.page-about {
  --about-line: rgba(230, 232, 235, 0.16);
  --about-gridline: rgba(30, 144, 255, 0.14);
  --about-nebula:
    radial-gradient(70% 50% at 20% 0%, rgba(123, 47, 255, 0.28), transparent 60%),
    radial-gradient(50% 40% at 85% 20%, rgba(176, 106, 179, 0.16), transparent 70%),
    radial-gradient(60% 55% at 15% 60%, rgba(30, 144, 255, 0.12), transparent 70%);
  background: var(--sb-blue);
  color: var(--sb-silver);
  position: relative;
}

.page-about .breadcrumbs {
  padding-top: calc(var(--header-h) + 1rem);
  padding-bottom: 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: rgba(230, 232, 235, 0.62);
}

.page-about .breadcrumbs a {
  color: var(--sb-electric);
  text-decoration: none;
  margin-right: 0.5rem;
}

.page-about .breadcrumbs a::after {
  content: "/";
  color: rgba(230, 232, 235, 0.4);
  margin-left: 0.5rem;
}

/* ========== 首屏框景 ========== */
.page-about .about-hero {
  position: relative;
  padding-top: 2rem;
  padding-bottom: 3.5rem;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--about-nebula);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-hero__window {
  position: relative;
  border: 1px solid rgba(230, 232, 235, 0.2);
  background: linear-gradient(180deg, rgba(11, 31, 58, 0.62), rgba(5, 10, 20, 0.8));
  padding: 2rem 1.25rem 2.75rem;
  overflow: hidden;
  box-shadow: 0 30px 50px rgba(5, 10, 20, 0.35);
}

.page-about .about-hero__window::after {
  content: "";
  position: absolute;
  right: -30px;
  top: 45%;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(255, 106, 0, 0.12), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__ticks {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
}

.page-about .about-hero__tick {
  position: absolute;
  background: rgba(230, 232, 235, 0.4);
}

.page-about .about-hero__tick--top,
.page-about .about-hero__tick--bottom {
  width: 8px;
  height: 1px;
}

.page-about .about-hero__tick--top {
  top: -1px;
}

.page-about .about-hero__tick--bottom {
  bottom: -1px;
}

.page-about .about-hero__tick--left,
.page-about .about-hero__tick--right {
  width: 1px;
  height: 8px;
}

.page-about .about-hero__tick--left {
  left: -1px;
}

.page-about .about-hero__tick--right {
  right: -1px;
}

.page-about .about-hero__topline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid rgba(230, 232, 235, 0.14);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding-top: 2rem;
}

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

.page-about .about-hero__main h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.8rem, 4vw, 3.4rem);
  line-height: 1.25;
  margin: 0.5rem 0 1.25rem;
  color: #fff;
  letter-spacing: -0.01em;
}

.page-about .about-hero__lead {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--sb-silver);
  margin-bottom: 1rem;
}

.page-about .about-hero__desc {
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(230, 232, 235, 0.78);
  margin-bottom: 1.75rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: rgba(230, 232, 235, 0.12);
  margin: 0;
  min-width: 0;
  width: 100%;
  max-width: 420px;
  place-self: start;
}

.page-about .about-hero__stat {
  background: #0B1F3A;
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.page-about .about-hero__stat dt {
  color: rgba(230, 232, 235, 0.6);
  font-size: 0.8rem;
}

.page-about .about-hero__stat dd {
  margin: 0;
  color: var(--sb-orange);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 2rem;
  line-height: 1.1;
}

/* ========== 页内章节索引 ========== */
.page-about .about-index {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.75rem;
  scrollbar-width: none;
  border-bottom: 1px solid rgba(230, 232, 235, 0.1);
  margin-bottom: 0;
}

.page-about .about-index::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: rgba(230, 232, 235, 0.7);
  text-decoration: none;
  padding: 0.5rem 0.9rem;
  border: 1px solid rgba(230, 232, 235, 0.14);
  background: rgba(11, 31, 58, 0.7);
  transition: border-color 0.25s, color 0.25s, background 0.25s;
}

