.page-about {
  --about-ink: #16203F;
  --about-soft: #F7F3EC;
  --about-radius-organic: 26px 8px 26px 8px;
  display: block;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 1.75rem 0 2.5rem;
  background:
    radial-gradient(120% 90% at 6% 0%, rgba(196, 71, 43, 0.14), transparent 58%),
    radial-gradient(90% 80% at 96% 30%, rgba(15, 138, 106, 0.12), transparent 62%),
    linear-gradient(180deg, var(--mist) 0%, #FBF8F2 62%, var(--mist) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 5px;
  background: repeating-linear-gradient(
    90deg,
    var(--clay) 0 44px,
    var(--amber) 44px 66px,
    var(--jade) 66px 100px,
    transparent 100px 138px
  );
  opacity: 0.9;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.75rem;
  margin-top: 1.5rem;
  align-items: start;
}

.page-about .about-hero__lead h1 {
  margin: 0.5rem 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -0.015em;
  line-height: 1.14;
  font-size: clamp(2.05rem, 6.4vw, 3.6rem);
  color: var(--night);
}

.page-about .about-hero__lead .lede {
  margin: 1.1rem 0 0;
  max-width: 46ch;
  color: #33405F;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.5rem;
}

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

.page-about .about-hero__stats {
  list-style: none;
  margin: 2rem 0 0;
  padding: 1.35rem 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem 1.25rem;
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
}

.page-about .stat__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.6rem, 5vw, 2.35rem);
  line-height: 1;
  color: var(--clay-deep);
}

.page-about .stat__label {
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--slate);
}

.page-about .stat__unit {
  font-size: 0.62em;
  margin-left: 0.08em;
}

/* ---------- 章节目录 ---------- */

.page-about .about-toc {
  position: sticky;
  top: 0;
  z-index: 6;
  background: rgba(247, 243, 236, 0.94);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.page-about .about-toc__list {
  list-style: none;
  display: flex;
  gap: 0.4rem;
  margin: 0;
  padding: 0.6rem 0;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc__list a {
  display: inline-block;
  padding: 0.34rem 0.85rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--night);
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 180ms var(--ease), border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  background: var(--night);
  border-color: var(--night);
  color: var(--mist);
}

/* ---------- 起源 ---------- */

.page-about .about-origin {
  padding-top: 3rem;
  padding-bottom: 2.25rem;
}

.page-about .about-origin__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}

.page-about .about-origin__head h2 {
  margin: 0.45rem 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.65rem, 4.6vw, 2.6rem);
  line-height: 1.2;
  color: var(--night);
}

.page-about .about-origin__body p {
  margin: 0 0 1rem;
  max-width: 68ch;
  line-height: 1.8;
  color: #33405F;
}

.page-about .about-origin__body p:first-child::first-letter {
  float: left;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 3.3rem;
  line-height: 0.86;
  margin: 0.24rem 0.6rem 0 0;
  color: var(--clay);
}

.page-about .about-origin__stripes {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.5rem;
  height: 74px;
}

.page-about .about-origin__stripes span {
  flex: 1 1 0;
  border-radius: 18px 4px 18px 4px;
}

.page-about .about-origin__stripes span:nth-child(1) {
  background: linear-gradient(135deg, rgba(196, 71, 43, 0.85), rgba(196, 71, 43, 0.34));
}

.page-about .about-origin__stripes span:nth-child(2) {
  background: linear-gradient(135deg, rgba(15, 138, 106, 0.8), rgba(47, 191, 147, 0.3));
  flex-grow: 1.6;
}

.page-about .about-origin__stripes span:nth-child(3) {
  background: linear-gradient(135deg, rgba(240, 180, 41, 0.85), rgba(240, 180, 41, 0.3));
  flex-grow: 0.7;
}

/* ---------- 流程 ---------- */

.page-about .about-process {
  padding-top: 2.5rem;
  padding-bottom: 2.5rem;
  background: linear-gradient(180deg, transparent, rgba(217, 222, 231, 0.28) 40%, transparent);
}

.page-about .about-process h2 {
  margin: 0.45rem 0 0.75rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.65rem, 4.6vw, 2.6rem);
  line-height: 1.2;
  color: var(--night);
}

.page-about .about-flow {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  counter-reset: none;
}

.page-about .about-flow__step {
  position: relative;
  padding: 1.35rem 1.25rem 1.35rem 1.35rem;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 4px solid var(--jade);
  border-radius: 4px 20px 20px 4px;
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease), border-left-color 220ms var(--ease);
}

