/* ===== 品牌概况页专属样式 ===== */
.page-about {
  --about-gap: 2rem;
  --about-manifesto-width: 38%;
  --accent-alpha: rgba(255, 107, 53, 0.08);
  --card-stack-offset: 1.25rem;
  --speedline-color: rgba(255, 107, 53, 0.25);
  display: block;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
  font-family: var(--font-body);
  color: var(--color-text);
  position: relative;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--color-silver);
  margin-bottom: 1.5rem;
  padding: 0.25rem 0;
}
.page-about .breadcrumb a {
  color: var(--color-silver);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus {
  color: var(--color-accent);
}
.page-about .breadcrumb__sep {
  flex-shrink: 0;
  color: var(--color-silver);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--color-accent);
  font-weight: 600;
}

/* ---------- 主布局：左侧宣言 + 右侧卡片 ---------- */
.page-about .about-layout {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
  position: relative;
}

/* ===== 左侧品牌宣言 ===== */
.page-about .about-manifesto {
  position: relative;
  padding: 1.5rem 0;
  overflow: hidden;
}
.page-about .manifesto-visual {
  position: relative;
  width: 100%;
  max-width: 600px;
  margin: 0 auto 1.5rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transform: skewX(-1.5deg);
  transition: transform var(--transition-base);
}
.page-about .manifesto-visual:hover {
  transform: skewX(0deg) scale(1.01);
}
.page-about .manifesto-image {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 600 / 400;
}
.page-about .manifesto-badge {
  position: absolute;
  bottom: -0.5rem;
  right: -0.5rem;
  width: 72px;
  height: 72px;
  filter: drop-shadow(0 2px 8px rgba(255, 107, 53, 0.3));
  animation: badgePulse 3s ease-in-out infinite;
}
@keyframes badgePulse {
  0%, 100% { transform: scale(1) rotate(0deg); }
  50% { transform: scale(1.06) rotate(4deg); }
}
.page-about .badge-outer {
  stroke-dasharray: 240;
  stroke-dashoffset: 0;
  animation: badgeDraw 2s ease-out forwards;
}
.page-about .badge-inner {
  stroke-dasharray: 160;
  stroke-dashoffset: 0;
  animation: badgeDraw 1.6s ease-out 0.3s forwards;
}
.page-about .badge-cross {
  opacity: 0.4;
  animation: badgeFade 2s ease-out 0.6s forwards;
}
.page-about .badge-dot {
  animation: badgeGlow 2.5s ease-in-out infinite alternate;
}
@keyframes badgeDraw {
  from { stroke-dashoffset: 240; }
  to { stroke-dashoffset: 0; }
}
@keyframes badgeFade {
  from { opacity: 0; }
  to { opacity: 0.4; }
}
@keyframes badgeGlow {
  from { r: 6; opacity: 0.8; }
  to { r: 9; opacity: 1; }
}

.page-about .manifesto-heading {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 6vw, 3.2rem);
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 0.25rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
  position: relative;
  display: inline-block;
}
.page-about .manifesto-heading::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: var(--color-accent);
  margin-top: 0.35rem;
  border-radius: 2px;
}
.page-about .manifesto-subhead {
  font-family: var(--font-heading);
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  font-weight: 400;
  color: var(--color-accent);
  margin: 0.5rem 0 1rem;
  letter-spacing: 0.04em;
}
.page-about .manifesto-lines {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}
.page-about .manifesto-line {
  font-size: clamp(0.92rem, 1.8vw, 1.05rem);
  line-height: 1.6;
  color: var(--color-text);
  margin: 0;
  padding-left: 1rem;
  border-left: 3px solid var(--color-accent);
  opacity: 0;
  transform: translateX(-12px);
  animation: lineReveal 0.6s ease-out forwards;
}
.page-about .manifesto-line--1 { animation-delay: 0.2s; }
.page-about .manifesto-line--2 { animation-delay: 0.5s; }
.page-about .manifesto-line--3 { animation-delay: 0.8s; }
@keyframes lineReveal {
  to { opacity: 1; transform: translateX(0); }
}

