.sa-compression-detail {
  --sa-compression-blue: var(--sa-accent, #0ea5e9);
  color: var(--sa-primary, #0f172a);
  background: #fff;
}

.sa-compression-detail .section-kicker {
  margin: 0 0 10px;
  color: #0786ce;
  font-size: 12px;
  font-weight: 750;
  letter-spacing: .09em;
  line-height: 1.2;
}

.sa-compression-detail :where(h1, h2, h3, p, figure, dl, dd) {
  margin: 0;
}

.sa-compression-detail .btn-outline {
  border-color: #cfd7e2;
  color: var(--sa-primary, #0f172a);
  background: #fff;
}

.sa-compression-detail .btn-outline:hover,
.sa-compression-detail .btn-outline:focus-visible {
  border-color: var(--sa-primary, #0f172a);
  color: var(--sa-primary, #0f172a);
  background: #f8fafc;
  transform: translateY(-1px);
}

.sa-compression-hero {
  padding: 32px 0 56px;
  overflow: hidden;
  border-bottom: 1px solid #edf0f4;
  background: linear-gradient(90deg, #fff 0%, #fff 58%, #fbfcfd 100%);
}

.sa-compression-hero__inner {
  display: grid;
  min-height: 470px;
  align-items: center;
  grid-template-columns: minmax(0, .9fr) minmax(520px, 1.1fr);
  gap: clamp(52px, 7vw, 112px);
}

.sa-compression-hero__copy {
  max-width: 610px;
}

.sa-compression-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 38px;
  gap: 8px;
  color: var(--sa-text-muted, #9ca3af);
  font-size: 12px;
}

.sa-compression-breadcrumb a {
  color: var(--sa-text-3, #6b7280);
}

.sa-compression-breadcrumb a:hover,
.sa-compression-breadcrumb a:focus-visible {
  color: var(--sa-compression-blue);
}

.sa-compression-hero h1 {
  margin-bottom: 18px;
  font-size: clamp(36px, 3.2vw, 46px);
  font-weight: 650;
  letter-spacing: -.032em;
  line-height: 1.1;
}

.sa-compression-hero__lede {
  max-width: 46ch;
  margin-bottom: 34px;
  color: var(--sa-text-2, #4b5563);
  font-size: 16px;
  line-height: 1.66;
  /* 手机满宽时避免句尾孤词单独掉行（如 performance.）。 */
  text-wrap: pretty;
}

.sa-compression-detail .sa-compression-hero__facts {
  display: grid;
  max-width: 580px;
  margin-bottom: 34px;
  padding: 20px 0;
  border-top: 1px solid #e6eaf0;
  border-bottom: 1px solid #e6eaf0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.sa-compression-hero__facts > div {
  min-width: 0;
  padding-right: 26px;
}

.sa-compression-hero__facts > div + div {
  padding-left: 26px;
  border-left: 1px solid #e6eaf0;
}

.sa-compression-hero__facts dt {
  margin-bottom: 7px;
  color: #0786ce;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.sa-compression-hero__facts dd {
  color: var(--sa-primary, #0f172a);
  font-size: 17px;
  font-weight: 560;
  line-height: 1.3;
}

.sa-compression-hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.sa-compression-hero__actions .btn {
  min-height: 50px;
  padding-inline: 24px;
  border-radius: 6px;
}

.sa-compression-hero__note {
  max-width: 55ch;
  margin: 16px 0 0;
  color: var(--sa-text-3, #6b7280);
  font-size: 12px;
  line-height: 1.5;
}

.sa-compression-hero__media {
  display: grid;
  min-width: 0;
  align-items: center;
  grid-template-columns: minmax(0, 1fr) 106px;
  gap: 24px;
}

/* Products without a curated multi-image gallery show a single full-width image. */
.sa-compression-hero__media--single {
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.sa-compression-hero__primary {
  display: grid;
  min-height: 420px;
  place-items: center;
  margin-bottom: 0;
  overflow: hidden;
}

