.page-about {
  --about-brass: linear-gradient(155deg, #8A6B2E 0%, #C8A24A 38%, #E3C77E 56%, #8A6B2E 100%);
  --about-hair: rgba(200, 162, 74, .26);
  --about-card: rgba(20, 70, 58, .5);
  --about-paper-line: rgba(20, 17, 14, .13);
}

/* ---------- 通用排版 ---------- */
.page-about h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(25px, 4.6vw, 34px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  margin: 10px 0 0;
  color: var(--paper-100);
}

.page-about .about-head {
  max-width: 720px;
  margin-bottom: 34px;
}

.page-about h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.4;
  margin: 0;
}

.page-about .lede {
  color: rgba(244, 239, 228, .82);
}

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}

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

.page-about .media__frame {
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid var(--stroke);
}

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

.page-about .media__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-400);
}

/* ---------- 两栏骨架 ---------- */
.page-about .split {
  display: grid;
  gap: 30px;
}

@media (min-width: 960px) {
  .page-about .split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .split--reverse {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
  .page-about .split--rooms {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

/* ---------- 首屏 ---------- */
.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7.4vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 14px 0 0;
  color: var(--paper-100);
  text-shadow: 0 1px 0 rgba(200, 162, 74, .35);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 22px;
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 60px;
    align-items: start;
  }
}

.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 46ch;
}

.page-about .about-facts {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 16px 34px;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.page-about .about-fact__v {
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: -0.02em;
  color: var(--gold-300);
}

.page-about .about-fact__k {
  font-size: 13px;
  color: var(--mist-400);
}

/* 黄铜铭牌 */
.page-about .about-hero__plate {
  position: relative;
  padding: 28px 24px 22px;
  border: 1px solid var(--gold-line);
  border-radius: 8px;
  background:
    linear-gradient(165deg, rgba(138, 107, 46, .34), rgba(11, 43, 34, .86) 46%, rgba(200, 162, 74, .14));
  box-shadow: 0 26px 48px -30px rgba(0, 0, 0, .95), inset 0 1px 0 rgba(227, 199, 126, .34);
}

.page-about .about-plate__mark {
  display: block;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--about-brass);
  box-shadow: inset 0 0 0 3px rgba(11, 43, 34, .75), 0 6px 16px -8px rgba(0, 0, 0, .9);
}

.page-about .about-plate__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: .04em;
  color: var(--gold-300);
  margin: 16px 0 0;
  text-shadow: 0 1px 0 rgba(0, 0, 0, .5);
}

.page-about .about-plate__line {
  margin: 6px 0 0;
  font-size: 13px;
  color: var(--mist-400);
}

.page-about .about-plate__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--about-hair);
  display: grid;
  gap: 10px;
}

.page-about .about-plate__list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 14px;
  color: var(--paper-200);
}

.page-about .about-plate__list .mono {
  font-size: 12px;
  color: var(--gold-500);
}

.page-about .about-hero__banner {
  margin-top: 38px;
}

.page-about .about-hero__banner .media__frame {
  aspect-ratio: 4 / 3;
}

@media (min-width: 768px) {
  .page-about .about-hero__banner .media__frame {
    aspect-ratio: 5 / 2;
  }
}

/* ---------- 起点与定位 ---------- */
.page-about .about-origin__copy .prose p {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(244, 239, 228, .86);
}

.page-about .about-origin__copy .prose a {
  color: var(--gold-300);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-origin__aside {
  padding: 26px 22px;
  border: 1px solid var(--stroke);
  border-radius: 8px;
  background: var(--about-card);
  backdrop-filter: blur(2px);
}

.page-about .about-aside__title {
  color: var(--gold-300);
  font-size: 19px;
}

.page-about .about-aside__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-aside__list li {
  padding-top: 16px;
  border-top: 1px solid var(--about-hair);
  display: grid;
  gap: 6px;
}

.page-about .about-aside__list li:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-aside__k {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold-500);
}

.page-about .about-aside__v {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 239, 228, .8);
}

/* ---------- 内核主线 ---------- */
.page-about .kernels {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

@media (min-width: 720px) {
  .page-about .kernels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .kernels {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .kernel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px 24px;
  border: 1px solid var(--stroke);
  border-bottom: 2px solid transparent;
  border-radius: 8px;
  background: rgba(11, 43, 34, .5);
  transition: transform var(--dur) var(--ease), border-bottom-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .kernel:hover {
  transform: translateY(-6px);
  border-bottom-color: var(--gold-500);
  background: rgba(20, 70, 58, .62);
}

