/* ==========================================================================
   page-about — 品牌自述
   编号章节体系：左侧竖排索引轨道 + 右侧顺读正文
   ========================================================================== */

.page-about {
  --rail-w: 76px;
  --col-gap: 48px;
  --card-accent: var(--lime);
  display: block;
}

/* ---------------------------------------------------------------
   面包屑
   --------------------------------------------------------------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-top: 26px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.page-about .breadcrumb__link {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .breadcrumb__sep {
  color: var(--line);
}

.page-about .breadcrumb__now {
  color: var(--text);
}

/* ---------------------------------------------------------------
   首屏
   --------------------------------------------------------------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 52px) 0 clamp(44px, 7vw, 80px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -14%;
  width: min(680px, 78vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(198, 255, 61, 0.13), transparent 62%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  align-items: end;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.68fr);
    gap: 56px;
  }
}

.page-about .about-hero__lead {
  max-width: 36em;
  margin: 20px 0 0;
  font-size: 1.0625rem;
  line-height: 1.82;
  color: var(--muted);
}

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

/* 首屏战术板视觉 */
.page-about .about-hero__board {
  position: relative;
  aspect-ratio: 5 / 4;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(circle at 28% 18%, rgba(198, 255, 61, 0.18), transparent 55%),
    linear-gradient(155deg, var(--elevated) 0%, var(--ink) 100%);
  overflow: hidden;
  isolation: isolate;
}

.page-about .about-hero__pitch {
  position: absolute;
  inset: 11% 13%;
  border: 2px solid rgba(198, 255, 61, 0.26);
  border-radius: 44% 56% 52% 48% / 52% 44% 56% 48%;
}

.page-about .about-hero__scan {
  position: absolute;
  left: 50%;
  top: 8%;
  bottom: 8%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, transparent, rgba(63, 210, 199, 0.6) 45%, rgba(63, 210, 199, 0.6) 55%, transparent);
}

.page-about .about-hero__blip {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--flame);
  box-shadow: 0 0 0 6px rgba(255, 90, 43, 0.14);
}

.page-about .about-hero__blip--a {
  left: 26%;
  top: 62%;
}

.page-about .about-hero__blip--b {
  right: 22%;
  top: 28%;
  background: var(--lime);
  box-shadow: 0 0 0 6px rgba(198, 255, 61, 0.14);
}

/* 数据条 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(34px, 6vw, 60px) 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stats__item {
  padding: 20px 22px 22px;
  background: var(--panel);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2.125rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--lime);
}

.page-about .about-stats__label {
  margin: 8px 0 0;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------------------------------------------------------------
   章节主体外壳 + 索引轨道
   --------------------------------------------------------------- */
.page-about .about-shell {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

@media (min-width: 980px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    column-gap: var(--col-gap);
  }
}

.page-about .about-rail {
  display: none;
}

.page-about .about-rail__link {
  position: relative;
  display: block;
  padding: 4px 0 4px 18px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.24s var(--ease);
}

.page-about .about-rail__link::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 0;
  transform: translateY(-50%);
  background: var(--lime);
  transition: height 0.26s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--text);
}

.page-about .about-rail__link.is-active,
.page-about .about-rail__link[aria-current="true"] {
  color: var(--lime);
}

.page-about .about-rail__link.is-active::after,
.page-about .about-rail__link[aria-current="true"]::after {
  height: 100%;
}

@media (min-width: 980px) {
  .page-about .about-rail {
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: sticky;
    top: 150px;
    align-self: start;
  }

  .page-about .about-rail::before {
    content: "";
    position: absolute;
    left: 0;
    top: 6px;
    bottom: 6px;
    width: 2px;
    background: var(--line);
  }
}

/* ---------------------------------------------------------------
   章节头部与通用正文
   --------------------------------------------------------------- */
.page-about .about-chapter {
  padding: clamp(46px, 7vw, 84px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 148px;
}

