/* ============ PAGE: ABOUT / 品牌故事 ============ */
.page-about {
  --ab-accent-soft: rgba(212, 255, 0, 0.08);
  --ab-accent-mist: rgba(212, 255, 0, 0.15);
  --ab-line-soft: rgba(255, 255, 255, 0.16);
  --ab-on-dark-sub: rgba(255, 255, 255, 0.78);
  --ab-card-bg: rgba(255, 255, 255, 0.04);
  overflow-x: hidden;
}

/* ---- HERO ---- */
.page-about .about-hero {
  position: relative;
  background: linear-gradient(130deg, var(--bg-deep) 0%, var(--bg-deep-2) 100%);
  color: var(--text-on-dark);
  padding: 2rem 0 3rem;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  width: min(70vw, 560px);
  height: min(70vw, 560px);
  border-radius: 50%;
  background: radial-gradient(circle, var(--ab-accent-soft), transparent 70%);
  top: -8rem;
  right: -8rem;
  pointer-events: none;
}

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

.page-about .about-hero__topline {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.page-about .about-hero__note {
  display: none;
  color: rgba(255, 255, 255, 0.5);
}

.page-about .about-hero__body {
  display: grid;
  gap: 2rem;
}

.page-about .about-hero__eyebrow {
  color: var(--accent);
  margin-bottom: 0.9rem;
}

.page-about .about-hero__title {
  font-size: clamp(2.6rem, 8vw, 5.2rem);
  line-height: 1.02;
  letter-spacing: -0.015em;
  margin: 0 0 1.25rem;
}

.page-about .about-hero__intro {
  max-width: 36em;
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--ab-on-dark-sub);
  margin: 0;
}

.page-about .about-hero__index {
  display: grid;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.page-about .about-hero__index-label {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
}

.page-about .chapter-card {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1rem;
  border-radius: 0.9rem;
  color: var(--text-on-dark);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid transparent;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .chapter-card:hover {
  background: rgba(212, 255, 0, 0.07);
  border-color: var(--ab-accent-mist);
  transform: translateX(4px);
}

.page-about .chapter-card__index {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--accent);
}

.page-about .chapter-card__title {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.85);
}

.page-about .chapter-card:hover .chapter-card__title {
  color: var(--text-on-dark);
}

.page-about .about-hero .breadcrumb__link {
  color: rgba(255, 255, 255, 0.65);
}

.page-about .about-hero .breadcrumb__link:hover {
  color: var(--accent);
}

.page-about .about-hero .breadcrumb__item[aria-current="page"] {
  color: var(--accent);
}

/* ---- SECTION 01: ORIGIN ---- */
.page-about .about-origin {
  position: relative;
  background: var(--page-bg);
  padding: clamp(3rem, 8vw, 7rem) 0;
  overflow: hidden;
}

.page-about .about-origin__grid {
  display: grid;
  gap: 2.25rem;
}

.page-about .about-origin__marker {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.page-about .about-origin__num {
  font-family: var(--font-mono);
  font-size: 4.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--bg-deep);
  opacity: 0.14;
  letter-spacing: -0.04em;
}

.page-about .about-origin__line {
  width: 4.5rem;
  height: 2px;
  background: var(--accent);
  margin-top: 2.1rem;
}

.page-about .about-origin__marker-text {
  margin-top: 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--line-light);
  border-radius: 999px;
  color: var(--text-muted);
}

.page-about .about-origin__content {
  max-width: 50rem;
}

.page-about .about-origin__title {
  font-size: clamp(2.1rem, 4.5vw, 3.4rem);
  line-height: 1.12;
  margin: 0.5rem 0 1.25rem;
}

.page-about .about-origin__lead {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--bg-deep);
  border-left: 4px solid var(--accent);
  padding-left: 1.1rem;
  margin: 0 0 1.5rem;
}

.page-about .about-origin__content p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-main);
  margin: 0 0 1.1rem;
  max-width: 42em;
}

.page-about .about-origin__aside {
  background: var(--bg-mist);
  border-radius: 1.5rem;
  padding: 2rem 1.75rem;
  position: relative;
  overflow: hidden;
}

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

.page-about .about-origin__quote-mark {
  font-family: var(--font-display);
  font-size: 4rem;
  color: var(--accent-dim);
  line-height: 0.6;
  display: block;
  height: 2rem;
  margin-bottom: 0.4rem;
}