.sa-compression-hero__primary img {
  width: min(100%, 520px);
  height: 414px;
  object-fit: contain;
  transition: opacity .2s ease;
}

.sa-compression-hero__primary img.is-changing {
  opacity: .25;
}

.sa-compression-hero__thumbs {
  display: grid;
  gap: 14px;
}

.sa-compression-thumb {
  display: grid;
  width: 100%;
  aspect-ratio: 1;
  padding: 0;
  overflow: hidden;
  border: 1px solid #dfe5ec;
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  place-items: center;
  transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}

.sa-compression-thumb:hover,
.sa-compression-thumb:focus-visible,
.sa-compression-thumb.is-active {
  border-color: var(--sa-compression-blue);
  box-shadow: 0 0 0 2px rgba(14, 165, 233, .1);
  transform: translateY(-1px);
}

.sa-compression-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sa-compression-nav .product-tabs {
  gap: clamp(24px, 5vw, 78px);
}

.sa-compression-nav .tab {
  padding-block: 18px 16px;
  font-size: 13px;
}

.sa-compression-nav .tab.is-active::after {
  height: 2px;
  background: var(--sa-compression-blue);
}

.sa-compression-nav .tab:focus-visible {
  outline-color: var(--sa-compression-blue);
  outline-offset: -4px;
}

.sa-compression-quality,
.sa-compression-delivery,
.sa-compression-documents {
  padding-block: clamp(48px, 4.5vw, 68px);
}

.sa-compression-section-head h2 {
  margin-bottom: 16px;
  font-size: clamp(30px, 3vw, 42px);
  font-weight: 620;
  letter-spacing: -.035em;
  line-height: 1.12;
}

.sa-compression-section-head > p:last-child {
  color: var(--sa-text-2, #4b5563);
  font-size: 15px;
  line-height: 1.72;
}

.sa-compression-review {
  padding-block: clamp(28px, 4vw, 54px) clamp(58px, 6vw, 84px);
}

.sa-compression-review__panel {
  display: grid;
  overflow: hidden;
  border: 1px solid #dfe5ec;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 1px 3px rgba(15, 23, 42, .04);
  grid-template-columns: minmax(360px, .86fr) minmax(0, 1.28fr);
}

.sa-compression-review__diagram {
  display: flex;
  padding: clamp(28px, 4vw, 54px);
  flex-direction: column;
  border-right: 1px solid #e2e7ed;
  background: #fbfcfd;
}

.sa-compression-review__diagram h2 {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid #dde4eb;
  color: var(--sa-primary, #0f172a);
  font-size: clamp(18px, 1.5vw, 20px);
  font-weight: 650;
  letter-spacing: -.01em;
}

.sa-compression-review__guide {
  display: flex;
  flex-direction: column;
}

.sa-compression-review__guide[hidden] {
  display: none;
}

.sa-compression-review__guide h3 {
  margin-bottom: 8px;
  color: var(--sa-primary, #0f172a);
  font-size: clamp(16px, 1.3vw, 17px);
  font-weight: 650;
  letter-spacing: -.01em;
  line-height: 1.3;
}

.sa-compression-review__guide > p:not(.sa-compression-review__guide-note) {
  color: var(--sa-text-2, #4b5563);
  font-size: 13px;
  line-height: 1.6;
}

.sa-compression-review__checklist {
  display: grid;
  margin: 20px 0 0;
  border-top: 1px solid #dde4eb;
}

.sa-compression-review__checklist > div {
  display: grid;
  align-items: center;
  padding: 13px 0;
  border-bottom: 1px solid #dde4eb;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
}

.sa-compression-review__checklist dt {
  color: var(--sa-compression-blue);
  font-family: var(--sa-mono, ui-monospace, "SF Mono", Consolas, monospace);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: .01em;
}

.sa-compression-review__checklist dd {
  display: grid;
  margin: 0;
  gap: 2px;
}

