/* ===== 品牌中心 ===== */
.page-about {
  --about-rail: 88px;
  --about-gap: clamp(18px, 2.4vw, 32px);
}

/* ---- 首屏 ---- */
.page-about .about-hero {
  padding: clamp(20px, 4vw, 44px) 0 clamp(26px, 4.6vw, 52px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
  align-items: end;
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

.page-about .about-hero__title {
  margin: 14px 0 clamp(16px, 2.4vw, 26px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 80px);
  line-height: 1.06;
  letter-spacing: -0.024em;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-about .about-hero__lede {
  max-width: 34em;
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--mist);
}

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

/* ---- 图片容器 ---- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure__media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, var(--layer) 0%, var(--deep) 100%);
}

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

.page-about .about-figure--hero .about-figure__media { aspect-ratio: 3 / 2; }
.page-about .about-figure--team .about-figure__media { aspect-ratio: 16 / 10; }
.page-about .about-figure--phases .about-figure__media { aspect-ratio: 12 / 5; }

.page-about .about-figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---- 规模数据条 ---- */
.page-about .about-stats {
  padding: 0 0 clamp(22px, 3.4vw, 40px);
}

.page-about .about-stats__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

@media (min-width: 760px) {
  .page-about .about-stats__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(14px, 2.2vw, 24px) clamp(12px, 1.6vw, 20px);
  background: var(--layer);
}

.page-about .about-stat__value {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(20px, 2.4vw, 30px);
  letter-spacing: 0.02em;
  color: var(--cyan);
}

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

/* ---- 纵向轴 + 内容区 ---- */
.page-about .about-layout {
  display: grid;
  gap: var(--about-gap);
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }
}

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

@media (min-width: 1000px) {
  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 116px;
    align-self: start;
  }
}

.page-about .about-rail__nav {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 8px 0;
}

.page-about .about-rail__nav::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, var(--line-strong), var(--line) 85%, transparent);
}

.page-about .about-rail__node {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--mist);
  transition: color 0.25s var(--ease);
}

.page-about .about-rail__node::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: var(--deep);
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

.page-about .about-rail__node:hover::before,
.page-about .about-rail__node:focus-visible::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-rail__node span {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
}

/* ---- 章节 ---- */
.page-about .about-section {
  padding: clamp(26px, 4vw, 52px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: none;
}

.page-about .about-section__head {
  max-width: 44em;
}

.page-about .about-section__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.012em;
  color: var(--paper);
}

.page-about .about-section__lede {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-prose {
  margin-top: clamp(16px, 2.4vw, 26px);
}

.page-about .about-prose p {
  max-width: 34em;
  margin: 0 0 16px;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.82;
  color: var(--paper);
}

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

/* ---- 团队配图 ---- */
.page-about .about-section#team .about-figure--team {
  margin-top: clamp(20px, 3vw, 32px);
}

/* ---- 筛选条 ---- */
.page-about .filter-bar {
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .filter-empty[hidden] {
  display: none;
}

.page-about .filter-empty {
  margin: 16px 0 0;
  font-size: 14px;
  color: var(--mist);
}

/* ---- 工作网格 ---- */
.page-about .about-work {
  display: grid;
  gap: 14px;
  margin-top: clamp(16px, 2.4vw, 24px);
}

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

@media (min-width: 1120px) {
  .page-about .about-work {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-card--wide {
    grid-column: span 2;
  }
}

.page-about .about-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(16px, 2vw, 24px);
  background: var(--layer);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: border-color 0.25s var(--ease);
}

.page-about .about-card:hover {
  border-color: var(--line-mid);
}

.page-about .about-card__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 1.7vw, 22px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---- 步骤卡片 ---- */
.page-about .about-step {
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color 0.25s var(--ease);
}

.page-about .about-step:hover {
  border-color: var(--line-mid);
}

.page-about .about-step--key {
  border-color: rgba(255, 138, 61, 0.32);
}

.page-about .about-step__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: clamp(16px, 2vw, 22px);
  cursor: pointer;
  list-style: none;
}

.page-about .about-step__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-step__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-step--key .about-step__idx {
  color: var(--orange);
}

.page-about .about-step__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 1.6vw, 20px);
  color: var(--paper);
}

.page-about .about-step__plus {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
  margin-left: auto;
}

.page-about .about-step__plus::before,
.page-about .about-step__plus::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-step__plus::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 1.5px;
  transform: translateY(-50%);
}

.page-about .about-step__plus::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1.5px;
  transform: translateX(-50%);
}

.page-about .about-step[open] .about-step__plus::after {
  opacity: 0;
}

.page-about .about-step__list {
  margin: 0;
  padding: 0 clamp(16px, 2vw, 22px) clamp(16px, 2vw, 22px) calc(clamp(16px, 2vw, 22px) + 34px);
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-step__list li {
  position: relative;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-step__list li::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--line-strong);
}

/* ---- 发展阶段 ---- */
.page-about .about-phases {
  display: grid;
  gap: 1px;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

@media (min-width: 860px) {
  .page-about .about-phases {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-phase {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--layer);
}

.page-about .about-phase--current {
  background: linear-gradient(180deg, rgba(255, 138, 61, 0.12) 0%, var(--layer) 62%);
  box-shadow: inset 0 1px 0 rgba(255, 138, 61, 0.4);
}

.page-about .about-phase__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-phase--current .about-phase__idx {
  color: var(--orange);
}

.page-about .about-phase h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 1.8vw, 22px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-phase p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---- 分类变更记录 ---- */
.page-about .about-record {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(18px, 2.6vw, 28px);
}

@media (min-width: 900px) {
  .page-about .about-record {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  }
}

.page-about .about-record__main p {
  max-width: 34em;
  margin: 0 0 14px;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.82;
  color: var(--paper);
}

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

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

.page-about .about-record__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  background: var(--deep);
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-record__list .mono {
  flex: none;
  min-width: 3em;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

/* ---- 覆盖与协作 ---- */
.page-about .about-reach {
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .about-reach p {
  max-width: 34em;
  margin: 0 0 16px;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.82;
  color: var(--paper);
}

.page-about .about-reach__lede {
  font-size: clamp(16px, 1.7vw, 19px) !important;
  color: var(--paper);
}

.page-about .about-reach__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: clamp(16px, 2.4vw, 24px) 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

@media (min-width: 760px) {
  .page-about .about-reach__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-reach__stats li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-reach__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(20px, 2.3vw, 28px);
  letter-spacing: 0.02em;
  color: var(--cyan-soft);
}

.page-about .about-reach__cap {
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-about .about-reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---- 下一步入口 ---- */
.page-about .about-next {
  padding: clamp(28px, 4.4vw, 56px) 0 clamp(8px, 2vw, 24px);
  border-top: 1px solid var(--line);
}

.page-about .about-next__title {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 24px);
  color: var(--paper);
}

.page-about .about-next__grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

@media (min-width: 700px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-next__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2vw, 22px);
  background: var(--layer);
  text-decoration: none;
  transition: background 0.25s var(--ease);
}

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  background: var(--console);
}

.page-about .about-next__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--cyan);
}

.page-about .about-next__desc {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}
</main>