/* ===== 品牌中心 / about ===== */
.page-about {
  --ab-line: rgba(44, 74, 114, 0.55);
  --ab-line-soft: rgba(44, 74, 114, 0.3);
  --ab-panel: #0A1730;
  background: var(--night-900);
  color: var(--mist-200);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(32px, 6vw, 80px)) 0 clamp(36px, 5vw, 68px);
  background:
    radial-gradient(120% 90% at 84% 0%, rgba(184, 255, 61, 0.15) 0%, rgba(5, 11, 24, 0) 58%),
    linear-gradient(168deg, #050B18 0%, #0A1730 54%, #12244A 100%);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -8%;
  width: clamp(150px, 24vw, 340px);
  height: 165%;
  background: linear-gradient(180deg, rgba(184, 255, 61, 0.16), rgba(184, 255, 61, 0) 72%);
  transform: rotate(10deg);
  pointer-events: none;
}

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

.page-about .about-crumbs {
  margin-bottom: clamp(20px, 3vw, 34px);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.page-about .about-crumbs a {
  color: var(--steel-400);
  text-decoration: none;
}

.page-about .about-crumbs a:hover {
  color: var(--lime-400);
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--mist-200);
}

.page-about .about-hero-index {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--lime-400);
  text-transform: uppercase;
}

.page-about .about-hero-title {
  margin: 0;
  max-width: 1080px;
  font-size: clamp(36px, 7vw, 96px);
  font-weight: 250;
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper-050);
}

.page-about .about-hero-lede {
  margin: clamp(20px, 3vw, 32px) 0 0;
  max-width: 680px;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.85;
  color: rgba(195, 210, 230, 0.86);
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(32px, 5vw, 58px) 0 0;
  max-width: 1020px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
}

.page-about .about-fact {
  background: rgba(5, 11, 24, 0.72);
  padding: 18px clamp(14px, 2vw, 24px);
}

.page-about .about-fact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--steel-400);
}

.page-about .about-fact dd {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.3vw, 28px);
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--lime-400);
  font-variant-numeric: tabular-nums;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  padding-top: clamp(40px, 6vw, 78px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(40px, 6vw, 76px);
  min-width: 0;
}

/* ---------- 目录 ---------- */
.page-about .about-toc {
  min-width: 0;
}

.page-about .about-toc-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--steel-400);
}

.page-about .about-toc-list {
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
  border-top: 1px solid var(--ab-line);
  padding-top: 12px;
  scrollbar-width: thin;
}

.page-about .about-toc-link {
  display: inline-block;
  white-space: nowrap;
  padding-bottom: 3px;
  font-size: 13px;
  color: var(--steel-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .about-toc-link:hover,
.page-about .about-toc-link.is-active {
  color: var(--lime-400);
  border-bottom-color: var(--lime-400);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  position: relative;
  padding-top: clamp(28px, 4vw, 46px);
  min-width: 0;
}

.page-about .about-sec::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: var(--ab-line);
}

.page-about .about-sec:first-child {
  padding-top: 0;
}

.page-about .about-sec:first-child::before {
  display: none;
}

.page-about .about-sec-head {
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

.page-about .about-sec-index {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--lime-400);
}

.page-about .about-sec-title {
  margin: 0;
  max-width: 840px;
  font-size: clamp(26px, 3.6vw, 46px);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--paper-050);
}

.page-about .about-sub-title {
  margin: clamp(34px, 4vw, 52px) 0 8px;
  font-size: clamp(19px, 2vw, 24px);
  font-weight: 600;
  color: var(--paper-050);
}

.page-about .about-sub-lede {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--steel-400);
  max-width: var(--measure);
}

/* ---------- 正文 ---------- */
.page-about .about-prose p {
  margin: 0 0 18px;
  max-width: var(--measure);
  font-size: clamp(16px, 1.5vw, 17.5px);
  line-height: 1.85;
  color: var(--mist-200);
}

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

/* ---------- 图片 ---------- */
.page-about .about-figure {
  position: relative;
  margin: clamp(24px, 3.4vw, 40px) 0 0;
}

.page-about .about-figure::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 72px;
  height: 3px;
  background: var(--lime-400);
  z-index: 1;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ab-line-soft);
  background: var(--navy-800);
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel-400);
}

.page-about .about-figure--narrow img {
  max-width: 760px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  position: relative;
  margin: clamp(30px, 4vw, 50px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--ab-line);
}

