.page-about {
  --about-radius: 20px;
  --about-shadow: 0 24px 60px rgba(7, 40, 30, 0.16);
  overflow-x: hidden;
}

/* ---------- Hero 首屏 ---------- */
.about-hero {
  position: relative;
  background:
    radial-gradient(1100px 560px at 82% 18%, rgba(17, 107, 78, 0.62), transparent 62%),
    var(--lb-primary);
  color: var(--lb-white);
  padding: clamp(2.4rem, 6vw, 4.8rem) 0 clamp(3.2rem, 7vw, 5.4rem);
  overflow: hidden;
}

.about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  z-index: 1;
}

.about-hero__shape {
  position: absolute;
  z-index: 1;
}

.about-hero__shape--green {
  top: 0;
  right: -10%;
  width: 48%;
  height: 100%;
  background: linear-gradient(135deg, rgba(7, 40, 30, 0.9), rgba(7, 40, 30, 0.2));
  clip-path: polygon(24% 0, 100% 0, 100% 100%, 0 100%);
}

.about-hero__shape--orange {
  right: 3%;
  bottom: -26%;
  width: 24%;
  height: 62%;
  background: linear-gradient(135deg, var(--lb-accent), var(--lb-accent-light));
  clip-path: polygon(38% 0, 100% 22%, 64% 100%, 0 74%);
  box-shadow: 0 24px 60px rgba(255, 107, 53, 0.35);
  opacity: 0.95;
}

.about-hero__content {
  position: relative;
  z-index: 2;
  max-width: 880px;
}

.about-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  padding: 8px 16px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(6px);
}

.about-hero__badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lb-accent);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.25);
  animation: about-blink 1.6s ease-in-out infinite;
}

@keyframes about-blink {
  0%, 100% { box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.2); }
  50% { box-shadow: 0 0 0 7px rgba(255, 107, 53, 0.08); }
}

.about-hero__title {
  font-family: var(--lb-font-heading);
  font-size: clamp(2.1rem, 5.4vw, 4.1rem);
  line-height: 1.1;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin: 14px 0 18px;
}

.about-hero__lead {
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  line-height: 1.65;
  max-width: 34em;
  color: rgba(255, 255, 255, 0.84);
  margin-bottom: 26px;
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.about-hero .breadcrumb {
  margin-bottom: 18px;
}

.about-hero .breadcrumb__link,
.about-hero .breadcrumb__current {
  color: rgba(255, 255, 255, 0.72);
}

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

/* ---------- 故事开场 ---------- */
.about-intro {
  padding-top: clamp(3rem, 7vw, 5.5rem);
  padding-bottom: clamp(2.4rem, 5vw, 4rem);
}

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

.about-intro__block {
  padding: clamp(1.6rem, 4vw, 2.7rem);
  position: relative;
}

.about-intro__block--main {
  background: linear-gradient(135deg, var(--lb-primary-deep), var(--lb-primary-mid));
  color: var(--lb-white);
  z-index: 2;
}

.about-intro__block--side {
  background: linear-gradient(135deg, var(--lb-accent), var(--lb-accent-light));
  color: #1A1A1A;
  z-index: 1;
}

.about-intro__index {
  display: inline-block;
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  color: var(--lb-accent-light);
  border: 1px solid rgba(255, 209, 102, 0.4);
  border-radius: 999px;
  padding: 4px 12px;
  margin-bottom: 14px;
}

.about-intro__block--side .about-intro__index {
  color: #1A1A1A;
  border-color: rgba(26, 26, 26, 0.25);
}

.about-intro__block h2 {
  font-family: var(--lb-font-heading);
  font-size: clamp(1.8rem, 3.6vw, 2.8rem);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin: 8px 0 14px;
}

.about-intro__block p {
  font-size: 1rem;
  line-height: 1.7;
  margin: 0;
}

.about-intro__note {
  margin-top: 28px;
  max-width: 680px;
  color: var(--lb-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  padding-left: 18px;
  border-left: 3px solid var(--lb-accent);
}

/* ---------- 版本迭代 ---------- */
.about-versions {
  padding-top: clamp(2.6rem, 6vw, 4.5rem);
  padding-bottom: clamp(2.6rem, 6vw, 4.5rem);
}

