/* ==========================================================
   .page-about —— 万博体育当季中文站品牌介绍页
   ========================================================== */

/* 面包屑与头部进距 */
.page-about .about-breadcrumb {
  padding-top: calc(var(--header-height) + 1.5rem);
  padding-bottom: 0.625rem;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--color-muted);
  font-size: 0.875rem;
}

.page-about .breadcrumb a {
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.page-about .breadcrumb a:hover {
  color: var(--color-gold);
}

.page-about .breadcrumb-sep {
  color: var(--color-line);
}

/* 英雄区：超大宣言 + 品牌视觉 */
.page-about .about-hero {
  padding: var(--space-5) 0 var(--space-6);
  border-bottom: 1px solid var(--color-line);
  background:
    radial-gradient(ellipse at 12% 0%, var(--color-bg-soft) 0%, transparent 55%),
    linear-gradient(120deg, transparent 62%, rgba(212, 175, 55, 0.07) 100%);
}

.page-about .about-hero-grid {
  display: grid;
  gap: var(--space-5);
  align-items: center;
}

.page-about .about-hero-copy {
  min-width: 0;
}

.page-about .about-eyebrow {
  display: inline-flex;
  align-items: center;
  margin-bottom: var(--space-3);
  padding: 0.3125rem 0.9375rem;
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-radius: var(--radius-pill);
  background: rgba(212, 175, 55, 0.08);
  color: var(--color-gold);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
}

.page-about .about-season-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 var(--space-3);
  padding: 0.3125rem 0.875rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-bg-soft);
  color: var(--color-muted);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
}

.page-about .about-season-chip::before {
  content: "";
  width: 0.375rem;
  height: 0.375rem;
  border-radius: 50%;
  background: var(--color-gold);
  box-shadow: 0 0 8px rgba(212, 175, 55, 0.7);
}

.page-about .about-hero-title {
  margin: 0 0 var(--space-4);
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 7vw, 4.75rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--color-white);
}

.page-about .about-hero-lead {
  max-width: 40rem;
  margin: 0 0 var(--space-4);
  color: var(--color-muted);
  font-size: 1.0625rem;
  line-height: 1.8;
}

.page-about .about-hero-term {
  position: relative;
  border-bottom: 1px dashed var(--color-gold);
  cursor: help;
  color: var(--color-white);
}

.page-about .about-hero-term-tip {
  display: none;
  position: absolute;
  bottom: calc(100% + 0.625rem);
  left: 0;
  z-index: 30;
  width: 240px;
  max-width: 60vw;
  padding: 0.75rem 0.9375rem;
  border: 1px solid rgba(212, 175, 55, 0.55);
  border-radius: 0.75rem;
  background: var(--color-bg-raised);
  box-shadow: var(--shadow);
  color: var(--color-muted);
  font-size: 0.75rem;
  font-weight: 400;
  line-height: 1.6;
}

.page-about .about-hero-term:hover .about-hero-term-tip,
.page-about .about-hero-term:focus .about-hero-term-tip {
  display: block;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* 图片容器统一样式 */
.page-about .img-ratio {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: var(--ratio, 16 / 9);
  background: var(--color-bg-soft);
}

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

.page-about .about-hero-media .img-ratio {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: 0 1.5rem 3rem rgba(0, 0, 0, 0.28);
}

/* 轨道式章节布局 */
.page-about .about-track-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.page-about .about-track {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.page-about .about-track-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.75rem;
  height: 2.75rem;
  padding: 0 0.625rem;
  border: 1px solid var(--color-gold);
  border-radius: var(--radius-pill);
  background: rgba(212, 175, 55, 0.08);
  color: var(--color-gold);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
}

.page-about .about-track-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--color-gold) 0%, var(--color-line) 100%);
}

.page-about .about-track-label {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .about-track-body {
  min-width: 0;
}

/* 章节标题 */
.page-about .about-section-head {
  margin-bottom: var(--space-5);
}

.page-about .about-section-head .section-subtitle {
  margin-bottom: 0.5rem;
  color: var(--color-gold);
}

.page-about .about-section-head .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-white);
}

/* 区块一：品牌定位 */
.page-about .about-position {
  border-bottom: 1px solid var(--color-line);
}

.page-about .about-position-grid {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-position-text p {
  margin: 0 0 var(--space-3);
  color: var(--color-muted);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.page-about .about-position-text p:last-child {
  margin-bottom: 0;
}

.page-about .about-position-fact .data-panel {
  display: grid;
  gap: 0.125rem;
  padding: var(--space-4);
  border: 1px solid var(--color-line);
  border-top: 2px solid var(--color-gold);
  border-radius: var(--radius);
  background: linear-gradient(145deg, var(--color-bg-soft) 0%, var(--color-bg) 100%);
}

