.page-about {
  --about-green: #39FF14;
  --about-orange: #FF6A00;
  --about-deep: #0F1B2E;
  --about-teal: #0A3D3F;
  --about-wine: #7B1E3F;
  --about-indigo: #3F51B5;
  --about-text: #1F2937;
  --about-muted: #6B7280;
  --about-fog: #E8F0F8;
  --about-white: #FFFFFF;
  --about-radius-sec: 28px;
  --about-radius-card: 18px;
  --about-font-heading: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --about-font-body: "Open Sans", "Noto Sans SC", Arial, sans-serif;
  --about-font-mono: "Roboto Mono", SFMono-Regular, monospace;
  --about-space-section: clamp(4rem, 9vw, 7rem);
  --about-space-panel: clamp(1.75rem, 4vw, 3.5rem);
  max-width: 100vw;
  overflow-x: hidden;
  font-family: var(--about-font-body);
  color: var(--about-text);
  background-color: var(--about-white);
  line-height: 1.7;
}

.page-about .container {
  width: min(1216px, 92%);
  margin-inline: auto;
}

.page-about .breadcrumbs {
  width: min(1216px, 92%);
  margin: 0 auto;
  padding-top: 24px;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.875rem;
  color: var(--about-muted);
}

.page-about .breadcrumbs a {
  color: var(--about-text);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumbs a:hover {
  color: var(--about-deep);
  text-decoration: underline;
}

.page-about .over-label {
  font-family: var(--about-font-heading);
  font-weight: 800;
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--about-green);
}

.panel--deep .over-label,
.panel--teal .over-label {
  opacity: 0.85;
}

.page-about .section-title {
  font-family: var(--about-font-heading);
  font-weight: 800;
  font-size: clamp(1.6rem, 3.5vw, 2rem);
  color: var(--about-deep);
  margin: 8px 0 12px;
  line-height: 1.25;
}

.page-about .section-desc {
  font-size: 1rem;
  color: var(--about-muted);
  max-width: 640px;
}

.panel--deep.section-panel,
.panel--teal.section-panel {
  position: relative;
  overflow: hidden;
}

.panel--deep.section-panel .section-title {
  color: var(--about-white);
}

.panel--teal.section-panel .section-title {
  color: var(--about-white);
}

.panel--deep.section-panel .section-desc,
.panel--teal.section-panel .section-desc {
  color: rgba(255, 255, 255, 0.72);
}

.page-about .section-panel {
  padding: var(--about-space-section) 0;
  position: relative;
}

.page-about .section-panel--cut {
  clip-path: polygon(0 0, calc(100% - 40px) 0, 100% 40px, 100% 100%, 0 100%);
}

.page-about .panel--deep {
  background-color: var(--about-deep);
  background-image: 
    linear-gradient(135deg, rgba(57, 255, 20, 0.06) 0%, transparent 36%),
    linear-gradient(315deg, rgba(255, 106, 0, 0.05) 0%, transparent 30%);
}

.page-about .panel--teal {
  background-color: var(--about-teal);
  background-image:
    radial-gradient(circle at 85% 15%, rgba(57, 255, 20, 0.08) 0%, transparent 45%);
}

.page-about .section-heading {
  margin-bottom: clamp(2.2rem, 5vw, 3.5rem);
}

.page-about .section-heading .over-label {
  display: block;
  margin-bottom: 4px;
}

.page-about .motion-track {
  width: 100%;
  height: 8px;
  background: repeating-linear-gradient(
    135deg,
    var(--about-green) 0,
    var(--about-green) 14px,
    transparent 14px,
    transparent 28px
  );
}

/* ---------- Hero ---------- */
.about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
  padding: clamp(2rem, 5vw, 4rem) 4vw clamp(3rem, 7vw, 6rem);
  position: relative;
  background: 
    linear-gradient(180deg, var(--about-fog) 0%, var(--about-white) 100%);
  overflow: hidden;
}

.about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: linear-gradient(120deg, transparent 0%, rgba(15, 27, 46, 0.02) 100%);
  z-index: 0;
  pointer-events: none;
}

.about-hero__content {
  position: relative;
  z-index: 1;
}

.about-hero .over-label {
  display: block;
  margin-bottom: 10px;
  color: var(--about-green);
}

.about-hero h1 {
  font-family: var(--about-font-heading);
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.2;
  color: var(--about-deep);
  margin: 0 0 18px;
  letter-spacing: -0.02em;
}

.about-hero__lead {
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  color: var(--about-text);
  max-width: 560px;
  margin: 0 0 28px;
}

.about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 24px;
}

.about-hero__stat {
  background: var(--about-white);
  border-radius: var(--about-radius-card);
  padding: 14px 20px;
  box-shadow: 0 6px 20px rgba(15, 27, 46, 0.08);
  border-left: 4px solid var(--about-green);
  display: flex;
  flex-direction: column;
  min-width: 116px;
}

.about-hero__stat .data-num {
  font-family: var(--about-font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--about-deep);
  line-height: 1.2;
}

