/* ===== page-about · 品牌价值 ===== */
.page-about {
  --about-soft: #3E524B;
  --about-rule-tint: rgba(201, 162, 39, 0.10);
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, rgba(243, 235, 221, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(243, 235, 221, 0.06) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--on-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  padding: calc(var(--header-h) + 26px) 0 0;
  overflow-x: hidden;
}

.page-about .about-wrap {
  width: min(100% - 40px, 1400px);
  margin-inline: auto;
}

/* —— 文字层级 —— */
.page-about h1 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(30px, 7.2vw, 58px);
  line-height: 1.16;
  letter-spacing: 0.02em;
  color: var(--white);
  margin: 14px 0 18px;
}
.page-about h1 em {
  font-style: normal;
  color: var(--gold);
  border-bottom: 2px solid var(--line-strong);
  padding-bottom: 2px;
}
.page-about h2 {
  font-family: var(--font-serif);
  font-size: clamp(23px, 4.4vw, 34px);
  line-height: 1.32;
  letter-spacing: 0.02em;
  color: var(--white);
  margin: 0 0 14px;
}
.page-about h3 {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.45;
  color: var(--white);
  margin: 0 0 8px;
}
.page-about p {
  margin: 0 0 14px;
}

/* —— 面包屑与首屏 —— */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--on-ink-dim);
}
.page-about .breadcrumbs a {
  color: var(--gold-soft);
  text-decoration: none;
}
.page-about .breadcrumbs a:hover {
  text-decoration: underline;
}
.page-about .breadcrumbs__sep {
  color: var(--line-strong);
}

.page-about .about-hero {
  padding-bottom: 34px;
  border-bottom: 1px solid var(--line);
}
.page-about .about-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--gold);
  margin: 18px 0 0;
}
.page-about .about-lead {
  max-width: 62ch;
  font-size: clamp(15px, 2.4vw, 18px);
  color: var(--on-ink);
  margin-bottom: 0;
}
.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* —— 章节骨架 —— */
.page-about .about-sec {
  padding: 46px 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-sec--last {
  border-bottom: 0;
  padding-bottom: 68px;
}
.page-about .about-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--gold);
  margin-bottom: 12px;
}
.page-about .about-kicker::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--gold);
}

/* —— 图文双栏 —— */
.page-about .about-split {
  display: grid;
  gap: var(--gap);
}
.page-about .about-split__text {
  min-width: 0;
}
@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
  }
  .page-about .about-split__text {
    grid-column: 1 / 7;
  }
  .page-about .about-split__fig {
    grid-column: 8 / 13;
  }
}

/* —— 图片容器 —— */
.page-about .about-fig {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
  min-width: 0;
}
.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .about-fig figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--on-ink-dim);
  padding: 10px 12px;
  border-top: 1px solid var(--line-soft);
}

/* —— 三条守则（错落卡片） —— */
.page-about .about-rules-intro {
  max-width: 64ch;
  color: var(--on-ink-dim);
}
.page-about .about-rules-wrap {
  display: grid;
  gap: var(--gap);
  margin-top: 8px;
}
.page-about .about-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--gap);
  min-width: 0;
}
.page-about .rule-card {
  position: relative;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(28, 74, 63, 0.55), rgba(18, 58, 49, 0.92));
  padding: 26px 22px 20px;
}
.page-about .rule-card::after {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  width: 42px;
  height: 2px;
  background: var(--gold);
}
.page-about .rule-card__num {
  position: absolute;
  top: 14px;
  right: 10px;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.28em;
  color: var(--gold);
}
.page-about .rule-card__promise {
  color: var(--white);
  font-weight: 600;
  font-size: 15.5px;
  margin-bottom: 10px;
}
.page-about .rule-card p {
  font-size: 15px;
  color: var(--on-ink);
  margin-bottom: 10px;
}
.page-about .rule-card details {
  border-top: 1px solid var(--line-soft);
  padding-top: 10px;
  margin-top: 4px;
}
.page-about .rule-card summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--gold-soft);
}
.page-about .rule-card summary::-webkit-details-marker {
  display: none;
}
.page-about .rule-card summary::before {
  content: "＋ ";
}
.page-about .rule-card details[open] summary::before {
  content: "－ ";
}
.page-about .rule-card details p {
  margin: 10px 0 0;
  font-size: 14.5px;
  color: var(--on-ink-dim);
}
.page-about .about-rules-aside {
  max-width: 360px;
}
@media (min-width: 980px) {
  .page-about .about-rules-wrap {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }
  .page-about .about-rules {
    grid-column: 1 / 10;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
  .page-about .rule-card:nth-child(2) {
    margin-top: 48px;
  }
  .page-about .rule-card:nth-child(3) {
    margin-top: 24px;
  }
  .page-about .about-rules-aside {
    grid-column: 10 / 13;
    margin-top: 96px;
  }
}

