.page-about {
  --color-accent-voice: var(--color-accent1, #D32F2F);
  --color-gold-soft: var(--color-accent2, #FFD700);
  --color-ink: var(--color-text-dark, #1A3E6B);
  --color-paper: var(--color-secondary, #F5F5F5);
  --color-stone: var(--color-neutral1, #8B8682);
  --color-clay: var(--color-neutral3, #C4A882);
  --color-moss: var(--color-neutral2, #5C7A5A);
  --color-deep: var(--color-primary, #1A3E6B);
  --color-deep-light: var(--color-primary-light, #2A5280);
  --color-bg-card: #FFFFFF;
  --card-radius: var(--radius-md, 4px);
  --card-shadow: var(--shadow-card, 0 4px 16px rgba(13,27,42,0.08));
  --card-shadow-hover: var(--shadow-card-hover, 0 8px 32px rgba(13,27,42,0.14));

  background-color: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body, "Noto Sans SC", sans-serif);
  line-height: var(--lh-body, 1.8);
  letter-spacing: var(--ls-body, 0.05em);
  overflow-x: hidden;
}

/* ── 面包屑 ── */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-xs, 0.35rem);
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: var(--space-md, 1.25rem) var(--space-lg, 2.5rem) 0;
  font-size: var(--fs-small, 0.85rem);
  color: var(--color-stone);
}
.page-about .breadcrumb a {
  color: var(--color-deep);
  text-decoration: none;
  transition: color var(--transition-fast, 0.2s ease);
}
.page-about .breadcrumb a:hover {
  color: var(--color-accent-voice);
}
.page-about .breadcrumb__sep {
  color: var(--color-stone);
  margin: 0 var(--space-xs);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--color-ink);
  font-weight: var(--fw-bold, 600);
}

/* ── 章节编号 ── */
.page-about .section-number {
  display: block;
  font-family: var(--font-heading, Inter, sans-serif);
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: var(--fw-heading, 700);
  letter-spacing: var(--ls-heading, -0.5px);
  line-height: 1;
  color: var(--color-clay);
  opacity: 0.6;
  user-select: none;
}
.page-about .section-title {
  display: block;
  font-family: var(--font-heading, Inter, sans-serif);
  font-size: var(--fs-heading-xl, clamp(2.5rem, 5vw, 4.5rem));
  font-weight: var(--fw-heading, 700);
  letter-spacing: var(--ls-heading, -0.5px);
  line-height: 1.15;
  color: var(--color-ink);
  margin-top: var(--space-xs, 0.35rem);
}

/* ===== 01 品牌根脉 ===== */
.page-about .about-hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin: 0 0 var(--space-2xl, 6rem);
}
.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
}
.page-about .about-hero__overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(135deg, rgba(13,27,42,0.82) 0%, rgba(26,62,107,0.55) 50%, rgba(13,27,42,0.70) 100%);
}
.page-about .about-hero__content {
  position: relative;
  z-index: 2;
  max-width: var(--max-width, 1200px);
  width: 100%;
  padding: var(--space-xl, 4rem) var(--space-lg, 2.5rem);
  color: var(--color-text-light, #F5F5F5);
}
.page-about .about-hero__heading {
  margin: 0 0 var(--space-md, 1.25rem);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.page-about .section-number--hero {
  color: var(--color-clay);
  opacity: 0.8;
  font-size: clamp(3.2rem, 7vw, 6rem);
}
.page-about .section-title--hero {
  color: var(--color-text-light, #F5F5F5);
  font-size: var(--fs-heading-xl, clamp(2.5rem, 5vw, 4.5rem));
  margin-top: var(--space-xs, 0.35rem);
}
.page-about .about-hero__text {
  max-width: 64ch;
  font-size: var(--fs-body, clamp(0.95rem, 1.2vw, 1.05rem));
  line-height: var(--lh-body, 1.8);
  margin: var(--space-lg, 2.5rem) 0 var(--space-md, 1.25rem);
  color: rgba(255,255,255,0.92);
}
.page-about .about-hero__connection {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: var(--space-md, 1.25rem);
  padding: var(--space-md, 1.25rem) var(--space-lg, 2.5rem);
  background: rgba(255,255,255,0.08);
  border-left: 3px solid var(--color-gold-soft);
  border-radius: var(--card-radius);
  max-width: 64ch;
}
.page-about .about-hero__connection .tag {
  flex-shrink: 0;
  background: var(--color-gold-soft);
  color: var(--color-deep);
  font-weight: var(--fw-bold, 600);
  font-size: var(--fs-small, 0.85rem);
  padding: var(--space-xs, 0.35rem) var(--space-sm, 0.65rem);
  border-radius: var(--radius-sm, 2px);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.page-about .about-hero__connection p {
  flex: 1;
  min-width: 20ch;
  margin: 0;
  font-size: var(--fs-small, 0.85rem);
  line-height: 1.7;
  color: rgba(255,255,255,0.85);
}