.page-about .about-index__link span {
  color: var(--sb-orange);
  font-size: 0.7rem;
}

.page-about .about-index__link.is-active,
.page-about .about-index__link:hover {
  border-color: var(--sb-orange);
  color: #fff;
  background: rgba(255, 106, 0, 0.1);
}

/* ========== 平台使命 ========== */
.page-about .about-mission {
  position: relative;
}

.page-about .about-mission::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10%;
  width: 1px;
  height: 70%;
  background: linear-gradient(to bottom, transparent, var(--sb-electric), transparent);
  opacity: 0.35;
}

.page-about .about-mission__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding-top: 2rem;
  position: relative;
}

.page-about .about-mission__intro {
  padding-right: 0;
}

.page-about .about-mission__intro p {
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(230, 232, 235, 0.84);
  margin-bottom: 1rem;
}

.page-about .about-mission__intro .btn {
  margin-top: 0.5rem;
}

.page-about .about-mission__detail {
  display: grid;
  gap: 0.75rem;
}

.page-about .about-mission__point {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 0.75rem;
  align-items: start;
  padding: 1.25rem;
  background: linear-gradient(135deg, rgba(30, 144, 255, 0.08), transparent 75%);
  border-left: 2px solid var(--sb-orange);
}

.page-about .about-mission__point .mono-label {
  color: var(--sb-orange);
  font-size: 0.75rem;
  padding-top: 0.2rem;
}

.page-about .about-mission__point strong {
  display: block;
  color: #fff;
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.page-about .about-mission__point p {
  margin: 0;
  color: rgba(230, 232, 235, 0.7);
  line-height: 1.65;
  font-size: 0.92rem;
}

.page-about .about-mission__aside {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
  padding-top: 0.5rem;
}

.page-about .about-mission__vibe {
  width: 120px;
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(30, 144, 255, 0.3);
  background: rgba(123, 47, 255, 0.06);
  transform: rotate(-6deg);
}

/* ========== 里程碑时间轴 ========== */
.page-about .about-milestones {
  position: relative;
  background: linear-gradient(180deg, rgba(123, 47, 255, 0.08), transparent 30%);
}

.page-about .about-timeline {
  position: relative;
  padding-left: 1rem;
  padding-top: 1rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 28px;
  width: 1px;
  background: linear-gradient(to bottom, rgba(255, 106, 0, 0.9), rgba(30, 144, 255, 0.5), rgba(123, 47, 255, 0.2));
}

.page-about .about-timeline__row {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 1rem;
  position: relative;
  margin-bottom: 1.5rem;
}

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

.page-about .about-timeline__coord {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  color: rgba(230, 232, 235, 0.6);
  font-size: 0.7rem;
  min-width: 0;
}

.page-about .about-timeline__node {
  color: var(--sb-orange);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 106, 0, 0.7);
  background: #0B1F3A;
  border-radius: 50%;
  transition: box-shadow 0.3s, transform 0.3s;
}

.page-about .about-timeline__row:hover .about-timeline__node {
  box-shadow: 0 0 0 6px rgba(255, 106, 0, 0.15);
  transform: scale(1.08);
}

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

.page-about .about-timeline__panel .panel__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(11, 31, 58, 0.86);
  border: 1px solid rgba(230, 232, 235, 0.14);
  padding: 1rem 1.1rem;
  color: #fff;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-body);
  transition: border-color 0.25s, background 0.25s;
}

.page-about .about-timeline__panel .panel__trigger:hover {
  border-color: rgba(255, 106, 0, 0.6);
  background: rgba(26, 54, 94, 0.9);
}

.page-about .about-timeline__ver {
  color: var(--sb-orange);
  font-size: 0.8rem;
  display: inline-flex;
  padding: 0.25rem 0.55rem;
  border: 1px solid rgba(255, 106, 0, 0.45);
  background: rgba(255, 106, 0, 0.08);
}

