.page-about {
  background: var(--k5-black);
  color: var(--k5-text);
  overflow-x: clip;
}

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

.page-about .k5-btn {
  text-decoration: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin-top: calc(var(--k5-header-h) * -1);
  padding: calc(var(--k5-header-h) + 20px) 0 clamp(48px, 8vw, 96px);
}

.page-about .about-hero__glow {
  position: absolute;
  top: -12%;
  left: -18%;
  right: -18%;
  height: 560px;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(46% 60% at 16% 24%, rgba(139, 92, 246, 0.44), transparent 68%),
    radial-gradient(40% 56% at 84% 6%, rgba(34, 211, 238, 0.26), transparent 70%);
}

.page-about .about-hero .k5-breadcrumb {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 56px);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--k5-font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.035em;
  color: var(--k5-white);
  max-width: 16ch;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.78;
  color: var(--k5-text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__visual {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--k5-line);
  border-radius: clamp(72px, 16vw, 200px) var(--k5-r-lg) clamp(64px, 14vw, 170px) var(--k5-r-lg);
  background: var(--k5-panel);
  box-shadow: 0 44px 96px -54px rgba(139, 92, 246, 0.9);
}

.page-about .about-hero__visual img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(6, 7, 11, 0) 45%, rgba(6, 7, 11, 0.72));
}

.page-about .about-hero__chip {
  position: absolute;
  left: 14px;
  bottom: 14px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid rgba(34, 211, 238, 0.45);
  background: rgba(6, 7, 11, 0.78);
  color: var(--k5-cyan);
  font-family: var(--k5-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ---------- 通用版块 ---------- */
.page-about .about-section {
  position: relative;
  padding: clamp(44px, 7vw, 92px) 0;
}

.page-about .about-section__head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-h2 {
  margin: 0 0 14px;
  font-family: var(--k5-font-serif);
  font-weight: 600;
  font-size: clamp(25px, 3.8vw, 40px);
  line-height: 1.24;
  letter-spacing: 0.01em;
  color: var(--k5-white);
}

.page-about .about-lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--k5-text);
}

.page-about .about-inline {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-inline .k5-link + .k5-link {
  margin-left: 4px;
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
}

.page-about .about-origin__year {
  display: block;
  margin: 10px 0 8px;
  font-family: var(--k5-font-mono);
  font-size: clamp(64px, 15vw, 132px);
  line-height: 0.84;
  letter-spacing: -0.05em;
  background: linear-gradient(118deg, var(--k5-cyan), var(--k5-violet) 72%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-origin__note {
  margin: 0;
  font-family: var(--k5-font-serif);
  font-size: 15px;
  line-height: 1.6;
  color: var(--k5-text);
  opacity: 0.85;
}

.page-about .about-origin__body p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-caps {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-cap {
  padding: 16px 18px;
  border-left: 2px solid var(--k5-violet);
  border-radius: 0 var(--k5-r) var(--k5-r) 0;
  background: var(--k5-panel);
  transition: border-color 0.22s var(--k5-ease), background 0.22s var(--k5-ease);
}

.page-about .about-cap:hover,
.page-about .about-cap:focus-within {
  border-left-color: var(--k5-cyan);
  background: #141826;
}

.page-about .about-cap__num {
  display: block;
  font-family: var(--k5-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--k5-cyan);
}

.page-about .about-cap__name {
  margin: 6px 0 6px;
  font-family: var(--k5-font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--k5-white);
}

.page-about .about-cap__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--k5-text);
}

/* ---------- 时间线 ---------- */
.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .about-jump__link {
  display: inline-block;
  padding: 8px 15px;
  border: 1px solid var(--k5-line);
  border-radius: 999px;
  color: var(--k5-text);
  font-family: var(--k5-font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: border-color 0.2s var(--k5-ease), color 0.2s var(--k5-ease), background 0.2s var(--k5-ease);
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  border-color: var(--k5-cyan);
  color: var(--k5-cyan);
  background: rgba(34, 211, 238, 0.08);
  outline: none;
}

.page-about .about-timeline {
  position: relative;
  padding-left: 34px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--k5-violet), var(--k5-cyan) 58%, rgba(34, 211, 238, 0));
}

