/* ================= 页面：品牌与团队 ================= */
.page-about {
  --about-grid-line: rgba(217, 220, 207, 0.07);
  --about-grid-line-paper: rgba(20, 17, 15, 0.06);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.5rem, 4vw, 3rem) clamp(2.5rem, 6vw, 5rem);
  background-image:
    linear-gradient(to right, var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  background-position: -1px -1px;
}

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

.page-about .about-hero__title {
  max-width: 22ch;
  margin: 0.9rem 0 0;
  color: var(--paper);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
}

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

.page-about .about-facts li {
  background: var(--green-2);
  padding: 0.85rem 1rem 0.95rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 0;
}

.page-about .about-facts__k {
  font-size: var(--fs-small);
  color: var(--muted);
  letter-spacing: 0.04em;
}

.page-about .about-facts__v {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.2rem;
  line-height: 1.2;
  color: var(--lime);
  word-break: break-word;
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

/* ---------- 通用区块间距 ---------- */
.page-about .about-block {
  padding-block: clamp(2.25rem, 5.5vw, 4.5rem);
}

.page-about .about-sub {
  font-size: var(--fs-h3);
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
}

.page-about .about-text {
  margin: 0 0 1rem;
  line-height: 1.75;
  max-width: 68ch;
}

.page-about .about-text--tight {
  margin-top: 1.25rem;
}

.page-about .about-inline-link {
  margin: clamp(1.5rem, 3vw, 2rem) 0 0;
  font-size: var(--fs-small);
  color: var(--muted);
}

.page-about .section--paper .about-inline-link {
  color: rgba(20, 17, 15, 0.62);
}

/* ---------- 01 四类内容卡片 ---------- */
.page-about .about-cards {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-card {
  border-top: 3px solid var(--olive);
  padding-top: 1.1rem;
  transition: border-color 0.25s ease;
}

.page-about .about-card:hover {
  border-top-color: var(--lime);
}

.page-about .about-card .chip {
  display: inline-block;
  margin-bottom: 0.65rem;
}

.page-about .about-card .card__title {
  margin: 0 0 0.5rem;
}

/* ---------- 02 团队 ---------- */
.page-about .about-band {
  margin: clamp(1.5rem, 4vw, 2.5rem) 0;
}

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

.page-about .about-team {
  align-items: start;
  row-gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-plates {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .about-plates .plate {
  background: rgba(20, 17, 15, 0.04);
  border-left: 3px solid var(--olive);
  padding: 0.75rem 0.95rem;
}

/* ---------- 03 六级阶梯 ---------- */
.page-about .about-ladder {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .about-rung {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-top: 3px solid var(--olive);
  padding: 0.9rem 1rem 1.05rem;
  min-width: 0;
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.page-about .about-rung:hover {
  border-top-color: var(--corner);
  border-color: var(--line-strong);
}

.page-about .about-rung__code {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--corner);
}

.page-about .about-rung__title {
  font-size: 1rem;
  margin: 0.4rem 0 0.45rem;
  color: var(--fg);
}

.page-about .about-rung__text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-level-figure {
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  max-width: 900px;
}

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

@media (min-width: 900px) {
  .page-about .about-ladder {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    align-items: start;
    gap: 0.75rem;
  }

  .page-about .about-rung:nth-child(1) { margin-top: 0; }
  .page-about .about-rung:nth-child(2) { margin-top: 1.15rem; }
  .page-about .about-rung:nth-child(3) { margin-top: 2.3rem; }
  .page-about .about-rung:nth-child(4) { margin-top: 3.45rem; }
  .page-about .about-rung:nth-child(5) { margin-top: 4.6rem; }
  .page-about .about-rung:nth-child(6) { margin-top: 5.75rem; }
}

/* ---------- 04 更新节奏 ---------- */
.page-about .about-rhythm {
  align-items: start;
  row-gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-rhythm .chapter-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--corner);
  margin-bottom: 0.5rem;
}

