/* ============================================================
   page-about · 品牌价值
   作用域：.page-about
   ============================================================ */

.page-about {
  --ab-line: rgba(30, 62, 89, 0.55);
  --ab-line-cream: rgba(36, 31, 27, 0.16);
  --ab-pad: clamp(22px, 4.4vw, 54px);
  --ab-gap: clamp(22px, 3.4vw, 44px);
  display: block;
  background-color: var(--ink-900);
  color: var(--cream);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 通用文字层级（页面内） ---------- */

.page-about .ab-kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--green);
}

.page-about .ab-tag {
  flex: none;
  display: inline-block;
  padding: 4px 9px;
  border: 1px solid var(--ink-500);
  background: var(--ink-900);
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1.4;
}

.page-about .ab-tag--green {
  background: var(--green);
  border-color: var(--green);
  color: var(--ink-900);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background-color: var(--ink-900);
  background-image: var(--blueprint);
  border-bottom: var(--hairline);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  top: -90px;
  right: -70px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: var(--orange);
  opacity: 0.07;
  pointer-events: none;
}

.page-about .ab-crumb {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: clamp(18px, 2.6vw, 28px);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .ab-crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .ab-crumb a:hover,
.page-about .ab-crumb a:focus-visible {
  color: var(--green);
  border-bottom-color: var(--green);
}

.page-about .ab-crumb [aria-current="page"] {
  color: var(--cream);
}

.page-about .ab-crumb__sep {
  color: var(--ink-500);
}

.page-about .ab-hero__grid {
  position: relative;
  z-index: 2;
  display: grid;
  gap: clamp(26px, 4.5vw, 48px);
  align-items: center;
  padding-top: clamp(26px, 4.6vw, 52px);
  padding-bottom: clamp(26px, 4.2vw, 46px);
}

.page-about .ab-hero h1 {
  margin: 0 0 20px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2rem, 7.4vw, 4.2rem);
  line-height: 1.07;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .ab-hero__lead {
  margin: 0 0 26px;
  max-width: 46ch;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero__visual {
  position: relative;
  border: var(--hairline);
  background: var(--ink-700);
}

.page-about .ab-hero__visual::before {
  content: "SEAT / 01";
  position: absolute;
  top: 10px;
  left: 12px;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--green);
  opacity: 0.85;
}

.page-about .ab-hero__visual svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-hero__facts {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--ink-500);
  border-top: var(--hairline);
  border-bottom: var(--hairline);
}

.page-about .ab-fact {
  background: var(--ink-900);
  padding: 16px 16px 18px;
  min-width: 0;
}

.page-about .ab-fact dt {
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .ab-fact dd {
  margin: 0;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

/* ---------- 总布局：索引轨 + 内容流 ---------- */

.page-about .ab-layout {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  padding-top: clamp(32px, 5.5vw, 68px);
  padding-bottom: clamp(36px, 6vw, 80px);
}

.page-about .ab-rail {
  min-width: 0;
}

.page-about .ab-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 12px;
  border: 1px solid var(--ink-500);
  background: var(--ink-700);
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  font-size: 12.5px;
  letter-spacing: 0.02em;
  transition: color var(--ease), background var(--ease), border-color var(--ease);
}

.page-about .ab-rail__num {
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--mist);
  transition: color var(--ease);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--ink-900);
  background: var(--green);
  border-color: var(--green);
}

.page-about .ab-rail__link[data-active="true"] {
  color: var(--ink-900);
  background: var(--green);
  border-color: var(--green);
}

.page-about .ab-rail__link:hover .ab-rail__num,
.page-about .ab-rail__link:focus-visible .ab-rail__num,
.page-about .ab-rail__link[data-active="true"] .ab-rail__num {
  color: var(--ink-900);
}

.page-about .ab-stream {
  display: flex;
  flex-direction: column;
  gap: clamp(24px, 4vw, 52px);
  min-width: 0;
}

/* ---------- 面板 ---------- */

.page-about .ab-panel {
  position: relative;
  min-width: 0;
  padding: var(--ab-pad);
  border: var(--hairline);
}

.page-about .ab-panel--cream {
  background: var(--cream);
  color: var(--ink-text);
}

