.page-about {
  display: block;
  background: var(--deep);
  color: var(--silver);
  font-family: var(--font-sans);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* ================= 封面 ================= */
.page-about .about-cover {
  position: relative;
  overflow: hidden;
  padding: 20px 0 56px;
  background:
    radial-gradient(120% 96% at 88% 0%, rgba(255, 106, 26, 0.20), transparent 58%),
    linear-gradient(180deg, var(--deep) 0%, var(--night) 100%);
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(195, 207, 226, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(195, 207, 226, 0.055) 1px, transparent 1px);
  background-size: 24px 24px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  pointer-events: none;
}

.page-about .about-cover::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 52%;
  height: 100%;
  background: linear-gradient(108deg,
      transparent 40%,
      rgba(255, 146, 69, 0.12) 40.4%,
      transparent 62%);
  pointer-events: none;
}

.page-about .about-cover__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 34px;
  align-items: center;
}

.page-about .about-cover h1 {
  margin: 14px 0 18px;
  font-size: clamp(1.7rem, 4.8vw, 3.05rem);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -0.015em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-cover__lead {
  max-width: 60ch;
  margin: 0;
  font-size: clamp(0.98rem, 1.5vw, 1.08rem);
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  background: var(--hairline-strong);
  border: 1px solid var(--hairline);
}

.page-about .about-facts__item {
  background: rgba(11, 34, 70, 0.86);
  padding: 14px 16px;
}

.page-about .about-facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(195, 207, 226, 0.78);
}

.page-about .about-facts dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 3.2vw, 1.65rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--orange);
}

.page-about .about-cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

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

.page-about .about-cover__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ================= 章节流 ================= */
.page-about .about-stream {
  position: relative;
  padding: 8px 0 0;
}

.page-about .about-chapter {
  position: relative;
  padding: 44px 0;
  border-top: 1px solid var(--hairline);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 52px;
}

.page-about .about-chapter__title {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 0 0 18px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-chapter__no {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 106, 26, 0.85);
}

.page-about .about-chapter__text {
  font-size: clamp(1.2rem, 2.6vw, 1.8rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
}

.page-about .about-chapter__lead {
  max-width: 68ch;
  margin: 0 0 26px;
  font-size: clamp(0.98rem, 1.5vw, 1.06rem);
  color: var(--silver);
}

/* ---- 01 三支柱 ---- */
.page-about .about-pillars {
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .about-pillars__item {
  position: relative;
  background: var(--night);
  padding: 26px 22px;
}

.page-about .about-pillars__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 2px;
  background: var(--orange);
}

.page-about .about-pillars__item h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-pillars__item p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--silver);
}

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

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 30px 30px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--deep);
  border: 1px solid rgba(255, 106, 26, 0.6);
  transform: rotate(45deg);
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease);
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 20px;
  bottom: 6px;
  width: 1px;
  background: var(--hairline);
}

.page-about .about-timeline__item:last-child::after {
  display: none;
}

.page-about .about-timeline__item.is-in::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .about-timeline__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}

.page-about .about-timeline__head h3 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-timeline__stage {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ember);
}

.page-about .about-timeline__item p {
  margin: 0;
  max-width: 64ch;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--silver);
}

/* ---- 03 数据条 ---- */
.page-about .about-bars {
  margin: 0 0 30px;
  border-top: 1px solid var(--hairline);
}

.page-about .about-bars__row {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "label value"
    "track track";
  gap: 8px 16px;
  align-items: center;
  padding: 15px 0;
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-bars__label {
  grid-area: label;
  font-size: 0.94rem;
  color: var(--silver);
}

.page-about .about-bars__track {
  grid-area: track;
  display: block;
  height: 6px;
  background: rgba(195, 207, 226, 0.1);
  overflow: hidden;
}

.page-about .about-bars__fill {
  display: block;
  height: 100%;
  width: var(--w, 60%);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--orange), var(--ember));
}

.page-about .about-chapter.is-in .about-bars__fill {
  animation: about-bar-in 0.8s var(--ease) both;
}