.page-about .about-chapter:first-child {
  border-top: 0;
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px 16px;
  align-items: start;
  margin-bottom: 22px;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4.4vw, 2.75rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .about-chapter__title {
  margin: 4px 0 0;
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-chapter__intro {
  max-width: 36em;
  margin: 0 0 30px;
  font-size: 1.0625rem;
  line-height: 1.82;
  color: var(--muted);
}

/* ---------------------------------------------------------------
   01 时间轴
   --------------------------------------------------------------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--line);
}

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

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(198, 255, 61, 0.14);
}

.page-about .about-timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-timeline__title {
  margin: 8px 0 8px;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.42;
  color: var(--text);
}

.page-about .about-timeline__node p:not(.about-timeline__year) {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--muted);
}

@media (min-width: 800px) {
  .page-about .about-timeline {
    padding: 52px 0 0;
    grid-template-columns: 1fr 1.16fr 1.44fr;
    gap: 0;
  }

  .page-about .about-timeline::before {
    left: 0;
    right: 0;
    top: 24px;
    bottom: auto;
    width: auto;
    height: 2px;
  }

  .page-about .about-timeline__node {
    padding-right: 28px;
  }

  .page-about .about-timeline__node::before {
    left: 0;
    top: -30px;
  }
}

/* 01 章节下半部分：说明 + 图 */
.page-about .about-stage__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 42px;
}

@media (min-width: 860px) {
  .page-about .about-stage__split {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: 46px;
    align-items: center;
  }
}

.page-about .about-stage__aside {
  border-left: 2px solid var(--line);
  padding-left: 22px;
}

.page-about .about-stage__aside p {
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--muted);
}

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

/* ---------------------------------------------------------------
   02 团队三列（第三列下沉）
   --------------------------------------------------------------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-team__card {
  position: relative;
  padding: 24px 22px 26px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--card-accent);
  border-radius: var(--r-md);
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-team__card:nth-child(1) {
  --card-accent: var(--lime);
}

.page-about .about-team__card:nth-child(2) {
  --card-accent: var(--cyan);
}

.page-about .about-team__card:nth-child(3) {
  --card-accent: var(--lime);
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  background: var(--elevated);
}

@media (min-width: 840px) {
  .page-about .about-team {
    grid-template-columns: 1.1fr 0.92fr 1.02fr;
    gap: 20px;
    align-items: start;
    padding-bottom: 74px;
  }

  .page-about .about-team__card:nth-child(2) {
    transform: translateY(26px);
  }

  .page-about .about-team__card:nth-child(3) {
    transform: translateY(54px);
  }
}

.page-about .about-team__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  color: var(--card-accent);
}

.page-about .about-team__title {
  margin: 12px 0 10px;
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-team__scope {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------------------------------------------------------------
   03 四道关流程
   --------------------------------------------------------------- */
.page-about .about-flow {
  display: grid;
  gap: 28px;
}

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

.page-about .about-flow__svg {
  display: block;
  width: 100%;
  height: auto;
  min-height: 130px;
  overflow: visible;
}

.page-about .about-flow__line {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 9 9;
  opacity: 0.75;
}

.page-about .about-flow__dot {
  fill: var(--ink);
  stroke-width: 3;
}

.page-about .about-flow__dot--a,
.page-about .about-flow__dot--b,
.page-about .about-flow__dot--c {
  stroke: var(--lime);
}

.page-about .about-flow__dot--d {
  stroke: var(--flame);
}

.page-about .about-flow__steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 780px) {
  .page-about .about-flow__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    align-items: start;
  }

  .page-about .about-flow__step:nth-child(1) {
    margin-top: 0;
  }

  .page-about .about-flow__step:nth-child(2) {
    margin-top: 28px;
  }

  .page-about .about-flow__step:nth-child(3) {
    margin-top: 8px;
  }

  .page-about .about-flow__step:nth-child(4) {
    margin-top: 36px;
  }
}

.page-about .about-flow__step {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition: border-color 0.26s var(--ease), background 0.26s var(--ease);
}

.page-about .about-flow__step:hover,
.page-about .about-flow__step:focus-within {
  border-color: var(--lime);
  background: var(--elevated);
}

