.page-app-download {
  --adl-hairline: max(1px, calc(var(--border-thin) / 2));
  --adl-num-size: calc(var(--text-figure) * 0.52);
  overflow-x: clip;
  background: var(--color-surface);
  color: var(--color-ink);
}

/* ---------- 面包屑 ---------- */
.page-app-download .adl-crumbs {
  padding-top: var(--space-3);
  padding-bottom: var(--space-2);
}

/* ---------- 首屏 ---------- */
.page-app-download .adl-hero {
  position: relative;
  overflow: hidden;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: var(--space-6) var(--space-8);
}

.page-app-download .adl-hero__cut {
  position: absolute;
  right: -4%;
  bottom: 0;
  width: min(78%, 720px);
  height: 72%;
  background: var(--color-primary);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  opacity: .92;
  pointer-events: none;
}

.page-app-download .adl-hero__glow {
  position: absolute;
  left: -10%;
  bottom: -14%;
  width: 58%;
  height: 54%;
  background: var(--color-accent);
  clip-path: polygon(0 26%, 100% 0, 100% 100%, 0 100%);
  opacity: .26;
  pointer-events: none;
}

.page-app-download .adl-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-4);
}

.page-app-download .adl-hero__copy .eyebrow {
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}

.page-app-download .adl-hero__title {
  margin: var(--space-2) 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--color-contrast-ink);
}

.page-app-download .adl-hero__lede {
  max-width: 44ch;
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent);
}

.page-app-download .adl-hero__stats {
  list-style: none;
  margin: 0;
  padding: var(--space-3) 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-app-download .adl-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--adl-num-size);
  line-height: 1;
  letter-spacing: -0.03em;
  color: color-mix(in srgb, var(--color-primary) 58%, var(--color-primary-ink));
}

.page-app-download .adl-stat__label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  line-height: 1.4;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

.page-app-download .adl-hero__media {
  position: relative;
  margin: 0;
}

.page-app-download .adl-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-md);
  clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
  filter: grayscale(.45) contrast(1.08) sepia(.12);
}

.page-app-download .adl-hero__media figcaption {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

/* ---------- 通用区块头 ---------- */
.page-app-download .adl-head {
  max-width: 64ch;
}

.page-app-download .adl-head .section__title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: -0.03em;
}

.page-app-download .adl-head--on-primary .eyebrow {
  color: color-mix(in srgb, var(--color-primary-ink) 78%, transparent);
}

.page-app-download .adl-head--on-primary .section__title,
.page-app-download .adl-head--on-primary .lede {
  color: var(--color-primary-ink);
}

.page-app-download .adl-head--on-primary .lede {
  opacity: .9;
}

/* ---------- 通道陈列 ---------- */
.page-app-download .adl-channels {
  background: var(--color-surface);
  padding-block: var(--section-y);
}

.page-app-download .adl-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: var(--space-4) 0 var(--space-6);
}

.page-app-download .adl-channels__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.page-app-download .adl-chan {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.page-app-download .adl-chan__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .adl-chan .idx {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-accent);
}

.page-app-download .adl-chan__name {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: -0.03em;
}

.page-app-download .adl-chan__what {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .adl-chan__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-md);
}

.page-app-download .adl-chan__media img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 280px;
  object-fit: cover;
  filter: grayscale(.4) sepia(.16) contrast(1.06);
}

.page-app-download .adl-chan__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--color-primary);
  mix-blend-mode: multiply;
  opacity: .18;
  pointer-events: none;
}

.page-app-download .adl-chan__spec {
  margin: 0;
  display: grid;
  gap: var(--space-2);
  font-size: var(--text-sm);
}

.page-app-download .adl-chan__row {
  display: grid;
  grid-template-columns: 5.5em minmax(0, 1fr);
  gap: var(--space-2);
  padding-top: var(--space-2);
  border-top: var(--adl-hairline) solid var(--color-line);
}

.page-app-download .adl-chan__row dt {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-app-download .adl-chan__row dd {
  margin: 0;
  line-height: 1.6;
  color: var(--color-ink);
}

/* ---------- 安装准备 ---------- */
.page-app-download .adl-prep {
  background: var(--color-surface-alt);
  padding-block: var(--section-y);
}

.page-app-download .adl-prep__body {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.page-app-download .adl-checks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.page-app-download .adl-check__row {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-left: var(--space-1) solid var(--color-accent);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color .16s ease, background .16s ease;
}

.page-app-download .adl-check__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-app-download .adl-check__mark {
  width: var(--space-3);
  height: var(--space-3);
  display: grid;
  place-items: center;
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  transition: background .16s ease, border-color .16s ease;
}

.page-app-download .adl-check__mark::after {
  content: "";
  width: 42%;
  height: 22%;
  border-left: var(--border-thin) solid var(--color-primary-ink);
  border-bottom: var(--border-thin) solid var(--color-primary-ink);
  transform: rotate(-42deg) translate(6%, -18%);
  opacity: 0;
  transition: opacity .16s ease;
}

.page-app-download .adl-check__input:checked + .adl-check__mark {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.page-app-download .adl-check__input:checked + .adl-check__mark::after {
  opacity: 1;
}

.page-app-download .adl-check__input:checked ~ .adl-check__text .adl-check__title {
  color: var(--color-ink-muted);
  text-decoration: line-through;
}