.page-about .about-node {
  position: relative;
  padding-bottom: clamp(28px, 4vw, 46px);
  scroll-margin-top: calc(var(--k5-header-h) + 20px);
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 10px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--k5-black);
  border: 2px solid var(--k5-cyan);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.14);
}

.page-about .about-node__year {
  margin: 0;
  font-family: var(--k5-font-mono);
  font-size: clamp(22px, 3vw, 30px);
  letter-spacing: -0.02em;
  color: var(--k5-cyan);
}

.page-about .about-node__title {
  margin: 6px 0 10px;
  font-family: var(--k5-font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.4vw, 25px);
  line-height: 1.3;
  color: var(--k5-white);
}

.page-about .about-node__text {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--k5-text);
  max-width: 66ch;
}

.page-about .about-node__text:last-child {
  margin-bottom: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-role {
  padding: 20px 20px 22px;
  border: 1px solid var(--k5-line);
  border-radius: var(--k5-r);
  background: linear-gradient(160deg, rgba(139, 92, 246, 0.1), rgba(6, 7, 11, 0) 62%), var(--k5-panel);
  transition: border-color 0.22s var(--k5-ease), box-shadow 0.22s var(--k5-ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  border-color: var(--k5-violet);
  box-shadow: 0 20px 44px -34px rgba(139, 92, 246, 0.95);
}

.page-about .about-role__name {
  margin: 0 0 8px;
  font-family: var(--k5-font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--k5-white);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--k5-text);
}

.page-about .about-team__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3.5vw, 36px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-shot {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--k5-line);
  border-radius: var(--k5-r-lg);
  background: var(--k5-panel);
}

.page-about .about-shot img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-shot::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(198deg, rgba(139, 92, 246, 0.24), rgba(6, 7, 11, 0) 56%, rgba(6, 7, 11, 0.5));
}

.page-about .about-shot--wide img {
  aspect-ratio: 2 / 1;
}

/* ---------- 纯 CSS 视角切换 ---------- */
.page-about .about-tabs {
  position: relative;
  align-self: start;
}

.page-about .about-tabs__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .about-tabs__bar {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 6px;
  border: 1px solid var(--k5-line);
  border-radius: 999px;
  background: var(--k5-panel);
}

.page-about .about-tabs__tab {
  cursor: pointer;
  padding: 9px 16px;
  border-radius: 999px;
  font-family: var(--k5-font-mono);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--k5-text);
  transition: background 0.2s var(--k5-ease), color 0.2s var(--k5-ease);
}

.page-about .about-tabs__tab:hover {
  color: var(--k5-white);
}

.page-about #about-view-edit:checked ~ .about-tabs__bar label[for="about-view-edit"],
.page-about #about-view-data:checked ~ .about-tabs__bar label[for="about-view-data"] {
  background: var(--k5-violet);
  color: var(--k5-white);
}

.page-about .about-tabs__radio:focus-visible ~ .about-tabs__bar {
  outline: 2px solid var(--k5-cyan);
  outline-offset: 3px;
}

.page-about .about-tabs__panel {
  display: none;
  margin-top: 18px;
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--k5-line);
  border-left: 3px solid var(--k5-violet);
  border-radius: var(--k5-r);
  background: var(--k5-panel);
}

.page-about #about-view-edit:checked ~ .about-tabs__panel--edit,
.page-about #about-view-data:checked ~ .about-tabs__panel--data {
  display: block;
}

.page-about .about-tabs__panel-title {
  margin: 0 0 10px;
  font-family: var(--k5-font-serif);
  font-weight: 600;
  font-size: 19px;
  color: var(--k5-white);
}

.page-about .about-tabs__panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--k5-text);
}

/* ---------- 覆盖与合作 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4.5vw, 52px);
  align-items: center;
}

.page-about .about-partners__body p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-partner-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3vw, 30px) 0 0;
  border: 1px solid var(--k5-line);
  border-radius: var(--k5-r);
  background: var(--k5-line);
  overflow: hidden;
}

.page-about .about-partner-stat {
  padding: 18px 16px;
  background: var(--k5-panel);
}

.page-about .about-partner-stat dt {
  font-family: var(--k5-font-mono);
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--k5-cyan);
}

.page-about .about-partner-stat dd {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--k5-text);
}