.page-about .about-flow__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-flow__step h3 {
  margin: 10px 0 8px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-flow__body {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-flow__note {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--cyan);
}

@media (min-width: 780px) {
  .page-about .about-flow__note {
    max-height: 0;
    margin: 0;
    padding-top: 0;
    border-top-color: transparent;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.34s var(--ease), opacity 0.3s var(--ease), margin 0.34s var(--ease), padding 0.34s var(--ease), border-color 0.3s var(--ease);
  }

  .page-about .about-flow__step:hover .about-flow__note,
  .page-about .about-flow__step:focus-within .about-flow__note {
    max-height: 200px;
    margin: 12px 0 0;
    padding-top: 10px;
    border-top-color: var(--line);
    opacity: 1;
  }
}

.page-about .about-flow__media {
  margin: 0;
}

/* ---------------------------------------------------------------
   04 更新日时间表
   --------------------------------------------------------------- */
.page-about .about-cadence {
  list-style: none;
  margin: 0 0 30px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-cadence__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 720px) {
  .page-about .about-cadence__row {
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 30px;
    align-items: baseline;
  }
}

.page-about .about-cadence__time {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-about .about-cadence__title {
  margin: 0 0 6px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-cadence__text {
  max-width: 40em;
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.76;
  color: var(--muted);
}

.page-about .about-cadence__notes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 760px) {
  .page-about .about-cadence__notes {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 22px;
  }
}

.page-about .about-cadence__panel {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel);
}

.page-about .about-cadence__panel--alert {
  border-color: rgba(255, 90, 43, 0.42);
  background: linear-gradient(160deg, rgba(255, 90, 43, 0.09), transparent 72%), var(--panel);
}

.page-about .about-cadence__panel-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--flame);
}

.page-about .about-cadence__panel-text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------------------------------------------------------------
   05 内容伙伴
   --------------------------------------------------------------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

@media (min-width: 880px) {
  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    gap: 48px;
    align-items: center;
  }
}

.page-about .about-partners__media {
  margin: 0;
}

.page-about .about-partners__para {
  max-width: 34em;
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--muted);
}

.page-about .about-partners__para:first-child {
  color: var(--text);
}

.page-about .about-partners__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------------------------------------------------------------
   06 三条好处 + 下一步
   --------------------------------------------------------------- */
.page-about .about-value {
  list-style: none;
  margin: 0 0 42px;
  padding: 0;
}

.page-about .about-value__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px 18px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-value__item:first-child {
  border-top: 1px solid var(--line);
}

@media (min-width: 800px) {
  .page-about .about-value__item:nth-child(2) {
    padding-left: 52px;
  }

  .page-about .about-value__item:nth-child(3) {
    padding-left: 104px;
  }
}

.page-about .about-value__idx {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--lime);
  padding-top: 4px;
}

.page-about .about-value__title {
  margin: 0 0 10px;
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.42;
  color: var(--text);
}

.page-about .about-value__text {
  max-width: 40em;
  margin: 0 0 12px;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-value__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 61, 0.4);
  transition: border-color 0.22s var(--ease), color 0.22s var(--ease);
}

.page-about .about-value__link:hover,
.page-about .about-value__link:focus-visible {
  color: var(--text);
  border-bottom-color: var(--text);
}

.page-about .about-next {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  padding: 28px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, rgba(198, 255, 61, 0.1), transparent 68%), var(--panel);
}

@media (min-width: 720px) {
  .page-about .about-next {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 28px;
    align-items: center;
    padding: 30px 34px;
  }
}

.page-about .about-next__title {
  margin: 0 0 8px;
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.36;
  color: var(--text);
}

.page-about .about-next__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.76;
  color: var(--muted);
}

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

/* ---------------------------------------------------------------
   媒体元素兜底
   --------------------------------------------------------------- */
.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-md);
  object-fit: cover;
}

.page-about .media__caption {
  margin-top: 10px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------------------------------------------------------------
   动效降级
   --------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link::after,
  .page-about .about-flow__note,
  .page-about .about-team__card,
  .page-about .about-flow__step {
    transition: none !important;
  }
}