/* ===== page-about 专属样式 ===== */
.page-about {
  --color-primary: #1A3A5C;
  --color-primary-light: #2B5A8C;
  --color-secondary: #4CAF50;
  --color-accent: #E53935;
  --color-accent-light: #FF8A80;
  --color-neutral-dark: #0D0D0D;
  --color-neutral-light: #F5F5F5;
  --color-highlight: #FFD700;
  --font-heading: 'PingFang SC', sans-serif;
  --font-body: 'Noto Sans SC', sans-serif;
  --border-width: 3px;
  --shadow-strong: 8px 8px 0 rgba(0,0,0,0.25);
  --radius: 4px;
  --max-width: 1280px;
  --base-size: 18px;
  --space-unit: 8px;

  background-color: var(--color-neutral-light);
  color: var(--color-neutral-dark);
  font-family: var(--font-body);
  line-height: 1.7;
  padding-bottom: calc(var(--space-unit) * 10);
}

/* 面包屑 */
.page-about .breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--space-unit) * 3) var(--space-unit) calc(var(--space-unit) * 1);
  font-size: calc(var(--base-size) * 0.85);
  color: var(--color-primary-light);
}

.page-about .breadcrumb a {
  color: var(--color-primary-light);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.25s ease, color 0.25s ease;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: var(--color-accent);
  color: var(--color-accent);
}

.page-about .breadcrumb [aria-current="page"] {
  font-weight: bold;
  color: var(--color-neutral-dark);
}

/* 英雄故事区 */
.page-about .hero-story {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: calc(var(--space-unit) * 4);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--space-unit) * 2) var(--space-unit) calc(var(--space-unit) * 8);
}

.page-about .hero-story__text {
  flex: 1 1 50%;
  min-width: 280px;
}

.page-about .hero-story__heading {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(2.2rem, 6vw, 4rem);
  color: var(--color-primary);
  margin: 0 0 calc(var(--space-unit) * 3);
  letter-spacing: -0.02em;
  position: relative;
  display: inline-block;
}

.page-about .hero-story__heading::after {
  content: "BRAND";
  position: absolute;
  top: -0.25em;
  right: -2.2em;
  font-size: 0.32em;
  font-style: normal;
  font-weight: 400;
  color: var(--color-accent);
  writing-mode: vertical-rl;
  letter-spacing: 0.15em;
  opacity: 0.55;
}

.page-about .hero-story__subtitle {
  font-size: calc(var(--base-size) * 1.15);
  font-weight: 600;
  color: var(--color-primary-light);
  margin-bottom: calc(var(--space-unit) * 2);
  border-left: var(--border-width) solid var(--color-accent);
  padding-left: calc(var(--space-unit) * 2);
}

.page-about .hero-story__abstract {
  font-size: var(--base-size);
  color: var(--color-neutral-dark);
  max-width: 48ch;
}

/* SVG 时间线 */
.page-about .hero-story__visual {
  flex: 0 0 45%;
  min-width: 260px;
}

.page-about .timeline-svg {
  width: 100%;
  background: var(--color-neutral-light);
  border: var(--border-width) solid var(--color-primary);
  box-shadow: var(--shadow-strong);
  overflow: hidden;
  border-radius: var(--radius);
}

.page-about .timeline-svg__graphic {
  display: block;
  width: 100%;
  height: auto;
}

/* 交互悬停 */
.page-about .timeline-svg:hover circle {
  transition: fill 0.2s ease;
}
.page-about .timeline-svg circle:hover {
  fill: var(--color-accent);
  stroke: var(--color-secondary);
  cursor: pointer;
}

/* 设计理念区 */
.page-about .design-philosophy {
  background-color: #EEF1F5;
  padding: calc(var(--space-unit) * 8) 0;
  position: relative;
  overflow: hidden;
}

.page-about .design-philosophy::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary), var(--color-accent));
}

.page-about .design-philosophy .container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-unit);
  position: relative;
  z-index: 1;
}

.page-about .design-philosophy .section-title {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  color: var(--color-primary);
  margin: 0 0 calc(var(--space-unit) * 1);
  position: relative;
  display: inline-block;
}

.page-about .design-philosophy .section-title::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 60%;
  height: var(--border-width);
  background: var(--color-accent);
}

.page-about .design-philosophy__desc {
  font-size: calc(var(--base-size) * 1.05);
  color: var(--color-primary-light);
  margin-bottom: calc(var(--space-unit) * 5);
}

/* 色块交互 */
.page-about .color-blocks {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space-unit) * 4);
  margin-bottom: calc(var(--space-unit) * 6);
}

.page-about .color-block {
  flex: 1 1 180px;
  display: flex;
  align-items: flex-start;
  gap: calc(var(--space-unit) * 2);
  padding: calc(var(--space-unit) * 2);
  border: var(--border-width) solid var(--color-neutral-dark);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 4px 4px 0 rgba(0,0,0,0.12);
  cursor: pointer;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .color-block:hover,
.page-about .color-block:focus-visible {
  border-color: var(--color-accent);
  box-shadow: 6px 6px 0 rgba(0,0,0,0.18);
  outline: none;
}

.page-about .color-block__swatch {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 2px solid rgba(0,0,0,0.12);
}

.page-about .color-block--primary .color-block__swatch { background: var(--color-primary); }
.page-about .color-block--secondary .color-block__swatch { background: var(--color-secondary); }
.page-about .color-block--accent .color-block__swatch { background: var(--color-accent); }

.page-about .color-block__info {
  flex: 1;
}

.page-about .color-block__name {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: calc(var(--base-size) * 0.95);
  color: var(--color-neutral-dark);
}