.page-about .about-timeline__name {
  font-size: 1rem;
  font-weight: 700;
}

.page-about .about-timeline__plus {
  margin-left: auto;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--sb-orange);
  transition: transform 0.3s;
}

.page-about .about-timeline__panel[data-open] .about-timeline__plus {
  transform: rotate(45deg);
}

.page-about .about-timeline__panel .panel__content {
  border-top-width: 0;
}

.page-about .about-timeline__panel .panel__content-inner {
  padding: 1.1rem;
  background: rgba(5, 10, 20, 0.6);
  border: 1px solid rgba(230, 232, 235, 0.1);
  border-top-width: 0;
}

.page-about .about-timeline__panel .panel__content-inner p {
  margin: 0;
  color: rgba(230, 232, 235, 0.78);
  line-height: 1.75;
  font-size: 0.95rem;
}

.page-about .about-milestones__aside {
  margin-top: 2rem;
}

/* ========== 数据服务能力 ========== */
.page-about .about-data {
  position: relative;
}

.page-about .about-data::before {
  content: "";
  position: absolute;
  right: 0;
  top: 15%;
  width: 55%;
  height: 60%;
  background: radial-gradient(ellipse, rgba(30, 144, 255, 0.12), transparent 70%);
  pointer-events: none;
}

.page-about .about-data__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding-top: 2rem;
  position: relative;
}

.page-about .about-data__copy h3 {
  color: #fff;
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.page-about .about-data__copy p {
  color: rgba(230, 232, 235, 0.8);
  line-height: 1.8;
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

.page-about .about-data__list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-data__list li {
  position: relative;
  padding-left: 1.5rem;
  color: rgba(230, 232, 235, 0.82);
  font-size: 0.95rem;
  line-height: 1.6;
}

.page-about .about-data__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 8px;
  height: 8px;
  background: var(--sb-orange);
  transform: rotate(45deg);
}

.page-about .about-data__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-data__map {
  align-self: center;
}

/* ========== 合规与备案 ========== */
.page-about .about-compliance {
  position: relative;
}

.page-about .about-compliance__banner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  background: linear-gradient(135deg, #0B1F3A 0%, #38206A 60%, rgba(123, 47, 255, 0.45) 130%);
  border: 1px solid rgba(230, 232, 235, 0.14);
  border-left: 4px solid var(--sb-orange);
  padding: 2rem 1.5rem;
  overflow: hidden;
}

.page-about .about-compliance__banner::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -60px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(30, 144, 255, 0.2), transparent 70%);
}

.page-about .about-compliance__shield {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(30, 144, 255, 0.5);
  background: rgba(11, 31, 58, 0.6);
}

.page-about .about-compliance__body h2 {
  color: #fff;
  font-size: 1.5rem;
  margin: 0.35rem 0 0.75rem;
}

.page-about .about-compliance__body p {
  color: rgba(230, 232, 235, 0.78);
  line-height: 1.8;
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

.page-about .about-compliance__meta {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-compliance__meta li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.7rem 0;
  border-bottom: 1px solid rgba(230, 232, 235, 0.12);
}

.page-about .about-compliance__meta li:last-child {
  border-bottom-width: 0;
}

.page-about .about-compliance__meta .mono-label {
  color: rgba(230, 232, 235, 0.55);
  font-size: 0.75rem;
  min-width: 96px;
}

.page-about .about-compliance__meta strong {
  color: #fff;
  font-size: 0.95rem;
  word-break: break-all;
}

/* ========== 用户与生态 ========== */
.page-about .about-ecosystem {
  position: relative;
}

.page-about .about-ecosystem::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--about-nebula);
  opacity: 0.5;
  pointer-events: none;
}

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

.page-about .about-ecosystem__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding-top: 2rem;
}

.page-about .about-ecosystem__copy h3 {
  color: #fff;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.page-about .about-ecosystem__copy p {
  color: rgba(230, 232, 235, 0.8);
  line-height: 1.78;
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.page-about .about-ecosystem__fig {
  align-self: center;
}