/* 速度线装饰（宣言区） */
.page-about .manifesto-speedlines {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}
.page-about .manifesto-speedlines .speedline {
  position: absolute;
  height: 1.5px;
  background: var(--speedline-color);
  border-radius: 1px;
  opacity: 0;
  animation: speedDash 2.5s ease-out forwards;
}
.page-about .manifesto-speedlines .speedline--1 {
  width: 180px;
  top: 10%;
  right: -40px;
  transform: rotate(-8deg);
  animation-delay: 0.3s;
}
.page-about .manifesto-speedlines .speedline--2 {
  width: 120px;
  top: 45%;
  right: -20px;
  transform: rotate(4deg);
  animation-delay: 0.8s;
}
.page-about .manifesto-speedlines .speedline--3 {
  width: 200px;
  bottom: 20%;
  right: -60px;
  transform: rotate(-12deg);
  animation-delay: 1.3s;
}
@keyframes speedDash {
  0% { opacity: 0; transform: translateX(40px) rotate(-8deg); }
  40% { opacity: 0.6; }
  100% { opacity: 0.25; transform: translateX(-20px) rotate(-8deg); }
}

/* ===== 右侧功能卡片堆叠 ===== */
.page-about .about-features {
  position: relative;
  padding: 0.5rem 0;
  z-index: 1;
}
.page-about .features-heading {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 3.5vw, 1.9rem);
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 1.5rem;
  letter-spacing: -0.01em;
  position: relative;
  display: inline-block;
}
.page-about .features-heading::after {
  content: '';
  display: block;
  width: 36px;
  height: 3px;
  background: var(--color-accent);
  margin-top: 0.3rem;
  border-radius: 2px;
}

/* 卡片容器 */
.page-about .feature-card {
  position: relative;
  margin-bottom: var(--card-stack-offset);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  background: var(--color-white);
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(192, 192, 192, 0.3);
}
.page-about .feature-card:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-accent);
}
.page-about .feature-card:last-child {
  margin-bottom: 0;
}

/* 每个卡片偏移叠放 */
.page-about .feature-card--stats {
  z-index: 3;
  margin-right: 0;
}
.page-about .feature-card--vehicle {
  z-index: 2;
  margin-left: var(--card-stack-offset);
  margin-right: calc(var(--card-stack-offset) * 0.5);
}
.page-about .feature-card--network {
  z-index: 1;
  margin-left: calc(var(--card-stack-offset) * 1.6);
  margin-right: calc(var(--card-stack-offset) * 0.2);
}

.page-about .feature-card__inner {
  display: flex;
  flex-direction: column;
  padding: 1.25rem 1.5rem 1.5rem;
  position: relative;
}
.page-about .feature-card__face {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.page-about .feature-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--accent-alpha);
  border-radius: 8px;
  margin-bottom: 0.25rem;
  transition: background var(--transition-fast);
}
.page-about .feature-card:hover .feature-card__icon {
  background: rgba(255, 107, 53, 0.18);
}
.page-about .feature-card__title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0;
  letter-spacing: -0.01em;
}
.page-about .feature-card__summary {
  font-size: 0.9rem;
  color: var(--color-silver);
  margin: 0.15rem 0 0;
}
.page-about .feature-card__detail {
  display: none;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(192, 192, 192, 0.25);
  animation: detailSlide 0.35s ease-out;
}
@keyframes detailSlide {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}
.page-about .feature-card:hover .feature-card__detail,
.page-about .feature-card:focus-within .feature-card__detail {
  display: flex;
}
.page-about .feature-card__desc {
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--color-text);
  margin: 0;
}
.page-about .feature-card__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
  aspect-ratio: 400 / 200;
}
.page-about .feature-card__img--network {
  aspect-ratio: 300 / 300;
  max-width: 220px;
}
.page-about .feature-card .btn-outline {
  align-self: flex-start;
  margin-top: 0.25rem;
  font-size: 0.85rem;
  padding: 0.4rem 1rem;
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: transparent;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.page-about .feature-card .btn-outline:hover,
.page-about .feature-card .btn-outline:focus {
  background: var(--color-accent);
  color: var(--color-white);
}