.page-about .about-flow__step:hover,
.page-about .about-flow__step:focus-within {
  transform: translateX(4px);
  border-left-color: var(--amber);
  box-shadow: var(--shadow-card);
}

.page-about .about-flow__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--jade);
  margin-bottom: 0.35rem;
}

.page-about .about-flow__step h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--night);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: #46536E;
}

.page-about .about-process__figure {
  margin: 2rem 0 0;
}

.page-about .about-process__roster {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-process__roster-item {
  background: var(--mist);
  padding: 1.25rem 1.15rem;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.page-about .about-process__count {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 2rem;
  line-height: 1;
  color: var(--clay);
  flex: 0 0 auto;
  min-width: 2.2ch;
}

.page-about .about-process__roster-item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: #46536E;
}

/* ---------- 读者 ---------- */

.page-about .about-readers {
  padding-top: 2.5rem;
  padding-bottom: 2.5rem;
}

.page-about .about-readers__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  align-items: center;
}

.page-about .about-readers__intro h2 {
  margin: 0.45rem 0 0.75rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.65rem, 4.6vw, 2.6rem);
  line-height: 1.2;
  color: var(--night);
}

.page-about .about-readers__intro p {
  margin: 0;
  max-width: 52ch;
  line-height: 1.8;
  color: #33405F;
}

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

.page-about .about-readers__list {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .about-readers__item {
  padding: 1.35rem 1.2rem;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--about-radius-organic);
}

.page-about .about-readers__item:nth-child(even) {
  border-radius: 8px 26px 8px 26px;
  background: linear-gradient(160deg, #FFFFFF, #FBF8F2);
}

.page-about .about-readers__item h3 {
  margin: 0.7rem 0 0.5rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.0625rem;
  color: var(--night);
}

.page-about .about-readers__item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: #46536E;
}

/* ---------- 伙伴 ---------- */

.page-about .about-partners {
  padding-top: 2.5rem;
  padding-bottom: 2.75rem;
  background:
    radial-gradient(80% 60% at 100% 0%, rgba(240, 180, 41, 0.14), transparent 60%),
    linear-gradient(180deg, transparent, rgba(22, 32, 63, 0.04));
}

.page-about .about-partners h2 {
  margin: 0.45rem 0 0.75rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.65rem, 4.6vw, 2.6rem);
  line-height: 1.2;
  color: var(--night);
}

.page-about .about-partners__grid {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.1rem;
}

.page-about .about-partners__card {
  padding: 1.5rem 1.35rem;
  border-radius: 30px 10px 30px 10px;
  color: var(--night);
  border: 1px solid transparent;
}

.page-about .about-partners__card:nth-child(even) {
  border-radius: 10px 30px 10px 30px;
}

.page-about .about-partners__card h3 {
  margin: 0 0 0.6rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.1875rem;
}

.page-about .about-partners__card > p {
  margin: 0 0 0.9rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: #3A4761;
}

.page-about .about-partners__card--clay {
  background: rgba(196, 71, 43, 0.12);
  border-color: rgba(196, 71, 43, 0.28);
}

.page-about .about-partners__card--jade {
  background: rgba(15, 138, 106, 0.12);
  border-color: rgba(15, 138, 106, 0.28);
}

.page-about .about-partners__card--amber {
  background: rgba(240, 180, 41, 0.18);
  border-color: rgba(240, 180, 41, 0.4);
}

.page-about .about-partners__card--night {
  background: rgba(22, 32, 63, 0.08);
  border-color: rgba(22, 32, 63, 0.2);
}

.page-about .about-partners__card .disclosure__panel p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: #3A4761;
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  padding-top: 2.75rem;
  padding-bottom: 3rem;
  background:
    radial-gradient(90% 70% at 8% 0%, rgba(196, 71, 43, 0.28), transparent 60%),
    linear-gradient(180deg, #16203F 0%, #1D2848 100%);
  color: var(--mist);
}

.page-about .about-timeline .eyebrow {
  color: var(--amber);
}

.page-about .about-timeline h2 {
  margin: 0.45rem 0 0.75rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.65rem, 4.6vw, 2.6rem);
  line-height: 1.2;
  color: var(--mist);
}

.page-about .about-timeline__lede {
  margin: 0;
  max-width: 56ch;
  line-height: 1.8;
  color: #C6CEE2;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0 0 0 1.55rem;
  position: relative;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 0.36rem;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--clay), var(--amber) 45%, var(--jade-bright));
  opacity: 0.75;
}

.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 0.6rem;
  padding-bottom: 0.6rem;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.55rem;
  top: 1.15rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(240, 180, 41, 0.16);
}

