.page-about {
  --about-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --about-serif: "Noto Serif SC", "Source Han Serif SC", serif;
  --about-sans: "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --about-neon-glow: rgba(57, 255, 20, 0.08);
  --about-blue-glow: rgba(0, 240, 255, 0.06);
  --about-orange-glow: rgba(255, 106, 0, 0.1);
  --about-diagonal: linear-gradient(135deg, transparent 0%, transparent 42%, rgba(57, 255, 20, 0.18) 43%, rgba(0, 240, 255, 0.1) 50%, transparent 51%);
  position: relative;
  background: var(--color-bg);
  overflow-x: hidden;
}

/* ================= HERO ================= */

.page-about .about-hero {
  position: relative;
  padding: 64px 0 56px;
  min-height: 640px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 82% 25%, rgba(0, 240, 255, 0.09) 0%, transparent 55%),
    radial-gradient(ellipse at 72% 72%, rgba(57, 255, 20, 0.07) 0%, transparent 48%),
    linear-gradient(120deg, rgba(255, 106, 0, 0.05) 0%, transparent 32%),
    var(--color-bg);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 58%;
  height: 100%;
  background:
    linear-gradient(rgba(57, 255, 20, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.025) 1px, transparent 1px);
  background-size: 54px 54px;
  -webkit-mask-image: linear-gradient(100deg, transparent 8%, #000 65%);
  mask-image: linear-gradient(100deg, transparent 8%, #000 65%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--color-neon) 25%, var(--color-blue) 55%, transparent 100%);
  opacity: 0.5;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-hero-copy {
  max-width: 620px;
}

.page-about .about-hero-tag {
  margin-top: 18px;
  margin-bottom: 16px;
  font-family: var(--about-mono);
  letter-spacing: 0.2em;
}

.page-about .about-hero-title {
  margin: 0 0 22px;
  font-family: var(--about-serif);
  font-weight: 900;
  font-size: clamp(32px, 5.4vw, 58px);
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--color-text);
}

.page-about .about-hero-title::after {
  content: "";
  display: block;
  width: 72px;
  height: 4px;
  margin-top: 24px;
  background: linear-gradient(135deg, var(--color-neon), var(--color-blue));
  clip-path: polygon(0 0, 100% 0, 92% 100%, 0 100%);
}

.page-about .about-hero-lead {
  margin: 0 0 28px;
  font-family: var(--about-sans);
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-muted);
  max-width: 54ch;
}

.page-about .about-hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero-visual {
  position: relative;
  min-height: 300px;
  border-radius: 4px;
  overflow: hidden;
}

.page-about .about-visual-lines {
  position: absolute;
  inset: 0;
}

.page-about .v-line {
  position: absolute;
  top: -18%;
  width: 1px;
  height: 136%;
  background: linear-gradient(to bottom, transparent, rgba(57, 255, 20, 0.4), rgba(0, 240, 255, 0.3), transparent);
  transform: skewX(-18deg);
  transform-origin: top center;
}

.page-about .vl-1 {
  left: 6%;
  height: 110%;
  background: linear-gradient(to bottom, transparent, rgba(57, 255, 20, 0.18), transparent);
  animation: aboutLineDrift 4.2s ease-in-out infinite alternate;
}

.page-about .vl-2 {
  left: 58%;
  background: linear-gradient(to bottom, transparent, rgba(0, 240, 255, 0.3), transparent);
  animation: aboutLineDrift 3.4s ease-in-out infinite alternate-reverse;
}

.page-about .vl-3 {
  left: 80%;
  height: 92%;
  background: linear-gradient(to bottom, transparent, rgba(57, 255, 20, 0.26), transparent);
  animation: aboutLineDrift 5s ease-in-out infinite alternate;
}

.page-about .vl-4 {
  left: 38%;
  height: 80%;
  top: 10%;
  background: linear-gradient(to bottom, transparent, rgba(255, 106, 0, 0.14), transparent);
  animation: aboutLineDrift 3.8s ease-in-out infinite alternate-reverse;
}

.page-about .vl-5 {
  left: 92%;
  height: 70%;
  top: 24%;
  background: linear-gradient(to bottom, transparent, rgba(0, 240, 255, 0.16), transparent);
  animation: aboutLineDrift 4.6s ease-in-out infinite alternate;
}

.page-about .about-visual-core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 140px;
  height: 140px;
  transform: translate(-50%, -50%);
}

