.page-about {
  --about-paper: #F3EADA;
  --about-paper-deep: #E9DDC6;
  --about-ink: #221A16;
  --about-ink-soft: #4C4239;
  --about-ink-faint: #7A6A5C;
  --about-rule: rgba(34, 26, 22, 0.16);
  --about-amber-deep: #A85A12;
  overflow-x: clip;
}

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

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 52px;
  background:
    radial-gradient(circle at 88% 8%, rgba(53, 224, 214, 0.18), transparent 56%),
    radial-gradient(circle at 4% 96%, rgba(255, 106, 43, 0.16), transparent 52%),
    linear-gradient(158deg, #0B2B26 0%, #101F3C 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .hero-watermark {
  position: absolute;
  right: -12px;
  bottom: -26px;
  z-index: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(96px, 26vw, 230px);
  line-height: 1;
  letter-spacing: -0.05em;
  color: rgba(255, 106, 43, 0.09);
  pointer-events: none;
  user-select: none;
}

@supports (-webkit-text-stroke: 1px red) {
  .page-about .hero-watermark {
    color: transparent;
    -webkit-text-stroke: 1px rgba(255, 106, 43, 0.28);
  }
}

.page-about .hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 28px;
  margin-top: 22px;
}

.page-about .hero-lead h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 7.4vw, 60px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .hero-lede {
  margin: 18px 0 0;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--text-body);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .hero-board {
  border: 1px solid rgba(53, 224, 214, 0.26);
  border-radius: var(--radius-lg);
  padding: 18px 18px 6px;
  background: linear-gradient(165deg, rgba(11, 43, 38, 0.86), rgba(16, 31, 60, 0.86));
  box-shadow: var(--shadow-deep);
}

.page-about .hero-board__label {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .hero-board__list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
}

.page-about .hero-board__list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 0;
  border-top: 1px dashed var(--line-soft);
}

.page-about .hero-board__list li:first-child {
  border-top: 0;
}

.page-about .hero-board__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 25px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--neon);
  line-height: 1.1;
}

.page-about .hero-board__unit {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ============ 主体骨架 ============ */
.page-about .about-body {
  padding: 36px 0 72px;
}

.page-about .about-grid {
  display: flex;
  flex-direction: column;
  gap: 26px;
}

.page-about .about-grid > * {
  min-width: 0;
}

.page-about .about-side {
  order: -1;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-main {
  padding: 26px 18px 34px;
  border-radius: var(--radius-lg);
  background-color: var(--about-paper);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.45), rgba(255, 255, 255, 0)),
    repeating-linear-gradient(180deg, rgba(34, 26, 22, 0.026) 0 1px, transparent 1px 7px);
  color: var(--about-ink);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.36);
}

/* ============ 章节 ============ */
.page-about .about-sec {
  padding-bottom: 40px;
}

.page-about .about-sec + .about-sec {
  padding-top: 40px;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  margin-bottom: 18px;
}

.page-about .about-sec__no {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 8vw, 50px);
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: rgba(255, 106, 43, 0.9);
}

@supports (-webkit-text-stroke: 1px red) {
  .page-about .about-sec__no {
    color: transparent;
    -webkit-text-stroke: 1.5px var(--neon);
  }
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(21px, 4.8vw, 31px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--about-ink);
}

.page-about .about-sec__intro {
  margin: 0 0 22px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.82;
  color: var(--about-ink-soft);
}

.page-about .about-sec__body {
  display: grid;
  gap: 20px;
}

.page-about .about-main .prose p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.86;
  color: var(--about-ink-soft);
}

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

/* 图片容器（奶油纸上的深色对照） */
.page-about .about-main .figure-frame {
  margin: 0;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--about-paper-deep);
}

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

.page-about .about-main .figure-frame__caption {
  margin: 0;
  padding: 10px 14px 12px;
  border-top: 1px solid var(--about-rule);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--about-ink-faint);
}

