/* ===== page-about · 品牌档案 ===== */
.page-about {
  --about-mark: 62px;
  --about-gap: 18px;
  --about-rule: rgba(23, 19, 15, 0.16);
  --about-rule-soft: rgba(23, 19, 15, 0.09);
  --about-rule-dark: rgba(251, 249, 244, 0.18);
  --about-dark-text: rgba(251, 249, 244, 0.78);
  --about-dark-soft: rgba(251, 249, 244, 0.6);
}

/* ---- 首屏 ---- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(22px, 4vw, 42px) clamp(34px, 6vw, 78px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(to right, var(--line-soft) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(to bottom, var(--line-soft) 0 1px, transparent 1px 44px);
  opacity: 0.65;
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(20px, 3vw, 38px);
}

.page-about .about-hero__main h1 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(29px, 4.4vw, 58px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 14px 0 0;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.8;
  max-width: 58ch;
  margin: 18px 0 0;
  color: var(--ink);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-hero__side {
  border: 1px solid var(--about-rule);
  background: rgba(231, 222, 205, 0.5);
}

.page-about .about-hero__side dl {
  margin: 0;
}

.page-about .about-hero__side dl > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 12px clamp(14px, 2vw, 22px);
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .about-hero__side dl > div:last-child {
  border-bottom: 0;
}

.page-about .about-hero__side dt {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .about-hero__side dd {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}

.page-about .about-hero__side dd .num {
  font-family: var(--font-mono);
  font-size: clamp(19px, 2vw, 25px);
  color: var(--cyan-deep);
}

/* ---- 章节通用 ---- */
.page-about .about-chapter {
  padding-block: clamp(38px, 6vw, 86px);
}

.page-about .about-chapter__head {
  max-width: 74ch;
  margin-bottom: clamp(24px, 4vw, 46px);
}

.page-about .about-chapter__head h2 {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(23px, 3vw, 40px);
  line-height: 1.25;
  margin: 10px 0 0;
}

.page-about .about-chapter__lead {
  margin: 14px 0 0;
  line-height: 1.8;
  max-width: 64ch;
  font-size: clamp(15px, 1.4vw, 17px);
}

/* ---- 暗区文字适配 ---- */
.page-about .band--dark {
  color: var(--mist);
}

.page-about .band--dark .about-chapter__lead,
.page-about .band--dark .muted {
  color: var(--about-dark-soft);
}

.page-about .band--dark a {
  color: var(--cyan);
}

/* ---- 01 两条主线 ---- */
.page-about .about-split {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
}

.page-about .about-split__text p {
  margin: 0 0 16px;
  line-height: 1.85;
}

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

.page-about .about-split__note {
  border: 1px solid var(--about-rule);
  border-left: 3px solid var(--rust);
  padding: clamp(18px, 2.4vw, 28px);
  background: rgba(231, 222, 205, 0.42);
}

.page-about .about-split__note-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rust);
  margin: 0;
}

.page-about .about-split__note-list {
  list-style: none;
  margin: 14px 0 16px;
  padding: 0;
}

.page-about .about-split__note-list li {
  position: relative;
  padding-left: 18px;
  line-height: 1.9;
  font-size: 15px;
}

.page-about .about-split__note-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 8px;
  height: 1px;
  background: var(--cyan-deep);
}

.page-about .about-split__note .muted {
  font-size: 13px;
  line-height: 1.7;
  margin: 0;
  color: var(--slate);
}

/* ---- 02 时间轴 ---- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: var(--about-mark);
  width: 1px;
  background: var(--about-rule);
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-mark) minmax(0, 1fr);
  column-gap: var(--about-gap);
  padding-block: clamp(20px, 3vw, 32px);
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .about-timeline__item:first-child {
  padding-top: 0;
}

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

.page-about .about-timeline__mark {
  position: relative;
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.5vw, 19px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.page-about .about-timeline__dot {
  position: absolute;
  top: 5px;
  right: -4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper-2);
  border: 2px solid var(--rust);
}

.page-about .about-timeline__body h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(17px, 1.9vw, 23px);
  line-height: 1.35;
  margin: 0 0 8px;
}

.page-about .about-timeline__body p {
  margin: 0;
  line-height: 1.8;
  font-size: 15px;
  max-width: 66ch;
}

.page-about .about-timeline__metric {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--about-rule);
  opacity: 0.78;
  transition: opacity 0.2s ease;
}

.page-about .about-timeline__item:hover .about-timeline__metric,
.page-about .about-timeline__item:focus-within .about-timeline__metric {
  opacity: 1;
}

.page-about .about-timeline__value {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-deep);
  letter-spacing: -0.01em;
}

.page-about .about-timeline__unit {
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
  max-width: 42ch;
}

/* ---- 03 团队 ---- */
.page-about .about-team__figure {
  margin: 0 0 clamp(26px, 3.5vw, 44px);
}

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

.page-about .band--dark .figure__caption {
  color: var(--about-dark-soft);
}

.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  border-top: 1px solid var(--about-rule-dark);
}

.page-about .about-team__col {
  padding: clamp(22px, 3vw, 34px) clamp(16px, 2.2vw, 28px);
  border-bottom: 1px solid var(--about-rule-dark);
  transition: background-color 0.2s ease;
}