/* ===== 02 服务哲学 ===== */
.page-about .about-philosophy {
  max-width: var(--max-width, 1200px);
  margin: 0 auto var(--space-2xl, 6rem);
  padding: 0 var(--space-lg, 2.5rem);
}
.page-about .about-philosophy__header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-bottom: var(--space-md, 1.25rem);
}
.page-about .about-philosophy__intro {
  max-width: 56ch;
  font-size: var(--fs-body, clamp(0.95rem, 1.2vw, 1.05rem));
  color: var(--color-stone);
  margin: 0 0 var(--space-xl, 4rem);
  line-height: var(--lh-body, 1.8);
}
.page-about .about-philosophy__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--grid-gap, var(--space-lg, 2.5rem));
}

/* 哲学卡片 */
.page-about .philosophy-card {
  background: var(--color-bg-card);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  padding: var(--space-lg, 2.5rem) var(--space-md, 1.25rem);
  transition: box-shadow var(--transition-med, 0.35s ease), transform var(--transition-med, 0.35s ease);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  border: 1px solid rgba(139,134,130,0.12);
}
.page-about .philosophy-card:hover {
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-3px);
}
.page-about .philosophy-card__media {
  position: relative;
  width: 100%;
  max-width: 200px;
  aspect-ratio: 1/1;
  margin: 0 auto var(--space-md, 1.25rem);
  border-radius: var(--radius-sm, 2px);
  overflow: hidden;
  background: var(--color-paper);
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about .philosophy-card__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform var(--transition-med, 0.35s ease);
}
.page-about .philosophy-card:hover .philosophy-card__img {
  transform: scale(1.06);
}
.page-about .philosophy-card__hover {
  position: absolute;
  inset: 0;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm, 0.65rem);
  opacity: 0;
  transition: opacity var(--transition-med, 0.35s ease);
}
.page-about .philosophy-card:hover .philosophy-card__hover {
  opacity: 1;
}
.page-about .philosophy-card__dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  transition: transform var(--transition-med, 0.35s ease), background var(--transition-med, 0.35s ease);
}
.page-about .philosophy-card__dot--a {
  background: var(--color-deep);
  transform: translateX(-8px);
}
.page-about .philosophy-card__dot--b {
  background: var(--color-accent-voice);
  transform: translateX(8px);
}
.page-about .philosophy-card:hover .philosophy-card__dot--a {
  transform: translateX(-2px) scale(1.15);
}
.page-about .philosophy-card:hover .philosophy-card__dot--b {
  transform: translateX(2px) scale(1.15);
}
.page-about .philosophy-card__label {
  font-family: var(--font-accent, Oswald, sans-serif);
  font-size: var(--fs-small, 0.85rem);
  font-weight: var(--fw-bold, 600);
  color: var(--color-accent-voice);
  letter-spacing: 0.08em;
  margin-left: var(--space-xs, 0.35rem);
}
.page-about .philosophy-card__media--sync,
.page-about .philosophy-card__media--speed {
  background: var(--color-paper);
  position: relative;
}
.page-about .philosophy-card__sync-icon {
  position: relative;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about .sync-ring {
  display: block;
  width: 48px;
  height: 48px;
  border: 3px solid var(--color-deep);
  border-top-color: var(--color-accent-voice);
  border-radius: 50%;
  transition: transform var(--transition-med, 0.35s ease);
}
.page-about .philosophy-card:hover .sync-ring {
  transform: rotate(180deg);
}
.page-about .philosophy-card__speed-icon {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 48px;
}
.page-about .speed-bar {
  display: block;
  width: 10px;
  background: var(--color-deep);
  border-radius: 2px 2px 0 0;
  transition: height var(--transition-med, 0.35s ease);
}
.page-about .speed-bar--1 { height: 24px; }
.page-about .speed-bar--2 { height: 36px; }
.page-about .speed-bar--3 { height: 48px; }
.page-about .philosophy-card:hover .speed-bar--1 { height: 32px; }
.page-about .philosophy-card:hover .speed-bar--2 { height: 42px; }
.page-about .philosophy-card:hover .speed-bar--3 { height: 52px; }
.page-about .philosophy-card__title {
  font-family: var(--font-heading, Inter, sans-serif);
  font-size: var(--fs-heading-md, clamp(1.25rem, 2.5vw, 1.75rem));
  font-weight: var(--fw-heading, 700);
  letter-spacing: var(--ls-heading, -0.5px);
  color: var(--color-ink);
  margin: 0 0 var(--space-sm, 0.65rem);
  line-height: 1.25;
}
.page-about .philosophy-card__desc {
  font-size: var(--fs-body, clamp(0.95rem, 1.2vw, 1.05rem));
  color: var(--color-stone);
  line-height: var(--lh-body, 1.8);
  margin: 0 0 var(--space-md, 1.25rem);
  flex: 1;
}
.page-about .philosophy-card .btn {
  align-self: flex-start;
  font-family: var(--font-body, "Noto Sans SC", sans-serif);
  font-size: var(--fs-small, 0.85rem);
  padding: var(--space-sm, 0.65rem) var(--space-md, 1.25rem);
  border: 1px solid var(--color-deep);
  color: var(--color-deep);
  background: transparent;
  border-radius: var(--radius-sm, 2px);
  text-decoration: none;
  transition: background var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease);
  cursor: pointer;
}
.page-about .philosophy-card .btn:hover {
  background: var(--color-deep);
  color: var(--color-text-light, #F5F5F5);
}

