.page-about {
  --about-text: rgba(243, 233, 210, 0.82);
  --about-dim: #9AA6C4;
  --about-rule: rgba(30, 43, 82, 0.85);
  --about-glass: rgba(16, 26, 58, 0.62);
  background: var(--ink);
  color: var(--about-text);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 18px 0 52px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 80% at 88% 0%, rgba(78, 216, 208, 0.1), transparent 62%),
    linear-gradient(180deg, rgba(16, 26, 58, 0.9), rgba(7, 14, 36, 1));
}

.page-about .about-hero__plate {
  position: absolute;
  z-index: -1;
  top: -32%;
  right: -18%;
  width: min(680px, 84vw);
  height: 172%;
  background: linear-gradient(158deg, rgba(255, 107, 44, 0.95), rgba(255, 107, 44, 0) 70%);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 66%);
  opacity: 0.3;
  pointer-events: none;
}

.page-about .about-hero__edge {
  position: absolute;
  z-index: -1;
  top: 18%;
  right: -8%;
  width: min(560px, 68vw);
  height: 2px;
  background: linear-gradient(90deg, rgba(255, 107, 44, 0) 0%, var(--orange) 72%, rgba(255, 107, 44, 0) 100%);
  transform: rotate(-28deg);
  opacity: 0.5;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero__eyebrow {
  margin: 22px 0 0;
  color: var(--orange);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(32px, 8vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: rgba(7, 14, 36, 0.88);
}

.page-about .about-hero__fact-value {
  font-size: clamp(26px, 6vw, 36px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--orange);
}

.page-about .about-hero__fact:nth-child(2) .about-hero__fact-value {
  color: var(--lime);
}

.page-about .about-hero__fact:nth-child(3) .about-hero__fact-value {
  color: var(--cyan);
}

.page-about .about-hero__fact-label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--silver);
}

/* ---------- 章节骨架 ---------- */

.page-about .chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding-top: 52px;
  padding-bottom: 52px;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .chapter--last {
  border-bottom: 0;
}

.page-about .chapter__rail {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  gap: 14px;
}

.page-about .chapter__index {
  font-size: 28px;
  line-height: 1;
  font-weight: 700;
  color: rgba(154, 166, 196, 0.45);
  transition: color 320ms var(--ease);
}

.page-about .chapter.is-current .chapter__index {
  color: var(--orange);
}

.page-about .chapter__annotation {
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--silver);
  opacity: 0.85;
}

.page-about .section-head {
  margin-bottom: 18px;
}

.page-about .section-kicker {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--orange);
}

.page-about .section-title {
  margin: 0;
  font-size: clamp(23px, 5vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .prose p {
  margin: 0 0 1.05em;
  font-size: 16.5px;
  line-height: 1.8;
  max-width: 68ch;
  color: var(--about-text);
}

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

.page-about .about-strong {
  color: var(--paper);
  font-weight: 600;
}

.page-about .about-lede {
  margin: 0 0 20px;
  font-size: 16.5px;
  line-height: 1.8;
  max-width: 62ch;
  color: var(--about-dim);
}

/* ---------- 图表通用 ---------- */

.page-about .about-figure {
  margin: 28px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-2);
}

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

.page-about .about-figure .figure-caption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver);
  border-top: 1px solid var(--line);
}

/* ---------- 三阶段标签 ---------- */

.page-about .stage-tabs {
  margin-top: 6px;
}

.page-about .stage-tabs__rail {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
  scroll-snap-type: x proximity;
}

.page-about .stage-node {
  flex: 0 0 auto;
  min-width: 168px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: flex-start;
  padding: 16px;
  font-family: inherit;
  text-align: left;
  color: var(--silver);
  background: var(--about-glass);
  border: 1px solid var(--line);
  border-radius: 14px;
  cursor: pointer;
  scroll-snap-align: start;
  transition: border-color 240ms var(--ease), background 240ms var(--ease), color 240ms var(--ease);
}

.page-about .stage-node:hover {
  border-color: rgba(255, 107, 44, 0.6);
}

.page-about .stage-node[aria-selected="true"] {
  border-color: var(--orange);
  background: rgba(255, 107, 44, 0.12);
  color: var(--paper);
}

.page-about .stage-node__num {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .stage-node__name {
  font-size: 16px;
  font-weight: 700;
  color: inherit;
}

