.page-about {
  --about-rail: 100px;
  --about-dot: 6;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  color: var(--white);
  background: linear-gradient(158deg, #03182a 0%, var(--ink-900) 32%, var(--ink-500) 100%);
  border-bottom: 1px solid rgba(169, 196, 212, 0.35);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, rgba(169, 196, 212, 0.16) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(90deg, rgba(169, 196, 212, 0.16) 0 1px, transparent 1px 46px);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0.06));
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), rgba(0, 0, 0, 0.06));
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -140px;
  top: -110px;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle at center, rgba(255, 106, 69, 0.4), rgba(255, 106, 69, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 44px);
  padding-top: clamp(30px, 5vw, 60px);
  padding-bottom: clamp(40px, 7vw, 84px);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
}

.page-about .about-hero .breadcrumb__item {
  color: rgba(227, 239, 246, 0.7);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb__item[aria-current="page"] {
  color: var(--coral-200);
}

.page-about .about-hero .breadcrumb__sep {
  color: rgba(227, 239, 246, 0.4);
}

.page-about .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--coral-200);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  max-width: 14em;
  font-size: var(--fs-display);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.page-about .about-hero .lede {
  max-width: 34em;
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: rgba(227, 239, 246, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__panel {
  position: relative;
  padding: 22px 20px 18px;
  background: rgba(4, 26, 43, 0.55);
  border: 1px solid rgba(169, 196, 212, 0.38);
}

.page-about .about-hero__panel::before,
.page-about .about-hero__panel::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 2px solid var(--coral-500);
}

.page-about .about-hero__panel::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__panel::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

.page-about .about-hero__panel-title {
  margin: 0 0 12px;
  font-size: var(--fs-mono);
  letter-spacing: 0.16em;
  color: var(--coral-200);
}

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

.page-about .hero-fact {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed rgba(169, 196, 212, 0.28);
}

.page-about .hero-fact:last-child {
  border-bottom: 0;
}

.page-about .hero-fact__k {
  font-size: var(--fs-small);
  color: rgba(227, 239, 246, 0.72);
}

.page-about .hero-fact__v {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--white);
  text-align: right;
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec {
  padding-top: clamp(48px, 7vw, 96px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-timeline,
.page-about .about-cadence,
.page-about .about-cta {
  background: var(--sand);
  color: var(--text);
}

.page-about .about-pains,
.page-about .about-reach {
  background: var(--mist-100);
  color: var(--text);
}

.page-about .about-team,
.page-about .about-trust {
  background: var(--ink-900);
  color: var(--mist-100);
}

.page-about .chapter {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 22px;
}

.page-about .chapter__index {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.14em;
  color: var(--coral-500);
}

.page-about .chapter__title {
  margin: 0;
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ink-700);
}

.page-about .chapter__line {
  flex: 1 1 auto;
  height: 1px;
  min-width: 24px;
  background: var(--line-soft);
}

.page-about .about-team .chapter__title,
.page-about .about-trust .chapter__title {
  color: var(--white);
}

.page-about .about-team .chapter__line,
.page-about .about-trust .chapter__line {
  background: rgba(169, 196, 212, 0.32);
}

.page-about .lede {
  max-width: 40em;
  margin: 0 0 8px;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--ink-700);
}

.page-about .about-team .lede,
.page-about .about-trust .lede {
  color: rgba(227, 239, 246, 0.82);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(to bottom, var(--coral-500), var(--line-soft));
}

.page-about .tl-item {
  position: relative;
  padding-left: 30px;
  padding-bottom: 30px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--sand);
  border: 2px solid var(--line);
  z-index: 1;
  transition: border-color 180ms var(--ease), background 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .tl-item.is-revealed::before {
  border-color: var(--coral-500);
  background: var(--coral-500);
  box-shadow: 0 0 0 4px rgba(255, 106, 69, 0.16);
}

.page-about .tl-item__year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.12em;
  color: var(--ink-500);
  transition: color 180ms var(--ease);
}

.page-about .tl-item.is-revealed .tl-item__year {
  color: var(--coral-500);
}

.page-about .tl-item__title {
  margin: 0 0 10px;
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .tl-item__text {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--text);
}

.page-about .tl-figure {
  margin: 20px 0 0;
}

.page-about .figure__media {
  overflow: hidden;
  border-radius: var(--radius);
  background-color: var(--ink-500);
  background-image:
    repeating-linear-gradient(0deg, rgba(169, 196, 212, 0.22) 0 1px, transparent 1px 26px),
    repeating-linear-gradient(90deg, rgba(169, 196, 212, 0.22) 0 1px, transparent 1px 26px);
}