/* ===== 03 用户之声 ===== */
.page-about .about-voice {
  max-width: var(--max-width, 1200px);
  margin: 0 auto var(--space-2xl, 6rem);
  padding: 0 var(--space-lg, 2.5rem);
}
.page-about .about-voice__header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-bottom: var(--space-md, 1.25rem);
}
.page-about .about-voice__intro {
  max-width: 56ch;
  font-size: var(--fs-body, clamp(0.95rem, 1.2vw, 1.05rem));
  color: var(--color-stone);
  margin: 0 0 var(--space-xl, 4rem);
  line-height: var(--lh-body, 1.8);
}
.page-about .about-voice__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--grid-gap, var(--space-lg, 2.5rem));
  align-items: start;
}

/* 语音切换器 */
.page-about .voice-switcher {
  position: relative;
  width: 100%;
}
.page-about .voice-radio {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}
.page-about .voice-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-md, 1.25rem);
}
.page-about .voice-card {
  background: var(--color-bg-card);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  border: 1px solid rgba(139,134,130,0.10);
  transition: box-shadow var(--transition-med, 0.35s ease), border-color var(--transition-med, 0.35s ease);
}
.page-about .voice-card:has(.voice-radio:checked) {
  box-shadow: var(--card-shadow-hover);
  border-color: var(--color-clay);
}
.page-about .voice-card__trigger {
  display: block;
  padding: var(--space-md, 1.25rem) var(--space-lg, 2.5rem);
  cursor: pointer;
  transition: background var(--transition-fast, 0.2s ease);
  border-radius: var(--card-radius);
  user-select: none;
}
.page-about .voice-card__trigger:hover {
  background: rgba(196,168,130,0.06);
}
.page-about .voice-radio:checked ~ .voice-card__trigger {
  background: rgba(196,168,130,0.10);
  border-bottom: 1px solid rgba(196,168,130,0.25);
  border-radius: var(--card-radius) var(--card-radius) 0 0;
}
.page-about .voice-card__icon {
  font-family: var(--font-heading, Inter, sans-serif);
  font-size: var(--fs-heading-lg, clamp(1.75rem, 3.5vw, 2.75rem));
  line-height: 1;
  color: var(--color-clay);
  display: block;
  margin-bottom: var(--space-xs, 0.35rem);
}
.page-about .voice-card__summary {
  display: block;
  font-family: var(--font-heading, Inter, sans-serif);
  font-size: var(--fs-heading-md, clamp(1.25rem, 2.5vw, 1.75rem));
  font-weight: var(--fw-heading, 700);
  letter-spacing: var(--ls-heading, -0.5px);
  color: var(--color-ink);
  margin: 0 0 var(--space-xs, 0.35rem);
}
.page-about .voice-card__author {
  display: block;
  font-size: var(--fs-small, 0.85rem);
  color: var(--color-stone);
  font-style: italic;
}
.page-about .voice-card__body {
  display: none;
  padding: 0 var(--space-lg, 2.5rem) var(--space-lg, 2.5rem);
  font-size: var(--fs-body, clamp(0.95rem, 1.2vw, 1.05rem));
  color: var(--color-ink);
  line-height: var(--lh-body, 1.8);
}
.page-about .voice-card__body p {
  margin: 0;
}
.page-about #voice-fb1:checked ~ .voice-cards .voice-card:nth-child(1) .voice-card__body,
.page-about #voice-fb2:checked ~ .voice-cards .voice-card:nth-child(2) .voice-card__body,
.page-about #voice-fb3:checked ~ .voice-cards .voice-card:nth-child(3) .voice-card__body {
  display: block;
}

