.page-about {
  --about-gap: 24px;
  --about-line: 3px;
  --about-num-size: 4.5rem;
  --about-hero-primary: rgba(255, 30, 30, 0.92);
  background: var(--c-white);
  overflow-x: hidden;
}

/* ===== Hero 框景首屏 ===== */
.page-about .about-hero {
  position: relative;
  padding: 96px 0 72px;
  color: var(--c-white);
  background: linear-gradient(135deg, var(--c-black) 0%, #2a0a0a 58%, var(--c-red-dark) 130%);
  border-bottom: 6px solid var(--c-red);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 8px;
  height: 100%;
  background: var(--c-red);
  opacity: 0.9;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 42%;
  height: 6px;
  background: linear-gradient(to left, var(--c-blue-bright), transparent);
  opacity: 0.6;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 48px;
  color: rgba(255, 255, 255, 0.7);
}

.page-about .about-hero .breadcrumbs a {
  color: var(--c-blue-bright);
  text-decoration: none;
}

.page-about .about-hero .breadcrumbs a:hover {
  color: var(--c-red-pale);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

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

.page-about .about-hero__content .section-label {
  display: inline-block;
  margin-bottom: 18px;
  padding: 6px 14px;
  color: var(--c-white);
  background: var(--c-red-dark);
  font-family: var(--font-display);
  letter-spacing: 0.04em;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

.page-about .about-hero__content h1 {
  margin: 0 0 24px;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4.6vw, 3.2rem);
  line-height: 1.14;
  text-transform: uppercase;
  font-style: italic;
  letter-spacing: -0.01em;
  text-shadow: 0 4px 28px rgba(255, 30, 30, 0.18);
}

.page-about .about-hero__lead {
  max-width: 640px;
  margin: 0 0 32px;
  color: rgba(255, 255, 255, 0.84);
  font-size: 1.08rem;
  line-height: 1.8;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.page-about .about-hero__panel {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 28px;
  margin: 0;
  padding: 40px 32px 32px;
  border: 1px solid rgba(192, 192, 192, 0.35);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.08), rgba(179, 0, 0, 0.12));
  backdrop-filter: blur(8px);
  border-radius: var(--radius);
  overflow: hidden;
  min-height: 280px;
}

.page-about .about-hero__panel::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--c-red), var(--c-blue-bright));
}

.page-about .about-hero__stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 8px;
  border-left: 2px solid var(--c-red);
}

.page-about .about-hero__stat-num {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1;
  color: var(--c-white);
  white-space: nowrap;
}

.page-about .about-hero__stat-label {
  color: var(--c-silver);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}

.page-about .about-hero__scale {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 44px;
  margin-top: auto;
}

.page-about .about-hero__scale span {
  display: block;
  flex: 1;
  background: var(--c-blue-bright);
  opacity: 0.72;
  height: 100%;
  clip-path: polygon(0 64%, 100% 30%, 100% 100%, 0 100%);
}

.page-about .about-hero__scale span:nth-child(2) {
  height: 72%;
  background: var(--c-red);
}

.page-about .about-hero__scale span:nth-child(3) {
  height: 56%;
  background: var(--c-silver);
}

.page-about .about-hero__scale span:nth-child(4) {
  height: 80%;
  background: var(--c-red-pale);
}

.page-about .about-hero__scale span:nth-child(5) {
  height: 48%;
  opacity: 0.9;
}

.page-about .about-hero__note {
  margin: 0;
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ===== 章节通用 ===== */
.page-about .chapter {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 40px;
}

.page-about .chapter-num {
  display: inline-flex;
  align-items: flex-start;
  font-family: var(--font-display);
  font-size: var(--about-num-size);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 2px var(--c-red);
  font-style: italic;
  user-select: none;
}

.page-about .chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vmax, 2.4rem);
  line-height: 1.2;
  color: var(--c-black);
  text-transform: uppercase;
  font-style: italic;
}