/* —— 九个频道索引 —— */
.page-about .channel-index {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .channel-index li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 12px;
  padding: 10px 8px 10px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14.5px;
  align-items: baseline;
}
.page-about .ci-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}
.page-about .ci-name {
  color: var(--white);
  font-weight: 600;
}
.page-about .ci-desc {
  grid-column: 2;
  color: var(--on-ink-dim);
  font-size: 13px;
}
.page-about .ci-flag {
  grid-column: 2;
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink);
  background: var(--gold-soft);
  padding: 1px 7px;
  margin-top: 4px;
}
.page-about .channel-index li:has(.ci-flag) {
  background: var(--about-rule-tint);
  box-shadow: inset 2px 0 0 var(--gold-soft);
  padding-left: 10px;
}

/* —— 三轮比对 —— */
.page-about .about-steps {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
.page-about .about-steps li {
  background: var(--ink);
  padding: 22px 18px;
  min-width: 0;
}
.page-about .step-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
  border-bottom: 1px solid var(--line);
  padding-bottom: 3px;
  margin-bottom: 10px;
}
.page-about .about-steps p {
  font-size: 14.5px;
  color: var(--on-ink-dim);
  margin: 0;
}
@media (min-width: 760px) {
  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .about-proof-note {
  margin-top: 20px;
  max-width: 68ch;
  font-size: 15px;
  color: var(--on-ink);
  border-left: 1px solid var(--line-strong);
  padding-left: 16px;
}

/* —— 时间轴 —— */
.page-about .about-scale-intro {
  max-width: 58ch;
  color: var(--on-ink-dim);
}
.page-about .about-timeline {
  list-style: none;
  margin: 4px 0 34px;
  padding: 0 0 0 24px;
  position: relative;
  max-width: 620px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line);
}
.page-about .about-timeline li {
  position: relative;
  padding: 0 0 22px;
}
.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 10px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--gold);
}
.page-about .about-timeline li:hover::before,
.page-about .about-timeline li:focus-within::before {
  background: var(--gold-soft);
}
.page-about .tl-stage {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--gold);
  text-transform: uppercase;
}
.page-about .tl-text {
  margin: 4px 0 4px;
  color: var(--white);
  font-size: 15.5px;
}
.page-about .tl-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--sage);
  transition: color 180ms ease;
}
.page-about .about-timeline li:hover .tl-note,
.page-about .about-timeline li:focus-within .tl-note {
  color: var(--gold-soft);
}

/* —— 规模数据条 —— */
.page-about .about-scale {
  display: grid;
  gap: 1px;
  background: rgba(14, 42, 36, 0.22);
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold);
  background-clip: padding-box;
}
.page-about .scale-cell {
  background: var(--cream);
  padding: 22px 18px;
  min-width: 0;
}
.page-about .scale-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 6vw, 40px);
  line-height: 1.1;
  letter-spacing: 0.06em;
  color: var(--ink);
}
.page-about .scale-plus {
  font-size: 0.62em;
  color: var(--amber);
  margin-left: 2px;
}
.page-about .scale-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--about-soft);
}
@media (min-width: 720px) {
  .page-about .about-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* —— 下一站 —— */
.page-about .about-next {
  display: grid;
  gap: var(--gap);
  margin-top: 6px;
}
.page-about .next-card {
  display: block;
  position: relative;
  border: 1px solid var(--line);
  background: var(--ink-2);
  padding: 24px 20px;
  text-decoration: none;
  color: inherit;
  transition: background-color 180ms ease, border-color 180ms ease;
}
.page-about .next-card::after {
  content: "→";
  position: absolute;
  right: 16px;
  bottom: 14px;
  font-family: var(--font-mono);
  color: var(--gold);
}
.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  background: var(--ink-3);
  border-color: var(--line-strong);
}
.page-about .next-card__tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold-soft);
  margin-bottom: 8px;
}
.page-about .next-card__title {
  display: block;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 22px;
  color: var(--white);
  letter-spacing: 0.02em;
  margin-bottom: 8px;
}
.page-about .next-card__desc {
  display: block;
  font-size: 14.5px;
  color: var(--on-ink-dim);
  padding-right: 28px;
}
@media (min-width: 820px) {
  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .about-next__meta {
  margin-top: 22px;
  font-size: 14px;
  color: var(--on-ink-dim);
}
.page-about .about-next__meta a {
  color: var(--gold-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}
.page-about .about-next__meta a:hover {
  border-bottom-color: var(--gold-soft);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .next-card,
  .page-about .tl-note {
    transition: none;
  }
}
</main>