.page-about .visual-core-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid rgba(57, 255, 20, 0.4);
}

.page-about .ring-1 {
  animation: aboutRingPulse 2.6s ease-out infinite;
}

.page-about .ring-2 {
  inset: 22px;
  border-color: rgba(0, 240, 255, 0.35);
  animation: aboutRingPulse 2.6s ease-out infinite 0.8s;
}

.page-about .visual-core-dot {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 12px;
  height: 12px;
  transform: translate(-50%, -50%);
  background: var(--color-neon);
  border-radius: 50%;
  box-shadow:
    0 0 22px rgba(57, 255, 20, 0.9),
    0 0 60px rgba(57, 255, 20, 0.4);
}

.page-about .about-visual-tag {
  position: absolute;
  right: 4%;
  bottom: 8%;
  font-family: var(--about-mono);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: rgba(230, 232, 239, 0.55);
  border-left: 2px solid rgba(57, 255, 20, 0.4);
  padding-left: 12px;
  line-height: 1.4;
}

/* ================= ORIGIN ================= */

.page-about .about-origin {
  position: relative;
  background: var(--color-bg);
}

.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-origin-side {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.page-about .about-origin-side .section-title {
  font-size: clamp(26px, 3.6vw, 38px);
}

.page-about .about-side-note {
  margin: 18px 0 0;
  font-family: var(--about-mono);
  font-size: 14px;
  color: var(--color-muted);
  letter-spacing: 0.08em;
}

.page-about .about-origin-main {
  display: grid;
  gap: 32px;
}

.page-about .about-origin-copy p {
  margin: 0 0 18px;
  font-family: var(--about-sans);
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-muted);
}

.page-about .about-lead-para {
  font-family: var(--about-serif);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.7;
  color: var(--color-text) !important;
  border-left: 3px solid var(--color-neon);
  padding-left: 18px;
  margin-bottom: 24px !important;
}

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

.page-about .about-origin-figure::before {
  content: "";
  position: absolute;
  top: -12px;
  left: -12px;
  width: 48px;
  height: 48px;
  border-top: 2px solid rgba(0, 240, 255, 0.4);
  border-left: 2px solid rgba(0, 240, 255, 0.4);
  pointer-events: none;
}

.page-about .about-origin-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}

.page-about .about-origin-figure figcaption {
  margin-top: 14px;
  font-family: var(--about-mono);
  font-size: 13px;
  color: rgba(176, 182, 195, 0.7);
  letter-spacing: 0.04em;
}

/* ================= TIMELINE ================= */

.page-about .about-timeline {
  position: relative;
  background:
    linear-gradient(180deg, transparent 0%, rgba(15, 20, 33, 0.55) 12%, rgba(15, 20, 33, 0.55) 88%, transparent 100%);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 10%;
  left: -6%;
  width: 42%;
  height: 80%;
  background:
    linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.page-about .about-timeline-head {
  text-align: left;
}

.page-about .about-timeline-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-top: 36px;
}

.page-about .about-timeline-aside {
  position: relative;
}

.page-about .about-timeline-visual {
  margin: 0;
  position: relative;
}

.page-about .about-timeline-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 55%, rgba(57, 255, 20, 0.08) 100%);
  pointer-events: none;
}

.page-about .about-timeline-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  clip-path: polygon(24px 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%, 0 24px);
  opacity: 0.9;
}

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

.page-about .about-timeline-list::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 24px;
  left: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-neon), var(--color-blue) 70%, transparent);
  opacity: 0.35;
}

.page-about .tl-item {
  position: relative;
  padding-left: 40px;
  padding-bottom: 32px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 18px;
  width: 14px;
  height: 14px;
  background: var(--color-bg-alt);
  border: 2px solid var(--color-neon);
  transform: rotate(45deg);
  z-index: 1;
  box-shadow: 0 0 10px rgba(57, 255, 20, 0.35);
}

.page-about .tl-card {
  background: rgba(15, 20, 33, 0.85);
  padding: 24px 22px 20px;
  border: 1px solid rgba(230, 232, 239, 0.07);
  transition: border-color 0.3s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.page-about .tl-card:hover {
  border-color: rgba(57, 255, 20, 0.35);
  box-shadow: inset 0 1px 0 rgba(57, 255, 20, 0.08), 0 12px 28px rgba(0, 0, 0, 0.22);
}