/* 语音区图片 */
.page-about .about-voice__image {
  width: 100%;
  border-radius: var(--card-radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  background: var(--color-paper);
}
.page-about .about-voice__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 6/4;
}
.page-about .about-voice__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md, 1.25rem);
  margin-top: var(--space-xl, 4rem);
  padding: var(--space-lg, 2.5rem);
  background: linear-gradient(135deg, var(--color-deep) 0%, var(--color-deep-light) 100%);
  border-radius: var(--card-radius);
  color: var(--color-text-light, #F5F5F5);
}
.page-about .about-voice__cta p {
  flex: 1;
  min-width: 22ch;
  margin: 0;
  font-size: var(--fs-body, clamp(0.95rem, 1.2vw, 1.05rem));
  line-height: 1.7;
  color: rgba(255,255,255,0.92);
}
.page-about .about-voice__cta .btn--primary {
  flex-shrink: 0;
  font-family: var(--font-body, "Noto Sans SC", sans-serif);
  font-size: var(--fs-body, clamp(0.95rem, 1.2vw, 1.05rem));
  font-weight: var(--fw-bold, 600);
  padding: var(--space-sm, 0.65rem) var(--space-lg, 2.5rem);
  background: var(--color-accent-voice);
  color: var(--color-text-light, #F5F5F5);
  border: none;
  border-radius: var(--radius-sm, 2px);
  text-decoration: none;
  transition: background var(--transition-fast, 0.2s ease), transform var(--transition-fast, 0.2s ease);
  cursor: pointer;
  display: inline-block;
  text-align: center;
}
.page-about .about-voice__cta .btn--primary:hover {
  background: #B71C1C;
  transform: translateY(-1px);
}

/* ===== data-reveal 滚动显现 ===== */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--transition-slow, 0.5s ease), transform var(--transition-slow, 0.5s ease);
}
@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* ===== 响应式 - 桌面 ===== */
@media (min-width: 768px) {
  .page-about .about-hero__content {
    padding: var(--space-2xl, 6rem) var(--space-xl, 4rem);
  }
  .page-about .about-hero__text {
    font-size: calc(var(--fs-body, 1rem) * 1.08);
  }
  .page-about .about-hero__connection {
    padding: var(--space-md, 1.25rem) var(--space-lg, 2.5rem);
  }
  .page-about .about-philosophy__grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .philosophy-card {
    padding: var(--space-lg, 2.5rem);
  }
  .page-about .philosophy-card__media {
    max-width: 160px;
  }
  .page-about .about-voice__layout {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .about-voice__image {
    position: sticky;
    top: var(--space-lg, 2.5rem);
  }
  .page-about .about-voice__cta {
    flex-wrap: nowrap;
    padding: var(--space-lg, 2.5rem) var(--space-xl, 4rem);
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    min-height: 85vh;
  }
  .page-about .about-hero__content {
    padding: var(--space-2xl, 6rem) var(--space-2xl, 6rem);
  }
  .page-about .about-philosophy {
    padding: 0 var(--space-xl, 4rem);
  }
  .page-about .about-voice {
    padding: 0 var(--space-xl, 4rem);
  }
  .page-about .philosophy-card__media {
    max-width: 180px;
  }
}

/* ===== 窄屏安全 ===== */
@media (max-width: 420px) {
  .page-about .breadcrumb {
    padding: var(--space-sm, 0.65rem) var(--space-md, 1.25rem) 0;
    font-size: 0.78rem;
  }
  .page-about .about-hero__content {
    padding: var(--space-lg, 2.5rem) var(--space-md, 1.25rem);
  }
  .page-about .about-philosophy {
    padding: 0 var(--space-md, 1.25rem);
  }
  .page-about .about-voice {
    padding: 0 var(--space-md, 1.25rem);
  }
  .page-about .about-hero__connection {
    padding: var(--space-sm, 0.65rem) var(--space-md, 1.25rem);
    flex-direction: column;
  }
  .page-about .voice-card__trigger {
    padding: var(--space-sm, 0.65rem) var(--space-md, 1.25rem);
  }
  .page-about .voice-card__body {
    padding: 0 var(--space-md, 1.25rem) var(--space-md, 1.25rem);
  }
  .page-about .about-voice__cta {
    padding: var(--space-md, 1.25rem);
    flex-direction: column;
    text-align: center;
  }
  .page-about .about-voice__cta .btn--primary {
    width: 100%;
  }
  .page-about .philosophy-card {
    padding: var(--space-md, 1.25rem);
  }
}