/* ==========================================================
   品牌档案  /brand/   .page-about
   ========================================================== */

.page-about {
  --about-gap: clamp(1.25rem, 2.4vw, 1.75rem);
  --about-pad: clamp(1.4rem, 2.6vw, 2.1rem);
  --about-rule-dark: rgba(42, 33, 24, .16);
  --about-rule-light: rgba(139, 132, 201, .28);
  background: var(--void);
  color: var(--starlight);
}

/* ── 面包屑 ───────────────────────────────────── */

.page-about .breadcrumb {
  padding-block: clamp(.85rem, 2vw, 1.3rem);
  border-bottom: 1px solid var(--line-darker);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: .875rem;
}

.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-inline-end: .45rem;
  color: var(--dust);
}

.page-about .breadcrumb__list a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb__list a:hover,
.page-about .breadcrumb__list a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumb__list [aria-current="page"] {
  color: var(--dust);
}

/* ── 通用标题组 ───────────────────────────────── */

.page-about .section-head h2,
.page-about .about-origin h2,
.page-about .about-closing h2 {
  margin: .6rem 0 0;
  font-size: clamp(1.7rem, 3.8vw, 2.6rem);
  line-height: 1.22;
  letter-spacing: .005em;
  color: inherit;
}

.page-about .star-rule {
  display: block;
  width: 76px;
  height: 3px;
  margin: 1.15rem 0 0;
  position: relative;
  border: 0;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--gold), var(--cyan));
}

.page-about .star-rule::after {
  content: "";
  position: absolute;
  right: -4px;
  top: 50%;
  width: 8px;
  height: 8px;
  margin-top: -4px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(62, 230, 196, .75);
}

.page-about .section-head .lede,
.page-about .about-closing__panel p {
  margin-top: 1.1rem;
  max-width: 42em;
}

.page-about .section--paper {
  color: var(--ink);
}

.page-about .section--paper .eyebrow,
.page-about .section--paper .lede {
  color: var(--ink);
}

.page-about .section--paper .lede {
  opacity: .78;
}

/* ── 首屏 ─────────────────────────────────────── */

.page-about .about-hero {
  padding-top: clamp(2.25rem, 5vw, 3.5rem);
  padding-bottom: clamp(2.25rem, 5vw, 3.5rem);
  background:
    radial-gradient(ellipse 78% 58% at 12% 0%, rgba(75, 63, 158, .48), transparent 66%),
    radial-gradient(ellipse 46% 42% at 94% 12%, rgba(62, 230, 196, .13), transparent 72%),
    linear-gradient(178deg, var(--void) 0%, var(--nebula) 100%);
}

.page-about .about-hero__copy {
  max-width: 52rem;
}

.page-about .about-hero h1 {
  margin: .8rem 0 1.1rem;
  font-size: clamp(2rem, 6vw, 3.85rem);
  line-height: 1.1;
  letter-spacing: .005em;
  color: var(--starlight);
}

.page-about .about-hero .lede {
  max-width: 40em;
  color: var(--mist);
}

.page-about .about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 1.6rem;
}

.page-about .about-hero__chips .tag {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .06em;
}

.page-about .about-hero__cover {
  margin: clamp(2rem, 5vw, 3.25rem) 0 0;
  aspect-ratio: 16 / 9;
  min-height: 200px;
}

.page-about .media-frame {
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ── 品牌从哪里来 ─────────────────────────────── */

.page-about .about-origin__layout {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
  grid-template-columns: 1fr;
}

.page-about .about-origin__prose p {
  max-width: 42em;
}

.page-about .about-origin__facts {
  display: grid;
  gap: 1.1rem;
  align-content: start;
}

.page-about .about-fact {
  padding: .2rem 0 .2rem 1.25rem;
  border-left: 3px solid var(--galactic);
}

.page-about .about-fact__k {
  margin: 0;
  font-size: clamp(1.35rem, 3vw, 1.7rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--galactic);
}

.page-about .about-fact__v {
  margin: .3rem 0 0;
  font-size: .92rem;
  line-height: 1.6;
  color: var(--ink);
  opacity: .78;
}

/* ── 发展脉络 / 时间刻度 ──────────────────────── */

.page-about .about-timeline {
  background:
    radial-gradient(ellipse 70% 55% at 88% 6%, rgba(75, 63, 158, .38), transparent 68%),
    linear-gradient(180deg, var(--void) 0%, var(--nebula) 100%);
}

.page-about .about-timeline__layout {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
  grid-template-columns: 1fr;
  margin-top: clamp(2rem, 4.5vw, 3rem);
}

.page-about .about-timeline__visual {
  margin: 0;
  aspect-ratio: 4 / 5;
}

.page-about .about-phases__track {
  position: relative;
  display: flex;
  gap: .6rem;
  overflow-x: auto;
  padding: 0 0 1.1rem;
  border-bottom: 1px solid var(--about-rule-light);
  scrollbar-width: thin;
}