.page-about .stage-node__state {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--lime);
}

.page-about .stage-tabs__panels {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.page-about .stage-panel {
  padding: 22px;
  max-width: 74ch;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--about-glass);
  backdrop-filter: blur(8px);
}

.page-about .stage-panel__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .stage-panel p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .stage-panel__link {
  margin-top: 14px;
}

.page-about .stage-panel__link .ghost-link {
  font-size: 14px;
}

/* ---------- 团队构成 ---------- */

.page-about .team-figure {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: center;
  margin-top: 8px;
}

.page-about .team-ring {
  position: relative;
  width: min(280px, 76vw);
  aspect-ratio: 1 / 1;
  margin: 0 auto;
}

.page-about .team-ring__svg {
  display: block;
  width: 100%;
  height: 100%;
}

.page-about .team-arc {
  fill: none;
  stroke-width: 22;
  stroke-linecap: butt;
  transition: stroke-width 260ms var(--ease), opacity 260ms var(--ease), filter 260ms var(--ease);
}

.page-about .team-arc--edit {
  stroke: var(--orange);
  stroke-dasharray: 174.1 439.82;
  stroke-dashoffset: 0;
}

.page-about .team-arc--product {
  stroke: var(--lime);
  stroke-dasharray: 123.7 439.82;
  stroke-dashoffset: -174.1;
}

.page-about .team-arc--tech {
  stroke: var(--cyan);
  stroke-dasharray: 96.2 439.82;
  stroke-dashoffset: -297.8;
}

.page-about .team-arc--support {
  stroke: var(--amber);
  stroke-dasharray: 45.8 439.82;
  stroke-dashoffset: -394;
}

.page-about .team-ring__core {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  pointer-events: none;
}

.page-about .team-ring__num {
  font-size: 40px;
  line-height: 1;
  font-weight: 800;
  color: var(--paper);
}

.page-about .team-ring__unit {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--silver);
}

.page-about .team-legend {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  overflow: hidden;
}

.page-about .team-legend__item {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  grid-template-areas:
    "swatch name count"
    "swatch desc desc";
  gap: 4px 12px;
  padding: 15px 16px;
  background: var(--ink-2);
  transition: background 220ms var(--ease);
}

.page-about .team-legend__item:hover {
  background: #16224a;
}

.page-about .team-legend__swatch {
  grid-area: swatch;
  width: 10px;
  height: 10px;
  margin-top: 5px;
  border-radius: 3px;
  background: var(--silver);
}

.page-about .team-legend__item--edit .team-legend__swatch {
  background: var(--orange);
}

.page-about .team-legend__item--product .team-legend__swatch {
  background: var(--lime);
}

.page-about .team-legend__item--tech .team-legend__swatch {
  background: var(--cyan);
}

.page-about .team-legend__item--support .team-legend__swatch {
  background: var(--amber);
}

.page-about .team-legend__name {
  grid-area: name;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .team-legend__count {
  grid-area: count;
  font-size: 20px;
  line-height: 1;
  font-weight: 700;
  color: var(--paper);
}

.page-about .team-legend__desc {
  grid-area: desc;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--silver);
}

.page-about .team-figure:has(.team-legend__item:hover) .team-arc {
  opacity: 0.3;
}

.page-about .team-figure:has(.team-legend__item--edit:hover) .team-arc--edit {
  opacity: 1;
  stroke-width: 28;
  filter: drop-shadow(0 0 8px rgba(255, 107, 44, 0.65));
}

.page-about .team-figure:has(.team-legend__item--product:hover) .team-arc--product {
  opacity: 1;
  stroke-width: 28;
  filter: drop-shadow(0 0 8px rgba(163, 245, 60, 0.6));
}

.page-about .team-figure:has(.team-legend__item--tech:hover) .team-arc--tech {
  opacity: 1;
  stroke-width: 28;
  filter: drop-shadow(0 0 8px rgba(78, 216, 208, 0.6));
}

.page-about .team-figure:has(.team-legend__item--support:hover) .team-arc--support {
  opacity: 1;
  stroke-width: 28;
  filter: drop-shadow(0 0 8px rgba(255, 194, 75, 0.6));
}

/* ---------- 内容与数据能力 ---------- */

.page-about .capability {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 6px;
}

