.page-about {
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding-top: 20px;
  padding-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gray);
}

.page-about .crumbs a {
  color: var(--cyan-2);
  text-decoration: none;
}

.page-about .crumbs a:hover {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--cream);
  padding: 6px 0 46px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, var(--ink-2) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, var(--ink-2) 0 1px, transparent 1px 72px);
  opacity: 0.5;
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
}

.page-about .about-hero .eyebrow {
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 14px 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7.2vw, 70px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .about-lead {
  max-width: 60ch;
  margin: 0 0 24px;
  font-size: 17px;
  line-height: 1.9;
  color: var(--paper-2);
}

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

.page-about .about-hero .btn--ghost {
  border-color: var(--paper-2);
  color: var(--cream);
}

.page-about .about-index {
  align-self: start;
  background: var(--ink-2);
  padding: 20px 20px 12px;
  clip-path: var(--cut-lg);
}

.page-about .index-title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-index .index-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-index .index-row a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid rgba(240, 230, 210, 0.14);
  color: var(--cream);
  font-size: 15px;
  text-decoration: none;
  transition: color 180ms var(--ease);
}

.page-about .about-index .index-row:last-child a {
  border-bottom: 0;
}

.page-about .about-index .index-row a:hover {
  color: var(--cyan);
}

.page-about .about-index .num {
  color: var(--accent);
}

/* ---------- 通用区块 ---------- */

.page-about .about-section {
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-about .about-sec-head {
  max-width: 68ch;
  margin-bottom: 26px;
}

.page-about .about-sec-head h2 {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 44px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--text);
}

.page-about .about-sec-head p {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--gray);
}

.page-about .about-decisions .about-sec-head h2,
.page-about .about-next .about-sec-head h2 {
  color: var(--cream);
}

.page-about .about-decisions .about-sec-head p,
.page-about .about-next .about-sec-head p {
  color: var(--paper-2);
}

.page-about .about-decisions .section-label,
.page-about .about-next .section-label {
  color: var(--cyan);
}

/* ---------- 图片 ---------- */

.page-about .about-shot {
  margin: 0 0 28px;
}

.page-about .about-shot img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  clip-path: var(--cut-lg);
  border: 1px solid var(--paper-2);
}

.page-about .about-shot-cap {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--gray);
}

.page-about .about-shot--wide img {
  border-color: rgba(240, 230, 210, 0.2);
}

.page-about .about-shot--wide .about-shot-cap {
  color: var(--paper-2);
}

/* ---------- 筛选条 ---------- */

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 30px;
}

.page-about .chip {
  padding: 8px 14px;
  border: 1px solid var(--paper-2);
  background: transparent;
  color: var(--gray);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 160ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .chip:hover {
  border-color: var(--accent);
  color: var(--accent-2);
}

.page-about .chip.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--cream);
}

.page-about .filter-status {
  margin-left: auto;
  font-size: 12.5px;
  color: var(--gray);
}

/* ---------- 时间轴 ---------- */

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

.page-about .tl-list::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 10px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent) 0 12%, var(--paper-2) 12% 100%);
}

.page-about .tl-item {
  position: relative;
  padding-left: 46px;
  padding-bottom: 28px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 26px;
  width: 12px;
  height: 12px;
  transform: rotate(45deg);
  background: var(--paper);
  border: 2px solid var(--accent);
  z-index: 1;
}

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

.page-about .tl-item[hidden] {
  display: none;
}

.page-about .tl-year {
  display: block;
  margin-bottom: 8px;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--accent-2);
}

.page-about .tl-body {
  background: var(--paper-3);
  padding: 18px 20px;
  clip-path: var(--cut-lg);
}

.page-about .tl-code {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.page-about .tl-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.3;
  color: var(--text);
}

.page-about .tl-body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .tl-more {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--paper-2);
}

.page-about .tl-more summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--cyan-2);
}

.page-about .tl-more summary:hover {
  color: var(--accent-2);
}

.page-about .tl-more p {
  margin-top: 10px;
  font-size: 15px;
  color: var(--gray);
}

/* ---------- 取舍记录 ---------- */

.page-about .about-decisions {
  position: relative;
  background: var(--ink-2);
  color: var(--paper);
}

.page-about .dc-grid {
  display: grid;
  gap: 14px;
  margin-bottom: 26px;
}

.page-about .dc-col {
  background: var(--ink);
  padding: 20px 20px 8px;
  clip-path: var(--cut-lg);
}

.page-about .dc-col--keep {
  background: var(--ink-3);
  border-left: 3px solid var(--accent);
}

