.page-about {
  --about-hero-bg: #FF4500;
  --about-hero-text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
  --about-card-bg: #1A1A1A;
  --about-card-border: #333333;
  --about-card-hover-border: #FF4500;
  --about-manifesto-bg: #0D0D0D;
  --about-icon-gold: #FFD700;
  --about-icon-blue: #00BFFF;
  --about-icon-orange: #FF4500;
  --icon-size: 32px;
  display: block;
  width: 100%;
  max-width: 100%;
  margin: 0;
  padding: 0;
  background: var(--color-bg-dark, #0D0D0D);
  color: var(--color-text-primary, #FFFFFF);
  font-family: var(--font-body, 'Helvetica Neue', Arial, sans-serif);
}

/* 面包屑 */
.about-breadcrumb {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: var(--spacing-md, 1rem) var(--spacing-lg, 2rem) 0;
  font-size: var(--scale-small, 0.875rem);
  color: var(--color-text-secondary, #B0B0B0);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm, 0.5rem);
  flex-wrap: wrap;
}
.about-breadcrumb a {
  color: var(--color-secondary, #00BFFF);
  text-decoration: none;
  transition: color var(--transition-fast, 0.15s ease);
}
.about-breadcrumb a:hover {
  color: var(--color-primary, #FF4500);
  text-decoration: underline;
}
.about-breadcrumb .sep {
  color: var(--color-border, #333333);
  user-select: none;
}
.about-breadcrumb [aria-current="page"] {
  color: var(--color-text-primary, #FFFFFF);
  font-weight: var(--weight-heading, 900);
}

/* 品牌定位 —— 全宽火焰橙背景 */
.about-hero {
  background: var(--about-hero-bg);
  position: relative;
  overflow: hidden;
  margin: 0;
  padding: 0;
}
.about-hero-inner {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: var(--spacing-2xl, 4rem) var(--spacing-lg, 2rem);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl, 3rem);
  position: relative;
  z-index: 2;
}
.about-hero-text {
  flex: 0 0 auto;
  max-width: 100%;
  text-shadow: var(--about-hero-text-shadow);
}
.about-hero-label {
  display: inline-block;
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: var(--scale-small, 0.875rem);
  letter-spacing: 0.15em;
  color: var(--color-accent, #FFD700);
  border: 2px solid var(--color-accent, #FFD700);
  padding: var(--spacing-xs, 0.25rem) var(--spacing-md, 1rem);
  margin-bottom: var(--spacing-md, 1rem);
  text-transform: uppercase;
}
.about-hero-text h1 {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: var(--scale-h1, 2.2rem);
  font-weight: var(--weight-heading, 900);
  color: var(--color-text-primary, #FFFFFF);
  margin: 0 0 var(--spacing-sm, 0.5rem);
  text-transform: uppercase;
  line-height: 1.05;
  letter-spacing: 0.02em;
}
.about-hero-tagline {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: var(--scale-h3, 1.25rem);
  font-weight: var(--weight-heading, 900);
  color: var(--color-accent, #FFD700);
  margin: 0 0 var(--spacing-md, 1rem);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.about-hero-desc {
  font-size: var(--scale-body, 1rem);
  line-height: 1.7;
  color: var(--color-text-primary, #FFFFFF);
  max-width: 560px;
  margin: 0 0 var(--spacing-lg, 1.2rem);
}
.about-hero-action {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md, 1rem);
  align-items: center;
}
.about-hero-action .btn {
  font-size: var(--scale-body, 1rem);
  padding: var(--spacing-sm, 0.5rem) var(--spacing-lg, 1.2rem);
  text-decoration: none;
  text-transform: uppercase;
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-weight: var(--weight-heading, 900);
  transition: transform var(--transition-fast, 0.15s ease), box-shadow var(--transition-fast, 0.15s ease);
}
.about-hero-action .btn:hover {
  transform: scale(1.04);
  box-shadow: var(--shadow-glow, 0 0 20px rgba(255,69,0,0.3));
}
.about-hero-action .btn-primary {
  background: var(--color-text-primary, #FFFFFF);
  color: var(--about-hero-bg);
  border: 2px solid var(--color-text-primary, #FFFFFF);
}
.about-hero-action .btn-outline {
  background: transparent;
  color: var(--color-text-primary, #FFFFFF);
  border: 2px solid var(--color-text-primary, #FFFFFF);
}
.about-hero-visual {
  flex: 0 0 auto;
  position: relative;
  width: 100%;
  max-width: 540px;
  margin: 0 auto;
}
.about-hero-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--border-width-thick, 4px) solid var(--color-accent, #FFD700);
  box-shadow: var(--shadow-heavy, 0 8px 32px rgba(0,0,0,0.6));
  transform: rotate(-1deg);
  transition: transform var(--transition-base, 0.25s ease);
}
.about-hero-img:hover {
  transform: rotate(0deg) scale(1.01);
}

