/* ===== 品牌档案 / 页面专属样式 ===== */
.page-about {
  --about-rail-w: 208px;
  --about-gap: clamp(26px, 4.2vw, 52px);
  --about-phase-ink: #1F3652;
  --about-phase-celadon: #5F9182;
  --about-phase-cinnabar: #B8392B;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-sans);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(148deg, var(--ink) 0%, var(--ink) 52%, var(--ink-deep) 100%);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  padding: clamp(118px, 15vw, 178px) var(--gutter) clamp(46px, 6.5vw, 82px);
  color: var(--paper);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -24%;
  right: -14%;
  width: min(620px, 82vw);
  aspect-ratio: 1;
  background: radial-gradient(circle at 34% 34%, rgba(184, 57, 43, 0.55), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -8%;
  bottom: -32%;
  width: min(760px, 110vw);
  height: 62%;
  background: linear-gradient(120deg, rgba(31, 54, 82, 0.9), rgba(217, 180, 74, 0.12));
  transform: rotate(-7deg);
  border-radius: var(--radius-xl);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--shell);
  margin-inline: auto;
}

.page-about .about-crumb {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-crumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-crumb__item + .about-crumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(143, 166, 191, 0.6);
}

.page-about .about-crumb__link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-crumb__link:hover,
.page-about .about-crumb__link:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.page-about .about-crumb__item--current {
  color: var(--paper);
  font-weight: 600;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(33px, 6.2vw, 74px);
  line-height: 1.14;
  letter-spacing: clamp(1.5px, 0.42vw, 4.5px);
  color: var(--paper);
  max-width: 15em;
}

.page-about .about-hero__title em {
  display: block;
  font-style: normal;
  color: var(--gold);
}

.page-about .about-hero__lead {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 36em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: rgba(245, 241, 232, 0.84);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 14px;
  margin: clamp(30px, 4.5vw, 48px) 0 0;
  padding: clamp(20px, 3vw, 26px) 0 0;
  border-top: 1px solid rgba(217, 180, 74, 0.34);
  list-style: none;
}

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

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(24px, 3.4vw, 36px);
  letter-spacing: 0.06em;
  color: var(--gold);
  line-height: 1;
}

.page-about .about-stat__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(34px, 5vw, 64px) var(--gutter) clamp(56px, 8vw, 96px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-rail {
  align-self: start;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--muted);
}

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

.page-about .rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  background: var(--paper-2);
  color: var(--ink-2);
  font-size: 13.5px;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cinnabar);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-2px);
}

.page-about .rail-link:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

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

/* ---------- 章节头 ---------- */
.page-about .about-section {
  margin-bottom: clamp(50px, 7vw, 86px);
  scroll-margin-top: 96px;
}

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

.page-about .about-section--airy {
  margin-bottom: clamp(64px, 9.5vw, 118px);
}

.page-about .about-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 16px;
  margin-bottom: clamp(18px, 2.6vw, 28px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--paper-2);
}

.page-about .about-head__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 3.1vw, 33px);
  letter-spacing: 0.04em;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-lede {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.9;
  color: var(--ink-2);
}

/* ---------- 01 流程 ---------- */
.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 40px);
}

.page-about .about-flow__line {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: 14px;
}

.page-about .about-flow__path {
  fill: none;
  stroke: var(--gold);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .about-flow__dot {
  fill: var(--cinnabar);
}

.page-about .about-steps {
  margin: 0;
  padding: 0 0 0 18px;
  list-style: none;
  border-left: 2px solid var(--paper-2);
}

.page-about .about-step {
  position: relative;
  padding: 0 0 clamp(20px, 2.8vw, 28px) clamp(14px, 2vw, 20px);
}

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

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 9px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--gold);
}

.page-about .about-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--cinnabar);
  margin-bottom: 5px;
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-about .about-step__text {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 32em;
}

.page-about .about-step__owner {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--celadon);
  border: 1px solid rgba(95, 145, 130, 0.42);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
}

.page-about .about-flow__media {
  margin: 0;
  align-self: start;
}

.page-about .about-flow__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  object-fit: cover;
  box-shadow: 0 16px 34px rgba(14, 27, 44, 0.16);
}

.page-about .about-flow__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 02 岗位 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .role-card {
  position: relative;
  background: var(--paper-2);
  border-radius: var(--radius-lg);
  padding: clamp(18px, 2.6vw, 26px);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.page-about .role-card:hover {
  transform: translateY(-4px);
  background: #EFEADE;
  box-shadow: 0 14px 28px rgba(14, 27, 44, 0.12);
}

