.page-about {
  --about-soft-green: rgba(13, 43, 31, 0.6);
  --about-accent-soft: rgba(198, 255, 0, 0.16);
  --about-line: rgba(255, 255, 255, 0.08);
  --about-card-bg: rgba(30, 30, 30, 0.72);
  background: var(--bg-black);
  color: var(--white);
  overflow-x: hidden;
}

/* ===== 首屏 ===== */
.page-about-hero {
  position: relative;
  padding: 44px 0 30px;
  background: linear-gradient(165deg, var(--bg-green) 0%, var(--bg-black) 74%);
  border-bottom: 1px solid var(--about-accent-soft);
  overflow: hidden;
}

.page-about-hero::before {
  content: '';
  position: absolute;
  top: -160px;
  right: -160px;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--about-accent-soft) 0%, transparent 68%);
  pointer-events: none;
}

.page-about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding-top: 28px;
  padding-bottom: 14px;
}

.page-about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-family: var(--font-numeric);
  font-size: 0.75rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-about-hero__kicker::before {
  content: '';
  display: inline-block;
  width: 26px;
  height: 2px;
  background: var(--accent);
}

.page-about-hero__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 7vw, 4rem);
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about-hero__lead {
  max-width: 36em;
  margin: 0 0 26px;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--gray-green);
}

.page-about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about-hero__board {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 190px;
  border-radius: var(--radius-lg);
  background: var(--about-soft-green);
  border: 1px solid var(--about-accent-soft);
  overflow: hidden;
}

.page-about-hero__board-digit {
  position: relative;
  z-index: 1;
  font-family: var(--font-display);
  font-size: clamp(5rem, 16vw, 7rem);
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
  text-shadow: 0 0 48px var(--about-accent-soft);
}

.page-about-hero__board-info {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-left: 26px;
  font-family: var(--font-numeric);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.page-about-hero__board-info span:first-child {
  color: var(--gray-green);
  font-size: 0.7rem;
}

.page-about-hero__board-info strong {
  font-size: 2.4rem;
  line-height: 1;
  color: var(--white);
}

.page-about-hero__board-info span:last-child {
  color: var(--accent);
  font-size: 0.72rem;
}

/* ===== 我们是谁 ===== */
.page-about-story {
  background: linear-gradient(180deg, var(--bg-black) 0%, var(--bg-green) 140%);
}

.page-about-story__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}

.page-about-factcard {
  padding: 26px 24px 18px;
  border-radius: var(--radius-lg);
  background: var(--about-card-bg);
  border: 1px solid var(--about-line);
}

.page-about-factcard__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--about-line);
}

.page-about-factcard__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
}

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

.page-about-factcard__item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.09);
}

.page-about-factcard__item:last-child {
  border-bottom: 0;
}

.page-about-factcard__label {
  font-size: 0.88rem;
  color: var(--gray-green);
}

.page-about-factcard__value {
  font-family: var(--font-numeric);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--accent);
}

/* ===== 发展里程碑 ===== */
.page-about-milestones {
  background: linear-gradient(180deg, var(--bg-black) 0%, var(--bg-green) 170%);
}

.page-about-milestones__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 44px;
  margin-top: 30px;
}

.page-about-milestones__figure {
  margin: 0 0 30px;
}

.page-about-milestones__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
}

.page-about-milestones__caption {
  margin-top: 8px;
  font-size: 0.82rem;
  color: var(--gray-green);
}

.page-about-timeline {
  list-style: none;
  margin: 8px 0 0;
  padding: 0 0 0 8px;
  position: relative;
}

.page-about-timeline::before {
  content: '';
  position: absolute;
  left: 30px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--accent), var(--mid-green) 62%, transparent);
}

.page-about-timeline__item {
  position: relative;
  padding: 0 0 18px 76px;
}

.page-about-timeline__marker {
  position: absolute;
  left: 7px;
  top: 2px;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg-black);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px var(--about-accent-soft);
  font-family: var(--font-numeric);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--accent);
}

.page-about-timeline__card {
  display: block;
  padding: 15px 18px;
  border-radius: var(--radius-md);
  background: var(--about-card-bg);
  border: 1px solid var(--about-line);
  transition: border-color 0.25s ease;
}

.page-about-timeline__card:hover {
  border-color: rgba(198, 255, 0, 0.35);
}

.page-about-timeline__card summary {
  list-style: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.06rem;
  color: var(--white);
}