.page-about .about-ecosystem__nudge {
  display: flex;
  flex-direction: column;
  gap: 0;
  align-self: start;
  padding: 1.25rem;
  background: rgba(5, 10, 20, 0.55);
  border: 1px solid rgba(230, 232, 235, 0.12);
}

.page-about .about-ecosystem__nudge .coord-label {
  margin-bottom: 0.5rem;
}

.page-about .about-ecosystem__nudge .eyebrow {
  margin-bottom: 0.75rem;
}

.page-about .about-ecosystem__nudge a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.85rem 0;
  color: rgba(230, 232, 235, 0.85);
  text-decoration: none;
  border-bottom: 1px solid rgba(230, 232, 235, 0.1);
  font-size: 0.92rem;
  transition: color 0.25s, background 0.25s, padding-left 0.25s;
}

.page-about .about-ecosystem__nudge a:last-child {
  border-bottom-width: 0;
}

.page-about .about-ecosystem__nudge a span:last-child {
  color: var(--sb-orange);
}

.page-about .about-ecosystem__nudge a:hover {
  color: #fff;
  padding-left: 0.5rem;
  background: rgba(255, 106, 0, 0.05);
}

/* ========== 图片通用 ========== */
.page-about .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: #0B1F3A;
}

.page-about .media-frame--wide .media-frame__img {
  aspect-ratio: 8 / 5;
}

.page-about .media-frame--portrait .media-frame__img {
  aspect-ratio: 4 / 3;
}

/* ========== 桌面端增强 ========== */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, 1fr);
    max-width: none;
  }

  .page-about .about-hero__inner {
    grid-template-columns: 1.4fr 1fr;
    gap: 3rem;
  }

  .page-about .about-mission__grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .page-about .about-mission__intro {
    grid-column: 1 / 3;
  }

  .page-about .about-mission__detail {
    grid-column: 3 / 7;
  }

  .page-about .about-mission__aside {
    grid-column: 1 / 2;
  }

  .page-about .about-timeline {
    padding-left: 0;
  }

  .page-about .about-timeline::before {
    left: 70px;
  }

  .page-about .about-timeline__row {
    grid-template-columns: 140px 1fr;
    gap: 2rem;
  }

  .page-about .about-data__layout {
    grid-template-columns: 6fr 6fr;
    gap: 3rem;
  }

  .page-about .about-compliance__banner {
    grid-template-columns: 100px 1fr;
    gap: 2rem;
    align-items: start;
    padding: 2.5rem;
  }

  .page-about .about-ecosystem__grid {
    grid-template-columns: repeat(6, 1fr);
    gap: 2rem;
  }

  .page-about .about-ecosystem__copy {
    grid-column: 1 / 3;
  }

  .page-about .about-ecosystem__fig {
    grid-column: 3 / 5;
  }

  .page-about .about-ecosystem__nudge {
    grid-column: 5 / 7;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__window {
    padding: 2.5rem 3rem 3rem;
  }

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

  .page-about .about-timeline__row:nth-child(2) {
    margin-left: 2rem;
  }

  .page-about .about-timeline__row:nth-child(3) {
    margin-left: 4rem;
  }

  .page-about .about-timeline__row:nth-child(4) {
    margin-left: 6rem;
  }

  .page-about .about-timeline__row:nth-child(5) {
    margin-left: 8rem;
  }

  .page-about .about-timeline__coord {
    align-items: flex-start;
    padding-left: 14px;
  }

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

  .page-about .about-timeline__panel .panel__trigger {
    padding: 1.1rem 1.4rem;
  }

  .page-about .about-timeline__panel .panel__content-inner {
    padding: 1.4rem;
  }

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

  .page-about .about-data__list {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-data__map {
    align-self: stretch;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__main h1 {
    font-size: 3.6rem;
  }

  .page-about .about-hero__desc {
    max-width: 620px;
  }

  .page-about .about-ecosystem__grid {
    gap: 2.5rem;
  }
}