.page-about .about-bars__row:nth-child(1) .about-bars__fill { --w: 100%; }
.page-about .about-bars__row:nth-child(2) .about-bars__fill { --w: 78%; }
.page-about .about-bars__row:nth-child(3) .about-bars__fill { --w: 92%; }
.page-about .about-bars__row:nth-child(4) .about-bars__fill { --w: 48%; }

.page-about .about-bars__val {
  grid-area: value;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

@keyframes about-bar-in {
  from { transform: scaleX(0); }
  to   { transform: scaleX(1); }
}

.page-about .about-figure {
  margin: 0 0 28px;
}

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

.page-about .about-rhythm p {
  max-width: 68ch;
  margin: 0 0 20px;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-rhythm__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .about-rhythm__list li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--night);
  padding: 14px 16px;
}

.page-about .about-rhythm__list strong {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--orange);
}

.page-about .about-rhythm__list span {
  font-size: 0.92rem;
  color: var(--silver);
}

/* ---- 04 团队 ---- */
.page-about .about-team {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: 28px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .about-team__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--night);
  padding: 20px 16px;
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-team__cell:hover {
  background: var(--tactic);
  box-shadow: inset 0 0 0 1px rgba(255, 106, 26, 0.5);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-team__label {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--silver);
}

.page-about .about-team__cell--note h3 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-team__cell--note p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--silver);
}

/* ---- 05 地区与备案 ---- */
.page-about .about-region {
  display: grid;
  gap: 24px;
}

.page-about .about-region__body p {
  max-width: 66ch;
  margin: 0 0 16px;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-region__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-region__card {
  background: var(--cold);
  color: var(--ink);
  padding: 24px 20px;
  border-top: 3px solid var(--orange);
}

.page-about .about-region__card h3 {
  margin: 0 0 14px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

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

.page-about .about-region__card dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: #5a6b85;
}

.page-about .about-region__card dd {
  margin: 3px 0 14px;
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--ink);
  overflow-wrap: break-word;
}

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

/* ================= 收束带 ================= */
.page-about .about-outro {
  padding: 44px 0 72px;
}

.page-about .about-outro__title {
  margin: 20px 0 12px;
  font-size: clamp(1.2rem, 2.8vw, 1.7rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-outro__text {
  max-width: 62ch;
  margin: 0 0 24px;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ================= 响应式 ================= */
@media (min-width: 620px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-bars__row {
    grid-template-columns: 172px minmax(0, 1fr) 96px;
    grid-template-areas: "label track value";
    gap: 0 20px;
  }
}

@media (min-width: 800px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-team__cell {
    padding: 24px 20px;
  }
}

@media (min-width: 860px) {
  .page-about .about-region {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: 36px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-stream {
    padding-left: 88px;
  }

  .page-about .about-stream::before {
    content: "";
    position: absolute;
    left: 23px;
    top: 56px;
    bottom: 56px;
    width: 1px;
    background: linear-gradient(180deg,
        rgba(255, 106, 26, 0.9) 0%,
        rgba(255, 106, 26, 0.3) 46%,
        rgba(255, 106, 26, 0) 100%);
  }

  .page-about .about-chapter::before {
    content: "";
    position: absolute;
    left: -70px;
    top: 56px;
    width: 10px;
    height: 10px;
    background: var(--deep);
    border: 1px solid rgba(255, 106, 26, 0.55);
    transform: rotate(45deg);
    transition: background 0.35s var(--ease),
                border-color 0.35s var(--ease),
                box-shadow 0.35s var(--ease);
  }

  .page-about .about-chapter.is-in::before {
    background: var(--orange);
    border-color: var(--orange);
    box-shadow: 0 0 0 5px rgba(255, 106, 26, 0.14);
  }
}

@media (min-width: 960px) {
  .page-about .about-cover {
    padding: 28px 0 72px;
  }

  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 56px;
  }

  .page-about .about-chapter {
    padding: 56px 0;
  }

  .page-about .about-chapter:first-child {
    padding-top: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-chapter.is-in .about-bars__fill {
    animation: none;
  }

  .page-about .about-timeline__item::before,
  .page-about .about-team__cell,
  .page-about .about-chapter::before {
    transition: none;
  }
}