.page-about {
  --about-red: #E4002B;
  --about-navy: #0B1D3A;
  --about-marine: #1F222A;
  --about-silver: #C0C0C0;
  --about-neon: #39FF14;
  --about-white: #FFFFFF;
  --about-black: #0A0A0A;
  --about-light-gray: #D4D4D8;
  --about-font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --about-font-display: "Arial Black", "Noto Sans SC", "SimHei", "PingFang SC", "Microsoft YaHei", Impact, sans-serif;
  --about-font-mono: "Roboto Mono", "SFMono-Regular", "Consolas", "Courier New", monospace;
  background: var(--about-navy);
  color: var(--about-white);
  font-family: var(--about-font-body);
  overflow-x: hidden;
  line-height: 1.7;
}

.page-about .breadcrumb {
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px 20px 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--about-silver);
  display: flex;
  gap: 8px;
}

.page-about .breadcrumb a {
  color: var(--about-silver);
  text-decoration: none;
  transition: color 0.25s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--about-red);
}

.page-about .about-section {
  max-width: 1180px;
  margin: 0 auto;
  padding: 60px 20px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  position: relative;
}

.page-about .about-col-note {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  border-left: 3px solid var(--about-red);
  padding-left: 16px;
}

.page-about .about-chapter {
  font-family: var(--about-font-mono);
  font-size: 14px;
  color: var(--about-red);
  font-weight: 700;
  margin: 0;
  letter-spacing: 0.08em;
}

.page-about .about-note_text {
  font-size: 14px;
  color: var(--about-silver);
  margin: 0;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.page-about .about-col-main {
  min-width: 0;
}

.page-about .about-heading {
  font-family: var(--about-font-display);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 24px;
  font-weight: 900;
  position: relative;
}

.page-about .about-heading::after {
  content: "";
  display: block;
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--about-red) 0 30%, var(--about-neon) 30% 100%);
  margin-top: 12px;
}

.page-about .about-hero {
  padding-top: 40px;
  grid-template-columns: 1fr;
  gap: 24px;
  border-bottom: 1px solid rgba(192, 192, 192, 0.2);
}

.page-about .about-hero_left {
  position: relative;
  z-index: 2;
}

.page-about .about-hero_kicker {
  display: inline-block;
  font-family: var(--about-font-mono);
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--about-neon);
  border: 1px solid rgba(57, 255, 20, 0.4);
  padding: 4px 12px;
  margin: 0 0 20px;
  background: rgba(57, 255, 20, 0.06);
}

.page-about .about-hero h1 {
  font-family: var(--about-font-display);
  font-size: clamp(2.25rem, 6vw, 4rem);
  line-height: 1.15;
  font-weight: 900;
  margin: 0;
  letter-spacing: -0.02em;
}

.page-about .about-hero h1 span {
  display: block;
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-family: var(--about-font-body);
  font-weight: 300;
  color: var(--about-silver);
  margin-top: 10px;
  letter-spacing: 0.02em;
}

.page-about .about-hero_right {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-hero_lead {
  font-size: clamp(1rem, 2vw, 1.1875rem);
  line-height: 1.85;
  color: var(--about-light-gray);
  margin: 0;
  max-width: 34em;
  border-left: 2px solid var(--about-red);
  padding-left: 18px;
}

.page-about .about-hero_meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--about-silver);
  background: rgba(31, 34, 42, 0.6);
  padding: 10px 14px;
  border-radius: 4px;
  width: fit-content;
}

.page-about .about-hero_deco {
  position: absolute;
  right: -10px;
  bottom: 10px;
  font-family: var(--about-font-display);
  font-size: clamp(5rem, 14vw, 10rem);
  font-weight: 900;
  line-height: 0.8;
  color: transparent;
  -webkit-text-stroke: 2px rgba(228, 0, 43, 0.5);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  pointer-events: none;
  user-select: none;
  z-index: 1;
  opacity: 0.7;
}

.page-about .about-story {
  border-bottom: 1px solid rgba(192, 192, 192, 0.15);
}

.page-about .about-story_grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-story_txt p {
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--about-light-gray);
}

.page-about .about-story_quote {
  margin: 32px 0 0;
  padding: 20px 24px;
  background: var(--about-black);
  border-left: 4px solid var(--about-red);
  position: relative;
  overflow: hidden;
}

.page-about .about-story_quote p {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--about-white);
  font-family: var(--about-font-display);
  letter-spacing: 0.01em;
}

