.page-products {
  --pf-head-gap: clamp(1.5rem, 4vw, 2.5rem);
  --pf-radius: var(--r-lg);
  background: var(--ink-900);
  color: var(--mist);
  overflow-x: hidden;
}

.page-products .section {
  padding-block: clamp(2.5rem, 7vw, 5.5rem);
}

.page-products .chapter-band {
  margin-inline: auto;
}

/* ---------- 首屏 ---------- */

.page-products .pf-hero {
  padding-block: clamp(1.75rem, 5vw, 3.5rem) clamp(2rem, 6vw, 4rem);
  background:
    radial-gradient(120% 90% at 78% 18%, rgba(122, 92, 255, .18) 0%, transparent 58%),
    radial-gradient(90% 70% at 12% 82%, rgba(34, 224, 214, .12) 0%, transparent 62%);
}

.page-products .pf-hero__inner {
  display: grid;
  gap: clamp(2rem, 5vw, 3rem);
  align-items: center;
}

.page-products .pf-eyebrow {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .18em;
  color: var(--neon);
  text-transform: uppercase;
}

.page-products .pf-hero__title {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2rem, 6.4vw, 4.2rem);
  line-height: 1.14;
  letter-spacing: .015em;
  color: var(--paper);
  max-width: 20ch;
}

.page-products .pf-hero__lead {
  margin: 0 0 1.6rem;
  max-width: 36ch;
  font-size: clamp(.98rem, 1.4vw, 1.08rem);
  line-height: 1.85;
  color: var(--mist);
}

.page-products .pf-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

.page-products .pf-hero__foot {
  margin: 1.35rem 0 0;
  font-size: .85rem;
  line-height: 1.7;
  color: rgba(184, 194, 217, .72);
  max-width: 34ch;
}

.page-products .pf-echo {
  width: 100%;
  max-width: 420px;
  margin-inline: auto;
  aspect-ratio: 1 / 1;
}

.page-products .pf-echo__svg {
  display: block;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.page-products .pf-echo__rings {
  transform-origin: 200px 200px;
  animation: pf-breathe 7.5s var(--ease) infinite;
}

.page-products .pf-echo__core {
  transform-origin: 200px 200px;
  animation: pf-breathe 5.2s var(--ease) infinite reverse;
}

.page-products .pf-echo__ticks line {
  animation: pf-tick 3.6s ease-in-out infinite;
}

.page-products .pf-echo__ticks line:nth-child(2) { animation-delay: .6s; }
.page-products .pf-echo__ticks line:nth-child(3) { animation-delay: 1.2s; }
.page-products .pf-echo__ticks line:nth-child(4) { animation-delay: 1.8s; }

@keyframes pf-breathe {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.028); }
}

@keyframes pf-tick {
  0%, 100% { opacity: .35; }
  50% { opacity: 1; }
}

/* ---------- 章节索引条 ---------- */

.page-products .pf-index {
  border-block: 1px solid var(--line);
  background: rgba(12, 18, 32, .72);
}

.page-products .pf-index__list {
  display: flex;
  gap: .55rem;
  margin: 0;
  padding: .7rem 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-products .pf-index__list::-webkit-scrollbar {
  display: none;
}

.page-products .pf-index__list .index-link {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  flex: 0 0 auto;
  padding: .45rem .9rem;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  font-size: .82rem;
  color: var(--mist);
  text-decoration: none;
  transition: border-color .3s var(--ease), color .3s var(--ease), background .3s var(--ease);
}

.page-products .pf-index__list .index-link:hover,
.page-products .pf-index__list .index-link:focus-visible {
  border-color: var(--line-strong);
  color: var(--neon);
  background: var(--neon-dim);
}

.page-products .pf-index__list .index-num {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--amber);
}

/* ---------- 章节标题通用 ---------- */

.page-products .pf-head {
  max-width: 46rem;
}

.page-products .chapter-title {
  margin: .5rem 0 .9rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.8vw, 2.35rem);
  line-height: 1.28;
  letter-spacing: .012em;
  color: var(--paper);
}

.page-products .chapter-lead {
  margin: 0;
  max-width: 38ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-products .chapter-lead a,
.page-products .pf-steps__tail a,
.page-products .pf-secure-item__text a {
  color: var(--neon);
  text-decoration: underline;
  text-decoration-color: rgba(34, 224, 214, .4);
  text-underline-offset: 3px;
}

