/* ============================================================
   品牌档案 / 页面专属样式  ·  slug: about
   所有专属选择器均限定在 .page-about 作用域内
   ============================================================ */

.page-about {
  --ab-gutter: 20px;
  --ab-rule-dark: rgba(244, 241, 232, 0.14);
  --ab-rule-light: rgba(16, 32, 26, 0.16);
  --ab-soft: #CFD8CF;
  --ab-paper-soft: #5C6B62;
}

@media (min-width: 720px) {
  .page-about { --ab-gutter: 40px; }
}

/* ---------- 容器与分区底色 ---------- */

.page-about .ab-shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--ab-gutter);
}

.page-about .section--night { background: var(--night); color: var(--paper); }
.page-about .section--grass { background: var(--grass); color: var(--paper); }
.page-about .section--paper { background: var(--paper); color: var(--paper-ink); }

/* ---------- 首屏：档案抬头 ---------- */

.page-about .about-masthead {
  position: relative;
  background: var(--night);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: -1px;
  height: clamp(22px, 4vw, 54px);
  background: var(--paper);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  pointer-events: none;
}

.page-about .about-masthead .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 26px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-masthead .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .about-masthead .breadcrumbs a:hover { color: var(--paper); }

.page-about .about-masthead__grid {
  display: grid;
  gap: 34px;
  padding-block: 30px 96px;
}

.page-about .about-masthead h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(34px, 8vw, 74px);
  line-height: 1.04;
  letter-spacing: -0.025em;
  max-width: 14ch;
  text-wrap: balance;
}

.page-about .about-masthead__lede {
  margin: 24px 0 0;
  max-width: 48ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ab-soft);
}

/* 首屏事实栏 */

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--ab-rule-dark);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ab-rule-dark);
}

.page-about .about-facts__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 14px;
  padding: 15px 18px;
  background: var(--night);
}

.page-about .about-facts__num {
  font-size: 26px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .about-facts__text {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 通用正文块 ---------- */

.page-about .about-origin,
.page-about .about-method,
.page-about .about-nope,
.page-about .about-crew-section,
.page-about .about-promise,
.page-about .about-close {
  padding-block: 56px 62px;
}

.page-about .about-origin h2,
.page-about .about-method h2,
.page-about .about-nope h2,
.page-about .about-crew-section h2,
.page-about .about-promise h2,
.page-about .about-close h2,
.page-about .about-timeline h2 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(27px, 5.4vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 22ch;
  text-wrap: balance;
}

.page-about .about-stage h3 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(19px, 3vw, 26px);
  line-height: 1.28;
  letter-spacing: -0.01em;
}

.page-about .about-origin p,
.page-about .about-method p,
.page-about .about-stage p,
.page-about .about-close p {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.85;
  max-width: 62ch;
}

.page-about .section--paper .index-label { color: var(--paper-ink); }

/* ---------- 起点 ---------- */

.page-about .about-origin__inner { max-width: 100%; }

.page-about .about-origin__body { margin-top: 6px; }

.page-about .about-figure {
  margin: 34px 0 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--ab-rule-light);
  background: rgba(16, 32, 26, 0.04);
}

.page-about .section--night .about-figure,
.page-about .section--grass .about-figure {
  border-color: var(--ab-rule-dark);
  background: rgba(244, 241, 232, 0.04);
}

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

.page-about .about-figure figcaption {
  padding: 12px 16px 14px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--ab-paper-soft);
}

.page-about .section--night .about-figure figcaption,
.page-about .section--grass .about-figure figcaption {
  color: var(--mist);
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline { padding-block: 58px 66px; }

.page-about .about-timeline__layout {
  display: grid;
  gap: 26px;
  margin-top: 36px;
}

/* 刻度轨道（移动端：横向胶囊条） */

.page-about .about-ticks {
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--ab-rule-dark);
}

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

.page-about .about-ticks__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
}

.page-about .about-tick {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 13px;
  border: 1px solid var(--ab-rule-dark);
  border-radius: 999px;
  font-size: 12.5px;
  letter-spacing: 0.05em;
  white-space: nowrap;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-tick:hover { color: var(--paper); }

