/* ========== 品牌概况页专属 ========== */

.page-about {
  background: var(--gray-50);
}

.page-about .breadcrumbs {
  padding-top: 20px;
  padding-bottom: 0;
}

/* ===== Hero 首屏 ===== */
.page-about__hero {
  position: relative;
  background: var(--navy-900);
  color: var(--white);
  overflow: hidden;
  padding: 40px var(--container-pad) 52px;
}

.page-about__hero::before {
  content: "02";
  position: absolute;
  right: -16px;
  top: -40px;
  font-family: var(--font-mono);
  font-size: clamp(150px, 24vw, 240px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.08em;
  color: rgba(0, 229, 255, 0.07);
  pointer-events: none;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, var(--cyan-500), rgba(0, 229, 255, 0.15) 40%, var(--orange-500)),
    linear-gradient(rgba(0, 229, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.05) 1px, transparent 1px);
  background-repeat: no-repeat;
  background-position: left bottom, 0 0, 0 0;
  background-size: 100% 3px, 24px 24px, 24px 24px;
  pointer-events: none;
}

.page-about__hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--container-max);
  margin: 0 auto;
}

.page-about__hero-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.page-about__hero-version {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan-500);
}

.page-about__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about__hero-main h1 {
  margin: 0 0 16px;
  font-family: var(--font-heading);
  font-size: clamp(32px, 6vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about__hero-lead {
  margin: 0;
  max-width: 640px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--border-200);
}

.page-about__toc {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about__toc a {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan-500);
  border: 1px solid rgba(0, 229, 255, 0.35);
  padding: 7px 14px;
  border-radius: 999px;
  text-decoration: none;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.page-about__toc a:hover,
.page-about__toc a:focus-visible {
  background: rgba(0, 229, 255, 0.12);
  border-color: var(--cyan-500);
}

.page-about__hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 0;
}

.page-about__hero-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
}

.page-about__hero-stat dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--border-200);
}

.page-about__hero-stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan-500);
}

/* ===== 自定义章节头 ===== */
.page-about__section-head {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-100);
  margin-bottom: 40px;
}

.page-about__section-index {
  font-family: var(--font-mono);
  font-size: clamp(44px, 7vw, 76px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: var(--cyan-500);
}

.page-about__section-title {
  margin: 8px 0 8px;
  font-family: var(--font-heading);
  font-size: 28px;
  line-height: 1.15;
  color: var(--navy-900);
}

.page-about__section-desc {
  margin: 0;
  max-width: 560px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray-500);
}

/* ===== 01 品牌故事 ===== */
.page-about__story-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about__story-body {
  max-width: 680px;
}

.page-about__story-body p {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-800);
}

.page-about__story-figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
}

/* ===== 02 发展历程 ===== */
.page-about__history-figure {
  margin: 0 0 8px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about__history-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__timeline {
  list-style: none;
  margin: 48px 0 0;
  padding: 0;
  position: relative;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 16px;
  bottom: 16px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--cyan-500), rgba(0, 229, 255, 0.18));
}

.page-about__timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  padding-bottom: 32px;
}

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

.page-about__timeline-node {
  position: relative;
}

.page-about__timeline-dot {
  position: relative;
  z-index: 1;
  display: block;
  width: 16px;
  height: 16px;
  margin: 28px auto 0;
  border-radius: 50%;
  background: var(--navy-900);
  border: 3px solid var(--cyan-500);
  box-sizing: border-box;
}

.page-about__timeline-card {
  padding: 20px;
  background: var(--white);
  border: 1px solid var(--border-100);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.page-about__timeline-card:hover,
.page-about__timeline-card:focus-within {
  border-color: var(--cyan-500);
  box-shadow: var(--shadow-lift);
  transform: translateY(-2px);
}

.page-about__timeline-year {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--orange-500);
}

.page-about__timeline-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 18px;
  color: var(--navy-900);
}

.page-about__timeline-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-800);
}

.page-about__timeline-item:last-child .page-about__timeline-dot {
  background: var(--cyan-500);
  animation: page-about-pulse 2s ease-out infinite;
}

@keyframes page-about-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(0, 229, 255, 0.55);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(0, 229, 255, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(0, 229, 255, 0);
  }
}

/* ===== 03 团队与能力 ===== */
.page-about__team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about__team-copy h3 {
  margin: 0 0 12px;
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--navy-900);
}

.page-about__team-copy p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-800);
}

.page-about__team-copy ul {
  display: grid;
  gap: 8px;
  margin: 0 0 24px;
  padding-left: 18px;
}

.page-about__team-copy li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-800);
}

.page-about__rings {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.page-about__ring {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0;
  padding: 20px 12px 16px;
  background: var(--white);
  border: 1px solid var(--border-100);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  text-align: center;
}

.page-about__ring-graphic {
  position: relative;
  width: 104px;
  height: 104px;
}

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

.page-about__ring-track {
  fill: none;
  stroke: var(--border-100);
  stroke-width: 8;
}

.page-about__ring-bar {
  fill: none;
  stroke: var(--cyan-500);
  stroke-width: 8;
}

.page-about__ring-bar--accent {
  stroke: var(--orange-500);
  stroke-linecap: round;
}

.page-about__ring-value {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--navy-900);
}

.page-about__ring-label {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--gray-500);
}

.page-about__ring-label small {
  display: block;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan-500);
}

.page-about__team-figure {
  margin: 40px 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
}

/* ===== 04 技术保障 ===== */
.page-about__tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about__tech-grid .board-panel h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 16px;
  color: var(--navy-900);
}

.page-about__tech-grid .board-panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-800);
}

.page-about__tech-evidence {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 24px;
}

.page-about__tech-evidence p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-800);
}

/* ===== 收口 CTA ===== */
.page-about__next-card {
  position: relative;
  overflow: hidden;
  padding: 40px 24px;
  border-radius: 16px;
  background: var(--navy-900);
  color: var(--white);
  text-align: center;
}

.page-about__next-card::before {
  content: "CONTINUE";
  position: absolute;
  right: -20px;
  bottom: -30px;
  font-family: var(--font-mono);
  font-size: 88px;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: rgba(0, 229, 255, 0.06);
  white-space: nowrap;
  pointer-events: none;
}

.page-about__next-card h2 {
  margin: 0 0 12px;
  font-family: var(--font-heading);
  font-size: 28px;
}

.page-about__next-card p {
  margin: 0 0 20px;
  color: var(--border-200);
}

.page-about__next-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

/* ===== 平板与桌面端 ===== */
@media (min-width: 768px) {
  .page-about__hero {
    padding-top: 56px;
    padding-bottom: 64px;
  }

  .page-about__hero-stats {
    gap: 14px;
  }

  .page-about__rings {
    gap: 20px;
  }
}

@media (min-width: 992px) {
  .page-about__hero-grid {
    grid-template-columns: 1.5fr 1fr;
    align-items: end;
    gap: 48px;
  }

  .page-about__story-layout {
    grid-template-columns: 1fr 400px;
    align-items: center;
    gap: 64px;
  }

  .page-about__timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about__timeline-item {
    grid-template-columns: 1fr 48px 1fr;
    gap: 0;
    padding-bottom: 40px;
  }

  .page-about__timeline-node {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about__timeline-card {
    grid-column: 3;
    grid-row: 1;
  }

  .page-about__timeline-item:nth-child(odd) .page-about__timeline-card {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
  }

  .page-about__team-layout {
    grid-template-columns: 0.85fr 1.15fr;
    align-items: start;
    gap: 56px;
  }

  .page-about__tech-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about__next-card {
    padding: 56px 48px;
  }
}