/* =========================================================
   品牌档案 · page-about
   ========================================================= */

.page-about {
  --ab-max: 1160px;
  --ab-line: rgba(107, 111, 108, .34);
  --ab-line-gold: rgba(201, 162, 39, .42);
  --ab-line-light: rgba(243, 237, 227, .16);
  --ab-soft: rgba(26, 26, 24, .62);
  --ab-rhythm: clamp(54px, 8vw, 116px);
  padding-inline: var(--shell-x);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-about p {
  margin: 0 0 1.05em;
}

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

.page-about ::selection {
  background: var(--gold);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */

.page-about .breadcrumb {
  max-width: var(--ab-max);
  margin-inline: auto;
  padding-top: clamp(20px, 3.4vw, 40px);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--ab-soft);
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 6px;
  color: var(--ab-line);
}

.page-about .breadcrumb__item a {
  color: var(--red);
  text-decoration: none;
  border-bottom: 1px solid rgba(158, 43, 43, .32);
}

.page-about .breadcrumb__item a:hover,
.page-about .breadcrumb__item a:focus-visible {
  color: var(--red-deep);
  border-color: var(--red-deep);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  max-width: var(--ab-max);
  margin-inline: auto;
  padding-block: clamp(30px, 6vw, 66px) clamp(50px, 8vw, 108px);
}

.page-about .about-hero__bg {
  position: absolute;
  top: -6%;
  right: -4%;
  bottom: auto;
  left: -4%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(130% 84% at 88% 2%, rgba(201, 162, 39, .17), transparent 62%),
    radial-gradient(104% 76% at 2% 98%, rgba(31, 59, 51, .15), transparent 66%),
    repeating-linear-gradient(114deg, rgba(20, 38, 59, .05) 0 2px, transparent 2px 12px);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(30px, 4.4vw, 52px);
}

.page-about .about-hero__kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .16em;
  color: var(--gold-deep);
}

.page-about .about-hero__idx {
  padding: 3px 8px;
  border: 1px solid var(--ab-line-gold);
  font-weight: 700;
  letter-spacing: .1em;
}

.page-about .about-hero__dash {
  width: 34px;
  height: 1px;
  background: var(--ab-line-gold);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.05rem, 6.2vw, 4.3rem);
  line-height: 1.16;
  letter-spacing: .01em;
  color: #2a2312;
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .page-about .about-hero__title {
    background-image: linear-gradient(168deg, #241d0f 0%, var(--ink) 42%, var(--gold-deep) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }
}

.page-about .about-hero__lede {
  max-width: 36em;
  margin-top: clamp(18px, 2.6vw, 28px);
  font-size: 1.05rem;
  line-height: 1.88;
  color: var(--ab-soft);
}

.page-about .about-hero__tags {
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-hero__card {
  padding: clamp(20px, 2.8vw, 32px);
  border: 1px solid var(--ab-line);
  border-radius: 0;
}

.page-about .about-hero__card-title {
  margin: 0 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ab-line-gold);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .2em;
  color: var(--red);
}

.page-about .about-hero__facts {
  display: grid;
  margin: 0;
}

.page-about .about-hero__facts > div {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(107, 111, 108, .3);
}

.page-about .about-hero__facts > div:first-child {
  padding-top: 0;
}

.page-about .about-hero__facts > div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-hero__facts dt {
  font-size: .86rem;
  color: var(--ab-soft);
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  max-width: var(--ab-max);
  margin-inline: auto;
  padding-block: var(--ab-rhythm);
  border-top: 1px solid var(--ab-line);
}

.page-about .exhibit {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .exhibit__index {
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--gold-deep);
}

.page-about .exhibit__rule {
  display: inline-block;
  width: clamp(28px, 5vw, 56px);
  height: 1px;
  background: var(--ab-line-gold);
}