.page-about-timeline__card summary::-webkit-details-marker,
.page-about-timeline__card summary::marker {
  display: none;
}

.page-about-timeline__card summary::after {
  content: '+';
  float: right;
  font-family: var(--font-numeric);
  font-size: 1rem;
  color: var(--accent);
}

.page-about-timeline__card[open] summary::after {
  content: '–';
}

.page-about-timeline__card p {
  margin: 10px 0 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--gray-green);
}

.page-about-milestones__right {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.page-about-milestones__visual-box {
  margin: 0;
}

.page-about-milestones__visual-box img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
}

.page-about-metric {
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: var(--about-card-bg);
  border: 1px solid var(--about-line);
}

.page-about-metric__top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 12px;
}

.page-about-metric__number {
  font-family: var(--font-numeric);
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
}

.page-about-metric__label {
  font-size: 0.85rem;
  color: var(--gray-green);
}

.page-about-metric__bar {
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  overflow: hidden;
}

.page-about-metric__fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--mid-green), var(--accent));
}

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

/* ===== 服务能力 ===== */
.page-about-capability {
  background: var(--bg-green);
}

.page-about-capability__board {
  display: grid;
  gap: 12px;
  padding: 16px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-accent-soft);
  background: rgba(10, 15, 13, 0.55);
}

.page-about-capability__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about-capability__cell {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 112px;
  padding: 22px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-line);
  background: rgba(255, 255, 255, 0.03);
}

.page-about-capability__cell--accent {
  background: rgba(22, 107, 54, 0.95);
  border-color: transparent;
}

.page-about-capability__cell--full {
  min-height: auto;
}

.page-about-capability__num {
  font-family: var(--font-numeric);
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
}

.page-about-capability__cell:not(.page-about-capability__cell--accent) .page-about-capability__num {
  color: var(--white);
}

.page-about-capability__label {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--gray-green);
}

.page-about-capability__cell--accent .page-about-capability__label {
  color: rgba(255, 255, 255, 0.82);
}

.page-about-capability__desc {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--gray-green);
}

/* ===== 资质与荣誉 ===== */
.page-about-honors {
  background: var(--bg-black);
}

.page-about-honors__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about-honor {
  position: relative;
  overflow: hidden;
  padding: 28px 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-line);
  background: linear-gradient(145deg, var(--bg-card) 0%, var(--about-soft-green) 100%);
}

.page-about-honor--accent {
  border-color: rgba(198, 255, 0, 0.35);
  background: linear-gradient(145deg, rgba(22, 107, 54, 0.8) 0%, rgba(13, 43, 31, 0.92) 100%);
}

.page-about-honor__badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin-bottom: 18px;
  border-radius: 50%;
  background: var(--bg-black);
  border: 1px solid rgba(198, 255, 0, 0.4);
}

.page-about-honor__icon {
  font-size: 1.4rem;
  line-height: 1;
  color: var(--accent);
}

.page-about-honor__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
}

.page-about-honor__desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--gray-green);
}

.page-about-honor--accent .page-about-honor__desc {
  color: rgba(255, 255, 255, 0.82);
}

/* ===== 数据合作说明 ===== */
.page-about-partner {
  background: linear-gradient(160deg, var(--bg-green) 0%, var(--bg-black) 76%);
}

.page-about-partner__wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  align-items: center;
}

.page-about-partner__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 10px;
}

.page-about-partner__figure {
  margin: 0;
}

.page-about-partner__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
}

/* ===== 桌面端布局 ===== */
@media (min-width: 768px) {
  .page-about-hero__grid {
    grid-template-columns: 1.5fr 1fr;
    align-items: center;
  }

  .page-about-story__split {
    grid-template-columns: 60fr 40fr;
  }

  .page-about-milestones__split {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
  }

  .page-about-honors__grid {
    grid-template-columns: 1fr 1fr 1.2fr;
    align-items: stretch;
  }

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

@media (min-width: 680px) {
  .page-about-capability__board {
    padding: 20px;
  }

  .page-about-capability__row:nth-child(1) {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about-capability__row:nth-child(2) {
    grid-template-columns: 2fr 1fr;
  }

  .page-about-capability__row:nth-child(3) {
    grid-template-columns: 1fr;
  }

  .page-about-capability__cell--wide,
  .page-about-capability__cell--tall {
    min-height: 140px;
  }
}