/* ===== page-about · 品牌自述 ===== */

.page-about {
  --ab-rail: 9.5rem;
  --ab-hair: rgba(36, 52, 92, 0.9);
  --ab-card: #101b3b;
  overflow: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(2rem, 6vw, 4.5rem) clamp(2.4rem, 7vw, 5rem);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(36, 52, 92, 0.7) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 52, 92, 0.7) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: radial-gradient(130% 85% at 16% 4%, #000 0%, transparent 74%);
  mask-image: radial-gradient(130% 85% at 16% 4%, #000 0%, transparent 74%);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(58% 48% at 88% 4%, rgba(53, 242, 214, 0.16), transparent 72%),
    radial-gradient(52% 44% at 2% 98%, rgba(255, 138, 61, 0.13), transparent 70%);
  pointer-events: none;
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}

.page-about .ab-hero__eyebrow {
  margin: 0;
}

.page-about .ab-hero__title {
  margin: 0;
  max-width: 14ch;
  line-height: 1.02;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 48ch;
  color: var(--k1-mute);
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
  gap: 0.9rem 1.4rem;
  margin: 0;
  padding-top: 1.2rem;
  border-top: 1px solid var(--ab-hair);
}

.page-about .ab-hero__fact {
  margin: 0;
}

.page-about .ab-hero__fact dt {
  margin-bottom: 0.35rem;
  font-family: var(--k1-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--k1-mute);
}

.page-about .ab-hero__fact dd {
  margin: 0;
  font-size: 0.94rem;
  color: var(--k1-white);
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: repeat(12, 1fr);
    column-gap: 2rem;
    align-items: start;
  }

  .page-about .ab-hero__eyebrow {
    grid-column: 1 / -1;
  }

  .page-about .ab-hero__title {
    grid-column: 1 / span 9;
  }

  .page-about .ab-hero__lede {
    grid-column: 1 / span 6;
    margin-top: 0.6rem;
  }

  .page-about .ab-hero__facts {
    grid-column: 8 / span 5;
    margin-top: 0.6rem;
    padding-top: 0;
    border-top: 0;
  }
}

/* ---------- 品牌定位 ---------- */

.page-about .ab-profile__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .ab-profile__head .k1-eyebrow {
  margin-bottom: 0.7rem;
}

.page-about .ab-profile__head .k1-h2 {
  margin: 0;
}

.page-about .ab-profile__body p {
  margin: 0 0 1.1rem;
  max-width: 62ch;
  line-height: 1.85;
  color: var(--k1-mute);
}

.page-about .ab-profile__list {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 0.4rem 0 0;
  padding: 1px;
  background: var(--k1-grid);
  border: 1px solid var(--k1-grid);
}

.page-about .ab-profile__list li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.35rem;
  padding: 1rem 1.15rem;
  background: var(--k1-night);
  transition: background 0.3s ease;
}

.page-about .ab-profile__list li:hover {
  background: var(--ab-card);
}

.page-about .ab-profile__key {
  font-family: var(--k1-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--k1-cyan);
}

.page-about .ab-profile__text {
  font-size: 0.93rem;
  line-height: 1.78;
  color: var(--k1-white);
}

@media (min-width: 640px) {
  .page-about .ab-profile__list li {
    grid-template-columns: 8.5rem 1fr;
    gap: 1.2rem;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .ab-profile__grid {
    grid-template-columns: repeat(12, 1fr);
    column-gap: 2.5rem;
  }

  .page-about .ab-profile__head {
    grid-column: 1 / span 4;
  }

  .page-about .ab-profile__body {
    grid-column: 6 / span 7;
  }

  .page-about .ab-profile__list {
    grid-column: 6 / span 7;
  }
}

/* ---------- 团队 ---------- */

.page-about .ab-team__head {
  max-width: 66ch;
  margin-bottom: clamp(1.4rem, 4vw, 2.2rem);
}

.page-about .ab-team__head .k1-eyebrow {
  margin-bottom: 0.7rem;
}

.page-about .ab-team__head .k1-h2 {
  margin: 0 0 0.9rem;
}

.page-about .ab-team__lede {
  margin: 0;
  color: var(--k1-mute);
  line-height: 1.85;
}

.page-about .ab-team__media {
  margin: 0 0 clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}

.page-about .ab-team__card {
  position: relative;
  padding: 1.4rem 1.3rem 1.6rem;
  background: var(--k1-night);
  border: 1px solid var(--k1-grid);
  border-left: 2px solid var(--k1-cyan);
  transition: transform 0.35s ease, background 0.35s ease, border-color 0.35s ease;
}

.page-about .ab-team__card:nth-child(2) {
  border-left-color: var(--k1-orange);
}

.page-about .ab-team__card:nth-child(3) {
  border-left-color: var(--k1-amber);
}

.page-about .ab-team__card:hover {
  transform: translateY(-4px);
  background: var(--ab-card);
  border-color: var(--k1-hair-strong);
  border-left-color: var(--k1-cyan);
}

.page-about .ab-team__idx {
  display: block;
  font-size: 1.05rem;
  color: var(--k1-cyan);
  margin-bottom: 0.6rem;
}

