/* ==========================================================================
   走进开来 | about.html
   依赖: variable.css / base.css / common.css / home.css / products.css
   ========================================================================== */

/* ---------- 锚点子导航 ---------- */
.about-subnav {
  position: sticky;
  top: var(--nav-height);
  z-index: 40;
  background: var(--color-bg-white);
  border-bottom: 1px solid var(--color-border-light);
}

.about-subnav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;
  gap: 0 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  min-height: 48px;
}

.about-subnav__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 10px 20px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-regular);
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.about-subnav__link:hover {
  color: var(--color-primary);
}

.about-subnav__link.is-active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: 600;
}

/* ---------- 页面区块 ---------- */
.about-page {
  padding-top: 40px;
  padding-bottom: 64px;
}

.about-block {
  scroll-margin-top: calc(var(--nav-height) + 64px);
  margin-bottom: 56px;
}

.about-block:last-child {
  margin-bottom: 0;
}

.about-block__heading {
  margin-bottom: 28px;
  text-align: center;
}

.about-block__title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-text-primary);
}

.about-block__line {
  display: block;
  width: 48px;
  height: 3px;
  margin: 12px auto 0;
  border-radius: 2px;
  background: var(--gradient-primary);
}

/* ---------- 公司简介 ---------- */
.about-profile {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.2fr);
  gap: 36px;
  align-items: center;
  padding: 28px;
  background: var(--color-bg-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.about-profile__media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-bg-gray);
  aspect-ratio: 4 / 3;
}

.about-profile__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-profile__content {
  font-size: 0.95rem;
  line-height: 1.95;
  color: var(--color-text-regular);
  text-align: justify;
}

.about-profile__content p {
  margin: 0 0 1.1em;
}

.about-profile__content p:last-child {
  margin-bottom: 0;
}

.about-profile__brand {
  color: var(--color-primary);
  font-weight: 700;
}

.about-profile__em {
  color: #c0392b;
  font-weight: 600;
}

/* ---------- 发展历程（横向时间轴，节点增多时可左右滑动） ---------- */
.about-timeline-wrap {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 8px 0 16px;
  scrollbar-width: thin;
}

.about-timeline {
  --tl-item: 210px;
  position: relative;
  display: flex;
  align-items: stretch;
  width: max-content;
  min-width: 100%;
  list-style: none;
  margin: 0;
  padding: 0;
}

.about-timeline__item {
  position: relative;
  z-index: 1;
  flex: 1 0 var(--tl-item);
  width: var(--tl-item);
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* 线段画在每个节点同一水平中线，首尾只画到圆点中心 */
.about-timeline__item::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  transform: translateY(-50%);
  z-index: 0;
}

.about-timeline__item:first-child::before {
  left: 50%;
}

.about-timeline__item:last-child::before {
  right: 50%;
}

.about-timeline__slot {
  flex: 1 1 0;
  display: flex;
  width: 100%;
  min-height: 148px;
  padding: 0 8px;
  box-sizing: border-box;
}

.about-timeline__item > .about-timeline__slot:first-child {
  align-items: flex-end;
  padding-bottom: 18px;
}

.about-timeline__item > .about-timeline__slot:last-child {
  align-items: flex-start;
  padding-top: 18px;
}

.about-timeline__dot {
  position: relative;
  z-index: 1;
  flex: 0 0 14px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--color-primary);
  box-shadow: 0 0 0 4px rgba(28, 116, 187, 0.15);
}

.about-timeline__card {
  width: 100%;
  padding: 14px 12px;
  text-align: center;
  background: var(--color-bg-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
}

.about-timeline__year {
  margin: 0 0 8px;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.04em;
}

.about-timeline__text {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

/* ---------- 企业文化 ---------- */
.about-culture {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.about-culture__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 28px 20px 24px;
  background: var(--color-bg-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

.about-culture__card:hover {
  border-color: rgba(28, 116, 187, 0.35);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.about-culture__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  margin-bottom: 16px;
  border-radius: 50%;
  color: var(--color-primary);
  background: var(--color-primary-lighter);
}

.about-culture__icon svg {
  width: 32px;
  height: 32px;
}

.about-culture__icon img {
  max-width: 40px;
  height: auto;
}

.about-culture__title {
  margin: 0 0 10px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: 0.06em;
}

.about-culture__desc {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* ---------- 资质荣誉 Tabs ---------- */
.about-honors__tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 4px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--color-border-light);
}

.about-honors__tab {
  appearance: none;
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 12px 28px;
  font-size: 0.9375rem;
  font-weight: 500;
  font-family: inherit;
  color: var(--color-text-regular);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.about-honors__tab:hover {
  color: var(--color-primary);
}

.about-honors__tab.is-active {
  color: var(--color-primary);
  font-weight: 600;
  border-bottom-color: var(--color-primary);
  background: var(--color-primary-lighter);
}

.about-honors__panel[hidden] {
  display: none;
}

.about-honors__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  justify-items: center;
}

.about-honors__grid .cert-card {
  width: 100%;
  max-width: 280px;
  flex: none;
}

.about-honors__grid .cert-card__media {
  height: 180px;
  background: #f7f9fb;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1200px) {
  .about-culture {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .about-honors__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 992px) {
  .about-profile {
    grid-template-columns: 1fr 1.1fr;
    gap: 24px;
    padding: 20px;
  }

  .about-honors__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .about-subnav {
    top: 0;
  }

  .about-subnav__list {
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: 0;
  }

  .about-subnav__list::-webkit-scrollbar {
    display: none;
  }

  .about-subnav__link {
    flex-shrink: 0;
    padding: 10px 14px;
    font-size: 0.875rem;
    min-height: 44px;
  }

  .about-block {
    scroll-margin-top: 56px;
    margin-bottom: 44px;
  }

  .about-block__title {
    font-size: 1.25rem;
  }

  .about-profile {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 16px;
  }

  .about-profile__media {
    aspect-ratio: 16 / 10;
  }

  .about-profile__content {
    font-size: 0.9rem;
    line-height: 1.85;
    text-align: left;
  }

  /* 手机端只保留卡片 */
  .about-timeline-wrap {
    overflow: visible;
    padding: 0;
  }

  .about-timeline {
    display: flex;
    flex-direction: column;
    gap: 14px;
    width: 100%;
    min-width: 0;
  }

  .about-timeline__item {
    flex: none;
    min-width: 0;
    width: 100%;
    display: block;
  }

  .about-timeline__item::before,
  .about-timeline__dot {
    display: none;
  }

  .about-timeline__slot {
    display: block;
    min-height: 0;
    padding: 0;
  }

  .about-timeline__slot:empty {
    display: none;
  }

  .about-timeline__card {
    text-align: left;
  }

  .about-culture {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }

  .about-culture__card {
    padding: 20px 14px 18px;
  }

  .about-culture__icon {
    width: 52px;
    height: 52px;
  }

  .about-culture__icon svg {
    width: 26px;
    height: 26px;
  }

  .about-honors__tab {
    padding: 10px 16px;
    font-size: 0.875rem;
  }

  .about-honors__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .about-honors__grid .cert-card__media {
    height: 140px;
  }
}

@media (max-width: 480px) {
  .about-culture {
    grid-template-columns: 1fr;
  }

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

  .about-honors__grid .cert-card {
    max-width: 320px;
  }

  .about-honors__grid .cert-card__media {
    height: 168px;
  }
}