/* ---------- 内容原则 ---------- */
.page-about .about-principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-principle {
  padding: 20px 20px 22px;
  border-top: 1px solid var(--k5-line);
  background: linear-gradient(180deg, rgba(27, 16, 48, 0.72), rgba(6, 7, 11, 0) 70%);
}

.page-about .about-principle__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--k5-font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--k5-orange);
}

.page-about .about-principle__title {
  margin: 0 0 8px;
  font-family: var(--k5-font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.4;
  color: var(--k5-white);
}

.page-about .about-principle p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--k5-text);
}

/* ---------- 用户与反馈 ---------- */
.page-about .about-community {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4.5vw, 52px);
  align-items: center;
}

.page-about .about-dash {
  padding: clamp(22px, 3.4vw, 32px);
  border: 1px solid var(--k5-line);
  border-radius: var(--k5-r-lg);
  background: radial-gradient(80% 90% at 22% 0%, rgba(34, 211, 238, 0.14), transparent 62%), var(--k5-panel);
  text-align: center;
}

.page-about .about-gauge {
  position: relative;
  width: 132px;
  height: 132px;
  margin: 0 auto;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: conic-gradient(var(--k5-cyan) 0 96%, var(--k5-line) 96% 100%);
}

.page-about .about-gauge::before {
  content: "";
  position: absolute;
  inset: 11px;
  border-radius: 50%;
  background: var(--k5-panel);
}

.page-about .about-gauge__val {
  position: relative;
  z-index: 1;
  font-family: var(--k5-font-mono);
  font-size: 26px;
  letter-spacing: -0.02em;
  color: var(--k5-white);
}

.page-about .about-gauge__label {
  margin: 14px 0 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--k5-text);
}

.page-about .about-dash__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--k5-line);
  border: 1px solid var(--k5-line);
  border-radius: var(--k5-r);
  overflow: hidden;
  text-align: left;
}

.page-about .about-dash__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 16px;
  background: var(--k5-black);
}

.page-about .about-dash__num {
  font-family: var(--k5-font-mono);
  font-size: 19px;
  color: var(--k5-cyan);
}

.page-about .about-dash__key {
  font-size: 13px;
  color: var(--k5-text);
  text-align: right;
}

.page-about .about-community__body p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-community__body .k5-btn {
  margin-top: 8px;
}

/* ---------- 下一步 ---------- */
.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 22px 24px;
  border: 1px solid var(--k5-line);
  border-radius: var(--k5-r);
  background: var(--k5-panel);
  text-decoration: none;
  transition: border-color 0.22s var(--k5-ease), box-shadow 0.22s var(--k5-ease), transform 0.22s var(--k5-ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--k5-cyan);
  box-shadow: 0 24px 48px -34px rgba(34, 211, 238, 0.9);
  outline: none;
}

.page-about .about-next__kicker {
  font-family: var(--k5-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--k5-violet);
}

.page-about .about-next__title {
  font-family: var(--k5-font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.35;
  color: var(--k5-white);
}

.page-about .about-next__text {
  font-size: 14px;
  line-height: 1.72;
  color: var(--k5-text);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-caps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.02fr 0.98fr;
    align-items: center;
  }

  .page-about .about-hero__visual img {
    aspect-ratio: 16 / 11;
  }

  .page-about .about-origin {
    grid-template-columns: 0.62fr 1.38fr;
    align-items: start;
  }

  .page-about .about-origin__aside {
    position: sticky;
    top: calc(var(--k5-header-h) + 24px);
  }

  .page-about .about-timeline {
    padding-left: 120px;
  }

  .page-about .about-timeline::before {
    left: 36px;
  }

  .page-about .about-node {
    max-width: 720px;
  }

  .page-about .about-node::before {
    left: -90px;
  }

  .page-about .about-node:nth-child(even) {
    margin-left: clamp(0px, 7vw, 88px);
  }

  .page-about .about-team__split {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
  }

  .page-about .about-partners {
    grid-template-columns: 1.15fr 0.85fr;
  }

  .page-about .about-principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 28px;
  }

  .page-about .about-community {
    grid-template-columns: 0.85fr 1.15fr;
  }
}

@media (min-width: 1100px) {
  .page-about .about-caps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cap,
  .page-about .about-role,
  .page-about .about-next__card,
  .page-about .about-jump__link,
  .page-about .about-tabs__tab {
    transition: none;
  }
}