.page-about .exhibit__title {
  flex: 0 1 auto;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.1vw, 2.35rem);
  line-height: 1.3;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .about-intro {
  max-width: 40em;
  margin: 0 0 clamp(28px, 4vw, 46px);
  font-size: 1rem;
  color: var(--ab-soft);
}

/* ---------- 01 站点由来 ---------- */

.page-about .about-split {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-lead {
  margin-bottom: 1.4em;
  padding-left: 18px;
  border-left: 2px solid var(--gold);
  font-family: var(--font-display);
  font-size: clamp(1.14rem, 2.1vw, 1.42rem);
  line-height: 1.72;
  color: var(--ink);
}

.page-about .about-split__aside {
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--ab-line);
  border-top: 3px solid var(--red);
  border-radius: 0;
}

.page-about .about-aside__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.page-about .about-aside__list {
  display: grid;
  gap: 10px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.page-about .about-aside__list li {
  position: relative;
  padding-left: 20px;
  font-size: .93rem;
  line-height: 1.72;
  color: var(--ab-soft);
}

.page-about .about-aside__list li::before {
  content: "";
  position: absolute;
  top: .62em;
  left: 0;
  width: 9px;
  height: 9px;
  border: 1px solid var(--gold);
  border-radius: 50%;
}

.page-about .about-aside__foot {
  margin: 0;
  padding-top: 16px;
  border-top: 1px dashed rgba(107, 111, 108, .3);
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 02 口径体系三件套 ---------- */

.page-about .about-trio {
  display: grid;
  gap: clamp(20px, 2.6vw, 30px);
  align-items: start;
}

.page-about .about-trio__item {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(22px, 2.8vw, 34px);
  border: 1px solid var(--ab-line);
  border-radius: 0;
}

.page-about .about-trio__no {
  margin: 0;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--ab-line-gold);
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .18em;
  color: var(--gold-deep);
}

.page-about .about-trio__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.4vw, 1.5rem);
  font-weight: 700;
  line-height: 1.36;
}

.page-about .about-trio__desc {
  margin: 0;
  font-size: .95rem;
  line-height: 1.82;
  color: var(--ab-soft);
}

.page-about .about-trio__meta {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-top: 14px;
  border-top: 1px dashed rgba(107, 111, 108, .3);
}

.page-about .about-trio__meta > div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: .8rem;
}

.page-about .about-trio__meta dt {
  color: var(--stone);
  letter-spacing: .02em;
}

.page-about .about-trio__meta dd {
  margin: 0;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-trio__link {
  align-self: flex-start;
  margin-top: auto;
  padding-bottom: 3px;
  border-bottom: 1px solid rgba(158, 43, 43, .38);
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .04em;
  color: var(--red);
  text-decoration: none;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-trio__link:hover,
.page-about .about-trio__link:focus-visible {
  color: var(--red-deep);
  border-color: var(--red-deep);
}

/* ---------- 03 周期沿革（深色） ---------- */

.page-about .about-section--night {
  max-width: var(--ab-max);
  padding-inline: clamp(22px, 4vw, 64px);
  border-top: 0;
  background:
    radial-gradient(90% 70% at 88% 6%, rgba(201, 162, 39, .13), transparent 62%),
    linear-gradient(158deg, #14263b 0%, #0f1f31 54%, #1f3b33 100%);
  color: var(--rice);
  box-shadow: var(--shadow-paper);
}

.page-about .exhibit--light .exhibit__index {
  color: var(--gold);
}

.page-about .exhibit--light .exhibit__rule {
  background: rgba(201, 162, 39, .5);
}

.page-about .exhibit--light .exhibit__title {
  color: var(--rice);
}

.page-about .about-intro--light {
  color: rgba(243, 237, 227, .74);
}

.page-about .about-steps {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 34px);
  padding-block: clamp(18px, 2.6vw, 30px);
  border-top: 1px solid var(--ab-line-light);
}

