/* =========================================================
   PAGE: ABOUT 品牌故事
   作用域：.page-about
   ========================================================= */
.page-about {
  --about-rule: rgba(26, 75, 140, 0.16);
  --about-dark-section: linear-gradient(155deg, #0a2033 0%, #0e2a40 58%, #12304a 100%);
  --about-gap: 64px;
}

/* ===== 首屏 ===== */
.page-about__hero {
  background: linear-gradient(180deg, #dfeaf5 0%, #f7f9fc 100%);
  padding: 28px 0 60px;
  border-bottom: 1px solid var(--about-rule);
}

.page-about__breadcrumb {
  margin-bottom: 28px;
}

.page-about__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.page-about__hero-copy h1 {
  margin: 14px 0 22px;
  font-family: var(--font-heading);
  font-size: clamp(30px, 6vw, 54px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--color-primary);
}

.page-about__hero-intro {
  margin: 0 0 28px;
  max-width: 46em;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-text);
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about__hero-media {
  margin: 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-float);
}

.page-about__hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
}

/* ===== 品牌起源 ===== */
.page-about__origin {
  background: #ffffff;
  padding: var(--about-gap) 0;
}

.page-about__origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about__origin-aside {
  border-left: 3px solid var(--color-primary);
  padding-left: 20px;
}

.page-about__origin-aside .section-label {
  margin-bottom: 12px;
}

.page-about__origin-aside h2 {
  margin: 0 0 8px;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1.2;
  color: var(--color-primary);
}

.page-about__origin-aside .meta-note {
  margin-top: 24px;
}

.page-about__origin-copy p {
  margin: 0 0 18px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-text);
}

.page-about__origin-quote {
  margin: 28px 0;
  padding: 22px 24px;
  border-radius: var(--radius-card);
  background: var(--color-gray);
  border-left: 4px solid var(--color-accent);
}

.page-about__origin-quote p {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--color-deep);
}

.page-about__origin-quote cite {
  font-style: normal;
  font-family: var(--font-heading);
  font-size: 13px;
  color: var(--color-muted);
}

/* ===== 发展里程碑 ===== */
.page-about__milestones {
  padding: var(--about-gap) 0;
  background: #eef4fa;
}

.page-about__milestones-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.page-about__milestones-title .section-label {
  margin-bottom: 12px;
}

.page-about__milestones-title h2 {
  margin: 0;
  font-size: clamp(26px, 4vw, 38px);
  color: var(--color-primary);
}

.page-about__milestones-note {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about__milestones-figure {
  margin: 0 0 44px;
  aspect-ratio: 8 / 5;
  overflow: hidden;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

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

.page-about__timeline {
  position: relative;
  padding-top: 4px;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: var(--color-primary);
  opacity: 0.28;
}

.page-about__milestone {
  position: relative;
  padding-left: 44px;
  padding-bottom: 48px;
}

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

.page-about__milestone::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 4px solid #ffffff;
  box-shadow: 0 0 0 2px var(--color-accent);
}

.page-about__milestone-year {
  margin-bottom: 8px;
  font-family: var(--font-heading);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
}

.page-about__milestone-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 700;
  color: var(--color-deep);
}

.page-about__milestone-body p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
}

.page-about__details {
  margin-top: 14px;
  border-top: 1px dashed rgba(26, 75, 140, 0.22);
  padding-top: 12px;
}

.page-about__details summary {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  transition: color var(--transition);
}

.page-about__details summary::-webkit-details-marker {
  display: none;
}

.page-about__details summary::marker {
  content: "";
}

.page-about__details summary::after {
  content: "+";
  font-size: 16px;
  line-height: 1;
  transition: transform var(--transition);
}

.page-about__details[open] summary::after {
  content: "−";
}

.page-about__details summary:hover {
  color: var(--color-accent-dark);
}

.page-about__details p {
  margin: 12px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--color-glacier);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-muted);
}

/* ===== 服务理念 ===== */
.page-about__philosophy {
  padding: var(--about-gap) 0;
  background: #e4eef6;
}

.page-about__philosophy-head {
  margin-bottom: 28px;
}

.page-about__philosophy-head .section-label {
  margin-bottom: 12px;
}

.page-about__philosophy-head h2 {
  margin: 0;
  font-size: clamp(26px, 4vw, 38px);
  color: var(--color-primary);
}

.page-about__philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about__philosophy-card {
  padding: 26px 24px;
  border-radius: var(--radius-card);
  border: 1px solid rgba(26, 75, 140, 0.08);
  box-shadow: var(--shadow-card);
}

.page-about__philosophy-index {
  display: inline-block;
  margin-bottom: 14px;
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-gold);
  line-height: 1;
}

.page-about__philosophy-card h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--color-deep);
}

.page-about__philosophy-card p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
}

.page-about__philosophy-card a {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ===== 地域融合 ===== */
.page-about__culture {
  padding: var(--about-gap) 0;
  background: #ffffff;
}

