/* ===== 品牌故事 / page-about ===== */
.page-about {
  --about-line: 1px solid var(--edge);
  --about-rail: 92px;
  color: var(--paper);
  padding-bottom: clamp(56px, 8vw, 120px);
  overflow-wrap: break-word;
}

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* --- 首屏 --- */
.page-about .about-hero {
  padding-top: clamp(20px, 3.6vw, 44px);
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-hero__kicker::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 255, 61, 0.14);
}

.page-about .about-hero__title {
  margin: clamp(16px, 2.4vw, 28px) 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(2.05rem, 7vw, 4.6rem);
  line-height: 1.07;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .about-hero__title span {
  display: block;
}

.page-about .about-hero__title em {
  font-style: normal;
  font-weight: 300;
  color: var(--lime);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.6vw, 32px) 0 0;
  max-width: 62ch;
  font-size: clamp(14.5px, 1.15vw, 17px);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(26px, 4vw, 50px);
  background-color: var(--edge);
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 4px 18px;
  background-color: var(--ink-900);
}

.page-about .about-hero__stat-num {
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 500;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-hero__stat-num.is-orange {
  color: var(--orange);
}

.page-about .about-hero__stat-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

/* --- 图片 --- */
.page-about .about-figure {
  margin: 0;
}

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

.page-about .about-figure__cap {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-about .about-figure--hero {
  margin-top: clamp(30px, 5vw, 64px);
}

.page-about .about-figure--hero img {
  aspect-ratio: 2 / 1;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 38px));
}

/* --- 章节通用 --- */
.page-about .about-chapter,
.page-about .about-timeline,
.page-about .about-method,
.page-about .about-rules,
.page-about .about-next {
  margin-top: clamp(56px, 8vw, 118px);
}

.page-about .about-chapter__head {
  max-width: 780px;
}

.page-about .about-chapter__head .label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-chapter__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.45rem, 3.4vw, 2.5rem);
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-chapter__lede {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: clamp(14.5px, 1.05vw, 16px);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-chapter__body p {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: clamp(14.5px, 1.05vw, 16px);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-chapter__body p:first-child {
  margin-top: clamp(20px, 3vw, 32px);
  color: var(--paper);
}

/* --- 时间线 --- */
.page-about .about-timeline__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
  margin-top: clamp(24px, 3.6vw, 44px);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 2px 16px;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.page-about .about-rail__link::before {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  background-color: var(--edge);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 26% 100%);
  transition: background-color var(--dur-fast) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .about-rail__link:hover::before,
.page-about .about-rail__link:focus-visible::before {
  background-color: var(--lime);
}

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

.page-about .about-node {
  position: relative;
  padding: clamp(20px, 3vw, 32px) 0 clamp(20px, 3vw, 32px) clamp(22px, 3vw, 34px);
  border-bottom: var(--about-line);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(28px, 4vw, 44px);
  width: clamp(12px, 2vw, 20px);
  height: 1px;
  background-color: var(--lime);
  transform: rotate(-38deg);
  transform-origin: left center;
}

.page-about .about-node__year {
  font-size: clamp(20px, 2.8vw, 28px);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-node__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.02rem, 1.8vw, 1.28rem);
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-node__text {
  margin: 8px 0 0;
  max-width: 58ch;
  font-size: clamp(14px, 1vw, 15.5px);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-node--figure {
  padding-left: 0;
  border-bottom: var(--about-line);
}

.page-about .about-node--figure::before {
  display: none;
}

.page-about .about-node--figure img {
  aspect-ratio: 3 / 2;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 26px));
}

/* --- 方法 --- */
.page-about .about-method__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(24px, 3.6vw, 44px);
}

.page-about .about-step {
  border-top: var(--about-line);
}

.page-about .about-step:last-child {
  border-bottom: var(--about-line);
}

.page-about .about-step__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(14.5px, 1.5vw, 17px);
  line-height: 1.5;
  color: var(--paper);
}

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

.page-about .about-step__summary:focus-visible {
  outline: 1px solid var(--lime);
  outline-offset: 4px;
}

.page-about .about-step__idx {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-step__sign {
  position: relative;
  flex: none;
  margin-left: auto;
  align-self: center;
  width: 12px;
  height: 12px;
}

.page-about .about-step__sign::before,
.page-about .about-step__sign::after {
  content: "";
  position: absolute;
  background-color: var(--lime);
  transition: transform var(--dur-base) var(--ease);
}

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

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

.page-about .about-step[open] .about-step__sign::after {
  transform: scaleY(0);
}

.page-about .about-step__body {
  padding: 0 0 22px 0;
}

.page-about .about-step__body p {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(14px, 1vw, 15.5px);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-step[open] .about-step__body {
  animation: about-step-in var(--dur-base) var(--ease);
}

@keyframes about-step-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-about .about-method__aside img {
  aspect-ratio: 10 / 7;
}

/* --- 团队 --- */
.page-about .about-team {
  margin-top: clamp(56px, 8vw, 118px);
  padding: clamp(40px, 6vw, 84px) 0;
  background-color: var(--ink-800);
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(24px, 3.6vw, 40px);
  background-color: var(--edge);
  border: var(--about-line);
}

.page-about .about-team__card {
  padding: clamp(20px, 2.6vw, 32px);
  background-color: var(--ink-800);
}

.page-about .about-team__num {
  font-size: clamp(32px, 4.6vw, 48px);
  font-weight: 500;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-team__name {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .about-team__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-team__total {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

/* --- 原则 --- */
.page-about .about-rules__list {
  list-style: none;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0;
  border-top: var(--about-line);
}

.page-about .about-rule {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  padding: clamp(18px, 2.6vw, 28px) 0;
  border-bottom: var(--about-line);
}

.page-about .about-rule__idx {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
  padding-top: 4px;
}

.page-about .about-rule__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1rem, 1.6vw, 1.16rem);
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-rule__text {
  margin: 8px 0 0;
  max-width: 60ch;
  font-size: clamp(14px, 1vw, 15.5px);
  line-height: 1.9;
  color: var(--mist);
}

/* --- 延伸入口 --- */
.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: clamp(22px, 3.4vw, 36px);
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 4px 16px;
  padding: 16px 18px;
  border: var(--about-line);
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 14px));
  transition: background-color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background-color: var(--ink-700);
  border-color: var(--lime);
}

.page-about .about-next__name {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-next__desc {
  grid-column: 1 / -1;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-next__link::after {
  content: "↗";
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange);
  transition: transform var(--dur-fast) var(--ease);
}

.page-about .about-next__link:hover::after,
.page-about .about-next__link:focus-visible::after {
  transform: translate(2px, -2px);
}

/* --- 平板与桌面 --- */
@media (min-width: 700px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-hero__stat {
    padding: 20px clamp(16px, 2vw, 26px) 22px;
  }

  .page-about .about-hero__stat:first-child {
    padding-left: 0;
  }

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

  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-timeline__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-timeline__grid > * {
    min-width: 0;
  }

  .page-about .about-rail {
    position: sticky;
    top: 108px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
  }

  .page-about .about-node--figure {
    padding-left: clamp(22px, 3vw, 34px);
  }

  .page-about .about-step__summary {
    gap: 16px;
  }

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

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

  .page-about .about-method__aside {
    margin-top: 4px;
  }

  .page-about .about-rule {
    grid-template-columns: 46px 1fr;
    gap: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step[open] .about-step__body {
    animation: none;
  }

  .page-about .about-next__link::after,
  .page-about .about-step__sign::before,
  .page-about .about-step__sign::after {
    transition: none;
  }
}