/* ============================================================
   品牌故事页 · 页面专属样式（作用域：.page-about）
   ============================================================ */

.page-about {
  --about-axis: 18px;
  --about-card-w: 100%;
  --about-dot: 11px;
}

/* ---------- 首屏 ---------- */

.page-about .about-open {
  position: relative;
  padding: 30px 0 56px;
  background-color: var(--void);
  background-image:
    radial-gradient(760px 340px at 86% -18%, rgba(255, 75, 31, 0.18), transparent 72%),
    linear-gradient(180deg, rgba(20, 26, 58, 0.55), transparent 78%);
}

.page-about .about-open::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--line-soft);
}

.page-about .about-open__grid {
  display: grid;
  gap: 34px;
  margin-top: 26px;
}

.page-about .about-open__title {
  margin: 14px 0 18px;
  font-family: var(--font-head);
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ice);
  max-width: 20ch;
}

.page-about .about-open__lede {
  max-width: 46ch;
  color: var(--text-body);
  margin: 0;
}

.page-about .about-open__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line-soft);
  border-top: 1px solid var(--line-warm);
}

.page-about .about-open__fact {
  background: var(--carbon);
  padding: 16px 16px 18px;
  min-width: 0;
}

.page-about .about-open__fact dt {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--steel);
  margin-bottom: 8px;
}

.page-about .about-open__fact dd {
  margin: 0;
  font-family: var(--font-data);
  font-size: 18px;
  line-height: 1.35;
  color: var(--ice);
  font-variant-numeric: tabular-nums;
  word-break: break-word;
}

.page-about .about-open__fact:nth-child(odd) {
  border-left: 2px solid var(--flame);
}

/* ---------- 成长节点：纵向时间线 ---------- */

.page-about .about-line {
  padding: 54px 0 62px;
  background-color: var(--void);
}

.page-about .about-line__heading {
  max-width: 22ch;
}

.page-about .about-line__lede {
  max-width: 54ch;
  margin-top: 14px;
}

.page-about .about-line__figure {
  margin: 30px 0 40px;
}

.page-about .about-line__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 30px;
}

.page-about .about-line__list::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: var(--about-axis);
  width: 1px;
  background: linear-gradient(
    180deg,
    var(--flame) 0%,
    rgba(255, 75, 31, 0.34) 32%,
    rgba(126, 144, 166, 0.22) 70%,
    rgba(126, 144, 166, 0.08) 100%
  );
}

.page-about .about-line__item {
  position: relative;
  padding-left: calc(var(--about-axis) + 28px);
  min-width: 0;
}

.page-about .about-line__item:nth-child(1) { --about-card-w: 100%; }
.page-about .about-line__item:nth-child(2) { --about-card-w: 95%; }
.page-about .about-line__item:nth-child(3) { --about-card-w: 90%; }
.page-about .about-line__item:nth-child(4) { --about-card-w: 85%; }
.page-about .about-line__item:nth-child(5) { --about-card-w: 80%; }

.page-about .about-line__dot {
  position: absolute;
  left: calc(var(--about-axis) - 5px);
  top: 14px;
  width: var(--about-dot);
  height: var(--about-dot);
  background: var(--void);
  border: 2px solid var(--flame);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(255, 75, 31, 0.1);
}

.page-about .about-line__card {
  width: 100%;
  max-width: var(--about-card-w);
  background: var(--carbon);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--line-warm);
  padding: 20px 20px 22px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-line__card:hover {
  border-color: var(--line);
  border-left-color: var(--flame);
  transform: translateY(-3px);
}

.page-about .about-line__year {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--flame);
  font-variant-numeric: tabular-nums;
}

.page-about .about-line__phase {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .about-line__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 19px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .about-line__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-body);
  max-width: 46ch;
}

/* ---------- 运营中心 ---------- */

.page-about .about-hub {
  padding: 60px 0;
  background-color: var(--indigo);
  background-image: linear-gradient(140deg, rgba(11, 42, 44, 0.6), rgba(10, 12, 18, 0.9));
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hub__grid {
  display: grid;
  gap: 34px;
}

.page-about .about-hub__title {
  margin: 14px 0 20px;
  font-family: var(--font-head);
  font-size: clamp(25px, 4.4vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ice);
  max-width: 18ch;
}

.page-about .about-hub .pa-prose {
  margin: 0 0 16px;
  color: var(--text-body);
  font-size: 16px;
  line-height: 1.78;
  max-width: var(--max-read);
}

.page-about .about-hub__points {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hub__points li {
  position: relative;
  padding: 14px 0 14px 20px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-body);
}

