/* =========================================================
   page: about / 品牌使命
   ========================================================= */

.page-about {
  --about-gap: clamp(1.5rem, 4vw, 3rem);
  --about-line-soft: rgba(183, 211, 232, .55);
  --about-deep-glow: rgba(49, 224, 208, .16);
  background: var(--c-frost);
  color: var(--c-text);
  font-family: var(--font-body);
  line-height: 1.8;
  overflow-x: hidden;
}

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

.page-about .media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-hero__media .media,
.page-about .about-history__figure .media,
.page-about .about-reach__media .media {
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--about-line-soft);
}

.page-about .about-hero__media .media {
  border-color: rgba(49, 224, 208, .32);
  box-shadow: var(--shadow-2);
}

/* ---------------- 首屏 ---------------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2.5rem, 6vw, 5rem);
  background:
    radial-gradient(115% 85% at 88% 4%, var(--about-deep-glow), transparent 60%),
    radial-gradient(90% 70% at 2% 98%, rgba(255, 159, 69, .10), transparent 62%),
    linear-gradient(168deg, var(--c-deep) 0%, var(--c-sea) 62%, #0E3760 100%);
  color: var(--c-ice);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(183, 211, 232, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(183, 211, 232, .06) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .75), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .75), transparent 78%);
  pointer-events: none;
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-hero__crumb,
.page-about .about-hero__crumb a {
  color: rgba(232, 241, 248, .72);
}

.page-about .about-hero__crumb a:hover {
  color: var(--c-neon-soft);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 4vw, 3.25rem);
  align-items: center;
}

.page-about .about-hero__kicker {
  margin: 0 0 .9rem;
  font-size: .78rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-neon);
}

.page-about .about-hero h1 {
  margin: 0 0 1.1rem;
  font-family: var(--font-title);
  font-size: clamp(1.9rem, 5.4vw, 3.4rem);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: .01em;
  color: var(--c-frost);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.6vw, 1.075rem);
  line-height: 1.85;
  color: rgba(232, 241, 248, .86);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(1.5rem, 3.5vw, 2.25rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem 1.5rem;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: .15rem;
  padding-top: .85rem;
  border-top: 1px solid rgba(183, 211, 232, .28);
}

.page-about .about-hero__num {
  font-size: clamp(1.35rem, 3vw, 1.65rem);
  font-weight: 700;
  color: var(--c-neon);
  line-height: 1.2;
}

.page-about .about-hero__unit {
  font-size: .85rem;
  color: rgba(232, 241, 248, .74);
}

.page-about .about-hero__actions {
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

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

.page-about .about-hero__media .media__label {
  color: var(--c-neon-soft);
}

/* ---------------- 通用段落 ---------------- */
.page-about .section-head h2 {
  font-family: var(--font-title);
  font-size: clamp(1.5rem, 3.4vw, 2.25rem);
  line-height: 1.32;
  margin: 0 0 .5rem;
  color: var(--c-text);
}

.page-about .prose p {
  margin: 0 0 1.1rem;
  color: var(--c-text);
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* ---------------- 使命陈述 ---------------- */
.page-about .about-mission {
  background: var(--c-frost);
}

.page-about .about-mission__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-top: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .about-mission__text {
  max-width: 68ch;
}

.page-about .about-mission__aside {
  background: var(--c-frost);
  border: 1px solid var(--about-line-soft);
  border-top: 3px solid var(--c-neon);
  border-radius: var(--radius-m);
  padding: clamp(1.25rem, 3vw, 1.85rem);
  box-shadow: var(--shadow-1);
}

.page-about .about-mission__aside-title {
  margin: 0 0 1.1rem;
  font-family: var(--font-title);
  font-size: 1.1rem;
  color: var(--c-deep);
}

.page-about .about-cases {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.15rem;
}

.page-about .about-cases__item {
  position: relative;
  padding-left: 2.5rem;
}

.page-about .about-cases__no {
  position: absolute;
  left: 0;
  top: .1rem;
  font-size: .78rem;
  font-weight: 700;
  color: var(--c-route);
  letter-spacing: .05em;
}