.page-about .chapter-desc {
  margin: 0;
  color: #6f6f6f;
  font-size: 1rem;
  line-height: 1.7;
}

.page-about .section-dark .chapter-title {
  color: var(--c-white);
}

.page-about .section-dark .chapter-desc {
  color: rgba(255, 255, 255, 0.65);
}

/* ===== 使命 ===== */
.page-about .about-mission__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: stretch;
}

.page-about .about-mission__media .media-box {
  display: block;
  height: 100%;
  min-height: 260px;
}

.page-about .about-mission__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
  border-radius: var(--radius);
}

.page-about .about-mission__content .glass-card {
  height: 100%;
  padding: 36px 32px;
  background: rgba(255, 30, 30, 0.04);
  border: 1px solid rgba(0, 51, 102, 0.15);
  border-left: 5px solid var(--c-red);
  backdrop-filter: blur(4px);
  border-radius: var(--radius);
  box-shadow: 0 12px 36px rgba(26, 26, 26, 0.06);
}

.page-about .about-mission__content p {
  margin: 0 0 18px;
  color: #2f2f2f;
  line-height: 1.85;
}

.page-about .about-mission__content .text-link {
  display: inline-block;
  margin-top: 8px;
  color: var(--c-blue);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--c-blue-bright);
  padding-bottom: 2px;
}

.page-about .about-mission__content .text-link:hover {
  color: var(--c-red);
}

/* ===== 时间轴 ===== */
.page-about .section-dark.about-timeline {
  background: linear-gradient(180deg, var(--c-black) 0%, #0d1b2a 100%);
  border-top: 2px solid var(--c-red);
  border-bottom: 2px solid var(--c-red);
}

.page-about .about-timeline__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

.page-about .about-timeline__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 6px;
  width: var(--about-line);
  background: linear-gradient(180deg, var(--c-red), var(--c-blue-bright));
  border-radius: 99px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 6px;
  left: -28px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--c-black);
  border: 3px solid var(--c-red);
  box-shadow: 0 0 0 4px rgba(255, 30, 30, 0.22);
}

.page-about .about-timeline__year {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--c-red-pale);
  font-style: italic;
  margin-bottom: 10px;
}

.page-about .about-timeline__card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(192, 192, 192, 0.2);
  border-left: 4px solid var(--c-blue-bright);
  border-radius: 8px;
  transition: transform var(--speed) var(--ease-out), background var(--speed) var(--ease-out);
}

.page-about .about-timeline__card:hover {
  background: rgba(255, 30, 30, 0.08);
  transform: translateX(8px);
}

.page-about .about-timeline__card .card-title {
  color: var(--c-white);
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-style: italic;
}

.page-about .about-timeline__card .card-text {
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.75;
}

.page-about .about-timeline__visual {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-timeline__visual .media-box {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid rgba(192, 192, 192, 0.3);
}

.page-about .about-timeline__visual img {
  width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.page-about .about-timeline__visual:hover img {
  transform: scale(1.02);
}

.page-about .about-timeline__caption {
  margin: 0;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ===== 回访页 ===== */
.page-about .about-revisit {
  background: var(--c-white);
}

.page-about .about-revisit__intro {
  max-width: 780px;
  margin: 0 auto 40px;
  padding: 0 16px;
  color: #333;
  font-size: 1.08rem;
  line-height: 1.9;
  border-left: 5px solid var(--c-red);
  padding-left: 24px;
}

.page-about .about-revisit__features {
  gap: 20px;
  margin-bottom: 48px;
}

.page-about .about-revisit__feature {
  position: relative;
  background: #fafafa;
  border: 1px solid #ececec;
  border-top: 4px solid var(--c-red-dark);
  transition: box-shadow var(--speed) var(--ease-out), transform var(--speed) var(--ease-out);
}

.page-about .about-revisit__feature:hover {
  box-shadow: 0 16px 32px rgba(179, 0, 0, 0.12);
  transform: translateY(-4px);
}