.page-about .about-phase-btn {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: .2rem;
  padding: .7rem 1.05rem;
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  background: transparent;
  border: 1px solid var(--about-rule-light);
  border-radius: var(--radius);
  color: var(--starlight);
  transition: background-color .25s var(--ease), border-color .25s var(--ease), color .25s var(--ease);
}

.page-about .about-phase-btn:hover {
  border-color: var(--cyan);
}

.page-about .about-phase-btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-phase-btn__year {
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--dust);
}

.page-about .about-phase-btn__name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--starlight);
}

.page-about .about-phase-btn[aria-selected="true"] {
  background: var(--cream);
  border-color: var(--cream);
}

.page-about .about-phase-btn[aria-selected="true"] .about-phase-btn__year {
  color: var(--gold-deep);
}

.page-about .about-phase-btn[aria-selected="true"] .about-phase-btn__name {
  color: var(--ink);
}

.page-about .about-phase-panel {
  margin-top: clamp(1.5rem, 3vw, 2rem);
}

.page-about .about-phase-panel__eyebrow {
  margin: 0;
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .about-phase-panel h3 {
  margin: .55rem 0 .85rem;
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  line-height: 1.3;
  color: var(--starlight);
}

.page-about .about-phase-panel > p {
  margin: 0;
  max-width: 42em;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-phase-panel__list {
  display: grid;
  gap: .65rem;
  margin: 1.3rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-phase-panel__list li {
  position: relative;
  padding-left: 1.5rem;
  font-size: .95rem;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-phase-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .58rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(62, 230, 196, .18);
}

/* ── 团队与分工 ───────────────────────────────── */

.page-about .about-team__layout {
  display: grid;
  gap: clamp(2rem, 4vw, 3rem);
  grid-template-columns: 1fr;
  align-items: center;
  margin-top: clamp(2rem, 4.5vw, 3rem);
}

.page-about .about-ring {
  position: relative;
  width: min(270px, 66vw);
  aspect-ratio: 1;
  margin-inline: auto;
}

.page-about .about-ring__donut {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    var(--galactic) 0deg 120deg,
    var(--vermilion) 120deg 220deg,
    var(--cyan-ink) 220deg 360deg
  );
  -webkit-mask: radial-gradient(circle at 50% 50%, transparent 0 61%, #000 61% 100%);
  mask: radial-gradient(circle at 50% 50%, transparent 0 61%, #000 61% 100%);
}

.page-about .about-ring__core {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  z-index: 1;
}

.page-about .about-ring__num {
  display: block;
  font-size: clamp(2rem, 6vw, 2.7rem);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-ring__unit {
  display: block;
  margin-top: .3rem;
  font-size: .76rem;
  letter-spacing: .2em;
  color: var(--ink);
  opacity: .6;
}

.page-about .about-team__list {
  display: grid;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__item {
  position: relative;
  padding-left: 1.6rem;
  border-left: 2px solid var(--about-rule-dark);
}

.page-about .about-team__dot {
  position: absolute;
  left: -6px;
  top: .42rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  box-shadow: 0 0 0 3px var(--cream);
}

.page-about .about-team__dot--a { background: var(--galactic); }
.page-about .about-team__dot--b { background: var(--vermilion); }
.page-about .about-team__dot--c { background: var(--cyan-ink); }

.page-about .about-team__name {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-team__name .mono {
  color: var(--galactic);
}

.page-about .about-team__desc {
  margin: .45rem 0 0;
  max-width: 40em;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--ink);
  opacity: .8;
}

/* ── 内容与版本节奏 ───────────────────────────── */

.page-about .about-rhythm {
  background:
    radial-gradient(ellipse 64% 50% at 14% 100%, rgba(75, 63, 158, .35), transparent 70%),
    linear-gradient(180deg, var(--nebula) 0%, var(--void) 100%);
}

.page-about .about-rhythm__grid {
  margin-top: clamp(2rem, 4.5vw, 3rem);
}

.page-about .about-rhythm__card {
  display: flex;
  flex-direction: column;
  gap: .55rem;
  padding: var(--about-pad);
}

.page-about .about-rhythm__k {
  margin: 0;
  font-size: clamp(1.6rem, 3.4vw, 2.15rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: .01em;
  color: var(--gold);
}

.page-about .about-rhythm__card h3 {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--starlight);
}

.page-about .about-rhythm__card p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ── 资质与荣誉 ───────────────────────────────── */

.page-about .about-credits__layout {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
  grid-template-columns: 1fr;
  margin-top: clamp(2rem, 4.5vw, 3rem);
  align-items: start;
}

.page-about .about-credits__list {
  display: grid;
  gap: 1.4rem;
  margin: 0;
  padding: 0;
}

.page-about .about-credits__item {
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--about-rule-dark);
}

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

.page-about .about-credits__num {
  display: block;
  margin: 0;
  font-size: clamp(1.2rem, 2.6vw, 1.55rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--galactic);
  word-break: break-word;
}

