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

.page-about .container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(18px, 2.6vw, 32px);
  padding-bottom: clamp(40px, 6vw, 88px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 100% at 0% 0%, rgba(11, 59, 58, 0.9) 0%, rgba(5, 7, 10, 0) 62%),
    var(--ink);
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(26px, 4vw, 52px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-hero__title {
  margin: clamp(10px, 1.4vw, 18px) 0 0;
  font-size: clamp(32px, 5.4vw, 66px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.02em;
  max-width: 15em;
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.2vw, 26px) 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.35vw, 17px);
  line-height: 1.78;
  color: var(--paper);
  opacity: 0.86;
}

.page-about .about-hero__lede--tight {
  margin-top: 12px;
  font-size: clamp(14px, 1.15vw, 15px);
  color: var(--muted);
  opacity: 1;
}

.page-about .about-hero__panel {
  border-top: 2px solid var(--lime);
  align-self: start;
}

.page-about .about-hero__panel .panel__head {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-hero__panel .metric-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-block: 10px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__panel .metric-row:last-child {
  border-bottom: 0;
}

.page-about .about-hero__panel .metric-row__label {
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-hero__panel .metric-row__value {
  font-family: var(--mono);
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--lime);
  white-space: nowrap;
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding-block: clamp(38px, 6vw, 78px);
}

.page-about .about-block__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 24px;
  padding-bottom: 14px;
  margin-bottom: clamp(22px, 3vw, 38px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-h2 {
  flex: 1 1 320px;
  margin: 0;
  min-width: 0;
  font-size: clamp(23px, 3.1vw, 38px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.01em;
}

.page-about .section-index {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .body-copy {
  max-width: 38em;
  margin: 0 0 16px;
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.78;
  color: var(--paper);
  opacity: 0.88;
}

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

/* ---------- 起点 ---------- */
.page-about .about-origin {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
}

.page-about .about-origin__body {
  position: relative;
  padding-left: clamp(18px, 2.6vw, 34px);
  border-left: 1px solid var(--line);
}

.page-about .about-origin__body::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--paper);
  box-sizing: border-box;
}

.page-about .about-quote {
  align-self: start;
  padding: clamp(18px, 2.6vw, 30px) clamp(18px, 2.6vw, 30px) clamp(18px, 2.6vw, 30px) clamp(20px, 3vw, 34px);
  background: var(--wine);
  border-left: 4px solid var(--lime);
}

.page-about .about-quote__text {
  margin: 0;
  font-size: clamp(17px, 1.7vw, 21px);
  line-height: 1.62;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-quote__meta {
  margin: 16px 0 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

/* ---------- 斜切分隔带 ---------- */
.page-about .about-diagonal {
  margin-block: clamp(30px, 5vw, 60px);
  padding-block: clamp(24px, 3.6vw, 40px);
  background: var(--wine);
  clip-path: polygon(0 8px, 100% 0, 100% calc(100% - 8px), 0 100%);
}

.page-about .about-diagonal--indigo {
  background: var(--indigo);
}

.page-about .about-diagonal__line {
  margin: 0;
  max-width: 34em;
  font-size: clamp(16px, 2vw, 24px);
  font-weight: 700;
  line-height: 1.42;
  letter-spacing: -0.01em;
  color: var(--paper);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(22px, 3vw, 36px);
  min-width: 0;
}

.page-about .about-figure .image-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure .image-frame__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

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

.page-about .about-figure--bleed .image-frame__media {
  max-height: 340px;
  overflow: hidden;
}

/* ---------- 版本演进 ---------- */
.page-about .versions {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.2vw, 26px);
}

.page-about .versions__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 12px;
  min-width: 0;
}

.page-about .versions__bar {
  position: relative;
  display: block;
  height: 4px;
  background: var(--line);
  overflow: hidden;
}

.page-about .versions__bar::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--fill, 25%);
  background: var(--cyan);
}

.page-about .versions__item--v4 .versions__bar::after {
  background: var(--lime);
}

.page-about .versions__item--v1 {
  --fill: 26%;
}

.page-about .versions__item--v2 {
  --fill: 52%;
}

.page-about .versions__item--v3 {
  --fill: 78%;
}

.page-about .versions__item--v4 {
  --fill: 100%;
}

.page-about .versions__tag {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .versions__name {
  font-size: clamp(17px, 1.5vw, 20px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .versions__item--v4 .versions__name {
  color: var(--lime);
}

.page-about .versions__note {
  font-size: clamp(13px, 1.1vw, 14px);
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 评测方法 ---------- */
.page-about .about-block--teal {
  background: var(--deep-teal);
  margin-block: clamp(24px, 4vw, 48px);
}

