/* ========================================
   宠王子·PetKing 关于我们页面样式
   主色调：#E7161A（红） / #CC853C（金）
   ======================================== */

.about-page {
  --ap-primary: #E7161A;
  --ap-primary-dark: #B51B16;
  --ap-primary-900: #7C110D;
  --ap-secondary: #CC853C;
  --ap-secondary-light: #E8A96A;
  --ap-ink: #241C16;
  --ap-ink-2: #4A4038;
  --ap-muted: #8A8075;
  --ap-cream: #FBF7F1;
  --ap-cream-2: #F5EFE6;
  --ap-surface: #FFFFFF;
  --ap-border: #EBE4DA;
  --ap-shadow: 0 24px 60px rgba(36, 28, 22, 0.10);
  --ap-shadow-sm: 0 4px 16px rgba(36, 28, 22, 0.06);
  --ap-radius: 22px;
  --ap-ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---- Header overrides for subpage (red header, white text) ---- */
.about-page .site-header {
  background: var(--ap-primary);
  border-bottom-color: rgba(255, 255, 255, 0.18);
}

.about-page .brand,
.about-page .brand-name {
  color: #fff;
}

.about-page .brand-logo {
  filter: brightness(0) invert(1);
}

.about-page .nav-link,
.about-page .lang-switch {
  color: rgba(255, 255, 255, 0.92);
}

.about-page .nav-link:hover,
.about-page .nav-link:focus,
.about-page .nav-link.active,
.about-page .lang-switch:hover,
.about-page .lang-switch:focus {
  color: #fff;
  background: rgba(255, 255, 255, 0.16);
}

.about-page .hamburger-bar {
  background: #fff;
}

.about-page .nav-toggle:hover,
.about-page .nav-toggle:focus {
  background: rgba(255, 255, 255, 0.16);
}

/* 移动端菜单展开后恢复深色文字 */
.about-page .site-header .nav-menu.open .nav-link,
.about-page .site-header .nav-menu.open .lang-switch {
  color: var(--text-secondary);
}

.about-page .site-header .nav-menu.open .nav-link:hover,
.about-page .site-header .nav-menu.open .nav-link:focus,
.about-page .site-header .nav-menu.open .nav-link.active,
.about-page .site-header .nav-menu.open .lang-switch:hover,
.about-page .site-header .nav-menu.open .lang-switch:focus {
  color: var(--ap-primary);
  background: var(--ap-cream);
}

.about-page .site-header .nav-toggle[aria-expanded="true"] .hamburger-bar {
  background: var(--text);
}

/* ---- Hero ---- */
.about-hero {
  position: relative;
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: #fff;
  overflow: hidden;
  padding-top: var(--header-height-mobile);
}

.about-hero-bg {
  position: absolute;
  inset: 0;
  background-image: url("../images/about-hero.webp");
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.about-hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(124, 17, 13, 0.55) 0%, rgba(124, 17, 13, 0.42) 40%, rgba(36, 28, 22, 0.72) 100%);
  z-index: 1;
}

.about-hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: var(--space-12) var(--space-5) var(--space-8);
}

.about-hero-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--ap-secondary-light);
  margin-bottom: var(--space-4);
}

.about-hero-title {
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-4);
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
}

.about-hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.6rem);
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--ap-secondary-light);
  margin-bottom: var(--space-4);
}

.about-hero-desc {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.88);
  max-width: 52ch;
  margin: 0 auto;
  line-height: 1.8;
}

/* ---- Sticky anchor nav ---- */
.about-anchor-nav {
  position: sticky;
  top: var(--header-height-mobile);
  z-index: 100;
  width: 100%;
  background: #fff;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--ap-border);
  box-shadow: var(--ap-shadow-sm);
}

.about-anchor-inner {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  max-width: 1280px;
  margin: 0 auto;
  overflow-x: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.about-anchor-inner::-webkit-scrollbar {
  display: none;
}

.about-anchor-link {
  flex-shrink: 0;
  padding: var(--space-2) var(--space-4);
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ap-ink-2);
  background: transparent;
  transition: color 0.2s, background 0.2s;
}

.about-anchor-link:hover,
.about-anchor-link:focus {
  color: var(--ap-primary);
  background: var(--ap-cream-2);
}

/* ---- Sections ---- */
.about-section {
  position: relative;
  padding: var(--space-16) var(--space-5);
  background: var(--ap-surface);
  scroll-margin-top: calc(var(--header-height-mobile) + 64px);
}

.about-section-alt {
  background: var(--ap-cream);
}

.about-section-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.about-section-header {
  margin-bottom: var(--space-10);
}

