, var(--color-gold), var(--color-orange));
  transform: rotate(45deg);
}

.page-about__bars {
  display: grid;
  gap: 24px;
  align-content: start;
  padding: 24px;
  background: var(--color-cream);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.page-about__bar-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about__bar-name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  color: var(--color-navy);
}

.page-about__bar-pct {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-charcoal);
  transition: color 0.2s var(--ease);
}

.page-about__bar-track {
  height: 12px;
  border-radius: 999px;
  background: rgba(10, 31, 68, 0.08);
  overflow: hidden;
}

.page-about__bar-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  position: relative;
  transition: filter 0.2s var(--ease);
}

.page-about__bar-fill--dev {
  background: linear-gradient(90deg, var(--color-navy), var(--color-light-navy));
}

.page-about__bar-fill--ops {
  background: linear-gradient(90deg, var(--color-gold), var(--color-orange));
}

.page-about__bar-fill--dev::after,
.page-about__bar-fill--ops::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(135deg, transparent 0 10px, rgba(255, 255, 255, 0.22) 10px 12px);
}

.page-about__bar-note {
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-charcoal);
  margin: 8px 0 0;
}

.page-about__bar:hover .page-about__bar-pct {
  color: var(--color-navy);
}

.page-about__bar:hover .page-about__bar-fill {
  filter: brightness(1.06);
}

/* ---------- 服务理念 ---------- */

.page-about__philosophy-figure {
  margin-bottom: 28px;
}

.page-about__philosophy-figure img {
  display: block;
  width: 100%;
  border-radius: var(--radius);
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 32px) 0, 100% 32px, 100% 100%, 0 100%);
}

.page-about__principles {
  display: grid;
  gap: 16px;
}

.page-about__principle {
  position: relative;
  padding: 24px 20px 20px;
  background: var(--color-cream);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.page-about__principle::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-orange));
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 100%, 0 100%);
}

.page-about__principle-num {
  display: inline-block;
  background: var(--color-navy);
  color: var(--color-gold);
  padding: 3px 8px;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 12px;
}

.page-about__principle p {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.65;
  color: var(--color-charcoal);
  margin: 0;
}

.page-about__philosophy-note {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-charcoal);
  margin: 20px 0 0;
}

/* ---------- 品牌数据 ---------- */

.page-about__stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.page-about__stat {
  position: relative;
  padding: 24px 18px 20px;
  background: var(--color-cream);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about__stat::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-orange));
}

.page-about__stat-num {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 38px;
  line-height: 1;
  color: var(--color-navy);
  letter-spacing: -0.02em;
  margin: 0 0 10px;
}

.page-about__stat-num span {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-charcoal);
  margin-left: 2px;
}

.page-about__stat-label {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-charcoal);
  margin: 0;
}

.page-about__rings {
  display: grid;
  gap: 16px;
}

.page-about__ring-card {
  position: relative;
  padding: 28px 16px 20px;
  background: var(--color-cream);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
}

.page-about__ring-wrap {
  position: relative;
  display: grid;
  place-items: center;
  width: 132px;
  margin: 0 auto 12px;
}

.page-about__ring {
  grid-area: 1 / 1;
  width: 132px;
  height: 132px;
}

.page-about__ring-track {
  stroke: rgba(10, 31, 68, 0.1);
}

.page-about__ring-fill--gold {
  stroke: var(--color-gold);
}

.page-about__ring-fill--orange {
  stroke: var(--color-orange);
}

.page-about__ring-fill--navy {
  stroke: var(--color-navy);
}

.page-about__ring-num {
  grid-area: 1 / 1;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 26px;
  color: var(--color-navy);
  margin: 0;
}

.page-about__ring-num span {
  font-size: 15px;
  color: var(--color-charcoal);
}

.page-about__ring-label {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-charcoal);
  margin: 0;
}

.page-about__stats-note {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-charcoal);
  margin: 20px 0 0;
}

/* ---------- 右侧标语 ---------- */

.page-about__slogan-card {
  position: relative;
  padding: 28px 22px 24px;
  background: linear-gradient(160deg, var(--color-navy) 0%, var(--color-light-navy) 100%);
  border-radius: var(--radius);
  color: var(--color-cream);
  box-shadow: 0 20px 48px rgba(10, 31, 68, 0.3);
  overflow: hidden;
}

.page-about__slogan-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 90px;
  height: 90px;
  background: linear-gradient(135deg, transparent 50%, rgba(201, 169, 97, 0.28) 50%);
  pointer-events: none;
}

.page-about__slogan-card::after {
  content: "";
  position: absolute;
  left: -40px;
  bottom: -40px;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, rgba(255, 122, 41, 0.2) 0%, transparent 70%);
  pointer-events: none;
}

.page-about__slogan-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  margin: 0 0 14px;
}

.page-about__slogan {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 30px;
  line-height: 1.25;
  color: var(--color-cream);
  letter-spacing: -0.01em;
  margin: 0 0 18px;
}

.page-about__slogan-rule {
  width: 44px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-orange));
  margin: 0 0 18px;
}

.page-about__slogan-note {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: rgba(245, 243, 238, 0.78);
  margin: 0 0 22px;
}

.page-about__slogan-btn {
  width: 100%;
  text-align: center;
}

.page-about__slogan-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-gold);
  text-align: center;
  margin: 18px 0 0;
  opacity: 0.9;
}

/* ---------- 响应式 ---------- */

@media (min-width: 680px) {
  .page-about__stat-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__rings {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 860px) {
  .page-about__track::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about__item {
    width: calc(50% - 40px);
    padding-left: 0;
    margin-bottom: 28px;
  }

  .page-about__item--left {
    margin-left: 0;
    margin-right: auto;
    padding-right: 48px;
  }

  .page-about__item--right {
    margin-left: auto;
    margin-right: 0;
    padding-left: 48px;
  }

  .page-about__item--left .page-about__dot {
    left: auto;
    right: 31px;
  }

  .page-about__item--right .page-about__dot {
    left: 31px;
    right: auto;
  }

  .page-about__item--right .page-about__card {
    clip-path: polygon(14px 0, 100% 0, 100% 100%, 0 100%, 0 14px);
  }
}

@media (min-width: 900px) {
  .page-about__positioning {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    padding: 40px 36px 36px;
    gap: 40px;
  }

  .page-about__team-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about__principles {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1100px) {
  .page-about__layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 48px;
    align-items: start;
  }

  .page-about__aside {
    order: 1;
    position: sticky;
    top: 32px;
  }

  .page-about__slogan-card {
    padding: 32px 24px 28px;
  }

  .page-about__slogan {
    font-size: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about__dot {
    animation: none;
  }
}