/* ===== 品牌使命 / about ===== */
.page-about {
  background: var(--ink);
  color: var(--paper);
  padding-bottom: clamp(64px, 10vw, 128px);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: clamp(20px, 3vw, 36px);
  margin-bottom: clamp(28px, 5vw, 56px);
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--stone);
}

.page-about .breadcrumb a {
  color: var(--stone);
  text-decoration: none;
  transition: color 200ms var(--ease);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: clamp(44px, 7vw, 88px);
}

.page-about .about-hero .eyebrow {
  margin: 0 0 14px;
  color: var(--stone);
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 15ch;
}

.page-about .about-hero-split {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(28px, 4vw, 52px);
}

@media (min-width: 900px) {
  .page-about .about-hero-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

.page-about .about-hero-text p {
  margin: 0 0 1em;
  max-width: 48ch;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(237, 232, 220, .8);
}

.page-about .about-hero-text .lead {
  max-width: 50ch;
  font-size: clamp(17px, 1.5vw, 19px);
  color: var(--paper);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-mark {
  position: relative;
  width: 100%;
  max-width: 320px;
  aspect-ratio: 1 / 1;
  margin-left: auto;
  border: var(--rule);
  background-color: var(--deep);
  background-image: repeating-linear-gradient(90deg, transparent 0 23px, rgba(62, 92, 75, .4) 23px 24px);
  display: grid;
  place-items: center;
  overflow: hidden;
  box-shadow: var(--shadow-hard);
}

.page-about .mark-q {
  font-family: var(--font-display);
  font-size: clamp(88px, 12vw, 148px);
  font-weight: 700;
  line-height: .8;
  color: var(--stone);
  transform: rotate(-7deg) translateY(-6px);
}

@supports (-webkit-text-stroke: 2px #000) {
  .page-about .mark-q {
    color: transparent;
    -webkit-text-stroke: 2px var(--stone);
  }
}

.page-about .mark-strike {
  position: absolute;
  left: 0;
  right: 0;
  top: 52%;
  height: 3px;
  background: var(--answer);
  box-shadow: 0 0 14px rgba(79, 240, 208, .55);
}

.page-about .mark-caption {
  position: absolute;
  right: 10px;
  bottom: 14px;
  writing-mode: vertical-rl;
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--stone);
}

/* ---------- 主体：左侧章节轴 + 右侧内容 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(32px, 5vw, 64px);
  margin-top: clamp(24px, 4vw, 48px);
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 88px);
    align-items: start;
  }
}

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

@media (min-width: 1024px) {
  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 128px;
  }
}

.page-about .rail-title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .34em;
  color: var(--stone);
  text-transform: uppercase;
}

.page-about .rail-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .rail-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(to bottom, var(--answer), rgba(79, 240, 208, .14) 72%, transparent);
}

.page-about .rail-list a {
  position: relative;
  display: block;
  padding: 11px 0 11px 28px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--stone);
  text-decoration: none;
  transition: color 220ms var(--ease);
}

.page-about .rail-list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 1px solid var(--moss);
  transition: background 220ms var(--ease), border-color 220ms var(--ease);
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  color: var(--paper);
}

.page-about .rail-list a:hover::before,
.page-about .rail-list a:focus-visible::before {
  background: var(--answer);
  border-color: var(--answer);
}

.page-about .rail-num {
  font-family: var(--font-num);
  font-size: 11px;
  color: rgba(138, 143, 139, .8);
  margin-right: 7px;
}

.page-about .about-flow {
  display: grid;
  min-width: 0;
}

.page-about .about-cols > *,
.page-about .about-body > *,
.page-about .index-grid > *,
.page-about .about-flow > * {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  position: relative;
  padding-top: clamp(40px, 6vw, 84px);
  scroll-margin-top: 140px;
}

.page-about .about-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: min(62%, 360px);
  height: 12px;
  background: var(--deep);
  clip-path: polygon(0 0, 100% 0, calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-flow > .about-section:first-child {
  padding-top: 0;
}

.page-about .about-flow > .about-section:first-child::before {
  display: none;
}

.page-about .about-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  margin-bottom: clamp(22px, 3vw, 40px);
  padding-top: 18px;
  background-image: linear-gradient(var(--answer), var(--answer));
  background-size: 64px 2px;
  background-repeat: no-repeat;
  background-position: 0 0;
}

.page-about .about-head .chapter-num {
  font-family: var(--font-display);
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 700;
  line-height: .9;
  letter-spacing: .04em;
  color: var(--stone);
  font-variant-numeric: tabular-nums;
}

@supports (-webkit-text-stroke: 1px #000) {
  .page-about .about-head .chapter-num {
    color: transparent;
    -webkit-text-stroke: 1.2px var(--stone);
  }
}