.page-about .dc-head {
  margin: 0 0 14px;
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .dc-col--drop .dc-head {
  color: var(--paper-2);
}

.page-about .dc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .dc-list li {
  padding: 14px 0;
  border-top: 1px solid rgba(240, 230, 210, 0.14);
}

.page-about .dc-list h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17.5px;
  color: var(--cream);
}

.page-about .dc-col--drop .dc-list h3 {
  color: var(--paper-2);
  text-decoration: line-through;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
}

.page-about .dc-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-2);
}

.page-about .dc-note {
  display: grid;
  gap: 12px;
  padding: 20px;
  background: var(--ink);
  border-left: 3px solid var(--cyan);
  margin-bottom: 28px;
}

.page-about .dc-num {
  font-size: clamp(34px, 7vw, 54px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .dc-note p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-2);
}

/* ---------- 维护团队 ---------- */

.page-about .team-grid {
  display: grid;
  gap: 14px;
  margin-bottom: 28px;
}

.page-about .team-card {
  background: var(--paper-3);
  padding: 20px;
  clip-path: var(--cut-lg);
}

.page-about .team-card--lead {
  background: var(--paper-2);
}

.page-about .team-code {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent-2);
}

.page-about .team-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 21px;
  color: var(--text);
}

.page-about .team-card p {
  margin: 0 0 10px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .team-note {
  padding-left: 12px;
  border-left: 2px solid var(--accent);
  color: var(--gray);
  font-size: 14.5px;
}

/* ---------- 回访笔记 ---------- */

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

.page-about .voice {
  padding: 18px 20px;
  border-left: 3px solid var(--accent);
  background: var(--paper-3);
}

.page-about .voice-type {
  margin: 0 0 10px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--cyan-2);
}

.page-about .voice-text {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--text);
}

/* ---------- 长期做法 ---------- */

.page-about .about-promise {
  background: var(--paper-2);
}

.page-about .promise-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  counter-reset: none;
}

.page-about .promise-item {
  display: grid;
  gap: 10px;
  padding: 22px 0;
  border-top: 1px solid rgba(26, 37, 48, 0.16);
}

.page-about .promise-item:last-child {
  border-bottom: 1px solid rgba(26, 37, 48, 0.16);
}

.page-about .promise-num {
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.page-about .promise-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  color: var(--text);
}

.page-about .promise-item p {
  margin: 0;
  max-width: 72ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--gray);
}

/* ---------- 未来计划 ---------- */

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

.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(240, 230, 210, 0.16);
}

.page-about .next-item {
  background: var(--ink);
  padding: 22px 20px;
}

.page-about .next-num {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .next-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  color: var(--cream);
}

.page-about .next-item p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--paper-2);
}

/* ---------- 结尾引导 ---------- */

.page-about .about-cta {
  background: var(--ink-3);
  color: var(--paper);
  padding: clamp(38px, 6vw, 66px) 0;
  border-top: 3px solid var(--accent);
}

.page-about .about-cta-inner {
  display: grid;
  gap: 22px;
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.15;
  color: var(--cream);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-2);
}

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

.page-about .about-cta .btn--ghost {
  border-color: var(--paper-2);
  color: var(--cream);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero {
    padding-bottom: 60px;
  }

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

  .page-about .dc-note {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: 24px;
  }

  .page-about .voice-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 22px;
  }

  .page-about .voice:nth-child(even) {
    transform: translateY(22px);
  }

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

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1.1fr) auto;
    align-items: center;
    gap: 32px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: end;
    gap: 48px;
  }

  .page-about .about-index {
    margin-bottom: 4px;
  }

  .page-about .tl-list::before {
    left: 31px;
  }

  .page-about .tl-item {
    padding-left: 78px;
    padding-bottom: 34px;
  }

  .page-about .tl-item::before {
    left: 26px;
  }

  .page-about .tl-body {
    max-width: 620px;
  }

  .page-about .tl-item:nth-child(even) .tl-body {
    max-width: 560px;
    margin-left: 58px;
  }

  .page-about .tl-item:first-child .tl-body {
    max-width: 700px;
    margin-left: 0;
  }

  .page-about .about-shot--wide {
    margin-left: -4%;
    margin-right: -4%;
  }

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

  .page-about .team-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 16px;
  }

  .page-about .promise-item {
    grid-template-columns: 92px minmax(0, 1fr);
    align-items: start;
    padding: 26px 0;
  }

  .page-about .promise-num {
    padding-top: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .voice:nth-child(even) {
    transform: none;
  }

  .page-about .chip,
  .page-about .about-index .index-row a {
    transition: none;
  }
}