.page-about .about-hub__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 8px;
  height: 2px;
  background: var(--flame);
}

.page-about .about-hub__points .pa-num {
  color: var(--cyan);
  font-family: var(--font-data);
}

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

/* ---------- 团队分工 ---------- */

.page-about .about-team {
  padding: 60px 0;
  background-color: var(--carbon);
}

.page-about .about-team__heading {
  max-width: 22ch;
}

.page-about .about-team__lede {
  max-width: 52ch;
  margin-top: 14px;
}

.page-about .about-team__bar {
  display: flex;
  gap: 4px;
  list-style: none;
  margin: 34px 0 26px;
  padding: 0;
  height: 72px;
}

.page-about .about-team__seg {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  min-width: 0;
  padding: 8px 10px;
  transition: filter 0.22s var(--ease);
}

.page-about .about-team__seg:nth-child(1) {
  flex: 20;
  background: var(--flame);
  color: var(--void);
}

.page-about .about-team__seg:nth-child(2) {
  flex: 12;
  background: var(--cyan);
  color: var(--void);
}

.page-about .about-team__seg:nth-child(3) {
  flex: 14;
  background: var(--wine);
  color: var(--ice);
}

.page-about .about-team__seg:nth-child(4) {
  flex: 12;
  background: var(--void);
  color: var(--ice);
  border: 1px solid var(--line);
}

.page-about .about-team__seg-name {
  font-size: 13px;
  line-height: 1.2;
  letter-spacing: 0.02em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.page-about .about-team__seg-num {
  font-family: var(--font-data);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__seg::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: calc(100% + 10px);
  transform: translateX(-50%) translateY(6px);
  padding: 6px 11px;
  background: var(--ice);
  color: var(--void);
  font-size: 12px;
  line-height: 1.4;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
  z-index: 6;
}

.page-about .about-team__seg:nth-child(1)::after { content: "盯开哨与完场，铺开每日赛程条目"; }
.page-about .about-team__seg:nth-child(2)::after { content: "守住指标采集链路与刷新节奏"; }
.page-about .about-team__seg:nth-child(3)::after { content: "按六周一轮的节奏发版上新入口"; }
.page-about .about-team__seg:nth-child(4)::after { content: "接住订阅、同步与导出的每一处卡点"; }

.page-about .about-team__seg:hover,
.page-about .about-team__seg:focus-visible {
  filter: brightness(1.14);
}

.page-about .about-team__seg:hover::after,
.page-about .about-team__seg:focus-visible::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.page-about .about-team__duties {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line);
}

.page-about .about-team__duty {
  background: var(--void);
  padding: 20px 20px 22px;
  min-width: 0;
}

.page-about .about-team__duty-name {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .about-team__duty-name .pa-num {
  font-family: var(--font-data);
  color: var(--flame);
}

.page-about .about-team__duty p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text-body);
  max-width: 44ch;
}

.page-about .about-team__figure {
  margin: 34px 0 0;
}

/* ---------- 能力构成：内容线与数据线 ---------- */

.page-about .about-lines {
  padding: 60px 0;
  background-color: var(--void);
}

.page-about .about-lines__heading {
  max-width: 20ch;
}

.page-about .about-lines__lede {
  max-width: 52ch;
  margin-top: 14px;
}

.page-about .about-lines__panels {
  display: grid;
  gap: 22px;
  margin-top: 36px;
}

.page-about .about-lines__panel {
  position: relative;
  padding: 30px 22px 28px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), 0 100%);
}

.page-about .about-lines__panel--content {
  background-image: linear-gradient(150deg, rgba(74, 16, 36, 0.94), rgba(10, 12, 18, 0.86));
  border-left: 2px solid var(--flame);
}

.page-about .about-lines__panel--data {
  background-image: linear-gradient(150deg, rgba(11, 42, 44, 0.94), rgba(10, 12, 18, 0.86));
  border-left: 2px solid var(--cyan);
}

.page-about .about-lines__panel-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 22px;
  letter-spacing: -0.015em;
  color: var(--ice);
}

.page-about .about-lines__panel-note {
  margin: 0 0 20px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-about .about-lines__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-lines__list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-lines__k {
  flex: 0 0 auto;
  min-width: 62px;
  font-family: var(--font-data);
  font-size: 17px;
  font-weight: 700;
  color: var(--ice);
  font-variant-numeric: tabular-nums;
}

.page-about .about-lines__panel--content .about-lines__k { color: #FFB39B; }
.page-about .about-lines__panel--data .about-lines__k { color: var(--cyan); }

.page-about .about-lines__v {
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--text-body);
}

