.page-about {
  --about-panel: rgba(15, 19, 56, .52);
  --about-hairline: rgba(140, 160, 255, .14);
  position: relative;
  overflow-x: clip;
}

/* ── 首屏 ── */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 4.5vw, 44px) 0 clamp(52px, 8vw, 104px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -16%;
  width: min(760px, 92vw);
  aspect-ratio: 1 / 1;
  border-radius: 46% 54% 62% 38% / 52% 42% 58% 48%;
  background:
    radial-gradient(circle at 34% 32%, rgba(123, 79, 214, .36), transparent 62%),
    radial-gradient(circle at 68% 66%, rgba(63, 227, 255, .15), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -18%;
  bottom: -26%;
  width: min(540px, 72vw);
  aspect-ratio: 1 / 1;
  border-radius: 58% 42% 38% 62% / 46% 58% 42% 54%;
  background: radial-gradient(circle at 40% 40%, rgba(230, 201, 141, .09), transparent 64%);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 66px);
  align-items: end;
  margin-top: clamp(26px, 4vw, 46px);
}

.page-about .hero-copy .display-1 {
  margin: 12px 0 20px;
  line-height: 1.12;
}

.page-about .hero-mark {
  color: var(--gold);
  background: linear-gradient(180deg, transparent 64%, rgba(123, 79, 214, .42) 64%);
  border-radius: 3px;
  padding: 0 .05em;
}

.page-about .hero-copy .lead {
  max-width: 46ch;
}

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

.page-about .hero-figure::after {
  content: "";
  position: absolute;
  inset: auto -8% -6% auto;
  width: 62%;
  height: 34%;
  background: radial-gradient(ellipse at 60% 60%, rgba(63, 227, 255, .18), transparent 70%);
  pointer-events: none;
}

.page-about .hero-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-l) var(--radius-l) var(--radius-m) var(--radius-l);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, var(--void-2), var(--void-3));
}

.page-about .hero-figure .media-caption {
  margin-top: 14px;
  color: var(--text-mute);
  font-size: 13px;
  line-height: 1.7;
}

/* ── 编号章节骨架 ── */
.page-about .chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.4vw, 32px);
  align-items: start;
}

.page-about .chapter-index {
  padding-top: 4px;
}

.page-about .chapter-body > .eyebrow {
  margin-bottom: 12px;
}

.page-about .chapter-body .h-section {
  margin-bottom: 20px;
}

/* ── 01 基础信息 ── */
.page-about .about-kv {
  margin-top: clamp(30px, 5vw, 56px);
  border-top: 1px solid var(--about-hairline);
}

.page-about .about-kv .kv-row {
  display: grid;
  grid-template-columns: minmax(88px, 150px) minmax(0, 1fr);
  gap: 14px 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-hairline);
  align-items: baseline;
}

.page-about .about-kv .kv-key {
  color: var(--text-mute);
  font-size: 12px;
  letter-spacing: .12em;
}

.page-about .about-kv .kv-val {
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
}

/* ── 02 业务线 ── */
.page-about .about-lines .section-head {
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .line-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .line-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background:
    linear-gradient(152deg, rgba(27, 31, 94, .44), rgba(4, 5, 26, .08)),
    var(--void-2);
  transition: border-color .38s var(--ease), transform .38s var(--ease);
}

.page-about .line-item:hover,
.page-about .line-item:focus-within {
  border-color: var(--line-strong);
  transform: translateY(-3px);
}

.page-about .line-num {
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--cyan);
  padding-top: 5px;
}

.page-about .line-main .h-card {
  margin-bottom: 10px;
}

.page-about .line-main .card-text {
  margin-bottom: 14px;
}

/* ── 03 记录与结算 ── */
.page-about .record-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 54px);
  align-items: center;
}

.page-about .record-figure {
  margin: 0;
  position: relative;
}

.page-about .record-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-m) var(--radius-l) var(--radius-m) var(--radius-m);
  border: 1px solid var(--line);
  background: linear-gradient(150deg, var(--void-3), var(--void-2));
}

.page-about .record-figure .media-caption {
  margin-top: 14px;
  color: var(--text-mute);
  font-size: 13px;
  line-height: 1.7;
}

.page-about .record-copy .section-index {
  display: block;
  margin-bottom: 8px;
}

.page-about .record-copy .h-section {
  margin: 12px 0 18px;
}

.page-about .record-facts {
  margin-top: clamp(32px, 5vw, 58px);
}

.page-about .record-fact {
  padding: clamp(20px, 2.6vw, 28px);
  border-top: 2px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(123, 79, 214, .1), transparent 82%);
  border-radius: 0 0 var(--radius-s) var(--radius-s);
}

.page-about .record-fact-label {
  display: block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--text-mute);
  margin-bottom: 12px;
}

.page-about .record-fact-value {
  display: block;
  font-size: clamp(17px, 2.1vw, 21px);
  font-weight: 400;
  color: var(--gold);
  line-height: 1.4;
  margin-bottom: 10px;
}

.page-about .record-fact-note {
  margin: 0;
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1.75;
}

/* ── 04 新用户三步 ── */
.page-about .about-start .section-head {
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .start-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .start-step {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 3vw, 34px) clamp(20px, 2.6vw, 28px);
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: linear-gradient(178deg, rgba(123, 79, 214, .14), rgba(4, 5, 26, .18));
}

.page-about .start-step::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 84px;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.page-about .step-num {
  display: block;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
  margin-bottom: 14px;
}

.page-about .start-step .h-card {
  margin-bottom: 10px;
}

.page-about .start-step .card-text {
  margin: 0;
}

/* ── 05 备案与联系 ── */
.page-about .about-legal .section-head {
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .legal-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 26px);
}

.page-about .legal-card {
  padding: clamp(24px, 3vw, 34px);
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: var(--about-panel);
}

.page-about .legal-card--alt {
  background: linear-gradient(160deg, rgba(27, 31, 94, .5), rgba(4, 5, 26, .12));
  border-color: var(--line-strong);
}

.page-about .legal-card .contact-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .legal-card .contact-row {
  display: grid;
  gap: 5px;
}

.page-about .legal-card .contact-key {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--text-mute);
}

.page-about .legal-card .contact-val {
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.page-about .about-legal .legal-copy {
  margin-top: clamp(26px, 4vw, 40px);
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1.85;
}

.page-about .legal-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 227, 255, .38);
  transition: border-color .3s var(--ease), color .3s var(--ease);
}

.page-about .legal-link:hover,
.page-about .legal-link:focus-visible {
  color: var(--gold);
  border-bottom-color: rgba(230, 201, 141, .6);
}

/* ── 响应式 ── */
@media (min-width: 640px) {
  .page-about .legal-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .line-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .chapter {
    grid-template-columns: minmax(110px, 170px) minmax(0, 1fr);
    gap: clamp(24px, 3.4vw, 48px);
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }

  .page-about .record-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .86fr);
  }
}

@media (max-width: 520px) {
  .page-about .about-kv .kv-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .page-about .line-item {
    grid-template-columns: 1fr;
  }

  .page-about .line-num {
    padding-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .line-item,
  .page-about .legal-link {
    transition: none;
  }
}