.page-about .about-team__col:last-child {
  border-bottom: 0;
}

.page-about .about-team__col:hover,
.page-about .about-team__col:focus-within {
  background: rgba(18, 227, 209, 0.06);
}

.page-about .about-team__col:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-team__label {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin: 0;
  color: var(--about-dark-soft);
  text-transform: uppercase;
}

.page-about .about-team__num {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(48px, 7vw, 84px);
  font-weight: 700;
  line-height: 0.95;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-team__unit {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--about-dark-soft);
  margin-left: 8px;
}

.page-about .about-team__brief {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-dark-text);
  max-width: 30ch;
}

.page-about .about-team__duties {
  margin: 14px 0 0;
  padding-left: 16px;
}

.page-about .about-team__duties li {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-dark-soft);
}

/* ---- 04 内容流程 ---- */
.page-about .about-flow {
  list-style: none;
  counter-reset: flow;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-rule-soft);
  border: 1px solid var(--about-rule-soft);
}

.page-about .about-flow__step {
  background: var(--paper);
  padding: clamp(18px, 2.4vw, 28px);
}

.page-about .about-flow__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rust);
}

.page-about .about-flow__step h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(17px, 1.8vw, 21px);
  margin: 10px 0 8px;
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-flow__foot {
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: 15px;
  line-height: 1.8;
  padding-top: 16px;
  border-top: 1px solid var(--about-rule-soft);
}

.page-about .about-flow__foot a {
  color: var(--cyan-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---- 05 本地化 ---- */
.page-about .about-local {
  display: grid;
  gap: clamp(22px, 3vw, 42px);
}

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

.page-about .about-local__list li {
  padding: 15px 0;
  border-top: 1px solid var(--about-rule);
  line-height: 1.8;
  font-size: 15px;
}

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

.page-about .about-local__list strong {
  font-weight: 700;
  color: var(--ink);
}

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

/* ---- 06 合作生态 ---- */
.page-about .about-eco {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}

.page-about .about-eco__item {
  border: 1px solid var(--about-rule-dark);
  padding: clamp(20px, 2.6vw, 30px);
  transition: border-color 0.2s ease;
}

.page-about .about-eco__item:hover {
  border-color: var(--cyan);
}

.page-about .about-eco__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(38px, 5vw, 62px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.page-about .about-eco__label {
  margin: 10px 0 0;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-eco__desc {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-dark-soft);
}

.page-about .about-honor {
  margin-top: clamp(24px, 3.5vw, 40px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--about-rule-dark);
  display: grid;
  gap: 14px;
}

.page-about .about-honor p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-dark-text);
  max-width: 68ch;
}

/* ---- 07 备案与规范 ---- */
.page-about .about-compliance {
  display: grid;
  gap: clamp(22px, 3vw, 42px);
}

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

.page-about .about-register {
  width: 100%;
  border-collapse: collapse;
  margin: 0;
}

.page-about .about-register th,
.page-about .about-register td {
  text-align: left;
  padding: 13px 0;
  border-bottom: 1px solid var(--about-rule-soft);
  font-size: 14px;
  line-height: 1.7;
  vertical-align: top;
}

.page-about .about-register th {
  font-weight: 600;
  color: var(--slate);
}

.page-about .about-register td {
  color: var(--ink);
}

.page-about .about-register td.num {
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

.page-about .about-versions {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  margin-top: clamp(22px, 3vw, 34px);
  padding: 16px 2px 18px;
  border-top: 1px solid var(--about-rule-soft);
  border-bottom: 1px solid var(--about-rule-soft);
  scrollbar-width: thin;
}

.page-about .about-versions:focus-visible {
  outline: 2px solid var(--cyan-deep);
  outline-offset: 2px;
}

.page-about .about-versions > * {
  flex: 0 0 auto;
}

.page-about .about-compliance__foot {
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-compliance__foot a {
  color: var(--cyan-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

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

@media (min-width: 900px) {
  .page-about {
    --about-mark: 126px;
    --about-gap: 40px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-split__note {
    margin-top: 34px;
  }

  .page-about .about-team {
    grid-template-columns: 1.05fr 1fr 1.25fr;
  }

  .page-about .about-team__col {
    border-bottom: 0;
    border-right: 1px solid var(--about-rule-dark);
  }

  .page-about .about-team__col:last-child {
    border-right: 0;
  }

  .page-about .about-team__col:nth-child(2) {
    padding-top: calc(clamp(22px, 3vw, 34px) + 18px);
  }

  .page-about .about-team__col:nth-child(3) {
    padding-top: calc(clamp(22px, 3vw, 34px) + 34px);
  }

  .page-about .about-local {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

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

  .page-about .about-compliance {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

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

  .page-about .about-flow__step:nth-child(2),
  .page-about .about-flow__step:nth-child(5) {
    padding-top: calc(clamp(18px, 2.4vw, 28px) + 14px);
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__lead {
    font-size: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__metric,
  .page-about .about-team__col,
  .page-about .about-eco__item {
    transition: none;
  }
}
</main>