.page-about {
  --about-red-glow: rgba(212, 0, 0, 0.35);
  --about-gold-glow: rgba(255, 199, 0, 0.12);
  --about-panel-line: rgba(255, 255, 255, 0.08);
  overflow-x: hidden;
}

/* ===== Hero ===== */
.page-about .about-hero {
  position: relative;
  padding: 2.5rem 0 1.5rem;
  background:
    radial-gradient(ellipse at 78% 18%, rgba(212, 0, 0, 0.22), transparent 55%),
    var(--color-black);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(-45deg, transparent 0 14px, rgba(255, 255, 255, 0.014) 14px 15px);
  pointer-events: none;
}

.page-about .about-hero-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.page-about .about-hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.24em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}

.page-about .about-hero-kicker::before {
  content: "";
  width: 2.5rem;
  height: 2px;
  background: var(--color-red);
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  line-height: 1.12;
  color: var(--color-white);
  margin: 0 0 1.5rem;
}

.page-about .about-hero h1::first-line {
  color: var(--color-red);
}

.page-about .about-hero-lead {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--color-gray);
  max-width: 34rem;
  margin: 0;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .about-hero-actions .btn {
  min-width: 150px;
}

/* ===== 徽章 ===== */
.page-about .about-hero-emblem {
  display: flex;
  justify-content: center;
  position: relative;
}

.page-about .about-emblem-badge {
  position: relative;
  width: min(300px, 78vw);
  aspect-ratio: 1;
  transform: rotate(6deg);
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid rgba(212, 0, 0, 0.5);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.45), 0 0 60px var(--about-red-glow);
  background: var(--color-panel);
}

.page-about .about-emblem-badge::after {
  content: "";
  position: absolute;
  top: 12%;
  left: -10%;
  width: 120%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-red), transparent);
  transform: rotate(-8deg);
}

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

/* ===== 档案标签导航 ===== */
.page-about .about-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  align-items: flex-end;
  margin-top: 2.75rem;
  padding-bottom: 0.25rem;
  border-bottom: 3px solid rgba(212, 0, 0, 0.4);
  position: relative;
  z-index: 1;
}

.page-about .about-tab {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-data);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--color-gray);
  text-decoration: none;
  padding: 0.6rem 0.9rem 0.45rem;
  background: var(--color-panel);
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 10px 10px 0 0;
  transition: all var(--speed-fast) var(--ease-out);
}

.page-about .about-tab:hover,
.page-about .about-tab:focus {
  color: var(--color-white);
  background: rgba(212, 0, 0, 0.18);
  border-color: rgba(212, 0, 0, 0.35);
  transform: translateY(-3px);
}

/* ===== 章节标题通用 ===== */
.page-about .about-section-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 2.5rem;
  position: relative;
}

.page-about .about-section-head::after {
  content: "";
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, var(--color-red), transparent);
}

.page-about .about-section-head .section-number {
  font-family: var(--font-data);
  font-size: 1.1rem;
  color: var(--color-gold);
  font-weight: 700;
}

.page-about .about-section-head .section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 900;
  color: var(--color-white);
  margin: 0;
  line-height: 1.2;
}

/* ===== 01 品牌定义 ===== */
.page-about .about-define {
  position: relative;
  background: var(--color-black);
}

.page-about .about-define-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about .about-define-card {
  padding: 1.75rem;
  position: relative;
  border-left: 4px solid var(--color-red);
  transition: transform var(--speed-med) var(--ease-out), box-shadow var(--speed-med) var(--ease-out);
}

.page-about .about-define-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 44px rgba(0, 0, 0, 0.45);
}

.page-about .about-define-card h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  margin: 0 0 0.75rem;
}

.page-about .about-define-card p {
  color: var(--color-gray);
  line-height: 1.75;
  margin: 0 0 0.75rem;
  font-size: 0.98rem;
}

.page-about .about-define-card p:last-child {
  margin-bottom: 0;
}

.page-about .about-define-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.page-about .about-define-list li {
  padding-left: 1.4rem;
  position: relative;
  color: var(--color-white);
  font-size: 0.95rem;
}

.page-about .about-define-list li::before {
  content: "●";
  position: absolute;
  left: 0;
  color: var(--color-red);
  font-size: 0.6rem;
  top: 0.35em;
}

