/* ========== 品牌档案页 · page-about ========== */
.page-about {
  --about-grid-line: rgba(255, 255, 255, 0.045);
  background: linear-gradient(180deg, var(--tb-primary) 0%, var(--tb-deep) 100%);
  color: var(--tb-white);
  overflow-x: hidden;
}

/* ---------- 首屏 Hero ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(5.5rem, 10vw, 8.5rem) 0 4rem;
  background:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px),
    radial-gradient(ellipse at 82% 12%, rgba(255, 107, 53, 0.18), transparent 55%),
    linear-gradient(180deg, var(--tb-primary) 0%, var(--tb-deep) 100%);
  background-size: 44px 44px, 44px 44px, 100% 100%, 100% 100%;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 2.5rem;
  padding-bottom: 4.5rem;
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--tb-accent-green);
  border: 1px solid rgba(57, 255, 20, 0.35);
  background: rgba(57, 255, 20, 0.08);
  border-radius: var(--tb-radius-pill);
  padding: 0.35rem 0.9rem;
}

.page-about .about-hero__title {
  font-family: var(--tb-font-head);
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 1.08;
  margin: 1.1rem 0 1.25rem;
  letter-spacing: -0.02em;
}

.page-about .about-hero__title span {
  display: block;
  background: linear-gradient(90deg, var(--tb-accent) 0%, var(--tb-orange-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

@supports not (background-clip: text) or not (-webkit-background-clip: text) {
  .page-about .about-hero__title span {
    color: var(--tb-accent);
  }
}

.page-about .about-hero__lead {
  max-width: 34rem;
  color: var(--tb-muted);
  font-size: 1.0625rem;
  line-height: 1.75;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}

.page-about .about-hero__stats {
  display: grid;
  gap: 1rem;
}

.page-about .about-hero__stat {
  padding: 1.5rem 1.75rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--tb-border-strong);
  border-radius: var(--tb-radius-lg);
  backdrop-filter: blur(6px);
}

.page-about .about-hero__stat .tb-stat {
  display: block;
  font-size: 2rem;
  line-height: 1.2;
}

.page-about .about-hero__stat-label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--tb-muted);
}

.page-about .about-hero__curve {
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 90px;
  pointer-events: none;
}

.page-about .about-hero__curve svg {
  display: block;
  width: 100%;
  height: 100%;
}

/* ---------- 01 品牌起源 ---------- */
.page-about .about-origin {
  background: var(--tb-deep);
  padding-top: 4.5rem;
  padding-bottom: 5.5rem;
}

.page-about .about-origin__grid {
  display: grid;
  gap: 2.5rem;
  margin-top: 2.25rem;
}

.page-about .about-origin__content h2 {
  font-family: var(--tb-font-head);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.25;
  margin-bottom: 1.25rem;
}

.page-about .about-origin__content p {
  color: var(--tb-muted);
  margin-bottom: 1rem;
  line-height: 1.75;
}

.page-about .about-origin__content b {
  color: var(--tb-accent-green);
  font-weight: 600;
}

.page-about .about-origin__media {
  border-radius: var(--tb-radius-lg);
  overflow: hidden;
  box-shadow: var(--tb-shadow);
}

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

/* ---------- 02 发展里程碑 ---------- */
.page-about .about-milestones {
  padding-top: 4.5rem;
  padding-bottom: 5.5rem;
  background:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(180deg, var(--tb-primary) 0%, var(--tb-deep) 100%);
  background-size: 40px 40px, 40px 40px, 100% 100%;
}

.page-about .about-timeline {
  position: relative;
  margin-top: 3rem;
  padding: 0.5rem 0;
}

.page-about .about-timeline__path {
  position: absolute;
  top: 0;
  left: 0.5rem;
  width: 56px;
  height: 100%;
  pointer-events: none;
  opacity: 0.8;
}

.page-about .about-timeline__item {
  position: relative;
  margin: 0 0 2rem 4rem;
}

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

.page-about .about-timeline__item summary {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  list-style: none;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--tb-border);
  border-radius: var(--tb-radius-lg);
  cursor: pointer;
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-timeline__item summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline__item summary::marker {
  content: "";
}

.page-about .about-timeline__item summary:hover {
  background: rgba(255, 107, 53, 0.09);
  border-color: rgba(255, 107, 53, 0.5);
}

.page-about .about-timeline__item > summary::before {
  content: "";
  position: absolute;
  top: 50%;
  left: -2.25rem;
  width: 16px;
  height: 16px;
  transform: translateY(-50%);
  border-radius: 50%;
  background: var(--tb-accent);
  border: 3px solid var(--tb-primary);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.25);
  z-index: 1;
}

.page-about .about-timeline__item[open] summary {
  background: rgba(255, 107, 53, 0.08);
  border-color: rgba(255, 107, 53, 0.55);
}

.page-about .about-timeline__year {
  flex-shrink: 0;
  font-family: var(--tb-font-data);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--tb-accent);
  line-height: 1.2;
}

.page-about .about-timeline__heading {
  flex: 1;
  font-family: var(--tb-font-head);
  font-size: 1.0625rem;
  line-height: 1.35;
  color: var(--tb-white);
}