.page-about .about-lines__cta {
  margin: 30px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-body);
  max-width: 56ch;
}

.page-about .about-lines__cta a {
  color: var(--flame);
  text-decoration: none;
  border-bottom: 1px solid var(--line-warm);
  padding-bottom: 2px;
}

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

/* ---------- 合作与认可 ---------- */

.page-about .about-network {
  padding: 60px 0;
  background-color: var(--deepgreen);
  background-image: linear-gradient(200deg, rgba(20, 26, 58, 0.86), rgba(10, 12, 18, 0.92));
  border-top: 1px solid var(--line-soft);
}

.page-about .about-network__heading {
  max-width: 18ch;
}

.page-about .about-network__grid {
  margin-top: 34px;
}

.page-about .about-network__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-network__figure {
  margin: 0;
  font-family: var(--font-data);
  font-size: clamp(26px, 5vw, 34px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--flame);
  font-variant-numeric: tabular-nums;
}

.page-about .about-network__card .pa-card__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text-body);
}

/* ---------- 怎么开始 ---------- */

.page-about .about-next {
  padding: 60px 0 78px;
  background-color: var(--void);
}

.page-about .about-next__heading {
  max-width: 18ch;
}

.page-about .about-next__lede {
  max-width: 50ch;
  margin-top: 14px;
}

.page-about .about-next__steps {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-warm);
  border-left: 1px solid var(--line-soft);
}

.page-about .about-next__step {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--void);
  border-right: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  padding: 24px 20px 26px;
  min-width: 0;
}

.page-about .about-next__idx {
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--flame);
  font-variant-numeric: tabular-nums;
}

.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 18px;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .about-next__text {
  margin: 0;
  flex: 1 1 auto;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--text-body);
  max-width: 42ch;
}

.page-about .about-next__btn {
  align-self: flex-start;
  margin-top: 4px;
}

.page-about .about-next__foot {
  margin: 26px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-next__foot a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
}

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

/* ============================================================
   响应式
   ============================================================ */

@media (min-width: 620px) {
  .page-about .about-open__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-open {
    padding: 46px 0 72px;
  }

  .page-about .about-open__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 60px;
    align-items: end;
  }

  .page-about .about-line,
  .page-about .about-hub,
  .page-about .about-team,
  .page-about .about-lines,
  .page-about .about-network,
  .page-about .about-next {
    padding-top: 78px;
    padding-bottom: 82px;
  }

  .page-about .about-line__figure {
    margin: 36px 0 52px;
  }

  /* 时间线改为左右交错 */
  .page-about .about-line__list {
    grid-template-columns: 1fr 108px 1fr;
    gap: 0;
  }

  .page-about .about-line__list::before {
    left: calc(50% - 0.5px);
  }

  .page-about .about-line__item {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 108px 1fr;
    align-items: start;
    padding-left: 0;
    padding-bottom: 40px;
    min-width: 0;
  }

  .page-about .about-line__item .about-line__dot {
    position: static;
    grid-column: 2;
    justify-self: center;
    margin-top: 16px;
  }

  .page-about .about-line__card {
    grid-column: 1;
    justify-self: end;
    text-align: right;
  }

  .page-about .about-line__item:nth-child(even) .about-line__card {
    grid-column: 3;
    justify-self: start;
    text-align: left;
  }

  .page-about .about-line__item:nth-child(odd) .about-line__year {
    justify-content: flex-end;
  }

  .page-about .about-hub__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-lines__panels {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 30px;
  }

  .page-about .about-lines__panel {
    padding: 36px 30px 32px;
  }

  .page-about .about-network__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-team__bar {
    height: 84px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-network__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-network__grid > *:nth-child(even) {
    margin-top: 30px;
  }

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

/* 窄屏：团队条形图改为纵向堆叠，禁用悬停提示 */
@media (max-width: 700px) {
  .page-about .about-team__bar {
    flex-direction: column;
    height: auto;
    gap: 3px;
  }

  .page-about .about-team__seg:nth-child(n) {
    flex: 0 0 auto;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 14px;
  }

  .page-about .about-team__seg::after {
    display: none;
  }

  .page-about .about-team__seg-num {
    font-size: 18px;
  }
}

@media (max-width: 420px) {
  .page-about .about-open__facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-line__item {
    padding-left: calc(var(--about-axis) + 20px);
  }

  .page-about .about-next__step {
    padding: 20px 16px 22px;
  }
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-line__card,
  .page-about .about-team__seg,
  .page-about .about-team__seg::after {
    transition: none;
  }

  .page-about .about-line__card:hover {
    transform: none;
  }
}