/* ===== 联系方式引导 ===== */
.page-about .about-cta {
  position: relative;
  margin-top: 3rem;
  padding: 2.5rem 1.5rem;
  background: var(--gradient-header);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  overflow: hidden;
}
.page-about .about-cta__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.75rem;
  max-width: 580px;
  margin: 0 auto;
}
.page-about .cta-heading {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 3.5vw, 1.9rem);
  font-weight: 700;
  color: var(--color-white);
  margin: 0;
  letter-spacing: -0.01em;
}
.page-about .cta-heading::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background: var(--color-accent);
  margin: 0.4rem auto 0;
  border-radius: 2px;
}
.page-about .cta-text {
  font-size: 0.95rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.75);
  margin: 0;
  max-width: 440px;
}
.page-about .cta-contact {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem 1.5rem;
  margin: 0.25rem 0 0.5rem;
}
.page-about .cta-contact__item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.92rem;
  color: var(--color-silver-light);
  font-family: var(--font-mono);
}
.page-about .cta-contact__item svg {
  flex-shrink: 0;
  color: var(--color-accent);
}
.page-about .about-cta .btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
  font-weight: 600;
  padding: 0.6rem 2rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.page-about .about-cta .btn-primary:hover,
.page-about .about-cta .btn-primary:focus {
  background: var(--color-accent-hover);
  transform: scale(1.03);
}

/* CTA 速度线 */
.page-about .cta-speedlines {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  pointer-events: none;
  overflow: hidden;
}
.page-about .cta-speedlines .speedline {
  position: absolute;
  height: 2px;
  background: rgba(255, 107, 53, 0.15);
  border-radius: 1px;
  opacity: 0.3;
  animation: ctaDash 4s ease-in-out infinite alternate;
}
.page-about .cta-speedlines .speedline--l1 {
  width: 240px;
  top: 12%;
  left: -60px;
  transform: rotate(6deg);
  animation-delay: 0s;
}
.page-about .cta-speedlines .speedline--l2 {
  width: 160px;
  top: 48%;
  right: -40px;
  transform: rotate(-8deg);
  animation-delay: 1s;
}
.page-about .cta-speedlines .speedline--l3 {
  width: 300px;
  bottom: 8%;
  left: 20%;
  transform: rotate(2deg);
  animation-delay: 2s;
}
@keyframes ctaDash {
  0% { opacity: 0.1; transform: translateX(0) rotate(6deg); }
  50% { opacity: 0.4; }
  100% { opacity: 0.15; transform: translateX(30px) rotate(6deg); }
}

/* ===== 响应式：桌面端 ===== */
@media (min-width: 768px) {
  .page-about {
    padding: 2rem 2rem 4rem;
  }
  .page-about .about-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 2.5rem;
  }
  .page-about .about-manifesto {
    flex: 0 0 var(--about-manifesto-width);
    max-width: var(--about-manifesto-width);
    padding: 0.5rem 0 1rem;
    position: sticky;
    top: calc(var(--header-height) + 1rem);
  }
  .page-about .manifesto-visual {
    margin: 0 0 1.5rem;
  }
  .page-about .manifesto-badge {
    width: 80px;
    height: 80px;
  }
  .page-about .about-features {
    flex: 1 1 auto;
    min-width: 0;
    padding: 0.25rem 0 0;
  }
  .page-about .feature-card {
    margin-bottom: 1.5rem;
  }
  .page-about .feature-card--stats {
    margin-right: 0;
  }
  .page-about .feature-card--vehicle {
    margin-left: 2rem;
    margin-right: 0.5rem;
  }
  .page-about .feature-card--network {
    margin-left: 3.2rem;
    margin-right: 0.2rem;
  }
  .page-about .feature-card__inner {
    padding: 1.5rem 2rem 1.75rem;
  }
  .page-about .about-cta {
    margin-top: 4rem;
    padding: 3.5rem 2rem;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  }
  .page-about .cta-contact {
    gap: 1.5rem 2.5rem;
  }
}

@media (min-width: 1024px) {
  .page-about {
    padding: 2.5rem 2.5rem 5rem;
  }
  .page-about .about-manifesto {
    --about-manifesto-width: 36%;
  }
  .page-about .features-heading {
    margin-bottom: 2rem;
  }
  .page-about .feature-card--vehicle {
    margin-left: 3rem;
  }
  .page-about .feature-card--network {
    margin-left: 4.5rem;
  }
}

/* ---------- 确保窄屏不横向溢出 ---------- */
@media (max-width: 400px) {
  .page-about {
    padding-left: 0.6rem;
    padding-right: 0.6rem;
  }
  .page-about .feature-card__inner {
    padding: 1rem 1.2rem 1.25rem;
  }
  .page-about .cta-contact {
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
  }
}