/* 章节分隔线 */
.about-section-divider {
  width: 100%;
  height: var(--border-width-thick, 4px);
  background: var(--color-primary, #FF4500);
  opacity: 0.6;
  margin: 0;
}

/* 核心功能 —— 深色背景，左标题右内容 */
.about-features {
  background: var(--color-bg-dark, #0D0D0D);
  padding: var(--spacing-2xl, 4rem) 0;
}
.about-features-inner {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: 0 var(--spacing-lg, 2rem);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl, 2rem);
}
.about-features-title {
  flex: 0 0 auto;
}
.about-features-title h2 {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: var(--scale-h2, 1.6rem);
  font-weight: var(--weight-heading, 900);
  color: var(--color-primary, #FF4500);
  margin: 0 0 var(--spacing-sm, 0.5rem);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.about-features-sub {
  font-size: var(--scale-body, 1rem);
  color: var(--color-text-secondary, #B0B0B0);
  max-width: 600px;
  line-height: 1.6;
  margin: 0;
}
.about-features-body {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl, 2rem);
}
.about-features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg, 1.2rem);
}
.about-feature-card {
  background: var(--about-card-bg);
  border: 2px solid var(--about-card-border);
  padding: var(--spacing-lg, 1.2rem);
  transition: border-color var(--transition-base, 0.25s ease), transform var(--transition-base, 0.25s ease), box-shadow var(--transition-base, 0.25s ease);
  position: relative;
}
.about-feature-card:hover {
  border-color: var(--about-card-hover-border);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(255, 69, 0, 0.18);
}
.about-feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--icon-size);
  height: var(--icon-size);
  font-size: 1.2rem;
  margin-bottom: var(--spacing-sm, 0.5rem);
  transition: transform var(--transition-base, 0.25s ease);
}
.about-feature-card:hover .about-feature-icon {
  transform: rotate(360deg);
}
.icon-star::before {
  content: "★";
  color: var(--about-icon-gold);
  font-size: 1.4rem;
}
.icon-circle::before {
  content: "●";
  color: var(--about-icon-blue);
  font-size: 1.4rem;
}
.icon-diamond::before {
  content: "◆";
  color: var(--about-icon-orange);
  font-size: 1.4rem;
}
.icon-square::before {
  content: "■";
  color: var(--about-icon-gold);
  font-size: 1.4rem;
}
.about-feature-card h3 {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: var(--scale-h3, 1.25rem);
  font-weight: var(--weight-heading, 900);
  color: var(--color-text-primary, #FFFFFF);
  margin: 0 0 var(--spacing-xs, 0.25rem);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.about-feature-card p {
  font-size: var(--scale-body, 1rem);
  color: var(--color-text-secondary, #B0B0B0);
  line-height: 1.5;
  margin: 0;
}
.about-feature-link {
  color: var(--color-secondary, #00BFFF);
  text-decoration: none;
  font-weight: var(--weight-heading, 900);
  transition: color var(--transition-fast, 0.15s ease);
}
.about-feature-link:hover {
  color: var(--color-primary, #FF4500);
  text-decoration: underline;
}
.about-features-visual {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg, 1.2rem);
  align-items: stretch;
}
.about-features-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--color-border, #333333);
  transition: border-color var(--transition-base, 0.25s ease), transform var(--transition-base, 0.25s ease);
}
.about-features-visual img:hover {
  border-color: var(--color-accent, #FFD700);
  transform: scale(1.01);
}

