.page-about {
  --about-accent: #FF6B35;
  --about-green: #39FF14;
  --about-moss: #8A9A5B;
  --about-clay: #C8795A;
  --about-cream: #F5F0E6;
  --about-cream-2: #ECE4D6;
  --about-blue-950: #050D1A;
  --about-line: rgba(245, 240, 230, 0.22);
  --about-line-strong: rgba(245, 240, 230, 0.36);

  position: relative;
  min-height: 60vh;
  padding-top: 118px;
  overflow: hidden;
  color: var(--text-default);
  background:
    radial-gradient(1100px 620px at 92% 2%, rgba(255, 107, 53, 0.18), transparent 60%),
    radial-gradient(900px 520px at 6% 52%, rgba(138, 154, 91, 0.12), transparent 55%),
    var(--blue-900);
}

.page-about__topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 48px;
}

.page-about__topbar .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}

.page-about__topbar .breadcrumb-item {
  color: var(--text-muted);
  text-decoration: none;
}

.page-about__topbar .breadcrumb-item[aria-current="page"] {
  color: var(--text-strong);
}

.page-about__breadcrumb-sep {
  color: var(--about-accent);
}

.page-about__topbar-tip {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--about-accent);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.page-about__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--about-accent);
}

.page-about__kicker::before {
  content: "";
  width: 34px;
  height: 2px;
  background: currentColor;
  transform: skewX(-28deg);
}

.page-about h1,
.page-about h2 {
  font-family: var(--font-heading);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 0.95;
  color: var(--text-strong);
}

.page-about__section-head {
  margin-bottom: 48px;
}

.page-about__section-head h2,
.page-about__cert-head h2,
.page-about__next h2 {
  margin: 0 0 22px;
  font-size: clamp(36px, 5vw, 72px);
}

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

.page-about__actions .btn {
  text-align: center;
}

/* ---------- 品牌理念 ---------- */

.page-about__philosophy {
  position: relative;
  padding-bottom: 72px;
}

.page-about__philosophy::after {
  content: "一步直达";
  position: absolute;
  right: 0;
  bottom: 4%;
  z-index: 0;
  font-family: var(--font-heading);
  font-size: clamp(80px, 14vw, 190px);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(245, 240, 230, 0.08);
  pointer-events: none;
  white-space: nowrap;
}

.page-about__philosophy-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 32px;
  align-items: start;
}

.page-about__philosophy-copy h1 {
  margin: 0 0 18px;
  font-size: clamp(56px, 10vw, 120px);
}

.page-about__manifesto {
  margin: 0 0 20px;
  padding-left: 14px;
  border-left: 4px solid var(--about-accent);
  font-family: var(--font-heading);
  font-size: clamp(28px, 5vw, 56px);
  line-height: 1.1;
  text-transform: uppercase;
  color: var(--about-green);
}

.page-about__intro-lead {
  margin: 0 0 18px;
  font-size: clamp(18px, 2.4vw, 26px);
  line-height: 1.5;
  color: var(--text-strong);
}

.page-about__body {
  max-width: 58ch;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-default);
}

.page-about__philosophy-figure {
  position: relative;
  margin: 0;
}

.page-about__philosophy-figure::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border: 2px solid var(--blue-950);
  background: var(--about-accent);
  transform: translate(14px, 14px);
}

.page-about__philosophy-figure img {
  display: block;
  position: relative;
  width: 100%;
  height: auto;
  border: 2px solid var(--about-line);
  box-shadow: var(--shadow-card);
}

/* ---------- 发展历程 ---------- */

.page-about__milestones {
  position: relative;
  padding: 72px 0 96px;
  border-top: 1px solid rgba(245, 240, 230, 0.1);
  border-bottom: 1px solid rgba(245, 240, 230, 0.1);
  background: linear-gradient(180deg, rgba(5, 13, 26, 0.35), rgba(5, 13, 26, 0.8));
}

.page-about__timeline-layout {
  display: grid;
  gap: 40px;
  align-items: start;
}

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

.page-about__timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 8px 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about__timeline-item:last-child {
  border-bottom: 0;
}

.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 34px;
  width: 10px;
  height: 10px;
  background: var(--about-accent);
  transform: rotate(45deg);
}

.page-about__year {
  grid-column: 1;
  padding-left: 26px;
  font-family: var(--font-heading);
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1;
  color: var(--about-accent);
}

.page-about__event {
  grid-column: 2;
}

.page-about__event h3 {
  margin: 0 0 8px;
  font-size: 20px;
  color: var(--text-strong);
}

.page-about__event p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-default);
}

.page-about__timeline-figure {
  margin: 0;
}

.page-about__timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 2px solid var(--about-line);
  box-shadow: 16px 16px 0 rgba(5, 13, 26, 0.55);
}

/* ---------- 资质认证 ---------- */

.page-about__cert {
  padding: 72px 0;
  border-top: 1px solid rgba(255, 107, 53, 0.3);
  border-bottom: 1px solid rgba(255, 107, 53, 0.3);
  background:
    linear-gradient(120deg, rgba(200, 121, 90, 0.16), transparent 45%),
    var(--blue-950);
}

.page-about__cert-grid {
  display: grid;
  gap: 48px;
  align-items: start;
}

.page-about__cert-head h2 {
  margin-top: 0;
}

.page-about__cert-note {
  max-width: 42ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-muted);
}

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

.page-about__cert-item {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 22px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about__cert-item:last-child {
  border-bottom: 0;
}

.page-about__cert-icon {
  flex: 0 0 auto;
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  border: 2px solid currentColor;
  color: var(--about-accent);
  box-shadow: 6px 6px 0 rgba(255, 107, 53, 0.24);
  transform: rotate(-4deg);
  transition: transform 0.25s ease, color 0.25s ease;
}

