.page-about {
  background: var(--ink);
  color: var(--mist);
  overflow-x: hidden;
}

.page-about .about-hero {
  position: relative;
  padding: 32px 0 72px;
}

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

.page-about .about-hero__kicker {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--fluoro);
  text-transform: uppercase;
  margin: 0 0 20px;
}

.page-about .about-hero__title {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(34px, 7.4vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
  color: var(--mist);
}

.page-about .about-hero__title-em {
  color: var(--fluoro);
}

.page-about .about-hero__lead {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(241, 245, 240, .82);
  max-width: 62ch;
  margin: 0 0 44px;
}

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

.page-about .about-hero__stat {
  background: var(--ink);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__stat:nth-child(1) { border-left: 3px solid var(--fluoro); }
.page-about .about-hero__stat:nth-child(2) { border-left: 3px solid var(--blue); }
.page-about .about-hero__stat:nth-child(3) { border-left: 3px solid var(--amber); }
.page-about .about-hero__stat:nth-child(4) { border-left: 3px solid var(--gray); }

.page-about .about-hero__num {
  font-size: clamp(28px, 5.6vw, 40px);
  font-weight: 600;
  color: var(--mist);
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .about-hero__num em {
  font-style: normal;
  font-size: 0.55em;
  color: var(--fluoro);
  margin-left: 2px;
}

.page-about .about-hero__lbl {
  font-size: 12.5px;
  color: var(--gray);
  letter-spacing: 0.06em;
}

.page-about .about-hero__slash {
  position: absolute;
  right: -12%;
  top: 40%;
  width: 60%;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(198, 240, 74, .45) 40%, transparent);
  transform: rotate(-12deg);
  transform-origin: right center;
  pointer-events: none;
  z-index: 1;
}

/* 章节骨架 */
.page-about .about-chapter {
  position: relative;
  padding: 56px 0 64px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter--paper {
  background: var(--paper);
  color: var(--paper-ink);
  border-top-color: rgba(14, 31, 26, .08);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-chapter__meta {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-chapter__num {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--fluoro);
  line-height: 1;
}

.page-about .about-chapter--paper .about-chapter__num {
  color: var(--ink);
}

.page-about .about-chapter__tag {
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--gray);
  padding-bottom: 2px;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-chapter--paper .about-chapter__tag {
  color: rgba(14, 31, 26, .55);
  border-bottom-color: rgba(14, 31, 26, .3);
}

.page-about .about-chapter__title {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(24px, 4.6vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 0 0 18px;
  max-width: 22ch;
}

.page-about .about-chapter--paper .about-chapter__title {
  color: var(--paper-ink);
}

.page-about .about-chapter__lead {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(241, 245, 240, .78);
  max-width: 62ch;
  margin: 0 0 32px;
}

.page-about .about-chapter--paper .about-chapter__lead {
  color: rgba(14, 31, 26, .78);
}

.page-about .about-chapter__note {
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(127, 150, 140, 1);
  max-width: 62ch;
  margin: 28px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--line-strong);
}

.page-about .about-chapter--paper .about-chapter__note {
  color: rgba(14, 31, 26, .68);
  border-left-color: rgba(14, 31, 26, .28);
}

.page-about .about-chapter__note a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

.page-about .about-chapter--paper .about-chapter__note a {
  color: var(--ink);
}

.page-about .about-chapter__note a:hover {
  color: var(--fluoro);
}

.page-about .about-chapter--paper .about-chapter__note a:hover {
  color: var(--blue);
}

/* 图片 */
.page-about .about-figure {
  margin: 0 0 32px;
  position: relative;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
  filter: saturate(.85) contrast(1.03);
}

.page-about .about-chapter--paper .about-figure img {
  border-color: rgba(14, 31, 26, .14);
}

.page-about .about-figure--wide img {
  aspect-ratio: 2 / 1;
}

.page-about .about-figure__cap {
  display: inline-block;
  margin-top: 12px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--gray);
  text-transform: uppercase;
}

.page-about .about-chapter--paper .about-figure__cap {
  color: rgba(14, 31, 26, .55);
}

