.page-about {
  --ab-hair: rgba(33, 26, 23, 0.14);
  --ab-line: rgba(159, 176, 200, 0.30);
  --ab-gold-ink: #a87a22;
  --ab-celadon-ink: #2f6b59;
  background: var(--sg-cream);
  color: var(--sg-ink);
}

/* ===== 刊头 ===== */
.page-about .about-masthead {
  position: relative;
  padding: 22px 0 0;
  color: var(--sg-cream);
  background:
    radial-gradient(120% 85% at 82% -10%, rgba(217, 164, 65, 0.24), transparent 60%),
    radial-gradient(90% 70% at 6% 108%, rgba(20, 43, 85, 0.95), transparent 68%),
    var(--sg-sky);
  border-bottom: 1px solid rgba(217, 164, 65, 0.35);
}

.page-about .about-masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.7;
  background-image:
    linear-gradient(to right, rgba(159, 176, 200, 0.10) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(159, 176, 200, 0.10) 1px, transparent 1px);
  background-size: 72px 72px;
}

.page-about .about-masthead > .sg-container {
  position: relative;
  z-index: 1;
}

.page-about .about-masthead__body {
  padding: 30px 0 0;
}

.page-about .about-title {
  margin: 16px 0 0;
  font-family: var(--sg-serif);
  font-weight: 900;
  font-size: clamp(38px, 9vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--sg-cream);
}

.page-about .about-title__accent {
  display: inline-block;
  padding: 0 0.08em;
  color: var(--sg-gold);
}

.page-about .about-lead {
  max-width: 58ch;
  margin: 22px 0 0;
  font-size: clamp(16px, 1.5vw, 18.5px);
  line-height: 1.85;
  color: rgba(247, 241, 228, 0.86);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  background: rgba(159, 176, 200, 0.24);
  border: 1px solid rgba(159, 176, 200, 0.24);
  border-radius: var(--sg-radius-sm);
  overflow: hidden;
}

.page-about .about-facts__item {
  padding: 15px 16px;
  background: rgba(11, 27, 58, 0.62);
}

.page-about .about-facts__key {
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--sg-mist);
}

.page-about .about-facts__val {
  margin: 6px 0 0;
  font-family: var(--sg-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--sg-gold-bright);
}

.page-about .about-hero {
  margin: 34px 0 0;
  padding-bottom: 46px;
}

.page-about .about-figure {
  margin: 22px 0 0;
  border-radius: var(--sg-radius);
  overflow: hidden;
  border: 1px solid var(--ab-line);
  background: linear-gradient(150deg, var(--sg-sky-deep), var(--sg-sky));
}

.page-about .about-hero .about-figure {
  margin: 0;
}

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

.page-about .about-figure--hero img {
  aspect-ratio: 16 / 10;
}

.page-about .about-figure--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--tall img {
  aspect-ratio: 4 / 3;
}

.page-about .about-figure__cap {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: rgba(33, 26, 23, 0.62);
}

.page-about .about-hero .about-figure__cap {
  color: var(--sg-mist);
}

/* ===== 正文骨架 ===== */
.page-about .about-body {
  padding: 44px 0 64px;
}

.page-about .about-layout {
  display: grid;
  gap: 34px;
}

/* ===== 章节索引 ===== */
.page-about .about-index {
  border-top: 2px solid var(--sg-gold);
  padding-top: 16px;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: rgba(33, 26, 23, 0.55);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 10px 9px 12px;
  border-left: 2px solid transparent;
  font-size: 15px;
  color: rgba(33, 26, 23, 0.78);
  text-decoration: none;
  transition: background 0.2s var(--sg-ease), border-color 0.2s var(--sg-ease), color 0.2s var(--sg-ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-left-color: var(--sg-gold);
  background: rgba(217, 164, 65, 0.12);
  color: var(--sg-ink);
}

.page-about .about-index__num {
  font-family: var(--sg-serif);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ab-gold-ink);
}

.page-about .about-ticks {
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px solid var(--ab-hair);
}

.page-about .about-ticks__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-tick {
  display: inline-block;
  padding: 5px 10px;
  border: 1px solid var(--ab-hair);
  border-radius: 999px;
  font-family: var(--sg-serif);
  font-size: 12.5px;
  color: rgba(33, 26, 23, 0.72);
  text-decoration: none;
  transition: border-color 0.2s var(--sg-ease), color 0.2s var(--sg-ease);
}

.page-about .about-tick:hover,
.page-about .about-tick:focus-visible {
  border-color: var(--sg-gold);
  color: var(--ab-gold-ink);
}

/* ===== 章节 ===== */
.page-about .about-chapter {
  padding: 38px 0;
  border-top: 1px solid var(--ab-hair);
}

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

.page-about .about-chapter__no {
  margin: 0;
  font-family: var(--sg-serif);
  font-size: 12.5px;
  letter-spacing: 0.2em;
  color: var(--ab-gold-ink);
}

.page-about .about-chapter h2 {
  margin: 10px 0 0;
  font-family: var(--sg-serif);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--sg-ink);
}