.page-about .tl-year-num {
  display: inline-block;
  font-family: var(--about-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-neon);
  background: rgba(57, 255, 20, 0.08);
  border: 1px solid rgba(57, 255, 20, 0.22);
  padding: 3px 12px;
  margin-bottom: 12px;
}

.page-about .tl-card h3 {
  margin: 0 0 10px;
  font-family: var(--about-serif);
  font-size: 19px;
  font-weight: 700;
  color: var(--color-text);
}

.page-about .tl-card p {
  margin: 0 0 14px;
  font-family: var(--about-sans);
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-muted);
}

.page-about .tl-tag {
  display: inline-block;
  font-family: var(--about-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--color-blue);
  border-bottom: 1px dashed rgba(0, 240, 255, 0.35);
  padding-bottom: 2px;
}

/* ================= MISSION ================= */

.page-about .about-mission {
  position: relative;
}

.page-about .about-mission-head {
  max-width: 640px;
}

.page-about .about-mission-quote {
  margin: 16px 0 0;
  font-family: var(--about-serif);
  font-weight: 700;
  font-size: clamp(20px, 2.8vw, 28px);
  color: transparent;
  background: linear-gradient(135deg, var(--color-neon), var(--color-blue));
  -webkit-background-clip: text;
  background-clip: text;
}

.page-about .about-mission-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 36px;
}

.page-about .mission-card {
  position: relative;
  background: var(--color-bg-alt);
  padding: 32px 26px 28px;
  border: 1px solid rgba(230, 232, 239, 0.06);
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.3s;
}

.page-about .mission-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 240, 255, 0.3);
}

.page-about .mission-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-neon), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s;
}

.page-about .mission-card:hover::before {
  opacity: 1;
}

.page-about .mission-card-num {
  display: block;
  font-family: var(--about-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-orange);
  letter-spacing: 0.14em;
  margin-bottom: 14px;
}

.page-about .mission-card h3 {
  margin: 0 0 12px;
  font-family: var(--about-serif);
  font-size: 24px;
  font-weight: 900;
  color: var(--color-text);
}

.page-about .mission-card p {
  margin: 0;
  font-family: var(--about-sans);
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-muted);
}

/* ================= TEAM ================= */

.page-about .about-team {
  position: relative;
  background:
    radial-gradient(ellipse at 18% 40%, rgba(0, 240, 255, 0.045) 0%, transparent 55%),
    var(--color-bg);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

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

.page-about .about-team-figure::after {
  content: "";
  position: absolute;
  right: -10px;
  bottom: -10px;
  width: 36%;
  height: 36%;
  border-right: 2px solid rgba(255, 106, 0, 0.3);
  border-bottom: 2px solid rgba(255, 106, 0, 0.3);
  pointer-events: none;
}

.page-about .about-team-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-team-content {
  max-width: 600px;
}

.page-about .about-team-content .section-title {
  margin-bottom: 20px;
}

.page-about .about-team-copy p {
  margin: 0 0 16px;
  font-family: var(--about-sans);
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-muted);
}

.page-about .about-team-copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-team-stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 16px;
}

.page-about .about-team-stats li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--about-mono);
  font-size: 13px;
  color: var(--color-muted);
  background: rgba(15, 20, 33, 0.6);
  border: 1px solid rgba(230, 232, 239, 0.05);
  padding: 10px 12px;
  border-radius: 2px;
}

.page-about .about-team-link {
  margin-top: 28px;
}

/* ================= VISION ================= */

.page-about .about-vision {
  position: relative;
  padding-bottom: 100px;
}

.page-about .about-vision-panel {
  position: relative;
  background: var(--color-bg-alt);
  border: 1px solid rgba(57, 255, 20, 0.12);
  padding: 56px 28px 44px;
  text-align: center;
  overflow: hidden;
}

.page-about .about-vision-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-neon) 35%, var(--color-blue) 65%, transparent);
}

.page-about .about-vision-panel::after {
  content: "";
  position: absolute;
  bottom: -60px;
  left: 50%;
  width: 260px;
  height: 260px;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(57, 255, 20, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-vision-panel .section-tag {
  margin-bottom: 14px;
}

.page-about .about-vision-copy {
  max-width: 640px;
  margin: 20px auto 32px;
  font-family: var(--about-sans);
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-muted);
}

.page-about .about-vision-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  align-items: center;
}

