.page-about {
  padding-bottom: clamp(40px, 8vw, 96px);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: clamp(8px, 2vw, 18px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 44px) 0 clamp(32px, 5vw, 64px);
  isolation: isolate;
}

.page-about .about-glow {
  position: absolute;
  top: -14%;
  left: -12%;
  width: min(560px, 92vw);
  height: min(560px, 92vw);
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(232, 163, 61, .22), rgba(232, 163, 61, 0) 68%);
  z-index: -1;
  pointer-events: none;
  animation: about-breathe 9s var(--ease) infinite alternate;
}

@keyframes about-breathe {
  from { opacity: .55; transform: scale(.94); }
  to { opacity: 1; transform: scale(1.04); }
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  align-items: start;
}

.page-about .about-hero-copy .display-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.4vw, 3.5rem);
  line-height: 1.22;
  letter-spacing: .01em;
  margin: 10px 0 18px;
  color: var(--paper-100);
}

.page-about .about-hero-copy .lede {
  color: var(--slate-300);
  font-size: clamp(1rem, 2.4vw, 1.08rem);
  line-height: 1.85;
  max-width: 56ch;
}

.page-about .hero-stamps {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 24px;
}

.page-about .hero-stamps .stamp {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--amber-200);
  border: 1px solid rgba(232, 163, 61, .42);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  background: rgba(232, 163, 61, .08);
}

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

.page-about .hero-actions .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* 首屏索引纸卡 */
.page-about .hero-board {
  padding: clamp(18px, 3.4vw, 28px);
  border-radius: var(--radius-lg);
  color: var(--ink-deep);
  box-shadow: var(--shadow-float);
}

.page-about .board-kicker {
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--amber-deep);
  margin: 0 0 6px;
}

.page-about .board-title {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 3vw, 1.35rem);
  margin: 0 0 12px;
  color: var(--ink-950);
}

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

.page-about .board-list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-height: 44px;
  padding: 11px 2px;
  color: var(--ink-deep);
  text-decoration: none;
  border-bottom: 1px dashed rgba(27, 39, 64, .2);
  font-size: .95rem;
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}

.page-about .board-list li:last-child a {
  border-bottom: 0;
}

.page-about .board-list a .mono {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--amber-deep);
}

.page-about .board-list a:hover,
.page-about .board-list a:focus-visible {
  color: var(--coral-500);
  padding-left: 6px;
}

/* ---------- 通用章节头 ---------- */
.page-about .section-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: clamp(20px, 3.6vw, 34px);
}

.page-about .section-head .section-title {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4vw, 2rem);
  line-height: 1.3;
  margin: 8px 0 0;
  color: var(--paper-100);
}

.page-about .head-note {
  margin: 0;
  color: var(--slate-300);
  font-size: .95rem;
  line-height: 1.8;
  max-width: 46ch;
}

/* ---------- 起源与定位 ---------- */
.page-about .about-origin {
  padding: clamp(28px, 5vw, 56px) 0;
}

.page-about .origin-split {
  display: grid;
  gap: clamp(20px, 4vw, 40px);
}

.page-about .origin-text p {
  margin: 0 0 16px;
  color: var(--slate-300);
  line-height: 1.9;
  font-size: 1rem;
  max-width: 58ch;
}

.page-about .origin-text p:first-child {
  color: var(--paper-100);
  font-size: 1.05rem;
}

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

.page-about .origin-notes {
  display: grid;
  gap: 14px;
}

.page-about .note-card {
  border-radius: var(--radius-md);
  padding: 18px 20px;
  background: var(--ink-800);
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--amber-500);
}

.page-about .note-card--offset {
  border-left-color: var(--teal-400);
}

.page-about .note-label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--amber-200);
}

.page-about .note-card--offset .note-label {
  color: var(--teal-400);
}

.page-about .note-body {
  margin: 0;
  color: var(--slate-300);
  line-height: 1.85;
  font-size: .95rem;
}

/* ---------- 发展脉络 ---------- */
.page-about .about-stages {
  position: relative;
  padding: clamp(32px, 6vw, 68px) 0;
  background: var(--ink-900);
  overflow: hidden;
}

.page-about .stage-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .1;
  filter: saturate(.6);
  pointer-events: none;
}

.page-about .about-stages .container {
  position: relative;
  z-index: 1;
}

.page-about .stage-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .stage-track::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 12px;
  border-left: 1px dashed var(--hairline-strong);
}

.page-about .stage-item {
  position: relative;
  padding: 0 0 14px 36px;
}

.page-about .stage-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: var(--ink-950);
  border: 2px solid var(--amber-500);
  box-shadow: 0 0 0 4px rgba(232, 163, 61, .1);
}

.page-about .stage-item details {
  background: rgba(22, 36, 61, .72);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 0 16px;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .stage-item details[open] {
  border-color: rgba(232, 163, 61, .45);
  background: rgba(22, 36, 61, .92);
}

.page-about .stage-item summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 12px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .stage-item summary::-webkit-details-marker {
  display: none;
}

