.page-about {
  --about-hero-font-scale: clamp(2.8rem, 8vw, 6.2rem);
  --about-value-gap: var(--spacing-md);
  --about-card-radius: 6px;
  --about-connector-color: var(--color-accent);

  background-color: var(--color-primary);
  color: var(--color-white);
  overflow-x: hidden;
}

/* ===== Hero 首屏 ===== */
.about-hero {
  position: relative;
  padding: var(--spacing-xl) var(--spacing-md) var(--spacing-lg);
  min-height: 80vh;
  display: flex;
  align-items: center;
}

.about-hero__grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(192,192,192,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(192,192,192,0.06) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.about-hero__speed-line {
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: linear-gradient(135deg, transparent 40%, rgba(255,107,53,0.08) 60%, transparent 80%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0% 100%);
  pointer-events: none;
}

.about-hero__inner {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  position: relative;
  z-index: 1;
  width: 100%;
}

.about-hero__text {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.about-hero__label {
  color: var(--color-accent);
  font-size: var(--font-size-index);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-xs);
}

.about-hero__brand {
  font-family: var(--font-heading);
  font-size: var(--about-hero-font-scale);
  font-weight: 700;
  line-height: var(--line-height-heading);
  color: var(--color-white);
  margin: 0;
  letter-spacing: -0.02em;
  text-shadow: 2px 2px 0 rgba(255,107,53,0.3);
}

.about-hero__core {
  font-family: var(--font-heading);
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  font-weight: 400;
  color: var(--color-silver);
  letter-spacing: 0.3em;
  margin: var(--spacing-xs) 0;
}

.about-hero__values {
  display: flex;
  flex-wrap: wrap;
  gap: var(--about-value-gap);
  margin-top: var(--spacing-md);
}

.about-hero__value {
  font-family: var(--font-heading);
  font-size: clamp(1rem, 2vw, 1.4rem);
  font-weight: 700;
  font-style: italic;
  color: var(--color-accent);
  background: rgba(255,107,53,0.1);
  border-left: 3px solid var(--color-accent);
  padding: var(--spacing-xs) var(--spacing-sm);
  cursor: default;
  transition: transform var(--transition-speed) ease, background var(--transition-speed) ease;
}

.about-hero__value:hover,
.about-hero__value:focus-within {
  transform: scale(1.06);
  background: rgba(255,107,53,0.2);
}

.about-hero__visual {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}

.about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 400px;
  object-fit: cover;
  border-radius: var(--about-card-radius);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

/* ===== Path SVG 曲线引导 ===== */
.about-path {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.about-path__svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 80px;
  overflow: visible;
}

/* ===== Connector 连接器 ===== */
.about-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-sm) 0;
  max-width: var(--max-width);
  margin: 0 auto;
}

.about-connector__line {
  width: 2px;
  height: 48px;
  background: linear-gradient(to bottom, var(--about-connector-color), transparent);
}

.about-connector__line--1 {
  background: linear-gradient(to bottom, var(--color-accent), var(--color-silver));
}

.about-connector__line--2 {
  background: linear-gradient(to bottom, var(--color-silver), var(--color-accent));
}

.about-connector__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-accent);
  margin-top: -4px;
}

/* ===== Section 通用 ===== */
.about-section {
  padding: var(--spacing-xl) var(--spacing-md);
  position: relative;
}

.about-section__meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.about-section__line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  max-width: 120px;
}

.about-section__title {
  color: var(--color-white);
  margin-top: 0;
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-h2);
}

.about-section__grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.about-section__grid--reverse {
  flex-direction: column-reverse;
}

.about-section__text {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.about-section__body {
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--color-silver);
  margin: 0;
  max-width: 640px;
}

.about-section__card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(192,192,192,0.15);
  border-radius: var(--about-card-radius);
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.about-section__img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 400px;
  object-fit: cover;
  border-radius: 2px;
}

.about-section__img--portrait {
  max-height: 300px;
}

.about-section__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-sm);
}

/* ===== Icon Grid 图标网格 ===== */
.about-icon-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  width: 100%;
}

.about-icon-grid__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md) var(--spacing-sm);
  background: rgba(255,107,53,0.06);
  border: 1px solid rgba(255,107,53,0.15);
  border-radius: var(--about-card-radius);
  transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
  cursor: default;
}