.page-about .about-story_quote-mark {
  position: absolute;
  right: 16px;
  top: -20px;
  font-size: 6rem;
  color: rgba(228, 0, 43, 0.2);
  font-family: Georgia, serif;
  line-height: 1;
}

.page-about .about-data {
  border-bottom: 1px solid rgba(192, 192, 192, 0.15);
}

.page-about .about-data_grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 28px;
}

.page-about .about-data_card {
  background: var(--about-marine);
  border: 1px solid rgba(192, 192, 192, 0.2);
  padding: 20px;
  transition: border-color 0.3s var(--ease-out), transform 0.3s var(--ease-out);
  position: relative;
  overflow: hidden;
}

.page-about .about-data_card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--about-red);
  transform: scaleY(0.3);
  transform-origin: bottom;
  transition: transform 0.35s var(--ease-out);
}

.page-about .about-data_card:hover,
.page-about .about-data_card:focus-within {
  border-color: var(--about-neon);
  transform: scale(1.02);
}

.page-about .about-data_card:hover::before {
  transform: scaleY(1);
}

.page-about .about-data_label {
  font-size: 13px;
  color: var(--about-silver);
  letter-spacing: 0.06em;
  margin: 0 0 8px;
  text-transform: uppercase;
}

.page-about .about-data_num {
  font-family: var(--about-font-mono);
  font-size: clamp(1.875rem, 4.5vw, 2.5rem);
  font-weight: 700;
  color: var(--about-white);
  margin: 0 0 6px;
  line-height: 1.2;
}

.page-about .about-data_num .data-number {
  color: var(--about-neon);
}

.page-about .about-data_desc {
  font-size: 14px;
  color: var(--about-light-gray);
  line-height: 1.6;
  margin: 0;
}

.page-about .about-data_figure {
  margin: 0;
  background: var(--about-black);
  border: 1px solid rgba(192, 192, 192, 0.15);
  overflow: hidden;
}

.page-about .about-data_figure img,
.page-about .about-versions_img img,
.page-about .about-local_figure img {
  width: 100%;
  height: auto;
  display: block;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-data_figure figcaption,
.page-about .about-versions_img figcaption,
.page-about .about-local_figure figcaption {
  font-size: 13px;
  color: var(--about-silver);
  padding: 10px 16px;
  border-top: 1px solid rgba(192, 192, 192, 0.1);
  background: var(--about-marine);
}

.page-about .about-versions {
  border-bottom: 1px solid rgba(192, 192, 192, 0.15);
}

.page-about .about-versions_intro {
  font-size: 1rem;
  color: var(--about-light-gray);
  line-height: 1.85;
  margin: 0 0 32px;
  max-width: 36em;
}

.page-about .about-timeline {
  margin-bottom: 36px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 28px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--about-red) 0 55%, var(--about-neon) 55% 100%);
  opacity: 0.8;
}

.page-about .about-timeline_item {
  position: relative;
  padding-left: 72px;
  padding-bottom: 28px;
}

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

.page-about .about-timeline_dot {
  position: absolute;
  left: 18px;
  top: 4px;
  width: 22px;
  height: 22px;
  padding: 4px;
  border: none;
  background: none;
  cursor: pointer;
}

.page-about .about-timeline_dot span {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--about-red);
  border: 3px solid var(--about-navy);
  box-shadow: 0 0 0 2px var(--about-red), 0 0 12px rgba(228, 0, 43, 0.5);
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-timeline_dot[aria-expanded="true"] span {
  background: var(--about-neon);
  box-shadow: 0 0 0 2px var(--about-neon), 0 0 16px rgba(57, 255, 20, 0.5);
}

.page-about .about-timeline_body {
  background: rgba(31, 34, 42, 0.6);
  border: 1px solid rgba(192, 192, 192, 0.15);
  padding: 18px 18px 16px;
  border-radius: 4px;
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.page-about .about-timeline_body:hover {
  border-color: rgba(228, 0, 43, 0.5);
  transform: translateX(4px);
}

.page-about .about-timeline_head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.page-about .about-timeline_version {
  font-family: var(--about-font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--about-neon);
  margin: 0;
}

.page-about .about-timeline_title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--about-white);
  margin: 0;
  font-family: var(--about-font-display);
}