.page-about .stage-item summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--amber-500);
  font-size: 15px;
}

.page-about .stage-item details[open] summary::after {
  content: "－";
}

.page-about .stage-item summary:focus-visible {
  outline: 2px solid var(--teal-400);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.page-about .stage-version {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink-950);
  background: var(--amber-500);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  font-weight: 600;
}

.page-about .stage-name {
  font-family: var(--font-display);
  font-size: 1.02rem;
  color: var(--paper-100);
}

.page-about .stage-body {
  margin: 0 0 14px;
  padding-left: 0;
  color: var(--slate-300);
  line-height: 1.85;
  font-size: .95rem;
}

/* ---------- 三条坚持 ---------- */
.page-about .about-values {
  padding: clamp(32px, 6vw, 68px) 0;
}

.page-about .value-list {
  display: grid;
  gap: 0;
}

.page-about .value-item {
  display: grid;
  gap: 14px;
  padding: clamp(18px, 3vw, 28px) 0;
  border-top: 1px solid var(--hairline);
}

.page-about .value-item:last-child {
  border-bottom: 1px solid var(--hairline);
}

.page-about .value-item:focus-visible {
  outline: 2px solid var(--amber-500);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.page-about .value-headline {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 4.4vw, 2rem);
  line-height: 1.35;
  margin: 0;
  color: var(--amber-200);
}

.page-about .value-note {
  border-radius: var(--radius-lg);
  padding: clamp(16px, 3vw, 24px);
  color: var(--ink-deep);
}

.page-about .value-note p {
  margin: 0 0 12px;
  line-height: 1.85;
  font-size: .97rem;
}

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

.page-about .note-mark {
  font-size: .9rem;
  color: var(--ink-muted);
  padding-left: 14px;
  border-left: 2px solid rgba(242, 107, 78, .5);
  transition: background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .value-item:hover .note-mark,
.page-about .value-item:focus-within .note-mark,
.page-about .value-item:focus-visible .note-mark {
  background: rgba(246, 217, 168, .55);
  border-left-color: var(--coral-500);
}

/* ---------- 团队与审核 ---------- */
.page-about .about-team {
  padding: clamp(32px, 6vw, 68px) 0;
  background: var(--ink-900);
}

.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .team-lede {
  margin: 0 0 24px;
  color: var(--slate-300);
  line-height: 1.9;
  max-width: 52ch;
}

.page-about .team-bars {
  display: grid;
  gap: 20px;
}

.page-about .bar-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--paper-100);
  margin-bottom: 8px;
}

.page-about .bar-meta span:last-child {
  color: var(--amber-200);
}

.page-about .bar-track {
  height: 12px;
  border-radius: var(--radius-pill);
  background: rgba(169, 180, 196, .16);
  overflow: hidden;
}

.page-about .bar-fill {
  height: 100%;
  border-radius: var(--radius-pill);
}

.page-about .bar-fill--editorial {
  width: 46%;
  background: linear-gradient(90deg, var(--amber-500), var(--amber-200));
}

.page-about .bar-fill--product {
  width: 19%;
  background: linear-gradient(90deg, var(--teal-400), #7ee6dc);
}

.page-about .bar-fill--review {
  width: 35%;
  background: linear-gradient(90deg, var(--coral-500), #f79e8b);
}

.page-about .bar-desc {
  margin: 8px 0 0;
  font-size: .88rem;
  color: var(--slate-300);
}

.page-about .team-side {
  display: grid;
  gap: 20px;
}

.page-about .team-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--hairline);
  background: var(--ink-800);
}

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

.page-about .team-figure figcaption {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--slate-300);
  padding: 10px 14px;
}

.page-about .review-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .review-steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  padding: 14px 16px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  background: rgba(22, 36, 61, .6);
}

.page-about .step-num {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--amber-200);
  border: 1px solid rgba(232, 163, 61, .4);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  white-space: nowrap;
}

.page-about .review-steps h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  color: var(--paper-100);
}

.page-about .review-steps p {
  margin: 0;
  color: var(--slate-300);
  font-size: .92rem;
  line-height: 1.8;
}

/* ---------- 内容体量 ---------- */
.page-about .about-scale {
  padding: clamp(32px, 6vw, 68px) 0;
}

.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .scale-cell {
  padding: 16px 14px;
  border-radius: var(--radius-md);
  background: var(--ink-800);
  border: 1px solid var(--hairline);
}

.page-about .scale-cell:nth-child(3n + 2) {
  background: var(--ink-900);
}

.page-about .scale-num {
  margin: 0 0 6px;
  font-size: clamp(1.5rem, 5vw, 2rem);
  line-height: 1.1;
  color: var(--amber-200);
  letter-spacing: -.01em;
}

.page-about .scale-num small {
  font-size: .55em;
  color: var(--slate-300);
  margin-left: 4px;
  letter-spacing: .04em;
}