.about-hero__stat-label {
  font-size: 0.8rem;
  color: var(--about-muted);
  margin-top: 4px;
}

.about-hero__note {
  font-size: 0.9rem;
  color: var(--about-muted);
  border-left: 3px solid var(--about-orange);
  padding-left: 14px;
  max-width: 560px;
}

.about-hero__visual {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.about-hero__image {
  width: 100%;
  max-width: 480px;
  height: auto;
  border-radius: var(--about-radius-sec);
  box-shadow: 0 18px 50px rgba(15, 27, 46, 0.22);
  object-fit: cover;
}

.about-hero__speed-line {
  position: absolute;
  top: 24%;
  left: -20px;
  width: 120px;
  height: 6px;
  background: linear-gradient(90deg, var(--about-green), transparent);
  transform: rotate(-18deg);
  border-radius: 3px;
  opacity: 0.6;
  z-index: 2;
  pointer-events: none;
}

.about-hero__speed-line--alt {
  top: 66%;
  left: auto;
  right: -16px;
  width: 160px;
  height: 4px;
  background: linear-gradient(270deg, var(--about-orange), transparent);
  transform: rotate(14deg);
}

/* ---------- Mission ---------- */
.about-mission__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.about-mission__text p {
  margin: 0 0 16px;
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.82);
}

.about-mission__promise {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--about-radius-card);
  padding: 24px;
  display: grid;
  gap: 4px;
}

.about-mission__promise h3 {
  font-family: var(--about-font-heading);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--about-white);
  margin: 0 0 12px;
}

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

.about-mission__promise li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.about-mission__promise li p {
  margin: 0;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.65);
}

.page-about .tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  font-family: var(--about-font-heading);
}

.page-about .tag--green {
  background: rgba(57, 255, 20, 0.18);
  color: var(--about-green);
  border: 1px solid rgba(57, 255, 20, 0.3);
}

.page-about .tag--orange {
  background: rgba(255, 106, 0, 0.18);
  color: var(--about-orange);
  border: 1px solid rgba(255, 106, 0, 0.3);
}

.page-about .tag--wine {
  background: rgba(123, 30, 63, 0.2);
  color: #ff7ea8;
  border: 1px solid rgba(255, 126, 168, 0.3);
}

/* ---------- Timeline ---------- */
.about-journey {
  margin-bottom: var(--about-space-section);
}

.about-journey__filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 36px;
}

.about-journey__filter .filter-btn {
  border: 1px solid var(--about-deep);
  background: transparent;
  color: var(--about-deep);
  padding: 8px 20px;
  border-radius: 999px;
  font-size: 0.86rem;
  font-weight: 700;
  font-family: var(--about-font-heading);
  cursor: pointer;
  transition: all 0.22s ease;
}

.about-journey__filter .filter-btn:hover {
  border-color: var(--about-deep);
  background: var(--about-fog);
}

.about-journey__filter .filter-btn[aria-pressed="true"] {
  background: var(--about-deep);
  color: var(--about-white);
  border-color: var(--about-deep);
}

.about-journey__timeline {
  position: relative;
  display: grid;
  gap: 0;
}

.about-journey__line {
  position: absolute;
  top: 0;
  left: 22px;
  bottom: 0;
  width: 4px;
  color: var(--about-deep);
  opacity: 0.7;
  pointer-events: none;
  transform: translateX(-50%);
}

.about-journey__line svg {
  width: 100%;
  height: 100%;
}

.journey-item {
  position: relative;
  padding: 0 0 0 58px;
  border: 0;
}

.journey-item[data-hidden="true"] {
  display: none;
}

.journey-item__trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  width: 100%;
  border: 0;
  background: transparent;
  cursor: pointer;
  text-align: left;
  padding: 16px 20px;
  border-radius: var(--about-radius-card);
  transition: background-color 0.2s ease;
  position: relative;
}

.journey-item__trigger:hover {
  background: var(--about-fog);
}

.journey-item__dot {
  position: absolute;
  left: -51px;
  top: 24px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--about-green);
  border: 3px solid var(--about-white);
  box-shadow: 0 0 0 3px var(--about-deep), 0 0 0 6px rgba(57, 255, 20, 0.25);
  z-index: 1;
}

.journey-item:nth-child(even) .journey-item__dot {
  background: var(--about-orange);
}

.journey-item__year {
  font-family: var(--about-font-mono);
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--about-deep);
  letter-spacing: -0.02em;
  min-width: 70px;
}

.journey-item__title {
  font-family: var(--about-font-heading);
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--about-text);
}

.journey-item__content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
  padding: 0 20px;
}

.journey-item[data-open="true"] .journey-item__content {
  max-height: 800px;
  padding: 0 20px 20px;
}

.journey-item__body {
  background: var(--about-fog);
  border-radius: var(--about-radius-card);
  padding: 20px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  border-left: 4px solid var(--about-green);
}

.journey-item:nth-child(even) .journey-item__body {
  border-left-color: var(--about-orange);
}

.journey-item__body p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--about-text);
}

