.page-about {
  --about-section-y: clamp(64px, 9vw, 120px);
  --about-arc: 40px;
  background: var(--qf-snow);
  color: var(--qf-ink);
  overflow-x: clip;
}

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

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(24px, 4vw, 44px);
  font-size: 13px;
  line-height: 1.6;
}

.page-about .about-crumb .qf-breadcrumb__link {
  color: rgba(251, 253, 254, 0.72);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-crumb .qf-breadcrumb__link:hover {
  color: var(--qf-prayer);
  border-bottom-color: var(--qf-prayer);
}

.page-about .about-crumb .qf-breadcrumb__sep {
  color: rgba(251, 253, 254, 0.4);
}

.page-about .about-crumb .qf-breadcrumb__current {
  color: var(--qf-snow);
  font-weight: 600;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(104px, 15vw, 170px) 0 clamp(56px, 8vw, 100px);
  border-radius: 0 0 var(--about-arc) var(--about-arc);
  background:
    radial-gradient(110% 90% at 88% 2%, rgba(111, 195, 216, 0.4), rgba(111, 195, 216, 0) 58%),
    linear-gradient(158deg, #0A4E63 0%, #0E7C9B 68%, #0D7B99 100%);
  color: var(--qf-snow);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: linear-gradient(
    90deg,
    var(--qf-sunset) 0 22%,
    var(--qf-prayer) 22% 48%,
    var(--qf-lake-light) 48% 74%,
    rgba(251, 253, 254, 0.5) 74% 100%
  );
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(34px, 5vw, 60px);
}

.page-about .about-hero .qf-eyebrow {
  display: block;
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--qf-prayer);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  color: var(--qf-snow);
  max-width: 18ch;
}

.page-about .about-hero .qf-lede {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: rgba(251, 253, 254, 0.84);
}

.page-about .about-hero .qf-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.page-about .about-btn-ghost {
  display: inline-flex;
  align-items: center;
  padding: 12px 24px;
  border-radius: var(--qf-radius-pill);
  border: 1.5px solid rgba(251, 253, 254, 0.45);
  color: var(--qf-snow);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.22s ease, background 0.22s ease, color 0.22s ease;
}

.page-about .about-btn-ghost:hover {
  border-color: var(--qf-prayer);
  background: rgba(242, 178, 51, 0.14);
  color: var(--qf-prayer);
}

/* 首屏漂浮卡片 */
.page-about .about-hero__stack {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 4px var(--qf-gutter) 14px;
  margin-inline: calc(var(--qf-gutter) * -1);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-float {
  flex: 0 0 76%;
  scroll-snap-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 24px;
  border-radius: var(--qf-radius-md);
  background: rgba(251, 253, 254, 0.96);
  color: var(--qf-ink);
  box-shadow: var(--qf-shadow-1);
  transition: transform 0.24s ease, box-shadow 0.24s ease;
}

.page-about .about-float:hover {
  transform: translateY(-6px);
  box-shadow: var(--qf-shadow-2);
}

.page-about .about-float__num {
  font-size: clamp(34px, 5vw, 52px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--qf-lake-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .about-float__label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--qf-stone);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: var(--about-section-y) 0;
}

.page-about .about-section--mist {
  background: var(--qf-mist);
  border-radius: var(--about-arc);
}

.page-about .about-section--soft {
  background: linear-gradient(180deg, var(--qf-snow) 0%, var(--qf-mist) 100%);
  border-radius: var(--about-arc);
}

.page-about .about-head {
  display: grid;
  gap: 16px;
  margin-bottom: clamp(32px, 5vw, 60px);
}

.page-about .about-head__left {
  min-width: 0;
}

.page-about .qf-number {
  display: block;
  font-size: clamp(44px, 7vw, 88px);
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1.6px var(--qf-lake-light);
  font-variant-numeric: tabular-nums;
}

.page-about .qf-h2 {
  margin: 12px 0 0;
  color: var(--qf-lake-deep);
  max-width: 22ch;
}