.page-about .about-origin__quote p {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--bg-deep);
  line-height: 1.7;
  margin: 0 0 1rem;
}

.page-about .about-origin__quote footer {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

.page-about .about-origin__cards {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.6rem;
}

.page-about .about-origin__card {
  width: 2.4rem;
  height: 3.4rem;
  border-radius: 0.4rem;
  box-shadow: inset -4px -6px 0 rgba(0, 0, 0, 0.12);
}

.page-about .about-origin__card--yellow {
  background: var(--accent);
}

.page-about .about-origin__card--red {
  background: var(--signal-red);
}

/* ---- SECTION 02: TIMELINE ---- */
.page-about .about-timeline {
  background: var(--bg-mist);
  padding: clamp(3rem, 8vw, 7rem) 0;
}

.page-about .about-timeline__head {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.page-about .about-timeline__num {
  font-family: var(--font-mono);
  font-size: 4.8rem;
  font-weight: 700;
  line-height: 1;
  opacity: 0.18;
  color: var(--bg-deep);
  letter-spacing: -0.03em;
}

.page-about .about-timeline__head h2 {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  margin: 0.3rem 0 0;
  line-height: 1.1;
}

.page-about .about-timeline__layout {
  display: grid;
  gap: 2rem;
}

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

.page-about .about-timeline__media .media {
  border-radius: 1.25rem;
  overflow: hidden;
  box-shadow: 0 1.5rem 3rem -1.5rem rgba(11, 31, 26, 0.28);
}

.page-about .about-timeline__caption {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.page-about .about-timeline__track {
  list-style: none;
  margin: 0;
  padding: 0.5rem 0;
  position: relative;
}

.page-about .about-timeline__track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 1rem;
  bottom: 1rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-dim) 0%, var(--line-light) 68%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 2.25rem 2.25rem;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.3rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 5px rgba(212, 255, 0, 0.12);
  transition: transform 0.2s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .about-timeline__item:hover::before {
  transform: scale(1.25);
  box-shadow: 0 0 0 9px rgba(212, 255, 0, 0.14);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent-dim);
  letter-spacing: 0.02em;
}

.page-about .about-timeline__title {
  font-size: 1.18rem;
  color: var(--bg-deep);
  margin: 0.25rem 0 0.45rem;
}

.page-about .about-timeline__body p {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text-main);
  margin: 0;
  max-width: 34em;
}

/* ---- SECTION 03: VERIFY ---- */
.page-about .about-verify {
  position: relative;
  overflow: hidden;
  background: linear-gradient(140deg, var(--bg-deep) 0%, var(--bg-deep-2) 100%);
  color: var(--text-on-dark);
  padding: clamp(3rem, 8vw, 7rem) 0;
}

.page-about .about-verify__glow {
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--ab-accent-soft), transparent 70%);
  top: -150px;
  right: -100px;
  pointer-events: none;
}

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

.page-about .about-verify__head {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.page-about .about-verify__num {
  font-family: var(--font-mono);
  font-size: 4.8rem;
  font-weight: 700;
  line-height: 1;
  opacity: 0.16;
  color: var(--accent);
  letter-spacing: -0.03em;
}

.page-about .about-verify__head h2 {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  margin: 0.3rem 0 0;
  line-height: 1.1;
}

.page-about .about-verify__grid {
  display: grid;
  gap: 2.5rem;
}

.page-about .about-verify__content p {
  color: var(--ab-on-dark-sub);
  line-height: 1.85;
  font-size: 1rem;
  margin: 0 0 1.1rem;
  max-width: 40em;
}

.page-about .about-verify__cert {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  background: var(--ab-card-bg);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.65rem 1.25rem;
  font-size: 0.85rem;
  color: var(--ab-on-dark-sub);
  margin-top: 0.5rem;
  transition: border-color 0.2s var(--ease);
}

.page-about .about-verify__cert:hover {
  border-color: var(--accent-dim);
}

.page-about .about-verify__cert-mark {
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
}

