/* ===== 品牌档案页面专属样式 .page-about ===== */

/* 页面级设计变量 */
.page-about {
  --page-section-gap: 80px;
  --page-card-radius: 4px;
  --page-border-thick: 4px;
  --page-number-size: 120px;
  --page-transition-speed: 0.4s;
  background-color: var(--bg-dark, #0A0A0A);
  color: var(--text-primary, #FFFFFF);
}

/* ===== 首屏 ===== */
.page-about .hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.page-about .hero-bg-wrapper {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  opacity: 0.35;
  filter: grayscale(0.6) contrast(1.3);
}

.page-about .hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: radial-gradient(ellipse at 30% 50%, rgba(10,10,10,0.4) 0%, rgba(10,10,10,0.85) 80%);
}

.page-about .hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 100px 20px 60px;
  max-width: 900px;
  width: 100%;
}

.page-about .hero-breadcrumb {
  font-family: var(--font-body, 'Noto Sans SC', sans-serif);
  font-size: 14px;
  color: var(--text-secondary, #CCCCCC);
  margin-bottom: 32px;
  letter-spacing: 0.5px;
}

.page-about .hero-breadcrumb a {
  color: var(--text-secondary, #CCCCCC);
  text-decoration: none;
  transition: color 0.25s;
}

.page-about .hero-breadcrumb a:hover,
.page-about .hero-breadcrumb a:focus-visible {
  color: var(--primary, #FF2D2D);
}

.page-about .breadcrumb-sep {
  margin: 0 10px;
  color: var(--metal-silver, #C0C0C0);
}

.page-about .breadcrumb-current {
  color: var(--text-primary, #FFFFFF);
  font-weight: 600;
}

.page-about .hero-title {
  font-family: var(--font-headline, Impact, 'Arial Black', sans-serif);
  font-size: clamp(48px, 12vw, 120px);
  line-height: 1.05;
  letter-spacing: -2px;
  color: var(--text-primary, #FFFFFF);
  margin: 0 0 20px;
  text-transform: uppercase;
  text-shadow: 0 0 60px rgba(255,45,45,0.25);
}

.page-about .hero-vision {
  font-family: var(--font-body, 'Noto Sans SC', sans-serif);
  font-size: clamp(16px, 3vw, 28px);
  line-height: 1.5;
  color: var(--text-secondary, #CCCCCC);
  max-width: 650px;
  margin: 0 auto 50px;
  letter-spacing: 2px;
}

.page-about .hero-scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  animation: hero-pulse 2.4s ease-in-out infinite;
}

@keyframes hero-pulse {
  0%, 100% { opacity: 0.5; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(4px); }
}

.page-about .scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--primary, #FF2D2D), transparent);
}

.page-about .scroll-text {
  font-size: 12px;
  letter-spacing: 4px;
  color: var(--metal-silver, #C0C0C0);
  text-transform: uppercase;
}

/* ===== 章节通用 ===== */
.page-about .section-marker {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.page-about .marker-number {
  font-family: var(--font-headline, Impact, 'Arial Black', sans-serif);
  font-size: var(--page-number-size, 120px);
  line-height: 0.9;
  color: var(--primary, #FF2D2D);
  opacity: 0.25;
  user-select: none;
  transition: opacity 0.6s ease, transform 0.6s ease;
  /* 滚动驱动动画（渐进增强） */
  view-timeline-name: --number-timeline;
  view-timeline-axis: block;
  animation: number-strength linear;
  animation-timeline: --number-timeline;
  animation-range: entry 0% entry 80%;
}

@keyframes number-strength {
  from { opacity: 0.15; transform: scale(0.95); }
  to { opacity: 0.40; transform: scale(1.05); }
}

@supports not (view-timeline-name: none) {
  .page-about .marker-number {
    opacity: 0.30;
  }
}

.page-about .marker-line {
  flex: 1;
  height: 2px;
  background: linear-gradient(to right, var(--border-strong, #333), transparent);
  max-width: 200px;
}

.page-about .section-inner {
  max-width: var(--container-max, 1200px);
  margin: 0 auto;
  padding: 0 20px;
}

