.page-about {
  --about-rule: 2px solid var(--k1-stand);
  --about-soft: rgba(245, 242, 234, 0.82);
  --about-dim: rgba(245, 242, 234, 0.6);
  background:
    radial-gradient(1100px 400px at 84% -8%, rgba(230, 51, 41, 0.18), transparent 64%),
    var(--k1-black);
  color: var(--k1-chalk);
  font-family: var(--k1-font-body);
  overflow-x: clip;
  padding-top: calc(var(--k1-header-h) + 20px);
}

.page-about .k1-container {
  width: 100%;
  max-width: var(--k1-wrap);
  margin-inline: auto;
  padding-inline: var(--k1-gutter);
}

/* ---------- 面包屑 ---------- */
.page-about .k1-breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 32px);
  padding: 0;
  font-family: var(--k1-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--k1-mist);
}
.page-about .k1-breadcrumb-list > li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-about .k1-breadcrumb-list > li:not(:last-child)::after {
  content: "/";
  color: var(--k1-stand);
}
.page-about .k1-breadcrumb-link {
  color: var(--k1-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}
.page-about .k1-breadcrumb-link:hover,
.page-about .k1-breadcrumb-link:focus-visible {
  color: var(--k1-lime);
  border-bottom-color: var(--k1-lime);
}
.page-about .k1-breadcrumb-list > li[aria-current="page"] {
  color: var(--k1-chalk);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(46px, 7vw, 88px);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(34px, 5vw, 54px);
}

.page-about .about-hero-main {
  position: relative;
  padding-top: clamp(16px, 5vw, 42px);
  min-width: 0;
}

.page-about .about-hero-index {
  position: absolute;
  top: -0.34em;
  left: -0.04em;
  z-index: 0;
  font-family: var(--k1-font-mono);
  font-size: clamp(5rem, 23vw, 12rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.07em;
  color: transparent;
  -webkit-text-stroke: 2px rgba(230, 51, 41, 0.5);
  pointer-events: none;
  user-select: none;
}

.page-about .about-hero-eyebrow {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
}
.page-about .about-hero-eyebrow-text {
  font-family: var(--k1-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--k1-mist);
}

.page-about .about-hero-title {
  position: relative;
  z-index: 1;
  margin: 14px 0 0;
  font-family: var(--k1-font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 7.2vw, 4.3rem);
  line-height: 0.96;
  letter-spacing: -0.045em;
  color: var(--k1-chalk);
}

.page-about .about-hero-lead {
  position: relative;
  z-index: 1;
  max-width: 56ch;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(24px, 4vw, 34px);
  padding-top: 20px;
  border-top: var(--about-rule);
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}
.page-about .about-stat-num {
  font-family: var(--k1-font-mono);
  font-size: clamp(1.4rem, 5vw, 2.05rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--k1-lime);
}
.page-about .about-stat-label {
  font-size: 0.75rem;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--k1-mist);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 34px);
}

.page-about .about-hero-rail {
  display: grid;
  gap: 24px;
  min-width: 0;
}

.page-about .about-hero-figure {
  position: relative;
  margin: 0;
  aspect-ratio: 16 / 9;
  border: 3px solid var(--k1-stand);
  border-radius: var(--k1-radius);
  overflow: hidden;
  background: var(--k1-concrete);
  box-shadow: var(--k1-shadow);
  transform: rotate(-1.4deg);
}
.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.06);
}

/* 纵向时间轴 */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 26px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--k1-red), var(--k1-amber) 55%, var(--k1-stand));
}
.page-about .about-tl-item {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}
.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--k1-amber);
  border: 2px solid var(--k1-black);
}
.page-about .about-tl-item:last-child::before {
  background: var(--k1-lime);
}
.page-about .about-tl-year {
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--k1-amber);
}
.page-about .about-tl-item:last-child .about-tl-year {
  color: var(--k1-lime);
}
.page-about .about-tl-text {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--about-soft);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  position: relative;
  padding: clamp(52px, 8vw, 100px) 0;
  border-top: 3px solid var(--k1-stand);
}
.page-about .about-head {
  max-width: 760px;
  margin: 0 0 clamp(26px, 4vw, 44px);
}
.page-about .about-head h2 {
  margin: 12px 0 0;
  font-family: var(--k1-font-display);
  font-weight: 900;
  font-size: clamp(1.75rem, 4.4vw, 2.9rem);
  line-height: 1.06;
  letter-spacing: -0.035em;
  color: var(--k1-chalk);
}
.page-about .about-head-lead {
  margin: 14px 0 0;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--about-soft);
}

