/* ===== 关于凡国 · 机构沿革档案 ===== */
.page-about .about-hero {
  border-bottom: var(--hairline);
  padding-bottom: clamp(30px, 4.6vw, 62px);
}

.page-about .about-hero .breadcrumbs {
  padding-top: clamp(16px, 2.4vw, 26px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(24px, 3.2vw, 42px);
  margin-top: clamp(20px, 3.2vw, 42px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--amber-700);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  max-width: 20ch;
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(30px, 5.6vw, 66px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink-950);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 46em;
  font-family: var(--font-body);
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.85;
  color: var(--ink-600);
}

.page-about .about-coord {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--hairline);
}

.page-about .about-coord li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 10px 0;
  border-bottom: var(--hairline);
}

.page-about .about-coord__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--slate-500);
}

.page-about .about-coord__v {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-950);
  text-align: right;
}

/* ---------- 章节通用间距 ---------- */
.page-about .about-evolution,
.page-about .about-team,
.page-about .about-maint,
.page-about .about-compare,
.page-about .about-support,
.page-about .about-eco {
  padding-block: clamp(34px, 4.8vw, 74px);
}

.page-about .about-evolution {
  border-bottom: var(--hairline);
}

.page-about .about-team {
  background: var(--white);
  border-bottom: var(--hairline);
}

.page-about .about-compare {
  background: var(--white);
  border-block: var(--hairline);
}

/* ---------- 图片位 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(26px, 3vw, 40px);
}

.page-about .about-figure--evo {
  --frame-ratio: 1200 / 420;
}

.page-about .about-figure--flow {
  --frame-ratio: 720 / 400;
  margin: clamp(26px, 3vw, 40px) 0 0;
}

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

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line-200);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 34px;
  padding-bottom: 30px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--amber-500);
  z-index: 1;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover::before {
  background: var(--amber-500);
  transform: scale(1.15);
}

.page-about .about-timeline__ver {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 8px;
  border: 1px solid var(--line-200);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-800);
  background: var(--paper-50);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink-950);
}

.page-about .about-timeline__text {
  margin: 0 0 10px;
  max-width: 52em;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-600);
}

.page-about .about-timeline__sum {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--slate-500);
}

.page-about .about-timeline__item:hover .about-timeline__title {
  color: var(--amber-700);
}

@media (min-width: 760px) {
  .page-about .about-timeline::before {
    display: none;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 0;
    padding-left: 0;
    padding-bottom: 0;
  }

  .page-about .about-timeline__item::before {
    left: 116px;
    top: 8px;
    transform: translateX(-50%);
  }

  .page-about .about-timeline__item:hover::before {
    transform: translateX(-50%) scale(1.2);
  }

  .page-about .about-timeline__side {
    padding: 4px 22px 0 0;
    text-align: right;
    border-right: 1px solid var(--line-200);
  }

  .page-about .about-timeline__body {
    padding: 0 0 34px 30px;
  }

  .page-about .about-timeline__item:last-child .about-timeline__body {
    padding-bottom: 0;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team__layout {
  display: grid;
  gap: clamp(24px, 3vw, 34px);
}

.page-about .about-team__figure {
  margin: 0;
  --frame-ratio: 760 / 420;
}

.page-about .about-team__cards {
  display: grid;
  gap: 1px;
  background: var(--line-200);
  border: var(--hairline);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-about .about-team__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: -20px -20px 16px;
  padding: 12px 20px;
  background: var(--ink-800);
  color: var(--white);
}

.page-about .about-team__role {
  margin: 0;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber-050);
}

.page-about .about-team__text {
  margin: 0 0 12px;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-600);
}

.page-about .about-team__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 7px;
}

.page-about .about-team__list li {
  position: relative;
  padding-left: 15px;
  font-family: var(--font-ui);
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-800);
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 5px;
  height: 5px;
  background: var(--celadon-600);
}

.page-about .about-ratio {
  display: flex;
  height: 8px;
  margin-top: clamp(22px, 3vw, 34px);
  border-radius: 999px;
  overflow: hidden;
  background: var(--line-200);
}

.page-about .about-ratio__seg {
  display: block;
  height: 100%;
}

.page-about .about-ratio__seg--edit {
  width: 50%;
  background: var(--ink-800);
}