.page-about .about-timeline__item .disclosure__trigger {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 0.9rem;
  text-align: left;
  padding: 0.85rem 1rem;
  background: rgba(39, 50, 90, 0.62);
  border: 1px solid rgba(217, 222, 231, 0.16);
  border-radius: 4px 18px 18px 4px;
  color: var(--mist);
  cursor: pointer;
  transition: background-color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-timeline__item .disclosure__trigger:hover,
.page-about .about-timeline__item .disclosure__trigger:focus-visible {
  background: rgba(39, 50, 90, 0.95);
  border-color: rgba(240, 180, 41, 0.55);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: 0.04em;
  color: var(--amber);
  flex: 0 0 auto;
}

.page-about .about-timeline__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--mist);
}

.page-about .about-timeline__item .disclosure__panel {
  padding: 0.9rem 1rem 0.3rem;
}

.page-about .about-timeline__item .disclosure__panel p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: #C6CEE2;
}

/* ---------- 长期做法 ---------- */

.page-about .about-principles {
  padding-top: 2.75rem;
  padding-bottom: 2.75rem;
}

.page-about .about-principles h2 {
  margin: 0.45rem 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.65rem, 4.6vw, 2.6rem);
  line-height: 1.2;
  color: var(--night);
}

.page-about .about-principles__grid {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
}

.page-about .about-principles__item {
  padding-top: 1rem;
  border-top: 2px solid var(--line);
}

.page-about .about-principles__item:nth-child(1) {
  border-top-color: var(--clay);
}

.page-about .about-principles__item:nth-child(2) {
  border-top-color: var(--jade);
}

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

.page-about .about-principles__item:nth-child(4) {
  border-top-color: var(--night);
}

.page-about .about-principles__mark {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.page-about .about-principles__item h3 {
  margin: 0.5rem 0 0.55rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--night);
}

.page-about .about-principles__item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: #46536E;
}

/* ---------- 合作 ---------- */

.page-about .about-cooperate {
  padding-top: 2.5rem;
  padding-bottom: 3.5rem;
}

.page-about .about-cooperate__panel {
  position: relative;
  padding: 2rem 1.4rem;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(90% 100% at 100% 0%, rgba(240, 180, 41, 0.2), transparent 58%),
    linear-gradient(160deg, #16203F, #27325A);
  color: var(--mist);
  overflow: hidden;
}

.page-about .about-cooperate__panel::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: rgba(196, 71, 43, 0.28);
  filter: blur(2px);
  pointer-events: none;
}

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

.page-about .about-cooperate__text .eyebrow {
  color: var(--amber);
}

.page-about .about-cooperate__text h2 {
  margin: 0.45rem 0 0.7rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.6rem, 4.6vw, 2.4rem);
  line-height: 1.2;
  color: var(--mist);
}

.page-about .about-cooperate__text p {
  margin: 0;
  max-width: 52ch;
  line-height: 1.8;
  color: #C6CEE2;
}

.page-about .about-cooperate__list {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .about-cooperate__list li {
  padding: 1.05rem 1.1rem;
  background: rgba(247, 243, 236, 0.07);
  border: 1px solid rgba(247, 243, 236, 0.16);
  border-radius: var(--radius);
}

.page-about .about-cooperate__list h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.0625rem;
  color: var(--mist);
}

.page-about .about-cooperate__list p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: #BEC8DE;
}

.page-about .about-cooperate__actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.75rem;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.1rem;
  }

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

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

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

  .page-about .about-principles__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.75rem 2rem;
  }

  .page-about .about-cooperate__panel {
    padding: 2.5rem 2.25rem;
  }

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

@media (min-width: 1000px) {
  .page-about .about-hero {
    padding: 2.25rem 0 3.25rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.85fr);
    gap: 2.75rem;
    align-items: center;
  }

  .page-about .about-origin__inner {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: 2.5rem;
  }

  .page-about .about-readers__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
    gap: 2.5rem;
  }

  .page-about .about-flow__step {
    padding: 1.6rem 1.5rem;
  }

  .page-about .about-partners__grid {
    gap: 1.35rem;
  }

  .page-about .about-timeline {
    padding-top: 3.5rem;
    padding-bottom: 3.75rem;
  }

  .page-about .about-principles__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 2rem;
  }

  .page-about .about-cooperate__panel {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    padding: 3rem 3rem 3.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-flow__step,
  .page-about .about-toc__list a,
  .page-about .about-timeline__item .disclosure__trigger {
    transition: none;
  }

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