/* ===== 品牌总览 · page-about ===== */
.page-about {
  background: var(--brand-porcelain);
  color: var(--brand-ink);
}

.page-about .about-crumb {
  padding-top: clamp(14px, 2.4vw, 22px);
}

/* ---- 首屏框景 ---- */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(12px, 2vw, 20px);
  background:
    radial-gradient(120% 150% at 86% 6%, rgba(91, 44, 111, 0.6) 0%, rgba(46, 20, 55, 0) 60%),
    var(--brand-deep);
  color: var(--brand-porcelain);
  border-top: 1px solid var(--line-gold);
  border-bottom: 1px solid var(--line-gold);
  overflow: hidden;
}

.page-about .about-hero__inner {
  position: relative;
  padding-top: clamp(28px, 5.5vw, 64px);
  padding-bottom: clamp(22px, 4vw, 46px);
}

.page-about .about-frame {
  position: relative;
  border: 1px solid var(--line-gold);
  padding: clamp(20px, 4vw, 44px);
}

.page-about .about-frame::before,
.page-about .about-frame::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1px solid var(--brand-gold);
}

.page-about .about-frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-frame::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

.page-about .about-frame .eyebrow {
  color: var(--brand-gold);
}

.page-about .about-frame h1 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(28px, 4.4vw, 52px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 12px 0 0;
  color: var(--brand-porcelain);
}

.page-about .about-hero__lede {
  max-width: 60ch;
  margin-top: clamp(14px, 2.4vw, 22px);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: rgba(253, 254, 254, 0.86);
}

.page-about .about-hero__actions {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-scale {
  height: 20px;
  margin-top: clamp(18px, 3vw, 30px);
  border-top: 1px solid var(--line-gold);
  background-image: repeating-linear-gradient(90deg, var(--line-gold) 0 1px, transparent 1px 28px);
  background-repeat: no-repeat;
  background-position: left top;
  background-size: 100% 10px;
  opacity: 0.75;
}

/* ---- 规模数据条 ---- */
.page-about .about-stats {
  border-bottom: 1px solid var(--line-soft);
  background: var(--brand-porcelain);
}

.page-about .about-stats__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border-left: 1px solid var(--line-soft);
  border-right: 1px solid var(--line-soft);
}

.page-about .about-stats__item {
  background: var(--brand-porcelain);
  padding: clamp(16px, 2.4vw, 26px) clamp(12px, 1.8vw, 20px);
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.02em;
  font-size: clamp(22px, 2.8vw, 32px);
  color: var(--brand-primary);
  line-height: 1.1;
}

.page-about .about-stats__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--brand-ink);
  opacity: 0.72;
}

/* ---- 主栅格：赛季刻度 + 内容 ---- */
.page-about .about-ledger {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 52px);
  padding-top: clamp(34px, 6vw, 74px);
  padding-bottom: clamp(42px, 7vw, 90px);
}

/* ---- 赛季刻度栏 ---- */
.page-about .season-rail {
  border: 1px solid var(--line-soft);
  background: var(--brand-mist);
  padding: 14px 16px;
}

.page-about .season-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--brand-primary);
}

.page-about .season-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 18px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .season-rail__item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 4px 0 8px;
  border-bottom: 2px solid transparent;
}

.page-about .season-rail__id {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--brand-primary);
}

.page-about .season-rail__year {
  font-size: 12px;
  opacity: 0.62;
}

.page-about .season-rail__item.is-current {
  border-bottom-color: var(--brand-accent);
}

.page-about .season-rail__item.is-current .season-rail__id {
  color: var(--brand-accent);
}

/* ---- 章节通用 ---- */
.page-about .about-section + .about-section {
  margin-top: clamp(40px, 6vw, 78px);
}

.page-about .about-section__head {
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 14px;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-section h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(23px, 3.1vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.005em;
  margin: 8px 0 0;
  color: var(--brand-primary);
}

.page-about .about-section .prose p {
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
}

.page-about .about-section .prose p + p {
  margin-top: 1.1em;
}

.page-about .about-inline-note {
  margin-top: clamp(18px, 2.6vw, 26px);
  padding-left: 14px;
  border-left: 3px solid var(--brand-moss);
  font-size: 14px;
  line-height: 1.8;
  color: var(--brand-ink);
}

.page-about .about-inline-note a {
  color: var(--brand-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---- 图片 ---- */
.page-about .about-figure {
  margin: 0 0 clamp(20px, 3vw, 30px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line-soft);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--brand-ink);
  opacity: 0.62;
}

/* ---- 节点地图 ---- */
.page-about .node-map {
  list-style: none;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(12px, 2vw, 18px);
}

.page-about .node-map__item {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--brand-mist);
  border: 1px solid var(--line-soft);
  transition: border-color var(--t-fast) var(--ease-out), background-color var(--t-fast) var(--ease-out);
}

.page-about .node-map__item:hover {
  border-color: var(--brand-accent);
  background: var(--brand-porcelain);
}

.page-about .node-map__item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 18px;
  width: 40px;
  height: 3px;
  background: var(--brand-accent);
}

.page-about .node-map__id {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 500;
  color: var(--brand-primary);
}

.page-about .node-map__title {
  margin: 8px 0 8px;
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 600;
  color: var(--brand-ink);
}

.page-about .node-map__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--brand-ink);
  opacity: 0.8;
}

/* ---- 产品线卡片 ---- */
.page-about .line-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 26px);
}

