/* =====================
   品牌故事 · 页面专属样式
   作用域：.page-about
===================== */
.page-about {
  --about-pad-x: clamp(1.25rem, 5vw, 3.5rem);
  --about-card-bg: rgba(20, 43, 92, 0.55);
  --about-line: 1.8;
  position: relative;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--about-pad-x);
  padding-top: 1rem;
}

/* ---------- 首屏英雄区 ---------- */
.page-about .about-hero {
  position: relative;
  min-height: 58vh;
  display: flex;
  align-items: flex-end;
  padding: 4rem var(--about-pad-x) 5rem;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 82% 18%, rgba(230, 57, 70, 0.2) 0%, transparent 55%),
    repeating-linear-gradient(
      -45deg,
      transparent 0 12px,
      rgba(160, 179, 217, 0.035) 12px 24px
    );
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  top: -34%;
  width: 58%;
  height: 160%;
  background: linear-gradient(135deg, rgba(230, 57, 70, 0.16), rgba(20, 43, 92, 0.01) 72%);
  transform: skewX(-16deg);
  z-index: 0;
  pointer-events: none;
}

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

.page-about .page-hero-title {
  font-size: clamp(2.4rem, 7vw, 4.9rem);
  line-height: 1.04;
  font-style: italic;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin: 0.4rem 0 1.2rem;
}

.page-about .page-hero-desc {
  max-width: 580px;
  font-size: 1.0625rem;
  line-height: var(--about-line);
  color: var(--text-muted);
}

.page-about .about-hero-meta {
  margin-top: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.875rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 1px;
  color: var(--glow-white);
}

.page-about .about-hero-meta .rule-accent {
  width: 3rem;
  height: 2px;
  background: var(--accent-amber);
}

.page-about .about-hero-num {
  position: absolute;
  right: 0;
  bottom: -0.1em;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: clamp(7rem, 22vw, 15rem);
  font-weight: 800;
  color: transparent;
  -webkit-text-stroke: 2px rgba(241, 245, 249, 0.25);
  line-height: 1;
  user-select: none;
  pointer-events: none;
}

.page-about .about-hero-note {
  position: absolute;
  top: 2.5rem;
  right: var(--about-pad-x);
  writing-mode: vertical-rl;
  font-size: 0.75rem;
  letter-spacing: 0.35em;
  color: var(--text-light);
  opacity: 0.75;
  padding-right: 0.6rem;
  border-right: 1px solid rgba(230, 57, 70, 0.5);
  z-index: 2;
}

/* ---------- 章节通用 ---------- */
.page-about .section-head {
  position: relative;
}

.page-about .section-head .section-note {
  margin-top: 0.25rem;
}

.page-about .section-head .note-vertical {
  display: none;
}

/* ---------- 品牌起源 ---------- */
.page-about .origin-wrap {
  margin-top: 2.5rem;
  display: grid;
  gap: 2rem;
}

.page-about .origin-copy p {
  margin: 0 0 1rem;
  line-height: var(--about-line);
  color: var(--text-light);
}

.page-about .origin-card {
  background: var(--about-card-bg);
  border: 1px solid rgba(160, 179, 217, 0.35);
  border-left: 3px solid var(--accent-red);
  padding: 1.75rem;
  position: relative;
  box-shadow: var(--shadow-card);
}

.page-about .origin-card::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 2.5rem;
  height: 2.5rem;
  border-right: 2px solid var(--accent-amber);
  border-bottom: 2px solid var(--accent-amber);
}

.page-about .origin-card .tag {
  display: inline-block;
  margin-bottom: 0.75rem;
}

.page-about .origin-card .card-title {
  font-size: 1.625rem;
  line-height: 1.2;
}

.page-about .origin-card .card-text {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

.page-about .origin-principles {
  margin-top: 2.5rem;
  display: grid;
  gap: 0.875rem;
}

.page-about .origin-principle {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: rgba(11, 27, 61, 0.5);
  border-bottom: 1px solid rgba(160, 179, 217, 0.25);
}

.page-about .origin-no {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--data-green);
  font-weight: 600;
  letter-spacing: 1px;
  flex-shrink: 0;
}

.page-about .origin-principle p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--text-light);
}

/* ---------- 里程碑轨迹 ---------- */
.page-about .milestone-timeline {
  margin-top: 2.5rem;
}

.page-about .milestone-track {
  position: relative;
  padding-left: 1.75rem;
  display: grid;
  gap: 1.25rem;
}

.page-about .milestone-track::before {
  content: "";
  position: absolute;
  left: 0.35rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-red), var(--accent-amber), var(--data-green));
  opacity: 0.5;
}

.page-about .milestone-node {
  position: relative;
  padding: 1.5rem;
  background: var(--about-card-bg);
  border-radius: var(--radius);
  box-shadow: 0 10px 32px rgba(2, 8, 23, 0.3);
  transition: transform var(--dur) var(--ease-out), box-shadow var(--dur) var(--ease-out);
}

.page-about .milestone-node:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-float);
}

.page-about .milestone-node::before {
  content: "";
  position: absolute;
  left: -1.4rem;
  top: 1.6rem;
  width: 0.75rem;
  height: 0.75rem;
  background: var(--accent-amber);
  border-radius: 50%;
  box-shadow: 0 0 14px rgba(244, 162, 97, 0.5);
}

.page-about .milestone-phase {
  display: inline-block;
  margin-bottom: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.page-about .milestone-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: 1px;
  margin: 0 0 0.6rem;
  color: var(--text-light);
}

.page-about .milestone-text {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin: 0;
}

