/* ===== 品牌文化页（/culture/）专属样式 ===== */

.page-about {
  --about-side-w: 300px;
  --about-slate: #4A5A6B;
  display: block;
  background-color: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  padding-bottom: 56px;
}

/* ---------- 首屏：主题声明 + 关键数字 ---------- */

.page-about .about-masthead {
  border-bottom: 1px solid var(--line);
  background-image: radial-gradient(circle at 86% 6%, rgba(124, 92, 255, 0.16), transparent 46%);
}

.page-about .about-masthead-inner {
  padding-top: 26px;
  padding-bottom: 40px;
}

.page-about .crumbs {
  margin-bottom: 26px;
}

.page-about .crumbs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .crumbs-item a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 120ms var(--ease), border-color 120ms var(--ease);
}

.page-about .crumbs-item a:hover,
.page-about .crumbs-item a:focus-visible {
  color: var(--text);
  border-bottom-color: var(--signal);
}

.page-about .crumbs-item[aria-current="page"] {
  color: var(--text);
}

.page-about .crumbs-item + .crumbs-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--teal);
}

.page-about .about-h1 {
  max-width: 24ch;
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: 30px;
  font-weight: 900;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .lede {
  max-width: 40em;
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 14px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .stat-label {
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 堆叠面板 ---------- */

.page-about .about-panel {
  background-color: var(--panel);
  border-top: 1px solid var(--line);
  padding: 40px 0;
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-panel:hover {
  transform: translateY(-2px);
  border-top-color: var(--signal);
}

.page-about .about-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-side {
  padding-top: 4px;
}

.page-about .panel-num {
  display: inline-block;
  padding-left: 10px;
  border-left: 1px solid var(--signal);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--muted);
  transition: color 120ms var(--ease);
}

.page-about .about-panel:hover .panel-num {
  color: var(--signal);
}

.page-about .about-side-note {
  max-width: 30ch;
  margin: 14px 0 0;
  padding-left: 12px;
  border-left: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: 0.02em;
  color: var(--muted);
  opacity: 0.86;
  transition: transform 180ms var(--ease), opacity 180ms var(--ease);
}

.page-about .about-panel:hover .about-side-note {
  transform: translateX(6px);
  opacity: 1;
}

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

.page-about .about-body > h2 {
  position: relative;
  margin: 0 0 20px;
  padding-bottom: 16px;
  font-family: var(--font-head);
  font-size: 23px;
  font-weight: 900;
  line-height: 1.34;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-body > h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 1px;
  background: var(--signal);
}

.page-about .about-body p {
  max-width: 42em;
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

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

.page-about .about-lead {
  color: var(--muted) !important;
}

.page-about .about-tail {
  margin-top: 20px !important;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--muted) !important;
}

/* ---------- 三条编辑原则 ---------- */

.page-about .principles {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .principle {
  position: relative;
  padding: 22px 0 22px 20px;
  border-top: 1px solid var(--line);
}

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

.page-about .principle::before {
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  bottom: 26px;
  width: 2px;
  background: linear-gradient(180deg, var(--violet), transparent);
}

.page-about .principle-no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--violet);
}

.page-about .principle h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--text);
}

.page-about .principle p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 结构改版时间线 ---------- */

.page-about .about-figure {
  max-width: 100%;
  margin: 0 0 30px;
  border: 1px solid var(--line);
  background-color: var(--ink);
}

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

.page-about .media-caption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .timeline {
  position: relative;
  margin: 8px 0 0;
  padding: 4px 0 0 28px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 14px;
  width: 1px;
  background: var(--line);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 26px;
  outline-offset: 4px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 7px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 1px solid var(--line);
  transition: background-color 120ms var(--ease), border-color 120ms var(--ease);
}

.page-about .tl-item--now::before {
  background: var(--teal);
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(31, 199, 166, 0.16);
}

.page-about .tl-item:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 4px;
}

.page-about .tl-item:focus-visible::before,
.page-about .tl-item:hover::before {
  background: var(--signal);
  border-color: var(--signal);
}

.page-about .tl-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text);
}

.page-about .tl-ver {
  padding: 2px 7px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .tl-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--text);
}

.page-about .tl-flag {
  padding: 2px 7px;
  background: var(--teal);
  color: var(--on-amber);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.page-about .tl-problem,
.page-about .tl-result {
  margin: 0 0 6px;
  font-size: 14px;
  line-height: 1.8;
}

.page-about .tl-problem {
  color: var(--muted);
}

.page-about .tl-result {
  color: var(--text);
}

.page-about .tl-result::before {
  content: "→ ";
  color: var(--teal);
  font-family: var(--font-mono);
}

/* ---------- 团队分工（米白面板） ---------- */

.page-about .about-panel--paper {
  --line: rgba(16, 24, 32, 0.18);
  --muted: var(--about-slate);
  --text: var(--on-amber);
  background-color: var(--paper);
  color: var(--on-amber);
}

.page-about .about-panel--paper .about-body > h2,
.page-about .about-panel--paper .tl-title {
  color: var(--on-amber);
}

.page-about .about-panel--paper .about-body p {
  color: var(--on-amber);
}

.page-about .about-panel--paper .about-lead {
  color: var(--about-slate) !important;
}

.page-about .about-panel--paper .panel-num {
  color: var(--about-slate);
}

.page-about .about-panel--paper .about-side-note {
  color: var(--about-slate);
}