/* 服务承诺 —— 深色背景，左标题右内容 */
.about-commitment {
  background: var(--color-bg-dark, #0D0D0D);
  padding: var(--spacing-2xl, 4rem) 0;
}
.about-commitment-inner {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: 0 var(--spacing-lg, 2rem);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl, 2rem);
}
.about-commitment-title {
  flex: 0 0 auto;
}
.about-commitment-title h2 {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: var(--scale-h2, 1.6rem);
  font-weight: var(--weight-heading, 900);
  color: var(--color-primary, #FF4500);
  margin: 0 0 var(--spacing-sm, 0.5rem);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.about-commitment-sub {
  font-size: var(--scale-body, 1rem);
  color: var(--color-text-secondary, #B0B0B0);
  max-width: 600px;
  line-height: 1.6;
  margin: 0;
}
.about-commitment-body {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl, 2rem);
}
.about-commitment-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg, 1.2rem);
}
.about-commitment-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs, 0.25rem);
  padding: var(--spacing-lg, 1.2rem);
  background: var(--about-card-bg);
  border-left: var(--border-width-thick, 4px) solid var(--color-primary, #FF4500);
  transition: border-color var(--transition-base, 0.25s ease), background var(--transition-base, 0.25s ease);
}
.about-commitment-item:hover {
  border-left-color: var(--color-accent, #FFD700);
  background: #222;
}
.about-commitment-num {
  font-family: var(--font-numeric, 'Courier New', monospace);
  font-size: var(--scale-h2, 1.6rem);
  font-weight: var(--weight-heading, 900);
  color: var(--color-accent, #FFD700);
  line-height: 1;
  margin-bottom: var(--spacing-xs, 0.25rem);
}
.about-commitment-item h3 {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: var(--scale-h3, 1.25rem);
  font-weight: var(--weight-heading, 900);
  color: var(--color-text-primary, #FFFFFF);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.about-commitment-item p {
  font-size: var(--scale-body, 1rem);
  color: var(--color-text-secondary, #B0B0B0);
  line-height: 1.5;
  margin: 0;
}
.about-commitment-stats {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--spacing-xs, 0.25rem);
  padding: var(--spacing-lg, 1.2rem);
  background: var(--about-card-bg);
  border: 2px solid var(--color-accent, #FFD700);
}
.about-stats-number {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: var(--scale-h2, 1.6rem);
  font-weight: var(--weight-heading, 900);
  color: var(--color-text-primary, #FFFFFF);
  text-transform: uppercase;
}
.about-stats-number .numeric {
  font-family: var(--font-numeric, 'Courier New', monospace);
  color: var(--color-accent, #FFD700);
  font-size: var(--scale-h1, 2.2rem);
}
.about-stats-label {
  font-size: var(--scale-small, 0.875rem);
  color: var(--color-text-secondary, #B0B0B0);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.about-commitment-body .btn {
  align-self: flex-start;
  font-size: var(--scale-body, 1rem);
  padding: var(--spacing-sm, 0.5rem) var(--spacing-lg, 1.2rem);
  text-decoration: none;
  text-transform: uppercase;
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-weight: var(--weight-heading, 900);
  transition: transform var(--transition-fast, 0.15s ease), box-shadow var(--transition-fast, 0.15s ease);
}
.about-commitment-body .btn:hover {
  transform: scale(1.04);
  box-shadow: var(--shadow-glow, 0 0 20px rgba(255,69,0,0.3));
}
.about-commitment-body .btn-outline {
  background: transparent;
  color: var(--color-secondary, #00BFFF);
  border: 2px solid var(--color-secondary, #00BFFF);
}
.about-commitment-body .btn-outline:hover {
  background: var(--color-secondary, #00BFFF);
  color: var(--color-text-on-color, #000000);
}

