/* =========================================================
   品牌档案 /company/ —— 页面专属样式（作用域 .page-about）
   ========================================================= */

.page-about {
  --about-cut: 14px;
  display: block;
  background: var(--ink-900);
  color: var(--text);
  font-family: var(--font-body);
}

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

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 44px) 0 clamp(36px, 5vw, 68px);
  background:
    linear-gradient(158deg, rgba(37, 225, 212, .07) 0%, rgba(10, 15, 44, 0) 46%),
    var(--ink-900);
  border-bottom: 1px solid var(--line-500);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -150px;
  right: -190px;
  width: min(720px, 94vw);
  height: min(520px, 72vw);
  background: linear-gradient(135deg, rgba(37, 225, 212, .22), rgba(37, 225, 212, 0) 66%);
  clip-path: polygon(14% 0, 100% 0, 100% 74%, 66% 100%, 0 100%, 0 22%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -170px;
  bottom: -170px;
  width: min(470px, 76vw);
  height: min(370px, 58vw);
  background: linear-gradient(45deg, rgba(255, 179, 71, .17), rgba(255, 179, 71, 0) 70%);
  clip-path: polygon(0 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(24px, 4vw, 44px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--text-dim);
}

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

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

.page-about .about-crumbs__sep {
  color: var(--line-500);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.05rem, 6.2vw, 4.15rem);
  line-height: 1.02;
  letter-spacing: -.015em;
  margin: 0 0 clamp(16px, 2.6vw, 28px);
  color: var(--text);
}

.page-about .about-hero__title-sub {
  display: block;
  margin-top: .24em;
  font-weight: 300;
  font-size: .48em;
  line-height: 1.26;
  letter-spacing: 0;
  color: var(--cyan);
}

.page-about .about-hero__lede {
  max-width: 64ch;
  margin: 0 0 clamp(26px, 4vw, 44px);
  font-size: clamp(.97rem, 1.45vw, 1.08rem);
  line-height: 1.82;
  color: var(--text-dim);
}

.page-about .about-stats {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 46px);
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-top: 1px solid var(--line-500);
  border-bottom: 1px solid var(--line-500);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 28px);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4.4vw, 2.55rem);
  line-height: 1;
  letter-spacing: .03em;
  color: var(--cyan);
}

.page-about .about-stats__label {
  font-size: .84rem;
  letter-spacing: .06em;
  color: var(--text-dim);
}

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

/* ---------- 主布局：内容 + 目录 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 34px);
}

.page-about .about-side {
  padding-top: clamp(18px, 3vw, 30px);
}

.page-about .about-flow {
  min-width: 0;
  padding-top: clamp(6px, 1.6vw, 16px);
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 216px;
    gap: clamp(30px, 4vw, 56px);
    padding-bottom: clamp(40px, 6vw, 80px);
  }

  .page-about .about-side {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
    padding-top: 0;
  }

  .page-about .about-flow {
    grid-column: 1;
    grid-row: 1;
  }
}

/* ---------- 目录 ---------- */

.page-about .about-toc {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px;
  border: 1px solid var(--line-600);
  border-radius: var(--pill);
  background: rgba(18, 26, 68, .8);
}

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

.page-about .about-toc__list {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc__item {
  flex: 0 0 auto;
}

.page-about .about-toc__link {
  display: flex;
  align-items: center;
  gap: 7px;
  min-height: 40px;
  padding: 0 14px;
  border-radius: var(--pill);
  font-size: .84rem;
  color: var(--text-dim);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-toc__idx {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--line-500);
  transition: color var(--dur) var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--text);
  background: var(--wash);
}

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

@media (min-width: 1000px) {
  .page-about .about-toc {
    display: block;
    margin-top: clamp(40px, 6vw, 78px);
    padding: 0 0 0 16px;
    border: 0;
    border-left: 1px solid var(--line-500);
    border-radius: 0;
    background: none;
  }

  .page-about .about-toc__title {
    display: block;
    margin: 0 0 14px;
    font-family: var(--font-mono);
    font-size: .7rem;
    letter-spacing: .18em;
    color: var(--text-dim);
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .about-toc__link {
    min-height: 36px;
    padding: 0 10px;
    border-radius: 4px;
    font-size: .88rem;
  }
}

/* ---------- 章节骨架 ---------- */

.page-about .about-sec {
  position: relative;
  padding-top: clamp(38px, 5.6vw, 76px);
  padding-bottom: clamp(38px, 5.6vw, 76px);
  border-top: 1px solid var(--line-500);
}

.page-about .about-flow > .about-sec:first-child {
  border-top: 0;
  padding-top: clamp(14px, 2.4vw, 26px);
}

.page-about .about-sec__head {
  margin-bottom: clamp(20px, 3vw, 36px);
}

.page-about .about-sec__no {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-about .about-sec__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.3vw, 2.25rem);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-sec__note {
  max-width: 64ch;
  margin: 0;
  font-size: .96rem;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 01 沿革 ---------- */

.page-about .about-band {
  margin: 0 0 clamp(26px, 4vw, 42px);
  background: var(--ink-800);
  border: 1px solid var(--line-600);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
  overflow: hidden;
}

.page-about .about-band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--cyan-deep) 44%, rgba(47, 59, 114, .45) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  min-width: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(37, 225, 212, .1);
}

.page-about .about-timeline__year {
  display: inline-block;
  margin: 0 0 8px;
  padding: 2px 9px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--cyan);
  background: rgba(37, 225, 212, .09);
  border: 1px solid rgba(37, 225, 212, .22);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  line-height: 1.36;
  color: var(--text);
}