.page-about .about-cases__item h4 {
  margin: 0 0 .3rem;
  font-size: .98rem;
  color: var(--c-deep);
}

.page-about .about-cases__item p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--c-muted);
}

/* ---------------- 发展历程 ---------------- */
.page-about .about-history {
  background: var(--c-ice);
}

.page-about .about-history__figure {
  margin: clamp(1.5rem, 3.5vw, 2.5rem) 0 0;
}

.page-about .about-history__figure .media {
  border-color: var(--about-line-soft);
  background: linear-gradient(150deg, var(--c-route), var(--c-deep));
}

.page-about .about-history__figure .media__label {
  color: var(--c-neon-soft);
}

.page-about .media__caption {
  margin-top: .75rem;
  font-size: .85rem;
  line-height: 1.7;
  color: var(--c-muted);
}

.page-about .about-timeline {
  list-style: none;
  margin: clamp(2rem, 5vw, 3.25rem) auto 0;
  padding: 0;
  max-width: 880px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: .6rem;
  bottom: .6rem;
  width: 2px;
  background: linear-gradient(180deg, var(--c-neon) 0%, rgba(49, 224, 208, .38) 48%, rgba(183, 211, 232, .22) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(1.75rem, 4vw, 2.5rem) 2.35rem;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: .5rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-frost);
  border: 2px solid var(--c-neon);
  box-shadow: 0 0 0 4px rgba(49, 224, 208, .14);
  transition: background-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--c-neon);
  box-shadow: 0 0 0 7px rgba(49, 224, 208, .2);
}

.page-about .about-timeline__year {
  margin: 0 0 .3rem;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--c-warm);
}

.page-about .about-timeline__title {
  margin: 0 0 .45rem;
  font-family: var(--font-title);
  font-size: clamp(1.05rem, 2.2vw, 1.28rem);
  line-height: 1.45;
  color: var(--c-deep);
}

.page-about .about-timeline__summary {
  margin: 0 0 .75rem;
  max-width: 60ch;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .about-timeline__toggle {
  appearance: none;
  -webkit-appearance: none;
  background: none;
  border: 0;
  border-bottom: 1px dashed var(--c-line);
  padding: .15rem 0 .2rem;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-body);
  font-size: .86rem;
  color: var(--c-route);
  cursor: pointer;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-timeline__toggle:hover,
.page-about .about-timeline__toggle:focus-visible {
  color: var(--c-deep);
  border-bottom-color: var(--c-neon);
}

.page-about .about-timeline__chev {
  width: .52rem;
  height: .52rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translate(-1px, -1px);
  transition: transform .28s var(--ease);
}

.page-about .about-timeline__toggle[aria-expanded="true"] .about-timeline__chev {
  transform: rotate(225deg) translate(-1px, -1px);
}

.page-about .about-timeline__panel {
  margin-top: .85rem;
  padding: .9rem 1rem .95rem 1.1rem;
  background: var(--c-frost);
  border-left: 2px solid var(--c-neon);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
}

.page-about .about-timeline__panel p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.85;
  color: var(--c-muted);
}

/* ---------------- 适配体系 ---------------- */
.page-about .about-system {
  position: relative;
  overflow: hidden;
}

.page-about .about-system::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(78% 58% at 12% 8%, rgba(49, 224, 208, .15), transparent 62%),
    radial-gradient(70% 56% at 94% 92%, rgba(255, 159, 69, .10), transparent 64%);
  pointer-events: none;
}

.page-about .about-system > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-system__head h2 {
  color: var(--c-frost);
}

.page-about .about-system__lede {
  margin: .5rem 0 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(232, 241, 248, .8);
}

.page-about .about-system__tiers {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-tier {
  padding: clamp(1.2rem, 2.6vw, 1.5rem);
  border-radius: var(--radius-m);
  border: 1px solid rgba(49, 224, 208, .22);
  background: rgba(11, 42, 74, .58);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: transform .32s var(--ease), border-color .32s var(--ease), background-color .32s var(--ease);
}