.page-about .about-tl-item {
  position: relative;
  padding: 0 0 clamp(24px, 3.4vw, 38px) 32px;
}

.page-about .about-tl-item:last-child {
  padding-bottom: 0;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  background: var(--night-900);
  border: 1px solid var(--lime-400);
}

.page-about .about-tl-item:last-child::before {
  background: var(--lime-400);
}

.page-about .about-tl-year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--lime-400);
}

.page-about .about-tl-title {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 600;
  color: var(--paper-050);
}

.page-about .about-tl-text {
  margin: 0;
  max-width: var(--measure);
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist-200);
}

/* ---------- 流程步骤 ---------- */
.page-about .about-steps {
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 6px;
  padding: 22px 0;
  border-top: 1px solid var(--ab-line-soft);
}

.page-about .about-step:first-child {
  border-top-color: var(--lime-600);
}

.page-about .about-step-no {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--lime-400);
}

.page-about .about-step-title {
  grid-column: 2;
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--paper-050);
}

.page-about .about-step-text {
  grid-column: 2;
  margin: 0;
  max-width: var(--measure);
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist-200);
}

/* ---------- 团队环形图 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
  align-items: center;
  margin-top: clamp(26px, 3.4vw, 42px);
}

.page-about .about-donut {
  position: relative;
  width: min(250px, 68vw);
  margin: 0 auto;
}

.page-about .about-donut svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-donut-center {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  pointer-events: none;
}

.page-about .about-donut-center strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 500;
  line-height: 1;
  color: var(--paper-050);
  font-variant-numeric: tabular-nums;
}

.page-about .about-donut-center span {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--steel-400);
}

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

.page-about .about-legend li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--navy-800);
  font-size: 15px;
  color: var(--mist-200);
}

.page-about .about-legend i {
  flex: none;
  width: 10px;
  height: 10px;
}

.page-about .about-legend b {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 500;
  color: var(--paper-050);
  font-variant-numeric: tabular-nums;
}

/* ---------- 角色列表 ---------- */
.page-about .about-roles {
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--ab-line-soft);
}

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

.page-about .about-role-no {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime-400);
}

.page-about .about-role h4 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--paper-050);
}

.page-about .about-role p {
  margin: 0;
  max-width: var(--measure);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist-200);
}

/* ---------- 数字带 ---------- */
.page-about .about-strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(26px, 3.4vw, 42px) 0 0;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
}

.page-about .about-strip-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 22px;
  background: var(--navy-800);
}

.page-about .about-strip-num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime-400);
  font-variant-numeric: tabular-nums;
}

.page-about .about-strip-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel-400);
}

/* ---------- 选择理由 ---------- */
.page-about .about-why {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-why li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-top: 1px solid var(--ab-line-soft);
}

.page-about .about-why li:first-child {
  border-top-color: var(--lime-600);
}

.page-about .about-why-num {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime-400);
}

.page-about .about-why h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--paper-050);
}

.page-about .about-why p {
  margin: 0;
  max-width: var(--measure);
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist-200);
}

/* ---------- 后续入口 ---------- */
.page-about .about-next {
  margin-top: clamp(34px, 4.4vw, 56px);
  padding-top: clamp(24px, 3vw, 36px);
  border-top: 1px solid var(--ab-line);
}

.page-about .about-next-lede {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--steel-400);
}

.page-about .about-next-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
}

.page-about .about-next-list a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--navy-800);
  color: var(--paper-050);
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.24s var(--ease), color 0.24s var(--ease);
}

.page-about .about-next-list a:hover,
.page-about .about-next-list a:focus-visible {
  background: var(--navy-700);
  color: var(--lime-400);
}

.page-about .about-next-list span {
  font-size: 13px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--steel-400);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-step {
    grid-template-columns: 56px minmax(0, 1fr);
    column-gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: 250px minmax(0, 1fr);
  }
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: 190px minmax(0, 1fr);
    column-gap: clamp(40px, 6vw, 88px);
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .about-toc-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 14px 0 0;
    border-top: 1px solid var(--ab-line);
  }

  .page-about .about-toc-link {
    display: block;
    padding: 7px 0 7px 12px;
    border-bottom: 0;
    border-left: 1px solid var(--ab-line-soft);
  }

  .page-about .about-toc-link:hover,
  .page-about .about-toc-link.is-active {
    border-bottom-color: transparent;
    border-left-color: var(--lime-400);
  }
}

@media (min-width: 1280px) {
  .page-about .about-sec-title {
    max-width: 900px;
  }
}

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