/* ============ 品牌档案 /introduction/ ============ */

.page-about {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 首屏：档案封面 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 60px) 0 clamp(22px, 4vw, 44px);
  background:
    radial-gradient(120% 96% at 10% 0%, rgba(23, 85, 63, 0.78) 0%, rgba(11, 15, 14, 0) 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(46, 122, 94, 0.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 122, 94, 0.14) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 82%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 82%);
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--line);
  border-left: 4px solid var(--lime);
  background: rgba(11, 15, 14, 0.62);
  padding: clamp(20px, 3.4vw, 40px);
  max-width: 920px;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 10px;
  background-image: repeating-linear-gradient(180deg, var(--moss) 0 1px, transparent 1px 16px);
  opacity: 0.6;
  pointer-events: none;
}

.page-about .about-hero .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--lime);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 5.2vw, 54px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--paper);
  max-width: 20em;
}

.page-about .about-hero__lede {
  margin: 16px 0 0;
  max-width: 42em;
  font-size: clamp(15px, 1.6vw, 17px);
  color: var(--paper);
  opacity: 0.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 4vw, 40px) 0 0;
  border: 1px solid var(--line);
  background: var(--line-soft);
}

.page-about .about-hero__figures > div {
  background: rgba(11, 15, 14, 0.86);
  padding: 16px clamp(14px, 2vw, 22px);
}

.page-about .about-hero__figures dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mute);
}

.page-about .about-hero__figures dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1;
  color: var(--lime);
}

/* ---------- 主体：目录 + 正文 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.6vw, 40px);
  padding-top: clamp(30px, 5vw, 64px);
  padding-bottom: clamp(10px, 2vw, 20px);
}

.page-about .about-content {
  min-width: 0;
}

/* 目录索引 */

.page-about .about-index {
  position: relative;
  border-top: 2px solid var(--lime);
  padding-top: 12px;
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mute);
}

.page-about .index-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .index-list__item {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .index-list__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 2px;
  color: var(--mute);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s var(--ease);
}

.page-about .index-list__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--moss);
}

.page-about .index-list__link:hover {
  color: var(--paper);
}

.page-about .index-list__link.is-active {
  color: var(--lime);
}

.page-about .index-list__link.is-active .index-list__num {
  color: var(--lime);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  scroll-margin-top: calc(var(--hdr-h) + 26px);
  padding-top: clamp(26px, 4vw, 42px);
  margin-top: clamp(26px, 4vw, 42px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-section:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-about .about-sec__head {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 20px;
}

.page-about .section__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(30px, 6vw, 52px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--moss);
}

.page-about .section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 3.2vw, 30px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .section__lede {
  margin: 10px 0 0;
  max-width: 40em;
  font-size: 15.5px;
  color: var(--mute);
}

/* ---------- 正文与旁注 ---------- */

.page-about .about-p {
  margin: 0 0 16px;
  max-width: 40em;
  font-size: 16px;
  color: var(--paper);
  opacity: 0.86;
}

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

.page-about .about-note {
  margin: 22px 0 0;
  border-left: 2px solid var(--amber);
  padding: 2px 0 2px 14px;
  max-width: 38em;
}

.page-about .about-note__key {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .about-note p {
  margin: 6px 0 0;
  font-size: 14px;
  color: var(--mute);
}

/* ---------- 图片框 ---------- */

.page-about .media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-soft);
  margin: 0;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.6) contrast(1.12) brightness(0.9);
}

.page-about .media-frame--16x9 {
  aspect-ratio: 16 / 9;
}

.page-about .media-frame--4x3 {
  aspect-ratio: 4 / 3;
}

.page-about .media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 26px 14px 10px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--paper);
  background: linear-gradient(180deg, rgba(11, 15, 14, 0) 0%, rgba(11, 15, 14, 0.88) 70%);
}

/* ---------- 标签 ---------- */

.page-about .tag {
  display: inline-block;
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(23, 85, 63, 0.3);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mute);
  white-space: nowrap;
}

.page-about .tag--amber {
  background: rgba(224, 178, 58, 0.16);
  border-color: var(--amber);
  color: var(--amber);
}

.page-about .tag--lime {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 02 时间轴 ---------- */

.page-about .about-timeline__media {
  margin-bottom: clamp(24px, 3.6vw, 40px);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime) 0%, var(--moss) 42%, rgba(46, 122, 94, 0.1) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 6px;
  width: 9px;
  height: 9px;
  border: 2px solid var(--moss);
  background: var(--ink);
  transform: rotate(45deg);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(17px, 2.4vw, 22px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-about .about-timeline__title {
  margin: 7px 0 5px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 38em;
  font-size: 14.5px;
  color: var(--mute);
}

.page-about .about-timeline__tags {
  list-style: none;
  margin: 9px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

/* ---------- 03 资料来源 ---------- */

.page-about .about-sources {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-src {
  position: relative;
  border: 1px solid var(--line);
  border-top: 3px solid var(--moss);
  background: linear-gradient(180deg, rgba(23, 85, 63, 0.42) 0%, rgba(11, 15, 14, 0.9) 100%);
  padding: 18px 18px 22px;
}

.page-about .about-src__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--lime);
}

.page-about .about-src__title {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-src__text {
  margin: 0;
  font-size: 14.5px;
  color: var(--mute);
}

.page-about .about-src::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--lime), rgba(198, 255, 61, 0) 72%);
  opacity: 0.55;
}