.page-about .about-revisit__detail {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.page-about .about-revisit__media {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid #e5e5e5;
}

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

.page-about .about-revisit__description p {
  margin: 0 0 24px;
  color: #2f2f2f;
  line-height: 1.85;
}

/* ===== 数据能力 ===== */
.page-about .about-data {
  background: radial-gradient(circle at 80% 20%, rgba(0, 174, 239, 0.12), transparent 40%),
    linear-gradient(180deg, #0f1626 0%, #1a1a1a 100%);
  border-top: 2px solid var(--c-blue-bright);
  border-bottom: 2px solid var(--c-blue-bright);
}

.page-about .about-data__filter {
  margin-bottom: 32px;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-data__filter .filter-btn {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.05);
  color: rgba(255, 255, 255, 0.75);
  font-family: var(--font-body);
  font-size: 0.92rem;
  line-height: 1;
  padding: 10px 18px;
  border-radius: 999px;
  cursor: pointer;
  transition: all var(--speed) var(--ease-out);
}

.page-about .about-data__filter .filter-btn:hover {
  background: rgba(255, 30, 30, 0.2);
  border-color: var(--c-red-pale);
  color: var(--c-white);
}

.page-about .about-data__filter .filter-btn[data-active="true"] {
  background: var(--c-red);
  border-color: var(--c-red);
  color: var(--c-white);
  font-weight: 700;
}

.page-about .about-data__grid {
  gap: 20px;
}

.page-about .about-data__card {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(192, 192, 192, 0.2);
  border-left: 4px solid var(--c-red);
  border-radius: 8px;
  transition: background var(--speed) var(--ease-out), transform var(--speed) var(--ease-out);
  backdrop-filter: blur(4px);
}

.page-about .about-data__card:hover {
  background: rgba(255, 30, 30, 0.1);
  transform: translateY(-2px);
}

.page-about .about-data__card .card-title {
  color: var(--c-white);
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-style: italic;
  line-height: 1.3;
}

.page-about .about-data__card .card-text {
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.75;
}

.page-about .about-data__card[data-filtered="false"] {
  display: none;
}

/* ===== 用户承诺 ===== */
.page-about .about-promise {
  background: #fafafa;
}

.page-about .about-promise__grid {
  gap: 20px;
  margin-bottom: 36px;
}

.page-about .about-promise__card {
  background: var(--c-white);
  border: 1px solid #efefef;
  border-bottom: 5px solid var(--c-blue);
  text-align: left;
  transition: box-shadow var(--speed) var(--ease-out), transform var(--speed) var(--ease-out);
}

.page-about .about-promise__card:hover {
  box-shadow: 0 18px 36px rgba(0, 51, 102, 0.1);
  transform: translateY(-4px);
}

.page-about .about-promise__card .card-title {
  color: var(--c-black);
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-style: italic;
  text-transform: uppercase;
}

.page-about .about-promise__card .card-text {
  color: #555;
  line-height: 1.8;
}

.page-about .about-promise__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

/* ===== 响应式 ===== */
@media (min-width: 768px) {
  .page-about {
    --about-gap: 32px;
    --about-num-size: 5.5rem;
  }

  .page-about .about-hero {
    padding: 120px 0 88px;
  }

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

  .page-about .about-hero__content h1 {
    font-size: clamp(2.4rem, 4.8vw, 4rem);
  }

  .page-about .chapter {
    flex-direction: row;
    gap: 24px;
    align-items: flex-start;
  }

  .page-about .chapter-num {
    flex: 0 0 auto;
  }

  .page-about .about-mission__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
  }

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

  .page-about .about-timeline__item::before {
    left: -34px;
  }

  .page-about .about-timeline__list {
    padding-left: 36px;
  }

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

  .page-about .about-revisit__media {
    margin: 0;
  }

  .page-about .about-data__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

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