.page-about .qf-h3 {
  margin: 0;
  color: var(--qf-lake-deep);
  font-size: clamp(18px, 1.9vw, 22px);
}

.page-about .about-head__aside {
  margin: 0;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.7;
  color: var(--qf-stone);
}

.page-about .about-prose p {
  margin: 0 0 1.2em;
  max-width: 62ch;
  font-size: clamp(16px, 1.5vw, 17px);
  line-height: 1.85;
  color: #37424A;
}

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

/* ---------- 02 方法 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.2vw, 22px);
}

.page-about .about-principle {
  display: grid;
  gap: 10px;
  padding: clamp(22px, 2.8vw, 30px);
  border-radius: var(--qf-radius-md);
  background: var(--qf-snow);
  box-shadow: var(--qf-shadow-1);
  transition: transform 0.24s ease, box-shadow 0.24s ease;
}

.page-about .about-principle:hover {
  transform: translateY(-6px);
  box-shadow: var(--qf-shadow-2);
}

.page-about .about-principle__idx {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--qf-sunset);
  font-variant-numeric: tabular-nums;
}

.page-about .about-principle p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--qf-stone);
}

.page-about .about-figure {
  margin: 0;
  border-radius: var(--qf-radius-lg);
  overflow: hidden;
  background: linear-gradient(150deg, var(--qf-mist), #EEF7FA);
}

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

.page-about .about-figure__cap {
  padding: 16px 22px 22px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--qf-stone);
}

/* ---------- 03 时间线通栏 ---------- */
.page-about .about-band {
  position: relative;
  padding: var(--about-section-y) 0;
  border-radius: var(--about-arc);
  background: linear-gradient(152deg, #0A4E63 0%, #0E7C9B 100%);
  color: var(--qf-snow);
}

.page-about .about-head--dark .qf-h2 {
  color: var(--qf-snow);
}

.page-about .about-head--dark .qf-number {
  -webkit-text-stroke-color: rgba(251, 253, 254, 0.5);
}

.page-about .about-head--dark .about-head__aside {
  color: rgba(251, 253, 254, 0.72);
}

.page-about .about-band__figure {
  margin: 0 0 clamp(30px, 4vw, 48px);
  border-radius: var(--qf-radius-lg);
  overflow: hidden;
  background: rgba(251, 253, 254, 0.08);
}

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

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 4px 4px 18px;
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline::-webkit-scrollbar {
  height: 8px;
}

.page-about .about-timeline::-webkit-scrollbar-track {
  background: rgba(251, 253, 254, 0.14);
  border-radius: var(--qf-radius-pill);
}

.page-about .about-timeline::-webkit-scrollbar-thumb {
  background: rgba(251, 253, 254, 0.4);
  border-radius: var(--qf-radius-pill);
}

.page-about .about-node {
  flex: 0 0 78%;
  scroll-snap-align: start;
  padding: clamp(20px, 2.6vw, 28px);
  border-radius: var(--qf-radius-md);
  background: rgba(251, 253, 254, 0.1);
  border: 1px solid rgba(251, 253, 254, 0.2);
  transition: transform 0.24s ease, background 0.24s ease, border-color 0.24s ease;
}

.page-about .about-node:hover,
.page-about .about-node:focus-within {
  transform: translateY(-6px);
  background: rgba(251, 253, 254, 0.18);
  border-color: var(--qf-prayer);
}

.page-about .about-node__stage {
  display: inline-block;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--qf-prayer);
}

.page-about .about-node__title {
  margin: 10px 0 8px;
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--qf-snow);
}

.page-about .about-node__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(251, 253, 254, 0.78);
}

/* ---------- 04 团队分工 ---------- */
.page-about .about-roles {
  display: grid;
  gap: clamp(18px, 2.4vw, 24px);
}

.page-about .about-role {
  display: grid;
  gap: 10px;
  padding: clamp(22px, 2.8vw, 32px);
  border-radius: var(--qf-radius-md);
  background: var(--qf-snow);
  box-shadow: var(--qf-shadow-1);
  transition: transform 0.24s ease, box-shadow 0.24s ease;
}