.page-about .ab-panel--cream::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(36, 31, 27, 0.9) 1px, transparent 1px);
  background-size: 16px 16px;
  opacity: 0.05;
}

.page-about .ab-panel--cream > * {
  position: relative;
  z-index: 1;
}

.page-about .ab-panel--ink {
  background: var(--ink-700);
  color: var(--cream);
}

.page-about .ab-panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about .ab-panel__head h2 {
  flex: 1 1 260px;
  min-width: 0;
}

.page-about .ab-panel h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.45rem, 3.5vw, 2.25rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .ab-panel--cream h2 {
  color: var(--ink-900);
}

.page-about .ab-panel--ink h2 {
  color: var(--cream);
}

.page-about .ab-panel__lead {
  flex: 1 1 100%;
  margin: 2px 0 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.85;
}

.page-about .ab-panel--ink .ab-panel__lead {
  color: var(--mist);
}

.page-about .ab-panel--cream .ab-panel__lead {
  color: rgba(36, 31, 27, 0.74);
}

/* ---------- 两栏错位 ---------- */

.page-about .ab-grid2 {
  display: grid;
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .ab-prose p {
  margin: 0 0 16px;
  max-width: 44ch;
  font-size: 15.5px;
  line-height: 1.9;
}

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

.page-about .ab-panel--cream .ab-prose p {
  color: rgba(36, 31, 27, 0.88);
}

.page-about .ab-panel--ink .ab-prose p {
  color: rgba(246, 241, 231, 0.86);
}

.page-about .ab-prose--wide {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--ab-line-cream);
}

.page-about .ab-prose--wide p {
  max-width: 62ch;
}

.page-about .ab-points {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-points li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .ab-points li::before {
  content: "";
  position: absolute;
  top: 0.62em;
  left: 0;
  width: 7px;
  height: 7px;
  background: var(--orange);
}

.page-about .ab-panel--ink .ab-points li {
  color: rgba(246, 241, 231, 0.84);
}

.page-about .ab-points .num {
  font-weight: 700;
  font-size: 1.12em;
  color: var(--orange-ink);
}

.page-about .ab-panel--ink .ab-points .num {
  color: var(--amber);
}

/* ---------- 图 ---------- */

.page-about .ab-figure {
  margin: 0;
  border: 1px solid var(--ink-500);
  background: var(--ink-900);
  overflow: hidden;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .ab-figure--tall img {
  aspect-ratio: 3 / 2;
}

.page-about .ab-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--ink-500);
  background: var(--ink-900);
  color: var(--mist);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  line-height: 1.6;
}

/* ---------- 时间轴 ---------- */

.page-about .ab-tl-layout {
  display: grid;
  gap: var(--ab-gap);
  margin-top: 26px;
  align-items: start;
}

.page-about .ab-tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 5px;
  width: 1px;
  background: var(--ink-500);
}

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 30px 26px;
}

.page-about .ab-tl__item:last-child {
  padding-bottom: 0;
}

.page-about .ab-tl__marker {
  position: absolute;
  top: 5px;
  left: 0;
  width: 11px;
  height: 11px;
  border: 1px solid var(--green);
  background: var(--ink-900);
  transform: rotate(45deg);
}

.page-about .ab-tl__year {
  margin: 0 0 6px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.page-about .ab-tl__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.02rem, 2.1vw, 1.28rem);
  line-height: 1.42;
  color: var(--cream);
}

.page-about .ab-tl__item p {
  margin: 0;
  max-width: 54ch;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .ab-tl__visual {
  margin: 0;
  border: 1px solid var(--ink-500);
  background: var(--ink-900);
}

.page-about .ab-tl__visual img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 260px;
  object-fit: cover;
}

/* ---------- 团队 ---------- */

.page-about .ab-team {
  display: grid;
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .ab-team__stats {
  display: grid;
  gap: 1px;
  border: 1px solid var(--ab-line-cream);
  background: var(--ab-line-cream);
}

.page-about .ab-stat {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 16px;
  align-items: start;
  padding: 15px 16px;
  background: var(--cream);
}

