.page-about {
  --page-gutter: clamp(18px, 4vw, 52px);
  --page-section-pad: clamp(72px, 10vw, 148px);
  --page-ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  background-color: var(--bg-deep);
  color: var(--cream);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
}

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

.page-about .about-wrap {
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: var(--page-gutter);
}

.page-about .about-breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 18px var(--page-gutter) 0;
  color: var(--gray);
}

.page-about .about-breadcrumb .breadcrumb-current {
  color: var(--gold);
  font-weight: 700;
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: 48px 0 64px;
  background:
    radial-gradient(circle at 12% 10%, rgba(214, 43, 43, 0.16) 0%, transparent 48%),
    linear-gradient(150deg, var(--bg-deep) 0%, var(--bg-panel) 75%, rgba(214, 43, 43, 0.28) 135%);
  border-bottom: 1px solid rgba(196, 139, 47, 0.35);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "296";
  position: absolute;
  right: -3%;
  top: 6%;
  font-family: var(--font-mono);
  font-size: clamp(140px, 22vw, 320px);
  font-weight: 700;
  color: rgba(232, 163, 61, 0.06);
  line-height: 1;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__copy {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 20px;
  padding-inline: var(--page-gutter);
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  margin: 0;
}

.page-about .about-hero__eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: linear-gradient(90deg, var(--red), var(--gold));
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(30px, 4.8vw, 56px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: 0.01em;
  max-width: 760px;
}

.page-about .about-hero__lead {
  max-width: 620px;
  color: #d8d3c8;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.8;
  margin: 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 10px;
  width: 100%;
}

.page-about .about-hero__actions .btn {
  width: 100%;
  text-align: center;
  justify-content: center;
}

.page-about .about-hero__visual {
  position: relative;
  z-index: 1;
  margin-inline: var(--page-gutter);
  border: 1px solid rgba(196, 139, 47, 0.5);
  background: var(--bg-panel);
  padding-bottom: 44px;
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-hero__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  margin: 0;
  padding: 10px 16px;
  font-size: 12px;
  color: var(--gray);
  border-top: 1px solid rgba(196, 139, 47, 0.28);
  background: rgba(16, 20, 31, 0.72);
  backdrop-filter: blur(6px);
}

/* ===== 区块头 ===== */
.page-about .about-sechead {
  display: grid;
  grid-template-columns: 58px 1fr;
  column-gap: 20px;
  row-gap: 4px;
  align-items: end;
  margin-bottom: 48px;
  position: relative;
}

.page-about .about-sechead__index {
  grid-row: 1 / 4;
  align-self: start;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px var(--gold-line);
  line-height: 1;
  padding-top: 4px;
}

.page-about .about-sechead__eyebrow {
  margin: 0;
  color: var(--gray);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.page-about .about-sechead__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(28px, 3.6vw, 44px);
  font-weight: 900;
  line-height: 1.2;
  color: var(--cream);
}

.page-about .about-sechead__note {
  grid-column: 2;
  margin: 4px 0 0;
  color: var(--gray);
  font-size: 14px;
}

/* ===== 01 品牌理念 ===== */
.page-about .about-origin {
  padding-block: var(--page-section-pad) clamp(64px, 9vw, 120px);
  border-bottom: 1px solid rgba(168, 162, 158, 0.18);
}

.page-about .about-origin__body {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.page-about .about-origin__lead {
  max-width: 820px;
  font-family: var(--font-head);
  font-size: clamp(20px, 2.6vw, 30px);
  font-weight: 900;
  line-height: 1.5;
  color: var(--cream);
  border-left: 4px solid var(--red);
  padding-left: 20px;
  margin: 0;
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  max-width: 900px;
}

.page-about .about-origin__grid p {
  margin: 0;
  color: #d8d3c8;
  font-size: 15px;
  line-height: 1.9;
}

.page-about .about-origin__motto {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(26px, 4vw, 48px);
  font-weight: 900;
  line-height: 1.3;
  color: var(--gold);
  text-align: right;
  padding-right: 6px;
  border-bottom: 2px solid rgba(196, 139, 47, 0.3);
  padding-bottom: 28px;
}

/* ===== 02 发展历程 ===== */
.page-about .about-timeline {
  padding-block: var(--page-section-pad) clamp(72px, 10vw, 140px);
  background: linear-gradient(180deg, transparent 0%, rgba(29, 39, 53, 0.72) 18%, rgba(29, 39, 53, 0.72) 82%, transparent 100%);
  border-bottom: 1px solid rgba(196, 139, 47, 0.22);
}

.page-about .about-tl {
  position: relative;
}

.page-about .about-tl__item {
  display: grid;
  grid-template-columns: 62px 26px 1fr;
  gap: 14px;
  padding-block: 22px;
  position: relative;
}

.page-about .about-tl__rail {
  position: relative;
  display: flex;
  justify-content: center;
}