.page-about .about-timeline__toggle {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 1px solid var(--tb-border-strong);
  color: var(--tb-accent);
  font-size: 1.25rem;
  line-height: 1;
  transition: transform 0.3s var(--tb-ease), background 0.3s ease, color 0.3s ease;
}

.page-about .about-timeline__item[open] .about-timeline__toggle {
  transform: rotate(45deg);
  background: rgba(255, 107, 53, 0.18);
}

.page-about .about-timeline__content {
  padding: 1rem 1.5rem 0.25rem;
  color: var(--tb-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ---------- 03 团队与能力 ---------- */
.page-about .about-team {
  padding-top: 4.5rem;
  padding-bottom: 5.5rem;
}

.page-about .about-team__grid {
  display: grid;
  gap: 2.5rem;
  margin-top: 2.25rem;
}

.page-about .about-team__media {
  border-radius: var(--tb-radius-lg);
  overflow: hidden;
  box-shadow: var(--tb-shadow);
}

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

.page-about .about-team__content h2 {
  font-family: var(--tb-font-head);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.25;
  margin-bottom: 1rem;
}

.page-about .about-team__content > p {
  color: var(--tb-muted);
  margin-bottom: 1.25rem;
  line-height: 1.75;
}

.page-about .about-team__content .tb-list {
  margin: 0 0 1.75rem;
}

.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.page-about .about-team__stat {
  padding: 1rem 0.75rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--tb-border);
  border-radius: var(--tb-radius);
  text-align: center;
}

.page-about .about-team__stat .tb-stat {
  display: block;
  font-size: 1.375rem;
  line-height: 1.2;
  margin-bottom: 0.2rem;
}

.page-about .about-team__stat span:last-child {
  display: block;
  font-size: 0.8125rem;
  color: var(--tb-muted);
}

/* ---------- 04 资质与信任 ---------- */
.page-about .about-trust {
  padding-top: 4.5rem;
  padding-bottom: 5.5rem;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(255, 107, 53, 0.12) 0%, transparent 60%),
    linear-gradient(180deg, var(--tb-deep) 0%, var(--tb-primary) 100%);
}

.page-about .about-trust__head {
  margin-top: 1.25rem;
}

.page-about .about-trust__badges {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin: 2.5rem 0 3rem;
}

.page-about .about-trust__badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.75rem 1.5rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--tb-border);
  border-radius: var(--tb-radius-lg);
  transition: transform 0.3s var(--tb-ease), border-color 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-trust__badge:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 107, 53, 0.55);
  background: rgba(255, 107, 53, 0.08);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.3);
}

.page-about .about-trust__badge svg {
  width: 48px;
  height: 48px;
  margin-bottom: 1rem;
  color: var(--tb-accent);
  filter: drop-shadow(0 0 10px rgba(255, 107, 53, 0.3));
}

.page-about .about-trust__badge h3 {
  font-family: var(--tb-font-data);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.page-about .about-trust__badge p {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--tb-muted);
}

.page-about .about-trust__media {
  border-radius: var(--tb-radius-lg);
  overflow: hidden;
  box-shadow: var(--tb-shadow);
}

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

/* ---------- 05 愿景与使命 ---------- */
.page-about .about-vision {
  position: relative;
  overflow: hidden;
  padding-top: 4.5rem;
  padding-bottom: 6rem;
  background:
    radial-gradient(ellipse at 18% 100%, rgba(57, 255, 20, 0.08) 0%, transparent 52%),
    radial-gradient(ellipse at 82% 0%, rgba(255, 107, 53, 0.1) 0%, transparent 50%),
    var(--tb-deep);
}

.page-about .about-vision__inner {
  max-width: 48rem;
  margin: 2.25rem auto 0;
  text-align: center;
}

.page-about .about-vision__inner h2 {
  font-family: var(--tb-font-head);
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  line-height: 1.25;
  margin-bottom: 1.25rem;
}

.page-about .about-vision__inner p {
  color: var(--tb-muted);
  margin-bottom: 1rem;
  line-height: 1.75;
}

.page-about .about-vision__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 2.25rem;
}

/* ---------- 响应式增强 ---------- */
@media (min-width: 600px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, 1fr);
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
    gap: 4rem;
  }

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

  .page-about .about-origin__grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 4rem;
  }

  .page-about .about-timeline__path {
    left: 50%;
    width: 160px;
    transform: translateX(-50%);
  }

  .page-about .about-timeline__item {
    width: calc(50% - 2.5rem);
    margin-left: 0;
  }

  .page-about .about-timeline__item--left {
    margin-right: auto;
  }

  .page-about .about-timeline__item--right {
    margin-left: auto;
  }

  .page-about .about-timeline__item--left summary {
    flex-direction: row-reverse;
  }

  .page-about .about-timeline__item--left > summary::before {
    left: calc(100% + 2rem);
    right: auto;
  }

  .page-about .about-timeline__item--right > summary::before {
    left: -3rem;
  }

  .page-about .about-timeline__item--left .about-timeline__content {
    text-align: right;
  }

  .page-about .about-team__grid {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
    gap: 4rem;
  }

  .page-about .about-team__media {
    height: 100%;
    min-height: 420px;
  }

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