/* ===== 页面-about · 品牌档案 ===== */
.page-about {
  position: relative;
  overflow-x: hidden;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 82% 8%, rgba(255, 215, 0, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 8% 55%, rgba(230, 57, 70, 0.05) 0%, transparent 40%),
    radial-gradient(ellipse at 75% 85%, rgba(255, 215, 0, 0.04) 0%, transparent 45%);
  z-index: 0;
}

.page-about .container {
  position: relative;
  z-index: 1;
}

/* ===== 页面头部 ===== */
.page-about .about-head {
  padding-top: clamp(40px, 7vw, 80px);
  padding-bottom: clamp(36px, 6vw, 64px);
}

.page-about .about-head .breadcrumbs {
  margin-bottom: 28px;
}

.page-about .about-head .kicker {
  margin-bottom: 14px;
  color: var(--accent-gold);
  letter-spacing: 0.2em;
}

.page-about .about-head .page-title {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 6vw, 4.1rem);
  line-height: 1.08;
  letter-spacing: 0.02em;
  margin: 0 0 24px;
  text-transform: uppercase;
}

.page-about .about-head .page-title span {
  display: block;
  background: linear-gradient(135deg, #FFD700 0%, #E63946 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-head .page-desc {
  max-width: 680px;
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.8;
  border-left: 3px solid var(--accent-red);
  padding-left: 20px;
}

/* ===== 通用面板主体 ===== */
.page-about .section-panel {
  position: relative;
  padding-top: clamp(56px, 9vw, 100px);
  padding-bottom: clamp(56px, 9vw, 100px);
  border-top: 1px solid rgba(43, 45, 66, 0.7);
}

.page-about .section-panel .panel-head {
  max-width: 720px;
  margin-bottom: clamp(32px, 6vw, 56px);
}

.page-about .section-panel .panel-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.9rem);
  line-height: 1.12;
  margin: 0 0 16px;
  letter-spacing: 0.03em;
}

.page-about .section-panel .panel-desc {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.75;
}

.page-about .kicker {
  color: var(--accent-gold);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0 0 12px;
  font-weight: 700;
}

/* ===== 01 · 核心理念 ===== */
.page-about .about-concept {
  background: radial-gradient(ellipse at 85% 20%, rgba(255, 215, 0, 0.08) 0%, transparent 50%);
}

.page-about .concept-formula {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-bottom: 28px;
}

.page-about .formula-node {
  background: var(--bg-panel);
  border: 1px solid var(--line-regular);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  color: var(--text-primary);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  transition: border-color 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}

.page-about .formula-node:hover {
  border-color: rgba(255, 215, 0, 0.35);
  transform: translateY(-2px);
}

.page-about .formula-op,
.page-about .formula-eq {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--accent-gold);
  line-height: 1;
  min-height: 34px;
}

.page-about .formula-eq {
  color: var(--accent-red);
}

.page-about .formula-result {
  background: linear-gradient(135deg, #FFD700 0%, #E63946 100%);
  border: none;
  color: #0B0B0D;
  font-weight: 700;
  box-shadow: 0 8px 32px rgba(255, 215, 0, 0.16);
}

.page-about .concept-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .concept-points li {
  background: var(--bg-surface);
  border: 1px solid rgba(43, 45, 66, 0.5);
  border-radius: var(--radius-md);
  padding: 16px 20px 16px 38px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  position: relative;
}

.page-about .concept-points li::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 21px;
  width: 10px;
  height: 10px;
  background: linear-gradient(135deg, #FFD700 0%, #E63946 100%);
  border-radius: 50%;
  transform: rotate(45deg);
}

/* ===== 02 · 发展历程 ===== */
.page-about .history-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}

.page-about .history-aside {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-history-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(43, 45, 66, 0.6);
}

.page-about .history-note {
  background: var(--bg-panel);
  border: 1px solid rgba(43, 45, 66, 0.6);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.page-about .history-num {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  color: var(--accent-gold);
  line-height: 1;
  white-space: nowrap;
}

.page-about .history-note p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.6;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 26px;
  width: 2px;
  background: linear-gradient(to bottom, #FFD700 0%, #E63946 55%, rgba(43, 45, 66, 0.4) 100%);
  opacity: 0.3;
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 32px 64px;
}

.page-about .timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .timeline-year {
  position: absolute;
  left: 0;
  top: 0;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-panel);
  border: 1px solid var(--line-regular);
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-size: 0.95rem;
  color: var(--accent-gold);
  letter-spacing: 0.04em;
  z-index: 1;
}

.page-about .timeline-item[data-active="true"] .timeline-year {
  border-color: rgba(255, 215, 0, 0.5);
  box-shadow: 0 0 24px rgba(255, 215, 0, 0.12);
}

.page-about .timeline-body {
  background: var(--bg-panel);
  border: 1px solid rgba(43, 45, 66, 0.6);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: border-color 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}

.page-about .timeline-item:hover .timeline-body,
.page-about .timeline-item[data-active="true"] .timeline-body {
  border-color: rgba(255, 215, 0, 0.35);
  transform: translateX(4px);
}

.page-about .timeline-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  letter-spacing: 0.04em;
}

.page-about .timeline-body p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.65;
}

/* ===== 03 · 数据能力 ===== */
.page-about .data-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-data-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(43, 45, 66, 0.6);
  position: relative;
}

.page-about .data-stats {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.page-about .data-strip {
  background: var(--bg-panel);
  border: 1px solid var(--line-regular);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}