.page-about .about-tick__bar {
  display: inline-block;
  width: 12px;
  height: 2px;
  background: var(--ab-rule-dark);
  transition: width 0.28s ease, background 0.28s ease;
}

.page-about .about-tick[aria-current="true"] {
  color: var(--paper);
  border-color: rgba(200, 255, 77, 0.45);
}

.page-about .about-tick[aria-current="true"] .about-tick__bar {
  width: 24px;
  background: var(--lime);
}

/* 阶段条目 */

.page-about .about-stage {
  position: relative;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--ab-rule-dark);
}

.page-about .about-stage + .about-stage { padding-top: 30px; }
.page-about .about-stage:last-child { border-bottom: 0; padding-bottom: 0; }

.page-about .about-stage p { color: var(--ab-soft); }

@media (min-width: 880px) {

  .page-about .about-timeline__layout {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-ticks {
    position: sticky;
    top: 104px;
    overflow: visible;
    border-bottom: 0;
    padding-bottom: 0;
  }

  .page-about .about-ticks__list {
    flex-direction: column;
    gap: 2px;
    padding: 0;
  }

  .page-about .about-tick {
    width: 100%;
    padding: 9px 0;
    border: 0;
    border-radius: 0;
    font-size: 12px;
    letter-spacing: 0.08em;
  }

  .page-about .about-tick__bar { width: 14px; }
  .page-about .about-tick[aria-current="true"] .about-tick__bar { width: 30px; }

  .page-about .about-origin,
  .page-about .about-method,
  .page-about .about-nope,
  .page-about .about-crew-section,
  .page-about .about-promise,
  .page-about .about-close,
  .page-about .about-timeline { padding-block: 88px 96px; }

  .page-about .about-masthead__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.9fr);
    gap: 56px;
    align-items: end;
    padding-block: 42px 132px;
  }

  .page-about .about-masthead__lede { font-size: 17px; }
  .page-about .about-facts__num { font-size: 30px; }
}

/* ---------- 团队剖面 ---------- */

.page-about .about-crew-lede {
  margin: 16px 0 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ab-soft);
}

.page-about .about-crew {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 34px;
}

.page-about .about-crew__block {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "num name"
    "num duty";
  align-items: center;
  column-gap: 18px;
  row-gap: 4px;
  padding: 16px 18px;
  border: 1px solid var(--ab-rule-dark);
  border-radius: 10px;
  background: var(--grass);
  transition: transform 0.28s ease, border-color 0.28s ease, background 0.28s ease;
}

.page-about .about-crew__num {
  grid-area: num;
  align-self: start;
  font-size: 32px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime);
}

.page-about .about-crew__name {
  grid-area: name;
  margin: 0;
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.page-about .about-crew__duty {
  grid-area: duty;
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
  transition: color 0.28s ease;
}

.page-about .about-crew__block:hover,
.page-about .about-crew__block:focus-within {
  transform: translateY(-3px);
  border-color: rgba(200, 255, 77, 0.4);
  background: var(--midline);
}

.page-about .about-crew__block:hover .about-crew__duty,
.page-about .about-crew__block:focus-within .about-crew__duty {
  color: var(--paper);
}

@media (min-width: 820px) {

  .page-about .about-crew {
    flex-direction: row;
    align-items: stretch;
    gap: 6px;
  }

  .page-about .about-crew__block {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "num"
      "name"
      "duty";
    align-content: start;
    gap: 9px;
    column-gap: 0;
    padding: 24px 16px 28px;
    min-width: 0;
  }

  .page-about .about-crew__block--edit { flex: 7 1 0; }
  .page-about .about-crew__block--data { flex: 4 1 0; }
  .page-about .about-crew__block--tech { flex: 5 1 0; }
  .page-about .about-crew__block--care { flex: 2 1 0; }

  .page-about .about-crew__num { font-size: 40px; }
  .page-about .about-crew__name { font-size: 16px; }
  .page-about .about-crew__duty { font-size: 12.5px; line-height: 1.6; }
}

/* ---------- 编辑方法 ---------- */

.page-about .about-method__grid {
  display: grid;
  gap: 34px;
}

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

.page-about .about-checks {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: ab-check;
  display: grid;
  gap: 22px;
}