/* ---------- 三列对照台 ---------- */

.page-products .pf-compare__grid {
  display: grid;
  gap: 1px;
  margin-top: var(--pf-head-gap);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background: var(--line);
  overflow: hidden;
}

.page-products .pf-col {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  padding: clamp(1.4rem, 3vw, 2.1rem);
  background: var(--ink-800);
  transition: background .35s var(--ease);
}

.page-products .pf-col:hover {
  background: var(--ink-700);
}

.page-products .pf-col::before {
  content: "";
  display: block;
  width: 38px;
  height: 3px;
  margin-bottom: .85rem;
  border-radius: var(--pill);
  background: linear-gradient(90deg, var(--neon), var(--violet));
}

.page-products .pf-col__head {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--amber);
}

.page-products .pf-col__value {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.85rem, 4.6vw, 2.7rem);
  line-height: 1.08;
  color: var(--amber);
}

.page-products .pf-col__label {
  margin: 0;
  font-size: .92rem;
  color: var(--paper);
}

.page-products .pf-col__note {
  margin: .35rem 0 0;
  font-size: .88rem;
  line-height: 1.8;
  color: rgba(184, 194, 217, .82);
}

.page-products .pf-compare__figure {
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  aspect-ratio: 16 / 8;
  border-radius: var(--r-xl);
  overflow: hidden;
}

/* ---------- 注册三步 ---------- */

.page-products .pf-steps__media {
  margin: 0 0 clamp(1.75rem, 4vw, 2.75rem);
  aspect-ratio: 14 / 9;
  border-radius: var(--r-xl);
  overflow: hidden;
}

.page-products .pf-steps__list {
  display: grid;
  gap: 1rem;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-products .pf-step {
  position: relative;
  padding: 1.5rem 1.4rem 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--pf-radius);
  background: linear-gradient(160deg, rgba(20, 28, 51, .95), rgba(12, 18, 32, .95));
}

.page-products .pf-step__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  margin-bottom: .9rem;
  border-radius: var(--pill);
  font-family: var(--font-mono);
  font-size: .95rem;
  font-weight: 700;
  color: var(--ink-900);
  background: linear-gradient(140deg, var(--neon), var(--violet));
}

.page-products .pf-step__title {
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  color: var(--paper);
}

.page-products .pf-step__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.85;
  color: rgba(184, 194, 217, .86);
}

.page-products .pf-step__hint {
  margin: 1rem 0 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--neon);
}

.page-products .pf-steps__tail {
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding-left: 1rem;
  border-left: 2px solid var(--line-strong);
  max-width: 40ch;
  font-size: .9rem;
  line-height: 1.85;
  color: rgba(184, 194, 217, .8);
}

/* ---------- 跨端衔接 ---------- */

.page-products .pf-bridge__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
  align-items: center;
}

.page-products .pf-bridge__copy .chapter-title {
  margin-top: .5rem;
}

.page-products .pf-bridge__text {
  margin: 0 0 1rem;
  max-width: 37ch;
  font-size: .96rem;
  line-height: 1.9;
  color: var(--mist);
}

.page-products .pf-bridge__note {
  margin-top: 1.4rem;
  padding: 1.2rem 1.3rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--pulse);
  border-radius: var(--r-md);
  background: rgba(255, 92, 122, .06);
}

.page-products .pf-bridge__note-title {
  margin: 0 0 .5rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--pulse);
}

.page-products .pf-bridge__note-text {
  margin: 0;
  font-size: .88rem;
  line-height: 1.8;
  color: rgba(184, 194, 217, .86);
}

.page-products .pf-bridge__media {
  margin: 0;
  aspect-ratio: 4 / 3;
  border-radius: var(--r-xl);
  overflow: hidden;
}

/* ---------- 包体与设备 ---------- */

.page-products .pf-packages__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
  margin-top: var(--pf-head-gap);
}

.page-products .pf-packages__media {
  margin: 0;
  aspect-ratio: 5 / 3;
  border-radius: var(--r-xl);
  overflow: hidden;
}

.page-products .pf-bars {
  display: grid;
  gap: 1.6rem;
}

.page-products .pf-bar__meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: .6rem;
}

.page-products .pf-bar__name {
  font-size: .95rem;
  color: var(--paper);
}

.page-products .pf-bar__size {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--amber);
}

.page-products .pf-bar__track {
  height: 12px;
  border-radius: var(--pill);
  background: rgba(184, 194, 217, .12);
  overflow: hidden;
}