.about-section-header.center {
  text-align: center;
}

.about-section-header.center .about-section-subtitle {
  margin-left: auto;
  margin-right: auto;
}

.about-section-eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--ap-secondary);
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.about-section-title {
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--ap-primary);
  margin-bottom: var(--space-4);
}

.about-section-subtitle {
  font-size: 1.05rem;
  color: var(--ap-muted);
  max-width: 56ch;
  line-height: 1.7;
}

/* ---- Two-column text + image ---- */
.about-two-col {
  display: grid;
  gap: var(--space-8);
  align-items: center;
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.about-text p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--ap-ink-2);
}

.about-text strong {
  color: var(--ap-ink);
  font-weight: 700;
}

.about-lead {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ap-ink);
  line-height: 1.7;
}

.about-media {
  margin: 0;
  border-radius: var(--ap-radius);
  overflow: hidden;
  box-shadow: var(--ap-shadow);
  background: var(--ap-cream-2);
}

.about-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}

/* ---- Product cards ---- */
.about-product-grid {
  display: grid;
  gap: var(--space-6);
}

.about-product-card {
  background: var(--ap-surface);
  border-radius: var(--ap-radius);
  overflow: hidden;
  box-shadow: var(--ap-shadow-sm);
  border: 1px solid var(--ap-border);
  transition: transform 0.3s var(--ap-ease), box-shadow 0.3s;
}

.about-product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--ap-shadow);
}

.about-product-visual {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--ap-cream-2);
}

.about-product-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ap-ease);
}

.about-product-card:hover .about-product-visual img {
  transform: scale(1.05);
}

.about-product-body {
  padding: var(--space-6);
}

.about-product-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--ap-ink);
  margin-bottom: var(--space-3);
}

.about-product-desc {
  font-size: 0.94rem;
  color: var(--ap-ink-2);
  line-height: 1.7;
}

/* ---- Business model ---- */
.about-model-block {
  background: var(--ap-surface);
  border-radius: var(--ap-radius);
  padding: var(--space-8) var(--space-6);
  box-shadow: var(--ap-shadow-sm);
  border: 1px solid var(--ap-border);
  margin-bottom: var(--space-8);
}

.about-model-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--ap-ink);
  text-align: center;
  margin-bottom: var(--space-8);
}

.about-model-desc {
  max-width: 80ch;
  margin: var(--space-8) auto 0;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--ap-ink-2);
  text-align: center;
}

.s2b2c-flow {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-4);
}

.s2b2c-node {
  flex: 1 1 180px;
  max-width: 240px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-6) var(--space-5);
  border-radius: var(--radius-lg);
  text-align: center;
  color: #fff;
  position: relative;
}

.s2b2c-source {
  background: linear-gradient(135deg, var(--ap-primary) 0%, var(--ap-primary-dark) 100%);
}

.s2b2c-business {
  background: linear-gradient(135deg, var(--ap-secondary) 0%, #A6682E 100%);
}

.s2b2c-consumer {
  background: linear-gradient(135deg, #0abab5 0%, #7dd8cf 100%);
}

.s2b2c-label {
  font-size: 1.1rem;
  font-weight: 800;
}

.s2b2c-note {
  font-size: 0.85rem;
  opacity: 0.9;
}

.s2b2c-arrow {
  width: 32px;
  height: 2px;
  background: var(--ap-secondary);
  position: relative;
  flex-shrink: 0;
}

.s2b2c-arrow::after {
  content: "";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 8px solid var(--ap-secondary);
}

/* 移动端：S2B2C 链路改为纵向堆叠，箭头转为朝下 */
@media (max-width: 980px) {
  .s2b2c-flow {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: var(--space-3);
  }

  .s2b2c-node {
    flex: 0 0 auto;
    width: 100%;
    max-width: 360px;
    padding: var(--space-5) var(--space-4);
  }

  .s2b2c-label {
    font-size: 1.05rem;
  }

  .s2b2c-note {
    font-size: 0.8rem;
  }

  .s2b2c-arrow {
    width: 2px;
    height: 26px;
  }

  .s2b2c-arrow::after {
    right: auto;
    top: auto;
    left: 50%;
    bottom: -1px;
    transform: translateX(-50%);
    border-top: 8px solid var(--ap-secondary);
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-bottom: 0;
  }
}

/* ---- Value cards ---- */
.about-value-grid {
  display: grid;
  gap: var(--space-6);
  margin-bottom: var(--space-10);
}