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

.page-about .figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--ink-500);
}

/* ---------- 痛点 ---------- */
.page-about .pains {
  margin-top: 28px;
}

.page-about .pain-card {
  padding: 22px 20px 20px;
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-top: 3px solid var(--coral-500);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.page-about .pain-card__num {
  margin: 0 0 12px;
  font-size: var(--fs-mono);
  letter-spacing: 0.14em;
  color: var(--coral-600);
}

.page-about .pain-card__title {
  margin: 0 0 10px;
  font-size: var(--fs-h4);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink-900);
}

.page-about .pain-card__text {
  margin: 0 0 14px;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--ink-700);
}

.page-about .pain-card__note {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--palm-500);
}

.page-about .pains-note {
  margin: 26px 0 0;
  padding: 16px 18px;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--ink-700);
  background: var(--coral-200);
  border-radius: var(--radius-sm) var(--radius) var(--radius-sm) var(--radius);
}

.page-about .pains-note a {
  color: var(--ink-900);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 团队 ---------- */
.page-about .team-intro {
  display: grid;
  gap: 24px;
  margin-bottom: 34px;
}

.page-about .team-figure {
  margin: 0;
}

.page-about .about-team .figure__cap {
  color: rgba(227, 239, 246, 0.62);
}

.page-about .team-strip {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .team-block {
  padding: 22px 20px;
  background: rgba(227, 239, 246, 0.07);
  border: 1px solid rgba(169, 196, 212, 0.26);
  border-top: 3px solid var(--ink-500);
  border-radius: 26px 4px 26px 4px;
}

.page-about .team-block:nth-child(1) {
  border-top-color: var(--coral-500);
  border-radius: 4px 26px 4px 26px;
}

.page-about .team-block:nth-child(2) {
  border-top-color: var(--palm-500);
}

.page-about .team-block__idx {
  margin: 0 0 10px;
  font-size: var(--fs-mono);
  letter-spacing: 0.16em;
  color: var(--coral-200);
}

.page-about .team-block__title {
  margin: 0 0 6px;
  font-size: var(--fs-h4);
  font-weight: 700;
  color: var(--white);
}

.page-about .team-block__lead {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.08em;
  color: var(--palm-500);
}

.page-about .team-block__text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: rgba(227, 239, 246, 0.82);
}

.page-about .team-block__more {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed rgba(169, 196, 212, 0.3);
}

.page-about .team-block__more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.08em;
  color: var(--coral-200);
}

.page-about .team-block__more summary::-webkit-details-marker {
  display: none;
}

.page-about .team-block__more summary::after {
  content: " +";
}

.page-about .team-block__more[open] summary::after {
  content: " −";
}

.page-about .team-block__more ul {
  margin: 12px 0 0;
  padding-left: 18px;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: rgba(227, 239, 246, 0.78);
}

/* ---------- 节奏 ---------- */
.page-about .cadence-list {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-about .cadence-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 18px 20px;
  background: var(--white);
  border-left: 3px solid var(--ink-500);
  border-radius: 2px var(--radius) var(--radius) 2px;
  box-shadow: var(--shadow-soft);
}

.page-about .cadence-row__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.14em;
  color: var(--coral-600);
}

.page-about .cadence-row__title {
  margin: 0 0 6px;
  font-size: var(--fs-h4);
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .cadence-row__body p {
  margin: 0;
}

.page-about .cadence-row__text {
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--ink-700);
}

.page-about .cadence-row__text a {
  color: var(--ink-500);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .databand {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  background: rgba(169, 196, 212, 0.4);
  border: 1px solid var(--ink-900);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .databand__item {
  padding: 16px 16px 18px;
  background: var(--ink-900);
}

.page-about .databand__key {
  margin: 0 0 6px;
  font-size: var(--fs-mono);
  letter-spacing: 0.08em;
  color: rgba(227, 239, 246, 0.62);
}

.page-about .databand__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.4vw, 24px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

/* ---------- 覆盖 ---------- */
.page-about .reach-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 26px;
}

.page-about .reach-stat {
  padding: 16px 16px 18px;
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}

.page-about .reach-stat__v {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(22px, 4vw, 32px);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink-500);
}

.page-about .reach-stat__k {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.6;
  color: var(--ink-700);
}

