.page-about {
  position: relative;
  --about-num-size: clamp(2.2rem, 6.4vw, 3.6rem);
  --about-rule: rgba(39, 67, 95, 0.75);
  color: var(--paper);
  padding-bottom: clamp(3rem, 7vw, 6rem);
  overflow-x: clip;
  background:
    radial-gradient(900px 520px at 90% -6%, rgba(45, 226, 230, 0.16), transparent 68%),
    radial-gradient(720px 460px at 4% 6%, rgba(255, 107, 74, 0.13), transparent 70%),
    linear-gradient(180deg, #06111f 0%, #081725 46%, #06111f 100%);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(39, 67, 95, 0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(39, 67, 95, 0.42) 1px, transparent 1px);
  background-size: 76px 76px;
  opacity: 0.3;
  -webkit-mask-image: radial-gradient(120% 78% at 50% 0%, #000 26%, transparent 82%);
  mask-image: radial-gradient(120% 78% at 50% 0%, #000 26%, transparent 82%);
}

.page-about > * {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  margin: 0 0 clamp(1rem, 3vw, 1.6rem);
  font-size: 0.8rem;
  color: var(--slate);
}

.page-about .breadcrumb a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--cyan-soft);
}

.page-about h1 {
  margin: 0.45rem 0 1rem;
  font-size: clamp(2rem, 5.6vw, 3.6rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about h2 {
  margin: 0;
  font-size: clamp(1.25rem, 2.8vw, 1.7rem);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.01em;
}

.page-about h3 {
  margin: 0.3rem 0 0.45rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(0.96rem, 1.6vw, 1.04rem);
  line-height: 1.78;
  color: #d6e2f0;
}

/* 档案封面 */
.about-cover {
  padding-bottom: clamp(1.6rem, 4vw, 2.8rem);
}

.about-cover__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.8rem);
  align-items: end;
}

.about-cover__meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1.4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--about-rule);
}

.about-cover__meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
}

.about-cover__meta-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
}

.about-cover__meta-value {
  font-size: clamp(1rem, 2.4vw, 1.25rem);
  font-weight: 700;
  color: var(--cyan);
  word-break: break-word;
}

.about-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-m);
  background:
    linear-gradient(150deg, rgba(45, 226, 230, 0.2), rgba(255, 107, 74, 0.16)),
    var(--panel);
  box-shadow: var(--stack-shadow);
}

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

.about-media--cover {
  aspect-ratio: 3 / 2;
}

.about-media--wide {
  aspect-ratio: 7 / 3;
  margin-top: 1.2rem;
}

.about-media--team {
  aspect-ratio: 4 / 3;
  margin: 1.15rem 0 0;
}

.about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.3rem;
}

/* 主体双栏 */
.about-body {
  gap: clamp(1.3rem, 3vw, 2.2rem);
  align-items: start;
}

.about-toc {
  padding: 0.9rem 1rem;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-m);
  background: rgba(11, 30, 51, 0.72);
}

.page-about .about-toc .toc__title {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--coral);
}

.page-about .about-toc .toc__list {
  display: flex;
  gap: 0.5rem;
  margin: 0.7rem 0 0;
  padding: 0 0 0.4rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc .toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc a {
  display: inline-block;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-pill);
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--slate);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a[aria-current="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.about-col {
  display: grid;
  gap: clamp(1.1rem, 3vw, 1.8rem);
  min-width: 0;
}

/* 面板 */
.about-panel {
  padding: clamp(1.1rem, 3vw, 1.8rem);
}

.about-panel__head {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  margin-bottom: 1rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--about-rule);
}

.about-panel__num {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--coral);
}

.about-panel p {
  margin: 0 0 0.85rem;
  font-size: 0.97rem;
  line-height: 1.78;
  color: #d6e2f0;
}

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

.about-panel strong {
  color: var(--cyan-soft);
  font-weight: 600;
}

.about-list {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.65rem;
}

.about-list li {
  position: relative;
  padding: 0.7rem 0.85rem 0.7rem 2rem;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-s);
  background: rgba(18, 48, 74, 0.55);
  font-size: 0.93rem;
  line-height: 1.68;
  color: var(--slate);
}

.about-list li::before {
  content: "";
  position: absolute;
  left: 0.85rem;
  top: 1.2rem;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--cyan);
}

.about-list li:nth-child(2)::before {
  background: var(--amber);
}

.about-list li:nth-child(3)::before {
  background: var(--mint);
}

.about-list li:nth-child(4)::before {
  background: var(--coral);
}

.about-note {
  margin-top: 1rem !important;
  padding: 0.8rem 0.95rem;
  border-left: 2px solid var(--cyan);
  background: rgba(45, 226, 230, 0.07);
  font-size: 0.9rem !important;
  color: var(--slate) !important;
}

/* 数字索引墙 */
.about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.about-stat {
  padding: clamp(0.85rem, 2.4vw, 1.3rem);
  background: var(--panel);
  min-width: 0;
}

.about-stat__num {
  display: block;
  font-family: var(--mono);
  font-size: var(--about-num-size);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.about-stat__unit {
  margin-left: 0.12em;
  font-size: 0.34em;
  letter-spacing: 0;
  color: var(--slate);
}