.page-about .about-chapter > p {
  margin: 14px 0 0;
  font-size: 16.5px;
  line-height: 1.85;
  color: rgba(33, 26, 23, 0.86);
}

/* ===== 服务带 ===== */
.page-about .about-services {
  margin-top: 24px;
}

.page-about .about-service {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 6px;
  padding: 20px 0;
  border-top: 1px solid var(--ab-hair);
}

.page-about .about-service:first-child {
  border-top: 1px solid var(--ab-hair);
}

.page-about .about-service__no {
  font-family: var(--sg-serif);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ab-gold-ink);
  padding-top: 4px;
}

.page-about .about-service__title {
  margin: 0;
  font-family: var(--sg-serif);
  font-size: 19px;
  font-weight: 800;
  color: var(--sg-ink);
}

.page-about .about-service__body p {
  margin: 8px 0 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(33, 26, 23, 0.82);
}

.page-about .about-service__meta {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .about-chip {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid rgba(33, 26, 23, 0.2);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(33, 26, 23, 0.72);
}

.page-about .about-chip--ok {
  border-color: rgba(111, 175, 154, 0.65);
  background: rgba(111, 175, 154, 0.14);
  color: var(--ab-celadon-ink);
}

/* ===== 时间线 ===== */
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--sg-gold), rgba(217, 164, 65, 0.12));
}

.page-about .about-timeline li {
  position: relative;
  padding: 0 0 22px 30px;
}

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

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--sg-cream);
  border: 2px solid var(--sg-gold);
  transition: background 0.25s var(--sg-ease), box-shadow 0.25s var(--sg-ease);
}

.page-about .about-timeline li:hover::before {
  background: var(--sg-gold);
  box-shadow: 0 0 0 4px rgba(217, 164, 65, 0.18);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--sg-serif);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--ab-gold-ink);
}

.page-about .about-timeline__text {
  margin: 4px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(33, 26, 23, 0.84);
}

/* ===== 团队 ===== */
.page-about .about-team {
  display: grid;
  gap: 22px;
  margin-top: 22px;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 13px 14px;
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid var(--ab-hair);
  border-left: 2px solid rgba(111, 175, 154, 0.7);
  border-radius: var(--sg-radius-sm);
}

.page-about .about-role__tag {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--ab-celadon-ink);
  font-weight: 600;
  padding-top: 2px;
}

.page-about .about-role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(33, 26, 23, 0.8);
}

.page-about .about-team__note {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(33, 26, 23, 0.78);
}

.page-about .about-team .about-figure {
  margin: 0;
}

/* ===== 规模数据 ===== */
.page-about .about-stats {
  display: grid;
  gap: 18px;
  margin: 24px 0 0;
  padding: 26px 20px;
  border-radius: var(--sg-radius);
  border: 1px solid rgba(217, 164, 65, 0.35);
  background:
    radial-gradient(120% 120% at 92% 0%, rgba(217, 164, 65, 0.22), transparent 62%),
    var(--sg-sky);
  color: var(--sg-cream);
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--sg-serif);
  font-size: clamp(26px, 4.2vw, 36px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--sg-gold-bright);
}

.page-about .about-stat__label {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: rgba(247, 241, 228, 0.8);
}

/* ===== 邀请 ===== */
.page-about .about-invite {
  margin-top: 22px;
  padding: 22px 20px;
  border-left: 3px solid var(--sg-gold);
  border-radius: 0 var(--sg-radius-sm) var(--sg-radius-sm) 0;
  background: rgba(217, 164, 65, 0.1);
}

.page-about .about-invite__line {
  margin: 0;
  font-family: var(--sg-serif);
  font-size: 19px;
  font-weight: 700;
  color: var(--sg-ink);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.page-about .about-linkbtn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: 999px;
  border: 1px solid rgba(33, 26, 23, 0.28);
  font-size: 15px;
  font-weight: 600;
  color: var(--sg-ink);
  text-decoration: none;
  transition: border-color 0.2s var(--sg-ease), background 0.2s var(--sg-ease);
}

.page-about .about-linkbtn:hover,
.page-about .about-linkbtn:focus-visible {
  border-color: var(--sg-gold);
  background: rgba(217, 164, 65, 0.16);
}

/* ===== 响应式 ===== */
@media (min-width: 640px) {
  .page-about .about-service {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 10px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
    padding: 30px 26px;
  }

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

  .page-about .about-tick {
    text-align: center;
  }
}

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

  .page-about .about-timeline li {
    display: grid;
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 14px;
    align-items: baseline;
  }

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

  .page-about .about-team {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 28px;
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-masthead__body {
    padding-top: 38px;
  }

  .page-about .about-body {
    padding: 60px 0 84px;
  }

  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 54px;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 24px;
  }

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

  .page-about .about-chapter {
    padding: 48px 0;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-figure--wide img {
    aspect-ratio: 21 / 9;
  }

  .page-about .about-figure--tall img {
    aspect-ratio: 3 / 4;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-tick,
  .page-about .about-linkbtn,
  .page-about .about-timeline li::before {
    transition: none;
  }
}