/* 01 时间轴 */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 14px;
  bottom: 22px;
  width: 2px;
  background: linear-gradient(180deg, var(--fluoro) 0%, var(--blue) 55%, var(--line-soft) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 30px 38px;
  transition: transform .3s var(--ease);
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 18px;
  height: 18px;
  background: var(--ink);
  border: 2px solid var(--fluoro);
  transform: rotate(45deg);
  transition: background .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__dot {
  background: var(--fluoro);
  box-shadow: 0 0 0 5px rgba(198, 240, 74, .16);
}

.page-about .about-timeline__stage {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--fluoro);
  margin: 0 0 6px;
}

.page-about .about-timeline__name {
  font-family: var(--font-title);
  font-size: 19px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--mist);
  letter-spacing: -0.005em;
}

.page-about .about-timeline__desc {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(241, 245, 240, .74);
  margin: 0;
  max-width: 58ch;
}

/* 02 数据来源 */
.page-about .about-source {
  margin: 0 0 32px;
  padding: 22px 20px 24px;
  background: rgba(14, 31, 26, .05);
  border: 1px solid rgba(14, 31, 26, .14);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-source__flow {
  display: flex;
  align-items: center;
  gap: 0;
  margin-bottom: 18px;
}

.page-about .about-source__node {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--paper);
  background: var(--ink);
  border-radius: 50%;
}

.page-about .about-source__node:nth-of-type(2) {
  background: var(--blue);
  color: var(--mist);
}

.page-about .about-source__line {
  flex: 1 1 auto;
  height: 2px;
  background: rgba(14, 31, 26, .2);
  transition: background .3s var(--ease);
}

.page-about .about-source__line--accent {
  background: linear-gradient(90deg, var(--blue), var(--fluoro));
}

.page-about .about-source__labels {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-source__label {
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(14, 31, 26, .7);
  margin: 0;
}

.page-about .about-source__label strong {
  display: block;
  font-weight: 700;
  color: var(--paper-ink);
  margin-bottom: 3px;
  font-size: 13px;
  letter-spacing: 0.02em;
}

.page-about .about-source__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(14, 31, 26, .12);
  border: 1px solid rgba(14, 31, 26, .16);
  margin: 0 0 32px;
}

.page-about .about-source__fact {
  background: var(--paper);
  padding: 16px 16px 18px;
  margin: 0;
}

.page-about .about-source__fact dt {
  font-size: 22px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.02em;
  margin: 0 0 6px;
  line-height: 1.1;
}

.page-about .about-source__fact dd {
  font-size: 13px;
  line-height: 1.65;
  color: rgba(14, 31, 26, .7);
  margin: 0;
}

/* 03 团队 */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-bottom: 32px;
}

.page-about .about-team__panel {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .about-team__panel:hover {
  border-color: rgba(198, 240, 74, .5);
  background: rgba(18, 58, 48, .9);
}

.page-about .about-team__panel::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: transparent;
  transition: background .3s var(--ease);
}

.page-about .about-team__panel:hover::after {
  background: var(--fluoro);
}

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

.page-about .about-team__name {
  font-family: var(--font-title);
  font-size: 19px;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--mist);
  letter-spacing: -0.005em;
}

.page-about .about-team__desc {
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(241, 245, 240, .72);
  margin: 0;
}

/* 04 联系入口 */
.page-about .about-contact-entry {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(14, 31, 26, .12);
  border: 1px solid rgba(14, 31, 26, .16);
  margin: 0 0 24px;
}

.page-about .about-contact-entry__row {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  background: var(--paper);
  flex-wrap: wrap;
}

.page-about .about-contact-entry__tag {
  flex: 0 0 auto;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: rgba(14, 31, 26, .5);
  text-transform: uppercase;
  min-width: 62px;
}

.page-about .about-contact-entry__val {
  margin: 0;
  font-size: 15.5px;
  color: var(--ink);
  letter-spacing: 0.01em;
  word-break: break-all;
}

/* 05 覆盖与人群 */
.page-about .about-audience {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-bottom: 8px;
}

