/* ============================================================
   品牌沿革 / page-about
   纵向时间轴 + 档案柜式叙事
   ============================================================ */

.page-about {
  --tl-year: 62px;
  --tl-gap: 14px;
  --tl-axis: calc(var(--tl-year) + var(--tl-gap) / 2);
  display: block;
}

/* ---------- 首屏：框景 + 指挥中心底噪 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--ink-2);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: -2;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.28;
  filter: saturate(0.75) contrast(1.06);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(120% 78% at 82% 10%, rgba(53, 224, 208, 0.15), transparent 58%),
    linear-gradient(180deg, rgba(8, 13, 26, 0.6) 0%, rgba(8, 13, 26, 0.9) 56%, var(--ink-0) 100%);
}

.page-about .about-hero__inner {
  padding-top: 84px;
  padding-bottom: 46px;
}

.page-about .about-hero .eyebrow {
  margin: 18px 0 0;
  color: var(--cyan);
  letter-spacing: 0.16em;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  max-width: 880px;
  font-size: clamp(30px, 5.6vw, 52px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-hero .lead {
  margin: 20px 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
  opacity: 0.84;
}

.page-about .about-figures {
  list-style: none;
  margin: 34px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-2);
  border: 1px solid var(--ink-2);
}

.page-about .about-figures li {
  background: rgba(8, 13, 26, 0.88);
  padding: 14px 16px 16px;
}

.page-about .fig-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .fig-label {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--dim);
}

/* ---------- 通用区块 ---------- */

.page-about .about-section {
  padding: 60px 0;
  border-bottom: 1px solid var(--ink-2);
}

.page-about .about-section:last-of-type {
  border-bottom: 0;
}

.page-about .about-section .section-head {
  margin-bottom: 28px;
}

.page-about .about-section h2 {
  margin: 0;
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1.24;
  color: var(--text);
}

.page-about .about-section .section-head__meta {
  color: var(--dim);
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  list-style: none;
  position: relative;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: var(--tl-axis);
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--ink-2) 42%, var(--ink-2) 86%, transparent 100%);
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: var(--tl-year) minmax(0, 1fr);
  gap: var(--tl-gap);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: 24px;
  left: var(--tl-axis);
  width: 9px;
  height: 9px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: var(--ink-0);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 224, 208, 0.1);
  z-index: 2;
}

.page-about .timeline__year {
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-align: right;
  color: var(--cyan);
}

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

.page-about .timeline__card h3 {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.38;
}

.page-about .timeline__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
}

.page-about .timeline__metric {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed rgba(15, 21, 36, 0.24);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.07em;
  color: rgba(15, 21, 36, 0.62);
}

/* ---------- 团队分组 ---------- */

.page-about .team-grid {
  display: grid;
  gap: 26px;
}

.page-about .team-map__scroll {
  overflow-x: auto;
  padding-bottom: 8px;
  border: 1px solid var(--ink-2);
  background: var(--ink-0);
}

.page-about .team-map {
  display: block;
  width: 100%;
  min-width: 620px;
  height: auto;
}

.page-about .team-map rect {
  fill: var(--ink-1);
  stroke: var(--ink-2);
  stroke-width: 1;
}

.page-about .team-map .tm-root rect {
  fill: rgba(226, 59, 50, 0.13);
  stroke: var(--red);
}

.page-about .team-map line {
  stroke: var(--ink-2);
  stroke-width: 1;
}

.page-about .team-map text {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  fill: var(--text);
}

.page-about .team-map .tm-desc {
  font-size: 13px;
  font-weight: 400;
  fill: var(--dim);
}

.page-about .team-map .tm-sub {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.1em;
  fill: var(--cyan);
}

.page-about .team-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--dim);
}

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

/* ---------- 内容来源 ---------- */

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

.page-about .source-copy p {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--dim);
}

.page-about .source-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .source-list li {
  position: relative;
  padding: 12px 0 12px 22px;
  border-top: 1px solid var(--ink-2);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .source-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 10px;
  height: 1px;
  background: var(--cyan);
}

.page-about .source-list a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, 0.4);
}

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

/* ---------- 每周节奏 ---------- */

.page-about .cadence {
  list-style: none;
  margin: 30px 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--ink-2);
  border: 1px solid var(--ink-2);
}

.page-about .cadence__item {
  position: relative;
  background: var(--ink-1);
  padding: 20px 18px 24px;
}

.page-about .cadence__item::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 2px;
  background: var(--cyan);
  opacity: 0.45;
}

.page-about .cadence__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .cadence__item h3 {
  margin: 10px 0 8px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--text);
}

.page-about .cadence__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--dim);
}

.page-about .cadence-note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--red);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.9;
  letter-spacing: 0.02em;
  color: var(--dim);
}

/* ---------- 服务人群 ---------- */

.page-about .audience-figure {
  margin: 0 0 26px;
}

.page-about .audience {
  display: grid;
  gap: 16px;
}

.page-about .audience__item {
  position: relative;
  border: 1px solid var(--ink-2);
  background: var(--ink-1);
  padding: 20px 18px 22px;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.page-about .audience__item:hover {
  border-color: rgba(53, 224, 208, 0.45);
  transform: translateY(-2px);
}

.page-about .audience__tag {
  display: inline-block;
  padding: 2px 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-0);
  background: var(--cyan);
}

.page-about .audience__item h3 {
  margin: 12px 0 10px;
  font-size: 18px;
  line-height: 1.42;
  color: var(--text);
}

.page-about .audience__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--dim);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta__card {
  max-width: 820px;
}

.page-about .about-cta__card h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 3.6vw, 30px);
  line-height: 1.3;
}

.page-about .about-cta__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-cta .btn-row {
  margin-top: 22px;
}

.page-about .about-cta .btn--ghost {
  color: var(--paper-ink);
  border-color: rgba(15, 21, 36, 0.42);
}

/* ---------- 响应式 ---------- */

@media (min-width: 768px) {
  .page-about {
    --tl-year: 96px;
    --tl-gap: 26px;
  }

  .page-about .about-hero__inner {
    padding-top: 104px;
    padding-bottom: 56px;
  }

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

  .page-about .about-section {
    padding: 76px 0;
  }

  .page-about .timeline {
    gap: 26px;
  }

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

@media (min-width: 900px) {
  .page-about .source-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: 44px;
  }

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

  .page-about .audience {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .audience__item:nth-child(1) {
    grid-column: span 4;
  }

  .page-about .audience__item:nth-child(2) {
    grid-column: span 2;
  }

  .page-about .audience__item:nth-child(3) {
    grid-column: span 2;
  }

  .page-about .audience__item:nth-child(4) {
    grid-column: span 4;
  }
}

@media (min-width: 1024px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
    gap: 40px;
  }

  .page-about .about-section h2 {
    max-width: 22ch;
  }
}

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