.page-about .role-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(28px, 3.6vw, 38px);
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--cinnabar);
}

.page-about .role-card__name {
  margin: 10px 0 10px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--ink);
}

.page-about .role-card__text {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .role-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-2);
  background: rgba(217, 180, 74, 0.24);
  border-radius: var(--radius-pill);
  padding: 4px 11px;
}

/* ---------- 03 版本演进 ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  border-radius: var(--radius-xl);
  padding: clamp(24px, 4vw, 48px);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  pointer-events: none;
}

.page-about .about-phases {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .phase {
  position: relative;
  display: flex;
  gap: 0;
  background: var(--paper);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.page-about .phase:hover {
  transform: translateX(6px);
  box-shadow: -6px 0 0 0 var(--gold);
}

.page-about .phase__band {
  flex: 0 0 7px;
  background: var(--gold);
}

.page-about .phase--ink .phase__band {
  background: var(--about-phase-ink);
}

.page-about .phase--celadon .phase__band {
  background: var(--about-phase-celadon);
}

.page-about .phase--cinnabar .phase__band {
  background: var(--about-phase-cinnabar);
}

.page-about .phase__body {
  padding: clamp(18px, 2.6vw, 26px);
  min-width: 0;
}

.page-about .phase__era {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--ink-2);
  background: var(--paper-2);
  border-radius: var(--radius-pill);
  padding: 3px 11px;
  margin-bottom: 12px;
}

.page-about .phase__title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.3vw, 22px);
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--ink);
}

.page-about .phase__text {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 40em;
}

.page-about .phase__meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--celadon);
}

/* ---------- 04 长期做法 ---------- */
.page-about .about-rules {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .rule {
  position: relative;
  padding: clamp(18px, 2.6vw, 26px) 0 clamp(18px, 2.6vw, 26px) 0;
  border-top: 1px solid var(--paper-2);
}

.page-about .rule:last-child {
  border-bottom: 1px solid var(--paper-2);
}

.page-about .rule__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--gold);
  margin-bottom: 8px;
}

.page-about .rule__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2.1vw, 20px);
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.page-about .rule__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.88;
  color: var(--muted);
  max-width: 36em;
}

/* ---------- 05 归档 ---------- */
.page-about .about-archive {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 38px);
  align-items: start;
}

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

.page-about .about-archive__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  object-fit: cover;
}

.page-about .about-archive__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-archive__text > p {
  margin: 0 0 20px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink-2);
  max-width: 34em;
}

.page-about .about-ways {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .way {
  background: var(--paper-2);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  border-left: 3px solid var(--gold);
}

.page-about .way__link {
  display: inline-block;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--cinnabar);
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 57, 43, 0.35);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .way__link:hover,
.page-about .way__link:focus-visible {
  color: var(--cinnabar-deep);
  border-bottom-color: var(--cinnabar-deep);
}

.page-about .way__link:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.page-about .way__text {
  margin: 7px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-archive__note {
  margin: 0 0 22px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
  padding: 14px 16px;
  background: rgba(95, 145, 130, 0.1);
  border-radius: var(--radius-md);
}

.page-about .about-cta {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  background: var(--cinnabar);
  color: var(--paper);
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-cta:hover {
  background: var(--cinnabar-deep);
  transform: translateY(-2px);
}

.page-about .about-cta:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

/* ---------- 窄屏到桌面 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(30px, 4.4vw, 58px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    padding-top: 6px;
  }

  .page-about .about-rail__label {
    margin-bottom: 14px;
  }

  .page-about .rail-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
    border-left: 1px solid var(--paper-2);
  }

  .page-about .rail-link {
    border-radius: 0 var(--radius-pill) var(--radius-pill) 0;
    background: transparent;
    padding: 9px 14px 9px 16px;
    color: var(--muted);
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    background: var(--paper-2);
    color: var(--ink);
    transform: translateX(3px);
  }

  .page-about .about-flow {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    gap: clamp(28px, 3.6vw, 46px);
    align-items: start;
  }

  .page-about .about-flow__media {
    margin-top: 26px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .role-card:nth-child(even) {
    margin-top: 22px;
  }

  .page-about .about-rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 3.6vw, 44px);
  }

  .page-about .rule:nth-last-child(2) {
    border-bottom: 1px solid var(--paper-2);
  }

  .page-about .about-archive {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1fr);
    gap: clamp(26px, 3.6vw, 44px);
  }
}

@media (min-width: 1120px) {
  .page-about .about-hero__lead {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    transform: none !important;
  }
}