.page-about {
  display: block;
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 32px) 0 44px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -18%;
  width: min(680px, 92vw);
  height: min(680px, 92vw);
  background: radial-gradient(circle at 42% 42%, rgba(57, 230, 242, 0.17), rgba(122, 77, 255, 0.08) 42%, transparent 66%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -14%;
  bottom: -34%;
  width: 74%;
  height: 62%;
  background: linear-gradient(118deg, rgba(59, 30, 110, 0.85), rgba(10, 15, 44, 0));
  clip-path: polygon(0 44%, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 24px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: clamp(30px, 7.2vw, 54px);
  line-height: 1.16;
  letter-spacing: 0.012em;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: 0 0 26px;
  max-width: 56ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink-90);
}

.page-about .about-hero__actions {
  flex-wrap: wrap;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(59, 30, 110, 0.55), rgba(10, 15, 44, 0.75));
  box-shadow: var(--shadow-hover);
}

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

/* ===== 主体骨架 ===== */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding-bottom: 72px;
}

.page-about .about-main {
  min-width: 0;
}

.page-about .about-block {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-toc {
  position: relative;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(59, 30, 110, 0.34), rgba(10, 15, 44, 0.25));
}

.page-about .about-toc .toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .about-toc .toc__link {
  display: inline-block;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-70);
  text-decoration: none;
  transition: color 0.25s ease, border-color 0.25s ease, background-color 0.25s ease;
}

.page-about .about-toc .toc__link:hover,
.page-about .about-toc .toc__link:focus-visible {
  color: var(--white);
  border-color: var(--line-strong);
}

.page-about .about-toc .toc__link[aria-current="true"] {
  color: var(--space-void);
  background: var(--neon);
  border-color: var(--neon);
}

/* ===== 品牌自述 ===== */
.page-about .about-prose p {
  margin: 0 0 18px;
  color: var(--ink-90);
  font-size: 16px;
  line-height: 1.9;
}

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

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-facts__item {
  padding: 18px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .about-facts__unit {
  margin-left: 2px;
  font-size: 14px;
  color: var(--ink-70);
}

.page-about .about-facts__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--ink-70);
}

/* ===== 栏目地图 ===== */
.page-about .about-map-figure,
.page-about .about-steps-figure {
  margin: 0 0 28px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(59, 30, 110, 0.48), rgba(10, 15, 44, 0.7));
}

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

.page-about .about-figure__caption {
  padding: 14px 20px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-70);
  border-top: 1px solid var(--line);
}

.page-about .about-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  display: grid;
  gap: 16px;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, rgba(57, 230, 242, 0.55), rgba(255, 184, 77, 0.35), rgba(57, 230, 242, 0.06));
}

.page-about .about-track__item {
  position: relative;
  padding: 20px 20px 18px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--panel);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 28px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--space-void);
  border: 2px solid var(--neon);
}

.page-about .about-track__item:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-hover);
}

.page-about .about-track__index {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--neon);
}

.page-about .about-track__title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 20px;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-track__link {
  color: var(--white);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-track__link:hover,
.page-about .about-track__link:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

.page-about .about-track__chip {
  font-size: 11px;
}

.page-about .about-track__text {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-90);
}

.page-about .about-track__why {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-50);
}

/* ===== 首访四步 ===== */
.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-step {
  position: relative;
  overflow: hidden;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--neon), rgba(255, 184, 77, 0.85));
  opacity: 0.45;
  transition: opacity 0.3s ease;
}

.page-about .about-step:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-hover);
}

.page-about .about-step:hover::before {
  opacity: 1;
}

.page-about .about-step .card__body {
  font-size: 14px;
  line-height: 1.85;
}

.page-about .about-step__link {
  display: inline-block;
  margin-left: 4px;
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 230, 242, 0.45);
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-step__link:hover,
.page-about .about-step__link:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* ===== 术语小抄 ===== */
.page-about .about-terms {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-term {
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  transition: border-color 0.25s ease;
}

.page-about .about-term:hover {
  border-color: var(--line-strong);
}

.page-about .about-term .fold__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-term .fold__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-term .fold__summary::after {
  content: "＋";
  flex: none;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--neon);
}

.page-about .about-term[open] .fold__summary::after {
  content: "－";
  color: var(--gold);
}

.page-about .about-term .fold__body {
  padding: 0 20px 18px;
}

.page-about .about-term .fold__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-70);
}

/* ===== 接下来去哪 ===== */
.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-next-card {
  position: relative;
  padding: 26px 24px 24px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(27, 58, 140, 0.4), rgba(10, 15, 44, 0.55));
}

.page-about .about-next-card--gold {
  background: linear-gradient(160deg, rgba(255, 184, 77, 0.16), rgba(10, 15, 44, 0.6));
  border-color: rgba(255, 184, 77, 0.32);
}

.page-about .about-next-card__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--neon);
}

.page-about .about-next-card--gold .about-next-card__eyebrow {
  color: var(--gold);
}

.page-about .about-next-card__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 21px;
  line-height: 1.45;
  color: var(--white);
}

.page-about .about-next-card__text {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-90);
}

.page-about .about-tail {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .about-tail__link {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 230, 242, 0.4);
}

.page-about .about-tail__link:hover,
.page-about .about-tail__link:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* ===== 中屏 ===== */
@media (min-width: 620px) {
  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 52px);
    padding-bottom: 60px;
  }

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

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

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

  .page-about .about-toc .toc__list {
    gap: 8px 12px;
  }
}

/* ===== 桌面：左轨道 + 右正文 ===== */
@media (min-width: 980px) {
  .page-about .about-hero {
    padding-bottom: 76px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 56px;
    align-items: center;
    margin-top: 34px;
  }

  .page-about .about-hero__media {
    transform: translateY(-14px) rotate(-1.4deg);
  }

  .page-about .about-layout {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 56px;
    padding-bottom: 96px;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    padding: 22px 20px;
  }

  .page-about .about-toc .toc__list {
    flex-direction: column;
    gap: 6px;
  }

  .page-about .about-toc .toc__link {
    display: block;
    border-color: transparent;
    background: transparent;
    padding: 7px 12px;
  }

  .page-about .about-toc .toc__link:hover,
  .page-about .about-toc .toc__link:focus-visible {
    background: rgba(57, 230, 242, 0.08);
    border-color: transparent;
  }

  .page-about .about-toc .toc__link[aria-current="true"] {
    color: var(--white);
    background: rgba(57, 230, 242, 0.14);
    border-color: transparent;
    box-shadow: inset 3px 0 0 var(--neon);
  }
}

/* ===== 宽屏微调 ===== */
@media (min-width: 1240px) {
  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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