.page-about .about-tier:hover {
  transform: translateY(-4px);
  border-color: rgba(49, 224, 208, .5);
  background: rgba(21, 74, 120, .6);
}

.page-about .about-tier__no {
  margin: 0 0 .7rem;
  font-size: .78rem;
  letter-spacing: .14em;
  color: var(--c-neon);
}

.page-about .about-tier h3 {
  margin: 0 0 .5rem;
  font-family: var(--font-title);
  font-size: 1.12rem;
  color: var(--c-frost);
}

.page-about .about-tier p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: rgba(232, 241, 248, .78);
}

.page-about .about-system__types {
  margin-top: clamp(2rem, 4.5vw, 3rem);
  padding-top: clamp(1.25rem, 3vw, 1.75rem);
  border-top: 1px solid rgba(183, 211, 232, .22);
}

.page-about .about-system__types-label {
  margin: 0 0 .9rem;
  font-size: .78rem;
  letter-spacing: .14em;
  color: var(--c-neon-soft);
}

.page-about .about-system__types-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
}

.page-about .about-system__types-list li {
  padding: .32rem .85rem;
  border-radius: 999px;
  border: 1px solid rgba(183, 211, 232, .3);
  font-size: .84rem;
  color: var(--c-ice);
  transition: border-color .25s var(--ease), color .25s var(--ease);
}

.page-about .about-system__types-list li:hover {
  border-color: var(--c-neon);
  color: var(--c-neon-soft);
}

/* ---------------- 服务覆盖 ---------------- */
.page-about .about-reach {
  background: var(--c-frost);
}

.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: center;
}

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

.page-about .about-reach__copy h2 {
  font-family: var(--font-title);
  font-size: clamp(1.5rem, 3.4vw, 2.25rem);
  line-height: 1.32;
  margin: .35rem 0 1.1rem;
  color: var(--c-deep);
}

.page-about .about-reach__stats {
  margin: clamp(1.5rem, 3.5vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem 1.5rem;
}

.page-about .about-reach__stat {
  padding-top: .85rem;
  border-top: 2px solid var(--c-route);
}

.page-about .about-reach__stat dt {
  font-size: .82rem;
  color: var(--c-muted);
  margin-bottom: .25rem;
}

.page-about .about-reach__stat dd {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--c-deep);
}

/* ---------------- 团队与协作 ---------------- */
.page-about .about-team {
  background: var(--c-ice);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-top: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .about-team__text {
  max-width: 68ch;
}

.page-about .about-team__numbers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.page-about .about-team__num {
  padding: 1.15rem 1rem;
  background: var(--c-frost);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--radius-m);
  transition: border-color .28s var(--ease), box-shadow .28s var(--ease);
}

.page-about .about-team__num:hover {
  border-color: var(--c-neon);
  box-shadow: var(--shadow-1);
}

.page-about .about-team__value {
  margin: 0 0 .25rem;
  font-size: clamp(1.5rem, 3.6vw, 1.9rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--c-route);
}

.page-about .about-team__label {
  margin: 0;
  font-size: .82rem;
  line-height: 1.65;
  color: var(--c-muted);
}

/* ---------------- 品质与荣誉 ---------------- */
.page-about .about-quality {
  position: relative;
  overflow: hidden;
}

.page-about .about-quality::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(85% 65% at 82% 4%, rgba(49, 224, 208, .15), transparent 60%);
  pointer-events: none;
}

.page-about .about-quality > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-quality__head h2 {
  color: var(--c-frost);
}

.page-about .about-quality__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-quality__stat {
  padding: clamp(1.4rem, 3vw, 2rem);
  border-radius: var(--radius-m);
  border: 1px solid rgba(49, 224, 208, .24);
  background: rgba(6, 26, 47, .55);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: border-color .3s var(--ease), background-color .3s var(--ease);
}

.page-about .about-quality__stat:hover {
  border-color: rgba(49, 224, 208, .52);
  background: rgba(11, 42, 74, .62);
}