.about-value-card {
  background: var(--ap-surface);
  border-radius: var(--ap-radius);
  padding: var(--space-6);
  border-left: 4px solid var(--ap-primary);
  box-shadow: var(--ap-shadow-sm);
}

.about-value-card h4 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--ap-ink);
  margin-bottom: var(--space-3);
}

.about-value-card p {
  font-size: 0.95rem;
  color: var(--ap-ink-2);
  line-height: 1.75;
}

/* ---- Timeline (发展规划 · 品牌化路线图) ---- */
.about-timeline {
  background: var(--ap-surface);
  border-radius: var(--ap-radius);
  padding: var(--space-8) var(--space-6) var(--space-10);
  box-shadow: var(--ap-shadow-sm);
  border: 1px solid var(--ap-border);
}

.about-timeline-track {
  position: relative;
}

/* 移动端：左侧竖向主轴 */
.about-timeline-rail {
  position: absolute;
  left: 31px;
  top: 24px;
  bottom: 24px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--ap-primary) 0%, var(--ap-secondary) 50%, var(--ap-primary-900) 100%);
  opacity: 0.45;
}

.about-timeline-list {
  display: grid;
  gap: var(--space-6);
  position: relative;
}

.about-timeline-item {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: var(--space-4);
  align-items: start;
}

.about-timeline-node {
  justify-self: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--ap-primary) 0%, var(--ap-primary-dark) 100%);
  color: #fff;
  font-weight: 800;
  font-size: 1rem;
  box-shadow: 0 8px 20px rgba(183, 27, 22, 0.28);
  border: 3px solid #fff;
  position: relative;
  z-index: 1;
  transition: transform 0.3s var(--ap-ease);
}

.about-timeline-item:hover .about-timeline-node {
  transform: scale(1.08);
}

.about-timeline-item--2 .about-timeline-node {
  background: linear-gradient(135deg, var(--ap-secondary) 0%, #A6682E 100%);
  box-shadow: 0 8px 20px rgba(204, 133, 60, 0.28);
}

.about-timeline-item--3 .about-timeline-node {
  background: linear-gradient(135deg, var(--ap-primary-900) 0%, #2c1a12 100%);
  box-shadow: 0 8px 20px rgba(36, 28, 22, 0.28);
}

.about-timeline-index {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.about-timeline-card {
  background: var(--ap-cream);
  border: 1px solid var(--ap-border);
  border-radius: var(--ap-radius);
  padding: var(--space-5) var(--space-6);
  box-shadow: var(--ap-shadow-sm);
  transition: transform 0.3s var(--ap-ease), box-shadow 0.3s;
}

.about-timeline-item:hover .about-timeline-card {
  transform: translateY(-4px);
  box-shadow: var(--ap-shadow);
}

.about-timeline-phase {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-1) var(--space-4);
  border-radius: 999px;
  background: var(--ap-primary);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-3);
}

.about-timeline-item--2 .about-timeline-phase {
  background: var(--ap-secondary);
}

.about-timeline-item--3 .about-timeline-phase {
  background: var(--ap-primary-900);
}

.about-timeline-content h4 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--ap-ink);
  margin-bottom: var(--space-2);
}

.about-timeline-content p {
  font-size: 0.95rem;
  color: var(--ap-ink-2);
  line-height: 1.75;
}

/* ---- Advantages (我们的优势 · 大图卡片) ---- */
/* 整段柔和品牌背景：顶部红/金微光 + 米色底，制造纵深，避免白底白卡发飘 */
#advantages {
  background:
    radial-gradient(1100px 480px at 50% -8%, rgba(231, 22, 26, 0.07), rgba(231, 22, 26, 0) 62%),
    radial-gradient(900px 420px at 100% 0%, rgba(204, 133, 60, 0.06), rgba(204, 133, 60, 0) 60%),
    linear-gradient(180deg, #ffffff 0%, var(--ap-cream) 100%);
}

.about-advantages-grid {
  display: grid;
  gap: clamp(1.25rem, 1.8vw, 1.75rem);
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.about-advantage-card {
  position: relative;
  background: var(--ap-surface);
  border-radius: var(--ap-radius);
  border: 1px solid var(--ap-border);
  box-shadow: 0 8px 24px rgba(36, 28, 22, 0.07);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  isolation: isolate;
  transition: transform 0.45s var(--ap-ease), box-shadow 0.45s var(--ap-ease),
    border-color 0.45s var(--ap-ease);
}

/* 顶部品牌渐变描边：常驻细线 */
.about-advantage-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--ap-primary) 0%, var(--ap-secondary) 100%);
  z-index: 3;
  pointer-events: none;
}