.page-about .scale-label {
  margin: 0;
  font-size: .86rem;
  line-height: 1.6;
  color: var(--slate-300);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  position: relative;
  padding: clamp(32px, 6vw, 68px) 0;
  background: var(--ink-950);
  overflow: hidden;
}

.page-about .eco-art {
  position: absolute;
  right: -6%;
  bottom: -6%;
  width: min(680px, 120%);
  color: var(--amber-500);
  opacity: .16;
  pointer-events: none;
}

.page-about .eco-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(18px, 3.4vw, 32px);
}

.page-about .eco-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--hairline-strong);
  margin: 0;
}

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

.page-about .eco-figure figcaption {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--slate-300);
  padding: 10px 14px;
  background: rgba(16, 27, 46, .9);
}

.page-about .eco-cards {
  display: grid;
  gap: 14px;
}

.page-about .eco-card {
  padding: 20px;
  border-radius: var(--radius-md);
  background: rgba(22, 36, 61, .86);
  border: 1px solid var(--hairline);
  transition: transform .2s var(--ease), border-color .2s var(--ease);
}

.page-about .eco-card:hover,
.page-about .eco-card:focus-within {
  transform: translateY(-3px);
  border-color: rgba(232, 163, 61, .5);
}

.page-about .eco-tag {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--teal-400);
}

.page-about .eco-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.12rem;
  color: var(--paper-100);
}

.page-about .eco-card p {
  margin: 0 0 12px;
  color: var(--slate-300);
  font-size: .93rem;
  line-height: 1.85;
}

.page-about .eco-link {
  margin: 0;
}

.page-about .eco-link a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--amber-200);
  font-size: .9rem;
  text-decoration: none;
  border-bottom: 1px solid rgba(246, 217, 168, .45);
}

.page-about .eco-link a:hover,
.page-about .eco-link a:focus-visible {
  color: var(--coral-500);
  border-bottom-color: var(--coral-500);
}

/* ---------- 承诺 ---------- */
.page-about .about-promise {
  padding: clamp(32px, 6vw, 72px) 0 0;
}

.page-about .promise-card {
  position: relative;
  border-radius: var(--radius-lg);
  padding: clamp(22px, 4vw, 44px);
  color: var(--ink-deep);
  box-shadow: var(--shadow-float);
  overflow: hidden;
}

.page-about .promise-stamp {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--paper-100);
  background: var(--coral-500);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  transform: rotate(3deg);
}

.page-about .promise-eyebrow {
  color: var(--amber-deep);
}

.page-about .promise-card .section-title {
  color: var(--ink-950);
  max-width: 22ch;
}

.page-about .promise-grid {
  display: grid;
  gap: 18px;
  margin: 22px 0 26px;
}

.page-about .promise-block {
  padding-left: 14px;
  border-left: 2px solid rgba(27, 39, 64, .18);
}

.page-about .promise-num {
  margin: 0 0 6px;
  font-size: 1.4rem;
  line-height: 1.1;
  color: var(--amber-deep);
}

.page-about .promise-block h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  color: var(--ink-950);
}

.page-about .promise-block p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--ink-deep);
}

.page-about .promise-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .promise-actions .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .eco-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .promise-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: 5fr 6fr;
    gap: clamp(32px, 4vw, 60px);
  }
  .page-about .section-head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    gap: 32px;
  }
  .page-about .head-note {
    text-align: right;
    max-width: 34ch;
  }
  .page-about .origin-split {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }
  .page-about .origin-notes {
    margin-top: 26px;
  }
  .page-about .note-card--offset {
    margin-left: 26px;
  }
  .page-about .value-item {
    grid-template-columns: 3fr 8fr;
    gap: clamp(24px, 5vw, 64px);
    align-items: start;
  }
  .page-about .team-grid {
    grid-template-columns: 6fr 6fr;
    align-items: start;
  }
  .page-about .team-side {
    margin-top: 18px;
  }
  .page-about .eco-inner {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }
  .page-about .eco-inner .section-head {
    grid-column: 1 / -1;
  }
  .page-about .eco-figure {
    margin-top: 20px;
  }
  .page-about .eco-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .eco-card:nth-child(2) {
    transform: translateY(18px);
  }
  .page-about .eco-card:nth-child(2):hover,
  .page-about .eco-card:nth-child(2):focus-within {
    transform: translateY(14px);
  }
  .page-about .promise-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }
  .page-about .promise-card .section-title {
    max-width: 30ch;
  }
}

@media (min-width: 1120px) {
  .page-about .about-hero-copy {
    padding-top: 12px;
  }
  .page-about .stage-item {
    padding-left: 44px;
  }
  .page-about .stage-track::before {
    left: 11px;
  }
  .page-about .stage-item::before {
    width: 23px;
    height: 23px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-glow {
    animation: none;
  }
  .page-about .board-list a,
  .page-about .eco-card,
  .page-about .note-mark {
    transition: none;
  }
  .page-about .eco-card:hover,
  .page-about .eco-card:focus-within {
    transform: none;
  }
}