.about-stat__label {
  display: block;
  margin-top: 0.55rem;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--slate);
}

.about-stat:nth-child(2) .about-stat__num {
  color: var(--coral);
}

.about-stat:nth-child(3) .about-stat__num {
  color: var(--mint);
}

.about-stat:nth-child(4) .about-stat__num {
  color: var(--amber);
}

.about-stat:nth-child(5) .about-stat__num {
  color: var(--cyan-soft);
}

.about-stat:nth-child(6) .about-stat__num {
  color: var(--paper);
}

/* 团队 */
.about-team {
  display: grid;
  gap: 1px;
  margin-top: 1rem;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.about-team__item {
  padding: 1rem 1.05rem;
  background: var(--panel);
}

.about-team__role {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.about-team__desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.68;
  color: var(--slate);
}

/* 版本时间线 */
.about-timeline {
  overflow-x: auto;
  padding-bottom: 0.6rem;
  scrollbar-width: thin;
  scroll-snap-type: x proximity;
}

.about-timeline__track {
  position: relative;
  display: flex;
  gap: 0.85rem;
  min-width: max-content;
  padding-top: 1.85rem;
}

.about-timeline__track::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0.6rem;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--mint) 45%, var(--coral));
  opacity: 0.55;
}

.about-node {
  position: relative;
  flex: 0 0 auto;
  width: min(74vw, 262px);
  scroll-snap-align: start;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-m);
  background: var(--panel);
}

.about-node::before {
  content: "";
  position: absolute;
  top: -1.42rem;
  left: 0.95rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(45, 226, 230, 0.18);
}

.about-node:nth-child(even)::before {
  background: var(--coral);
  box-shadow: 0 0 0 4px rgba(255, 107, 74, 0.18);
}

.about-node[open] {
  border-color: rgba(45, 226, 230, 0.55);
  background: linear-gradient(170deg, rgba(18, 48, 74, 0.95), rgba(11, 30, 51, 0.95));
}

.about-node__summary {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  cursor: pointer;
  list-style: none;
}

.about-node__summary::-webkit-details-marker {
  display: none;
}

.about-node__year {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.about-node__title {
  display: block;
  padding-right: 1rem;
  font-size: 0.96rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.about-node__summary::after {
  content: "+";
  position: absolute;
  right: 0.85rem;
  top: 0.8rem;
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--slate);
}

.about-node[open] .about-node__summary::after {
  content: "–";
  color: var(--cyan);
}

.about-node__body {
  margin: 0.7rem 0 0;
  padding-top: 0.7rem;
  border-top: 1px dashed var(--about-rule);
  font-size: 0.86rem;
  line-height: 1.68;
  color: var(--slate);
}

/* 评测表 */
.about-table-wrap {
  margin-top: 1rem;
  overflow-x: auto;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-m);
}

.about-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.about-table th,
.about-table td {
  padding: 0.72rem 0.85rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid rgba(39, 67, 95, 0.7);
  line-height: 1.6;
}

.about-table thead th {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
  background: var(--card);
  white-space: nowrap;
}

.about-table tbody td {
  color: #d6e2f0;
}

.about-table tbody td:first-child {
  color: var(--paper);
  font-weight: 600;
  white-space: nowrap;
}

.about-table tbody tr:nth-child(even) td {
  background: rgba(18, 48, 74, 0.45);
}

/* 合作标签 */
.about-partners {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
}

.about-partner {
  display: inline-flex;
  flex-direction: column;
  gap: 0.16rem;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-s);
  background: linear-gradient(160deg, rgba(18, 48, 74, 0.92), rgba(11, 30, 51, 0.92));
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--paper);
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.about-partner__use {
  font-family: var(--sans);
  font-size: 0.72rem;
  color: var(--slate);
  opacity: 0.72;
  transition: opacity 0.22s var(--ease), color 0.22s var(--ease);
}

.about-partner:hover,
.about-partner:focus-within {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.about-partner:hover .about-partner__use,
.about-partner:focus-within .about-partner__use {
  opacity: 1;
  color: var(--cyan-soft);
}

/* 联络 */
.about-contact {
  display: grid;
  gap: 0.7rem;
  margin-top: 1rem;
}

.about-contact__row {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-s);
  background: rgba(18, 48, 74, 0.5);
  min-width: 0;
}

.about-contact__label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
}

.about-contact__value {
  font-size: 0.98rem;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.about-contact__value a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(45, 226, 230, 0.4);
}

.about-contact__value a:hover {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

@media (min-width: 620px) {
  .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 780px) {
  .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .about-cover__grid {
    grid-template-columns: 1.08fr 0.92fr;
  }

  .about-body {
    grid-template-columns: 232px minmax(0, 1fr);
  }

  .about-toc {
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-toc .toc__list {
    display: grid;
    gap: 0.4rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc a {
    display: block;
    border-radius: var(--radius-s);
    white-space: normal;
  }

  .about-panel p {
    font-size: 1rem;
  }
}

@media (min-width: 1200px) {
  .about-body {
    grid-template-columns: 260px minmax(0, 1fr);
  }

  .about-node {
    width: 280px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-partner,
  .page-about .about-toc a {
    transition: none;
  }

  .about-partner:hover,
  .about-partner:focus-within {
    transform: none;
  }
}