.about-versions__head {
  max-width: 720px;
  margin-bottom: 36px;
}

.about-versions__desc {
  color: var(--lb-text-muted);
  font-size: 1rem;
  line-height: 1.65;
  margin-top: 10px;
}

.about-versions__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.about-versions__visual {
  margin: 0;
  position: relative;
}

.about-versions__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--about-radius);
  box-shadow: var(--about-shadow);
}

.about-versions__visual figcaption {
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--lb-text-muted);
  line-height: 1.5;
}

.about-versions__compare {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  align-content: center;
}

.about-versions__item {
  background: var(--lb-white);
  border: 1px solid var(--lb-border);
  border-radius: var(--about-radius);
  padding: clamp(1.2rem, 3vw, 1.8rem);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  cursor: default;
}

.about-versions__item:hover,
.about-versions__item:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--about-shadow);
  border-color: transparent;
}

.about-versions__item--old:hover {
  background: linear-gradient(135deg, #F2F2F2, var(--lb-white));
}

.about-versions__item--new:hover {
  border-color: rgba(255, 107, 53, 0.35);
}

.about-versions__tag {
  display: inline-block;
  font-family: var(--lb-font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--lb-text-muted);
  border: 1px solid var(--lb-border);
  border-radius: 999px;
  padding: 4px 12px;
  margin-bottom: 12px;
  background: var(--lb-bg);
}

.about-versions__tag--orange {
  color: var(--lb-white);
  background: var(--lb-accent);
  border-color: var(--lb-accent);
}

.about-versions__item h3 {
  font-family: var(--lb-font-heading);
  font-size: 1.35rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin: 0 0 10px;
  color: var(--lb-text);
}

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

.about-versions__extra {
  margin-top: 12px !important;
  padding-top: 12px;
  border-top: 1px dashed var(--lb-border);
  color: var(--lb-text) !important;
  font-size: 0.9rem !important;
}

/* ---------- 发展历程时间线 ---------- */
.about-timeline {
  position: relative;
  background:
    linear-gradient(rgba(7, 40, 30, 0.96), rgba(11, 61, 46, 0.98)),
    var(--lb-primary);
  color: var(--lb-white);
  padding-top: clamp(3rem, 7vw, 5.5rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

.about-timeline::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
}

.about-timeline__head {
  position: relative;
  z-index: 2;
  max-width: 760px;
  margin-bottom: 28px;
}

.about-timeline__lead {
  color: rgba(255, 255, 255, 0.72);
  font-size: 1rem;
  line-height: 1.65;
  margin-top: 10px;
}

.about-timeline__map {
  position: relative;
  z-index: 2;
  overflow: hidden;
  border-radius: var(--about-radius);
  margin: 28px 0 44px;
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.22);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.about-timeline__bg {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  object-position: center;
  opacity: 0.4;
  filter: saturate(0.72);
}

.about-timeline__map::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(120deg, rgba(11, 61, 46, 0.3) 0%, rgba(7, 40, 30, 0.05) 48%, rgba(255, 107, 53, 0.18) 100%);
}

.about-timeline__track {
  position: relative;
  z-index: 2;
  list-style: none;
  margin: 0;
  padding: 0;
}

.about-timeline__track::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 15px;
  width: 2px;
  background: linear-gradient(180deg, var(--lb-accent) 0%, rgba(255, 107, 53, 0.42) 45%, rgba(0, 200, 200, 0.28) 100%);
  border-radius: 2px;
}

.about-timeline__step {
  position: relative;
  padding: 0 0 40px 56px;
}

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

.about-timeline__dot {
  position: absolute;
  top: 8px;
  left: 6px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--lb-accent);
  box-shadow: 0 0 0 6px rgba(255, 107, 53, 0.22), 0 0 0 10px rgba(255, 107, 53, 0.08);
  transition: box-shadow 0.4s ease;
}

.about-timeline__step.is-visible .about-timeline__dot {
  box-shadow: 0 0 0 6px rgba(255, 107, 53, 0.28), 0 0 32px rgba(255, 107, 53, 0.55);
}

.about-timeline__meta {
  margin-bottom: 8px;
}

.about-timeline__stamp {
  display: inline-flex;
  align-items: center;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--lb-accent-light);
  border: 1px solid rgba(255, 209, 102, 0.4);
  background: rgba(255, 209, 102, 0.08);
  border-radius: 999px;
  padding: 5px 12px;
}