.page-about .about-panel--paper .about-figure {
  background-color: var(--ink);
  border-color: rgba(16, 24, 32, 0.2);
}

.page-about .about-panel--paper .media-caption {
  border-top-color: rgba(16, 24, 32, 0.18);
  color: var(--about-slate);
}

.page-about .table-scroll {
  overflow-x: auto;
  margin-top: 26px;
  border: 1px solid rgba(16, 24, 32, 0.18);
}

.page-about .roster {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.7;
}

.page-about .roster-caption {
  padding: 12px 14px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--about-slate);
}

.page-about .roster th,
.page-about .roster td {
  padding: 13px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid rgba(16, 24, 32, 0.14);
}

.page-about .roster thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.16em;
  color: var(--about-slate);
  background-color: rgba(16, 36, 56, 0.06);
  border-bottom-color: rgba(16, 24, 32, 0.24);
}

.page-about .roster tbody tr {
  transition: background-color 120ms var(--ease);
}

.page-about .roster tbody tr:hover,
.page-about .roster tbody tr:focus-within {
  background-color: rgba(16, 36, 56, 0.09);
}

.page-about .roster-name {
  position: relative;
  padding-left: 26px !important;
  font-weight: 700;
  color: var(--on-amber);
}

.page-about .roster-name::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  background: var(--about-slate);
}

.page-about .roster tbody tr:nth-child(1) .roster-name::before {
  background: var(--signal);
}

.page-about .roster tbody tr:nth-child(2) .roster-name::before {
  background: var(--teal);
}

.page-about .roster tbody tr:nth-child(3) .roster-name::before {
  background: var(--violet);
}

.page-about .roster tbody tr:nth-child(4) .roster-name::before {
  background: var(--about-slate);
}

.page-about .roster-num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--on-amber);
}

.page-about .roster tfoot th,
.page-about .roster tfoot td {
  border-bottom: none;
  background-color: rgba(16, 36, 56, 0.06);
  font-weight: 700;
  color: var(--on-amber);
}

/* ---------- 合作与收录 ---------- */

.page-about .flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
  background-color: var(--line);
  border: 1px solid var(--line);
}

.page-about .flow-step {
  background-color: var(--panel);
  padding: 20px 18px;
}

.page-about .flow-no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--signal);
}

.page-about .flow-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--text);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .fold {
  border-top: 1px solid var(--line);
  padding-top: 6px;
}

.page-about .fold-sum {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--text);
  transition: color 120ms var(--ease);
}

.page-about .fold-sum::-webkit-details-marker {
  display: none;
}

.page-about .fold-sum::before {
  content: "＋";
  color: var(--signal);
  font-size: 13px;
}

.page-about .fold[open] .fold-sum::before {
  content: "－";
}

.page-about .fold-sum:hover,
.page-about .fold-sum:focus-visible {
  color: var(--signal);
}

.page-about .fold-list {
  margin: 0 0 8px;
  padding: 0 0 0 18px;
  list-style: none;
}

.page-about .fold-list li {
  position: relative;
  padding: 9px 0 9px 16px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .fold-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 6px;
  height: 1px;
  background: var(--violet);
}

/* ---------- 复检与记录 ---------- */

.page-about .checks {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .check {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .check-k {
  align-self: start;
  padding-left: 10px;
  border-left: 2px solid var(--teal);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--teal);
}

.page-about .check p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 维护节奏 ---------- */

.page-about .cadence {
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-about .cadence-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 17px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .cadence-row dt {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--signal);
}

.page-about .cadence-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 继续浏览 ---------- */

.page-about .about-panel--end {
  background-color: var(--ink);
}

.page-about .next-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .next-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .next-link {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--text);
  text-decoration: none;
  border-left: 2px solid var(--line);
  padding-left: 10px;
  transition: color 120ms var(--ease), border-color 120ms var(--ease), transform 120ms var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  color: var(--signal);
  border-left-color: var(--signal);
  transform: translateX(4px);
}

.page-about .next-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 焦点与降级 ---------- */

.page-about a:focus-visible,
.page-about summary:focus-visible,
.page-about [tabindex="0"]:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-panel:hover {
    transform: none;
  }

  .page-about .about-panel:hover .about-side-note,
  .page-about .next-link:hover,
  .page-about .next-link:focus-visible {
    transform: none;
  }
}

/* ---------- 断点 ---------- */

@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .check {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

  .page-about .cadence-row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

  .page-about .next-item {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-h1 {
    font-size: 40px;
    line-height: 1.2;
  }

  .page-about .about-masthead-inner {
    padding-top: 34px;
    padding-bottom: 48px;
  }

  .page-about .about-panel {
    padding: 52px 0;
  }

  .page-about .about-row {
    grid-template-columns: var(--about-side-w) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-side {
    position: sticky;
    top: calc(var(--topbar) + 24px);
  }

  .page-about .about-body > h2 {
    font-size: 26px;
    margin-bottom: 24px;
  }

  .page-about .about-body p {
    font-size: 16px;
  }

  .page-about .timeline {
    padding-left: 34px;
  }

  .page-about .tl-item::before {
    left: -34px;
  }

  .page-about .timeline::before {
    left: 5px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-panel--offset .about-row {
    margin-left: 28px;
  }
}