.page-about .section-tag {
  display: inline-block;
  font-family: var(--font-body, 'Noto Sans SC', sans-serif);
  font-size: 13px;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--primary, #FF2D2D);
  border: 1px solid var(--primary, #FF2D2D);
  padding: 4px 14px;
  margin-bottom: 16px;
}

.page-about .section-title {
  font-family: var(--font-headline, Impact, 'Arial Black', sans-serif);
  font-size: clamp(28px, 5vw, 48px);
  line-height: 1.15;
  color: var(--text-primary, #FFFFFF);
  margin: 0 0 12px;
  position: relative;
}

.page-about .section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--primary, #FF2D2D);
  margin-top: 12px;
}

.page-about .section-lead {
  font-family: var(--font-body, 'Noto Sans SC', sans-serif);
  font-size: clamp(16px, 2vw, 22px);
  line-height: 1.5;
  color: var(--text-secondary, #CCCCCC);
  margin: 0 0 40px;
  max-width: 640px;
}

.page-about .section-lead.accent {
  font-family: var(--font-headline, Impact, 'Arial Black', sans-serif);
  font-size: clamp(22px, 3.5vw, 36px);
  color: var(--text-primary, #FFFFFF);
  letter-spacing: 4px;
}

.page-about .section-desc {
  font-family: var(--font-body, 'Noto Sans SC', sans-serif);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary, #CCCCCC);
  margin: -20px 0 40px;
  max-width: 600px;
}

/* ===== 01 品牌故事 ===== */
.page-about .story-section {
  padding: var(--page-section-gap, 80px) 0;
  background-color: var(--surface-dark, #1A1A1A);
  border-top: var(--page-border-thick, 4px) solid var(--border-strong, #333);
  border-bottom: var(--page-border-thick, 4px) solid var(--border-strong, #333);
}

.page-about .story-layout {
  display: flex;
  flex-direction: column;
  gap: 32px;
  align-items: flex-start;
}

.page-about .story-text {
  flex: 1;
  max-width: 680px;
}

.page-about .story-text p {
  font-size: 16px;
  line-height: 1.8;
  margin: 0 0 20px;
  color: var(--text-secondary, #CCCCCC);
}

.page-about .story-text p:first-of-type {
  font-size: 18px;
  color: var(--text-primary, #FFFFFF);
  font-weight: 500;
}

.page-about .story-image-wrapper {
  flex-shrink: 0;
  width: 100%;
  max-width: 300px;
  border: var(--page-border-thick, 4px) solid var(--border-strong, #333);
  box-shadow: 8px 8px 0 rgba(255,45,45,0.15);
  transition: box-shadow 0.35s ease;
}

.page-about .story-image-wrapper:hover {
  box-shadow: 12px 12px 0 rgba(255,45,45,0.25);
}

.page-about .story-img {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== 02 设计理念 ===== */
.page-about .philosophy-section {
  padding: var(--page-section-gap, 80px) 0;
  background-color: var(--bg-dark, #0A0A0A);
  border-bottom: var(--page-border-thick, 4px) solid var(--border-strong, #333);
}

.page-about .philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 50px;
}

/* 翻转卡片 */
.page-about .philosophy-card {
  position: relative;
  min-height: 200px;
  perspective: 1200px;
  cursor: default;
}

.page-about .card-front,
.page-about .card-back {
  padding: 28px 24px;
  border: var(--page-border-thick, 4px) solid var(--border-strong, #333);
  background-color: var(--surface-dark, #1A1A1A);
  backface-visibility: hidden;
  transition: transform var(--page-transition-speed, 0.4s) ease, border-color 0.3s ease;
  border-radius: var(--page-card-radius, 4px);
}

.page-about .card-front {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .card-back {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: rotateY(180deg);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary, #CCCCCC);
  padding: 28px 24px;
}

.page-about .philosophy-card:hover .card-front,
.page-about .philosophy-card:focus-within .card-front {
  transform: rotateY(-180deg);
  border-color: var(--primary, #FF2D2D);
}