.page-about .ab-stat__num {
  font-size: clamp(1.6rem, 4.4vw, 2.15rem);
  font-weight: 700;
  line-height: 1;
  color: var(--ink-900);
  letter-spacing: -0.02em;
}

.page-about .ab-stat__label {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--orange-ink);
}

.page-about .ab-stat__desc {
  display: block;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(36, 31, 27, 0.76);
}

/* ---------- 协作记分板 ---------- */

.page-about .ab-board {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ink-500);
}

.page-about .ab-board__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 18px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid var(--ink-500);
}

.page-about .ab-board__num {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--green);
}

.page-about .ab-board__num em {
  font-style: normal;
  font-size: 0.36em;
  font-weight: 500;
  letter-spacing: 0.1em;
  margin-left: 0.3em;
  color: var(--mist);
}

.page-about .ab-board__body {
  min-width: 0;
}

.page-about .ab-board__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.02rem;
  line-height: 1.45;
  color: var(--cream);
}

.page-about .ab-board__body p {
  margin: 0;
  max-width: 50ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 手风琴（内容准则） ---------- */

.page-about .ab-acc {
  margin-top: 24px;
  border-top: 1px solid var(--ab-line-cream);
}

.page-about .ab-acc__item {
  border-bottom: 1px solid var(--ab-line-cream);
}

.page-about .ab-acc__head {
  margin: 0;
  font-weight: inherit;
}

.page-about .ab-acc__trigger {
  display: flex;
  align-items: baseline;
  gap: 14px;
  width: 100%;
  padding: 17px 2px;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1rem, 2.1vw, 1.16rem);
  line-height: 1.45;
  color: var(--ink-900);
}

.page-about .ab-acc__trigger::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--orange);
}

.page-about .accordion__item[data-open="true"] .ab-acc__trigger::after,
.page-about .ab-acc__trigger[data-open="true"]::after {
  content: "−";
}

.page-about .ab-acc__index {
  flex: none;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--orange-ink);
}

.page-about .accordion__panel,
.page-about .ab-acc__panel {
  display: block;
}

.page-about .accordion__item[data-open="false"] .ab-acc__panel,
.page-about .ab-acc__trigger[data-open="false"] + .ab-acc__panel {
  display: none;
}

.page-about .ab-acc__panel {
  padding: 0 2px 20px;
}

.page-about .ab-acc__panel p {
  margin: 0 0 10px;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.86;
  color: rgba(36, 31, 27, 0.82);
}

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

/* ---------- 结尾引导 ---------- */

.page-about .ab-cta {
  position: relative;
  overflow: hidden;
  padding: var(--ab-pad);
  border: var(--hairline);
  background-color: var(--ink-700);
  background-image: var(--blueprint);
}

.page-about .ab-cta::before {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -60px;
  width: 160px;
  height: 160px;
  background: var(--green);
  opacity: 0.1;
  transform: rotate(18deg);
  pointer-events: none;
}

.page-about .ab-cta h2 {
  position: relative;
  margin: 0 0 12px;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.35rem, 3.2vw, 1.95rem);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .ab-cta p {
  position: relative;
  margin: 0 0 22px;
  max-width: 54ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .ab-cta__links {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */

@media (min-width: 620px) {
  .page-about .ab-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-board__row {
    grid-template-columns: auto minmax(0, 1fr);
    padding: 22px 0;
  }
}

@media (min-width: 860px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  }

  .page-about .ab-grid2 {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .page-about .ab-tl-layout {
    grid-template-columns: minmax(0, 1fr) 220px;
  }

  .page-about .ab-tl__visual {
    position: sticky;
    top: 104px;
  }

  .page-about .ab-tl__visual img {
    max-height: 420px;
  }

  .page-about .ab-board__row:nth-child(odd) {
    padding-right: 7%;
  }

  .page-about .ab-board__row:nth-child(even) {
    padding-left: 7%;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-layout {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    align-items: start;
    gap: clamp(24px, 3vw, 40px);
  }

  .page-about .ab-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 6px;
    padding: 0;
    overflow: visible;
  }

  .page-about .ab-rail__link {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
    padding: 10px 10px 11px;
  }

  .page-about .ab-rail__label {
    font-size: 12px;
    letter-spacing: 0.08em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}