.sa-compression-review__checklist strong {
  color: var(--sa-primary, #0f172a);
  font-size: 12.5px;
  font-weight: 650;
}

.sa-compression-review__checklist span {
  color: var(--sa-text-3, #6b7280);
  font-size: 11.5px;
  line-height: 1.5;
}

.sa-compression-review__guide-note {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid #dde4eb;
  color: var(--sa-text-3, #6b7280);
  font-size: 12px;
  line-height: 1.55;
}

.sa-compression-review__dimension-figure {
  display: grid;
  min-height: 250px;
  margin: 30px 0 24px;
  padding: 20px 12px;
  border: 1px solid #e1e6ec;
  border-radius: 8px;
  background: #fff;
  place-items: center;
}

.sa-compression-review__dimension-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
}

.sa-compression-review__dimension-list {
  display: grid;
  margin: 0;
  border-top: 1px solid #dde4eb;
}

.sa-compression-review__dimension-list > div {
  display: grid;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid #dde4eb;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
}

.sa-compression-review__dimension-list dt {
  color: var(--sa-compression-blue);
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
}

.sa-compression-review__dimension-list dt sub {
  font-size: .62em;
}

.sa-compression-review__dimension-list dd {
  display: grid;
  margin: 0;
  gap: 3px;
}

.sa-compression-review__dimension-list strong {
  color: var(--sa-primary, #0f172a);
  font-size: 12px;
  font-weight: 650;
}

.sa-compression-review__dimension-list span {
  color: var(--sa-text-3, #6b7280);
  font-size: 11px;
  line-height: 1.45;
}

.sa-compression-form {
  display: grid;
  align-content: start;
  padding: clamp(28px, 4vw, 54px);
  gap: 15px;
}

.sa-compression-form__modes {
  display: grid;
  margin: -8px 0 10px;
  border-bottom: 1px solid #e1e6ec;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.sa-compression-form__modes button {
  position: relative;
  min-height: 50px;
  padding: 8px 12px 14px;
  border: 0;
  color: var(--sa-text-3, #6b7280);
  background: transparent;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.sa-compression-form__modes button::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: transparent;
  content: "";
}

.sa-compression-form__modes button.is-active {
  color: #0786ce;
}

/* 尺寸参数被设为必填时 drawing 模式被禁用：给出可见的禁用态 */
.sa-compression-form__modes button[disabled] {
  color: #b6bec9;
  cursor: not-allowed;
}

.sa-compression-form__modes button.is-active::after {
  background: var(--sa-compression-blue);
}

.sa-compression-form__drawing h3,
.sa-compression-form__dimensions h3 {
  margin-bottom: 2px;
  font-size: 15px;
  font-weight: 650;
}

.sa-compression-form__drawing > p,
.sa-compression-form__dimensions > p {
  margin-bottom: 14px;
  color: var(--sa-text-3, #6b7280);
  font-size: 12px;
}

.sa-compression-dropzone {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 190px;
  padding: 28px;
  border: 1px dashed #bac5d1;
  border-radius: 7px;
  background: #fff;
  text-align: center;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color .2s ease, background .2s ease;
}

.sa-compression-dropzone__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

.sa-compression-dropzone:hover,
.sa-compression-dropzone:focus-within,
.sa-compression-dropzone.is-dragging {
  border-color: var(--sa-compression-blue);
  background: #f7fcff;
}

.sa-compression-dropzone.has-file {
  border-color: #10b981;
  background: #f0fdf4;
}

.sa-compression-dropzone.has-file .icon {
  color: #10b981;
}

.sa-compression-dropzone.has-file strong {
  color: #047857;
}

.sa-compression-dropzone .icon {
  width: 34px;
  height: 34px;
  margin-bottom: 12px;
}

.sa-compression-dropzone strong {
  margin-bottom: 4px;
  font-size: 14px;
}

.sa-compression-dropzone span {
  color: var(--sa-text-3, #6b7280);
  font-size: 13px;
}