.page-about .about-statement {
  margin: 2.25rem 0 0;
  padding: 1.5rem 1.75rem;
  background: rgba(139, 0, 0, 0.2);
  border-left: 4px solid var(--color-gold);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.page-about .about-statement p {
  color: var(--color-white);
  font-size: 1.05rem;
  line-height: 1.8;
  margin: 0;
}

/* ===== 02 数据规模 ===== */
.page-about .about-data {
  position: relative;
  background: var(--color-black);
}

.page-about .about-data::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 38%;
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--color-deep-red), var(--color-red));
}

.page-about .about-data::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 120px;
  background: repeating-linear-gradient(-45deg, transparent 0 20px, rgba(255, 68, 68, 0.05) 20px 22px, transparent 22px 40px);
  pointer-events: none;
}

.page-about .about-data-overview {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  position: relative;
  z-index: 1;
}

.page-about .about-data-intro p {
  color: var(--color-gray);
  line-height: 1.8;
  margin: 0 0 1rem;
  font-size: 1rem;
}

.page-about .about-data-intro p:last-child {
  margin-bottom: 0;
}

.page-about .about-data-stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.page-about .about-data-stats::before {
  content: "DATI";
  position: absolute;
  top: -16px;
  right: 0;
  font-family: var(--font-data);
  font-weight: 900;
  font-size: clamp(3.5rem, 9vw, 6rem);
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.035);
  line-height: 1;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-stat {
  position: relative;
  padding: 1.25rem 0.75rem;
  background: var(--color-panel);
  border-radius: var(--radius-small);
  text-align: center;
  border-bottom: 3px solid var(--color-red);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--color-gold);
  line-height: 1.1;
}

.page-about .about-stat-unit {
  display: block;
  font-size: 0.78rem;
  color: var(--color-gray);
  margin-top: 0.35rem;
  letter-spacing: 0.06em;
}

.page-about .about-data-figure {
  margin: 2.5rem 0 0;
  position: relative;
  z-index: 1;
}

.page-about .about-data-figure img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-card);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
  display: block;
}

.page-about .about-data-figure figcaption {
  font-size: 0.84rem;
  color: var(--color-gray);
  margin-top: 0.75rem;
  padding-left: 1rem;
  border-left: 3px solid var(--color-gold);
}

.page-about .about-cat-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-top: 2.5rem;
}

.page-about .about-cat-card {
  padding: 1.4rem 1.2rem;
  background: var(--color-panel);
  transition: transform var(--speed-fast) var(--ease-out), background var(--speed-fast) var(--ease-out);
}

.page-about .about-cat-card:hover {
  transform: rotate(-1deg) translateY(-3px);
  background: #202020;
}

.page-about .about-cat-card p {
  color: var(--color-gray);
  font-size: 0.92rem;
  line-height: 1.65;
  margin: 0.75rem 0 0;
}

/* ===== 03 更新机制 ===== */
.page-about .about-update {
  background: var(--color-black);
  position: relative;
}

.page-about .about-update::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--color-red), transparent 60%, var(--color-gold));
  opacity: 0.5;
}

.page-about .about-update-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  position: relative;
  z-index: 1;
}

.page-about .about-update-card {
  padding: 1.75rem;
  background: var(--color-panel);
  border-radius: var(--radius-card);
  position: relative;
  overflow: hidden;
  transition: transform var(--speed-med) var(--ease-out), box-shadow var(--speed-med) var(--ease-out);
}

.page-about .about-update-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.4);
}

.page-about .about-update-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--color-red);
}

.page-about .about-update-card h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  margin: 0 0 0.5rem;
}

.page-about .about-update-time {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--color-gold);
  background: rgba(255, 199, 0, 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  margin: 0 0 0.75rem;
}

.page-about .about-update-card p:last-child {
  color: var(--color-gray);
  line-height: 1.7;
  margin: 0;
  font-size: 0.95rem;
}

.page-about .about-update-visual {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.page-about .about-update-visual img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius-card);
  box-shadow: 0 16px 50px rgba(0, 0, 0, 0.4);
}

/* ===== 04 发展历程 ===== */
.page-about .about-timeline {
  position: relative;
  background: var(--color-black);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-deep-red), var(--color-red), var(--color-gold));
  opacity: 0.6;
}

.page-about .about-timeline-intro {
  color: var(--color-gray);
  font-size: 1rem;
  margin: 0 0 2rem;
  max-width: 32rem;
  line-height: 1.7;
}

.page-about .about-timeline-track {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.6rem;
  overflow-x: auto;
  padding: 1.5rem 0.25rem;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: rgba(212, 0, 0, 0.6) transparent;
}