.page-app-download .adl-check__input:focus-visible + .adl-check__mark {
  outline: var(--border-thin) solid var(--color-focus);
  outline-offset: 2px;
}

.page-app-download .adl-check__text {
  display: grid;
  gap: var(--space-1);
}

.page-app-download .adl-check__title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.page-app-download .adl-check__desc {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .adl-prep__media {
  align-self: start;
}

.page-app-download .adl-prep__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-line);
  object-fit: cover;
}

.page-app-download .adl-prep__media .media__caption {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

/* ---------- 换设备重登 ---------- */
.page-app-download .adl-relogin {
  position: relative;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  padding-block: calc(var(--section-y) + var(--space-3));
  clip-path: polygon(0 2.2%, 100% 0, 100% 97.8%, 0 100%);
}

.page-app-download .adl-steps {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.page-app-download .adl-step {
  position: relative;
  padding: var(--space-3);
  background: var(--color-surface);
  color: var(--color-ink);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
}

.page-app-download .adl-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--adl-num-size);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--color-primary);
}

.page-app-download .adl-step__title {
  margin: var(--space-2) 0 var(--space-1);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  letter-spacing: -0.02em;
}

.page-app-download .adl-step__desc {
  margin: 0 0 var(--space-2);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .adl-step__more {
  border-top: var(--adl-hairline) solid var(--color-line);
  padding-top: var(--space-1);
}

.page-app-download .adl-step__more summary {
  position: relative;
  padding-right: var(--space-3);
  cursor: pointer;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  color: var(--color-accent);
  list-style: none;
}

.page-app-download .adl-step__more summary::-webkit-details-marker {
  display: none;
}

.page-app-download .adl-step__more summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-family: var(--font-mono);
  color: var(--color-primary);
}

.page-app-download .adl-step__more[open] summary::after {
  content: "–";
}

.page-app-download .adl-step__more p {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 求助与出口 ---------- */
.page-app-download .adl-help {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: var(--section-y);
}

.page-app-download .adl-help__grid {
  display: grid;
  gap: var(--space-6);
}

.page-app-download .adl-eyebrow--on-dark {
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
}

.page-app-download .adl-help__title {
  margin: var(--space-2) 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: -0.03em;
  color: var(--color-contrast-ink);
}

.page-app-download .adl-help__main p {
  margin: 0 0 var(--space-2);
  max-width: 62ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent);
}

.page-app-download .adl-help__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
  align-content: start;
}

.page-app-download .adl-help__list li {
  padding: var(--space-3);
  border: var(--adl-hairline) solid var(--color-contrast-line);
  border-left: var(--space-1) solid var(--color-primary);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-contrast-ink) 6%, transparent);
}

.page-app-download .adl-help__list p {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
}

.page-app-download .adl-next {
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: var(--adl-hairline) solid var(--color-contrast-line);
}

.page-app-download .adl-next p {
  margin: 0 0 var(--space-2);
  max-width: 70ch;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

.page-app-download .adl-link {
  color: var(--color-contrast-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: var(--adl-hairline);
}

.page-app-download .adl-link:hover {
  color: var(--color-contrast-ink);
}

/* ---------- 交互与响应式 ---------- */
@media (hover: hover) {
  .page-app-download .adl-chan:hover {
    transform: translate(-2px, -2px);
    border-color: var(--color-accent);
    box-shadow: var(--shadow-1);
  }

  .page-app-download .adl-check__row:hover {
    background: var(--color-highlight);
  }

  .page-app-download .adl-help__list li:hover {
    border-left-color: var(--color-contrast-accent);
  }
}

@media (min-width: 720px) {
  .page-app-download .adl-channels__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4) var(--space-3);
  }

  .page-app-download .adl-help__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-app-download .adl-hero {
    padding-block: var(--space-8) calc(var(--section-y-lg));
  }

  .page-app-download .adl-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    grid-template-areas:
      "copy media"
      "stats media";
    align-items: start;
    column-gap: var(--space-6);
    row-gap: var(--space-4);
  }

  .page-app-download .adl-hero__copy {
    grid-area: copy;
  }

  .page-app-download .adl-hero__stats {
    grid-area: stats;
  }

  .page-app-download .adl-hero__media {
    grid-area: media;
  }

  .page-app-download .adl-chan:nth-child(even) {
    margin-top: var(--space-6);
  }

  .page-app-download .adl-prep__body {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-6);
    align-items: start;
  }

  .page-app-download .adl-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-3);
  }

  .page-app-download .adl-step:nth-child(2) {
    transform: translateY(var(--space-3));
  }

  .page-app-download .adl-step:nth-child(3) {
    transform: translateY(calc(var(--space-3) * 2));
  }

  .page-app-download .adl-help__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: var(--space-6);
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-app-download .adl-channels__list {
    gap: var(--space-6) var(--space-4);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-app-download .adl-chan,
  .page-app-download .adl-check__row,
  .page-app-download .adl-check__mark,
  .page-app-download .adl-check__mark::after {
    transition: none;
  }

  .page-app-download .adl-chan:hover {
    transform: none;
  }

  .page-app-download .adl-step:nth-child(2),
  .page-app-download .adl-step:nth-child(3) {
    transform: none;
  }
}