.page-about .about-ratio__seg--build {
  width: 27.8%;
  background: var(--celadon-600);
}

.page-about .about-ratio__seg--ops {
  width: 22.2%;
  background: var(--amber-500);
}

@media (min-width: 900px) {
  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    align-items: start;
  }

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

/* ---------- 维护流程 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 1px;
  background: var(--line-200);
  border: var(--hairline);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-flow__card {
  background: var(--white);
  padding: 22px 20px 24px;
}

.page-about .about-flow__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-head);
  font-size: clamp(34px, 4vw, 46px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--amber-500);
}

.page-about .about-flow__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-950);
}

.page-about .about-flow__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-600);
}

@media (min-width: 720px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1060px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 四个维度 ---------- */
.page-about .about-compare__lede {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 46em;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-600);
}

.page-about .about-dims {
  display: grid;
  gap: 1px;
  background: var(--line-200);
  border: var(--hairline);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-dim {
  background: var(--white);
  padding: 20px 20px 22px;
  border-left: 2px solid var(--celadon-600);
}

.page-about .about-dim__k {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--slate-500);
}

.page-about .about-dim__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-950);
}

.page-about .about-dim__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-600);
}

.page-about .about-compare__foot {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-600);
}

.page-about .about-compare__foot a {
  color: var(--amber-700);
  text-decoration: none;
  border-bottom: 1px solid var(--amber-500);
}

@media (min-width: 760px) {
  .page-about .about-dims {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 服务响应 ---------- */
.page-about .about-support__grid {
  display: grid;
  gap: 1px;
  background: var(--line-200);
  border-block: var(--hairline);
}

.page-about .about-support__item {
  background: var(--paper-50);
  padding: 20px 0 22px;
}

.page-about .about-support__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-950);
}

.page-about .about-support__text {
  margin: 0;
  max-width: 40em;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-600);
}

.page-about .about-contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 28px;
  margin-top: clamp(22px, 3vw, 32px);
  padding: 18px 20px;
  background: var(--amber-050);
  border-left: 3px solid var(--amber-500);
  border-radius: var(--radius);
}

.page-about .about-contact__row {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-contact__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--amber-700);
}

.page-about .about-contact__v {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--ink-950);
}

.page-about .about-contact .btn {
  margin-left: auto;
}

@media (min-width: 900px) {
  .page-about .about-support__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-support__item {
    padding: 4px 26px 4px 0;
    border-right: 1px solid var(--line-200);
    background: transparent;
  }

  .page-about .about-support__item:nth-child(2) {
    padding-left: 26px;
  }

  .page-about .about-support__item:last-child {
    padding-right: 0;
    padding-left: 26px;
    border-right: 0;
  }
}

/* ---------- 合作与生态 ---------- */
.page-about .about-eco__layout {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  align-items: start;
}

.page-about .about-eco__figure {
  padding: 22px 20px;
  background: var(--ink-950);
  border-radius: var(--radius);
  text-align: left;
}

.page-about .about-eco__big {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(56px, 9vw, 92px);
  font-weight: 300;
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: var(--amber-500);
}

.page-about .about-eco__unit {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--white);
}

.page-about .about-eco__body p {
  margin: 0 0 12px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-600);
}

.page-about .about-eco__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 18px;
}

.page-about .about-eco__links a {
  font-family: var(--font-ui);
  font-size: 13.5px;
  color: var(--ink-950);
  text-decoration: none;
  border-bottom: 1px solid var(--line-200);
  padding-bottom: 2px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-eco__links a:hover {
  color: var(--amber-700);
  border-color: var(--amber-500);
}

@media (min-width: 860px) {
  .page-about .about-eco__layout {
    grid-template-columns: minmax(0, 0.5fr) minmax(0, 1.5fr);
  }
}

/* ---------- 收尾 CTA ---------- */
.page-about .about-cta {
  background: var(--ink-950);
  padding-block: clamp(34px, 4.8vw, 68px);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  align-items: center;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: clamp(23px, 3.2vw, 36px);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 44em;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--line-200);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
}

.page-about .about-cta__actions .btn--ghost {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.4);
}

.page-about .about-cta__actions .btn--ghost:hover {
  border-color: var(--amber-500);
  color: var(--amber-500);
}

@media (min-width: 900px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.85fr) minmax(0, 1fr);
    align-items: end;
  }
}

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