.page-about .color-block__code {
  display: block;
  font-size: calc(var(--base-size) * 0.75);
  color: #888;
  margin-bottom: calc(var(--space-unit) * 1);
}

.page-about .color-block__explanation {
  font-size: calc(var(--base-size) * 0.82);
  line-height: 1.5;
  color: var(--color-neutral-dark);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

/* 点击切换 */
.page-about .color-block[aria-pressed="true"] .color-block__explanation {
  max-height: 120px;
  padding-top: calc(var(--space-unit) * 1);
}

.page-about .design-philosophy__fig {
  margin: 0;
  border: var(--border-width) solid var(--color-primary);
  box-shadow: var(--shadow-strong);
  max-width: 520px;
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
}

.page-about .design-philosophy__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .design-philosophy__caption {
  padding: calc(var(--space-unit) * 1) calc(var(--space-unit) * 2);
  font-size: calc(var(--base-size) * 0.8);
  color: var(--color-primary-light);
  background: #fff;
}

/* 技术亮点区 */
.page-about .tech-highlights {
  padding: calc(var(--space-unit) * 8) 0;
}

.page-about .tech-highlights .container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-unit);
}

.page-about .tech-highlights .section-title {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  color: var(--color-primary);
  margin: 0 0 calc(var(--space-unit) * 1);
  position: relative;
  display: inline-block;
}

.page-about .tech-highlights .section-title::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 60%;
  height: var(--border-width);
  background: var(--color-accent);
}

.page-about .tech-highlights__desc {
  font-size: calc(var(--base-size) * 1.05);
  color: var(--color-primary-light);
  margin-bottom: calc(var(--space-unit) * 5);
}

.page-about .tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: calc(var(--space-unit) * 4);
  margin-bottom: calc(var(--space-unit) * 6);
}

.page-about .tech-card {
  background: #fff;
  border: var(--border-width) solid var(--color-primary);
  padding: calc(var(--space-unit) * 4);
  box-shadow: var(--shadow-strong);
  transition: border-color 0.25s ease, transform 0.2s ease;
}

.page-about .tech-card:hover {
  border-color: var(--color-secondary);
  transform: translate(-2px, -2px);
}

.page-about .tech-card .card__title {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 800;
  font-size: calc(var(--base-size) * 1.2);
  color: var(--color-accent);
  margin-bottom: calc(var(--space-unit) * 2);
}

.page-about .tech-card .card__text {
  font-size: calc(var(--base-size) * 0.9);
  color: var(--color-neutral-dark);
  line-height: 1.7;
}

.page-about .tech-highlights__fig {
  margin: 0;
  border: var(--border-width) solid var(--color-primary);
  box-shadow: var(--shadow-strong);
  max-width: 540px;
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
}

.page-about .tech-highlights__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .tech-highlights__caption {
  padding: calc(var(--space-unit) * 1) calc(var(--space-unit) * 2);
  font-size: calc(var(--base-size) * 0.8);
  color: var(--color-primary-light);
  background: #fff;
}

/* 团队愿景区 */
.page-about .team-spirit {
  background-color: #F0F4F8;
  padding: calc(var(--space-unit) * 8) 0;
  border-top: var(--border-width) solid var(--color-accent-light);
  border-bottom: var(--border-width) solid var(--color-accent-light);
}

.page-about .team-spirit .container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-unit);
}

.page-about .team-spirit .section-title {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  color: var(--color-primary);
  margin: 0 0 calc(var(--space-unit) * 4);
  position: relative;
  display: inline-block;
}

.page-about .team-spirit .section-title::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 60%;
  height: var(--border-width);
  background: var(--color-accent);
}

.page-about .team-content {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space-unit) * 5);
  align-items: center;
}

.page-about .team-content__fig {
  margin: 0;
  flex: 1 1 45%;
  min-width: 260px;
  border: var(--border-width) solid var(--color-primary);
  box-shadow: var(--shadow-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
}

.page-about .team-content__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .team-content__text {
  flex: 1 1 45%;
  min-width: 260px;
  font-size: var(--base-size);
  line-height: 1.8;
}

.page-about .team-content__text p {
  margin: 0 0 calc(var(--space-unit) * 3);
}

.page-about .team-content__actions {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space-unit) * 2);
  margin-top: calc(var(--space-unit) * 4);
}

/* 按钮样式复写 */
.page-about .btn {
  display: inline-block;
  padding: calc(var(--space-unit) * 1.5) calc(var(--space-unit) * 4);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: calc(var(--base-size) * 0.9);
  text-decoration: none;
  border: var(--border-width) solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.page-about .btn-primary:hover,
.page-about .btn-primary:focus-visible {
  background: var(--color-accent-light);
  color: var(--color-neutral-dark);
  border-color: var(--color-accent-light);
}

.page-about .btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.page-about .btn-outline:hover,
.page-about .btn-outline:focus-visible {
  background: var(--color-primary);
  color: #fff;
}

/* 移动端优先调整 */
@media (max-width: 640px) {
  .page-about .hero-story {
    flex-direction: column;
    padding-bottom: calc(var(--space-unit) * 4);
  }

  .page-about .hero-story__text,
  .page-about .hero-story__visual {
    flex: 1 1 100%;
  }

  .page-about .hero-story__heading::after {
    position: static;
    writing-mode: horizontal-tb;
    display: block;
    margin-top: calc(var(--space-unit) * 1);
    opacity: 0.6;
    font-size: 0.5em;
  }

  .page-about .color-blocks {
    flex-direction: column;
  }

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

  .page-about .team-content {
    flex-direction: column;
  }
}

@media (min-width: 641px) and (max-width: 1024px) {
  .page-about .hero-story__heading::after {
    right: -1.8em;
    font-size: 0.28em;
  }
}