.page-about .about-sec__figure--full {
  margin-top: 22px;
}

/* 引用块 */
.page-about .about-quote {
  margin: 24px 0 0;
  padding: 15px 16px 15px 18px;
  border-left: 3px solid var(--neon);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--about-paper-deep);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(17px, 3.8vw, 21px);
  line-height: 1.62;
  color: var(--about-ink);
}

.page-about .about-quote__src {
  display: block;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--about-rule);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--about-ink-faint);
}

/* ============ 版本时间线 ============ */
.page-about .timeline {
  margin: 0 0 4px;
}

.page-about .timeline__jumps {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.page-about .timeline__jump {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-pill);
  background: var(--about-paper-deep);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--about-ink);
  text-decoration: none;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.page-about .timeline__jump:hover,
.page-about .timeline__jump:focus-visible {
  background: var(--neon);
  border-color: var(--neon);
  color: #1A0F08;
}

.page-about .timeline__ruler {
  display: block;
  width: 100%;
  max-width: 720px;
  height: auto;
  margin: 0 0 16px;
  color: rgba(78, 107, 92, 0.6);
}

.page-about .timeline__ruler line {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-dasharray: 5 7;
}

.page-about .timeline__ruler circle {
  fill: var(--neon);
  stroke: none;
}

.page-about .timeline__track {
  list-style: none;
  margin: 0;
  padding: 0 0 14px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 78%;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .ver-card {
  scroll-snap-align: start;
  scroll-margin-top: 96px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px 14px;
  border: 1px solid rgba(53, 224, 214, 0.24);
  border-radius: var(--radius-md);
  background: linear-gradient(165deg, #0B2B26, #101F3C 88%);
  color: var(--text-body);
}

.page-about .ver-card__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 33px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--neon);
}

.page-about .ver-card__title {
  margin: 2px 0 0;
  font-family: var(--font-head);
  font-size: 16.5px;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .ver-card__body {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .ver-card__more {
  margin-top: auto;
}

.page-about .ver-card__more summary {
  list-style: none;
  cursor: pointer;
  padding: 9px 0 4px;
  border-top: 1px dashed rgba(53, 224, 214, 0.26);
  font-size: 12.8px;
  color: var(--cyan);
}

.page-about .ver-card__more summary::-webkit-details-marker {
  display: none;
}

.page-about .ver-card__more summary::before {
  content: "+ ";
  font-family: var(--font-mono);
  font-weight: 700;
}

.page-about .ver-card__more[open] summary::before {
  content: "– ";
}

.page-about .ver-card__more p {
  margin: 8px 0 0;
  font-size: 13.2px;
  line-height: 1.75;
  color: var(--text-body);
}

.page-about .timeline__hint {
  margin: 8px 0 0;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--about-ink-faint);
}

.page-about .about-band {
  margin: 26px 0 0;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--about-paper-deep);
}

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

.page-about .about-band__caption {
  margin: 0;
  padding: 10px 14px 12px;
  border-top: 1px solid var(--about-rule);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--about-ink-faint);
}

/* ============ 流程 ============ */
.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .flow__step {
  position: relative;
  padding: 16px 0 18px 22px;
  border-left: 2px solid var(--about-rule);
}

.page-about .flow__step:last-child {
  padding-bottom: 6px;
}

.page-about .flow__step::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--about-paper);
  border: 2px solid var(--amber);
}

.page-about .flow__step:last-child::before {
  background: var(--neon);
  border-color: var(--neon);
  box-shadow: 0 0 0 4px rgba(255, 106, 43, 0.18);
}

.page-about .flow__time {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--about-amber-deep);
}

.page-about .flow__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 16.5px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--about-ink);
}

.page-about .flow__body {
  margin: 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--about-ink-soft);
}

/* ============ 团队 ============ */
.page-about .team-roles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .team-role {
  padding: 16px 16px 18px;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-md);
  background: var(--about-paper-deep);
}

.page-about .team-role__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 15.5px;
  font-weight: 800;
  color: var(--about-ink);
}