.page-about .about-position-fact .data-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 0.625rem 0;
  border-bottom: 1px solid var(--color-line);
}

.page-about .about-position-fact .data-row:last-child {
  border-bottom: 0;
}

.page-about .about-position-fact .data-label {
  color: var(--color-muted);
  font-size: 0.8125rem;
}

.page-about .about-position-fact .data-value {
  color: var(--color-white);
  font-weight: 500;
  text-align: right;
}

/* 区块二：当季版本亮点 */
.page-about .about-version {
  border-bottom: 1px solid var(--color-line);
  background: linear-gradient(180deg, transparent 0%, rgba(16, 42, 76, 0.4) 100%);
}

.page-about .about-version-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
}

.page-about .about-version-card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  padding: var(--space-4);
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .about-version-card:hover {
  transform: translateY(-2px);
}

.page-about .about-version-key {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  margin-bottom: var(--space-3);
  padding: 0.1875rem 0.625rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  color: var(--color-gold);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
}

.page-about .about-version-card h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-display);
  font-size: 1.25rem;
  line-height: 1.3;
  color: var(--color-white);
}

.page-about .about-version-card p {
  margin: 0 0 var(--space-2);
  color: var(--color-muted);
  font-size: 0.875rem;
  line-height: 1.7;
}

.page-about .about-version-card p:last-child {
  margin-bottom: 0;
}

.page-about .about-version-card.card-accent {
  border-color: rgba(212, 175, 55, 0.65);
  background: linear-gradient(150deg, rgba(212, 175, 55, 0.12) 0%, var(--color-bg-soft) 65%);
}

.page-about .about-version-speed {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: auto;
  padding-top: var(--space-2);
}

.page-about .about-version-dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--color-gold);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.15);
}

/* 区块三：规则更新机制 */
.page-about .about-rules {
  border-bottom: 1px solid var(--color-line);
}

.page-about .about-rules-layout {
  display: grid;
  gap: var(--space-5);
}

.page-about .about-rules-timeline {
  position: relative;
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 var(--space-5) var(--space-5);
  border-left: 1px solid var(--color-line);
}

.page-about .about-timeline-item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-timeline-dot {
  position: absolute;
  top: 0.25rem;
  left: calc(-0.3125rem - 1px);
  width: 0.625rem;
  height: 0.625rem;
  border: 2px solid var(--color-bg);
  border-radius: 50%;
  background: var(--color-gold);
  box-shadow: 0 0 0 1px var(--color-gold);
  transition: box-shadow var(--transition);
}

.page-about .about-timeline-item:hover .about-timeline-dot {
  box-shadow: 0 0 0 5px rgba(212, 175, 55, 0.22);
}

.page-about .about-timeline-content h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-display);
  font-size: 1.125rem;
  color: var(--color-white);
}

.page-about .about-timeline-content p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.875rem;
  line-height: 1.7;
}

.page-about .about-rules-media .img-ratio,
.page-about .about-membership-media .img-ratio {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

/* 区块四：会员等级与资料库权益 */
.page-about .about-membership {
  border-bottom: 1px solid var(--color-line);
  background: radial-gradient(ellipse at 90% 90%, rgba(138, 43, 226, 0.06) 0%, transparent 40%);
}

.page-about .about-membership-layout {
  display: grid;
  gap: var(--space-5);
}

.page-about .about-membership-stairs {
  display: grid;
  gap: var(--space-3);
}

.page-about .about-tier {
  display: grid;
  grid-template-columns: 2.75rem minmax(0, 1fr);
  gap: 0.375rem var(--space-3);
  align-items: center;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--color-bg-soft) 0%, var(--color-bg) 100%);
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .about-tier:hover {
  border-color: var(--color-gold);
  transform: translateX(4px);
}

.page-about .about-tier-level {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-gold);
}

.page-about .about-tier-name {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  color: var(--color-white);
}

.page-about .about-tier-desc {
  grid-column: 2;
  color: var(--color-muted);
  font-size: 0.8125rem;
  line-height: 1.6;
}

.page-about .about-tier:nth-child(1) {
  background: linear-gradient(135deg, rgba(16, 42, 76, 0.6) 0%, rgba(11, 30, 58, 0.4) 100%);
}

.page-about .about-tier:nth-child(2) {
  background: linear-gradient(135deg, rgba(16, 42, 76, 0.7) 0%, rgba(11, 30, 58, 0.5) 100%);
}

