.page-about {
  background: #1A1A1A;
  color: #FFFFFF;
  overflow-x: hidden;
}

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

/* ========== 首屏：品牌关键词大字排版 ========== */
.page-about__hero {
  position: relative;
  background: linear-gradient(160deg, #004D2E 0%, #0B3D2E 42%, #1A1A1A 100%);
  padding: 2rem 0 0;
  overflow: hidden;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: -14%;
  width: 58vw;
  height: 100%;
  background: #FF6B00;
  opacity: 0.1;
  transform: skewX(-14deg);
  pointer-events: none;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -20%;
  width: 22rem;
  height: 26rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 48% 52% 44% 56% / 45% 42% 58% 55%;
  opacity: 0.5;
  pointer-events: none;
}

.page-about__hero .breadcrumb {
  position: relative;
  z-index: 2;
  margin-bottom: 3.5rem;
}

.page-about__hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 2.5rem;
  padding-bottom: 3.5rem;
}

.page-about__hero-copy .section__eyebrow {
  color: #FF6B00;
  margin-bottom: 0.75rem;
}

.page-about__hero-copy h1 {
  font-family: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(2rem, 5.2vw, 3.9rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -1px;
  color: #FFFFFF;
  margin: 0 0 1.25rem;
}

.page-about__hero-lead {
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.82);
  max-width: 46rem;
  margin: 0;
}

.page-about__hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.page-about__metric-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-top: 3px solid #FF6B00;
  padding: 1.1rem 0.9rem;
  transition: background 300ms ease, transform 300ms ease;
}

.page-about__metric-card:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-4px);
}

.page-about__metric-num {
  font-family: "Source Code Pro", "Roboto Mono", "Consolas", monospace;
  font-size: clamp(1.2rem, 2.4vw, 1.9rem);
  font-weight: 700;
  color: #FF6B00;
  display: block;
  margin-bottom: 0.3rem;
}

.page-about__metric-label {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.75);
}

/* ========== 品牌故事 ========== */
.page-about__story {
  background: #F5F0E8;
  color: #1A1A1A;
  padding: 3.5rem 0 5rem;
}

.page-about__story .container {
  position: relative;
}

.page-about__story-grid {
  display: grid;
  gap: 2.5rem;
  align-items: start;
}

.page-about__story-copy .section__eyebrow {
  color: #0B3D2E;
  margin-bottom: 0.5rem;
}

.page-about__story-copy h2 {
  font-family: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #004D2E;
  margin: 0 0 1.4rem;
}

.page-about__story-copy p {
  font-size: 0.92rem;
  line-height: 1.85;
  color: #3A3A3A;
  margin-bottom: 1rem;
}

.page-about__story-copy strong {
  color: #E05E00;
  font-weight: 700;
}

.page-about__story-copy .btn--ghost {
  border: 1px solid #0B3D2E;
  color: #0B3D2E;
  background: transparent;
  margin-top: 0.75rem;
}

.page-about__story-copy .btn--ghost:hover {
  background: #0B3D2E;
  color: #FFFFFF;
}

.page-about__story-visual {
  position: relative;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
}

.page-about__story-visual::before {
  content: "";
  position: absolute;
  left: -1rem;
  top: -1rem;
  width: 100%;
  height: 100%;
  border: 1px solid #0B3D2E;
  pointer-events: none;
}

.page-about__story-visual img {
  width: 100%;
  object-fit: cover;
}

.page-about__story-note {
  position: absolute;
  right: 0;
  bottom: -1.2rem;
  background: #0B3D2E;
  color: #FFFFFF;
  padding: 0.9rem 1.3rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.page-about__story-note-num {
  font-family: "Source Code Pro", "Roboto Mono", "Consolas", monospace;
  font-size: 1.4rem;
  font-weight: 700;
  color: #FF6B00;
}

.page-about__story-note span:last-child {
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

/* ========== 发展历程时间轴 ========== */
.page-about__timeline-section {
  background: #1A1A1A;
  padding: 3.5rem 0 4rem;
}

.page-about__timeline-head {
  display: grid;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.page-about__timeline-head .section__eyebrow {
  color: #FF6B00;
  margin-bottom: 0.4rem;
}

.page-about__timeline-head h2 {
  font-family: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #FFFFFF;
  margin: 0;
}

.page-about__timeline-lead {
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.68);
  max-width: 36rem;
  margin: 0;
}

.page-about__timeline {
  position: relative;
  display: grid;
  gap: 1.8rem;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, #FF6B00 0%, rgba(255, 107, 0, 0.4) 45%, rgba(46, 125, 91, 0.55) 100%);
}