.page-about .philosophy-card:hover .card-back,
.page-about .philosophy-card:focus-within .card-back {
  transform: rotateY(0deg);
  border-color: var(--primary, #FF2D2D);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .card-front,
  .page-about .card-back {
    transition: none;
  }
  .page-about .philosophy-card:hover .card-front,
  .page-about .philosophy-card:focus-within .card-front {
    transform: none;
  }
  .page-about .philosophy-card:hover .card-back,
  .page-about .philosophy-card:focus-within .card-back {
    transform: none;
  }
  .page-about .card-back {
    position: static;
    transform: none;
    backface-visibility: visible;
    border-top: 0;
  }
  .page-about .philosophy-card {
    min-height: auto;
  }
}

.page-about .card-icon {
  font-size: 32px;
  line-height: 1;
  color: var(--primary, #FF2D2D);
}

.page-about .card-title {
  font-family: var(--font-headline, Impact, 'Arial Black', sans-serif);
  font-size: 22px;
  margin: 0;
  color: var(--text-primary, #FFFFFF);
}

.page-about .card-brief {
  font-size: 14px;
  color: var(--text-secondary, #CCCCCC);
  margin: 0;
}

/* 图解区域 */
.page-about .philosophy-diagram {
  margin-top: 20px;
  border: var(--page-border-thick, 4px) solid var(--border-strong, #333);
  padding: 20px;
  background-color: var(--surface-dark, #1A1A1A);
  border-radius: var(--page-card-radius, 4px);
}

.page-about .diagram-caption {
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--metal-silver, #C0C0C0);
  margin-bottom: 16px;
  text-align: center;
}

.page-about .diagram-img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--border-strong, #333);
}

/* ===== 03 核心功能概述 ===== */
.page-about .features-section {
  padding: var(--page-section-gap, 80px) 0;
  background-color: var(--surface-dark, #1A1A1A);
  border-bottom: var(--page-border-thick, 4px) solid var(--border-strong, #333);
}

.page-about .features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .feature-card {
  background-color: var(--bg-dark, #0A0A0A);
  border: var(--page-border-thick, 4px) solid var(--border-strong, #333);
  padding: 28px 24px;
  border-radius: var(--page-card-radius, 4px);
  display: flex;
  flex-direction: column;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .feature-card:hover,
.page-about .feature-card:focus-within {
  border-color: var(--primary, #FF2D2D);
  box-shadow: 0 0 0 2px rgba(255,45,45,0.1);
}

.page-about .feature-icon {
  font-size: 36px;
  line-height: 1;
  margin-bottom: 16px;
  color: var(--primary, #FF2D2D);
}

.page-about .feature-title {
  font-family: var(--font-headline, Impact, 'Arial Black', sans-serif);
  font-size: 22px;
  margin: 0 0 12px;
  color: var(--text-primary, #FFFFFF);
}

.page-about .feature-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary, #CCCCCC);
  margin: 0 0 20px;
  flex: 1;
}

.page-about .feature-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-body, 'Noto Sans SC', sans-serif);
  font-size: 14px;
  font-weight: 600;
  color: var(--primary, #FF2D2D);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
  align-self: flex-start;
  transition: border-color 0.25s ease, gap 0.25s ease;
}

.page-about .feature-link:hover,
.page-about .feature-link:focus-visible {
  border-bottom-color: var(--primary, #FF2D2D);
  gap: 10px;
}

/* ===== 底部品牌形象 ===== */
.page-about .brand-footer-section {
  padding: 60px 20px 80px;
  background-color: var(--bg-dark, #0A0A0A);
}

.page-about .brand-footer-inner {
  max-width: var(--container-max, 1200px);
  margin: 0 auto;
  text-align: center;
}

.page-about .brand-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.page-about .visual-shape {
  width: 60px;
  height: 60px;
  border: 3px solid var(--border-strong, #333);
  transform: rotate(45deg);
  transition: all 0.35s ease;
}

.page-about .visual-shape.shape-1 {
  background: var(--primary, #FF2D2D);
  border-color: var(--primary, #FF2D2D);
  opacity: 0.3;
}

.page-about .visual-shape.shape-2 {
  width: 80px;
  height: 80px;
  border-color: var(--metal-silver, #C0C0C0);
  background: transparent;
}

.page-about .visual-shape.shape-3 {
  width: 50px;
  height: 50px;
  border-color: var(--primary, #FF2D2D);
  background: transparent;
}

.page-about .visual-shape.shape-4 {
  width: 70px;
  height: 70px;
  border-color: var(--metal-silver, #C0C0C0);
  background: var(--surface-dark, #1A1A1A);
  opacity: 0.6;
}