.page-about .capability__figure {
  margin-top: 0;
}

.page-about .capability__list {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .capability__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding-bottom: 18px;
  border-bottom: 1px dashed var(--about-rule);
}

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

.page-about .capability__num {
  font-size: clamp(22px, 5vw, 28px);
  line-height: 1;
  font-weight: 700;
  color: var(--lime);
}

.page-about .capability__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--about-text);
}

.page-about .capability__note {
  margin: 26px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--about-dim);
}

.page-about .source-list {
  display: grid;
  gap: 10px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .source-list__item {
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--silver);
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(16, 26, 58, 0.55);
}

.page-about .source-list__item strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  color: var(--paper);
}

/* ---------- 服务区域 ---------- */

.page-about .region {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 6px;
}

.page-about .region__stats {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  overflow: hidden;
}

.page-about .region__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-2);
}

.page-about .region__stat-value {
  font-size: clamp(19px, 4vw, 23px);
  line-height: 1.2;
  font-weight: 700;
  color: var(--paper);
}

.page-about .region__stat:nth-child(4) .region__stat-value {
  color: var(--cyan);
}

.page-about .region__stat-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--silver);
}

.page-about .about-figure--band img {
  aspect-ratio: 14 / 5;
  object-fit: cover;
}

/* ---------- 合作生态 ---------- */

.page-about .partner-tabs {
  margin-top: 4px;
}

.page-about .partner-tabs__filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .partner-chip {
  appearance: none;
  padding: 9px 20px;
  font-family: inherit;
  font-size: 14px;
  color: var(--silver);
  background: rgba(16, 26, 58, 0.6);
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  transition: color 240ms var(--ease), background 240ms var(--ease), border-color 240ms var(--ease);
}

.page-about .partner-chip:hover {
  border-color: rgba(163, 245, 60, 0.6);
  color: var(--paper);
}

.page-about .partner-chip[aria-selected="true"] {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
  font-weight: 700;
}

.page-about .partner-tabs__panels {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.page-about .partner-panel {
  padding: 22px;
  max-width: 76ch;
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  border-radius: 4px var(--radius) var(--radius) 4px;
  background: var(--about-glass);
}

.page-about .partner-panel__title {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .partner-panel__list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 20px;
}

.page-about .partner-panel__item {
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--about-text);
}

.page-about .report-note {
  display: grid;
  gap: 12px;
  margin-top: 28px;
  padding: 22px;
  border: 1px dashed rgba(255, 194, 75, 0.5);
  border-radius: var(--radius);
  background: rgba(255, 194, 75, 0.06);
}

.page-about .report-note__tag {
  justify-self: start;
}

.page-about .report-note__text {
  margin: 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .report-note__link {
  font-size: 14px;
}

/* ---------- 结尾通道 ---------- */

.page-about .about-cta {
  margin-top: 8px;
  padding: 52px 0 64px;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(110% 90% at 12% 0%, rgba(255, 107, 44, 0.14), transparent 62%),
    linear-gradient(180deg, rgba(16, 26, 58, 0.6), rgba(7, 14, 36, 1));
}

.page-about .about-cta__inner {
  position: relative;
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  max-width: 48ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .source-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .team-figure {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 44px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 26px 0 72px;
  }

  .page-about .about-hero__eyebrow {
    margin-top: 30px;
  }

  .page-about .chapter {
    grid-template-columns: 96px minmax(0, 1fr);
    column-gap: 56px;
    padding-top: 76px;
    padding-bottom: 76px;
  }

  .page-about .chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    position: sticky;
    top: 116px;
    align-self: start;
  }

  .page-about .chapter__index {
    font-size: 40px;
  }

  .page-about .chapter__annotation {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.3em;
  }

  .page-about .stage-tabs__rail {
    overflow: visible;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .stage-node {
    min-width: 0;
  }

  .page-about .capability {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 44px;
    align-items: start;
    margin-top: 10px;
  }

  .page-about .region {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: 48px;
    align-items: start;
    margin-top: 10px;
  }

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

  .page-about .prose p {
    font-size: 17px;
  }

  .page-about .about-cta {
    padding: 72px 0 84px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__lead {
    font-size: 17.5px;
  }

  .page-about .source-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-arc,
  .page-about .stage-node,
  .page-about .partner-chip,
  .page-about .chapter__index {
    transition: none;
  }
}