.page-about .team-role__title::before {
  content: "";
  display: block;
  width: 26px;
  height: 3px;
  margin-bottom: 10px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--neon), var(--amber));
}

.page-about .team-role__body {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* ============ 接下来 ============ */
.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .next-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  padding: 16px 16px 18px;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-md);
  background: linear-gradient(150deg, rgba(255, 106, 43, 0.11), rgba(53, 224, 214, 0.09));
}

.page-about .next-item__no {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--neon);
}

.page-about .next-item__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--about-ink);
}

.page-about .next-item__body {
  margin: 0;
  font-size: 14.2px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* ============ 结尾行动区 ============ */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin-top: 34px;
  padding: 28px 20px 30px;
  border: 1px solid rgba(53, 224, 214, 0.22);
  border-radius: var(--radius-lg);
  background: linear-gradient(140deg, #0B2B26, #101F3C 72%);
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: -70px;
  top: -70px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 106, 43, 0.3), transparent 70%);
  pointer-events: none;
}

.page-about .about-cta__title {
  position: relative;
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: clamp(20px, 4.6vw, 28px);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .about-cta__body {
  position: relative;
  margin: 0 0 22px;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.84;
  color: var(--text-body);
}

.page-about .about-cta__links {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 侧栏 ============ */
.page-about .about-toc {
  padding: 16px 16px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(165deg, #0B2B26, #101F3C 90%);
}

.page-about .toc__title {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .toc__list li {
  flex: none;
}

.page-about .toc__link {
  display: inline-block;
  padding: 7px 13px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-pill);
  font-size: 13px;
  white-space: nowrap;
  color: var(--text-body);
  text-decoration: none;
  transition: border-color 0.18s ease, color 0.18s ease, background 0.18s ease;
}

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

.page-about .toc__link.is-active {
  border-color: var(--neon);
  background: var(--neon);
  color: #1A0F08;
  font-weight: 700;
}

.page-about .about-side__card {
  padding: 16px 16px 18px;
  border: 1px dashed rgba(255, 178, 92, 0.34);
  border-radius: var(--radius-md);
  background: rgba(16, 31, 60, 0.62);
}

.page-about .about-side__card-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 800;
  color: var(--amber);
}

.page-about .about-side__card-body {
  margin: 0 0 14px;
  font-size: 13.2px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-side__btn {
  display: block;
  width: 100%;
  text-align: center;
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .timeline__track {
    grid-auto-columns: 47%;
  }

  .page-about .about-main {
    padding: 32px 26px 40px;
  }
}

@media (min-width: 760px) {
  .page-about .about-sec__body {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 26px;
    align-items: start;
  }

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

  .page-about .flow {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
  }

  .page-about .flow__step:nth-child(2)::before {
    border-color: var(--amber);
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.9fr);
    gap: 44px;
    align-items: end;
  }

  .page-about .about-hero {
    padding: 34px 0 60px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    padding: 48px 0 88px;
  }

  .page-about .about-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 268px;
    gap: 38px;
    align-items: start;
  }

  .page-about .about-side {
    order: 0;
    position: sticky;
    top: 96px;
  }

  .page-about .toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .toc__list li {
    flex: none;
  }

  .page-about .toc__link {
    display: block;
    padding: 9px 12px;
    border-color: transparent;
    border-radius: var(--radius-sm);
    white-space: normal;
    font-size: 13.2px;
  }

  .page-about .about-main {
    padding: 44px 42px 50px;
  }

  .page-about .timeline__track {
    grid-auto-columns: 32%;
  }
}

@media (min-width: 1200px) {
  .page-about .about-main {
    padding: 52px 58px 58px;
  }

  .page-about .about-sec {
    padding-bottom: 48px;
  }

  .page-about .about-sec + .about-sec {
    padding-top: 48px;
  }
}

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

  .page-about .timeline__track {
    scroll-behavior: auto;
  }
}