.page-about .about-head h2 {
  margin: 0;
  flex: 1 1 260px;
  min-width: 0;
}

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

@media (min-width: 1180px) {
  .page-about .about-annotation {
    display: block;
    position: absolute;
    right: 0;
    top: clamp(48px, 6vw, 96px);
    writing-mode: vertical-rl;
    font-family: var(--font-display);
    font-size: 11px;
    letter-spacing: .34em;
    color: rgba(138, 143, 139, .55);
  }
}

/* ---------- 正文 ---------- */
.page-about .about-prose {
  max-width: 58ch;
}

.page-about .about-prose p {
  margin: 0 0 1.1em;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(237, 232, 220, .84);
}

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

.page-about .about-lede {
  max-width: 60ch;
  margin: 0 0 clamp(24px, 3vw, 40px);
  font-size: clamp(17px, 1.5vw, 19px);
  line-height: 1.78;
  color: rgba(237, 232, 220, .9);
}

/* ---------- 图文双栏 ---------- */
.page-about .about-cols {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

@media (min-width: 860px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
  }
  .page-about .about-cols--flip {
    grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr);
  }
}

.page-about .about-figure {
  margin: 0;
  border: var(--rule);
  background: var(--deep);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  filter: saturate(.92) contrast(1.06);
}

.page-about .about-caption {
  padding: 12px 16px;
  border-top: 1px solid rgba(62, 92, 75, .85);
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--stone);
}

/* ---------- 流程步骤 ---------- */
.page-about .step-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--rule);
  counter-reset: about-step;
}

.page-about .step-list li {
  position: relative;
  counter-increment: about-step;
  padding: clamp(18px, 2.6vw, 26px) 0 clamp(18px, 2.6vw, 26px) clamp(46px, 5vw, 68px);
  border-bottom: var(--rule);
}

.page-about .step-list li::before {
  content: "0" counter(about-step);
  position: absolute;
  left: 0;
  top: clamp(18px, 2.6vw, 26px);
  font-family: var(--font-num);
  font-size: 20px;
  letter-spacing: .06em;
  color: var(--answer);
}

.page-about .step-list h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .step-list p {
  margin: 0;
  max-width: 50ch;
  font-size: 15.5px;
  line-height: 1.72;
  color: rgba(237, 232, 220, .78);
}

/* ---------- 团队分工 ---------- */
.page-about .role-list {
  list-style: none;
  margin: clamp(26px, 3vw, 40px) 0 0;
  padding: 0;
  border-top: var(--rule);
  display: grid;
}

@media (min-width: 720px) {
  .page-about .role-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 56px);
  }
}

.page-about .role-list li {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 12px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(62, 92, 75, .7);
}

.page-about .role-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .role-count {
  font-family: var(--font-num);
  font-size: 14px;
  color: var(--answer);
  font-variant-numeric: tabular-nums;
}

.page-about .role-desc {
  grid-column: 1 / -1;
  font-size: 14px;
  line-height: 1.65;
  color: var(--stone);
}

/* ---------- 覆盖量级索引 ---------- */
.page-about .index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 2px;
  background: rgba(62, 92, 75, .9);
  border: var(--rule);
}

.page-about .index-cell {
  display: grid;
  gap: 6px;
  align-content: start;
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--deep);
}

.page-about .index-num {
  font-family: var(--font-num);
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1;
  color: var(--answer);
  font-variant-numeric: tabular-nums;
}

.page-about .index-label {
  font-size: 15px;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .index-note {
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 阶段时间轴 ---------- */
.page-about .stage-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .stage-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 18px;
  width: 2px;
  background: linear-gradient(to bottom, var(--answer) 0%, rgba(79, 240, 208, .35) 42%, rgba(62, 92, 75, .4) 100%);
}

.page-about .stage-item {
  position: relative;
  padding: 0 0 clamp(26px, 3.6vw, 42px) 36px;
}

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

.page-about .stage-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 16px;
  height: 16px;
  background: var(--ink);
  border: 2px solid var(--answer);
}

.page-about .stage-tag {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 9px;
  border: 1px solid var(--clay);
  color: var(--clay);
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .12em;
}

.page-about .stage-item h3 {
  margin: 0 0 8px;
  font-size: 18px;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .stage-item p {
  margin: 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.74;
  color: rgba(237, 232, 220, .8);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(56px, 9vw, 120px);
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  padding: clamp(26px, 4vw, 52px);
  border: var(--rule);
  background: var(--deep);
  box-shadow: var(--shadow-hard);
}

@media (min-width: 820px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

.page-about .about-cta .eyebrow {
  margin: 0 0 10px;
  color: var(--stone);
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.72;
  color: rgba(237, 232, 220, .8);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 无障碍与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

@media (max-width: 520px) {
  .page-about .about-mark {
    max-width: 100%;
  }

  .page-about .about-head {
    background-size: 48px 2px;
  }

  .page-about .step-list li {
    padding-left: 42px;
  }
}