/* ============================================
   品牌历程 /history/ —— 页面专属样式
   ============================================ */

.page-about {
  --about-ink-soft: #2A3B58;
  --about-rail-w: 152px;
  background-color: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
}

.page-about .about-lead .container,
.page-about .about-body .container,
.page-about .about-outro .container {
  position: relative;
}

/* ---------- 刊头 ---------- */

.page-about .about-lead {
  position: relative;
  padding: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(2.25rem, 5vw, 3.75rem);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(31, 224, 206, .16), transparent 62%),
    radial-gradient(90% 80% at 4% 108%, rgba(255, 106, 31, .13), transparent 60%),
    var(--ink-900);
  border-bottom: 1px solid var(--line-faint);
  overflow: hidden;
}

.page-about .about-lead::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(44, 74, 115, .34) 1px, transparent 1px),
    linear-gradient(90deg, rgba(44, 74, 115, .34) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 82%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 82%);
  opacity: .62;
}

.page-about .breadcrumb__list {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  list-style: none;
  margin: 0 0 clamp(1.5rem, 4vw, 2.5rem);
  padding: 0;
  font-size: .79rem;
  color: var(--mist);
}

.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: .5rem;
  color: var(--line);
}

.page-about .breadcrumb__list a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb__list a:hover,
.page-about .breadcrumb__list a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumb__list [aria-current="page"] {
  color: var(--paper);
}

.page-about .about-lead__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-lead__title {
  margin: 0;
  font-size: clamp(2.1rem, 7.6vw, 4.2rem);
  line-height: 1.03;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .about-lead__lede {
  margin: clamp(1.1rem, 2.5vw, 1.6rem) 0 0;
  max-width: 40rem;
  color: var(--mist);
  font-size: clamp(1rem, 1.15vw, 1.08rem);
  line-height: 1.85;
}

/* 三组规模数字 */

.page-about .about-figures {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--cyan);
}

.page-about .about-figure {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: clamp(.9rem, 2vw, 1.4rem);
  align-items: center;
  padding: clamp(.85rem, 2vw, 1.05rem) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-figure__num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 5vw, 2.35rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .about-figure__label {
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-figure__note {
  font-size: .78rem;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 通栏主图 ---------- */

.page-about .about-hero {
  margin: 0;
  border-radius: 0;
}

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

.page-about .about-hero .media__caption {
  padding-inline: var(--gutter);
}

/* ---------- 双栏正文骨架 ---------- */

.page-about .about-body {
  padding: clamp(2.5rem, 6vw, 5rem) 0 clamp(2rem, 5vw, 4rem);
}

.page-about .about-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.page-about .about-rail {
  display: none;
}

/* ---------- 章节 ---------- */

.page-about .about-sec {
  position: relative;
  padding-top: clamp(2rem, 4.5vw, 3rem);
  border-top: 1px solid var(--line-faint);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec + .about-sec {
  margin-top: clamp(2.25rem, 5vw, 3.75rem);
}

.page-about .about-sec__head {
  margin-bottom: clamp(1.25rem, 3vw, 1.9rem);
}

.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(1.6rem, 4vw, 2.45rem);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-sec__intro {
  margin: .85rem 0 0;
  max-width: 36rem;
  color: var(--mist);
  font-size: .96rem;
  line-height: 1.85;
}

/* 引言 */

.page-about .about-pull {
  margin: 0 0 clamp(1.5rem, 3vw, 2.2rem);
  padding: .12rem 0 .12rem 1.1rem;
  border-left: 3px solid var(--orange);
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 2.4vw, 1.32rem);
  line-height: 1.7;
  color: var(--paper);
}

/* 版本时间轴 */

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: clamp(1.6rem, 3.5vw, 2.4rem);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: .5rem;
  bottom: .5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--amber) 52%, var(--orange));
  opacity: .55;
}

.page-about .about-tl__item {
  position: relative;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: .34rem;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border: 2px solid var(--cyan);
  background: var(--ink-900);
  transform: rotate(45deg);
}

.page-about .about-tl__item--now::before {
  border-color: var(--orange);
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 31, .18);
}