.page-about .brand-visual:hover .visual-shape {
  transform: rotate(135deg);
}

.page-about .brand-motto {
  font-family: var(--font-headline, Impact, 'Arial Black', sans-serif);
  font-size: clamp(18px, 3vw, 28px);
  color: var(--text-primary, #FFFFFF);
  letter-spacing: 2px;
  margin: 0 0 20px;
}

.page-about .brand-trust {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary, #CCCCCC);
  max-width: 560px;
  margin: 0 auto 30px;
}

.page-about .brand-extras {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page-about .brand-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
}

.page-about .brand-link {
  font-family: var(--font-body, 'Noto Sans SC', sans-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary, #CCCCCC);
  text-decoration: none;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.page-about .brand-link:hover,
.page-about .brand-link:focus-visible {
  color: var(--text-primary, #FFFFFF);
  border-bottom-color: var(--primary, #FF2D2D);
}

.page-about .brand-link-primary {
  color: var(--primary, #FF2D2D);
  border-bottom-color: var(--primary, #FF2D2D);
}

.page-about .brand-link-primary:hover,
.page-about .brand-link-primary:focus-visible {
  color: var(--text-primary, #FFFFFF);
  border-bottom-color: var(--text-primary, #FFFFFF);
}

/* ===== 响应式 ===== */

/* 窄屏（默认移动端优先） */
@media (max-width: 767px) {
  .page-about {
    --page-number-size: 80px;
    --page-section-gap: 50px;
  }

  .page-about .hero-title {
    letter-spacing: -1px;
  }

  .page-about .hero-breadcrumb {
    font-size: 12px;
  }

  .page-about .section-title::after {
    width: 40px;
  }

  .page-about .story-image-wrapper {
    max-width: 200px;
  }

  .page-about .card-front,
  .page-about .card-back {
    padding: 20px 18px;
  }

  .page-about .card-back {
    font-size: 14px;
  }

  .page-about .feature-card {
    padding: 22px 18px;
  }

  .page-about .brand-links {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }

  .page-about .visual-shape {
    width: 40px;
    height: 40px;
  }

  .page-about .visual-shape.shape-2 {
    width: 56px;
    height: 56px;
  }

  .page-about .visual-shape.shape-4 {
    width: 48px;
    height: 48px;
  }

  .page-about .philosophy-diagram {
    padding: 12px;
  }
}

/* 桌面 */
@media (min-width: 768px) {
  .page-about .story-layout {
    flex-direction: row;
    align-items: center;
    gap: 50px;
  }

  .page-about .story-image-wrapper {
    max-width: 260px;
  }

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

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

  .page-about .section-marker {
    max-width: var(--container-max, 1200px);
    margin: 0 auto 20px;
    padding: 0 20px;
  }

  .page-about .philosophy-diagram {
    display: flex;
    align-items: flex-start;
    gap: 30px;
    padding: 24px 30px;
  }

  .page-about .diagram-caption {
    writing-mode: vertical-lr;
    text-orientation: mixed;
    margin-bottom: 0;
    margin-right: 16px;
    font-size: 12px;
    letter-spacing: 3px;
  }

  .page-about .diagram-img {
    max-width: 520px;
  }

  .page-about .brand-links {
    gap: 36px;
  }

  .page-about .brand-footer-section {
    padding: 80px 20px 100px;
  }
}

/* 大屏微调 */
@media (min-width: 1200px) {
  .page-about .hero-content {
    padding: 120px 40px 80px;
  }

  .page-about .story-section,
  .page-about .philosophy-section,
  .page-about .features-section {
    padding: 100px 0;
  }

  .page-about .story-image-wrapper {
    max-width: 300px;
  }

  .page-about .philosophy-grid {
    gap: 30px;
  }

  .page-about .features-grid {
    gap: 30px;
  }
}

/* ===== 减少动画偏好 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-about .hero-scroll-hint {
    animation: none;
    opacity: 0.6;
  }

  .page-about .marker-number {
    animation: none;
    opacity: 0.30;
  }

  .page-about .brand-visual .visual-shape {
    transition: none;
  }

  .page-about .brand-visual:hover .visual-shape {
    transform: rotate(45deg);
  }
}