.page-about .about-credits__label {
  margin: .35rem 0 0;
  font-size: .92rem;
  line-height: 1.6;
  color: var(--ink);
  opacity: .78;
}

.page-about .about-credits__note {
  padding: var(--about-pad);
  border: 1px solid var(--about-rule-dark);
  border-radius: var(--radius);
}

.page-about .about-credits__note h3 {
  margin: 0 0 .85rem;
  font-size: 1.05rem;
  color: var(--ink);
}

.page-about .about-credits__note p {
  margin: 0 0 .85rem;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--ink);
  opacity: .82;
}

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

/* ── 合作生态 ─────────────────────────────────── */

.page-about .about-partners {
  background:
    radial-gradient(ellipse 60% 50% at 82% 88%, rgba(62, 230, 196, .1), transparent 68%),
    radial-gradient(ellipse 70% 55% at 10% 0%, rgba(75, 63, 158, .4), transparent 66%),
    linear-gradient(180deg, var(--void) 0%, var(--nebula) 100%);
}

.page-about .about-partners__layout {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
  grid-template-columns: 1fr;
  margin-top: clamp(2rem, 4.5vw, 3rem);
}

.page-about .about-partners__visual {
  margin: 0;
  aspect-ratio: 3 / 2;
}

.page-about .about-partners__cols {
  display: grid;
  gap: var(--about-gap);
  align-content: start;
}

.page-about .about-partners__card {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: var(--about-pad);
}

.page-about .about-partners__k {
  margin: 0;
  font-size: clamp(1.7rem, 3.6vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-partners__card h3 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--starlight);
}

.page-about .about-partners__card p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ── 四项对照表 ───────────────────────────────── */

.page-about .about-diff__tablewrap {
  margin-top: clamp(2rem, 4.5vw, 3rem);
  overflow-x: auto;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background: #FFFBF3;
}

.page-about .about-diff__table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: .95rem;
}

.page-about .about-diff__caption {
  padding: .9rem 1.1rem;
  text-align: left;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--cream);
  background: var(--ink);
}

.page-about .about-diff__table th,
.page-about .about-diff__table td {
  padding: .95rem 1.1rem;
  text-align: left;
  vertical-align: top;
  line-height: 1.65;
  border-bottom: 1px solid var(--about-rule-dark);
}

.page-about .about-diff__table thead th {
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--ink);
  background: rgba(217, 211, 240, .55);
  border-bottom: 2px solid var(--ink);
}

.page-about .about-diff__table tbody th {
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}

.page-about .about-diff__table tbody td {
  color: var(--ink);
  opacity: .82;
}

.page-about .about-diff__table tbody td:last-child {
  opacity: 1;
  font-weight: 500;
  box-shadow: inset 3px 0 0 rgba(196, 71, 43, 0);
  transition: box-shadow .25s var(--ease), background-color .25s var(--ease);
}

.page-about .about-diff__table tbody tr:hover td:last-child,
.page-about .about-diff__table tbody tr:focus-within td:last-child {
  background: rgba(196, 71, 43, .09);
  box-shadow: inset 3px 0 0 var(--vermilion);
}

.page-about .about-diff__table tbody tr:hover {
  background: rgba(217, 211, 240, .32);
}

.page-about .about-diff__table tbody tr:last-child th,
.page-about .about-diff__table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-diff__foot {
  margin: 1.5rem 0 0;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--ink);
  opacity: .82;
}

.page-about .about-diff__foot a {
  color: var(--vermilion);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-diff__foot a:hover,
.page-about .about-diff__foot a:focus-visible {
  color: var(--galactic);
}

/* ── 收束 ─────────────────────────────────────── */

.page-about .about-closing {
  background:
    radial-gradient(ellipse 70% 60% at 50% 100%, rgba(75, 63, 158, .45), transparent 70%),
    linear-gradient(180deg, var(--nebula) 0%, var(--void) 100%);
}

.page-about .about-closing__panel {
  padding: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-closing__panel p {
  max-width: 42em;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.75rem;
}

/* ── 响应式 ───────────────────────────────────── */

@media (min-width: 880px) {
  .page-about .about-origin__layout {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-origin__facts {
    margin-top: 1rem;
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
  }

  .page-about .about-credits__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  }
}

@media (min-width: 980px) {
  .page-about .about-timeline__layout {
    grid-template-columns: minmax(0, 250px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-partners__layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (max-width: 979px) {
  .page-about .about-timeline__visual {
    aspect-ratio: 16 / 9;
  }
}

@media (max-width: 560px) {
  .page-about .about-hero h1 {
    font-size: clamp(1.75rem, 8vw, 2.4rem);
  }

  .page-about .about-phase-btn {
    padding: .55rem .8rem;
  }

  .page-about .about-closing__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .about-closing__actions .btn {
    width: 100%;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-phase-btn,
  .page-about .about-diff__table tbody td:last-child {
    transition: none;
  }
}
<<<END>>>