.page-about__culture-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.page-about__culture-copy .section-label {
  margin-bottom: 12px;
}

.page-about__culture-copy h2 {
  margin: 0 0 18px;
  font-size: clamp(26px, 4vw, 38px);
  color: var(--color-primary);
}

.page-about__culture-copy p {
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
}

.page-about__culture-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  gap: 12px;
}

.page-about__culture-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-deep);
  background: var(--color-gray);
  border-radius: var(--radius-tag);
}

.page-about__culture-swatch {
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08);
}

.page-about__culture-swatch--primary {
  background: var(--color-primary);
}

.page-about__culture-swatch--glacier {
  background: var(--color-glacier);
}

.page-about__culture-swatch--accent {
  background: var(--color-accent);
}

.page-about__culture-figure {
  margin: 0;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-float);
}

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

/* ===== 用户与规模 ===== */
.page-about__scale {
  background: var(--about-dark-section);
  padding: var(--about-gap) 0;
  color: #ffffff;
}

.page-about__scale-head {
  margin-bottom: 32px;
}

.page-about__scale-head .section-label {
  background: rgba(255, 255, 255, 0.14);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.page-about__scale-head h2 {
  margin: 0;
  font-size: clamp(26px, 4vw, 38px);
  color: #ffffff;
}

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

.page-about__stat {
  padding: 26px 14px;
  text-align: center;
  border-radius: var(--radius-card);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.page-about__stat-num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-heading);
  font-size: clamp(22px, 6vw, 44px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: #ffffff;
}

.page-about__stat-label {
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.7);
}

/* ===== 资质与信任 ===== */
.page-about__trust {
  padding: var(--about-gap) 0;
  background: #102d45;
  color: #ffffff;
}

.page-about__trust-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about__trust-head .section-label {
  background: rgba(255, 255, 255, 0.14);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.page-about__trust-head h2 {
  margin: 0 0 16px;
  font-size: clamp(26px, 4vw, 38px);
  color: #ffffff;
}

.page-about__trust-head p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.72);
}

.page-about__trust-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about__trust-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: start;
  padding: 24px;
  border-radius: var(--radius-card);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.page-about__trust-item .tag {
  margin-top: 4px;
  background: rgba(212, 160, 23, 0.16);
  color: #d4a017;
  border: 1px solid rgba(212, 160, 23, 0.35);
  padding: 6px 14px;
  border-radius: var(--radius-tag);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.page-about__trust-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 700;
  color: #ffffff;
}

.page-about__trust-item p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.72);
}

/* ===== 底部横幅 ===== */
.page-about__banner {
  padding: 48px 0;
  background: var(--color-white);
  border-top: 1px solid var(--about-rule);
}

.page-about__banner-inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
  align-items: flex-start;
  padding: 32px 28px;
  border-radius: var(--radius-card);
  background: linear-gradient(135deg, #e3edf7 0%, #f8fafc 80%);
  box-shadow: var(--shadow-card);
}

.page-about__banner-copy h2 {
  margin: 0 0 8px;
  font-size: clamp(22px, 3vw, 30px);
  color: var(--color-primary);
}

.page-about__banner-copy p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  color: var(--color-text);
}

.page-about__banner-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* =========================================================
   桌面端增强
   ========================================================= */
@media (min-width: 768px) {
  .page-about {
    --about-gap: 100px;
  }

  .page-about__hero {
    padding: 40px 0 80px;
  }

  .page-about__hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
  }

  .page-about__hero-copy h1 {
    font-size: clamp(38px, 4.4vw, 54px);
  }

  .page-about__hero-media {
    aspect-ratio: 4 / 3;
  }

  .page-about__origin-grid {
    grid-template-columns: 0.44fr 0.56fr;
    gap: 80px;
  }

  .page-about__origin-aside {
    padding-left: 28px;
  }

  .page-about__milestones-head {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 36px;
  }

  .page-about__milestones-note {
    text-align: right;
  }

  .page-about__timeline::before {
    left: 148px;
  }

  .page-about__milestone {
    padding-left: 170px;
    padding-bottom: 56px;
  }

  .page-about__milestone::before {
    left: 139px;
    top: 6px;
    width: 18px;
    height: 18px;
  }

  .page-about__milestone-year {
    position: absolute;
    left: 0;
    top: -2px;
    width: 120px;
    text-align: right;
    font-size: 34px;
    margin: 0;
  }

  .page-about__philosophy-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about__culture-grid {
    grid-template-columns: 0.55fr 0.45fr;
    gap: 72px;
  }

  .page-about__stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px 28px;
  }

  .page-about__stat {
    padding: 36px 20px;
  }

  .page-about__trust-grid {
    grid-template-columns: 0.4fr 0.6fr;
    gap: 72px;
  }

  .page-about__banner-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 36px 40px;
  }
}