.page-about .kernel__num {
  font-size: 12px;
  color: var(--mist-400);
}

.page-about .kernel__ver {
  font-family: var(--font-mono);
  font-size: 27px;
  letter-spacing: -0.02em;
  color: var(--gold-300);
}

.page-about .kernel__chip {
  align-self: flex-start;
  font-size: 12px;
}

.page-about .kernel__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 239, 228, .78);
}

.page-about .kernel-notes {
  margin-top: 30px;
  display: grid;
  gap: 14px;
  padding-top: 24px;
  border-top: 1px solid var(--about-hair);
}

@media (min-width: 860px) {
  .page-about .kernel-notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
  }
}

.page-about .kernel-notes__item {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 239, 228, .78);
}

.page-about .kernel-notes__item .mono {
  display: block;
  font-size: 17px;
  color: var(--gold-300);
  margin-bottom: 4px;
}

.page-about .kernel-notes__item a {
  color: var(--gold-300);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 房间体系 ---------- */
.page-about .rooms {
  display: grid;
  gap: 18px;
}

@media (min-width: 900px) {
  .page-about .rooms {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    align-items: start;
  }
}

.page-about .room-card {
  position: relative;
  padding: 24px 22px 22px;
  border: 1px solid var(--stroke);
  border-radius: 8px;
  color: var(--paper-100);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .room-card:focus-visible {
  outline: 2px solid var(--gold-500);
  outline-offset: 3px;
}

.page-about .room-card--leisure {
  background: linear-gradient(170deg, #1E5F4E 0%, #14463A 82%);
}

.page-about .room-card--standard {
  background: linear-gradient(170deg, #174F41 0%, #0F3A2F 82%);
}

.page-about .room-card--season {
  background: linear-gradient(170deg, #14463A 0%, #0B2B22 82%);
  border-color: rgba(142, 36, 52, .6);
}

@media (min-width: 900px) {
  .page-about .room-card:hover,
  .page-about .room-card:focus {
    transform: translateY(-6px);
    box-shadow: var(--shadow-card);
  }
}

.page-about .room-card__name {
  font-size: 22px;
  color: var(--paper-100);
}

.page-about .room-card__tagline {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 239, 228, .74);
}

.page-about .room-card__params {
  margin: 18px 0 0;
  display: grid;
  gap: 9px;
}

.page-about .room-card__row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding-top: 9px;
  border-top: 1px solid var(--about-hair);
}

.page-about .room-card__row dt {
  font-size: 13px;
  color: var(--mist-400);
}

.page-about .room-card__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gold-300);
  letter-spacing: -0.01em;
}

.page-about .room-card__flag {
  position: absolute;
  top: 18px;
  right: 16px;
  font-size: 11px;
}

@media (min-width: 900px) {
  .page-about .room-card__params {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    overflow: hidden;
    transition: max-height 320ms var(--ease), opacity 240ms var(--ease), margin-top 320ms var(--ease);
  }
  .page-about .room-card:hover .room-card__params,
  .page-about .room-card:focus .room-card__params,
  .page-about .room-card:focus-within .room-card__params {
    max-height: 240px;
    opacity: 1;
    margin-top: 18px;
  }
}

.page-about .about-rooms__foot {
  margin-top: 40px;
}

.page-about .about-rooms__media {
  margin: 0;
}

.page-about .about-rooms__media .media__frame {
  aspect-ratio: 4 / 3;
}

.page-about .about-tips__title {
  color: var(--gold-300);
  font-size: 20px;
}

.page-about .about-tips__text {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 239, 228, .8);
}

/* ---------- 服务与支持 ---------- */
.page-about .about-support__groups {
  display: grid;
}

.page-about .support-row {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .support-row:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .support-row__num {
  font-size: 15px;
  color: var(--gold-500);
  padding-top: 4px;
}

.page-about .support-row__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--paper-100);
}

.page-about .support-row__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 239, 228, .78);
}

.page-about .about-support__channels {
  padding: 26px 22px;
  border: 1px solid var(--stroke);
  border-radius: 8px;
  background: var(--about-card);
}

.page-about .about-channels__title {
  color: var(--gold-300);
  font-size: 19px;
}

.page-about .about-channels__text {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 239, 228, .8);
}

.page-about .about-channels__text a {
  color: var(--gold-300);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-channels__hours {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-hair);
  font-size: 13px;
  color: var(--mist-400);
}