.page-about .ab-team__card .k1-h3 {
  margin: 0 0 0.6rem;
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--k1-mute);
}

.page-about .ab-team__duties {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.page-about .ab-team__duties li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--k1-lineblue);
}

.page-about .ab-team__duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 0.42rem;
  height: 1px;
  background: currentColor;
}

@media (min-width: 820px) {
  .page-about .ab-team__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.4rem;
    align-items: start;
  }

  .page-about .ab-team__card:nth-child(2) {
    margin-top: 3rem;
  }

  .page-about .ab-team__card:nth-child(3) {
    margin-top: 1.2rem;
  }
}

/* ---------- 全宽色带 ---------- */

.page-about .ab-band {
  position: relative;
  margin-block: clamp(2.2rem, 6vw, 4rem);
  padding-block: clamp(2.8rem, 8vw, 5rem);
}

.page-about .ab-band--teal {
  background: var(--k1-teal);
  clip-path: polygon(0 0, 100% 2.2rem, 100% 100%, 0 calc(100% - 2.2rem));
}

.page-about .ab-band--night {
  background: var(--k1-night);
  clip-path: polygon(0 2.2rem, 100% 0, 100% calc(100% - 2.2rem), 0 100%);
  box-shadow: inset 0 1px 0 rgba(53, 242, 214, 0.16);
}

.page-about .ab-band__inner {
  display: grid;
  gap: 1rem;
}

.page-about .ab-band__label {
  margin: 0;
  font-family: var(--k1-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(242, 246, 255, 0.62);
}

.page-about .ab-band__quote {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(1.05rem, 2.4vw, 1.42rem);
  line-height: 1.66;
  font-weight: 300;
  color: var(--k1-white);
}

.page-about .ab-band__stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.7rem;
  margin: 0;
}

.page-about .ab-band__figure {
  font-size: clamp(2.6rem, 8vw, 4.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--k1-white);
}

.page-about .ab-band--teal .ab-band__figure {
  color: var(--k1-cyan);
}

.page-about .ab-band--night .ab-band__figure {
  color: var(--k1-amber);
}

.page-about .ab-band__unit {
  font-size: 0.84rem;
  letter-spacing: 0.04em;
  color: rgba(242, 246, 255, 0.72);
}

@media (min-width: 860px) {
  .page-about .ab-band__inner {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.9fr);
    column-gap: 3rem;
    align-items: end;
  }

  .page-about .ab-band__label {
    grid-column: 1 / -1;
  }

  .page-about .ab-band__stat {
    justify-content: flex-end;
    text-align: right;
  }
}

/* ---------- 版本时间线 ---------- */

.page-about .ab-timeline__head {
  max-width: 60ch;
  margin-bottom: clamp(1.4rem, 4vw, 2.2rem);
}

.page-about .ab-timeline__head .k1-eyebrow {
  margin-bottom: 0.7rem;
}

.page-about .ab-timeline__head .k1-h2 {
  margin: 0;
}

.page-about .ab-timeline__media {
  margin: 0 0 clamp(1.6rem, 4vw, 2.6rem);
}

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

.page-about .ab-tl__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  padding-block: clamp(1.6rem, 4vw, 2.6rem);
  border-top: 1px solid var(--ab-hair);
}

.page-about .ab-tl__item:last-child {
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .ab-tl__rail {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.page-about .ab-tl__num {
  font-size: 1.6rem;
  line-height: 1;
  color: var(--k1-cyan);
}

.page-about .ab-tl__label {
  font-family: var(--k1-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--k1-mute);
}

.page-about .ab-tl__body .k1-h3 {
  margin: 0 0 0.7rem;
}

.page-about .ab-tl__body p {
  margin: 0 0 1rem;
  max-width: 62ch;
  line-height: 1.85;
  color: var(--k1-mute);
}

.page-about .ab-tl__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-tl__tags li {
  font-family: var(--k1-mono);
  font-size: 0.67rem;
  letter-spacing: 0.1em;
  color: var(--k1-lineblue);
  border: 1px solid rgba(159, 216, 255, 0.28);
  border-radius: 999px;
  padding: 0.28rem 0.62rem;
}

@media (min-width: 880px) {
  .page-about .ab-tl__item {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    column-gap: 2.8rem;
  }

  .page-about .ab-tl__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.45rem;
    padding-right: 1.4rem;
    border-right: 1px solid var(--ab-hair);
  }
}

/* ---------- 合作生态 ---------- */

.page-about .ab-eco__head {
  max-width: 62ch;
  margin-bottom: clamp(1.4rem, 4vw, 2.2rem);
}

.page-about .ab-eco__head .k1-eyebrow {
  margin-bottom: 0.7rem;
}

.page-about .ab-eco__head .k1-h2 {
  margin: 0 0 0.9rem;
}

.page-about .ab-eco__lede {
  margin: 0;
  color: var(--k1-mute);
  line-height: 1.85;
}

.page-about .ab-eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--k1-grid);
  border-block: 1px solid var(--k1-grid);
}

