/* About page */

:root {
  --about-mission-min-height: 40.75rem;
  --about-mission-mountains-height: 38.5625rem;
  --about-mission-padding-y: 7.375rem;
  --about-mission-padding-x: 6.25rem;
  --about-mission-headlines-padding-top: 1.125rem;
  --about-mission-title-gap: 0.5rem;
  --about-mission-cards-gap: 3.75rem;
  --about-mission-cards-margin-right: 6.25rem;
  --about-mission-card-width: 29.25rem;
  --about-mission-card-height: 30.625rem;
  --about-mission-card-padding: 2.125rem;
  --about-mission-card-radius: 1.75rem;
  --about-mission-card-head-gap: 1rem;
  --about-mission-card-icon-size: 6.25rem;
  --about-mission-card-text-margin-top: 2.1875rem;
}

.about-intro {
  padding: 6.875rem 0 5rem;
  background: var(--color-bg-page);
}

.about-intro__inner {
  display: flex;
  align-items: flex-start;
  gap: 3rem;
  min-width: 0;
}

.about-intro__content {
  flex: 1;
  min-width: 0;
}

.about-intro__text p {
  font-family: var(--font-family-base);
  font-size: 1.375rem;
  font-weight: 400;
  line-height: 1.85;
  color: var(--color-text-primary);
  text-align: justify;
}

.about-intro__text p + p {
  margin-top: 1rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin-top: 2.5rem;
}

.about-stats__item {
  /* padding: 28px 24px; */
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-direction: column;
  height: 7.1875rem;
  /* width: 23.4375rem; */
  padding-top: 1.5625rem;
  text-align: center;
}

.about-stats__item:nth-child(1),
.about-stats__item:nth-child(2) {
  border-bottom: 1px solid var(--color-border-light);
  padding-bottom: 1.5625rem;
  padding-top: 0;
}

.about-stats__item:nth-child(1),
.about-stats__item:nth-child(3) {
  border-right: 1px solid var(--color-border-light);
}

.about-stats__value {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.25rem;
  margin-bottom: 0.5rem;
  color: var(--color-brand-primary);
}

.about-stats__num {
  font-family: var(--font-family-base);
  font-size: 3.25rem;
  font-weight: 700;
  line-height: 1;
}

.about-stats__unit {
  font-family: var(--font-family-base);
  font-size: 1.125rem;
  font-weight: 400;
  color: var(--color-text-secondary);
}

.about-stats__label {
  font-family: var(--font-family-base);
  font-size: 1.125rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  line-height: 1.4;
}

.about-map {
  position: relative;
  flex: 0 1 54.375rem;
  width: 54.375rem;
  max-width: 100%;
  min-width: 0;
  isolation: isolate;
}

/* iOS WebKit：reveal 的 transform 会导致地图内 PNG/SVG 渲染异常 */
.about-map.reveal,
.about-map.reveal.reveal--right,
.about-map.reveal.is-visible {
  transform: none;
}

.about-map__image {
  display: block;
  width: 100%;
  height: auto;
}

.about-map__pin-wrap {
  position: absolute;
  z-index: 2;
}

.about-map__pin-bubble {
  position: absolute;
  top: calc(100% + 0.8rem);
  left: 50%;
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  min-width: 4.6875rem;
  width: max-content;
  max-width: none;
  padding: 0.4375rem 0.625rem;
  font-family: var(--font-family-base);
  font-size: 1.125rem;
  font-weight: 500;
  line-height: 1.4;
  text-align: center;
  color: var(--color-text-primary);
  white-space: nowrap;
  background: #f2f2f2;
  border-radius: 0.375rem;
  box-shadow: 0 0.125rem 0.375rem rgba(0, 0, 0, 0.08);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity 0.2s ease,
    visibility 0.2s ease;
}

.about-map__pin-bubble::before {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 0.375rem solid transparent;
  border-right: 0.375rem solid transparent;
  border-bottom: 0.375rem solid #f2f2f2;
}

.about-map__pin {
  display: block;
  width: 1.6875rem;
  height: auto;
}

.about-map__address {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: contain;
  object-position: top left;
  opacity: 0;
  pointer-events: none;
}

.about-map__pins {
  position: absolute;
}

.about-map__pins svg {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 999;
  width: 100%;
  height: 100%;
  display: block;
  opacity: 0;
  pointer-events: none;
}

.about-map__pins svg path {
  pointer-events: visiblePainted;
  cursor: pointer;
}

.about-map__pins:has(svg path:hover) .about-map__address {
  opacity: 1;
}

.about-map__pins:has(svg path:hover) .about-map__pin-bubble {
  opacity: 1;
  visibility: visible;
}

.about-map__pins:has(svg path:hover) .about-map__pin-wrap {
  z-index: 10;
}

@media (max-width: 480px) {
  .about-intro .reveal {
    transform: none;
  }

  .about-map__pins svg {
    display: none;
  }

  .about-map__pin-wrap {
    pointer-events: none;
  }

  .about-map__pin-bubble {
    left: 0;
    right: 0;
    margin-left: auto;
    margin-right: auto;
    transform: none;
  }

  .about-map__pin-bubble::before {
    left: 0;
    right: 0;
    margin-left: auto;
    margin-right: auto;
    transform: none;
  }

