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

.page-about .crumb {
  margin: 24px 0 0;
  font-size: 14px;
}

/* ---------- 首屏 ---------- */
.page-about .about-lead {
  display: grid;
  gap: 32px;
  padding: 28px 0 48px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-lead__kicker {
  margin: 0 0 16px;
  font-family: var(--cond);
  font-size: 14px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about h1 {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(32px, 7vw, 62px);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.page-about .about-lead__intro {
  max-width: 58ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--paper);
  opacity: 0.84;
}

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

.page-about .about-lead__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--panel);
}

.page-about .about-fact__num {
  font-family: var(--mono);
  font-size: 24px;
  color: var(--amber);
  line-height: 1.1;
}

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

/* ---------- 分栏骨架 ---------- */
.page-about .about-layout {
  padding: 32px 0 0;
}

.page-about .about-aside {
  margin-bottom: 8px;
}

/* ---------- 时间轴目录 ---------- */
.page-about .about-timeline {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel);
}

.page-about .about-timeline__title {
  margin: 0 0 14px;
  font-family: var(--cond);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-timeline ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-timeline a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-timeline a:hover {
  color: var(--paper);
  border-color: var(--amber);
}

.page-about .about-timeline__year {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--amber);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding: 44px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section:last-of-type {
  border-bottom: 0;
  padding-bottom: 72px;
}

.page-about .about-section .section-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin: 0 0 22px;
}

.page-about .about-section .section-head__num {
  font-family: var(--serif);
  font-size: clamp(26px, 5vw, 40px);
  line-height: 1;
  color: var(--amber);
}

.page-about .about-section .section-head__title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.3;
}

.page-about .prose {
  max-width: 720px;
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--paper);
  opacity: 0.84;
}

/* ---------- 图片 ---------- */
.page-about .figure {
  margin: 24px 0 0;
}

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

/* ---------- 沿革 ---------- */
.page-about .about-roadmap {
  display: grid;
  gap: 28px;
}

.page-about .mile {
  list-style: none;
  position: relative;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .mile::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--line);
}

.page-about .mile__item {
  position: relative;
  padding: 0 0 24px 26px;
}

.page-about .mile__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
}

.page-about .mile__year {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .mile__item h3 {
  margin: 6px 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.45;
}

.page-about .mile__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 团队分工 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-col {
  padding: 20px 18px;
  background: var(--panel);
}

.page-about .team-col__name {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--cond);
  font-size: 17px;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.page-about .team-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .team-col li {
  position: relative;
  padding-left: 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .team-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--celadon);
}

/* ---------- 服务入口 ---------- */
.page-about .svc {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .svc__item {
  border-bottom: 1px solid var(--line);
}

.page-about .svc__row {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 20px;
  gap: 12px;
  align-items: start;
  padding: 16px 0 16px 10px;
  border-left: 3px solid transparent;
  cursor: pointer;
  list-style: none;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .svc__row::-webkit-details-marker {
  display: none;
}

.page-about .svc__row:hover,
.page-about .svc__details[open] .svc__row {
  border-left-color: var(--amber);
  background: rgba(18, 38, 58, 0.66);
}

.page-about .svc__num {
  padding-top: 4px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--amber);
}

.page-about .svc__main {
  display: block;
  min-width: 0;
}

.page-about .svc__name {
  display: block;
  margin-bottom: 7px;
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .svc__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .svc__hint {
  font-family: var(--cond);
  font-size: 20px;
  line-height: 1;
  color: var(--muted);
  transition: transform var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .svc__details[open] .svc__hint {
  transform: rotate(45deg);
  color: var(--amber);
}

.page-about .svc__panel {
  padding: 0 0 22px 46px;
}

.page-about .svc__panel p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .svc__label {
  display: inline-block;
  margin-right: 8px;
  padding-bottom: 1px;
  border-bottom: 1px solid var(--line);
  font-family: var(--cond);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

/* ---------- 认证 ---------- */
.page-about .cert-svg {
  display: block;
  width: 100%;
  max-width: 520px;
  height: auto;
  margin: 10px 0 26px;
}

.page-about .cert-levels {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .cert-level {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  padding: 20px 18px;
  background: var(--panel);
}

.page-about .cert-level--deep {
  background: linear-gradient(160deg, #1A2B3E, var(--panel));
  border-left: 2px solid var(--amber);
}

.page-about .cert-level__name {
  margin: 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 20px;
  color: var(--paper);
}

.page-about .cert-level__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .cert-level__perm {
  margin: 6px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.8;
  color: var(--celadon);
}

/* ---------- 生态 ---------- */
.page-about .flow {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .flow li {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel);
}

.page-about .flow__step {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

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

.page-about .flow p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 22px 0 0;
  font-size: 14px;
}

.page-about .about-links a {
  color: var(--muted);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--line);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-links a:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ---------- 承诺 ---------- */
.page-about .promise {
  margin-top: 22px;
  padding: 26px 20px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: linear-gradient(160deg, var(--panel), var(--ink-deep));
}

.page-about .promise ul {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .promise li {
  display: grid;
  gap: 6px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-about .promise__key {
  font-family: var(--cond);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-about .about-email-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  align-items: center;
  margin-top: 22px;
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-email {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--paper);
  word-break: break-all;
}

.page-about .copy-btn {
  cursor: pointer;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .promise li {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 14px;
  }

  .page-about .svc__panel {
    padding-left: 56px;
  }
}

@media (min-width: 900px) {
  .page-about .about-lead {
    grid-template-columns: 1.45fr 0.9fr;
    align-items: end;
    gap: 64px;
    padding: 48px 0 56px;
  }

  .page-about .about-layout {
    display: grid;
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    padding-top: 40px;
  }

  .page-about .about-aside {
    position: sticky;
    top: 88px;
    margin-bottom: 0;
  }

  .page-about .about-timeline ol {
    display: block;
    position: relative;
    padding-left: 18px;
  }

  .page-about .about-timeline ol::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 12px;
    bottom: 12px;
    width: 1px;
    background: var(--line);
  }

  .page-about .about-timeline li {
    position: relative;
    margin-bottom: 2px;
  }

  .page-about .about-timeline li::before {
    content: "";
    position: absolute;
    left: -18px;
    top: 15px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--line);
    transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  }

  .page-about .about-timeline li:has(a[aria-current="true"])::before {
    background: var(--amber);
    box-shadow: 0 0 0 3px rgba(229, 161, 60, 0.16);
  }

  .page-about .about-timeline a {
    padding: 6px 0;
    border: 0;
    border-radius: 0;
    gap: 10px;
    font-size: 14px;
  }

  .page-about .about-timeline a:hover {
    border: 0;
  }

  .page-about .about-timeline a[aria-current="true"] {
    color: var(--amber);
  }

  .page-about .about-section {
    padding: 52px 0;
  }
}

@media (min-width: 1000px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .about-roadmap {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-roadmap .figure {
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .svc__hint,
  .page-about .svc__row,
  .page-about .about-timeline a,
  .page-about .about-timeline li::before {
    transition: none;
  }
}