.about-timeline__text h3 {
  font-family: var(--lb-font-heading);
  font-size: 1.35rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin: 0 0 8px;
  color: var(--lb-white);
}

.about-timeline__text p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.78);
  max-width: 42em;
}

/* ---------- 品牌理念与承诺 ---------- */
.about-promise {
  padding-top: clamp(3rem, 7vw, 5.5rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

.about-promise__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.about-promise__intro > p {
  color: var(--lb-text-muted);
  line-height: 1.7;
  margin: 16px 0;
}

.about-promise__points {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.about-promise__points li {
  position: relative;
  padding-left: 26px;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--lb-text);
}

.about-promise__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--lb-accent);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.18);
}

.about-promise__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  background: var(--lb-white);
  border-radius: var(--about-radius);
  padding: clamp(1.2rem, 3vw, 2rem);
  box-shadow: var(--about-shadow);
  align-content: center;
}

.about-promise__stat {
  flex: 1 1 140px;
  border-left: 3px solid var(--lb-accent);
  padding-left: 18px;
}

.about-promise__stat p {
  margin: 6px 0 0;
  font-size: 0.88rem;
  color: var(--lb-text-muted);
  line-height: 1.5;
}

.about-promise__num {
  font-size: clamp(2.3rem, 5vw, 3.4rem);
  line-height: 1;
  color: var(--lb-accent);
  font-weight: 500;
}

.about-promise__unit {
  font-family: var(--lb-font-body);
  font-size: 0.82rem;
  color: var(--lb-text);
  margin-left: 4px;
}

.about-promise__bottom {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: center;
  margin-top: 40px;
  padding-top: 40px;
  border-top: 1px solid var(--lb-border);
}

.about-promise__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--about-radius);
  box-shadow: var(--about-shadow);
}

.about-promise__note {
  background: linear-gradient(135deg, var(--lb-primary-deep), var(--lb-primary-mid));
  color: var(--lb-white);
  border-radius: var(--about-radius);
  padding: clamp(1.4rem, 3.4vw, 2.2rem);
}

.about-promise__note h3 {
  font-family: var(--lb-font-heading);
  font-size: 1.5rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin: 0 0 12px;
}

.about-promise__note p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
}

.about-promise__note a {
  color: var(--lb-accent-light);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity 0.2s ease;
}

.about-promise__note a:hover {
  opacity: 0.82;
}

/* ---------- 响应式增强 ---------- */
@media (min-width: 720px) {
  .about-intro__grid {
    grid-template-columns: 1fr 1fr;
    gap: 0;
  }

  .about-intro__block--main {
    margin-right: -24px;
  }

  .about-intro__block--side {
    margin-top: 56px;
    margin-left: -24px;
  }

  .about-versions__layout {
    grid-template-columns: 0.94fr 1.06fr;
    gap: 32px;
    align-items: center;
  }

  .about-versions__compare {
    grid-template-columns: 1fr;
  }

  .about-promise__grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 44px;
  }

  .about-promise__bottom {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (min-width: 960px) {
  .about-hero {
    padding-top: 5rem;
    padding-bottom: 6.5rem;
  }

  .about-intro__grid {
    grid-template-columns: 1.2fr 0.95fr;
  }

  .about-intro__block {
    padding: 2.6rem;
  }

  .about-timeline__track::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .about-timeline__step {
    width: 50%;
    padding: 0 52px 44px 0;
  }

  .about-timeline__step:nth-child(even) {
    margin-left: auto;
    padding: 0 0 44px 52px;
    text-align: left;
  }

  .about-timeline__step:nth-child(odd) {
    margin-right: auto;
    padding: 0 52px 44px 0;
    text-align: right;
  }

  .about-timeline__step:nth-child(odd) .about-timeline__dot {
    left: auto;
    right: -10px;
  }

  .about-timeline__step:nth-child(even) .about-timeline__dot {
    left: -10px;
  }

  .about-timeline__step:nth-child(odd) .about-timeline__text p {
    margin-left: auto;
  }

  .about-timeline__map {
    margin-top: 40px;
    margin-bottom: 52px;
  }

  .about-promise__stats {
    padding: 2rem;
  }
}