.page-about {
  --about-line: rgba(240, 235, 216, 0.14);
  --about-line-strong: rgba(240, 235, 216, 0.28);
  --about-orange: #FF5A2B;
  --about-lime: #C6F24E;
  --about-teal: #1E5E5A;
  position: relative;
}

.page-about .tk-container {
  position: relative;
  z-index: 1;
}

/* ===== 封面区 ===== */
.page-about__cover {
  position: relative;
  padding-top: 30px;
  padding-bottom: 52px;
}

.page-about__cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(240, 235, 216, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(240, 235, 216, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.page-about__cover-grid {
  display: grid;
  gap: 36px;
}

.page-about__cover-copy {
  max-width: 820px;
}

.page-about__cover-copy h1 {
  font-family: var(--font-head);
  font-size: clamp(2rem, 4.6vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: 0.01em;
  margin: 14px 0 18px;
}

.page-about__cover-lead {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--c-fg);
  opacity: 0.86;
  max-width: 64ch;
  margin: 0;
}

.page-about__cover-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about__cover-meta .tk-meta {
  border: 1px solid var(--about-line);
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}

.page-about__cover-index {
  border-left: 1px solid var(--about-line);
  padding-left: 24px;
  max-width: 420px;
}

.page-about__index-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--c-muted);
  margin: 0 0 12px;
}

.page-about__toc {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about__toc li + li {
  border-top: 1px solid var(--about-line);
}

.page-about__toc a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 0;
  color: var(--c-fg);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--dur) var(--ease);
}

.page-about__toc a:hover,
.page-about__toc a:focus-visible {
  color: var(--about-orange);
}

.page-about__toc-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-muted);
  transition: color var(--dur) var(--ease);
}

.page-about__toc a:hover .page-about__toc-num,
.page-about__toc a:focus-visible .page-about__toc-num {
  color: var(--about-lime);
}

@media (min-width: 860px) {
  .page-about__cover-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about__cover-index {
    margin-top: 48px;
  }
}

/* ===== 品牌起源 ===== */
.page-about__origin-grid {
  display: grid;
  gap: 36px;
  margin-top: 30px;
}

.page-about__origin-copy p {
  line-height: 1.8;
  margin: 0 0 16px;
  font-size: 1rem;
}

.page-about__origin-copy .tk-notes {
  margin-top: 20px;
}

.page-about__origin-figure {
  margin: 0;
}

.page-about__origin-figure .tk-visual {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  position: relative;
}

.page-about__origin-figure .tk-visual__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

@media (min-width: 900px) {
  .page-about__origin-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
    align-items: center;
  }
}

/* ===== 发展里程碑 ===== */
.page-about__milestones {
  position: relative;
}

.page-about__milestones::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(240, 235, 216, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(240, 235, 216, 0.04) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}

.page-about__timeline {
  position: relative;
  margin-top: 28px;
}

.page-about__milestone {
  position: relative;
  display: grid;
  gap: 12px;
  padding: 24px 0;
  border-top: 1px solid var(--about-line);
}

.page-about__milestone-marker {
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
}

.page-about__milestone-year {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--about-lime);
}

.page-about__milestone-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--about-orange);
  box-shadow: 0 0 0 4px rgba(255, 90, 43, 0.18);
  flex: 0 0 auto;
}

.page-about__milestone-copy h3 {
  font-family: var(--font-head);
  font-size: 1.4rem;
  margin: 0 0 8px;
  letter-spacing: 0.02em;
}

.page-about__milestone-copy p {
  line-height: 1.75;
  margin: 0;
  max-width: 58ch;
  color: var(--c-fg);
  opacity: 0.86;
}

.page-about__milestone-data {
  margin: 0;
  padding: 14px 16px;
  display: grid;
  gap: 12px;
  align-self: stretch;
}

.page-about__data-item {
  display: grid;
  gap: 2px;
}

.page-about__data-item dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--c-muted);
}

.page-about__data-item dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--c-fg-light);
}

@media (min-width: 860px) {
  .page-about__milestone {
    grid-template-columns: 120px minmax(0, 1fr) minmax(220px, 260px);
    column-gap: 28px;
    align-items: start;
    padding: 28px 0;
  }

  .page-about__milestone-marker {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .page-about__milestone-marker::after {
    content: "";
    position: absolute;
    left: 6px;
    top: 32px;
    bottom: -32px;
    width: 1px;
    background: var(--about-line);
  }

  .page-about__milestone:last-child .page-about__milestone-marker::after {
    display: none;
  }

  .page-about__milestone-data {
    margin-top: 2px;
  }
}

/* ===== 核心能力 ===== */
.page-about__stats-grid {
  margin-top: 32px;
}

.page-about__stat-card {
  min-height: 170px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.page-about__stat-num {
  font-family: var(--font-head);
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1;
  color: var(--about-orange);
  display: block;
  margin-bottom: 8px;
}

.page-about__stat-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--c-muted);
  display: block;
  margin-bottom: 10px;
}

.page-about__capability-detail {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about__capacity-block {
  position: relative;
  border-left: 3px solid var(--about-orange);
}