.page-about .about-tier:nth-child(3) {
  background: linear-gradient(135deg, rgba(16, 42, 76, 0.8) 0%, rgba(11, 30, 58, 0.6) 100%);
}

.page-about .about-tier:nth-child(4) {
  background: linear-gradient(135deg, rgba(16, 42, 76, 0.9) 0%, rgba(11, 30, 58, 0.7) 100%);
}

.page-about .about-tier:nth-child(5) {
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.14) 0%, rgba(16, 42, 76, 0.9) 70%, rgba(11, 30, 58, 0.7) 100%);
  border-color: rgba(212, 175, 55, 0.55);
}

/* 区块五：备案与内容合规 */
.page-about .about-compliance {
  border-bottom: 1px solid var(--color-line);
}

.page-about .about-compliance-grid {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-compliance-badge {
  position: relative;
  display: inline-flex;
  align-items: center;
  align-self: start;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, var(--color-bg-soft) 0%, var(--color-bg) 100%);
  cursor: help;
  transition: border-color var(--transition);
}

.page-about .about-compliance-badge:hover {
  border-color: var(--color-gold);
}

.page-about .about-compliance-badge:focus {
  outline: 2px solid var(--color-gold);
  outline-offset: 2px;
}

.page-about .about-badge-icon {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  flex-shrink: 0;
  border: 1px solid var(--color-gold);
  border-radius: 50%;
  background: rgba(212, 175, 55, 0.1);
}

.page-about .about-badge-icon::before {
  content: "";
  position: absolute;
  width: 0.375rem;
  height: 0.375rem;
  border-radius: 50%;
  background: var(--color-gold);
  box-shadow: 0 0 12px rgba(212, 175, 55, 0.8);
}

.page-about .about-badge-label {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--color-muted);
  font-size: 0.75rem;
}

.page-about .about-badge-value {
  color: var(--color-white);
  font-size: 0.9375rem;
  font-weight: 600;
}

.page-about .about-badge-tip {
  display: none;
  position: absolute;
  top: calc(100% + 0.625rem);
  left: 0;
  z-index: 30;
  width: 280px;
  max-width: 70vw;
  padding: 0.75rem 0.9375rem;
  border: 1px solid var(--color-line);
  border-radius: 0.75rem;
  background: var(--color-bg-raised);
  box-shadow: var(--shadow);
  color: var(--color-muted);
  font-size: 0.75rem;
  line-height: 1.6;
}

.page-about .about-compliance-badge:hover .about-badge-tip,
.page-about .about-compliance-badge:focus .about-badge-tip {
  display: block;
}

.page-about .about-compliance-note p {
  margin: 0 0 var(--space-3);
  color: var(--color-muted);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.page-about .about-compliance-note p:last-child {
  margin-bottom: 0;
}

.page-about .about-compliance-note a {
  color: var(--color-gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(212, 175, 55, 0.4);
  transition: border-color var(--transition);
}

.page-about .about-compliance-note a:hover {
  border-bottom-color: var(--color-gold);
}

.page-about .about-compliance-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-line);
}

/* 媒体查询：平板与桌面 */
@media (min-width: 768px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: var(--space-5);
  }

  .page-about .about-position-grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: var(--space-5);
  }

  .page-about .about-version-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4);
  }

  .page-about .about-rules-layout,
  .page-about .about-membership-layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: var(--space-5);
    align-items: start;
  }

  .page-about .about-compliance-grid {
    grid-template-columns: 340px 1fr;
    gap: var(--space-5);
  }
}

@media (min-width: 992px) {
  .page-about .about-track-layout {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: var(--space-5);
  }

  .page-about .about-track {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
    padding-top: 0.5rem;
  }

  .page-about .about-track-line {
    flex: none;
    width: 1px;
    height: 100%;
    min-height: 96px;
    background: linear-gradient(180deg, var(--color-gold) 0%, var(--color-line) 75%);
  }

  .page-about .about-track-label {
    writing-mode: vertical-rl;
  }

  .page-about .about-version-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-tier:hover {
    transform: translateX(6px);
  }
}

@media (min-width: 1200px) {
  .page-about .about-membership-stairs {
    gap: var(--space-4);
  }

  .page-about .about-tier:nth-child(2) {
    margin-left: 1.5rem;
  }

  .page-about .about-tier:nth-child(3) {
    margin-left: 3rem;
  }

  .page-about .about-tier:nth-child(4) {
    margin-left: 4.5rem;
  }

  .page-about .about-tier:nth-child(5) {
    margin-left: 6rem;
  }
}

.page-about {
  --ratio: inherit;
}