.page-about .about-support__media {
  margin-top: 42px;
  max-width: 820px;
}

.page-about .about-support__media .media__frame {
  aspect-ratio: 16 / 9;
}

/* ---------- 暖纸区 ---------- */
.page-about .section--paper {
  color: var(--text-900);
}

.page-about .section--paper h2 {
  color: var(--text-900);
}

.page-about .section--paper .eyebrow {
  color: var(--brass-700);
}

.page-about .section--paper .lede {
  color: rgba(20, 17, 14, .74);
}

/* ---------- 里程碑 ---------- */
.page-about .milestone {
  list-style: none;
  margin: 0 0 0 -18px;
  padding: 0 0 12px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  padding-left: 18px;
  padding-right: 18px;
}

.page-about .milestone::-webkit-scrollbar {
  height: 6px;
}

.page-about .milestone::-webkit-scrollbar-track {
  background: rgba(20, 17, 14, .08);
  border-radius: 3px;
}

.page-about .milestone::-webkit-scrollbar-thumb {
  background: var(--about-paper-line);
  border-radius: 3px;
}

.page-about .milestone__item {
  position: relative;
  flex: 0 0 80%;
  min-width: 0;
  scroll-snap-align: start;
  display: flex;
}

.page-about .milestone__item::before {
  content: "";
  position: absolute;
  top: 24px;
  left: 0;
  right: -14px;
  height: 1px;
  background: rgba(138, 107, 46, .34);
}

.page-about .milestone__item:last-child::before {
  right: 0;
}

.page-about .milestone__item--major::before {
  top: 27px;
}

@media (min-width: 720px) {
  .page-about .milestone__item {
    flex: 0 0 300px;
  }
}

@media (min-width: 1200px) {
  .page-about .milestone__item {
    flex: 0 0 258px;
  }
}

.page-about .milestone__node {
  width: 100%;
  background: var(--paper-200);
  border: 1px solid var(--about-paper-line);
  border-radius: 8px;
  padding: 16px 16px 14px;
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .milestone__node:hover {
  box-shadow: 0 16px 30px -22px rgba(0, 0, 0, .7);
}

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

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

.page-about .milestone__summary::marker {
  content: "";
}

.page-about .milestone__dot {
  display: block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--paper-100);
  border: 3px solid var(--gold-500);
  box-shadow: 0 0 0 5px rgba(200, 162, 74, .18);
  position: relative;
  z-index: 1;
  margin-bottom: 14px;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .milestone__item--major .milestone__dot {
  width: 20px;
  height: 20px;
  margin-bottom: 11px;
}

.page-about .milestone__summary:hover .milestone__dot,
.page-about .milestone__node[open] .milestone__dot {
  background: var(--gold-500);
  transform: scale(1.08);
}

.page-about .milestone__title {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.45;
  color: var(--text-900);
}

.page-about .milestone__tag {
  display: inline-block;
  margin-top: 8px;
  font-size: 12px;
  color: var(--brass-700);
  border: 1px solid var(--about-paper-line);
  border-radius: 999px;
  padding: 3px 10px;
}

.page-about .milestone__body {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--about-paper-line);
  font-size: 14px;
  line-height: 1.78;
  color: rgba(20, 17, 14, .78);
}

/* ---------- 规模数据 ---------- */
.page-about .metrics {
  list-style: none;
  margin: 0;
  padding: 0;
}

@media (min-width: 940px) {
  .page-about .metrics {
    column-count: 2;
    column-gap: 64px;
  }
  .page-about .metric {
    break-inside: avoid;
  }
}

.page-about .metric {
  display: grid;
  gap: 5px;
  padding: 22px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .metric__value {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5.4vw, 44px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gold-300);
}

.page-about .metric__unit {
  font-size: .48em;
  margin-left: 5px;
  color: var(--gold-500);
}

.page-about .metric__label {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper-100);
}

.page-about .metric__note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-400);
}

@media (min-width: 640px) {
  .page-about .metric {
    grid-template-columns: minmax(130px, 210px) minmax(0, 1fr);
    column-gap: 26px;
    align-items: baseline;
  }
  .page-about .metric__value {
    grid-row: span 2;
  }
}

/* ---------- 下一步 ---------- */
.page-about .about-next .next-step {
  margin-top: 0;
}

@media (min-width: 960px) {
  .page-about .milelist,
  .page-about .about-next .next-step {
    max-width: 880px;
  }
}