/* ---------- 四条内容线 ---------- */
.page-about .about-lines {
  background: var(--k1-concrete);
  border-top: 3px solid var(--k1-stand);
}
.page-about .about-lines-grid {
  display: grid;
  gap: 16px;
}
.page-about .about-line {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  background: var(--k1-black);
  border: var(--about-rule);
  border-radius: var(--k1-radius);
  overflow: hidden;
}
.page-about .about-line::after {
  content: "";
  position: absolute;
  right: -34px;
  bottom: -34px;
  width: 96px;
  height: 96px;
  background: var(--k1-red);
  opacity: 0.14;
  transform: rotate(16deg);
  pointer-events: none;
}
.page-about .about-line-no {
  display: block;
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  color: var(--k1-red);
}
.page-about .about-line h3 {
  margin: 10px 0 0;
  font-family: var(--k1-font-display);
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--k1-chalk);
}
.page-about .about-line p {
  position: relative;
  z-index: 1;
  margin: 12px 0 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--about-soft);
}
.page-about .about-line-meta {
  margin-top: 18px !important;
  padding-top: 14px;
  border-top: 1px dashed var(--k1-stand);
  font-size: 0.73rem !important;
  letter-spacing: 0.05em;
  color: var(--k1-lime) !important;
}

.page-about .about-figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
  border: 3px solid var(--k1-stand);
  border-radius: var(--k1-radius);
  overflow: hidden;
  background: var(--k1-black);
  box-shadow: var(--k1-shadow);
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure figcaption {
  padding: 14px 18px;
  border-top: var(--about-rule);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--k1-mist);
  background: var(--k1-concrete);
}

/* ---------- 角色标签页 ---------- */
.page-about .about-tabs {
  position: relative;
}
.page-about .about-tablist {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}
.page-about .about-tablist .k1-tab {
  flex: 0 0 auto;
  padding: 12px 20px;
  font-family: var(--k1-font-body);
  font-size: 0.92rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--k1-chalk);
  background: var(--k1-concrete);
  border: var(--about-rule);
  border-radius: var(--k1-radius-pill);
  cursor: pointer;
  transition: transform 0.16s var(--k1-ease), background 0.16s var(--k1-ease),
    border-color 0.16s var(--k1-ease);
}
.page-about .about-tablist .k1-tab:hover {
  transform: translateY(-2px);
  border-color: var(--k1-red);
}
.page-about .about-tablist .k1-tab:focus-visible {
  outline: 3px solid var(--k1-lime);
  outline-offset: 3px;
}
.page-about .about-tablist .k1-tab[aria-selected="true"] {
  background: var(--k1-red);
  border-color: var(--k1-red);
  color: var(--k1-chalk);
}

.page-about .about-tabpanel {
  margin-top: 22px;
  padding: clamp(20px, 4vw, 38px);
  background: var(--k1-concrete);
  border: 3px solid var(--k1-stand);
  border-radius: var(--k1-radius);
  box-shadow: var(--k1-shadow);
}
.page-about .about-tabpanel + .about-tabpanel {
  margin-top: 18px;
}
.page-about .about-panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}
.page-about .about-panel-title {
  margin: 0;
  font-family: var(--k1-font-display);
  font-size: clamp(1.2rem, 3.2vw, 1.6rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--k1-chalk);
}
.page-about .about-tabpanel > p {
  max-width: 68ch;
  margin: 14px 0 0;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--about-soft);
}
.page-about .about-panel-list {
  display: grid;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-panel-list li {
  position: relative;
  padding-left: 22px;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--about-soft);
}
.page-about .about-panel-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 9px;
  height: 9px;
  background: var(--k1-red);
  transform: rotate(45deg);
}
.page-about .about-panel-foot {
  margin: 22px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--k1-stand);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--k1-amber);
}