.page-about__timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 0.4rem 1.2rem;
}

.page-about__timeline-dot {
  grid-column: 1;
  grid-row: 1 / span 2;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #1A1A1A;
  border: 3px solid #FF6B00;
  box-shadow: 0 0 0 2px #FF6B00;
  margin-top: 0.35rem;
  justify-self: center;
}

.page-about__timeline-year {
  grid-column: 2;
  grid-row: 1;
  font-family: "Source Code Pro", "Roboto Mono", "Consolas", monospace;
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.55);
  padding-top: 0.35rem;
}

.page-about__timeline-card {
  grid-column: 2;
  grid-row: 2;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-left: 3px solid #FF6B00;
  padding: 1rem 1.15rem;
  transition: background 300ms ease, border-color 300ms ease, transform 300ms ease;
}

.page-about__timeline-item:hover .page-about__timeline-card,
.page-about__timeline-item:focus-within .page-about__timeline-card {
  background: rgba(255, 255, 255, 0.07);
  border-color: #FF6B00;
  transform: translateY(-2px);
}

.page-about__timeline-card h3 {
  font-family: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: #FFFFFF;
  margin: 0 0 0.4rem;
}

.page-about__timeline-card p {
  font-size: 0.87rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.7);
  margin: 0;
}

/* ========== 数据与规模 ========== */
.page-about__stats-section {
  background: linear-gradient(135deg, #0B3D2E 0%, #004D2E 100%);
  padding: 3.5rem 0 4.5rem;
}

.page-about__stats-head {
  margin-bottom: 2rem;
}

.page-about__stats-head .section__eyebrow {
  color: #FFC043;
  margin-bottom: 0.4rem;
}

.page-about__stats-head h2 {
  font-family: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #FFFFFF;
  margin: 0;
}

.page-about__stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
}

.page-about__stat-card {
  position: relative;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.14);
  padding: 1.4rem 1.5rem;
  overflow: hidden;
  transition: background 300ms ease, transform 300ms ease, box-shadow 300ms ease;
}

.page-about__stat-card::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: 0;
  background: #FF6B00;
  transition: width 300ms ease;
}

.page-about__stat-card:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.page-about__stat-card:hover::after {
  width: 100%;
}

.page-about__stat-num {
  font-family: "Source Code Pro", "Roboto Mono", "Consolas", monospace;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  color: #FF6B00;
  display: block;
  line-height: 1.2;
  margin-bottom: 0.4rem;
}

.page-about__stat-label {
  font-family: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  font-size: 0.92rem;
  font-weight: 700;
  color: #FFFFFF;
  display: block;
  margin-bottom: 0.2rem;
}

.page-about__stat-desc {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.66);
}

/* ========== 团队与专业能力 ========== */
.page-about__team-section {
  background: #F5F0E8;
  color: #1A1A1A;
  padding: 3.5rem 0 4rem;
}

.page-about__team-grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

.page-about__team-copy .section__eyebrow {
  color: #0B3D2E;
  margin-bottom: 0.4rem;
}

.page-about__team-copy h2 {
  font-family: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #004D2E;
  margin: 0 0 1.2rem;
}

.page-about__team-copy p {
  font-size: 0.92rem;
  line-height: 1.85;
  color: #3A3A3A;
  margin-bottom: 1rem;
}

.page-about__team-copy strong {
  color: #E05E00;
}

.page-about__team-visual {
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.18);
}

.page-about__team-visual img {
  width: 100%;
  object-fit: cover;
}

/* ========== 资质与认可 ========== */
.page-about__credential-section {
  background: #1A1A1A;
  padding: 3.5rem 0 4rem;
}

.page-about__credential-grid {
  display: grid;
  gap: 2.5rem;
  align-items: start;
}

.page-about__credential-copy .section__eyebrow {
  color: #FF6B00;
  margin-bottom: 0.4rem;
}

.page-about__credential-copy h2 {
  font-family: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #FFFFFF;
  margin: 0 0 0.8rem;
}

.page-about__credential-copy > p {
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.7);
  max-width: 34rem;
}

.page-about__credential-list {
  list-style: none;
  margin: 1.8rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about__credential-list li {
  display: grid;
  grid-template-columns: 2.8rem 1fr;
  gap: 1rem;
  align-items: start;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-left: 3px solid #FF6B00;
  padding: 1.2rem 1.2rem;
}