/* 全宽品牌宣言 —— 渐入效果 */
.about-manifesto {
  background: var(--about-manifesto-bg);
  padding: var(--spacing-2xl, 4rem) var(--spacing-lg, 2rem);
  text-align: center;
  border-top: var(--border-width-thick, 4px) solid var(--color-primary, #FF4500);
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.about-manifesto[data-revealed] {
  opacity: 1;
  transform: translateY(0);
}
.about-manifesto-inner {
  max-width: 720px;
  margin: 0 auto;
}
.about-manifesto-main {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: var(--scale-h1, 2.2rem);
  font-weight: var(--weight-heading, 900);
  color: var(--color-accent, #FFD700);
  text-transform: uppercase;
  margin: 0 0 var(--spacing-md, 1rem);
  letter-spacing: 0.06em;
  line-height: 1.1;
}
.about-manifesto-sub {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: var(--scale-h3, 1.25rem);
  font-weight: var(--weight-heading, 900);
  color: var(--color-text-secondary, #B0B0B0);
  text-transform: uppercase;
  margin: 0 0 var(--spacing-md, 1rem);
  letter-spacing: 0.12em;
}
.about-manifesto-desc {
  font-size: var(--scale-body, 1rem);
  color: var(--color-text-secondary, #B0B0B0);
  max-width: 520px;
  margin: 0 auto var(--spacing-lg, 1.2rem);
  line-height: 1.6;
}
.about-manifesto-cta {
  display: inline-block;
  font-size: var(--scale-body, 1rem);
  padding: var(--spacing-sm, 0.5rem) var(--spacing-lg, 1.2rem);
  text-decoration: none;
  text-transform: uppercase;
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-weight: var(--weight-heading, 900);
  transition: transform var(--transition-fast, 0.15s ease), box-shadow var(--transition-fast, 0.15s ease);
}
.about-manifesto-cta:hover {
  transform: scale(1.04);
  box-shadow: var(--shadow-glow, 0 0 20px rgba(255,69,0,0.3));
}

/* 桌面端布局 (≥768px) */
@media (min-width: 768px) {
  .about-hero-inner {
    flex-direction: row;
    align-items: center;
    padding: var(--spacing-2xl, 4rem) var(--spacing-lg, 2rem);
  }
  .about-hero-text {
    flex: 1 1 50%;
    max-width: 55%;
  }
  .about-hero-text h1 {
    font-size: 3rem;
  }
  .about-hero-tagline {
    font-size: 1.75rem;
  }
  .about-hero-visual {
    flex: 1 1 45%;
    max-width: 45%;
  }
  .about-features-inner {
    flex-direction: row;
    align-items: flex-start;
  }
  .about-features-title {
    flex: 0 0 30%;
    max-width: 30%;
    position: sticky;
    top: 2rem;
  }
  .about-features-body {
    flex: 1 1 70%;
    max-width: 70%;
  }
  .about-features-grid {
    grid-template-columns: 1fr 1fr;
  }
  .about-features-visual {
    flex-direction: row;
    gap: var(--spacing-md, 1rem);
  }
  .about-features-visual img:first-child {
    flex: 2;
  }
  .about-features-visual img:last-child {
    flex: 1;
  }
  .about-commitment-inner {
    flex-direction: row;
    align-items: flex-start;
  }
  .about-commitment-title {
    flex: 0 0 30%;
    max-width: 30%;
    position: sticky;
    top: 2rem;
  }
  .about-commitment-body {
    flex: 1 1 70%;
    max-width: 70%;
  }
  .about-commitment-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg, 1.2rem);
  }
  .about-commitment-stats {
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-lg, 1.2rem);
  }
  .about-manifesto-main {
    font-size: 3rem;
  }
}

@media (min-width: 1024px) {
  .about-hero-text h1 {
    font-size: 4rem;
  }
  .about-hero-tagline {
    font-size: 2rem;
  }
  .about-hero-desc {
    font-size: 1.125rem;
  }
  .about-features-title h2,
  .about-commitment-title h2 {
    font-size: 2.5rem;
  }
  .about-manifesto-main {
    font-size: 4rem;
  }
  .about-stats-number {
    font-size: 2rem;
  }
  .about-stats-number .numeric {
    font-size: 2.8rem;
  }
}

/* 确保所有图片自适应 */
.page-about img {
  max-width: 100%;
  height: auto;
}

/* 按钮通用重置 */
.page-about .btn {
  display: inline-block;
  text-align: center;
  cursor: default;
  border-radius: 0;
  line-height: 1.4;
  letter-spacing: 0.06em;
}
.page-about .btn-primary {
  background: var(--color-primary, #FF4500);
  color: var(--color-text-on-color, #000000);
  border: 2px solid var(--color-primary, #FF4500);
}
.page-about .btn-outline {
  background: transparent;
  color: var(--color-text-primary, #FFFFFF);
  border: 2px solid var(--color-text-primary, #FFFFFF);
}
.page-about .btn-primary:hover,
.page-about .btn-outline:hover {
  cursor: pointer;
}