.page-about .about-role:hover {
  transform: translateY(-6px);
  box-shadow: var(--qf-shadow-2);
}

.page-about .about-role--warm {
  background: var(--qf-prayer-soft);
}

.page-about .about-role__num {
  font-size: clamp(38px, 5vw, 56px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--qf-lake);
  font-variant-numeric: tabular-nums;
}

.page-about .about-role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--qf-stone);
}

/* ---------- 05 更新节奏 ---------- */
.page-about .about-rhythm {
  display: grid;
  gap: clamp(32px, 4vw, 56px);
}

.page-about .about-ring {
  position: relative;
  width: min(100%, 340px);
  aspect-ratio: 1 / 1;
  margin-inline: auto;
  border-radius: 50%;
  background: conic-gradient(
    var(--qf-lake) 0 46%,
    var(--qf-sunset) 46% 74%,
    var(--qf-prayer) 74% 100%
  );
  display: grid;
  place-items: center;
}

.page-about .about-ring::before {
  content: "";
  position: absolute;
  inset: 22%;
  border-radius: 50%;
  background: var(--qf-mist);
}

.page-about .about-ring__core {
  position: relative;
  z-index: 1;
  display: grid;
  justify-items: center;
  gap: 2px;
  text-align: center;
}

.page-about .about-ring__num {
  font-size: clamp(40px, 6vw, 60px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--qf-lake-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .about-ring__cap {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--qf-stone);
}

.page-about .about-beats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  min-width: 0;
}

.page-about .about-beat {
  display: grid;
  gap: 6px;
  padding: clamp(18px, 2.2vw, 26px);
  border-radius: var(--qf-radius-sm);
  background: var(--qf-snow);
  border-left: 4px solid var(--qf-lake);
  transition: transform 0.24s ease, background 0.24s ease;
}

.page-about .about-beat:nth-child(2) {
  border-left-color: var(--qf-sunset);
}

.page-about .about-beat:nth-child(3) {
  border-left-color: var(--qf-prayer);
}

.page-about .about-beat:hover {
  transform: translateX(6px);
  background: var(--qf-prayer-soft);
}

.page-about .about-beat__title {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--qf-lake-deep);
}

.page-about .about-beat__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--qf-stone);
}

/* ---------- 06 合作 ---------- */
.page-about .about-partner {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-contact {
  align-self: start;
  display: grid;
  gap: 12px;
  padding: clamp(24px, 3vw, 34px);
  border-radius: var(--qf-radius-md);
  background: var(--qf-mist);
}

.page-about .about-contact__label {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--qf-stone);
}

.page-about .about-copy {
  justify-self: start;
  padding: 12px 22px;
  border: 1.5px solid var(--qf-lake);
  border-radius: var(--qf-radius-pill);
  background: var(--qf-snow);
  color: var(--qf-lake-deep);
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  word-break: break-all;
  cursor: pointer;
  transition: background 0.22s ease, color 0.22s ease, border-color 0.22s ease;
}

.page-about .about-copy:hover {
  background: var(--qf-lake);
  color: var(--qf-snow);
}

.page-about .about-copy[data-copied="true"] {
  background: var(--qf-prayer-soft);
  border-color: var(--qf-prayer);
  color: var(--qf-ink);
}

.page-about .about-contact__line {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--qf-lake-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .about-contact__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--qf-stone);
}

.page-about .about-contact__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 0;
}

.page-about .about-contact .qf-tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: var(--qf-radius-pill);
  font-size: 13px;
  font-weight: 600;
  background: var(--qf-snow);
  color: var(--qf-lake-deep);
  border: 1px solid var(--qf-line);
}

.page-about .about-contact .qf-tag--sunset {
  background: var(--qf-prayer-soft);
  border-color: var(--qf-prayer);
  color: #8A5A05;
}

/* ---------- 结尾动作 ---------- */
.page-about .about-cta {
  padding: 0 0 clamp(64px, 9vw, 112px);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
  padding: clamp(34px, 4.6vw, 60px);
  border-radius: var(--about-arc);
  background: linear-gradient(140deg, var(--qf-prayer-soft) 0%, #FFF7E6 62%, #FDF1D9 100%);
}