.sa-compression-dropzone small {
  margin-top: 12px;
  color: var(--sa-text-muted, #9ca3af);
  font-size: 11px;
}

.sa-compression-dropzone input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.sa-compression-dropzone__files {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
  gap: 8px;
}

.sa-compression-file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: 5px;
  background: #e8f5e9;
  font-size: 13px;
}

.sa-compression-file-name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: #047857;
  font-weight: 500;
}

.sa-compression-file-remove {
  flex-shrink: 0;
  margin-left: 10px;
  padding: 0;
  width: 24px;
  height: 24px;
  border: none;
  border-radius: 3px;
  background: transparent;
  color: #10b981;
  font-size: 18px;
  font-weight: 300;
  line-height: 1;
  cursor: pointer;
  transition: background .2s ease, color .2s ease;
}

.sa-compression-file-remove:hover {
  background: rgba(220, 38, 38, .1);
  color: #dc2626;
}

.sa-compression-file-add-more {
  margin-top: 8px;
  padding: 8px 16px;
  border: 1px solid #10b981;
  border-radius: 5px;
  background: #f0fdf4;
  color: #047857;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background .2s ease, border-color .2s ease;
}

.sa-compression-file-add-more:hover {
  background: #dbeee7;
  border-color: #059669;
}

.sa-compression-form__dimensions {
  padding: 22px;
  border: 1px solid #e1e6ec;
  border-radius: 7px;
  background: #fbfcfd;
}

.sa-compression-form__row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.sa-compression-form .field > span {
  display: block;
  margin-bottom: 6px;
  color: var(--sa-primary, #0f172a);
  font-size: 12px;
  font-weight: 650;
}

.sa-compression-form .field input,
.sa-compression-form .field select,
.sa-compression-form .field textarea {
  min-height: 48px;
  padding: 11px 13px;
  border: 1px solid #cfd7e2;
  border-radius: 5px;
  font-size: 13px;
  box-shadow: none;
}

.sa-compression-form .field textarea {
  min-height: 118px;
}

.sa-compression-form [aria-invalid="true"] {
  border-color: var(--sa-danger, #dc2626);
  box-shadow: 0 0 0 3px rgba(220, 38, 38, .08);
}

.sa-compression-form .btn-block {
  min-height: 52px;
  justify-content: center;
  border-radius: 5px;
}

.sa-compression-form__privacy,
.sa-compression-form .form-status {
  margin: -8px 0 0;
  color: var(--sa-text-3, #6b7280);
  font-size: 11px;
  text-align: center;
}

.sa-compression-form .form-status.is-error {
  color: var(--sa-danger, #dc2626);
}

.sa-compression-form .form-status.is-success {
  color: var(--sa-success, #059669);
}

.sa-compression-quality {
  border-top: 1px solid #eef1f4;
  background: #fff;
}

.sa-compression-section-head {
  max-width: 720px;
  margin-bottom: 14px;
}

.sa-compression-quality .sa-compression-section-head {
  margin-bottom: 22px;
}

.sa-compression-section-head h2 {
  margin-bottom: 10px;
}

.sa-compression-quality__gallery {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(300px, .75fr);
  grid-template-rows: repeat(2, 190px);
  gap: 14px;
}

.sa-compression-quality__gallery figure {
  position: relative;
  margin-bottom: 0;
  overflow: hidden;
  border-radius: 8px;
  background: #f2f4f7;
}

.sa-compression-quality__gallery figure.is-large {
  grid-row: 1 / -1;
}

.sa-compression-quality__gallery img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sa-compression-quality__gallery figcaption {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  display: grid;
  padding: 36px 18px 16px;
  color: #fff;
  background: linear-gradient(transparent, rgba(15, 23, 42, .82));
  gap: 4px;
}

.sa-compression-quality__gallery figcaption strong {
  font-size: 13px;
  line-height: 1.3;
}

.sa-compression-quality__gallery figcaption span {
  font-size: 11px;
  line-height: 1.45;
  opacity: .85;
}

