/* ===== 页面专属 CSS：.page-about ===== */
.page-about {
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  --about-accent-purple: #9B59B6;
  --about-accent-orange: #E67E22;
  --about-deep-start: #0B1E36;
  --about-deep-end: #1A3A5C;
  --about-text-light: #BDC3C7;
  --about-card-bg: rgba(255,255,255,0.05);
  --about-card-border: rgba(255,255,255,0.08);
  --about-section-gap: 4rem;
}

/* 容器统一 */
.page-about .container {
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 1.25rem 0 0.5rem;
  font-size: 0.875rem;
  color: var(--about-text-light);
}
.page-about .breadcrumb a {
  color: var(--about-accent-purple);
  text-decoration: none;
  transition: opacity 0.2s;
}
.page-about .breadcrumb a:hover {
  opacity: 0.75;
}
.page-about .breadcrumb span[aria-current="page"] {
  color: var(--about-accent-orange);
}

/* 首屏区域：章节预览 */
.page-about .about-intro {
  padding: 1.5rem 1.25rem 2.5rem;
  background: linear-gradient(135deg, var(--about-deep-start) 0%, var(--about-deep-end) 100%);
  position: relative;
}
.page-about .about-intro-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
}
.page-about .about-intro-text h1 {
  font-family: var(--font-primary, 'Poppins', sans-serif);
  font-weight: 700;
  font-size: 2.25rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: #fff;
  margin: 0 0 0.75rem;
  line-height: 1.2;
}
.page-about .about-intro-sub {
  font-size: 1.1rem;
  color: var(--about-text-light);
  line-height: 1.6;
  max-width: 680px;
  margin: 0 0 1rem;
}
.page-about .about-intro-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
}
.page-about .meta-item {
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-size: 0.85rem;
  color: var(--about-accent-orange);
  letter-spacing: 0.05em;
  position: relative;
  padding-left: 1rem;
}
.page-about .meta-item::before {
  content: "◆";
  position: absolute;
  left: 0;
  color: var(--about-accent-purple);
  font-size: 0.6rem;
  top: 0.25rem;
}
.page-about .about-intro-graphic {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.page-about .about-logo-graphic {
  max-width: 200px;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 0 12px rgba(155,89,182,0.3));
}
.page-about .about-meteor-svg {
  width: 120px;
  height: 60px;
  flex-shrink: 0;
}

/* brand story */
.page-about .about-story {
  padding: var(--about-section-gap) 0;
  position: relative;
}
.page-about .about-story-inner {
  position: relative;
}
.page-about .about-story-content {
  max-width: 780px;
  margin: 1.5rem 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.page-about .about-story-content p {
  color: var(--about-text-light);
  font-size: 1rem;
  line-height: 1.7;
  margin: 0;
}
.page-about .about-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
  position: relative;
}
.page-about .keyword-card {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  background: var(--about-card-bg);
  border: 1px solid var(--about-card-border);
  border-radius: 2rem;
  font-family: var(--font-primary, 'Poppins', sans-serif);
  font-weight: 600;
  font-size: 0.9rem;
  color: #fff;
  letter-spacing: 0.02em;
  backdrop-filter: blur(4px);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  transform: translateY(calc(var(--kw-offset, 0) * 4px));
}
.page-about .keyword-card:hover {
  transform: translateY(calc(var(--kw-offset, 0) * 2px)) scale(1.04);
  box-shadow: 0 4px 20px rgba(155,89,182,0.25);
  border-color: var(--about-accent-purple);
}

/* 核心能力标签页 */
.page-about .about-capabilities {
  padding: var(--about-section-gap) 0;
  background: linear-gradient(180deg, rgba(11,30,54,0.4) 0%, transparent 100%);
}
.page-about .about-tab-wrapper {
  margin-top: 2rem;
}
.page-about .about-tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  border-bottom: 1px solid var(--about-card-border);
  padding-bottom: 0.75rem;
  margin-bottom: 1.5rem;
}
.page-about .about-tab-btn {
  font-family: var(--font-primary, 'Poppins', sans-serif);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.6rem 1.4rem;
  border: none;
  border-radius: 2rem;
  background: transparent;
  color: var(--about-text-light);
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
}
.page-about .about-tab-btn[aria-selected="true"],
.page-about .about-tab-btn:hover {
  background: var(--about-accent-purple);
  color: #fff;
  box-shadow: 0 2px 12px rgba(155,89,182,0.3);
}
.page-about .about-tab-btn:focus-visible {
  outline: 2px solid var(--about-accent-orange);
  outline-offset: 2px;
}
.page-about .about-tab-panels {
  min-height: 280px;
}
.page-about .about-tab-panel {
  transition: opacity 0.3s ease;
}
.page-about .about-tab-panel[hidden] {
  display: none;
}
.page-about .panel-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: flex-start;
}
.page-about .panel-text h3 {
  font-family: var(--font-primary, 'Poppins', sans-serif);
  font-weight: 700;
  font-size: 1.5rem;
  color: #fff;
  margin: 0 0 0.75rem;
}
.page-about .panel-text p {
  color: var(--about-text-light);
  line-height: 1.6;
  margin: 0 0 1rem;
  max-width: 560px;
}
.page-about .panel-features {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.page-about .panel-features li {
  position: relative;
  padding-left: 1.25rem;
  color: #ccc;
  font-size: 0.95rem;
}
.page-about .panel-features li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--about-accent-orange);
}
.page-about .panel-image img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--about-card-border);
  object-fit: cover;
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
  transition: transform 0.3s ease;
}
.page-about .panel-image img:hover {
  transform: scale(1.01);
}

