/* ===== 平台介绍 ===== */

.page-about {
  background: var(--ink);
  color: var(--haze);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 44px) 0 clamp(58px, 8vw, 120px);
  background:
    radial-gradient(90% 70% at 88% 4%, rgba(255, 122, 47, 0.18), transparent 62%),
    radial-gradient(70% 60% at 6% 96%, rgba(108, 92, 231, 0.14), transparent 66%),
    linear-gradient(180deg, var(--ink) 0%, var(--pitch) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: clamp(48px, 8vw, 104px);
  background: linear-gradient(180deg, transparent, rgba(233, 239, 233, 0.07));
  clip-path: polygon(0 100%, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .crumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 clamp(34px, 6vw, 76px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about .crumb a:hover,
.page-about .crumb a:focus-visible {
  color: var(--orange-soft);
  border-bottom-color: var(--orange-soft);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(34px, 5vw, 64px);
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: end;
    gap: clamp(40px, 6vw, 88px);
  }
}

.page-about .about-hero__lead .eyebrow {
  color: var(--orange);
  margin: 0;
}

.page-about .about-hero__lead .display-title {
  margin: clamp(14px, 2vw, 22px) 0 0;
  color: var(--haze);
}

.page-about .about-hero__lead .lede {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  max-width: 36em;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(26px, 3.4vw, 40px);
}

.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: rgba(47, 90, 63, 0.55);
  border: 1px solid rgba(47, 90, 63, 0.75);
}

.page-about .about-stat {
  background: rgba(12, 21, 17, 0.82);
  padding: clamp(16px, 2vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: background-color 0.3s ease;
}

.page-about .about-stat:hover {
  background: rgba(30, 58, 42, 0.86);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 2.6vw, 36px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 章节色带 ---------- */
.page-about .about-band {
  position: relative;
  padding-block: clamp(58px, 8vw, 128px);
}

.page-about .about-band--paper {
  background: var(--haze);
  color: var(--ink);
}

.page-about .about-band--ink {
  background: var(--ink);
  color: var(--haze);
}

.page-about .about-band--pitch {
  background: linear-gradient(180deg, var(--pitch) 0%, var(--ink) 100%);
  color: var(--haze);
}

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

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
}

@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: minmax(200px, 0.38fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 92px);
    align-items: start;
  }

  .page-about .about-chapter__index {
    position: sticky;
    top: clamp(96px, 13vh, 148px);
  }
}

.page-about .about-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.32em;
  color: var(--orange);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--orange);
}

.page-about .about-chapter__index .headline {
  margin: clamp(14px, 1.8vw, 22px) 0 0;
  font-weight: 300;
  letter-spacing: -0.01em;
}

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

.page-about .about-band--paper .about-chapter__body {
  color: #26342b;
}

.page-about .about-band--ink .about-chapter__body,
.page-about .about-band--pitch .about-chapter__body {
  color: #c4d3c6;
}

.page-about .about-chapter__body > p {
  margin: 0 0 1.1em;
}

.page-about .about-chapter__body > p:last-child {
  margin-bottom: 0;
}

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

/* ---------- 01 三个落点 ---------- */
.page-about .about-points {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 28px);
  margin-top: clamp(30px, 4vw, 46px);
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid rgba(12, 21, 17, 0.16);
}

@media (min-width: 700px) {
  .page-about .about-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-point__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-point p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: #4a5a4e;
}

/* ---------- 02 五条线 ---------- */
.page-about .about-lines {
  list-style: none;
  margin: clamp(26px, 3.6vw, 44px) 0 0;
  padding: 0;
  border-top: 1px solid rgba(47, 90, 63, 0.6);
}

.page-about .about-line {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: clamp(12px, 2vw, 24px);
  padding: clamp(16px, 2.2vw, 24px) clamp(6px, 1.2vw, 14px);
  border-bottom: 1px solid rgba(47, 90, 63, 0.6);
  transition: background-color 0.3s ease, transform 0.3s ease;
}

.page-about .about-line:hover {
  background: rgba(30, 58, 42, 0.6);
  transform: translateX(4px);
}

.page-about .about-line__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
  padding-top: 5px;
}

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

.page-about .about-line__title {
  margin: 0 0 6px;
  font-size: clamp(18px, 1.4vw, 21px);
  font-weight: 700;
  color: var(--haze);
}

.page-about .about-line__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-lines__media {
  margin-top: clamp(32px, 4.5vw, 56px);
}

/* ---------- 03 时间线 ---------- */
.page-about .about-history {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 52px);
}

@media (min-width: 1200px) {
  .page-about .about-history {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.58fr);
    align-items: start;
  }
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange) 0%, rgba(47, 90, 63, 0.35) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: clamp(30px, 5vw, 42px);
  padding-bottom: clamp(26px, 3.6vw, 42px);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, 0.18);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  transform: scale(1.22);
  box-shadow: 0 0 0 7px rgba(255, 122, 47, 0.22);
}

.page-about .about-timeline__phase {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
  text-transform: uppercase;
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.3vw, 20px);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: #4a5a4e;
  max-width: 46ch;
}

/* ---------- 04 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 4vw, 46px);
  background: rgba(47, 90, 63, 0.6);
  border: 1px solid rgba(47, 90, 63, 0.6);
}

@media (min-width: 760px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-team__cell {
  background: var(--pitch);
  padding: clamp(18px, 2.2vw, 26px);
  min-height: 172px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background-color 0.3s ease;
}

.page-about .about-team__cell:hover {
  background: var(--tier);
}

.page-about .about-team__figure {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 3vw, 44px);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-team__role {
  font-size: 15px;
  font-weight: 700;
  color: var(--haze);
}

.page-about .about-team__desc {
  margin-top: auto;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-flow {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(10px, 1.4vw, 16px);
}

@media (min-width: 760px) {
  .page-about .about-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

.page-about .about-flow li {
  padding-top: 12px;
  border-top: 2px solid var(--orange);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-flow li span {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--orange-soft);
}

/* ---------- 05 合作生态 ---------- */
.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 54px);
  align-items: center;
}

@media (min-width: 900px) {
  .page-about .about-eco {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

.page-about .about-eco__text .prose {
  margin: 0;
}

.page-about .about-eco__list {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-eco__list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(12, 21, 17, 0.12);
  font-size: 15px;
  line-height: 1.75;
  color: #3a4a3f;
}

.page-about .about-eco__list b {
  flex: 0 0 auto;
  min-width: 54px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--violet);
}

.page-about .about-network {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 06 本地运营 ---------- */
.page-about .about-local {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 40px);
}

@media (min-width: 900px) {
  .page-about .about-local {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    align-items: center;
    gap: clamp(32px, 5vw, 64px);
  }
}

.page-about .about-local__text p {
  margin: 0 0 1em;
  font-size: var(--step-0);
  line-height: 1.85;
  color: #c4d3c6;
}

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

.page-about .about-local__text a {
  color: var(--orange-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 178, 122, 0.4);
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-local__text a:hover,
.page-about .about-local__text a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  max-width: 62ch;
}

.page-about .about-cta .eyebrow {
  margin: 0;
  color: var(--orange);
}

.page-about .about-cta .headline {
  margin: 0;
  font-weight: 300;
}

.page-about .about-cta .lede {
  margin: 0;
  color: var(--mist);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 6px;
}

/* ---------- 窄屏收尾 ---------- */
@media (max-width: 480px) {
  .page-about .about-hero__stats {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

  .page-about .about-line {
    grid-template-columns: 34px minmax(0, 1fr);
  }
}

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