.page-about .reach-note {
  margin: 18px 0 0;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--ink-700);
}

.page-about .cov {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  margin-top: 30px;
}

.page-about .cov-grid {
  display: grid;
  grid-template-columns: repeat(var(--about-dot), 1fr);
  gap: 8px;
  padding: 20px 18px;
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}

.page-about .cov-dot {
  position: relative;
  display: block;
  aspect-ratio: 1 / 1;
  background: var(--line-soft);
  border-radius: 2px;
}

.page-about .cov-dot--key {
  background: var(--coral-500);
  outline: none;
  transition: background 180ms var(--ease);
}

.page-about .cov-dot--key:hover,
.page-about .cov-dot--key:focus-visible {
  background: var(--ink-500);
  outline: 2px solid var(--coral-500);
  outline-offset: 2px;
}

.page-about .cov-dot__label {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 6px);
  z-index: 3;
  padding: 4px 7px;
  transform: translateX(-50%) translateY(4px);
  white-space: nowrap;
  background: var(--ink-900);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  border-radius: 2px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .cov-dot--key:hover .cov-dot__label,
.page-about .cov-dot--key:focus-visible .cov-dot__label {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.page-about .cov-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .cov-row {
  display: grid;
  grid-template-columns: 5.5em 1fr 3em;
  align-items: center;
  gap: 10px;
  font-size: var(--fs-small);
  color: var(--ink-700);
}

.page-about .cov-row__bar {
  display: block;
  height: 6px;
  background: var(--mist-100);
  border-radius: 3px;
  overflow: hidden;
}

.page-about .cov-row__bar i {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--ink-500), var(--coral-500));
  border-radius: 3px;
}

.page-about .cov-row__pct {
  text-align: right;
  color: var(--ink-900);
  font-size: var(--fs-mono);
}

.page-about .coast-band {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

.page-about .coast-band .figure__media--wide {
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
}

/* ---------- 信任 ---------- */
.page-about .honor-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .honor-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px dashed rgba(169, 196, 212, 0.3);
}

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

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

.page-about .honor-item__mark {
  width: 11px;
  height: 11px;
  margin-top: 8px;
  background: var(--coral-500);
  transform: rotate(45deg);
}

.page-about .honor-item__title {
  margin: 0 0 8px;
  font-size: var(--fs-h4);
  font-weight: 700;
  line-height: 1.35;
  color: var(--white);
}

.page-about .honor-item__text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: rgba(227, 239, 246, 0.76);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-top: clamp(44px, 6vw, 76px);
  padding-bottom: clamp(44px, 6vw, 76px);
}

.page-about .cta-frame {
  position: relative;
  padding: clamp(24px, 4vw, 44px);
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.page-about .cta-frame::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  bottom: 24px;
  width: 3px;
  background: var(--coral-500);
}

.page-about .cta-title {
  margin: 0 0 12px;
  font-size: var(--fs-h3);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .cta-text {
  margin: 0 0 22px;
  max-width: 38em;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--ink-700);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .databand {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .reach-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .cadence-row {
    grid-template-columns: 88px 1fr;
    align-items: start;
    gap: 18px;
    padding: 20px 24px;
  }

  .page-about .cadence-row__k {
    padding-top: 4px;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.35fr 0.85fr;
    align-items: start;
  }

  .page-about .about-hero__panel {
    margin-top: 52px;
  }

  .page-about .timeline::before {
    left: 118px;
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: var(--about-rail) 1fr;
    column-gap: 46px;
    padding-left: 0;
    padding-bottom: 44px;
  }

  .page-about .tl-item::before {
    left: 112px;
    top: 8px;
  }

  .page-about .tl-item__year {
    margin: 0;
    padding-top: 3px;
    text-align: right;
    font-size: var(--fs-body);
  }

  .page-about .tl-item__split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: start;
  }

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

  .page-about .team-intro {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    gap: 36px;
  }

  .page-about .team-strip {
    flex-direction: row;
    align-items: stretch;
  }

  .page-about .team-block {
    flex: 1.18 1 0;
  }

  .page-about .team-block:nth-child(2) {
    flex-grow: 1;
  }

  .page-about .team-block:nth-child(3) {
    flex-grow: 0.86;
  }

  .page-about .cov {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
  }

  .page-about .cov-grid {
    grid-template-columns: repeat(8, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item::before,
  .page-about .tl-item__year,
  .page-about .cov-dot--key,
  .page-about .cov-dot__label {
    transition: none;
  }
}