.page-about .about-timeline__text {
  max-width: 68ch;
  margin: 0 0 12px;
  font-size: .94rem;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-timeline__link {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: .86rem;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(37, 225, 212, .32);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-timeline__link:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 02 栏目体系 ---------- */

.page-about .about-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .about-cols__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(12px, 1.8vw, 18px);
}

.page-about .about-card {
  position: relative;
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--ink-700);
  border: 1px solid var(--line-600);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: background var(--dur) var(--ease);
}

.page-about .about-card__idx {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1rem, 1.7vw, 1.16rem);
  line-height: 1.36;
  color: var(--text);
}

.page-about .about-card__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.76;
  color: var(--text-dim);
}

.page-about .about-card__hint {
  max-height: 5em;
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed rgba(255, 179, 71, .3);
  font-size: .81rem;
  line-height: 1.6;
  color: var(--amber);
  opacity: 1;
  overflow: hidden;
  transition: max-height var(--dur) var(--ease),
              opacity var(--dur) var(--ease),
              margin-top var(--dur) var(--ease),
              padding-top var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.page-about .about-cols__figure {
  margin: 0;
  border: 1px solid var(--line-600);
  background: var(--ink-800);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  overflow: hidden;
}

.page-about .about-cols__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

@media (min-width: 640px) {
  .page-about .about-cols__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .82fr);
    align-items: start;
  }
}

@media (hover: hover) and (min-width: 1000px) {
  .page-about .about-card:hover,
  .page-about .about-card:focus-within {
    background: var(--wash);
  }

  .page-about .about-card__hint {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    opacity: 0;
  }

  .page-about .about-card:hover .about-card__hint,
  .page-about .about-card:focus-within .about-card__hint {
    max-height: 5em;
    margin-top: 12px;
    padding-top: 10px;
    border-top-color: rgba(255, 179, 71, .3);
    opacity: 1;
  }
}

/* ---------- 03 批次编号 ---------- */

.page-about .about-code {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 38px);
  align-items: start;
}

.page-about .about-code__fig {
  margin: 0;
  padding: clamp(16px, 2.4vw, 28px);
  background: var(--ink-800);
  border: 1px solid var(--line-600);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-about .about-code__svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 700px;
  margin: 0 auto;
}

.page-about .cd-box {
  fill: rgba(37, 225, 212, .07);
  stroke: rgba(37, 225, 212, .42);
  stroke-width: 1.5;
}

.page-about .cd-val {
  font-family: var(--font-mono);
  font-size: 42px;
  letter-spacing: .04em;
  fill: var(--cyan);
  text-anchor: middle;
}

.page-about .cd-dash {
  font-family: var(--font-mono);
  font-size: 34px;
  fill: var(--line-500);
  text-anchor: middle;
}

.page-about .cd-label {
  font-family: var(--font-body);
  font-size: 19px;
  letter-spacing: .12em;
  fill: var(--text-dim);
  text-anchor: middle;
}

.page-about .about-code__body {
  min-width: 0;
}

.page-about .about-code__legend {
  list-style: none;
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-code__legend li {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(47, 59, 114, .55);
  font-size: .92rem;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .about-code__legend li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-code__tag {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-code__note {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--amber);
  font-size: .93rem;
  line-height: 1.78;
  color: var(--text);
}

@media (min-width: 860px) {
  .page-about .about-code {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }
}

/* ---------- 04 服务范围 ---------- */

.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 44px);
}

.page-about .about-coverage__block {
  min-width: 0;
}

.page-about .about-coverage__num {
  margin: 0 0 12px;
  font-size: .96rem;
  letter-spacing: .06em;
  color: var(--text);
}

.page-about .about-coverage__n {
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 6vw, 3.3rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--amber);
  margin-right: 8px;
}

.page-about .about-coverage__text {
  max-width: 52ch;
  margin: 0;
  font-size: .93rem;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-coverage__dots {
  height: 112px;
  margin-top: 20px;
  background-image: radial-gradient(circle, rgba(37, 225, 212, .5) 1.5px, transparent 1.6px);
  background-size: 20px 20px;
  -webkit-mask-image: linear-gradient(105deg, #000 0%, rgba(0, 0, 0, .55) 58%, transparent 100%);
  mask-image: linear-gradient(105deg, #000 0%, rgba(0, 0, 0, .55) 58%, transparent 100%);
}

.page-about .about-coverage__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-500);
}

.page-about .about-coverage__steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-500);
}

.page-about .about-coverage__step {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .about-coverage__steps h3 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .98rem;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-coverage__steps p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.72;
  color: var(--text-dim);
}

@media (min-width: 860px) {
  .page-about .about-coverage {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    align-items: start;
  }
}

/* ---------- 05 日常维护 ---------- */

.page-about .about-maintain {
  position: relative;
  overflow: hidden;
  margin-top: clamp(8px, 2vw, 20px);
  padding: clamp(28px, 4vw, 56px) clamp(20px, 3.2vw, 46px);
  background: var(--ink-800);
  border-top: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-maintain__bg {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-maintain__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .16;
}

.page-about .about-maintain__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-maintain__list {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 34px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 24px);
}

.page-about .about-maintain__list li {
  min-width: 0;
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-maintain__list h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-maintain__list p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.78;
  color: var(--text-dim);
}

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

@media (min-width: 720px) {
  .page-about .about-maintain__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-card__hint,
  .page-about .about-toc__link,
  .page-about .about-toc__idx,
  .page-about .about-timeline__link,
  .page-about .about-crumbs a {
    transition: none;
  }
}