/* ===== 品牌文化页 · 页面专属样式（作用域 .page-about） ===== */

.page-about {
  --about-pad: clamp(48px, 7.5vw, 92px);
  --about-line: rgba(138, 75, 50, 0.26);
  --about-gold-line: rgba(201, 162, 39, 0.5);
}

/* ---------- 首屏横带 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(40px, 6vw, 72px) 0 clamp(46px, 7vw, 84px);
  background: var(--surface-felt);
  color: var(--on-deep);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% -10% -10%;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(122deg, rgba(30, 42, 74, 0.96) 4%, rgba(30, 42, 74, 0.55) 42%, rgba(20, 17, 15, 0) 70%),
    radial-gradient(120% 90% at 92% 0%, rgba(242, 200, 121, 0.15), rgba(242, 200, 121, 0) 62%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 44%;
  height: 5px;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(184, 52, 42, 0) 0%, var(--ink-red) 40%, var(--ink-gold) 100%);
}

.page-about .about-hero-inner {
  position: relative;
  display: grid;
  gap: 40px;
}

.page-about .about-crumb {
  margin-bottom: clamp(24px, 3vw, 40px);
}

.page-about .about-crumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--on-deep-faint);
}

.page-about .about-crumb-list li + li::before {
  content: "/";
  margin-right: 10px;
  color: rgba(201, 162, 39, 0.65);
}

.page-about .about-crumb-list a {
  color: var(--on-deep-dim);
  text-decoration: none;
  transition: color 180ms var(--ease-out);
}

.page-about .about-crumb-list a:hover {
  color: var(--ink-butter);
}

.page-about .about-crumb-list [aria-current="page"] {
  color: var(--ink-gold);
}

.page-about .about-eyebrow {
  margin: 0;
  color: var(--ink-butter);
  letter-spacing: 0.16em;
}

.page-about .about-title {
  margin: 16px 0 24px;
  font-size: clamp(32px, 5.4vw, 64px);
  font-weight: 300;
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.page-about .about-title-line {
  display: block;
}

.page-about .about-title-line--soft {
  margin-top: 0.34em;
  font-size: 0.44em;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--ink-gold);
}

.page-about .about-hero-lead {
  margin: 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--on-deep-dim);
}

/* 竖排节点索引 */

.page-about .about-ledger {
  border-left: 1px solid var(--about-gold-line);
  padding-left: 24px;
}

.page-about .ledger-list {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ledger-item {
  position: relative;
}

.page-about .ledger-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 0.66em;
  width: 9px;
  height: 1px;
  background: var(--ink-gold);
}

.page-about .ledger-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--ink-gold);
  transition: color 220ms var(--ease-out);
}

.page-about .ledger-note {
  display: block;
  margin-top: 5px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--on-deep-faint);
  transition: color 220ms var(--ease-out);
}

@media (hover: hover) {
  .page-about .ledger-item:hover .ledger-note {
    color: var(--on-deep);
  }
  .page-about .ledger-item:hover .ledger-year {
    color: var(--ink-butter);
  }
}

/* 首段下方横带 */

.page-about .about-banner {
  margin: 0;
  background: var(--surface-felt);
  line-height: 0;
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 正文区 ---------- */

.page-about .about-body {
  background: var(--surface-paper);
  color: var(--ink-indigo);
}

.page-about .about-block {
  position: relative;
  padding: var(--about-pad) 0;
}

.page-about .about-block + .about-block {
  border-top: 1px solid var(--about-line);
}

.page-about .about-column {
  max-width: 760px;
  margin-inline: auto;
}

.page-about .about-block-head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-block-head::before {
  content: "";
  display: block;
  width: 48px;
  height: 3px;
  margin-bottom: 18px;
  background: var(--ink-clay);
}

.page-about .h2 {
  margin: 0;
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 300;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--ink-indigo);
}

.page-about .about-block p {
  max-width: 42em;
  margin: 0 0 1.1em;
  font-size: 16.5px;
  line-height: 1.85;
}

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

.page-about .about-lead {
  margin-top: 16px;
  max-width: 46em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink-indigo-soft);
}

.page-about .about-body a:not(.btn) {
  color: var(--ink-red);
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 52, 42, 0.35);
  transition: color 180ms var(--ease-out), border-color 180ms var(--ease-out);
}

.page-about .about-body a:not(.btn):hover {
  color: var(--ink-red-deep);
  border-bottom-color: var(--ink-gold);
}

/* ---------- 三个小组 ---------- */

.page-about .crew-grid {
  display: grid;
  gap: 34px;
  margin-top: clamp(30px, 4vw, 48px);
}

.page-about .crew-card {
  position: relative;
  padding: 24px 22px 22px;
  background: var(--ink-paper);
  border: 1px solid rgba(201, 162, 39, 0.55);
  box-shadow:
    7px 7px 0 -1px rgba(138, 75, 50, 0.16),
    7px 7px 0 0 rgba(138, 75, 50, 0.3),
    13px 13px 0 -3px rgba(42, 33, 28, 0.08),
    13px 13px 0 -2px rgba(138, 75, 50, 0.14);
  transition: transform 240ms var(--ease-out);
}