.page-about .line-card {
  position: relative;
  background: var(--brand-porcelain);
  border: 1px solid var(--brand-primary);
  border-left-width: 4px;
  padding: clamp(18px, 2.4vw, 26px);
  box-shadow: 6px 6px 0 rgba(91, 44, 111, 0.09);
  transition: border-color var(--t-fast) var(--ease-out), box-shadow var(--t-fast) var(--ease-out);
}

.page-about .line-card:hover,
.page-about .line-card:focus-within {
  border-color: var(--brand-accent);
  box-shadow: 6px 6px 0 rgba(30, 132, 73, 0.16);
}

.page-about .line-card__meta {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--brand-accent);
}

.page-about .line-card__title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--brand-primary);
  line-height: 1.4;
}

.page-about .line-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--brand-ink);
  opacity: 0.85;
}

/* ---- 可复制编号 ---- */
.page-about .copy-token {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--brand-primary);
  background: transparent;
  border: 1px dashed var(--line-soft);
  padding: 2px 8px;
  cursor: pointer;
  transition: border-color var(--t-fast) var(--ease-out), color var(--t-fast) var(--ease-out);
}

.page-about .copy-token:hover,
.page-about .copy-token:focus-visible {
  border-color: var(--brand-accent);
  color: var(--brand-accent);
  outline: none;
}

.page-about .copy-token[data-copied]::after {
  content: " 已复制";
  font-family: var(--font-sans);
  font-size: 11px;
  color: var(--brand-accent);
}

/* ---- 数据条 ---- */
.page-about .metric {
  margin-bottom: clamp(14px, 2vw, 18px);
}

.page-about .metric__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
  font-size: 14px;
}

.page-about .metric__label {
  color: var(--brand-ink);
}

.page-about .metric__val {
  font-family: var(--font-mono);
  color: var(--brand-accent);
  letter-spacing: 0.02em;
}

.page-about .metric__track {
  height: 6px;
  background: var(--brand-mist);
  overflow: hidden;
}

.page-about .metric__fill {
  display: block;
  height: 100%;
  width: var(--fill, 0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--brand-primary), var(--brand-accent));
  animation: about-fill 900ms var(--ease-out) both;
}

@keyframes about-fill {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .metric__fill { animation: none; }
}

/* ---- 规格表 ---- */
.page-about .about-spec {
  margin-top: clamp(22px, 3.4vw, 34px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-spec__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-spec__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--brand-primary);
}

.page-about .about-spec__val {
  font-size: 15px;
  line-height: 1.7;
}

/* ---- 赛季折线 ---- */
.page-about .season-chart {
  display: block;
  width: 100%;
  height: auto;
  margin: clamp(16px, 2.6vw, 26px) 0 clamp(20px, 3vw, 30px);
  overflow: visible;
}

.page-about .season-chart__grid {
  stroke: var(--line-soft);
  stroke-width: 1;
}

.page-about .season-chart__line {
  fill: none;
  stroke: var(--brand-accent);
  stroke-width: 2.5;
  stroke-linejoin: round;
}

.page-about .season-chart__dot {
  fill: var(--brand-porcelain);
  stroke: var(--brand-primary);
  stroke-width: 2;
}

.page-about .season-chart__dot--accent {
  fill: var(--brand-accent);
  stroke: var(--brand-accent);
}

.page-about .season-chart__label {
  font-family: var(--font-mono);
  font-size: 11px;
  fill: var(--brand-ink);
  opacity: 0.7;
}

/* ---- 赛季日志 ---- */
.page-about .season-log {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .season-log__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: clamp(14px, 2vw, 20px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .season-log__item:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .season-log__id {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--brand-accent);
}

.page-about .season-log__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--brand-ink);
}

/* ---- 收尾邀请 ---- */
.page-about .about-cta {
  background:
    linear-gradient(120deg, rgba(91, 44, 111, 0.55) 0%, rgba(46, 20, 55, 0.9) 62%),
    var(--brand-deep);
  color: var(--brand-porcelain);
  border-top: 1px solid var(--line-gold);
  padding: clamp(34px, 6vw, 64px) 0;
}

.page-about .about-cta .eyebrow {
  color: var(--brand-gold);
}

.page-about .about-cta h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.3;
  margin: 10px 0 0;
  color: var(--brand-porcelain);
}

.page-about .about-cta__text {
  max-width: 58ch;
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(253, 254, 254, 0.82);
}

.page-about .about-cta .btn-row {
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---- 窄屏优化 ---- */
@media (max-width: 419px) {
  .page-about .about-stats__grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .season-rail__list {
    gap: 12px;
  }
}

/* ---- 平板 ---- */
@media (min-width: 600px) {
  .page-about .about-spec__row {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }

  .page-about .season-log__item {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: clamp(14px, 2.4vw, 28px);
  }

  .page-about .season-log__id {
    padding-top: 2px;
  }
}

@media (min-width: 720px) {
  .page-about .about-stats__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .node-map {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .line-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-figure--narrow {
    max-width: 62%;
  }
}

/* ---- 桌面：左刻度 + 右内容 ---- */
@media (min-width: 960px) {
  .page-about .about-ledger {
    grid-template-columns: 186px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .season-rail {
    position: sticky;
    top: 96px;
    background: transparent;
    border: 0;
    border-left: 1px solid var(--line-soft);
    padding: 4px 0 4px 18px;
  }

  .page-about .season-rail__list {
    display: block;
    overflow: visible;
  }

  .page-about .season-rail__item {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--line-soft);
    white-space: normal;
  }

  .page-about .season-rail__id {
    display: block;
    margin-bottom: 4px;
  }

  .page-about .season-rail__year {
    display: block;
  }

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

@media (min-width: 1040px) {
  .page-about .about-stats__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

.page-about {
  --fill: currentColor;
}