.page-about .about-timeline-card {
  flex: 0 0 250px;
  scroll-snap-align: center;
  transform: rotate(-2deg);
  padding: 1.5rem;
  background: var(--color-panel);
  border-radius: var(--radius-card);
  position: relative;
  transition: transform var(--speed-med) var(--ease-out), box-shadow var(--speed-med) var(--ease-out);
}

.page-about .about-timeline-card:nth-child(odd) {
  transform: rotate(2deg) translateY(8px);
}

.page-about .about-timeline-card:hover {
  transform: rotate(0deg) translateY(-5px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45), 0 0 24px rgba(212, 0, 0, 0.14);
}

.page-about .about-version {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.4rem;
  height: 3.4rem;
  background: var(--color-red);
  color: var(--color-white);
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 1.1rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
  transform: rotate(-6deg);
  box-shadow: 0 6px 18px rgba(212, 0, 0, 0.3);
}

.page-about .about-version--current {
  background: var(--color-gold);
  color: var(--color-black);
}

.page-about .about-timeline-card:nth-child(3) .about-version {
  background: var(--color-gold);
  color: var(--color-black);
}

.page-about .about-timeline-card h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-white);
  margin: 0 0 0.6rem;
}

.page-about .about-timeline-card p {
  color: var(--color-gray);
  font-size: 0.9rem;
  line-height: 1.65;
  margin: 0 0 0.75rem;
}

.page-about .about-timeline-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.page-about .about-timeline-list li {
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-gold);
  border: 1px solid rgba(255, 199, 0, 0.3);
  border-radius: var(--radius-pill);
  padding: 0.2rem 0.6rem;
  background: rgba(255, 199, 0, 0.06);
}

.page-about .about-timeline-arrow {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-red);
  font-size: 1.6rem;
  font-weight: 300;
  opacity: 0.55;
  user-select: none;
}

/* ===== 继续串门 ===== */
.page-about .about-next {
  position: relative;
  background: var(--color-black);
}

.page-about .about-next::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-deep-red), var(--color-red), transparent);
  opacity: 0.7;
}

.page-about .about-next-head {
  margin-bottom: 2rem;
}

.page-about .about-next-head h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 900;
  color: var(--color-white);
  margin: 0 0 0.5rem;
}

.page-about .about-next-head p {
  color: var(--color-gray);
  margin: 0;
}

.page-about .about-next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .about-next-card {
  display: block;
  padding: 1.5rem;
  text-decoration: none;
  border-left: 4px solid var(--color-red);
  transition: transform var(--speed-med) var(--ease-out), border-color var(--speed-fast) var(--ease-out), background var(--speed-fast) var(--ease-out);
}

.page-about .about-next-card:hover {
  transform: translateX(6px);
  border-left-color: var(--color-gold);
  background: #202020;
}

.page-about .about-next-index {
  display: block;
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-gray);
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.page-about .about-next-card h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-white);
  margin: 0 0 0.4rem;
}

.page-about .about-next-card p {
  color: var(--color-gray);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
}

/* ===== 响应式桌面 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 3rem 0 2rem;
  }

  .page-about .about-hero-layout {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 3rem;
  }

  .page-about .about-tabs {
    margin-top: 3.5rem;
    gap: 0.4rem;
  }

  .page-about .about-tab {
    font-size: 0.82rem;
    padding: 0.75rem 1.2rem 0.5rem;
  }

  .page-about .about-define-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .page-about .about-define-card:nth-child(2) {
    transform: rotate(2deg) translateY(18px);
  }

  .page-about .about-define-card:nth-child(2):hover {
    transform: rotate(0deg) translateY(10px);
  }

  .page-about .about-data-overview {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }

  .page-about .about-data-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
  }

  .page-about .about-cat-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
  }

  .page-about .about-update-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  .page-about .about-update-visual {
    justify-content: flex-end;
    margin-top: 2.5rem;
  }

  .page-about .about-update-visual img {
    width: min(100%, 420px);
  }

  .page-about .about-timeline-track {
    gap: 1rem;
    padding: 2rem 0.5rem;
  }

  .page-about .about-timeline-card {
    flex: 0 0 320px;
    padding: 1.75rem;
  }

  .page-about .about-next-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .page-about .about-update {
    padding-bottom: 5rem;
  }

  .page-about .about-update-visual img {
    max-width: 480px;
  }
}