.page-about .about-sources__note {
  margin-top: 26px;
}

.page-about .about-sources__media {
  margin-top: clamp(22px, 3.4vw, 36px);
}

/* ---------- 04 处理流程 ---------- */

.page-about .about-process {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-process__step {
  position: relative;
  padding: 16px 16px 18px;
  border: 1px solid var(--line-soft);
  background: rgba(14, 43, 35, 0.62);
}

.page-about .about-process__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--moss);
  border-radius: 50%;
  background: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--lime);
}

.page-about .about-process__name {
  margin: 12px 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-process__text {
  margin: 0;
  font-size: 14.5px;
  color: var(--mute);
}

.page-about .about-process__time {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--moss);
}

/* ---------- 05 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

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

.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line-soft);
  align-self: start;
}

.page-about .about-team__stat {
  background: rgba(14, 43, 35, 0.7);
  padding: 14px 16px;
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-team__lab {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mute);
}

.page-about .about-team__media {
  margin-top: clamp(22px, 3.4vw, 36px);
}

/* ---------- 06 覆盖规模 ---------- */

.page-about .about-scale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line-soft);
}

.page-about .about-scale__cell {
  background: rgba(14, 43, 35, 0.55);
  padding: clamp(16px, 2.4vw, 24px) clamp(14px, 2vw, 20px);
}

.page-about .about-scale__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 3.4vw, 36px);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-scale__lab {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--mute);
}

/* ---------- 07 资质与共建 ---------- */

.page-about .about-cred {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-cred__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-cred__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .about-cred__title {
  margin: 0 0 6px;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .about-cred__text {
  margin: 0;
  max-width: 40em;
  font-size: 14.5px;
  color: var(--mute);
}

/* ---------- 08 更新节奏 ---------- */

.page-about .about-cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-cadence__card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(14, 43, 35, 0.55);
  padding: 20px 20px 22px 24px;
}

.page-about .about-cadence__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--lime);
}

.page-about .about-cadence__card--alt::before {
  background: var(--amber);
}

.page-about .about-cadence__title {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-cadence__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .about-cadence__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--mute);
}

.page-about .about-cadence__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background: var(--moss);
  transform: rotate(45deg);
}

.page-about .about-cadence__foot {
  margin-top: 22px;
  font-size: 14.5px;
  color: var(--mute);
  opacity: 1;
}

/* ---------- 延伸入口 ---------- */

.page-about .about-next {
  border-top: 1px solid var(--line-soft);
  padding: clamp(26px, 4vw, 44px) 0 clamp(40px, 6vw, 76px);
}

.page-about .about-next__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
}

.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.6vw, 24px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-next__item {
  display: block;
  padding: 18px 16px 20px;
  border: 1px solid var(--line);
  background: rgba(14, 43, 35, 0.5);
  text-decoration: none;
  color: var(--paper);
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  border-color: var(--lime);
  background: rgba(23, 85, 63, 0.72);
  transform: translateY(-2px);
}

.page-about .about-next__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--moss);
}

.page-about .about-next__t {
  display: block;
  margin-top: 10px;
  font-size: 15.5px;
  font-weight: 700;
}

.page-about .about-next__d {
  display: block;
  margin-top: 7px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mute);
}

/* ---------- 入场动效 ---------- */

.page-about [data-reveal] {
  transform: translateY(12px);
  transition: transform 0.32s var(--ease);
}

.page-about [data-reveal].is-visible {
  transform: translateY(0);
}

/* ---------- 响应式 ---------- */

@media (min-width: 680px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-hero__figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-sec__head {
    flex-direction: row;
    align-items: flex-start;
    gap: 22px;
  }

  .page-about .about-sec__head > div {
    flex: 1 1 auto;
    min-width: 0;
  }

  .page-about .section__num {
    flex: 0 0 auto;
    margin-top: -6px;
  }

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

  .page-about .about-sources > :nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-sources > :nth-child(3) {
    margin-top: 52px;
  }

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

  .page-about .about-cred__item {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 820px) {
  .page-about .about-process {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    position: relative;
  }

  .page-about .about-process::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 29px;
    height: 1px;
    background: linear-gradient(90deg, rgba(46, 122, 94, 0) 0%, var(--moss) 10%, var(--moss) 90%, rgba(46, 122, 94, 0) 100%);
    opacity: 0.5;
  }

  .page-about .about-process__step {
    border: 0;
    background: transparent;
    padding: 52px 18px 0;
  }

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

  .page-about .about-process__step:last-child {
    padding-right: 0;
  }

  .page-about .about-process__no {
    position: absolute;
    top: 13px;
    left: 18px;
  }

  .page-about .about-process__step:first-child .about-process__no {
    left: 0;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 48px);
    align-items: start;
  }

  .page-about .about-cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(32px, 4.4vw, 64px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--hdr-h) + 18px);
    max-height: calc(100vh - var(--hdr-h) - 48px);
    overflow-y: auto;
    padding-bottom: 8px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 999px) {
  .page-about .about-index {
    overflow-x: auto;
    padding-bottom: 6px;
  }

  .page-about .about-index__title {
    display: none;
  }

  .page-about .index-list {
    display: flex;
    gap: 8px;
  }

  .page-about .index-list__item {
    flex: 0 0 auto;
    border: 1px solid var(--line);
    border-radius: 2px;
  }

  .page-about .index-list__link {
    padding: 7px 12px;
    font-size: 13px;
    white-space: nowrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    transform: none;
    transition: none;
  }

  .page-about .about-next__item {
    transition: none;
  }
}