.page-about__credential-mark {
  font-family: "Source Code Pro", "Roboto Mono", "Consolas", monospace;
  font-size: 1.35rem;
  font-weight: 700;
  color: #FF6B00;
  line-height: 1.2;
}

.page-about__credential-list h3 {
  font-family: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: #FFFFFF;
  margin: 0 0 0.35rem;
}

.page-about__credential-list p {
  font-size: 0.85rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.68);
  margin: 0;
}

.page-about__credential-visual {
  display: grid;
  gap: 1.2rem;
  position: sticky;
  top: 6rem;
}

.page-about__credential-visual img {
  width: 100%;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.page-about__credential-side-note {
  background: #0B3D2E;
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 1.3rem 1.4rem;
}

.page-about__credential-side-note .section__eyebrow {
  color: #FFC043;
  margin-bottom: 0.5rem;
}

.page-about__credential-side-note p:last-child {
  font-size: 0.85rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.78);
  margin: 0;
}

/* ========== 延伸入口 ========== */
.page-about__extend-section {
  padding: 0 0 4.5rem;
  background: #1A1A1A;
}

.page-about__extend-inner {
  position: relative;
  overflow: hidden;
  background: #004D2E;
  border: 1px solid rgba(255, 255, 255, 0.16);
  padding: 2.2rem 1.5rem;
}

.page-about__extend-inner::before {
  content: "";
  position: absolute;
  right: -3rem;
  top: -3rem;
  width: 10rem;
  height: 10rem;
  background: #FF6B00;
  opacity: 0.14;
  transform: rotate(45deg);
  pointer-events: none;
}

.page-about__extend-inner .section__eyebrow {
  color: #FFC043;
  margin-bottom: 0.4rem;
}

.page-about__extend-title {
  font-family: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: -0.5px;
  margin: 0 0 1.4rem;
}

.page-about__extend-links {
  display: grid;
  gap: 0.25rem;
}

.page-about__extend-links a {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #FFFFFF;
  text-decoration: none;
  font-family: "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.9rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  transition: color 200ms ease, padding-left 200ms ease;
}

.page-about__extend-links a:last-child {
  border-bottom: 0;
}

.page-about__extend-links a:hover {
  color: #FFC043;
  padding-left: 0.6rem;
}

.page-about__extend-arrow {
  font-family: "Source Code Pro", "Roboto Mono", "Consolas", monospace;
  font-size: 1.2rem;
  color: #FF6B00;
}

/* ========== 平板及以上 ========== */
@media (min-width: 640px) {
  .page-about__hero-grid {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: end;
    gap: 3rem;
  }

  .page-about__hero-metrics {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }

  .page-about__stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__story-grid,
  .page-about__team-grid,
  .page-about__credential-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
  }

  .page-about__extend-inner {
    padding: 2.8rem 2.5rem;
  }
}

/* ========== 桌面端 ========== */
@media (min-width: 1024px) {
  .page-about__hero {
    padding-top: 2.5rem;
  }

  .page-about__hero-grid {
    padding-bottom: 5rem;
  }

  .page-about__story,
  .page-about__timeline-section,
  .page-about__stats-section,
  .page-about__team-section,
  .page-about__credential-section {
    padding-top: 5rem;
    padding-bottom: 5.5rem;
  }

  /* 时间轴桌面向左向右交替 */
  .page-about__timeline {
    gap: 2rem;
  }

  .page-about__timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about__timeline-item {
    grid-template-columns: 1fr 40px 1fr;
    gap: 0 0;
  }

  .page-about__timeline-dot {
    grid-column: 2;
    grid-row: 1;
    margin-top: 1.2rem;
  }

  .page-about__timeline-year {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
    align-self: center;
    padding: 0 2.5rem 0 0;
    font-size: 1rem;
  }

  .page-about__timeline-card {
    grid-column: 3;
    grid-row: 1;
    max-width: 30rem;
  }

  .page-about__timeline-item:nth-child(even) .page-about__timeline-year {
    grid-column: 3;
    grid-row: 1;
    text-align: left;
    padding: 0 0 0 2.5rem;
  }

  .page-about__timeline-item:nth-child(even) .page-about__timeline-card {
    grid-column: 1;
    grid-row: 1;
    justify-self: end;
    border-left: 1px solid rgba(255, 255, 255, 0.09);
    border-right: 3px solid #FF6B00;
  }

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

  .page-about__story-grid {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
  }

  .page-about__credential-grid {
    grid-template-columns: 1.2fr 0.8fr;
  }

  .page-about__extend-section {
    padding-bottom: 5.5rem;
  }
}