/* ---------- 合作网络 ---------- */
.page-about .about-network {
  background: var(--k1-concrete);
}
.page-about .about-network-grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: center;
}
.page-about .about-network-copy h2 {
  margin: 12px 0 0;
  font-family: var(--k1-font-display);
  font-weight: 900;
  font-size: clamp(1.75rem, 4.4vw, 2.9rem);
  line-height: 1.06;
  letter-spacing: -0.035em;
  color: var(--k1-chalk);
}
.page-about .about-network-copy > p {
  margin: 16px 0 0;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--about-soft);
}
.page-about .about-network-list {
  display: grid;
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-network-list li {
  padding: 12px 16px;
  background: var(--k1-black);
  border: var(--about-rule);
  border-left: 4px solid var(--k1-green);
  border-radius: 8px;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--about-soft);
}
.page-about .about-network-grid .about-figure {
  margin-top: 0;
}

.page-about .about-network-coords {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(28px, 4vw, 44px);
}
.page-about .about-coord {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  background: var(--k1-black);
  border: var(--about-rule);
  border-left: 4px solid var(--k1-green);
  border-radius: 8px;
  transition: transform 0.18s var(--k1-ease), border-left-color 0.18s var(--k1-ease),
    box-shadow 0.18s var(--k1-ease);
}
.page-about .about-coord:hover {
  transform: translateY(-4px);
  border-left-color: var(--k1-lime);
  box-shadow: var(--k1-shadow-lift);
}
.page-about .about-coord-no {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--k1-mist);
}
.page-about .about-coord-num {
  font-family: var(--k1-font-mono);
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--k1-lime);
}
.page-about .about-coord-label {
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--about-dim);
}

/* ---------- 发展与认可 ---------- */
.page-about .about-recog-grid {
  display: grid;
  gap: 16px;
}
.page-about .about-recog-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
  height: 100%;
  background: var(--k1-concrete);
  border: var(--about-rule);
  border-radius: var(--k1-radius);
  padding: clamp(18px, 3vw, 26px);
}
.page-about .about-recog-card .k1-sheet-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.page-about .about-recog-card h3 {
  margin: 0;
  font-family: var(--k1-font-display);
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: -0.015em;
  color: var(--k1-chalk);
}
.page-about .about-recog-card .k1-sheet-body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--about-soft);
}
.page-about .about-recog-card .k1-sheet-foot {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed var(--k1-stand);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--k1-mist);
}

/* ---------- 联系 ---------- */
.page-about .about-contact {
  border-top: 3px solid var(--k1-stand);
}
.page-about .about-contact-panel {
  padding: clamp(26px, 5vw, 54px);
  background:
    linear-gradient(135deg, rgba(230, 51, 41, 0.18), transparent 58%),
    var(--k1-concrete);
  border: 3px solid var(--k1-red);
  border-radius: var(--k1-radius);
  box-shadow: var(--k1-shadow-lift);
}
.page-about .about-contact-panel h2 {
  margin: 0;
  max-width: 22ch;
  font-family: var(--k1-font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 4.2vw, 2.6rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
  color: var(--k1-chalk);
}
.page-about .about-contact-panel p {
  max-width: 66ch;
  margin: 16px 0 0;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--about-soft);
}
.page-about .about-contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 4vw, 32px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-lines-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-network-coords {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-recog-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
  .page-about .about-hero-rail {
    padding-top: 14px;
  }
  .page-about .about-network-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  }
  .page-about .about-line:nth-child(2) {
    transform: translateY(22px);
  }
  .page-about .about-line:nth-child(4) {
    transform: translateY(22px);
  }
  .page-about .about-lines .about-figure {
    margin-top: clamp(48px, 5vw, 68px);
  }
}

@media (min-width: 1180px) {
  .page-about .about-recog-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 420px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-network-coords {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero-figure,
  .page-about .about-line {
    transform: none;
  }
  .page-about .about-tablist .k1-tab,
  .page-about .about-coord {
    transition: none;
  }
}