.page-about .about-timeline_badge {
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 100px;
  background: rgba(228, 0, 43, 0.15);
  color: var(--about-red);
  border: 1px solid rgba(228, 0, 43, 0.4);
  letter-spacing: 0.06em;
  font-weight: 700;
}

.page-about .about-timeline_desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-light-gray);
  margin: 0;
}

.page-about .about-versions_tabs {
  background: var(--about-black);
  border: 1px solid rgba(192, 192, 192, 0.15);
  border-radius: 4px;
  margin-bottom: 28px;
  overflow: hidden;
}

.page-about .about-versions_tablist {
  display: flex;
  border-bottom: 1px solid rgba(192, 192, 192, 0.2);
  overflow-x: auto;
}

.page-about .about-versions_tablist .tab-link {
  flex: 0 0 auto;
  padding: 14px 20px;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--about-font-body);
  background: var(--about-black);
  color: var(--about-silver);
  border: none;
  border-right: 1px solid rgba(192, 192, 192, 0.1);
  cursor: pointer;
  transition: color 0.25s ease, background 0.25s ease;
  position: relative;
}

.page-about .about-versions_tablist .tab-link[aria-selected="true"] {
  color: var(--about-white);
  background: var(--about-marine);
}

.page-about .about-versions_tablist .tab-link[aria-selected="true"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--about-red);
}

.page-about .about-versions_tablist .tab-link:hover:not([aria-selected="true"]) {
  color: var(--about-neon);
}

.page-about .about-versions_tabs .tab-panel {
  padding: 20px;
}

.page-about .about-versions_tabs .tab-panel[data-open] {
  display: block;
}

.page-about .about-versions_tabs .tab-panel[hidden],
.page-about .about-versions_tabs .tab-panel:not([data-open]) {
  display: none;
}

.page-about .collapse {
  background: var(--about-marine);
  border: 1px solid rgba(192, 192, 192, 0.15);
  border-radius: 4px;
  overflow: hidden;
}

.page-about .collapse summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
  color: var(--about-white);
  list-style: none;
  user-select: none;
}

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

.page-about .collapse summary:hover {
  background: rgba(228, 0, 43, 0.08);
}

.page-about .collapse_icon {
  position: relative;
  width: 16px;
  height: 16px;
  flex: 0 0 16px;
}

.page-about .collapse_icon::before,
.page-about .collapse_icon::after {
  content: "";
  position: absolute;
  background: var(--about-red);
  transition: transform 0.3s ease;
}

.page-about .collapse_icon::before {
  left: 0;
  right: 0;
  top: 7px;
  height: 2px;
}

.page-about .collapse_icon::after {
  top: 0;
  bottom: 0;
  left: 7px;
  width: 2px;
}

.page-about .collapse[open] .collapse_icon::after {
  transform: scaleY(0);
}

.page-about .about-collapse_inner {
  padding: 4px 18px 18px;
}

.page-about .about-feature_list {
  margin: 0;
  padding-left: 20px;
  color: var(--about-light-gray);
  font-size: 14px;
  line-height: 1.85;
}

.page-about .about-feature_list li {
  padding-left: 4px;
}

.page-about .about-versions_img {
  margin: 0;
  background: var(--about-black);
  border: 1px solid rgba(192, 192, 192, 0.15);
}

.page-about .about-local {
  border-bottom: 1px solid rgba(192, 192, 192, 0.15);
}

.page-about .about-local_grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-local_content p {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--about-light-gray);
  margin: 0 0 16px;
}

.page-about .about-local_points {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-local_points li {
  padding: 10px 16px;
  background: var(--about-marine);
  border-left: 3px solid var(--about-neon);
  color: var(--about-white);
  font-size: 14px;
}

.page-about .about-local_points li .data-number {
  color: var(--about-neon);
  font-weight: 700;
}

.page-about .about-local_btn {
  margin-top: 4px;
}

.page-about .about-local_figure {
  margin: 0;
  background: var(--about-black);
  border: 1px solid rgba(192, 192, 192, 0.15);
  overflow: hidden;
}

.page-about .about-team {
  padding-bottom: 80px;
}

.page-about .about-team_intro {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--about-light-gray);
  margin: 0 0 28px;
  max-width: 36em;
}

.page-about .about-team_grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 28px;
}

.page-about .about-team_card {
  background: var(--about-marine);
  padding: 22px 22px 20px;
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(192, 192, 192, 0.12);
  border-radius: 4px;
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.page-about .about-team_card:hover {
  border-color: var(--about-red);
  transform: translateY(-3px);
}

