.page-about {
  background: var(--ink);
  color: var(--cloud);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .section--tint {
  color: var(--ink);
}

.page-about .section-head__title,
.page-about .about-hero__title,
.page-about .about-step__title,
.page-about .about-line__name,
.page-about .about-tl__title,
.page-about .about-cadence__title {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(36px, 6vw, 64px) clamp(44px, 8vw, 88px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -40% 34% 30% -22%;
  background: var(--grad-refresh);
  opacity: 0.6;
  filter: blur(70px);
  border-radius: 50%;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 55%;
  background: repeating-linear-gradient(90deg, rgba(227, 234, 232, 0.07) 0 1px, transparent 1px 96px);
  z-index: 0;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  margin: 12px 0 18px;
  max-width: 19ch;
  font-size: clamp(31px, 7.4vw, 64px);
  line-height: 1.04;
  transform: skewX(-2deg);
  transform-origin: left bottom;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  max-width: 58ch;
  color: rgba(245, 248, 246, 0.82);
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
}

.page-about .about-fact {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 6px;
  padding-top: 12px;
  border-top: 2px solid var(--pitch);
}

.page-about .about-fact:nth-child(2) { border-top-color: var(--signal); }
.page-about .about-fact:nth-child(3) { border-top-color: var(--yellow); }
.page-about .about-fact:nth-child(4) { border-top-color: var(--gray); }

.page-about .about-fact__num {
  font-family: var(--font-data);
  font-size: clamp(28px, 5.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--cloud);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact__unit {
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--yellow);
  letter-spacing: 0.08em;
}

.page-about .about-fact__label {
  flex: 1 0 100%;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
  letter-spacing: 0.02em;
}

/* ---------- 起点 ---------- */

.page-about .about-origin {
  padding-block: clamp(52px, 8vw, 96px);
}

.page-about .about-split {
  display: grid;
  gap: 30px;
}

.page-about .about-split__text .prose {
  margin: 16px 0 0;
  max-width: 60ch;
}

.page-about .about-split__cta {
  margin-top: 26px;
}

.page-about .about-split__media {
  margin: 0;
  border-radius: var(--r-l);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-layer);
}

.page-about .about-split__media .media-frame__img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  padding-block: clamp(52px, 8vw, 96px);
}

.page-about .about-team__head {
  max-width: 62ch;
}

.page-about .about-team__body {
  display: grid;
  gap: 40px;
  margin-top: clamp(30px, 5vw, 48px);
}

.page-about .about-ring {
  position: relative;
  width: min(264px, 76vw);
  margin: 0 auto;
  aspect-ratio: 1 / 1;
}

.page-about .about-ring svg {
  display: block;
  width: 100%;
  height: 100%;
}

.page-about .about-ring__center {
  position: absolute;
  inset: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.page-about .about-ring__center strong {
  font-family: var(--font-data);
  font-size: clamp(30px, 7vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--cloud);
  font-variant-numeric: tabular-nums;
}

.page-about .about-ring__center span {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gray);
}

.page-about .about-lines {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-line {
  position: relative;
  padding: 18px 20px 18px 38px;
  background: var(--ink-layer);
  border: 1px solid rgba(227, 234, 232, 0.09);
  border-radius: var(--r-m);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-line:hover,
.page-about .about-line:focus-within {
  border-color: var(--pitch);
  transform: translateX(4px);
}

.page-about .about-line__dot {
  position: absolute;
  left: 18px;
  top: 24px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--pitch);
}

.page-about .about-line__dot--orange { background: var(--signal); }
.page-about .about-line__dot--yellow { background: var(--yellow); }
.page-about .about-line__dot--gray { background: var(--gray); }

.page-about .about-line__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 14px;
}

.page-about .about-line__name {
  margin: 0;
  font-size: 19px;
  color: var(--cloud);
}

.page-about .about-line__num {
  font-family: var(--font-data);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--yellow);
  font-variant-numeric: tabular-nums;
}

.page-about .about-line__desc {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 248, 246, 0.76);
}