.page-about .about-tl__ver {
  display: inline-block;
  margin: 0 0 .55rem;
  padding: .18rem .6rem;
  font-family: var(--font-mono);
  font-size: .73rem;
  letter-spacing: .12em;
  color: var(--ink-900);
  background: var(--cyan);
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 100%, 0 100%);
}

.page-about .about-tl__ver--now {
  background: var(--orange);
}

.page-about .about-tl__title {
  margin: 0 0 .5rem;
  font-size: clamp(1.06rem, 2.6vw, 1.32rem);
  font-weight: 700;
  line-height: 1.42;
  color: var(--paper);
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 38rem;
  font-size: .95rem;
  line-height: 1.88;
  color: var(--mist);
}

/* ---------- 纸感区块通用 ---------- */

.page-about .about-sec--paper {
  border-top-color: transparent;
  background: var(--paper);
  color: var(--about-ink-soft);
  padding: clamp(1.4rem, 3.5vw, 2.4rem) clamp(1.25rem, 3.5vw, 2.4rem);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}

.page-about .about-sec--paper .about-sec__title,
.page-about .about-sec--paper .about-step__title,
.page-about .about-sec--paper .about-credo__title {
  color: var(--ink-900);
}

.page-about .about-sec--paper .eyebrow {
  color: var(--ink-700);
}

.page-about .about-sec--paper .about-sec__intro,
.page-about .about-sec--paper .about-step__text,
.page-about .about-sec--paper .about-credo__text,
.page-about .about-sec--paper .media__caption {
  color: var(--about-ink-soft);
}

.page-about .about-sec__media {
  margin: 0 0 clamp(1.3rem, 3vw, 1.9rem);
}

/* 内容生产四步 */

.page-about .about-steps {
  list-style: none;
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(1.1rem, 2.5vw, 1.6rem);
}

.page-about .about-step {
  padding-top: .9rem;
  border-top: 2px solid rgba(10, 23, 48, .16);
}

.page-about .about-step__no {
  display: block;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--red);
}

.page-about .about-step__title {
  margin: .32rem 0 .45rem;
  font-size: 1.04rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink-900);
}

.page-about .about-step__text {
  margin: 0;
  font-size: .91rem;
  line-height: 1.82;
  color: var(--about-ink-soft);
}

/* ---------- 数据区块 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.4rem, 3vw, 2.4rem);
}

.page-about .about-split__body p {
  margin: 0 0 1rem;
  font-size: .96rem;
  line-height: 1.88;
  color: var(--mist);
}

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

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

.page-about .about-metrics {
  list-style: none;
  margin: clamp(1.7rem, 3.5vw, 2.5rem) 0 0;
  padding: 0;
  border-top: 2px solid var(--cyan);
}

.page-about .about-metric {
  display: grid;
  grid-template-columns: minmax(5.5rem, auto) minmax(0, 1fr);
  gap: .3rem clamp(1rem, 3vw, 2rem);
  align-items: baseline;
  padding: .85rem 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-metric__k {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.6vw, 1.24rem);
  font-weight: 700;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-metric__v {
  font-size: .87rem;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 团队区块（深底切角） ---------- */

.page-about .about-sec--deck {
  border-top-color: transparent;
  background: var(--ink-700);
  padding: clamp(1.4rem, 3.5vw, 2.4rem) clamp(1.25rem, 3.5vw, 2.4rem);
  clip-path: polygon(28px 0, 100% 0, 100% 100%, 0 100%, 0 28px);
}

.page-about .about-team {
  list-style: none;
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding: 0;
}

.page-about .about-team__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .25rem;
  padding: .85rem 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-team__role {
  font-size: .88rem;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: .02em;
}

.page-about .about-team__desc {
  font-size: .9rem;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 表达原则 ---------- */

.page-about .about-credo {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(1.1rem, 2.5vw, 1.6rem);
}

.page-about .about-credo__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .3rem clamp(.9rem, 2vw, 1.3rem);
  padding-top: .9rem;
  border-top: 2px solid rgba(10, 23, 48, .16);
}

.page-about .about-credo__no {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--red);
}

.page-about .about-credo__title {
  margin: 0;
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink-900);
}

.page-about .about-credo__text {
  margin: .3rem 0 0;
  font-size: .91rem;
  line-height: 1.82;
  color: var(--about-ink-soft);
}