.page-about__cert-icon svg {
  display: block;
  width: 26px;
  height: 26px;
}

@media (hover: hover) {
  .page-about__cert-item:hover .page-about__cert-icon {
    color: var(--about-green);
    transform: rotate(0deg);
  }

  .page-about__cert-item:hover .page-about__cert-text h3 {
    color: var(--text-strong);
  }
}

.page-about__cert-text h3 {
  margin: 0 0 8px;
  font-size: 20px;
  color: var(--text-strong);
}

.page-about__cert-text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-default);
}

/* ---------- 服务规模 ---------- */

.page-about__dashboard {
  position: relative;
  padding: 80px 0 88px;
}

.page-about__dashboard::after {
  content: "";
  display: block;
  width: 100%;
  height: 2px;
  margin-top: 56px;
  background: linear-gradient(90deg, var(--about-green), transparent 70%);
}

.page-about__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px 16px;
  margin: 0;
}

.page-about__stat {
  position: relative;
  min-width: 0;
  padding-top: 20px;
  border-top: 4px solid var(--about-line-strong);
}

.page-about__stat dt {
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.page-about__stat dd {
  margin: 0;
  font-family: var(--font-body);
  font-size: clamp(44px, 7vw, 108px);
  font-weight: 100;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--text-strong);
}

.page-about__stat dd span {
  display: inline-block;
  vertical-align: 0.35em;
  font-size: 0.42em;
  font-weight: 200;
  color: var(--about-accent);
}

.page-about__stat p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-muted);
}

.page-about__stat--wide {
  grid-column: span 2;
}

.page-about__stat--glow {
  border-top-color: var(--about-green);
}

.page-about__stat--ember {
  border-top-color: var(--about-accent);
}

.page-about__stat--ember dd {
  font-size: clamp(34px, 6vw, 78px);
}

/* ---------- 合作生态 ---------- */

.page-about__partners {
  position: relative;
  padding: 80px 0;
  overflow: hidden;
}

.page-about__partners::before {
  content: "";
  position: absolute;
  top: -40px;
  right: -60px;
  width: 320px;
  height: 320px;
  border: 2px solid rgba(57, 255, 20, 0.14);
  border-radius: 18px;
  transform: rotate(24deg);
  pointer-events: none;
}

.page-about__partners .container {
  position: relative;
  z-index: 1;
}

.page-about__partners-lead {
  max-width: 62ch;
  margin: 0 0 36px;
  font-size: 18px;
  line-height: 1.8;
  color: var(--text-default);
}

.page-about__partners-layout {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about__partners-wall {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.page-about__partner-cell {
  position: relative;
  display: flex;
  min-height: 120px;
  flex-direction: column;
  justify-content: space-between;
  padding: 16px;
  border: 2px solid rgba(245, 240, 230, 0.2);
  background: rgba(5, 13, 26, 0.35);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about__partner-cell::before {
  content: "";
  width: 28px;
  height: 28px;
  margin-bottom: 14px;
  background: var(--about-moss);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.page-about__partner-cell:nth-child(2)::before {
  background: var(--about-accent);
  clip-path: circle(50% at 50% 50%);
}

.page-about__partner-cell:nth-child(3)::before {
  width: 28px;
  height: 28px;
  background: var(--about-green);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

.page-about__partner-cell:nth-child(4)::before {
  background: var(--about-clay);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

.page-about__partner-cell span {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-strong);
}

.page-about__partner-cell p {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-muted);
}

@media (hover: hover) {
  .page-about__partner-cell:hover {
    border-color: var(--about-green);
    transform: translateY(-4px);
  }
}

.page-about__partners-figure {
  margin: 0;
}

.page-about__partners-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 2px solid var(--about-line);
  box-shadow: var(--shadow-card);
}

/* ---------- 结尾行动区 ---------- */

.page-about__next {
  padding: 72px 0 88px;
  background: linear-gradient(110deg, var(--about-accent), var(--about-clay));
  color: var(--blue-950);
}

.page-about__next h2 {
  color: var(--blue-950);
}

.page-about__next p {
  max-width: 52ch;
  margin: 0 0 28px;
  font-size: 18px;
  line-height: 1.7;
  color: var(--blue-950);
}

.page-about__next .btn-primary {
  background: var(--blue-950);
  border-color: var(--blue-950);
  color: var(--text-strong);
}

.page-about__next .btn-secondary {
  border-color: var(--blue-950);
  color: var(--blue-950);
}

@media (hover: hover) {
  .page-about__next .btn-secondary:hover {
    background: var(--blue-950);
    color: var(--text-strong);
  }
}

/* ---------- 断点增强 ---------- */

@media (min-width: 640px) {
  .page-about__stats {
    gap: 32px 24px;
  }

  .page-about__partner-cell {
    min-height: 148px;
    padding: 18px;
  }
}

@media (min-width: 1024px) {
  .page-about__philosophy-grid {
    grid-template-columns: 1.08fr 0.92fr;
    gap: 56px;
    align-items: center;
  }

  .page-about__timeline-layout {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 64px;
  }

  .page-about__timeline-figure {
    position: sticky;
    top: 120px;
  }

  .page-about__cert-grid {
    grid-template-columns: 0.8fr 1.2fr;
    gap: 64px;
  }

  .page-about__partners-layout {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 56px;
  }
}

@media (min-width: 1080px) {
  .page-about__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 44px 32px;
  }

  .page-about__stat--wide {
    grid-column: span 2;
  }
}

@media (min-width: 900px) {
  .page-about__next {
    padding: 96px 0 120px;
    clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
  }
}