.page-about .about-cta .qf-h2 {
  margin: 0;
  color: var(--qf-lake-deep);
}

.page-about .about-cta p {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: #4A5459;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-about .about-btn-ghost-dark {
  display: inline-flex;
  align-items: center;
  padding: 12px 24px;
  border-radius: var(--qf-radius-pill);
  border: 1.5px solid rgba(10, 78, 99, 0.32);
  color: var(--qf-lake-deep);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.22s ease, background 0.22s ease, color 0.22s ease;
}

.page-about .about-btn-ghost-dark:hover {
  border-color: var(--qf-lake);
  background: rgba(14, 124, 155, 0.1);
}

/* ---------- 焦点可见 ---------- */
.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--qf-sunset);
  outline-offset: 3px;
  border-radius: var(--qf-radius-pill);
}

/* ---------- 等高线动画 ---------- */
.page-about .about-contour {
  color: var(--qf-lake-light);
}

.page-about .about-contour path {
  opacity: 0.4;
  stroke-width: 2.4;
}

.page-about [data-reveal].is-visible .about-contour path {
  animation: aboutContour 0.5s ease forwards;
}

.page-about [data-reveal].is-visible .about-contour path:nth-child(1) { animation-delay: 0.04s; }
.page-about [data-reveal].is-visible .about-contour path:nth-child(2) { animation-delay: 0.12s; }
.page-about [data-reveal].is-visible .about-contour path:nth-child(3) { animation-delay: 0.2s; }
.page-about [data-reveal].is-visible .about-contour path:nth-child(4) { animation-delay: 0.28s; }
.page-about [data-reveal].is-visible .about-contour path:nth-child(5) { animation-delay: 0.36s; }

@keyframes aboutContour {
  from { opacity: 0.4; stroke-width: 2.4; }
  to   { opacity: 1; stroke-width: 3.2; }
}

/* ---------- 断点 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero__stack {
    margin-inline: 0;
    padding-inline: 0;
  }

  .page-about .about-float {
    flex: 0 0 auto;
  }

  .page-about .about-node {
    flex: 0 0 calc(33.333% - 11px);
  }

  .page-about .about-head {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-head__aside {
    text-align: right;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 11fr) minmax(0, 9fr);
    align-items: center;
    gap: clamp(32px, 4vw, 68px);
  }

  .page-about .about-hero__stack {
    display: block;
    position: relative;
    min-height: 400px;
    overflow: visible;
  }

  .page-about .about-hero__stack .about-float {
    position: absolute;
  }

  .page-about .about-float--a {
    width: 64%;
    top: 0;
    left: 0;
  }

  .page-about .about-float--b {
    width: 68%;
    top: 33%;
    right: 0;
  }

  .page-about .about-float--c {
    width: 60%;
    top: 67%;
    left: 6%;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-figure {
    position: sticky;
    top: 108px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .about-role:nth-child(1) {
    grid-column: 1 / span 6;
  }

  .page-about .about-role:nth-child(2) {
    grid-column: 7 / span 6;
    margin-top: 48px;
  }

  .page-about .about-role:nth-child(3) {
    grid-column: 3 / span 8;
    margin-top: 8px;
  }

  .page-about .about-rhythm {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }

  .page-about .about-ring {
    margin-inline: 0;
  }

  .page-about .about-partner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-node {
    flex: 0 0 calc(25% - 12px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-float,
  .page-about .about-principle,
  .page-about .about-role,
  .page-about .about-node,
  .page-about .about-beat {
    transition: opacity 0.2s ease;
  }

  .page-about .about-float:hover,
  .page-about .about-principle:hover,
  .page-about .about-role:hover,
  .page-about .about-node:hover,
  .page-about .about-beat:hover {
    transform: none;
  }

  .page-about [data-reveal].is-visible .about-contour path {
    animation: none;
    opacity: 1;
  }
}