/* ---------- 合作与反馈 ---------- */

.page-about .about-channels {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--cyan);
}

.page-about .about-channel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .4rem;
  padding: clamp(1rem, 2.5vw, 1.35rem) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-channel__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--cyan);
}

.page-about .about-channel__text {
  margin: 0;
  font-size: .93rem;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-channel__text a {
  color: var(--paper);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 3px;
  transition: color var(--dur) var(--ease);
}

.page-about .about-channel__text a:hover,
.page-about .about-channel__text a:focus-visible {
  color: var(--cyan);
}

.page-about .about-mail {
  display: inline-block;
  padding: .08rem .42rem;
  font-family: var(--font-mono);
  font-size: .87rem;
  color: var(--paper);
  background: rgba(31, 224, 206, .1);
  border-bottom: 1px solid var(--cyan);
}

/* ---------- 收束条 ---------- */

.page-about .about-outro {
  padding: clamp(2rem, 5vw, 3.25rem) 0;
  border-top: 1px solid var(--line-soft);
  background:
    linear-gradient(90deg, rgba(31, 224, 206, .14), rgba(255, 106, 31, .14)),
    var(--ink-800);
}

.page-about .about-outro__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.1rem, 3vw, 1.8rem);
}

.page-about .about-outro__text {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 2.4vw, 1.34rem);
  line-height: 1.62;
  color: var(--paper);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ============================================
   响应式
   ============================================ */

@media (min-width: 760px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(1.2rem, 2.5vw, 1.8rem) clamp(1.5rem, 3vw, 2.4rem);
  }

  .page-about .about-team__item {
    grid-template-columns: minmax(7rem, 11rem) minmax(0, 1fr);
    gap: .3rem clamp(1rem, 2.5vw, 1.8rem);
    align-items: baseline;
  }

  .page-about .about-channel {
    grid-template-columns: minmax(8rem, 13rem) minmax(0, 1fr);
    gap: clamp(1rem, 3vw, 2rem);
    align-items: baseline;
  }

  .page-about .about-outro__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.16fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-credo {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(1.3rem, 3vw, 2rem) clamp(1.8rem, 4vw, 3rem);
  }
}

@media (min-width: 960px) {
  .page-about .about-lead__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(280px, 1fr);
    align-items: end;
    gap: clamp(2rem, 5vw, 4.5rem);
  }
}

@media (min-width: 1040px) {
  .page-about .about-body__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-about .about-rail {
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 108px;
    padding-top: .3rem;
  }
}

/* ---------- 窄栏目录 ---------- */

.page-about .about-rail__title {
  margin: 0 0 .9rem;
  padding-left: .9rem;
  font-family: var(--font-mono);
  font-size: .71rem;
  letter-spacing: .24em;
  color: var(--mist);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
}

.page-about .about-rail__link {
  display: block;
  margin-left: -1px;
  padding: .55rem 0 .55rem .9rem;
  border-left: 2px solid transparent;
  color: var(--mist);
  text-decoration: none;
  transition:
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-about .about-rail__link .num {
  display: block;
  font-family: var(--font-mono);
  font-size: .69rem;
  letter-spacing: .16em;
  color: var(--cyan-deep);
}

.page-about .about-rail__label {
  display: block;
  margin-top: .16rem;
  font-size: .89rem;
  color: inherit;
}

.page-about .about-rail__kw {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: .71rem;
  line-height: 1.5;
  color: var(--cyan);
  transition: opacity var(--dur) var(--ease), max-height var(--dur) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--cyan);
  background-color: rgba(31, 224, 206, .06);
}

.page-about .about-rail__link:hover .about-rail__kw,
.page-about .about-rail__link:focus-visible .about-rail__kw {
  opacity: 1;
  max-height: 2.6rem;
  margin-top: .18rem;
}

.page-about .about-rail__scale {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-top: 1.7rem;
  padding-left: .9rem;
}

.page-about .about-rail__scale span {
  display: block;
  height: 2px;
  width: 42%;
  background: var(--line);
}

.page-about .about-rail__scale span:nth-child(4n + 1) {
  width: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--cyan-deep));
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}