.page-products .pf-bar__fill {
  display: block;
  height: 100%;
  border-radius: var(--pill);
  transform-origin: left center;
}

.page-products .pf-bar__fill--full {
  width: 100%;
  background: linear-gradient(90deg, var(--neon), var(--violet));
}

.page-products .pf-bar__fill--lite {
  width: 36%;
  background: linear-gradient(90deg, var(--teal-deep), var(--neon));
}

.page-products .pf-bar__note {
  margin: .7rem 0 0;
  font-size: .87rem;
  line-height: 1.8;
  color: rgba(184, 194, 217, .82);
}

.page-products .pf-specs {
  display: grid;
  gap: .85rem;
  margin: 1.8rem 0 0;
  padding: 0;
  list-style: none;
}

.page-products .pf-spec {
  display: grid;
  gap: .3rem;
  padding: .95rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(20, 28, 51, .6);
}

.page-products .pf-spec__key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--violet);
}

.page-products .pf-spec__val {
  margin: 0;
  font-size: .88rem;
  line-height: 1.8;
  color: rgba(184, 194, 217, .86);
}

/* ---------- 版本节奏 ---------- */

.page-products .pf-timeline {
  display: grid;
  gap: 1rem;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: pf-time;
}

.page-products .pf-timeline__item {
  position: relative;
  padding: 1.4rem 1.35rem 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--pf-radius);
  background: var(--ink-800);
}

.page-products .pf-timeline__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 1.35rem;
  right: 1.35rem;
  height: 2px;
  border-radius: var(--pill);
  background: linear-gradient(90deg, var(--neon), var(--violet), transparent);
}

.page-products .pf-timeline__mark {
  margin: 0 0 .55rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--amber);
}

.page-products .pf-timeline__title {
  margin: 0 0 .55rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--paper);
}

.page-products .pf-timeline__text {
  margin: 0;
  font-size: .89rem;
  line-height: 1.82;
  color: rgba(184, 194, 217, .84);
}

/* ---------- 账号安全 ---------- */

.page-products .pf-security {
  background:
    radial-gradient(80% 60% at 88% 30%, rgba(34, 224, 214, .1) 0%, transparent 60%),
    var(--ink-800);
}

.page-products .pf-security__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
  align-items: center;
}

.page-products .pf-security__text {
  margin: 0 0 1.5rem;
  max-width: 37ch;
  font-size: .96rem;
  line-height: 1.9;
  color: var(--mist);
}

.page-products .pf-secure-list {
  display: grid;
  gap: .9rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-products .pf-secure-item {
  padding-left: 1.15rem;
  border-left: 2px solid var(--line-strong);
}

.page-products .pf-secure-item__title {
  margin: 0 0 .3rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .98rem;
  color: var(--paper);
}

.page-products .pf-secure-item__text {
  margin: 0;
  font-size: .87rem;
  line-height: 1.8;
  color: rgba(184, 194, 217, .84);
}

.page-products .pf-security__media {
  margin: 0;
  aspect-ratio: 1 / 1;
  border-radius: var(--r-xl);
  overflow: hidden;
}

/* ---------- 图片通用 ---------- */

.page-products .media__img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 自适应 ---------- */

@media (min-width: 720px) {
  .page-products .pf-compare__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-products .pf-steps__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-products .pf-step::after {
    content: "";
    position: absolute;
    top: 2.4rem;
    left: 100%;
    width: 1.25rem;
    height: 1px;
    background: linear-gradient(90deg, var(--neon), transparent);
  }

  .page-products .pf-step:last-child::after {
    display: none;
  }

  .page-products .pf-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }
}

@media (min-width: 900px) {
  .page-products .pf-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
  }

  .page-products .pf-hero__lead {
    max-width: 38ch;
  }

  .page-products .pf-bridge__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-products .pf-packages__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }

  .page-products .pf-security__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }

  .page-products .pf-security__media {
    justify-self: end;
    max-width: 420px;
    width: 100%;
  }
}

@media (min-width: 1100px) {
  .page-products .pf-head {
    padding-left: 4.5rem;
    position: relative;
  }

  .page-products .pf-head .chapter-index {
    position: absolute;
    left: 0;
    top: .35rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-products .pf-echo__rings,
  .page-products .pf-echo__core,
  .page-products .pf-echo__ticks line {
    animation: none;
  }

  .page-products .pf-bar__fill {
    transform: none;
  }
}
<<<END>>>