.page-about .about-vision-link {
  font-family: var(--about-sans);
  font-size: 14px;
  color: var(--color-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 240, 255, 0.4);
  padding-bottom: 3px;
  transition: color 0.25s, border-color 0.25s;
}

.page-about .about-vision-link:hover {
  color: var(--color-neon);
  border-color: var(--color-neon);
}

/* ================= ANIMATIONS ================= */

@keyframes aboutLineDrift {
  0% {
    opacity: 0.35;
    transform: skewX(-18deg) translateY(-6%);
  }
  100% {
    opacity: 0.85;
    transform: skewX(-18deg) translateY(6%);
  }
}

@keyframes aboutRingPulse {
  0% {
    transform: scale(0.82);
    opacity: 0.75;
  }
  100% {
    transform: scale(1.18);
    opacity: 0;
  }
}

/* ================= REDUCED MOTION ================= */

@media (prefers-reduced-motion: reduce) {
  .page-about .v-line,
  .page-about .visual-core-ring {
    animation: none !important;
  }

  .page-about .tl-card:hover,
  .page-about .mission-card:hover {
    transform: none;
  }
}

/* ================= TABLET (≥640px) ================= */

@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 88px 0 72px;
  }

  .page-about .about-origin-main {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
    align-items: start;
  }

  .page-about .about-origin-copy {
    grid-column: 1 / -1;
  }

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

  .page-about .about-team-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-vision-panel {
    padding: 68px 48px 52px;
  }
}

/* ================= DESKTOP (≥1024px) ================= */

@media (min-width: 1024px) {
  .page-about .about-hero {
    min-height: 720px;
    padding: 0;
  }

  .page-about .about-hero-inner {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-hero-copy {
    max-width: 640px;
  }

  .page-about .about-hero-visual {
    min-height: 560px;
  }

  /* Origin — 展览画册式左留白 */
  .page-about .about-origin {
    padding-top: 120px;
    padding-bottom: 120px;
  }

  .page-about .about-origin-grid {
    grid-template-columns: 4fr 7fr;
    gap: 72px;
    padding-left: 4%;
  }

  .page-about .about-origin-side {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-origin-main {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .page-about .about-origin-copy {
    max-width: 620px;
  }

  .page-about .about-origin-figure {
    max-width: 600px;
  }

  /* Timeline */
  .page-about .about-timeline {
    padding-top: 100px;
    padding-bottom: 120px;
  }

  .page-about .about-timeline-head {
    padding-left: 38%;
  }

  .page-about .about-timeline-head .section-sub {
    max-width: 46ch;
  }

  .page-about .about-timeline-grid {
    grid-template-columns: 38% 62%;
    gap: 64px;
    align-items: start;
    margin-top: 48px;
  }

  .page-about .about-timeline-aside {
    position: sticky;
    top: 96px;
  }

  .page-about .about-timeline-scroll {
    padding-right: 4%;
  }

  .page-about .tl-card {
    padding: 28px 26px 24px;
  }

  /* Mission */
  .page-about .about-mission {
    padding-top: 100px;
    padding-bottom: 100px;
  }

  .page-about .about-mission-head {
    padding-left: 22%;
  }

  .page-about .about-mission-grid {
    margin-top: 52px;
  }

  .page-about .mission-card {
    padding: 40px 30px 32px;
  }

  /* Team */
  .page-about .about-team {
    padding-top: 100px;
    padding-bottom: 100px;
  }

  .page-about .about-team-grid {
    grid-template-columns: 1fr 1fr;
    gap: 72px;
  }

  .page-about .about-team-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Vision */
  .page-about .about-vision {
    padding-top: 80px;
    padding-bottom: 120px;
  }

  .page-about .about-vision-panel {
    padding: 80px 60px 56px;
  }
}

/* ================= WIDE DESKTOP (≥1280px) ================= */

@media (min-width: 1280px) {
  .page-about .about-hero-inner {
    gap: 72px;
  }

  .page-about .about-origin-grid {
    grid-template-columns: 3.5fr 7fr;
    gap: 88px;
    padding-left: 2%;
  }

  .page-about .about-timeline-grid {
    grid-template-columns: 36% 64%;
    gap: 80px;
  }

  .page-about .about-team-grid {
    gap: 88px;
  }

  .page-about .about-vision-panel {
    padding-left: 80px;
    padding-right: 80px;
  }
}