.page-about {
  --about-cut: 16px;
  --about-line: rgba(99, 245, 210, 0.16);
  background: var(--ink);
  color: var(--text);
  overflow-x: clip;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--ink);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.32;
  filter: saturate(0.85) contrast(1.08);
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(90deg, rgba(167, 243, 208, 0.05) 0 1px, transparent 1px 92px),
    linear-gradient(102deg, rgba(7, 26, 20, 0.98) 0%, rgba(7, 26, 20, 0.88) 46%, rgba(14, 43, 34, 0.52) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 20px;
  padding-block: clamp(48px, 9vw, 104px) clamp(40px, 7vw, 76px);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 7.2vw, 76px);
  line-height: 0.99;
  letter-spacing: -0.02em;
  max-width: 16ch;
}

.page-about .about-hero h1 em {
  display: block;
  font-style: normal;
  color: var(--cyan);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(16px, 2.2vw, 18px);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero__facts li {
  flex: 1 1 148px;
  min-width: 0;
  padding: 14px 16px;
  background: rgba(18, 61, 48, 0.68);
  border-left: 2px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-hero__facts .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.6vw, 30px);
  line-height: 1.15;
  color: var(--cyan);
}

.page-about .fact-label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ============ 章节骨架 ============ */
.page-about .chapter {
  display: grid;
  gap: clamp(20px, 4vw, 44px);
  padding-block: clamp(44px, 6.5vw, 88px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 92px;
}

.page-about .chapter:first-of-type {
  border-top: 0;
}

.page-about .chapter__head {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .chapter__num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 6vw, 58px);
  line-height: 0.9;
  letter-spacing: 0.02em;
  color: rgba(99, 245, 210, 0.24);
}

.page-about .chapter__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.page-about .chapter__sub {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--amber);
  text-transform: none;
}

.page-about .chapter__body {
  display: grid;
  gap: clamp(16px, 2.6vw, 26px);
  min-width: 0;
}

.page-about .about-lead {
  margin: 0;
  font-size: clamp(16px, 2.1vw, 18px);
  line-height: 1.8;
  color: var(--text);
}

.page-about .chapter__body > p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

/* ============ 01 定位 ============ */
.page-about .origin-points {
  display: grid;
  gap: 12px;
  margin-top: 4px;
}

.page-about .origin-point {
  padding: 16px 18px;
  background: rgba(14, 43, 34, 0.82);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
}

.page-about .origin-point h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .origin-point p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

/* ============ 02 时间线 ============ */
.page-about .year-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .year-jump a {
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  background: rgba(18, 61, 48, 0.7);
  border: 1px solid var(--line);
  transition: border-color var(--ease), background var(--ease), color var(--ease);
}

.page-about .year-jump a:hover,
.page-about .year-jump a:focus-visible {
  border-color: var(--cyan);
  background: rgba(99, 245, 210, 0.14);
}

.page-about .timeline-wrap {
  position: relative;
  padding-left: 2px;
}

.page-about .timeline-tex {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.page-about .timeline-tex img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.13;
  filter: saturate(0.6);
}

.page-about .timeline {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 4px 0 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 26px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--line) 52%, rgba(30, 92, 73, 0));
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(22px, 3.6vw, 34px) 42px;
  scroll-margin-top: 96px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 2px;
  width: 24px;
  height: 24px;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(99, 245, 210, 0.07);
  transition: background var(--ease), box-shadow var(--ease);
}

.page-about .tl-item:hover::before {
  background: rgba(99, 245, 210, 0.22);
  box-shadow: 0 0 0 6px rgba(99, 245, 210, 0.12);
}

.page-about .tl-year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .tl-card {
  padding: clamp(15px, 2.8vw, 24px);
  background: linear-gradient(150deg, rgba(18, 61, 48, 0.92), rgba(14, 43, 34, 0.7));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .tl-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.6vw, 22px);
  line-height: 1.3;
}

.page-about .tl-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============ 03 能力 ============ */
.page-about .cap-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .cap {
  padding: 16px 18px;
  background: rgba(18, 61, 48, 0.5);
  border: 1px solid var(--line);
  border-top: 2px solid rgba(99, 245, 210, 0.55);
  transition: background var(--ease), border-color var(--ease), transform var(--ease);
}

.page-about .cap:hover,
.page-about .cap:focus-within {
  background: rgba(18, 61, 48, 0.92);
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .cap h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: 0.01em;
}

.page-about .cap p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .metric-band {
  display: grid;
  gap: 1px;
  margin-top: 4px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .metric {
  padding: 16px 18px;
  background: var(--ink-2);
}

.page-about .metric .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 38px);
  line-height: 1;
  color: var(--amber);
}

.page-about .metric-unit {
  margin-left: 6px;
  font-size: 14px;
  color: var(--muted);
}

.page-about .metric p {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ============ 04 团队 ============ */
.page-about .team-grid {
  display: grid;
  gap: 20px;
}

.page-about .team-figure {
  margin: 0;
  display: grid;
  gap: 10px;
}

.page-about .team-figure figcaption {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

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

.page-about .crew li {
  padding: 14px 16px;
  background: rgba(14, 43, 34, 0.86);
  border-left: 3px solid var(--cyan);
}

.page-about .crew li:nth-child(2) {
  border-left-color: var(--amber);
}

.page-about .crew li:nth-child(3) {
  border-left-color: var(--yellow);
}

.page-about .crew li:nth-child(4) {
  border-left-color: var(--red);
}

.page-about .crew h3 {
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
}

.page-about .crew p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ============ 05 服务承诺 ============ */
.page-about .promise-card {
  display: grid;
  gap: 14px;
  padding: clamp(18px, 3vw, 28px);
  background: linear-gradient(142deg, rgba(18, 61, 48, 0.95), rgba(7, 26, 20, 0.92));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .promise-card > p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--text);
}

.page-about .promise-card .contact-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .promise-card .contact-list li {
  display: grid;
  gap: 2px;
  padding-left: 12px;
  border-left: 2px solid rgba(99, 245, 210, 0.4);
}

.page-about .promise-card .contact-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .promise-card .contact-value {
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  word-break: break-word;
}

.page-about .promise-card .contact-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

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

.page-about .entry-list a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 15px 16px;
  background: var(--ink-2);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
  text-decoration: none;
  transition: background var(--ease), color var(--ease), padding-left var(--ease);
}

.page-about .entry-list a:hover,
.page-about .entry-list a:focus-visible {
  background: rgba(18, 61, 48, 0.95);
  color: var(--cyan);
  padding-left: 22px;
}

.page-about .entry-tag {
  flex: none;
  padding: 2px 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--cyan);
}

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

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

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

@media (min-width: 900px) {
  .page-about .chapter {
    grid-template-columns: minmax(0, 232px) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .chapter__head {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: 24px;
  }

  .page-about .promise-card {
    padding: 30px 32px;
  }
}

@media (min-width: 1120px) {
  .page-about .cap-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .cap,
  .page-about .entry-list a,
  .page-about .tl-item::before,
  .page-about .year-jump a {
    transition: none;
  }

  .page-about .cap:hover,
  .page-about .cap:focus-within {
    transform: none;
  }
}