.page-about .about-verify__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.page-about .about-verify__stat {
  background: var(--ab-card-bg);
  border: 1px solid var(--line);
  border-radius: 1.35rem;
  padding: 1.4rem 1.3rem;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-verify__stat:hover {
  border-color: var(--accent-dim);
  background: rgba(212, 255, 0, 0.03);
  transform: translateY(-3px);
}

.page-about .about-verify__stat-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 2.75rem;
  line-height: 1;
  color: var(--accent);
}

.page-about .about-verify__stat-label {
  margin-top: 0.8rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

/* ---- SECTION 04: PRINCIPLES ---- */
.page-about .about-principles {
  background: var(--page-bg);
  padding: clamp(3rem, 8vw, 7rem) 0;
  position: relative;
  overflow: hidden;
}

.page-about .about-principles__grid {
  display: grid;
  gap: 2.5rem;
}

.page-about .about-principles__title {
  font-size: clamp(2.1rem, 4.5vw, 3.4rem);
  margin: 0.5rem 0 1rem;
}

.page-about .about-principles__lead {
  color: var(--text-muted);
  line-height: 1.8;
  max-width: 34em;
}

.page-about .about-principles__list {
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0;
}

.page-about .about-principles__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  border-top: 1px solid var(--line-light);
  padding: 1.4rem 0.2rem;
  transition: background 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-about .about-principles__item:last-child {
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-principles__item:hover {
  background: var(--bg-mist);
  padding-left: 0.9rem;
}

.page-about .about-principles__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent-dim);
  line-height: 1.5;
}

.page-about .about-principles__item h3 {
  font-size: 1.1rem;
  color: var(--bg-deep);
  margin: 0 0 0.4rem;
}

.page-about .about-principles__item p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.7;
  font-size: 0.95rem;
}

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

.page-about .about-principles__frame {
  border-radius: 1.5rem;
  overflow: hidden;
  box-shadow: 0 1.5rem 3.5rem -1.5rem rgba(11, 31, 26, 0.24);
  position: relative;
}

.page-about .about-principles__frame img {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .about-principles__caption {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---- OUTRO ---- */
.page-about .about-outro {
  position: relative;
  overflow: hidden;
  background: var(--bg-deep);
}

.page-about .about-outro__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-outro__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.4;
}

.page-about .about-outro__inner {
  position: relative;
  z-index: 1;
  padding: clamp(3rem, 8vw, 6rem) 0 4rem;
  text-align: center;
  color: var(--text-on-dark);
}

.page-about .about-outro .eyebrow {
  color: var(--accent);
}

.page-about .about-outro__text {
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.7;
  max-width: 26em;
  margin: 0 auto 1.75rem;
  font-size: 1rem;
}

.page-about .about-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.page-about .about-outro .btn--ghost {
  border-color: rgba(255, 255, 255, 0.45);
  color: var(--text-on-dark);
}

.page-about .about-outro .btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---- MEDIA QUERIES ---- */
@media (min-width: 700px) {
  .page-about .about-verify__stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero__note {
    display: inline-block;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: 0.72rem;
    letter-spacing: 0.28em;
    color: rgba(255, 255, 255, 0.5);
  }

  .page-about .about-hero__body {
    grid-template-columns: minmax(0, 1fr) 380px;
    align-items: end;
    gap: 3.5rem;
  }

  .page-about .about-hero__title {
    font-size: clamp(3rem, 5vw, 5.2rem);
  }

  .page-about .about-origin__grid {
    grid-template-columns: 1.1fr 6.6fr 3.2fr;
    gap: 2.5rem;
  }

  .page-about .about-origin__content {
    padding-right: 1.5rem;
  }

  .page-about .about-timeline__head {
    margin-bottom: 3rem;
  }

  .page-about .about-timeline__layout {
    grid-template-columns: 0.9fr 1.25fr;
    gap: 3.5rem;
  }

  .page-about .about-timeline__media {
    position: sticky;
    top: 2rem;
    align-self: start;
  }

  .page-about .about-verify__head {
    margin-bottom: 3rem;
  }

  .page-about .about-verify__grid {
    grid-template-columns: 1.15fr 1fr;
    gap: 4rem;
    align-items: center;
  }

  .page-about .about-principles__grid {
    grid-template-columns: 1fr 0.72fr;
    gap: 4rem;
  }

  .page-about .about-principles__frame {
    position: sticky;
    top: 2rem;
    align-self: start;
  }
}