@media (hover: hover) {
  .page-about .crew-card:hover {
    transform: translate(-2px, -2px);
  }
}

.page-about .crew-summary {
  display: block;
  cursor: pointer;
  list-style: none;
}

.page-about .crew-summary::-webkit-details-marker {
  display: none;
}

.page-about .crew-index {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink-clay);
}

.page-about .crew-name {
  display: block;
  font-size: 21px;
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--ink-indigo);
}

.page-about .crew-tagline {
  display: block;
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-stone);
}

.page-about .crew-toggle {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ink-red);
}

.page-about .crew-toggle::after {
  content: " +";
}

.page-about .crew-card[open] .crew-toggle::after {
  content: " –";
}

.page-about .crew-duties {
  display: grid;
  gap: 12px;
  margin: 18px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid rgba(138, 75, 50, 0.24);
  list-style: none;
}

.page-about .crew-duties li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-indigo-soft);
}

.page-about .crew-duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 10px;
  height: 1px;
  background: var(--ink-gold);
}

.page-about .crew-fig {
  margin: clamp(38px, 5vw, 64px) 0 0;
}

/* ---------- 编号体系 ---------- */

.page-about .about-code-grid {
  display: grid;
  gap: 34px;
}

.page-about .about-code-text p {
  max-width: 38em;
}

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

.page-about .code-step {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  grid-template-areas:
    "level name"
    "level desc";
  gap: 4px 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .code-level {
  grid-area: level;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-clay);
}

.page-about .code-name {
  grid-area: name;
  font-size: 19px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--ink-indigo);
}

.page-about .code-desc {
  grid-area: desc;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-stone);
}

/* ---------- 更新节奏（深色段） ---------- */

.page-about .about-rhythm {
  border-top: 0;
  background: var(--surface-deep);
  color: var(--on-deep);
}

.page-about .about-rhythm .about-block-head::before {
  background: var(--ink-butter);
}

.page-about .about-rhythm .h2 {
  color: var(--on-deep);
}

.page-about .about-rhythm p {
  max-width: 40em;
  color: var(--on-deep-dim);
}

.page-about .about-rhythm a:not(.btn) {
  color: var(--ink-butter);
  border-bottom-color: rgba(242, 200, 121, 0.42);
}

.page-about .about-rhythm a:not(.btn):hover {
  color: var(--ink-paper);
  border-bottom-color: var(--ink-gold);
}

.page-about .rhythm-strip {
  display: grid;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(201, 162, 39, 0.4);
}

.page-about .rhythm-item {
  padding: 22px 0;
  border-bottom: 1px solid rgba(201, 162, 39, 0.24);
}

.page-about .rhythm-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 19px;
  letter-spacing: 0.02em;
  color: var(--ink-butter);
}

.page-about .rhythm-note {
  display: block;
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--on-deep-dim);
}

/* ---------- 数字一览 ---------- */

.page-about .numbers-grid {
  display: grid;
  gap: 34px;
}

.page-about .numbers-list {
  display: grid;
  margin: clamp(24px, 3vw, 34px) 0 clamp(22px, 3vw, 30px);
  padding: 0;
  list-style: none;
}

.page-about .numbers-item {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 4px 18px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .numbers-item:first-child {
  border-top: 1px solid var(--about-line);
}

.page-about .numbers-value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.6vw, 32px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink-red);
}

.page-about .numbers-label {
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink-indigo-soft);
}

.page-about .numbers-link {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .numbers-fig {
  margin: 0;
}

/* ---------- 图文容器 ---------- */

.page-about .fig-card {
  margin: 0;
  overflow: hidden;
  background: var(--surface-felt);
}

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

.page-about .fig-caption {
  display: block;
  padding: 12px 2px 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ink-stone);
  background: transparent;
}

/* ---------- 收尾 ---------- */

.page-about .about-close {
  padding: clamp(36px, 5vw, 58px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-close-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}

.page-about .about-close-text {
  margin: 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-indigo-soft);
}

/* ---------- 响应式 ---------- */

@media (max-width: 419px) {
  .page-about .numbers-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .page-about .code-step {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "level"
      "name"
      "desc";
    gap: 6px;
  }

  .page-about .code-level {
    padding-top: 0;
  }
}

@media (min-width: 760px) {
  .page-about .rhythm-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .rhythm-item {
    padding: 26px 24px 26px 0;
    border-bottom: 0;
  }

  .page-about .rhythm-item + .rhythm-item {
    padding-left: 26px;
    border-left: 1px solid rgba(201, 162, 39, 0.26);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(220px, 0.8fr);
    gap: 64px;
    align-items: end;
  }

  .page-about .crew-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
    align-items: start;
  }

  .page-about .crew-card:nth-child(2) {
    margin-top: 40px;
  }

  .page-about .crew-card:nth-child(3) {
    margin-top: 80px;
  }

  .page-about .about-code-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 56px;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .numbers-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 60px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .crew-card,
  .page-about .ledger-note,
  .page-about .ledger-year {
    transition: none;
  }

  .page-about .crew-card:hover {
    transform: none;
  }
}