.sa-compression-quality__steps {
  display: grid;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.sa-compression-quality__steps li {
  display: grid;
  min-width: 0;
  align-items: start;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
}

.sa-compression-quality__steps li > span {
  display: grid;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  color: #fff;
  background: #0e8dd3;
  font-size: 12px;
  font-weight: 700;
  place-items: center;
}

.sa-compression-quality__steps h3,
.sa-compression-delivery__grid h3,
.sa-compression-documents__grid h3 {
  margin-bottom: 4px;
  font-size: 14px;
  font-weight: 650;
  line-height: 1.25;
}

.sa-compression-quality__steps h3 {
  margin-bottom: 7px;
  font-size: 15px;
  line-height: 1.3;
}

.sa-compression-quality__steps p,
.sa-compression-delivery__grid p,
.sa-compression-documents__grid p {
  margin-bottom: 0;
  color: var(--sa-text-3, #6b7280);
  font-size: 11px;
  line-height: 1.55;
}

.sa-compression-quality__steps p {
  font-size: 12px;
  line-height: 1.6;
}

.sa-compression-delivery {
  padding-top: 0;
}

.sa-compression-delivery__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.sa-compression-delivery__grid article {
  min-width: 0;
}

.sa-compression-delivery__grid figure {
  height: 185px;
  margin-bottom: 14px;
  overflow: hidden;
  border-radius: 7px;
  background: #f1f3f5;
}

.sa-compression-delivery__grid img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sa-compression-delivery__grid article.is-large img {
  object-position: center 64%;
}

.sa-compression-delivery__grid article > div {
  display: grid;
  align-items: start;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
}

.sa-compression-delivery__grid article > div > .icon {
  width: 24px;
  height: 24px;
}

.sa-compression-final-cta {
  padding-bottom: clamp(64px, 7vw, 96px);
}

.sa-compression-final-cta__inner {
  display: grid;
  align-items: center;
  padding: clamp(24px, 3vw, 38px);
  border: 1px solid #dfe5ec;
  border-radius: 10px;
  background: #fbfcfd;
  grid-template-columns: 52px minmax(0, 1fr) auto;
  gap: 24px;
}

.sa-compression-final-cta__icon {
  display: grid;
  width: 52px;
  height: 52px;
  border: 1px solid #a8d9f2;
  border-radius: 8px;
  background: #f3fbff;
  place-items: center;
}

.sa-compression-final-cta__icon .icon {
  width: 28px;
  height: 28px;
}

.sa-compression-final-cta h2 {
  margin-bottom: 4px;
  font-size: clamp(22px, 2vw, 30px);
  font-weight: 620;
  letter-spacing: -.025em;
}

.sa-compression-final-cta p {
  max-width: 64ch;
  margin-bottom: 0;
  color: var(--sa-text-2, #4b5563);
  font-size: 13px;
}

.sa-compression-final-cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px;
}

.sa-compression-final-cta__actions .btn {
  min-height: 48px;
  border-radius: 5px;
}

.sa-compression-documents {
  padding-block: 0 54px;
}

.sa-compression-documents__grid {
  display: grid;
  border-top: 1px solid #e4e8ed;
  border-bottom: 1px solid #e4e8ed;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.sa-compression-documents__grid a {
  display: grid;
  min-width: 0;
  padding: 22px 20px;
  color: inherit;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
  transition: background .2s ease;
}

.sa-compression-documents__grid a + a {
  border-left: 1px solid #e4e8ed;
}

.sa-compression-documents__grid a:hover,
.sa-compression-documents__grid a:focus-visible {
  background: #f8fafc;
}

.sa-compression-documents__grid .icon {
  width: 27px;
  height: 27px;
}

@media (max-width: 1100px) {
  .sa-compression-hero__inner {
    grid-template-columns: minmax(0, .9fr) minmax(430px, 1.05fr);
    gap: 40px;
  }