.journey-item__body img {
  width: 100%;
  max-width: 260px;
  height: auto;
  border-radius: 12px;
  object-fit: cover;
  align-self: center;
  justify-self: center;
}

.journey-item__data {
  font-family: var(--about-font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--about-deep);
}

/* ---------- Team ---------- */
.about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: clamp(2.4rem, 5vw, 3.8rem);
}

.about-team__card {
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--about-radius-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.about-team__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.18);
}

.about-team__icon {
  color: var(--about-green);
  width: 48px;
  height: 48px;
}

.about-team__card:nth-child(2) .about-team__icon {
  color: var(--about-orange);
}

.about-team__card:nth-child(3) .about-team__icon {
  color: #a5b8ff;
}

.about-team__card h3 {
  font-family: var(--about-font-heading);
  font-weight: 800;
  font-size: 1.1rem;
  margin: 0;
  color: var(--about-white);
}

.about-team__card p {
  margin: 0;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.68);
}

.about-team__certification {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.8rem;
  align-items: center;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--about-radius-sec);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.about-team__certification img {
  width: 100%;
  height: auto;
  border-radius: 14px;
  object-fit: cover;
}

.about-team__cert-text h3 {
  font-family: var(--about-font-heading);
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--about-white);
  margin: 0 0 14px;
}

.about-team__cert-text ul {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.about-team__cert-text li {
  position: relative;
  padding-left: 22px;
  font-size: 0.94rem;
  color: rgba(255, 255, 255, 0.78);
}

.about-team__cert-text li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 10px;
  height: 10px;
  background: var(--about-green);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
}

.about-team__cert-text p {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.62);
  margin: 0;
}

/* ---------- Services ---------- */
.about-services__list {
  display: grid;
  gap: 1rem;
}

.about-services__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
  align-items: start;
  background: var(--about-white);
  border-radius: var(--about-radius-card);
  padding: 24px;
  border: 1px solid rgba(15, 27, 46, 0.08);
  box-shadow: 0 4px 16px rgba(15, 27, 46, 0.04);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.about-services__item:hover {
  box-shadow: 0 12px 36px rgba(15, 27, 46, 0.1);
  transform: translateX(4px);
}

.about-services__index {
  font-family: var(--about-font-mono);
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--about-green);
  background: var(--about-deep);
  width: 58px;
  height: 58px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.about-services__item:nth-child(2) .about-services__index {
  background: var(--about-orange);
  color: var(--about-white);
}

.about-services__item:nth-child(3) .about-services__index {
  background: var(--about-teal);
  color: var(--about-green);
}

.about-services__item:nth-child(4) .about-services__index {
  background: var(--about-indigo);
  color: var(--about-white);
}

.about-services__content h3 {
  font-family: var(--about-font-heading);
  font-weight: 800;
  font-size: 1.06rem;
  margin: 0 0 6px;
  color: var(--about-deep);
}

.about-services__content p {
  margin: 0 0 12px;
  font-size: 0.92rem;
  color: var(--about-muted);
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-decoration: none;
  border-radius: 10px;
  font-family: var(--about-font-heading);
  font-weight: 700;
  font-size: 0.85rem;
  padding: 9px 18px;
  transition: all 0.2s ease;
}

.page-about .btn--ghost {
  border: 1.5px solid var(--about-deep);
  color: var(--about-deep);
  background: transparent;
}

.page-about .btn--ghost:hover {
  background: var(--about-deep);
  color: var(--about-white);
}

/* ---------- Motion-track ---------- */
.page-about .motion-track {
  margin-top: 0;
}

/* 筛选按钮隐藏项 */
.journey-item[data-hidden] {
  display: none !important;
}

/* ---------- Reveal ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Desktop Breakpoint ---------- */
@media (min-width: 768px) {
  .page-about .about-hero {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 3.2rem;
    padding-inline: clamp(2rem, 6vw, 7vw);
  }

  .about-hero__image {
    max-width: 560px;
  }

  .page-about .about-mission__grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.6rem;
  }

  .page-about .about-team__certification {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 2.6rem;
  }

  .page-about .about-journey__line {
    left: 32px;
  }

  .page-about .journey-item {
    padding-left: 88px;
  }

  .page-about .journey-item__dot {
    left: -74px;
    width: 18px;
    height: 18px;
  }

  .page-about .journey-item__trigger {
    padding: 18px 24px;
  }

  .page-about .journey-item__body {
    grid-template-columns: 1fr auto;
  }

  .page-about .journey-item__body img {
    max-width: 220px;
  }

  .page-about .about-services__list {
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem;
  }

  .page-about .about-services__item {
    padding: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }

  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 420px) {
  .page-about .about-hero__stats {
    flex-direction: column;
  }

  .page-about .about-hero__stat {
    min-width: 100%;
  }

  .page-about .journey-item__year {
    min-width: 56px;
    font-size: 1.2rem;
  }

  .page-about .about-services__item {
    grid-template-columns: 1fr;
  }

  .page-about .about-services__index {
    width: 48px;
    height: 48px;
    font-size: 1.1rem;
  }
}