.page-about .about-tl__rail::before {
  content: "";
  position: absolute;
  top: -26px;
  bottom: -26px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  background: linear-gradient(180deg, transparent 0%, var(--red) 20%, var(--gold-line) 78%, transparent 100%);
}

.page-about .about-tl__item:first-child .about-tl__rail::before {
  top: 34px;
  bottom: -26px;
}

.page-about .about-tl__item:last-child .about-tl__rail::before {
  top: -26px;
  bottom: 34px;
}

.page-about .about-tl__dot {
  position: relative;
  z-index: 1;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 0 4px rgba(214, 43, 43, 0.18), 0 0 22px rgba(214, 43, 43, 0.5);
  display: inline-block;
  margin-top: 10px;
}

.page-about .about-tl__year {
  position: relative;
  font-family: var(--font-mono);
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px rgba(196, 139, 47, 0.85);
  line-height: 1;
  padding-top: 4px;
  outline: none;
  cursor: default;
}

.page-about .about-tl__year:hover,
.page-about .about-tl__year:focus-visible {
  -webkit-text-stroke: 1.6px var(--gold);
}

.page-about .about-tl__year:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}

.page-about .about-tl__tip {
  position: absolute;
  left: 0;
  top: calc(100% + 6px);
  background: var(--red);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 400;
  white-space: nowrap;
  padding: 4px 8px;
  border-radius: 2px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity 0.25s var(--page-ease), transform 0.25s var(--page-ease), visibility 0.25s;
  z-index: 3;
}

.page-about .about-tl__year:hover .about-tl__tip,
.page-about .about-tl__year:focus-visible .about-tl__tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-about .about-tl__card {
  background: rgba(16, 20, 31, 0.78);
  border: 1px solid rgba(232, 163, 61, 0.18);
  border-left: 3px solid var(--red);
  padding: 18px 20px;
  transition: border-color 0.3s var(--page-ease), background 0.3s var(--page-ease);
}

.page-about .about-tl__card:hover {
  border-color: rgba(232, 163, 61, 0.55);
  background: rgba(29, 39, 53, 0.86);
}

.page-about .about-tl__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 900;
  color: var(--cream);
}

.page-about .about-tl__text {
  margin: 0;
  color: #c9c2b6;
  font-size: 14px;
  line-height: 1.75;
}

/* ===== 03 内容与数据能力 ===== */
.page-about .about-cap {
  padding-block: var(--page-section-pad) clamp(72px, 10vw, 140px);
  border-bottom: 1px solid rgba(168, 162, 158, 0.18);
}

.page-about .about-cap__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

.page-about .about-cap__narrative {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-cap__p {
  margin: 0;
  color: #d8d3c8;
  font-size: 15px;
  line-height: 1.9;
}

.page-about .about-cap__figure {
  margin: 24px 0 0;
  border: 1px solid rgba(196, 139, 47, 0.35);
  background: var(--bg-panel);
}

.page-about .about-cap__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.page-about .about-cap__figcaption {
  display: block;
  padding: 10px 16px;
  font-size: 12px;
  color: var(--gray);
  border-top: 1px solid rgba(196, 139, 47, 0.25);
}

.page-about .about-cap__wall {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.page-about .about-cap__stat {
  background: var(--bg-panel);
  border-top: 3px solid var(--gold-line);
  border-left: 1px solid rgba(196, 139, 47, 0.3);
  border-right: 1px solid rgba(196, 139, 47, 0.3);
  border-bottom: 1px solid rgba(196, 139, 47, 0.3);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform 0.3s var(--page-ease), box-shadow 0.3s var(--page-ease);
}

.page-about .about-cap__stat:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(232, 163, 61, 0.2);
}

.page-about .about-cap__num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 4.2vw, 52px);
  font-weight: 700;
  color: var(--gold);
  line-height: 1;
}

.page-about .about-cap__label {
  color: var(--gray);
  font-size: 13px;
  line-height: 1.5;
}

/* ===== 04 资质与荣誉 ===== */
.page-about .about-honor {
  padding-block: var(--page-section-pad) clamp(72px, 10vw, 140px);
  background: radial-gradient(circle at 90% 10%, rgba(232, 163, 61, 0.1) 0%, transparent 42%);
  border-bottom: 1px solid rgba(196, 139, 47, 0.22);
}

.page-about .about-honor__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .about-honor__item {
  background: rgba(29, 39, 53, 0.68);
  border: 1px solid rgba(196, 139, 47, 0.42);
  transition: border-color 0.3s var(--page-ease), background 0.3s var(--page-ease);
}

.page-about .about-honor__item[open] {
  background: rgba(29, 39, 53, 0.92);
  border-color: var(--gold-line);
}

.page-about .about-honor__summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 24px;
  transition: background 0.25s var(--page-ease);
}

.page-about .about-honor__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-honor__summary:hover {
  background: rgba(232, 163, 61, 0.08);
}