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

.page-about .about-steps__no {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border: 1px solid rgba(201, 162, 39, .55);
  border-radius: 50%;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gold);
}

.page-about .about-steps__name {
  margin: 0 0 .55em;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.2vw, 1.38rem);
  font-weight: 700;
  line-height: 1.45;
  color: var(--rice);
}

.page-about .about-steps__body p {
  max-width: 40em;
  margin: 0;
  font-size: .96rem;
  line-height: 1.85;
  color: rgba(243, 237, 227, .76);
}

/* ---------- 04 版本时间线 ---------- */

.page-about .media-frame {
  margin: 0;
}

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

.page-about .media-frame__cap {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .04em;
  line-height: 1.72;
  color: var(--stone);
}

.page-about .about-band-figure {
  margin-bottom: clamp(34px, 5vw, 58px);
}

.page-about .about-version-grid {
  display: grid;
  gap: clamp(30px, 4vw, 52px);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 40px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 15px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(201, 162, 39, .45) 42%, rgba(107, 111, 108, .26) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(14px, 2vw, 20px);
}

.page-about .about-timeline__dot {
  position: absolute;
  top: 22px;
  left: -29px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--gold);
  border-radius: 50%;
  background: var(--paper);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, .12);
}

.page-about .about-ver {
  border: 1px solid var(--ab-line);
  background: var(--paper);
  transition: border-color .28s var(--ease), box-shadow .28s var(--ease);
}

.page-about .about-ver[open] {
  border-color: var(--ab-line-gold);
  box-shadow: var(--shadow-paper);
}

.page-about .about-ver__head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: clamp(14px, 1.8vw, 20px) clamp(16px, 2vw, 24px);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-ver__no {
  flex: none;
  padding: 3px 7px;
  border: 1px solid var(--ab-line-gold);
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--gold-deep);
}

.page-about .about-ver__name {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-size: clamp(.98rem, 1.8vw, 1.14rem);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .about-ver__mark {
  position: relative;
  flex: none;
  width: 12px;
  height: 12px;
}

.page-about .about-ver__mark::before,
.page-about .about-ver__mark::after {
  content: "";
  position: absolute;
  background: var(--gold-deep);
  transition: transform .28s var(--ease), opacity .28s var(--ease);
}

.page-about .about-ver__mark::before {
  top: 5px;
  left: 0;
  width: 12px;
  height: 1px;
}

.page-about .about-ver__mark::after {
  top: 0;
  left: 5px;
  width: 1px;
  height: 12px;
}

.page-about .about-ver[open] .about-ver__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .about-ver__body {
  margin: 0 clamp(16px, 2vw, 24px);
  padding: clamp(14px, 1.8vw, 20px) 0 clamp(18px, 2.2vw, 24px);
  border-top: 1px dashed rgba(107, 111, 108, .32);
  font-size: .94rem;
  line-height: 1.84;
  color: var(--ab-soft);
}

.page-about .about-ver__meta {
  display: grid;
  gap: 8px;
  margin: 14px 0 0;
}

.page-about .about-ver__meta > div {
  display: flex;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: .79rem;
}

.page-about .about-ver__meta dt {
  flex: none;
  min-width: 5.4em;
  color: var(--stone);
  letter-spacing: .04em;
}

.page-about .about-ver__meta dd {
  margin: 0;
  color: var(--ink);
}

.page-about .about-version-aside {
  margin: 0;
}

.page-about .about-version-aside__note {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px dashed rgba(107, 111, 108, .3);
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 05 维护分工 ---------- */

.page-about .about-upkeep {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-upkeep__body > p {
  max-width: 40em;
  color: var(--ab-soft);
}

.page-about .about-roles {
  display: grid;
  gap: 1px;
  margin: clamp(22px, 3vw, 32px) 0;
  border: 1px solid var(--ab-line);
  background: var(--ab-line);
}

.page-about .about-role {
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--rice);
  transition: background-color .3s var(--ease);
}