.page-about .about-audience__col {
  padding: 20px 18px 22px;
  background: rgba(18, 58, 48, .55);
  border-left: 3px solid var(--blue);
}

.page-about .about-audience__col:nth-child(2) {
  border-left-color: var(--fluoro);
}

.page-about .about-audience__col:nth-child(3) {
  border-left-color: var(--amber);
}

.page-about .about-audience__name {
  font-family: var(--font-title);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--mist);
}

.page-about .about-audience__col p {
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(241, 245, 240, .76);
  margin: 0;
}

/* 06 下一步 */
.page-about .about-next {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  border-top: 1px solid rgba(14, 31, 26, .16);
}

.page-about .about-next__item {
  border-bottom: 1px solid rgba(14, 31, 26, .16);
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  grid-template-rows: auto auto;
  grid-template-areas:
    "idx name"
    "idx desc";
  gap: 4px 12px;
  padding: 18px 8px 18px 4px;
  text-decoration: none;
  color: inherit;
  transition: background .28s var(--ease), padding-left .28s var(--ease);
}

.page-about .about-next__link:hover {
  background: rgba(14, 31, 26, .05);
  padding-left: 14px;
}

.page-about .about-next__idx {
  grid-area: idx;
  align-self: center;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink);
  opacity: .55;
  transition: color .28s var(--ease), opacity .28s var(--ease);
}

.page-about .about-next__link:hover .about-next__idx {
  color: var(--blue);
  opacity: 1;
}

.page-about .about-next__name {
  grid-area: name;
  font-family: var(--font-title);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper-ink);
  letter-spacing: -0.005em;
  align-self: end;
}

.page-about .about-next__desc {
  grid-area: desc;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(14, 31, 26, .68);
  align-self: start;
}

/* 中等屏幕 */
@media (min-width: 640px) {
  .page-about .about-chapter {
    padding: 68px 0 76px;
  }

  .page-about .about-hero {
    padding: 44px 0 88px;
  }

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

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

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

  .page-about .about-contact-entry__row {
    padding: 18px 22px;
  }
}

/* 桌面 */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 64px 0 112px;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
    max-width: 58ch;
  }

  .page-about .about-chapter {
    padding: 88px 0 96px;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-chapter__meta {
    position: sticky;
    top: 108px;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .page-about .about-chapter__num {
    font-size: 44px;
  }

  .page-about .about-chapter__tag {
    font-size: 11.5px;
    border-bottom: none;
    border-left: 1px solid var(--line-strong);
    padding: 0 0 0 10px;
    line-height: 1.4;
  }

  .page-about .about-chapter--paper .about-chapter__tag {
    border-left-color: rgba(14, 31, 26, .3);
    border-bottom: none;
  }

  /* 桌面端正文错位，让长卷不致平板 */
  .page-about .about-chapter__main {
    max-width: 720px;
  }

  .page-about .about-chapter:nth-of-type(even) .about-chapter__main {
    margin-left: 36px;
  }

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

  .page-about .about-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 130px minmax(0, 1fr);
    grid-template-rows: auto auto;
    grid-template-areas:
      "stage name"
      "stage desc";
    gap: 4px 24px;
    padding-left: 42px;
    padding-bottom: 34px;
  }

  .page-about .about-timeline__stage {
    grid-area: stage;
    margin: 2px 0 0;
  }

  .page-about .about-timeline__name {
    grid-area: name;
    margin: 0;
  }

  .page-about .about-timeline__desc {
    grid-area: desc;
  }

  .page-about .about-figure--wide img {
    aspect-ratio: 21 / 9;
  }
}
<<<END>>>

等等，我需要输出结尾标记吗？要求里说标记必须是三个尖括号，按顺序输出，每个只能出现一次。我只看到 MAIN_HTML 和 PAGE_CSS 的标记。让我就输出这两个。

其实我加了 <<<END>>>，但那个没有指定。让我去掉。

另外我再检查一下——要求说“严格按照以下标记顺序输出”，只指定了两个标记。所以只输出那两个。

让我去掉 <<<END>>>。