.page-about .about-honor__tag {
  display: inline-flex;
  align-self: flex-start;
  font-size: 11px;
  letter-spacing: 0.14em;
  font-weight: 700;
  color: var(--gold);
  background: rgba(232, 163, 61, 0.1);
  border: 1px solid rgba(196, 139, 47, 0.3);
  padding: 2px 10px;
}

.page-about .about-honor__name {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 900;
  color: var(--cream);
  line-height: 1.45;
}

.page-about .about-honor__year {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--gray);
  letter-spacing: 0.06em;
}

.page-about .about-honor__expand {
  padding: 0 24px 22px;
  border-top: 1px dashed rgba(196, 139, 47, 0.32);
  margin-top: 2px;
}

.page-about .about-honor__expand p {
  margin: 12px 0 0;
  color: #d8d3c8;
  font-size: 14px;
  line-height: 1.75;
}

/* ===== 05 团队与生态 ===== */
.page-about .about-eco {
  padding-block: var(--page-section-pad) clamp(72px, 10vw, 140px);
  border-bottom: 1px solid rgba(168, 162, 158, 0.18);
}

.page-about .about-eco__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 44px;
}

.page-about .about-eco__content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-eco__p {
  margin: 0;
  color: #d8d3c8;
  font-size: 15px;
  line-height: 1.9;
}

.page-about .about-eco__figure {
  margin: 0;
  border: 1px solid rgba(196, 139, 47, 0.4);
  background: var(--bg-panel);
  position: relative;
}

.page-about .about-eco__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-eco__figcaption {
  display: block;
  padding: 10px 16px;
  font-size: 12px;
  color: var(--gray);
  border-top: 1px solid rgba(196, 139, 47, 0.25);
}

/* ===== 底部陶土色收束 ===== */
.page-about .about-closing {
  background:
    radial-gradient(circle at 12% 80%, rgba(214, 43, 43, 0.26) 0%, transparent 46%),
    linear-gradient(115deg, var(--terra) 0%, #9a4f28 60%, var(--terra) 100%);
  color: var(--cream);
  text-align: center;
  padding-block: clamp(80px, 12vw, 160px);
}

.page-about .about-closing__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 26px;
}

.page-about .about-closing__label {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: rgba(245, 239, 227, 0.8);
}

.page-about .about-closing__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(30px, 5vw, 54px);
  font-weight: 900;
  line-height: 1.25;
  max-width: 760px;
}

.page-about .about-closing__text {
  margin: 0;
  max-width: 640px;
  color: rgba(245, 239, 227, 0.88);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-closing__actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  margin-top: 16px;
}

.page-about .about-closing__actions .btn {
  width: 100%;
  justify-content: center;
}

.page-about .about-closing__actions .btn-outline {
  border-color: var(--gold);
  color: var(--cream);
}

.page-about .about-closing__actions .btn-outline:hover {
  background: rgba(245, 239, 227, 0.1);
}

/* ===== 桌面端增强 ===== */
@media (min-width: 720px) {
  .page-about .about-hero__actions {
    flex-direction: row;
  }

  .page-about .about-hero__actions .btn {
    width: auto;
  }

  .page-about .about-closing__actions {
    flex-direction: row;
    justify-content: center;
  }

  .page-about .about-closing__actions .btn {
    width: auto;
  }

  .page-about .about-honor__grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-origin__grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-tl__item {
    grid-template-columns: 108px 42px 1fr;
    gap: 18px;
  }

  .page-about .about-tl__year {
    font-size: 52px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: stretch;
    min-height: 620px;
    padding: 0;
  }

  .page-about .about-hero__copy {
    padding-block: 88px;
    padding-inline: clamp(40px, 5vw, 76px) 32px;
  }

  .page-about .about-hero__visual {
    margin: 0;
    border: 0;
    border-left: 1px solid rgba(196, 139, 47, 0.4);
    min-height: 620px;
    padding-bottom: 0;
  }

  .page-about .about-hero__visual img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    aspect-ratio: auto;
    object-fit: cover;
  }

  .page-about .about-hero__caption {
    border-top: 1px solid rgba(196, 139, 47, 0.28);
  }

  .page-about .about-cap__layout {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
    gap: 64px;
  }

  .page-about .about-cap__wall {
    grid-template-columns: 1fr;
    position: sticky;
    top: 32px;
  }

  .page-about .about-cap__stat {
    padding: 30px 28px;
  }

  .page-about .about-cap__num {
    font-size: 58px;
  }

  .page-about .about-eco__layout {
    grid-template-columns: 1fr 0.85fr;
    align-items: center;
    gap: 64px;
  }

  .page-about .about-sechead__index {
    font-size: 48px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-tl__item {
    grid-template-columns: 180px 56px 1fr;
    gap: 24px;
    padding-block: 30px;
  }

  .page-about .about-tl__year {
    font-size: 64px;
  }

  .page-about .about-tl__card {
    padding: 24px 28px;
  }
}