.page-about .about-role:hover {
  background: var(--paper);
}

.page-about .about-role__name {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--red);
}

.page-about .about-role__count {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-role__num {
  font-variant-numeric: tabular-nums;
}

.page-about .about-role__note {
  margin: 0;
  font-size: .84rem;
  line-height: 1.76;
  color: var(--ab-soft);
  opacity: .74;
  transition: opacity .3s var(--ease);
}

.page-about .about-role:hover .about-role__note {
  opacity: 1;
}

.page-about .about-cadence {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: clamp(18px, 2.4vw, 26px) 0 0;
  border-top: 1px dashed rgba(107, 111, 108, .32);
  list-style: none;
}

.page-about .about-cadence li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-size: .94rem;
  color: var(--ab-soft);
}

.page-about .about-cadence span {
  flex: none;
  min-width: 4.6em;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--gold-deep);
}

/* ---------- 06 备案注脚 ---------- */

.page-about .about-section--colophon {
  border-top: 1px solid var(--ab-line);
}

.page-about .about-colophon {
  max-width: 64em;
}

.page-about .about-colophon__facts {
  display: grid;
  margin: 0 0 clamp(22px, 3vw, 32px);
}

.page-about .about-colophon__facts > div {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 18px;
  padding: 12px 0;
  border-bottom: 1px solid var(--ab-line);
  font-family: var(--font-mono);
  font-size: .82rem;
}

.page-about .about-colophon__facts dt {
  flex: none;
  color: var(--stone);
  letter-spacing: .04em;
}

.page-about .about-colophon__facts dd {
  margin: 0;
  text-align: right;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.page-about .about-colophon__note {
  font-size: .9rem;
  line-height: 1.82;
  color: var(--ab-soft);
}

.page-about .about-colophon__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
}

.page-about .about-colophon__links a {
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(158, 43, 43, .35);
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .03em;
  color: var(--red);
  text-decoration: none;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-colophon__links a:hover,
.page-about .about-colophon__links a:focus-visible {
  color: var(--red-deep);
  border-color: var(--red-deep);
}

/* ---------- 响应式 ---------- */

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

  .page-about .about-colophon__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-colophon__facts > div:nth-last-child(-n+2) {
    border-bottom: 1px solid var(--ab-line);
  }
}

@media (min-width: 860px) {
  .page-about .about-trio {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    padding-bottom: 46px;
  }

  .page-about .about-trio__item:nth-child(2) {
    margin-top: 24px;
  }

  .page-about .about-trio__item:nth-child(3) {
    margin-top: 48px;
  }

  .page-about .about-trio__item:nth-child(1) {
    border-top: 3px solid var(--gold);
  }

  .page-about .about-trio__item:nth-child(2) {
    border-top: 3px solid var(--moss-soft);
  }

  .page-about .about-trio__item:nth-child(3) {
    border-top: 3px solid var(--red);
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3.4fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-upkeep {
    grid-template-columns: minmax(0, 4.2fr) minmax(0, 6.4fr);
    gap: clamp(36px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-upkeep__figure {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
}

@media (min-width: 960px) {
  .page-about .about-version-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 80px);
    align-items: start;
  }

  .page-about .about-version-aside {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 6.2fr) minmax(0, 3.4fr);
    align-items: end;
  }

  .page-about .about-hero__title {
    letter-spacing: -.005em;
  }
}

@media (min-width: 1280px) {
  .page-about {
    padding-inline: calc(var(--shell-x) + 12px);
  }
}

@media (max-width: 420px) {
  .page-about .about-hero__title {
    font-size: 1.86rem;
  }

  .page-about .exhibit__title {
    font-size: 1.34rem;
  }

  .page-about .about-steps__no {
    width: 44px;
    height: 44px;
    font-size: 1rem;
  }

  .page-about .about-ver__head {
    gap: 10px;
  }
}