.page-about {
  --about-panel-bg: #1E2029;
  --about-panel-edge: #2E3240;
  --about-soft: rgba(192, 199, 209, 0.08);
}

/* ---------- Hero ---------- */

.page-about .page-about__hero {
  position: relative;
  padding: clamp(72px, 9vw, 132px) 0 clamp(56px, 7vw, 96px);
  background: var(--ink);
  overflow: hidden;
}

.page-about .page-about__hero::before {
  content: "";
  position: absolute;
  inset: auto -25% -35% -25%;
  height: 70%;
  background:
    radial-gradient(ellipse at 32% 45%, rgba(74, 30, 109, 0.58), transparent 62%),
    radial-gradient(ellipse at 78% 20%, rgba(0, 229, 199, 0.08), transparent 58%);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-hero__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  margin-top: clamp(24px, 3.6vw, 48px);
}

.page-about .about-hero__main {
  max-width: 720px;
}

.page-about .about-hero__main .display-title {
  margin: 12px 0 22px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .about-overview {
  position: relative;
  align-self: start;
  padding: clamp(20px, 2.8vw, 30px);
  background: linear-gradient(160deg, #1F2130 0%, #191A22 100%);
  border: 1px solid var(--about-panel-edge);
  border-left: 3px solid var(--grape);
}

.page-about .about-overview__title {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--silver);
}

.page-about .about-overview__list {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-overview__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-panel-edge);
}

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

.page-about .about-overview__row dt {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.page-about .about-overview__row dd {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
}

.page-about .about-overview__note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 01 品牌起点 ---------- */

.page-about .about-origin {
  background: var(--ink);
}

.page-about .about-origin__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-origin__body p {
  margin: 0 0 18px;
  max-width: 38em;
  color: var(--silver);
  font-size: 17px;
  line-height: 1.75;
}

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

.page-about .about-origin__points {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .about-origin__points li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 18px;
  background: var(--about-panel-bg);
  border: 1px solid var(--about-panel-edge);
}

.page-about .about-origin__points li p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--silver);
}

.page-about .about-origin__num {
  flex: 0 0 auto;
  font-size: 13px;
  color: var(--cyan);
  letter-spacing: 0.08em;
  padding-top: 3px;
}

/* ---------- 02 时间轴 ---------- */

.page-about .about-timeline {
  background: linear-gradient(180deg, #14151A 0%, #171821 100%);
}

.page-about .about-timeline__banner {
  margin: 0 0 clamp(32px, 5vw, 60px);
}

.page-about .about-timeline__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
}

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: clamp(22px, 3.2vw, 34px) 0;
  border-top: 1px solid var(--about-panel-edge);
  position: relative;
}

.page-about .about-timeline__item:last-child {
  border-bottom: 1px solid var(--about-panel-edge);
}

.page-about .about-timeline__year {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--ivory);
  letter-spacing: -0.01em;
}

.page-about .about-timeline__year::before {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--grape);
  box-shadow:
    0 0 0 4px rgba(74, 30, 109, 0.32),
    0 0 18px rgba(0, 229, 199, 0.32);
}

.page-about .about-timeline__body h3 {
  margin: 0 0 8px;
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 700;
  color: var(--ivory);
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 38em;
  color: var(--silver);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .about-timeline__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 199, 0.4);
}

.page-about .about-timeline__body a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 03 版本体系 ---------- */

.page-about .about-tiers {
  background: var(--ink);
}

.page-about .about-tiers__banner {
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-about .about-tier-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 28px);
}

.page-about .about-tier {
  display: grid;
  gap: 12px;
  align-content: start;
  padding: clamp(22px, 3vw, 30px);
  background: var(--about-panel-bg);
  border: 1px solid var(--about-panel-edge);
  border-top: 3px solid var(--grape);
}

.page-about .about-tier:nth-child(2) {
  border-top-color: var(--violet);
}

.page-about .about-tier:nth-child(3) {
  border-top-color: var(--cyan);
}

.page-about .about-tier__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .about-tier__name {
  margin: 0;
  font-size: clamp(20px, 2.2vw, 24px);
  font-weight: 700;
  color: var(--ivory);
}

.page-about .about-tier__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .about-tier__list {
  margin: 6px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-about .about-tier__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--silver);
}

.page-about .about-tier__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-tiers__foot {
  margin: clamp(24px, 3vw, 36px) 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-tiers__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 199, 0.4);
}

.page-about .about-tiers__foot a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 04 费用节奏 ---------- */

.page-about .about-rate {
  background: linear-gradient(180deg, #171821 0%, #14151A 100%);
}

.page-about .about-rate__panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 48px);
  padding: clamp(24px, 3.6vw, 44px);
  background: linear-gradient(135deg, #1E2029 0%, #1A1B23 100%);
  border: 1px solid var(--about-panel-edge);
}

.page-about .about-rate__copy p {
  margin: 0 0 16px;
  max-width: 38em;
  color: var(--silver);
  font-size: 16px;
  line-height: 1.75;
}

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

.page-about .about-rate__link {
  color: var(--muted);
  font-size: 14px;
}

.page-about .about-rate__link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 199, 0.4);
}

.page-about .about-rate__link a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-rate__stats {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 18px;
  align-content: start;
}

.page-about .about-rate__stat {
  padding-left: 14px;
  border-left: 2px solid var(--amber);
}

.page-about .about-rate__stat-num {
  display: block;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-rate__stat-label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 05 旧版归档 ---------- */

.page-about .about-archive {
  background: var(--ink);
}

.page-about .about-archive__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 44px);
}

.page-about .about-archive__card {
  padding: clamp(24px, 3.2vw, 36px);
  background: var(--about-panel-bg);
  border: 1px solid var(--about-panel-edge);
  border-left: 3px solid var(--grape);
}

.page-about .about-archive__tag {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-archive__card h3 {
  margin: 0 0 14px;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  color: var(--ivory);
}

.page-about .about-archive__card p {
  margin: 0 0 14px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--silver);
}

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

.page-about .about-archive__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-archive__steps li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 18px;
  border: 1px solid var(--about-panel-edge);
  background: rgba(30, 32, 41, 0.6);
}

.page-about .about-archive__steps li p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--silver);
}

.page-about .about-archive__step-idx {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--amber);
  padding-top: 3px;
}

/* ---------- 06 团队与服务网络 ---------- */

.page-about .about-network {
  background: linear-gradient(180deg, #14151A 0%, #171821 100%);
}

.page-about .about-network__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-network__block {
  padding: 0 0 20px;
  margin: 0 0 20px;
  border-bottom: 1px solid var(--about-panel-edge);
}

.page-about .about-network__block:last-of-type {
  border-bottom: 0;
  padding-bottom: 0;
  margin-bottom: 0;
}

.page-about .about-network__block h3 {
  margin: 0 0 8px;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  color: var(--ivory);
}

.page-about .about-network__block p {
  margin: 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .about-network__cta {
  margin: 24px 0 0;
}

.page-about .about-network__cta a {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 199, 0.4);
  padding-bottom: 2px;
}

.page-about .about-network__cta a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-network__media {
  margin: 0;
  align-self: start;
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .about-origin__layout {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
    padding: clamp(28px, 3.4vw, 40px) 0;
    align-items: start;
  }

  .page-about .about-timeline__year {
    position: sticky;
    top: 96px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.75fr);
    align-items: end;
  }

  .page-about .about-rate__panel {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
  }

  .page-about .about-archive__layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-network__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
  }
}

@media (min-width: 1100px) {
  .page-about .about-timeline__item {
    grid-template-columns: 240px minmax(0, 1fr);
  }
}

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