  .sa-compression-hero__primary img {
    height: 410px;
  }

  .sa-compression-review__panel {
    grid-template-columns: minmax(330px, .78fr) minmax(0, 1.22fr);
  }

  .sa-compression-final-cta__inner {
    grid-template-columns: 52px minmax(0, 1fr);
  }

  .sa-compression-final-cta__actions {
    grid-column: 2;
    justify-content: flex-start;
  }
}

@media (max-width: 860px) {
  .sa-compression-hero {
    padding-top: 18px;
    background: #fff;
  }

  .sa-compression-hero__inner {
    min-height: 0;
    grid-template-columns: 1fr;
    gap: 14px;
  }

  /* 手机首屏顺序：面包屑+标题 → 图片与缩略图 → 导语/规格/操作。
     把文案块展开成网格项后用 order 重排，桌面双栏不受影响。 */
  .sa-compression-hero__copy {
    display: contents;
  }

  .sa-compression-hero__media {
    order: 2;
    grid-template-columns: minmax(0, 1fr) 82px;
    gap: 16px;
  }

  .sa-compression-hero__lede,
  .sa-compression-hero__facts {
    order: 3;
  }

  .sa-compression-hero__actions,
  .sa-compression-hero__note {
    order: 4;
  }

  .sa-compression-breadcrumb {
    margin-bottom: 26px;
  }

  .sa-compression-hero h1 {
    font-size: clamp(38px, 10vw, 54px);
  }

  .sa-compression-hero__primary {
    min-height: 360px;
  }

  .sa-compression-hero__primary img {
    height: 360px;
  }

  .sa-compression-review__panel {
    grid-template-columns: 1fr;
  }

  .sa-compression-review__diagram {
    border-right: 0;
    border-bottom: 1px solid #e2e7ed;
  }

  /* 手机上表单是主角：说明栏收成一句引导，隐藏清单/示意图等重内容
     （文字密度与层级问题），两套 guide 高度对齐后，
     切换「图纸 / 尺寸」标签时表单不再上下跳动。 */
  .sa-compression-review__guide .sa-compression-review__checklist,
  .sa-compression-review__guide .sa-compression-review__dimension-list,
  .sa-compression-review__guide .sa-compression-review__dimension-figure,
  .sa-compression-review__guide-note {
    display: none;
  }

  .sa-compression-review__guide {
    min-height: 96px;
  }

  .sa-compression-review__diagram h2 {
    margin-bottom: 18px;
    padding-bottom: 16px;
  }

  .sa-compression-review__checklist {
    margin-top: 18px;
  }

  .sa-compression-review__guide-note {
    padding-top: 16px;
  }

  .sa-compression-quality__steps,
  .sa-compression-delivery__grid,
  .sa-compression-documents__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sa-compression-quality__steps {
    gap: 22px 12px;
  }

  .sa-compression-quality__steps li:nth-child(2)::after {
    display: none;
  }

  .sa-compression-documents__grid a:nth-child(3) {
    border-left: 0;
  }

  .sa-compression-documents__grid a:nth-child(n + 3) {
    border-top: 1px solid #e4e8ed;
  }
}

@media (max-width: 640px) {
  .sa-compression-detail .container-wide {
    width: min(100% - 32px, var(--sa-container-wide));
  }

  .sa-compression-hero {
    padding-bottom: 34px;
  }

  .sa-compression-hero__lede {
    font-size: 15px;
  }

  /* 640px 以下不再三列硬挤（每列仅约 109px）：每条规格一行，
     标签在左、数值在右，与首页 ABOUT facts 的移动端形态一致。 */
  .sa-compression-detail .sa-compression-hero__facts {
    grid-template-columns: 1fr;
    padding: 13px 0;
  }

  .sa-compression-hero__facts > div {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 18px;
    padding: 13px 0;
  }

  .sa-compression-hero__facts > div + div {
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid #e6eaf0;
  }