.page-about__capacity-block--lime {
  border-left-color: var(--about-lime);
}

.page-about__capacity-block--teal {
  border-left-color: var(--about-teal);
}

.page-about__capacity-block h3 {
  font-family: var(--font-head);
  font-size: 1.2rem;
  margin: 0 0 8px;
}

.page-about__capacity-block p {
  line-height: 1.7;
  margin: 0;
}

@media (min-width: 860px) {
  .page-about__capability-detail {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ===== 团队与组织 ===== */
.page-about__team {
  position: relative;
}

.page-about__team::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(240, 235, 216, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(240, 235, 216, 0.04) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}

.page-about__team-grid {
  display: grid;
  gap: 36px;
  margin-top: 30px;
}

.page-about__team-figure {
  margin: 0;
}

.page-about__team-figure .tk-visual {
  aspect-ratio: 7 / 5;
  overflow: hidden;
}

.page-about__team-figure .tk-visual__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about__team-info > p:first-child {
  line-height: 1.8;
  margin-top: 0;
}

.page-about__team-faq {
  margin-top: 8px;
}

.page-about__team-faq details {
  border-bottom: 1px solid var(--about-line);
}

.page-about__team-faq summary {
  cursor: pointer;
  padding: 15px 8px 15px 0;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--c-fg-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: color var(--dur) var(--ease);
}

.page-about__team-faq summary:hover,
.page-about__team-faq summary:focus-visible {
  color: var(--about-lime);
}

.page-about__team-faq summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--about-lime);
  line-height: 1;
  transition: transform var(--dur) var(--ease);
}

.page-about__team-faq details[open] summary::after {
  transform: rotate(45deg);
}

.page-about__team-faq details p {
  margin: 0 0 16px;
  line-height: 1.75;
  padding-right: 8px;
  color: var(--c-fg);
  opacity: 0.86;
}

.page-about__team-note {
  margin-top: 18px;
  padding: 12px 14px;
  border: 1px solid var(--about-line-strong);
  background: rgba(22, 42, 68, 0.45);
}

@media (min-width: 900px) {
  .page-about__team-grid {
    grid-template-columns: minmax(0, 42%) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
}

/* ===== 资质与荣誉 ===== */
.page-about__credentials {
  position: relative;
}

.page-about__credentials::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(29, 28, 24, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29, 28, 24, 0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}

.page-about__credential-grid {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-about__credential-card {
  position: relative;
  background: rgba(249, 245, 232, 0.72);
  border: 1px solid rgba(29, 28, 24, 0.12);
  padding: 26px 24px;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about__credential-card:hover,
.page-about__credential-card:focus-within {
  border-color: rgba(29, 28, 24, 0.42);
  box-shadow: 6px 6px 0 rgba(29, 28, 24, 0.1);
}

.page-about__credential-card h3 {
  font-family: var(--font-head);
  font-size: 1.3rem;
  color: var(--c-bg);
  margin: 14px 0 8px;
}

.page-about__credential-card p {
  color: rgba(29, 28, 24, 0.78);
  line-height: 1.7;
  margin: 0;
}

.page-about__credential-figure {
  margin: 32px 0 0;
}

.page-about__credential-figure .tk-visual {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  max-width: 820px;
}

.page-about__credential-figure .tk-visual__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about__credentials .tk-figure__caption {
  color: var(--c-bg);
}

@media (min-width: 860px) {
  .page-about__credential-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ===== 合作生态 ===== */
.page-about__ecosystem .tk-grid {
  margin-top: 32px;
}

.page-about__eco-card {
  min-height: 190px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
}

.page-about__eco-card h3 {
  font-family: var(--font-head);
  font-size: 1.15rem;
  margin: 0;
}

.page-about__eco-card p {
  line-height: 1.7;
  margin: 0;
  color: var(--c-muted);
  font-size: 0.95rem;
}

.page-about__eco-card::after {
  content: "";
  display: block;
  width: 28px;
  height: 3px;
  background: var(--about-orange);
  margin-top: auto;
  transition: width var(--dur) var(--ease);
}

.page-about__eco-card:hover::after,
.page-about__eco-card:focus-within::after {
  width: 48px;
  background: var(--about-lime);
}

.page-about__eco-card:nth-child(2)::after {
  background: var(--about-lime);
}

.page-about__eco-card:nth-child(3)::after {
  background: var(--about-teal);
}

.page-about__eco-card:nth-child(4)::after {
  background: var(--c-bronze);
}

/* ===== 结尾 CTA ===== */
.page-about__next-panel {
  padding: 40px clamp(20px, 5vw, 64px);
  background: var(--c-fg-light);
  border: 1px solid rgba(29, 28, 24, 0.1);
  box-shadow: 8px 8px 0 rgba(255, 90, 43, 0.35);
  position: relative;
}

.page-about__next-panel .tk-section__title {
  color: var(--c-bg);
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 0 0 12px;
}

.page-about__next-panel .tk-section__intro {
  color: rgba(29, 28, 24, 0.7);
  margin: 0 0 28px;
  max-width: 56ch;
}

.page-about__next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ===== 移动端窄屏安全 ===== */
.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .tk-grid,
.page-about .tk-grid--2,
.page-about .tk-grid--3,
.page-about .tk-grid--4 {
  min-width: 0;
}

.page-about .tk-card,
.page-about .tk-panel,
.page-about .tk-glass {
  min-width: 0;
}