  .about-map__address {
    z-index: 2;
    width: 100%;
    height: 100%;
    opacity: 0 !important;
    pointer-events: auto;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
  }

  /* iOS：img opacity 切换会错位/旋转，高亮改用伪元素背景 */
  .about-map__pins::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 1;
    background-repeat: no-repeat;
    background-position: top left;
    background-size: contain;
    opacity: 0;
    pointer-events: none;
  }

  .about-map__pins--1::after {
    background-image: url("../img/about/map/xian.png");
  }

  .about-map__pins--2::after {
    background-image: url("../img/about/map/beijing.png");
  }

  .about-map__pins--3::after {
    background-image: url("../img/about/map/shenzhen.png");
  }

  .about-map__pins--4::after {
    background-image: url("../img/about/map/shanghai.png");
  }

  .about-map__pins.is-active::after,
  .about-map__pins:has(.about-map__address:hover)::after {
    opacity: 1;
  }

  .about-map__pins.is-active .about-map__pin-bubble,
  .about-map__pins:has(.about-map__address:hover) .about-map__pin-bubble {
    opacity: 1;
    visibility: visible;
  }

  .about-map__pins.is-active .about-map__pin-wrap,
  .about-map__pins:has(.about-map__address:hover) .about-map__pin-wrap {
    z-index: 10;
  }
}

/* 西安 — svg 95×167 */
.about-map__pins--1 {
  width: 5.9375rem;
  height: 10.4375rem;
  left: 28.0625rem;
  top: 15rem;
}

.about-map__pins--1 .about-map__pin-wrap {
  left: 2.875rem;
  top: 2.3125rem;
}

/* 北京 — svg 49×53 */
.about-map__pins--2 {
  width: 3.0625rem;
  height: 3.3125rem;
  left: 36.6875rem;
  top: 13.4375rem;
}

.about-map__pins--2 .about-map__pin-wrap {
  left: 0.5625rem;
  top: -0.8125rem;
}

/* 深圳 — svg 58×45 */
.about-map__pins--3 {
  width: 3.625rem;
  height: 2.8125rem;
  left: 34.4375rem;
  top: 33.125rem;
}

.about-map__pins--3 .about-map__pin-wrap {
  left: 0.75rem;
  top: -1.875rem;
}

/* 上海 — svg 31×44 */
.about-map__pins--4 {
  width: 1.9375rem;
  height: 2.75rem;
  left: 41.625rem;
  top: 23.25rem;
}

.about-map__pins--4 .about-map__pin-wrap {
  left: -0.0625rem;
  top: -1.4375rem;
}

.about-map__label {
  position: absolute;
  left: 77%;
  top: 56%;
  padding: 0.375rem 0.875rem;
  font-family: var(--font-family-base);
  font-size: 1.1875rem;
  font-weight: 500;
  color: var(--color-text-primary);
  background: var(--color-bg-page);
  border-radius: 0.25rem;
  white-space: nowrap;
  transform: translate(-50%, -100%);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.about-map__label::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--color-bg-page);
}

/* Mission section */
.about-mission {
  position: relative;
  overflow: hidden;
  min-height: var(--about-mission-min-height);
}

.about-mission__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  pointer-events: none;
}

.about-mission__bg2 {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10;
  width: 100%;
  height: var(--about-mission-mountains-height);
  object-fit: cover;
  object-position: bottom center;
  pointer-events: none;
}

.about-mission__inner {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: flex-start;
  min-height: var(--about-mission-min-height);
  padding: var(--about-mission-padding-y) var(--about-mission-padding-x);
  box-sizing: border-box;
}

.about-mission__headlines {
  padding-top: var(--about-mission-headlines-padding-top);
}

.about-mission__title {
  font-family: var(--font-family-base);
  font-size: 3.125rem;
  font-weight: 500;
  line-height: 1.2;
  color: var(--color-text-inverse);
}

.about-mission__title + .about-mission__title {
  margin-top: var(--about-mission-title-gap);
}

.about-mission__cards {
  display: flex;
  gap: var(--about-mission-cards-gap);
  margin-left: auto;
  margin-right: var(--about-mission-cards-margin-right);
}

.about-mission__card {
  position: relative;
  overflow: hidden;
  width: var(--about-mission-card-width);
  height: var(--about-mission-card-height);
  max-width: 100%;
  padding: var(--about-mission-card-padding);
  box-sizing: border-box;
  border-radius: var(--about-mission-card-radius);
}

.about-mission__card-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  pointer-events: none;
}

.about-mission__card-head {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--about-mission-card-head-gap);
}

.about-mission__card-label {
  font-family: var(--font-family-base);
  font-size: 1.875rem;
  font-weight: 500;
  line-height: 1.2;
  color: var(--color-text-inverse);
  white-space: nowrap;
}

.about-mission__card-icon {
  flex-shrink: 0;
  width: var(--about-mission-card-icon-size);
  height: var(--about-mission-card-icon-size);
  object-fit: contain;
}

.about-mission__card-text {
  position: relative;
  z-index: 1;
  margin-top: var(--about-mission-card-text-margin-top);
  font-family: var(--font-family-base);
  font-size: 1.25rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text-inverse);
  text-align: justify;
}