.page-about .about-quality__value {
  margin: 0 0 .35rem;
  font-size: clamp(2.1rem, 6vw, 3rem);
  font-weight: 700;
  line-height: 1.05;
  color: var(--c-neon);
}

.page-about .about-quality__value small {
  font-size: .45em;
  margin-left: .12em;
  color: var(--c-neon-soft);
}

.page-about .about-quality__label {
  margin: 0 0 .5rem;
  font-family: var(--font-title);
  font-size: 1.05rem;
  color: var(--c-frost);
}

.page-about .about-quality__note {
  margin: 0;
  font-size: .86rem;
  line-height: 1.75;
  color: rgba(232, 241, 248, .7);
}

.page-about .about-quality__awards {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding-top: clamp(1.25rem, 3vw, 1.75rem);
  border-top: 1px solid rgba(183, 211, 232, .22);
}

.page-about .about-quality__awards-label {
  margin: 0 0 .9rem;
  font-size: .78rem;
  letter-spacing: .14em;
  color: var(--c-neon-soft);
}

.page-about .about-quality__awards-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .85rem;
}

.page-about .about-quality__awards-list li {
  display: flex;
  align-items: baseline;
  gap: .85rem;
  flex-wrap: wrap;
}

.page-about .about-quality__award-year {
  font-size: .84rem;
  font-weight: 700;
  color: var(--c-warm);
  letter-spacing: .08em;
}

.page-about .about-quality__award-name {
  font-size: .95rem;
  color: var(--c-ice);
}

/* ---------------- 继续了解 ---------------- */
.page-about .about-next {
  background: var(--c-ice);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  padding: clamp(1.25rem, 3vw, 1.75rem);
  background: var(--c-frost);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--radius-m);
  text-decoration: none;
  color: inherit;
  transition: transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--c-neon);
  box-shadow: var(--shadow-1);
}

.page-about .about-next__no {
  margin: 0 0 .75rem;
  font-size: .76rem;
  letter-spacing: .14em;
  color: var(--c-route);
}

.page-about .about-next__card h3 {
  margin: 0 0 .5rem;
  font-family: var(--font-title);
  font-size: 1.18rem;
  color: var(--c-deep);
}

.page-about .about-next__card p {
  margin: 0 0 1.25rem;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .about-next__more {
  margin-top: auto;
  font-size: .86rem;
  font-weight: 600;
  color: var(--c-route);
  border-bottom: 1px solid transparent;
  align-self: flex-start;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-next__card:hover .about-next__more,
.page-about .about-next__card:focus-visible .about-next__more {
  color: var(--c-deep);
  border-bottom-color: var(--c-neon);
}

/* ---------------- 断点 ---------------- */
@media (min-width: 640px) {
  .page-about .about-quality__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.15fr .85fr;
  }

  .page-about .about-mission__grid {
    grid-template-columns: 1.35fr .9fr;
    align-items: start;
  }

  .page-about .about-reach__grid {
    grid-template-columns: 1.02fr .98fr;
  }

  .page-about .about-team__grid {
    grid-template-columns: 1.25fr .95fr;
    align-items: start;
  }

  .page-about .about-team__numbers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-timeline__item {
    padding-left: 3rem;
  }

  .page-about .about-timeline::before {
    left: 9px;
  }

  .page-about .about-timeline__item::before {
    left: 3px;
    top: .6rem;
  }
}

@media (min-width: 1100px) {
  .page-about .about-system__tiers {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }
}

@media (max-width: 480px) {
  .page-about .about-hero__facts {
    grid-template-columns: 1fr;
  }

  .page-about .about-hero__actions .btn {
    width: 100%;
    text-align: center;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tier,
  .page-about .about-next__card,
  .page-about .about-timeline__chev,
  .page-about .about-timeline__item::before,
  .page-about .about-team__num {
    transition: none;
  }

  .page-about .about-tier:hover,
  .page-about .about-next__card:hover {
    transform: none;
  }
}