.page-about .ab-eco__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.4rem;
  padding: 1.15rem clamp(1rem, 3vw, 1.6rem);
  background: var(--k1-void);
  transition: background 0.3s ease;
}

.page-about .ab-eco__row:hover {
  background: var(--k1-night);
}

.page-about .ab-eco__key {
  font-family: var(--k1-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--k1-orange);
}

.page-about .ab-eco__main {
  font-size: 0.94rem;
  line-height: 1.82;
  color: var(--k1-white);
}

@media (min-width: 780px) {
  .page-about .ab-eco__row {
    grid-template-columns: 9rem minmax(0, 1fr);
    gap: 2rem;
    align-items: baseline;
  }
}

.page-about .ab-eco__link {
  margin: 1.4rem 0 0;
  font-size: 0.9rem;
  color: var(--k1-mute);
}

.page-about .ab-eco__link a {
  color: var(--k1-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 214, 0.45);
  transition: border-color 0.25s ease;
}

.page-about .ab-eco__link a:hover {
  border-bottom-color: var(--k1-cyan);
}

/* ---------- 覆盖范围 ---------- */

.page-about .ab-reach__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.6rem, 4vw, 2.8rem);
}

.page-about .ab-reach__media {
  margin: 0;
  aspect-ratio: 4 / 3;
}

.page-about .ab-reach__text .k1-eyebrow {
  margin-bottom: 0.7rem;
}

.page-about .ab-reach__text .k1-h2 {
  margin: 0 0 1rem;
}

.page-about .ab-reach__text > p {
  margin: 0 0 1.4rem;
  max-width: 58ch;
  line-height: 1.85;
  color: var(--k1-mute);
}

.page-about .ab-reach__stats {
  list-style: none;
  margin: 0 0 1.4rem;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--k1-grid);
  border: 1px solid var(--k1-grid);
}

.page-about .ab-reach__stat {
  display: grid;
  gap: 0.4rem;
  padding: 1rem 1.15rem;
  background: var(--k1-night);
}

.page-about .ab-reach__figure {
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1;
  color: var(--k1-cyan);
}

.page-about .ab-reach__caption {
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--k1-mute);
}

.page-about .ab-reach__note {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--k1-mute);
}

.page-about .ab-reach__note a {
  color: var(--k1-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 214, 0.45);
}

.page-about .ab-reach__note a:hover {
  border-bottom-color: var(--k1-cyan);
}

@media (min-width: 700px) {
  .page-about .ab-reach__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 940px) {
  .page-about .ab-reach__grid {
    grid-template-columns: repeat(12, 1fr);
    column-gap: 3rem;
    align-items: center;
  }

  .page-about .ab-reach__media {
    grid-column: 1 / span 5;
  }

  .page-about .ab-reach__text {
    grid-column: 7 / span 6;
  }
}

/* ---------- 联系方式 ---------- */

.page-about .ab-contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .ab-contact__head .k1-eyebrow {
  margin-bottom: 0.7rem;
}

.page-about .ab-contact__head .k1-h2 {
  margin: 0 0 1rem;
}

.page-about .ab-contact__head p {
  margin: 0;
  max-width: 52ch;
  line-height: 1.85;
  color: var(--k1-mute);
}

.page-about .ab-contact__list {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--k1-grid);
  border: 1px solid var(--k1-grid);
}

.page-about .ab-contact__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.35rem;
  padding: 1rem 1.15rem;
  background: var(--k1-night);
}

.page-about .ab-contact__item dt {
  font-family: var(--k1-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--k1-mute);
}

.page-about .ab-contact__item dd {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--k1-white);
  word-break: break-word;
}

@media (min-width: 620px) {
  .page-about .ab-contact__item {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    gap: 1.2rem;
    align-items: baseline;
  }
}

@media (min-width: 940px) {
  .page-about .ab-contact__grid {
    grid-template-columns: repeat(12, 1fr);
    column-gap: 3rem;
    align-items: start;
  }

  .page-about .ab-contact__head {
    grid-column: 1 / span 5;
  }

  .page-about .ab-contact__list {
    grid-column: 7 / span 6;
  }
}

/* ---------- 下一步 ---------- */

.page-about .ab-next {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  padding-block: clamp(2rem, 6vw, 3.4rem);
  border-top: 1px solid var(--ab-hair);
  background:
    linear-gradient(90deg, rgba(53, 242, 214, 0.08) 0%, transparent 46%),
    var(--k1-void);
}

.page-about .ab-next__inner {
  display: grid;
  gap: 1.2rem;
}

.page-about .ab-next__lead {
  margin: 0;
  max-width: 44ch;
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  line-height: 1.7;
  color: var(--k1-white);
}

.page-about .ab-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

@media (min-width: 860px) {
  .page-about .ab-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: 2.5rem;
  }

  .page-about .ab-next__links {
    justify-content: flex-end;
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team__card,
  .page-about .ab-profile__list li,
  .page-about .ab-eco__row {
    transition: none;
  }

  .page-about .ab-team__card:hover {
    transform: none;
  }
}
</main>