/* ---------- 数据 ---------- */

.page-about .about-data {
  padding-block: clamp(52px, 8vw, 96px);
}

.page-about .about-data__banner {
  margin: clamp(28px, 4vw, 40px) 0 0;
  border-radius: var(--r-l);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink);
}

.page-about .about-data__banner .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 5;
  object-fit: cover;
}

.page-about .about-steps {
  list-style: none;
  counter-reset: aboutstep;
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-step {
  position: relative;
  counter-increment: aboutstep;
  padding: 22px 22px 22px 66px;
  background: #ffffff;
  border-radius: var(--r-m);
  border: 1px solid var(--line);
  border-left: 4px solid var(--pitch);
}

.page-about .about-step::before {
  content: counter(aboutstep, decimal-leading-zero);
  position: absolute;
  left: 20px;
  top: 22px;
  font-family: var(--font-data);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  color: var(--pitch-deep);
}

.page-about .about-step__title {
  margin: 0;
  font-size: 18px;
  color: var(--ink);
}

.page-about .about-step p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: #2c3f50;
}

/* ---------- 版本时间线 ---------- */

.page-about .about-versions {
  padding-block: clamp(52px, 8vw, 96px);
}

.page-about .about-versions__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-versions__lead {
  max-width: 52ch;
  color: rgba(245, 248, 246, 0.8);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--pitch) 0%, var(--signal) 62%, var(--yellow) 100%);
}

.page-about .about-tl {
  position: relative;
  padding: 0 0 28px 36px;
}

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

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 3px solid var(--pitch);
}

.page-about .about-tl__ver {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 10px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--yellow);
  border: 1px solid rgba(255, 212, 71, 0.42);
  border-radius: 999px;
}

.page-about .about-tl__title {
  margin: 0;
  font-size: 21px;
  color: var(--cloud);
}

.page-about .about-tl__text {
  margin: 8px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 248, 246, 0.74);
}

.page-about .about-versions__link {
  margin-top: 28px;
  color: var(--cloud);
}

.page-about .about-versions__media {
  margin: 0;
  border-radius: var(--r-l);
  overflow: hidden;
  border: 1px solid rgba(227, 234, 232, 0.14);
  background: var(--ink-layer);
}

.page-about .about-versions__media .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

/* ---------- 节奏 ---------- */

.page-about .about-cadence {
  padding-block: clamp(52px, 8vw, 96px);
}

.page-about .about-cadence__grid {
  display: grid;
  gap: 20px;
  margin-top: clamp(28px, 4vw, 40px);
}

.page-about .about-cadence__card {
  padding: 26px 24px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-top: 4px solid var(--pitch);
  border-radius: var(--r-m);
}

.page-about .about-cadence__card--signal {
  border-top-color: var(--signal);
}

.page-about .about-cadence__title {
  margin: 0;
  font-size: 22px;
  color: var(--ink);
}

.page-about .about-cadence__sub {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: #3a4d5e;
}

.page-about .about-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 9px;
  height: 2px;
  background: var(--signal);
}

/* ---------- 联系 ---------- */

.page-about .about-cta {
  position: relative;
  overflow: hidden;
  padding-block: clamp(52px, 8vw, 100px);
  background-image: var(--grad-refresh);
  background-color: var(--ink);
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: -10%;
  top: -20%;
  width: 62%;
  height: 150%;
  background: repeating-linear-gradient(115deg, rgba(245, 248, 246, 0.06) 0 1px, transparent 1px 60px);
  pointer-events: none;
}

.page-about .about-cta__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-cta__lead {
  max-width: 54ch;
  color: rgba(245, 248, 246, 0.9);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-cta__foot {
  margin: 26px 0 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 248, 246, 0.72);
}

/* ---------- 中等屏幕 ---------- */

@media (min-width: 700px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-cadence__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 960px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-split__media {
    margin-top: 20px;
  }

  .page-about .about-team__body {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .about-ring {
    margin: 0;
  }

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

  .page-about .about-versions__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 330px);
    gap: 72px;
    align-items: start;
  }

  .page-about .about-versions__media {
    margin-top: 46px;
  }
}

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

  .page-about .about-line:hover,
  .page-about .about-line:focus-within {
    transform: none;
  }
}