.page-about .milestone-figure {
  margin: 2.5rem 0 0;
  position: relative;
}

.page-about .milestone-img,
.page-about .tech-img,
.page-about .revisit-img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(160, 179, 217, 0.3);
  border-radius: var(--radius);
}

.page-about .milestone-caption,
.page-about .tech-visual figcaption,
.page-about .revisit-figure figcaption {
  margin-top: 0.75rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  letter-spacing: 1px;
  text-transform: uppercase;
  font-family: var(--font-mono);
}

/* ---------- 技术实力 ---------- */
.page-about .tech-grid {
  margin-top: 2.5rem;
  display: grid;
  gap: 2rem;
}

.page-about .tech-copy p {
  margin: 0 0 1.25rem;
  line-height: var(--about-line);
  color: var(--text-light);
}

.page-about .tech-data {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-block: 1.5rem;
}

.page-about .data-block {
  background: rgba(11, 27, 61, 0.55);
  border: 1px solid rgba(160, 179, 217, 0.25);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
}

.page-about .tech-visual {
  margin: 0;
}

.page-about .tech-list {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.875rem;
}

.page-about .tech-list li {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  padding: 1rem 1.25rem;
  background: rgba(20, 43, 92, 0.4);
  border-left: 2px solid var(--data-green);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.9375rem;
  color: var(--text-light);
  line-height: 1.7;
}

.page-about .tech-list-no {
  font-family: var(--font-mono);
  color: var(--data-green);
  font-weight: 700;
  letter-spacing: 1px;
  flex-shrink: 0;
}

.page-about .tech-cta {
  margin-top: 2.25rem;
  padding: 1.5rem 1.75rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: linear-gradient(120deg, rgba(230, 57, 70, 0.14), rgba(20, 43, 92, 0.02) 68%);
  border: 1px solid rgba(230, 57, 70, 0.4);
  border-radius: var(--radius);
}

.page-about .tech-cta p {
  margin: 0;
  font-weight: 600;
  color: var(--text-light);
}

/* ---------- 服务边界 ---------- */
.page-about .coverage-intro {
  margin-top: 2.25rem;
  max-width: 720px;
  font-size: 1.0625rem;
  line-height: var(--about-line);
  color: var(--text-light);
}

.page-about .coverage-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.875rem;
  margin-top: 2rem;
}

.page-about .coverage-card {
  background: var(--about-card-bg);
  border: 1px solid rgba(160, 179, 217, 0.25);
  padding: 1.25rem;
  position: relative;
  transition: transform var(--dur) var(--ease-out), border-color var(--dur) var(--ease-out), box-shadow var(--dur) var(--ease-out);
}

.page-about .coverage-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 3px;
  width: 100%;
  background: linear-gradient(90deg, var(--accent-red), var(--accent-amber));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-slow) var(--ease-out);
}

.page-about .coverage-card:hover {
  transform: translateY(-4px) rotate(-0.5deg);
  border-color: rgba(230, 57, 70, 0.55);
  box-shadow: var(--shadow-card);
}

.page-about .coverage-card:hover::before {
  transform: scaleX(1);
}

.page-about .coverage-card-title {
  font-family: var(--font-head);
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 2px;
  margin: 0 0 0.5rem;
  color: var(--text-light);
}

.page-about .coverage-card-text {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-muted);
  margin: 0;
}

/* ---------- 用户回访 ---------- */
.page-about .revisit-wrap {
  margin-top: 2.5rem;
  display: grid;
  gap: 2rem;
}

.page-about .revisit-copy p {
  margin: 0 0 1rem;
  line-height: var(--about-line);
  color: var(--text-light);
}

.page-about .revisit-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
  margin-top: 1.75rem;
}

.page-about .revisit-figure {
  margin: 0;
  position: relative;
}

.page-about .revisit-img {
  aspect-ratio: 4 / 3;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero {
    min-height: 64vh;
    padding-bottom: 5.5rem;
  }

  .page-about .section-head .note-vertical {
    display: block;
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    writing-mode: vertical-rl;
    font-size: 0.6875rem;
    letter-spacing: 0.3em;
    color: var(--text-muted);
    text-transform: uppercase;
    padding-right: 0.5rem;
    border-right: 1px solid rgba(230, 57, 70, 0.45);
  }

  .page-about .origin-wrap {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
    align-items: start;
  }

  .page-about .origin-principles {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  .page-about .origin-principle {
    flex-direction: column;
    gap: 0.5rem;
    padding: 1.25rem;
  }

  .page-about .tech-grid {
    grid-template-columns: 1fr 0.9fr;
    gap: 3rem;
    align-items: center;
  }

  .page-about .tech-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }

  .page-about .tech-list li {
    flex-direction: column;
    gap: 0.25rem;
    align-items: flex-start;
  }

  .page-about .coverage-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }

  .page-about .revisit-wrap {
    grid-template-columns: 1fr 0.8fr;
    gap: 4rem;
    align-items: center;
  }
}

/* ---------- 桌面端 ---------- */
@media (min-width: 1024px) {
  .page-about .about-hero {
    padding-bottom: 6.5rem;
  }

  .page-about .milestone-track {
    padding-left: 0;
    padding-top: 2.2rem;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
  }

  .page-about .milestone-track::before {
    left: 2%;
    right: 2%;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-red), var(--accent-amber), var(--data-green));
    opacity: 0.6;
  }

  .page-about .milestone-node {
    margin: 0;
  }

  .page-about .milestone-node::before {
    top: -1.35rem;
    left: 1.25rem;
  }

  .page-about .milestone-figure {
    margin-top: 3rem;
  }
}