.page-about .rhythm-list {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .rhythm-list li {
  background: var(--card-bg);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.2rem;
  padding: 0.7rem 0.9rem 0.8rem;
}

.page-about .rhythm-list__k {
  font-size: var(--fs-small);
  color: var(--muted);
  letter-spacing: 0.03em;
}

.page-about .rhythm-list__v {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--lime);
  word-break: break-word;
}

@media (min-width: 640px) {
  .page-about .rhythm-list li {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: baseline;
    gap: 1rem;
  }
}

/* ---------- 05 质量流程 ---------- */
.page-about .about-quality {
  margin-top: clamp(1.25rem, 3vw, 2rem);
  align-items: start;
  row-gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: 0.9rem;
  padding: 0.95rem 0 1.05rem;
  border-bottom: 1px dashed var(--line);
  transition: border-color 0.25s ease;
}

.page-about .about-step:first-child {
  border-top: 1px dashed var(--line);
}

.page-about .about-step:hover {
  border-bottom-color: var(--corner);
}

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--corner);
}

.page-about .about-step__title {
  font-size: var(--fs-h3);
  margin: 0 0 0.35rem;
  letter-spacing: -0.01em;
}

.page-about .about-step__text {
  margin: 0;
  line-height: 1.7;
  color: rgba(20, 17, 15, 0.74);
  font-size: var(--fs-small);
}

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

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

/* ---------- 06 共建规范 ---------- */
.page-about .about-partners {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  row-gap: 1.25rem;
}

.page-about .about-partner {
  border-left: 3px solid var(--olive);
  padding-left: 1.1rem;
  transition: border-color 0.25s ease;
}

.page-about .about-partner:hover {
  border-left-color: var(--lime);
}

.page-about .about-partner .chip {
  display: inline-block;
  margin-bottom: 0.6rem;
}

.page-about .about-partner .card__title {
  margin: 0 0 0.5rem;
}

/* ---------- 07 里程碑时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 0 0 0 1.6rem;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.55rem;
  bottom: 0.55rem;
  width: 1px;
  background: var(--olive);
  opacity: 0.55;
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(1.5rem, 4vw, 2.25rem);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.6rem;
  top: 0.42rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--olive);
  box-shadow: 0 0 0 3px var(--night);
  transition: background-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-timeline__item:hover::before {
  background: var(--corner);
  box-shadow: 0 0 0 4px rgba(255, 92, 26, 0.2);
}

.page-about .about-timeline__season {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  color: var(--corner);
  margin-bottom: 0.35rem;
}

.page-about .about-timeline__title {
  font-size: var(--fs-h3);
  margin: 0 0 0.4rem;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 62ch;
  line-height: 1.75;
  color: var(--muted);
  font-size: var(--fs-small);
}

@media (min-width: 820px) {
  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 9.5rem minmax(0, 1fr);
    gap: 1.5rem;
    align-items: start;
  }

  .page-about .about-timeline__season {
    margin-bottom: 0;
    padding-top: 0.15rem;
    text-align: right;
  }
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  padding-block: clamp(2.5rem, 6vw, 5rem);
}

.page-about .about-cta__box {
  border: 1px solid var(--line);
  border-left: 4px solid var(--lime);
  background: var(--green-2);
  padding: clamp(1.5rem, 4vw, 2.75rem);
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-cta__lead .h2 {
  margin: 0.4rem 0 0.75rem;
}

.page-about .about-cta__lead .about-text {
  color: var(--muted);
  margin: 0;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

@media (min-width: 820px) {
  .page-about .about-cta__box {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-step {
    grid-template-columns: 1.9rem minmax(0, 1fr);
    gap: 0.7rem;
  }

  .page-about .about-step__num {
    font-size: 1.25rem;
  }

  .page-about .about-timeline {
    padding-left: 1.3rem;
  }

  .page-about .about-timeline__item::before {
    left: -1.3rem;
  }

  .page-about .about-cta__actions .btn {
    width: 100%;
    text-align: center;
  }
}