.page-about {
  --about-rail-w: 220px;
  --about-notes-w: 260px;
  --about-ink-soft: #3C4753;
  --about-shade: rgba(14, 42, 66, 0.06);
}

/* ---------- 首屏 ---------- */
.page-about .about-mast {
  padding-top: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(32px, 5vw, 64px);
  position: relative;
}

.page-about .about-mast::after {
  content: "";
  display: block;
  height: 1px;
  margin-top: clamp(28px, 4vw, 48px);
  background: var(--sand);
}

.page-about .about-title {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(2rem, 6.2vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--deep);
  margin: 14px 0 0;
  max-width: 18em;
}

.page-about .about-title__line {
  display: block;
}

.page-about .about-title__line--shift {
  color: var(--clay);
  padding-left: clamp(0px, 6vw, 84px);
}

.page-about .about-lede {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.6vw, 1.16rem);
  line-height: 1.9;
  color: var(--about-ink-soft);
  max-width: 33em;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--sand);
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 14px 2px;
  border-bottom: 1px solid var(--sand);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3.4vw, 1.9rem);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--clay);
  min-width: 4.5em;
  letter-spacing: 0.02em;
}

.page-about .about-fact__label {
  font-family: var(--font-sans);
  font-size: 0.92rem;
  color: var(--deep);
  line-height: 1.5;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: clamp(40px, 6vw, 76px) 0;
  border-top: 1px solid var(--sand);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: clamp(24px, 3vw, 40px);
}

.page-about .about-sec__intro {
  margin-top: 4px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .prose {
  font-family: var(--font-serif);
  color: var(--about-ink-soft);
  max-width: 34em;
  margin-bottom: 1.1em;
}

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

.page-about .about-note {
  margin-top: clamp(20px, 3vw, 32px);
  background: var(--paper-dim);
  border-left: 2px solid var(--clay);
  padding: 14px 18px;
  max-width: 40em;
}

.page-about .about-note p {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.75;
  letter-spacing: 0.01em;
  color: var(--deep);
  margin: 0;
}

/* ---------- 01 起点 ---------- */
.page-about .origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .origin-media {
  border: 1px solid var(--sand);
  box-shadow: 6px 6px 0 var(--about-shade);
}

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

/* ---------- 02 时间线 ---------- */
.page-about .vtl {
  list-style: none;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .vtl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--clay) 0%, var(--sky) 55%, var(--jade) 100%);
  opacity: 0.5;
}

.page-about .vtl__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 0 0 clamp(28px, 4vw, 44px) 30px;
}

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

.page-about .vtl__marker {
  display: flex;
  align-items: center;
  gap: 10px;
  position: absolute;
  left: 0;
  top: 4px;
}

.page-about .vtl__dot {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--clay);
  flex: none;
}

.page-about .vtl__dot--now {
  background: var(--orange);
  border-color: var(--clay-deep);
  box-shadow: 0 0 0 4px rgba(242, 103, 34, 0.16);
}

.page-about .vtl__year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--clay);
  position: absolute;
  left: 24px;
  white-space: nowrap;
}

.page-about .vtl__body {
  padding-left: 0;
}

.page-about .vtl__item--current .vtl__body {
  background: rgba(242, 178, 51, 0.1);
  border: 1px solid rgba(166, 58, 40, 0.24);
  padding: clamp(16px, 2.4vw, 24px);
  box-shadow: 6px 6px 0 var(--about-shade);
}

.page-about .vtl__title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: clamp(1.12rem, 2.2vw, 1.46rem);
  line-height: 1.35;
  color: var(--deep);
  margin: 0 0 10px;
}

.page-about .vtl__text {
  font-family: var(--font-serif);
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--about-ink-soft);
  margin: 0;
  max-width: 34em;
}

.page-about .vtl__toggle {
  margin-top: 12px;
  background: none;
  border: 1px solid var(--sky);
  color: var(--sky);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  padding: 6px 14px;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.page-about .vtl__toggle:hover,
.page-about .vtl__toggle:focus-visible {
  background: var(--sky);
  color: var(--white);
}

.page-about .vtl__more {
  margin-top: 12px;
  border-left: 2px solid var(--jade);
  padding-left: 14px;
}

.page-about .vtl__more p {
  font-family: var(--font-serif);
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
  margin: 0;
  max-width: 34em;
}

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

.page-about .vtl-band {
  margin-top: clamp(28px, 4vw, 44px);
  border: 1px solid var(--sand);
  overflow: hidden;
}

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

/* ---------- 03 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .team-media {
  border: 1px solid var(--sand);
}

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

.page-about .team-roles {
  margin-top: clamp(24px, 3vw, 36px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--sand);
}

.page-about .team-role {
  padding: 18px 0;
  border-bottom: 1px solid var(--sand);
}

.page-about .team-role__title {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--sky);
  margin: 0 0 8px;
  font-weight: 700;
}

.page-about .team-role__text {
  font-family: var(--font-serif);
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
  margin: 0;
}

/* ---------- 04 合作 ---------- */
.page-about .partner-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--sand);
}

.page-about .partner-col {
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-bottom: 1px solid var(--sand);
}

.page-about .partner-col__kicker {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--clay);
  margin: 0 0 8px;
}

.page-about .partner-col__title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: clamp(1.04rem, 1.9vw, 1.24rem);
  color: var(--deep);
  margin: 0 0 10px;
  line-height: 1.4;
}

.page-about .partner-col__text {
  font-family: var(--font-serif);
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
  margin: 0;
  max-width: 32em;
}