.about-icon-grid__item:hover,
.about-icon-grid__item:focus-within {
  transform: scale(1.06);
  box-shadow: 0 4px 20px rgba(255,107,53,0.2);
}

.about-icon-grid__num {
  font-family: var(--font-heading);
  font-size: var(--font-size-h2);
  font-weight: 700;
  font-style: italic;
  color: var(--color-accent);
  line-height: 1;
}

.about-icon-grid__label {
  font-family: var(--font-heading);
  font-size: var(--font-size-h3);
  font-weight: 600;
  color: var(--color-white);
}

.about-icon-grid__tag {
  font-size: var(--font-size-index);
  color: var(--color-silver);
  background: rgba(192,192,192,0.12);
  padding: 2px 8px;
}

/* ===== Details / Summary 展开 ===== */
.about-details {
  border: 1px solid rgba(192,192,192,0.15);
  border-radius: var(--about-card-radius);
  background: rgba(255,255,255,0.03);
  max-width: 640px;
}

.about-details__summary {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-index);
  font-size: var(--font-size-index);
  color: var(--color-accent);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.about-details__summary::-webkit-details-marker {
  display: none;
}

.about-details__summary:hover {
  background: rgba(255,107,53,0.08);
}

.about-details__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-accent);
  transition: transform var(--transition-speed) ease;
}

.about-details[open] .about-details__icon {
  transform: rotate(45deg);
}

.about-details__content {
  padding: 0 var(--spacing-md) var(--spacing-md);
  animation: aboutFadeIn 0.3s ease;
}

@keyframes aboutFadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.about-details__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.about-details__list li {
  font-family: var(--font-body);
  font-size: var(--font-size-small);
  line-height: 1.5;
  color: var(--color-silver);
  padding-left: var(--spacing-sm);
  border-left: 2px solid var(--color-accent);
}

.about-details__note {
  font-family: var(--font-body);
  font-size: var(--font-size-small);
  color: var(--color-silver);
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid rgba(192,192,192,0.15);
}

/* ===== Archive Note 档案脚注 ===== */
.about-archive-note {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-xl) var(--spacing-md);
  text-align: center;
}

.about-archive-note__text {
  font-family: var(--font-body);
  font-size: var(--font-size-small);
  color: var(--color-silver);
  margin: 0;
  max-width: 480px;
}

/* ===== 桌面端媒体查询 ===== */
@media (min-width: 768px) {
  .about-hero {
    min-height: 70vh;
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .about-hero__inner {
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-xl);
  }

  .about-hero__text {
    flex: 1;
  }

  .about-hero__visual {
    flex: 0 0 45%;
    max-width: 600px;
  }

  .about-hero__values {
    gap: var(--spacing-lg);
  }

  .about-hero__value {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .about-path__svg {
    max-height: 100px;
  }

  .about-section {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .about-section__grid {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--spacing-xl);
  }

  .about-section__grid--reverse {
    flex-direction: row-reverse;
  }

  .about-section__text {
    flex: 1;
    max-width: 50%;
  }

  .about-section__card {
    flex: 1;
    max-width: 50%;
    padding: var(--spacing-lg);
  }

  .about-icon-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
  }

  .about-icon-grid__item {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .about-section__links {
    gap: var(--spacing-md);
  }

  .about-connector__line {
    height: 64px;
  }

  .about-connector__dot {
    width: 14px;
    height: 14px;
  }

  .about-archive-note {
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-xxl, 4rem);
  }
}

@media (min-width: 1024px) {
  .about-hero__inner {
    gap: var(--spacing-xxl, 4rem);
  }

  .about-hero__brand {
    font-size: var(--about-hero-font-scale);
  }

  .about-section__title {
    font-size: var(--font-size-h1);
  }

  .about-section__body {
    font-size: var(--font-size-h3);
    line-height: 1.7;
  }
}

/* ===== prefers-reduced-motion ===== */
@media (prefers-reduced-motion: reduce) {
  .about-hero__value,
  .about-icon-grid__item {
    transition: none;
  }

  .about-hero__value:hover,
  .about-icon-grid__item:hover {
    transform: none;
  }

  .about-details__content {
    animation: none;
  }

  .about-details__icon {
    transition: none;
  }
}

.page-about {
  --spacing-xxl: 1rem;
}