.page-about .about-method {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
  margin-bottom: clamp(26px, 4vw, 46px);
}

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

.page-about .about-method__text .link-arrow {
  color: var(--lime);
}

.page-about .about-figure--side {
  margin-bottom: 0;
}

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

.page-about .flow__step {
  background: var(--panel);
  padding: 18px 16px 20px;
  min-width: 0;
  transition: background 0.2s ease;
  outline-offset: -3px;
}

.page-about .flow__step:hover,
.page-about .flow__step:focus-within,
.page-about .flow__step:focus {
  background: rgba(0, 229, 255, 0.1);
}

.page-about .flow__num {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .flow__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .flow__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.68;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-lead-copy {
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .team-bars {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(12px, 2vw, var(--grid-gap));
  align-items: end;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .team-bar {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 8px;
  min-width: 0;
}

.page-about .team-bar__value {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.page-about .team-bar__fill {
  display: block;
  width: 100%;
  background: linear-gradient(180deg, rgba(0, 229, 255, 0.75) 0%, rgba(0, 229, 255, 0.14) 100%);
  border-bottom: 3px solid var(--lime);
}

.page-about .team-bar__label {
  font-size: 13px;
  color: var(--muted);
}

.page-about .team-bar--8 .team-bar__fill {
  height: 120px;
}

.page-about .team-bar--6 .team-bar__fill {
  height: 90px;
}

.page-about .team-bar--4a .team-bar__fill,
.page-about .team-bar--4b .team-bar__fill {
  height: 60px;
}

.page-about .team-notes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
}

.page-about .team-note {
  background: var(--ink);
  padding: 18px 0 20px;
  min-width: 0;
}

.page-about .team-note__title {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--lime);
}

.page-about .team-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper);
  opacity: 0.82;
}

/* ---------- 数据来源 ---------- */
.page-about .about-block--wine {
  background: var(--wine);
}

.page-about .sources {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 44px);
}

.page-about .sources__col {
  min-width: 0;
  padding-top: 16px;
  border-top: 1px solid rgba(232, 237, 242, 0.22);
}

.page-about .sources__num {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--lime);
}

.page-about .sources__title {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .sources .body-copy {
  opacity: 0.86;
}

/* ---------- 社区 ---------- */
.page-about .about-block--community {
  background:
    linear-gradient(180deg, rgba(43, 27, 82, 0.72) 0%, rgba(43, 27, 82, 0.28) 100%),
    var(--ink);
}

.page-about .community-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 44px);
  align-items: start;
}

.page-about .community-split__text {
  min-width: 0;
}

.page-about .community-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 30px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .community-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .community-stat__num {
  font-size: clamp(20px, 2.6vw, 30px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--lime);
}

.page-about .community-stat__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-figure--community {
  margin-bottom: 0;
}

/* ---------- 年度清单 ---------- */
.page-about .checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
}

.page-about .checklist__item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--ink);
  padding: 20px 0 22px;
  min-width: 0;
}

.page-about .checklist__mark {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  margin-top: 8px;
  background: var(--lime);
}

.page-about .checklist__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.32;
  color: var(--paper);
}

.page-about .checklist__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 40em;
}

/* ---------- 合作邀请 ---------- */
.page-about .about-block--cta {
  border-top: 1px solid var(--line);
}

.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
  border-left: 4px solid var(--cyan);
  padding-left: clamp(16px, 2.6vw, 30px);
}

.page-about .about-cta__title {
  margin: 0 0 14px;
  font-size: clamp(22px, 2.8vw, 34px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
}

.page-about .about-cta__actions .link-arrow {
  color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

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

  .page-about .team-bar--8 .team-bar__fill {
    height: 200px;
  }

  .page-about .team-bar--6 .team-bar__fill {
    height: 150px;
  }

  .page-about .team-bar--4a .team-bar__fill,
  .page-about .team-bar--4b .team-bar__fill {
    height: 100px;
  }

  .page-about .team-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px var(--grid-gap);
    background: transparent;
    border-top: 0;
  }

  .page-about .team-note {
    border-top: 1px solid var(--line);
  }

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

  .page-about .community-split {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-method {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .page-about .flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

  .page-about .checklist {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px var(--grid-gap);
    background: transparent;
  }

  .page-about .checklist__item {
    border-top: 1px solid var(--line);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: center;
  }
}

@media (max-width: 480px) {
  .page-about .community-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-hero__panel .metric-row__value {
    font-size: 15px;
  }
}

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