/* ---------- 05 奖项 ---------- */
.page-about .award-rows {
  border-top: 1px solid var(--sand);
}

.page-about .award-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-bottom: 1px solid var(--sand);
}

.page-about .award-row__year {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--clay);
  letter-spacing: 0.02em;
  line-height: 1;
}

.page-about .award-row__title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: clamp(1rem, 1.9vw, 1.2rem);
  color: var(--deep);
  margin: 0 0 8px;
  line-height: 1.45;
}

.page-about .award-row__text {
  font-family: var(--font-serif);
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
  margin: 0;
  max-width: 34em;
}

/* ---------- 06 视觉 ---------- */
.page-about .swatch-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: clamp(24px, 3vw, 36px);
}

.page-about .swatch {
  border: 1px solid var(--sand);
  padding: 14px;
  background: var(--paper);
}

.page-about .swatch__chip {
  display: block;
  height: 40px;
  margin-bottom: 12px;
  border: 1px solid rgba(18, 22, 26, 0.12);
}

.page-about .swatch--clay .swatch__chip { background: var(--clay); }
.page-about .swatch--sky .swatch__chip { background: var(--sky); }
.page-about .swatch--jade .swatch__chip { background: var(--jade); }
.page-about .swatch--orange .swatch__chip { background: var(--orange); }

.page-about .swatch__name {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--deep);
  margin: 0 0 6px;
}

.page-about .swatch__text {
  font-family: var(--font-serif);
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--about-ink-soft);
  margin: 0;
}

/* ---------- 07 接下来 ---------- */
.page-about .next-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--sand);
}

.page-about .next-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--sand);
}

.page-about .next-item__label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--jade-deep);
  margin: 0;
  font-weight: 700;
}

.page-about .next-item__text {
  font-family: var(--font-serif);
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
  margin: 0;
  max-width: 34em;
}

.page-about .next-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

/* ---------- 侧栏注记 ---------- */
.page-about .notes-block {
  margin-bottom: 26px;
}

.page-about .notes-text {
  font-family: var(--font-serif);
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--about-ink-soft);
  margin: 8px 0 0;
}

.page-about .notes-links {
  list-style: none;
  padding: 0;
  margin: 8px 0 0;
}

.page-about .notes-links li {
  border-bottom: 1px solid var(--sand);
}

.page-about .notes-links a {
  display: block;
  padding: 9px 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  color: var(--sky);
  text-decoration: none;
}

.page-about .notes-links a:hover,
.page-about .notes-links a:focus-visible {
  color: var(--orange);
}

/* ---------- 尾部 ---------- */
.page-about .about-outro {
  position: relative;
  margin-top: clamp(40px, 6vw, 70px);
  background: var(--deep);
  color: var(--white);
  overflow: hidden;
}

.page-about .about-outro__terrain {
  height: 10px;
  background: repeating-linear-gradient(
    90deg,
    var(--clay) 0 22px,
    var(--orange) 22px 34px,
    var(--sky) 34px 58px,
    var(--jade) 58px 72px,
    var(--clay-deep) 72px 96px
  );
  opacity: 0.9;
}

.page-about .about-outro__inner {
  padding-top: clamp(36px, 5vw, 62px);
  padding-bottom: clamp(36px, 5vw, 62px);
}

.page-about .about-outro__tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  color: var(--amber);
  margin: 0 0 14px;
}

.page-about .about-outro__title {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.6rem, 4.6vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 0 0 16px;
  max-width: 20em;
}

.page-about .about-outro__text {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(247, 243, 234, 0.78);
  max-width: 32em;
  margin: 0 0 clamp(22px, 3vw, 32px);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-bottom: 1px solid var(--sand);
  }

  .page-about .about-fact {
    flex-direction: column;
    gap: 6px;
    border-bottom: 0;
    border-right: 1px solid var(--sand);
    padding: 16px 18px;
  }

  .page-about .about-fact:first-child {
    padding-left: 2px;
  }

  .page-about .about-fact:last-child {
    border-right: 0;
  }

  .page-about .team-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .team-role {
    border-bottom: 0;
    border-right: 1px solid var(--sand);
    padding: 18px 20px 18px 0;
  }

  .page-about .team-role:last-child {
    border-right: 0;
  }

  .page-about .next-item {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }

  .page-about .award-row {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 24px;
  }

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

@media (min-width: 900px) {
  .page-about .vtl__item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 24px;
    padding-left: 0;
  }

  .page-about .vtl::before {
    left: 6px;
  }

  .page-about .vtl__marker {
    position: static;
    align-items: flex-start;
    padding-left: 22px;
    position: relative;
  }

  .page-about .vtl__marker::before {
    content: "";
    position: absolute;
    left: 0;
    top: 4px;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: var(--paper);
    border: 3px solid var(--clay);
  }

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

  .page-about .vtl__dot--now {
    display: none;
  }

  .page-about .vtl__item--current .vtl__marker::before {
    background: var(--orange);
    border-color: var(--clay-deep);
    box-shadow: 0 0 0 4px rgba(242, 103, 34, 0.16);
  }

  .page-about .vtl__year {
    position: static;
    font-size: 0.86rem;
  }
}

@media (min-width: 1100px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1fr) 380px;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: 420px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .team-roles {
    margin-top: clamp(30px, 4vw, 44px);
  }

  .page-about .partner-cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 28px;
  }

  .page-about .partner-col {
    border-bottom: 0;
    border-right: 1px solid var(--sand);
    padding-right: 22px;
  }

  .page-about .partner-col:last-child {
    border-right: 0;
    padding-right: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .vtl__toggle {
    transition: none;
  }
}