.page-about .about-team_card-num {
  font-family: var(--about-font-mono);
  font-size: 12px;
  color: var(--about-red);
  letter-spacing: 0.2em;
  margin: 0 0 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-team_card-num::after {
  content: "";
  flex: 1;
  height: 1px;
  background: rgba(228, 0, 43, 0.3);
}

.page-about .about-team_card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--about-white);
  margin: 0 0 8px;
}

.page-about .about-team_card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-light-gray);
  margin: 0;
}

.page-about .about-team_footer {
  background: var(--about-black);
  border: 1px solid rgba(192, 192, 192, 0.15);
  border-radius: 4px;
  padding: 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-team_principles p {
  font-size: 1rem;
  font-weight: 700;
  color: var(--about-white);
  margin: 0 0 12px;
}

.page-about .about-team_principles ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-team_principles li {
  color: var(--about-light-gray);
  font-size: 14px;
  padding-left: 20px;
  position: relative;
}

.page-about .about-team_principles li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  background: var(--about-red);
  transform: rotate(45deg);
}

.page-about .about-team_cta {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
  justify-content: center;
  border-top: 1px solid rgba(192, 192, 192, 0.15);
  padding-top: 20px;
}

.page-about .about-team_cta p {
  font-size: 1rem;
  color: var(--about-silver);
  margin: 0;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  font-family: var(--about-font-body);
  text-decoration: none;
  border-radius: 4px;
  transition: transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out), background 0.25s ease;
  cursor: pointer;
  border: 1px solid transparent;
}

.page-about .btn:hover {
  transform: translateY(-2px);
}

.page-about .btn-primary {
  background: var(--about-red);
  color: var(--about-white);
  box-shadow: 0 4px 20px rgba(228, 0, 43, 0.3);
  position: relative;
  overflow: hidden;
}

.page-about .btn-primary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--about-neon);
}

.page-about .btn-primary:hover {
  background: #c50026;
  box-shadow: 0 6px 28px rgba(228, 0, 43, 0.45);
}

.page-about .btn-outline {
  background: transparent;
  border-color: var(--about-silver);
  color: var(--about-silver);
}

.page-about .btn-outline:hover {
  border-color: var(--about-red);
  color: var(--about-red);
}

.page-about .status-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--about-neon);
  box-shadow: 0 0 0 4px rgba(57, 255, 20, 0.15);
  animation: about-pulse 2s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes about-pulse {
  0%, 100% {
    box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.2), 0 0 8px rgba(57, 255, 20, 0.4);
  }
  50% {
    box-shadow: 0 0 0 6px rgba(57, 255, 20, 0.08), 0 0 2px rgba(57, 255, 20, 0.1);
  }
}

.page-about .trust-strip_text {
  font-size: 13px;
  letter-spacing: 0.04em;
}

@media (min-width: 768px) {
  .page-about .about-section {
    grid-template-columns: 160px 1fr;
    gap: 40px;
    padding: 72px 32px;
  }

  .page-about .about-col-note {
    flex-direction: column;
    gap: 8px;
    border-left: none;
    border-top: 3px solid var(--about-red);
    padding-left: 0;
    padding-top: 14px;
  }

  .page-about .about-hero {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    padding-top: 48px;
  }

  .page-about .about-hero_left {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .page-about .about-hero_right {
    justify-content: center;
    align-items: flex-start;
  }

  .page-about .about-hero_deco {
    right: 0;
  }

  .page-about .about-story_grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

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

  .page-about .about-timeline_item {
    padding-left: 92px;
  }

  .page-about .about-timeline::before {
    left: 38px;
  }

  .page-about .about-timeline_dot {
    left: 28px;
  }

  .page-about .about-versions_tablist .tab-link {
    padding: 14px 28px;
  }

  .page-about .about-local_grid {
    grid-template-columns: 1fr 0.85fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-team_grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .page-about .about-team_footer {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 32px;
    align-items: center;
    padding: 28px 32px;
  }

  .page-about .about-team_cta {
    border-top: none;
    border-left: 1px solid rgba(192, 192, 192, 0.15);
    padding-top: 0;
    padding-left: 32px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-data_grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-section {
    grid-template-columns: 180px 1fr;
    gap: 56px;
  }

  .page-about .about-hero {
    grid-template-columns: 1.1fr 1fr;
  }

  .page-about .about-heading {
    margin-bottom: 32px;
  }
}