/* 序号胶囊徽标：浮在大图左上角，白底 + 金色数字，清晰克制 */
.about-advantage-index {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  height: 28px;
  padding: 0 12px;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--ap-secondary);
  background: rgba(255, 255, 255, 0.94);
  border-radius: 999px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.18);
  font-variant-numeric: tabular-nums;
}

.about-advantage-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(36, 28, 22, 0.14);
  border-color: var(--ap-secondary-light);
}

/* 大图封面：固定 16:11 比例 + object-fit 填满，背景色作为加载占位 */
.about-advantage-cover {
  position: relative;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 16 / 11;
  background: linear-gradient(135deg, #2a0a0a 0%, #5a0e0e 100%);
}

.about-advantage-cover img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ap-ease);
}

.about-advantage-card:hover .about-advantage-cover img {
  transform: scale(1.06);
}

.about-advantage-title {
  font-size: 1.16rem;
  font-weight: 800;
  color: var(--ap-ink);
  margin: clamp(1.3rem, 1.8vw, 1.7rem) clamp(1.4rem, 1.8vw, 1.7rem) var(--space-3);
  padding-bottom: var(--space-3);
  position: relative;
  letter-spacing: 0.01em;
}

/* 标题下方的金红短分隔线，hover 时延展 */
.about-advantage-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 38px;
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--ap-primary), var(--ap-secondary));
  transition: width 0.4s var(--ap-ease);
}

.about-advantage-card:hover .about-advantage-title::after {
  width: 64px;
}

.about-advantage-desc {
  font-size: 0.95rem;
  color: var(--ap-ink-2);
  line-height: 1.78;
  padding: 0 clamp(1.4rem, 1.8vw, 1.7rem) clamp(1.5rem, 2vw, 1.9rem);
}

/* ---- Footer 样式已统一收敛至 style.css（全站共用，与首页一致） ---- */

/* ---- 移动端：锚点选项卡不横向滚动，自动换行居中铺满，保证一屏可见 ---- */
@media (max-width: 980px) {
  .about-anchor-inner {
    flex-wrap: wrap;
    justify-content: center;
    overflow-x: visible;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
  }

  .about-anchor-link {
    flex: 0 1 auto;
    white-space: nowrap;
    font-size: 0.82rem;
    padding: 0.4rem 0.85rem;
  }

  /* 换行后 sticky 导航变高（约两行），补偿锚点定位偏移，避免标题被遮挡 */
  .about-section {
    scroll-margin-top: calc(var(--header-height-mobile) + 116px);
  }
}

/* ---- Responsive: tablet ---- */
@media (min-width: 980px) {
  .about-hero {
    min-height: 55vh;
    padding-top: var(--header-height);
  }

  .about-anchor-nav {
    top: var(--header-height);
  }

  .about-anchor-inner {
    justify-content: center;
    padding: var(--space-4) var(--space-8);
  }

  .about-section {
    padding: var(--space-20) var(--space-8);
    scroll-margin-top: calc(var(--header-height) + 64px);
  }

  .about-two-col {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
  }

  .about-two-col-reversed .about-media {
    order: -1;
  }

  .about-product-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-value-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* 优势卡：平板 2 列，让大图更舒展（手机单列由默认 auto-fit 提供） */
  .about-advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ---- Responsive: desktop ---- */
@media (min-width: 1024px) {
  .about-section {
    padding: var(--space-24) var(--space-12);
  }

  .about-product-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  /* 5 大核心优势：桌面端等宽五列一行铺开，干净利落 */
  .about-advantages-grid {
    grid-template-columns: repeat(5, 1fr);
  }

  .about-timeline-rail {
    left: 16.66%;
    right: 16.66%;
    top: 24px;
    bottom: auto;
    width: auto;
    height: 3px;
    background: linear-gradient(90deg, var(--ap-primary) 0%, var(--ap-secondary) 50%, var(--ap-primary-900) 100%);
  }

  .about-timeline-list {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
  }

  .about-timeline-item {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
    gap: var(--space-5);
  }

  .about-timeline-card {
    width: 100%;
  }

  .about-timeline-phase {
    margin: 0 auto var(--space-3);
  }
}

/* ---- Responsive: large desktop ---- */
@media (min-width: 1280px) {
  .about-section-inner {
    max-width: 1360px;
  }

  .about-two-col {
    gap: var(--space-20);
  }
}

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  .about-product-card,
  .about-advantage-card {
    transition: none;
  }
}