.page-about .data-item {
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .data-label {
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.page-about .data-value {
  font-family: var(--font-heading);
  font-size: 2rem;
  color: var(--accent-gold);
  line-height: 1;
}

.page-about .data-footnote {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.7;
  border-left: 2px solid var(--line-regular);
  padding-left: 16px;
}

.page-about .img-container img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== 04 · 共识机制 ===== */
.page-about .about-consensus {
  background: radial-gradient(ellipse at 8% 32%, rgba(230, 57, 70, 0.05) 0%, transparent 40%);
}

.page-about .consensus-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.page-about .consensus-steps {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .consensus-step {
  background: var(--bg-panel);
  border: 1px solid var(--line-regular);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  display: grid;
  grid-template-columns: 44px 1fr;
  grid-template-rows: auto auto;
  column-gap: 14px;
  align-items: start;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s var(--ease-out);
}

.page-about .consensus-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(135deg, #FFD700 0%, #E63946 100%);
  opacity: 0;
  transition: opacity 0.3s var(--ease-out);
}

.page-about .consensus-step:hover::before,
.page-about .consensus-step[data-active="true"]::before {
  opacity: 1;
}

.page-about .step-num {
  grid-row: 1 / 3;
  font-family: var(--font-heading);
  font-size: 1.9rem;
  color: var(--accent-red);
  line-height: 1;
}

.page-about .consensus-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  letter-spacing: 0.03em;
}

.page-about .consensus-step p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.86rem;
  line-height: 1.7;
}

.page-about .consensus-note {
  margin: 14px 0 0;
  padding: 16px 20px;
  background: rgba(230, 57, 70, 0.06);
  border: 1px solid rgba(230, 57, 70, 0.25);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.page-about .about-consensus-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(43, 45, 66, 0.6);
}

/* ===== 05 · 资质与合作 ===== */
.page-about .about-credential {
  background: radial-gradient(ellipse at 90% 65%, rgba(255, 215, 0, 0.04) 0%, transparent 50%);
}

.page-about .credential-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .credential-item {
  background: var(--bg-panel);
  border: 1px solid var(--line-regular);
  border-radius: var(--radius-lg);
  padding: 26px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.3s var(--ease-out), border-color 0.3s var(--ease-out);
}

.page-about .credential-item:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 215, 0, 0.3);
}

.page-about .credential-tag {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-gold);
  border: 1px solid rgba(255, 215, 0, 0.3);
  border-radius: var(--radius-full);
  padding: 6px 14px;
  align-self: flex-start;
}

.page-about .credential-item h3 {
  margin: 8px 0 0;
  font-family: var(--font-heading);
  font-size: 1.4rem;
  letter-spacing: 0.03em;
}

.page-about .credential-item p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.7;
}

/* ===== 06 · 服务保障 ===== */
.page-about .about-support {
  background: linear-gradient(180deg, rgba(30, 30, 40, 0.25) 0%, rgba(11, 11, 13, 0.8) 100%);
}

.page-about .support-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .support-item {
  background: var(--bg-surface);
  border: 1px solid rgba(43, 45, 66, 0.6);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 0.3s var(--ease-out);
}

.page-about .support-item:hover {
  border-color: rgba(255, 215, 0, 0.35);
}

.page-about .support-item h3 {
  margin: 0;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--text-primary);
  line-height: 1.5;
}

.page-about .support-item p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.84rem;
  line-height: 1.7;
}

.page-about .support-item .card-link {
  color: var(--accent-gold);
  text-decoration: none;
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-top: auto;
}

.page-about .support-item .card-link:hover {
  text-decoration: underline;
}

/* ===== 底部 CTA ===== */
.page-about .about-cta {
  position: relative;
  padding: 0 0 clamp(48px, 8vw, 96px);
}

.page-about .cta-inner {
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.14) 0%, rgba(230, 57, 70, 0.1) 100%);
  border: 1px solid rgba(255, 215, 0, 0.2);
  border-radius: var(--radius-lg);
  padding: clamp(28px, 5vw, 48px);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.page-about .cta-copy .kicker {
  margin-bottom: 8px;
}

.page-about .cta-copy h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  margin: 0 0 12px;
  letter-spacing: 0.03em;
}

.page-about .cta-copy .page-desc {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.7;
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ===== 响应式增强 ===== */
@media (min-width: 640px) {
  .page-about .concept-points {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .data-strip {
    grid-template-columns: repeat(2, 1fr);
    padding: 24px;
    gap: 16px;
  }

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

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

  .page-about .cta-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .page-about .cta-actions {
    flex-shrink: 0;
  }
}

@media (min-width: 860px) {
  .page-about .concept-formula {
    grid-template-columns: 1fr 32px 1fr 32px 1fr 40px 1.25fr;
    align-items: center;
    gap: 0;
  }

  .page-about .formula-node {
    padding: 24px 20px;
    min-height: 96px;
  }

  .page-about .formula-op,
  .page-about .formula-eq {
    min-height: auto;
  }
}

@media (min-width: 960px) {
  .page-about .history-layout {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 48px;
  }

  .page-about .history-aside {
    position: sticky;
    top: 100px;
  }

  .page-about .data-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .consensus-layout {
    grid-template-columns: 1fr 0.9fr;
    gap: 48px;
  }
}

@media (min-width: 1240px) {
  .page-about .credential-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .support-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

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