.page-about .about-checks__item {
  position: relative;
  padding-left: 52px;
  counter-increment: ab-check;
}

.page-about .about-checks__item::before {
  content: "0" counter(ab-check);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--midline);
}

.page-about .about-checks__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 32px;
  height: 1px;
  background: var(--ab-rule-light);
}

.page-about .about-checks__title {
  margin: 0;
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.page-about .about-checks__item p {
  margin: 8px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
}

/* 暖橙旁注 */

.page-about .about-note {
  margin: 32px 0 0;
  padding: 16px 0 16px 18px;
  border-left: 2px solid var(--amber);
  background: rgba(255, 138, 61, 0.07);
  border-radius: 0 8px 8px 0;
  max-width: 60ch;
}

.page-about .about-note__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-note p + p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: #3A4A42;
}

.page-about .about-method__figure { margin-top: 6px; }

@media (min-width: 900px) {

  .page-about .about-method__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-method__figure {
    margin-top: 78px;
    position: sticky;
    top: 104px;
  }
}

/* ---------- 不做的事 ---------- */

.page-about .about-nope__list {
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--ab-rule-dark);
  border-top: 1px solid var(--ab-rule-dark);
  border-bottom: 1px solid var(--ab-rule-dark);
}

.page-about .about-nope__item {
  padding: 22px 0 24px;
  background: var(--grass);
}

.page-about .about-nope__mark {
  margin: 0;
  font-size: clamp(18px, 2.6vw, 22px);
  font-weight: 500;
  letter-spacing: -0.005em;
}

.page-about .about-nope__mark::before {
  content: "";
  display: inline-block;
  width: 20px;
  height: 2px;
  margin-right: 12px;
  vertical-align: 6px;
  background: var(--amber);
}

.page-about .about-nope__item p + p {
  margin: 10px 0 0;
  padding-left: 32px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-soft);
}

@media (min-width: 860px) {

  .page-about .about-nope__list {
    grid-template-columns: 1fr;
    margin-top: 40px;
  }

  .page-about .about-nope__item {
    display: grid;
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 1.38fr);
    gap: 36px;
    align-items: baseline;
    padding: 26px 0 28px;
  }

  .page-about .about-nope__item p + p {
    margin-top: 0;
    padding-left: 0;
  }
}

/* ---------- 更新节奏 ---------- */

.page-about .about-promise__lede {
  margin: 16px 0 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ab-soft);
}

.page-about .about-rhythm {
  margin: 34px 0 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--ab-rule-dark);
}

.page-about .about-rhythm__row {
  display: grid;
  gap: 8px;
  padding: 20px 0 22px;
  border-bottom: 1px solid var(--ab-rule-dark);
}

.page-about .about-rhythm__when {
  margin: 0;
  font-size: 20px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--lime);
}

.page-about .about-rhythm__what {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ab-soft);
}

@media (min-width: 760px) {

  .page-about .about-rhythm__row {
    grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
    gap: 40px;
    align-items: baseline;
    padding: 24px 0 26px;
  }

  .page-about .about-rhythm__when { font-size: 24px; }
}

/* ---------- 收束 ---------- */

.page-about .about-close__grid {
  display: grid;
  gap: 34px;
}

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

.page-about .about-next {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.page-about .about-close__figure { margin-top: 0; }

@media (min-width: 900px) {

  .page-about .about-close__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 60px;
    align-items: center;
  }

  .page-about .about-next { margin-top: 36px; }
}

/* ---------- 滚动显现（渐进增强） ---------- */

.has-js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.35s ease, transform 0.35s ease;
}

.has-js .page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 减弱动效 ---------- */

@media (prefers-reduced-motion: reduce) {

  .has-js .page-about [data-reveal],
  .has-js .page-about [data-reveal].is-visible {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .page-about .about-crew__block,
  .page-about .about-tick,
  .page-about .about-tick__bar {
    transition: none !important;
  }

  .page-about .about-crew__block:hover { transform: none; }
  .page-about .about-ticks { scroll-behavior: auto; }
}