/* 设计哲学 */
.page-about .about-philosophy {
  padding: var(--about-section-gap) 0;
}
.page-about .about-philosophy-inner {
  position: relative;
}
.page-about .philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}
.page-about .philosophy-item {
  background: var(--about-card-bg);
  border: 1px solid var(--about-card-border);
  border-radius: 16px;
  padding: 1.5rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  position: relative;
  overflow: hidden;
}
.page-about .philosophy-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(155,89,182,0.15);
  border-color: rgba(155,89,182,0.3);
}
.page-about .philosophy-icon {
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-weight: 500;
  font-size: 1.8rem;
  color: var(--about-accent-purple);
  display: block;
  margin-bottom: 0.5rem;
  opacity: 0.6;
}
.page-about .philosophy-item h3 {
  font-family: var(--font-primary, 'Poppins', sans-serif);
  font-weight: 700;
  font-size: 1.2rem;
  color: #fff;
  margin: 0 0 0.5rem;
}
.page-about .philosophy-item p {
  color: var(--about-text-light);
  line-height: 1.5;
  margin: 0;
  font-size: 0.95rem;
}
.page-about .philosophy-visual {
  margin-top: 2rem;
}
.page-about .philosophy-visual img {
  max-width: 100%;
  height: auto;
  border-radius: 16px;
  border: 1px solid var(--about-card-border);
  object-fit: cover;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

/* 联系与备案 */
.page-about .about-contact {
  padding: var(--about-section-gap) 0 3rem;
  background: linear-gradient(0deg, rgba(11,30,54,0.6) 0%, transparent 100%);
}
.page-about .contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}
.page-about .contact-card {
  background: var(--about-card-bg);
  border: 1px solid var(--about-card-border);
  border-radius: 16px;
  padding: 1.5rem;
}
.page-about .contact-card h3 {
  font-family: var(--font-primary, 'Poppins', sans-serif);
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
  margin: 0 0 0.75rem;
}
.page-about .contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.page-about .contact-list li {
  color: var(--about-text-light);
  font-size: 0.95rem;
  line-height: 1.5;
}
.page-about .contact-list a {
  color: var(--about-accent-purple);
  text-decoration: none;
  transition: opacity 0.2s;
}
.page-about .contact-list a:hover {
  opacity: 0.75;
  text-decoration: underline;
}
.page-about .contact-note {
  color: var(--about-text-light);
  font-size: 0.85rem;
  margin-top: 0.75rem;
  opacity: 0.7;
}

/* ===== 响应式：平板与桌面 ===== */
@media (min-width: 640px) {
  .page-about .about-intro-grid {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
  .page-about .about-intro-text {
    flex: 1 1 55%;
  }
  .page-about .about-intro-graphic {
    flex: 0 0 auto;
    justify-content: flex-end;
  }
  .page-about .about-intro-text h1 {
    font-size: 3rem;
  }
  .page-about .panel-inner {
    flex-direction: row;
    align-items: flex-start;
    gap: 2.5rem;
  }
  .page-about .panel-text {
    flex: 1 1 50%;
  }
  .page-about .panel-image {
    flex: 1 1 45%;
  }
  .page-about .philosophy-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .contact-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .page-about .about-intro-text h1 {
    font-size: 3.75rem;
  }
  .page-about .about-intro {
    padding: 2.5rem 2rem 3.5rem;
  }
  .page-about .about-story-content {
    max-width: 820px;
  }
  .page-about .about-keywords {
    gap: 1rem;
  }
  .page-about .keyword-card {
    font-size: 1rem;
    padding: 0.7rem 1.5rem;
  }
}

.page-about {
  --kw-offset: 1rem;
}