  .sa-compression-hero__facts dt {
    margin-bottom: 0;
    font-size: 11px;
  }

  .sa-compression-hero__facts dd {
    font-size: 15px;
    text-align: right;
  }

  /* 两个操作按钮手机上并排：各占一半、内容居中。 */
  .sa-compression-hero__actions {
    align-items: stretch;
    flex-wrap: nowrap;
    gap: 8px;
  }

  .sa-compression-hero__actions .btn {
    justify-content: center;
    flex: 1 1 0;
    min-width: 0;
    padding-inline: 10px;
    font-size: 12.5px;
    white-space: nowrap;
  }

  .sa-compression-hero__media {
    grid-template-columns: 1fr;
  }

  .sa-compression-hero__primary {
    min-height: 330px;
  }

  .sa-compression-hero__primary img {
    height: 330px;
  }

  .sa-compression-hero__thumbs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .sa-compression-thumb {
    aspect-ratio: 1.3;
  }

  .sa-compression-quality,
  .sa-compression-delivery {
    padding-block: 58px;
  }

  .sa-compression-review {
    padding-block: 24px 64px;
  }

  .sa-compression-review > .container-wide {
    width: 100%;
  }

  .sa-compression-review__panel {
    border-right: 0;
    border-left: 0;
    border-radius: 0;
  }

  .sa-compression-review__diagram,
  .sa-compression-form {
    padding: 28px 20px;
  }

  .sa-compression-form__modes {
    overflow-x: auto;
  }

  .sa-compression-form__modes button {
    min-width: 170px;
  }

  .sa-compression-form__row,
  .sa-compression-quality__steps,
  .sa-compression-documents__grid {
    grid-template-columns: 1fr;
  }

  /* 质量图廊：大图满宽，两张带说明的小图并排——
     恢复桌面「一大两小」的层级，避免三张满宽大图单调堆叠。 */
  .sa-compression-quality__gallery {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-rows: none;
  }

  .sa-compression-quality__gallery figure {
    height: 180px;
    grid-row: auto;
  }

  .sa-compression-quality__gallery figure.is-large {
    grid-column: 1 / -1;
    height: 240px;
  }

  .sa-compression-quality__steps li::after {
    display: none;
  }

  .sa-compression-delivery {
    padding-top: 0;
  }

  /* 发货卡片：手机改为横向滑动轮播（scroll-snap），每张约 78% 屏宽、
     露出下一张边缘作为可滑动提示。 */
  .sa-compression-delivery__grid {
    display: flex;
    gap: 14px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    overscroll-behavior-x: contain;
    padding-bottom: 8px;
    scrollbar-width: none;
    scroll-padding-inline-start: 16px;
  }

  .sa-compression-delivery__grid::-webkit-scrollbar {
    display: none;
  }

  .sa-compression-delivery__grid article {
    flex: 0 0 78%;
    scroll-snap-align: start;
  }

  .sa-compression-delivery__grid figure {
    height: 210px;
  }

  .sa-compression-final-cta__inner {
    grid-template-columns: 1fr;
  }

  .sa-compression-final-cta__actions {
    grid-column: 1;
    align-items: stretch;
    flex-direction: column;
  }

  .sa-compression-final-cta__actions .btn {
    justify-content: center;
    width: 100%;
  }

  .sa-compression-documents__grid a,
  .sa-compression-documents__grid a + a,
  .sa-compression-documents__grid a:nth-child(3),
  .sa-compression-documents__grid a:nth-child(n + 3) {
    border-top: 1px solid #e4e8ed;
    border-left: 0;
  }

  .sa-compression-documents__grid a:first-child {
    border-top: 0;
  }

}

@media (max-width: 400px) {
  /* 窄屏回退上下堆叠：并排时每个按钮仅约 140px，
     图标 + 间距 + 不折行的文案放不下，会挤向相邻按钮。 */
  .sa-compression-hero__actions {
    flex-direction: column;
  }

  .sa-compression-hero__actions .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sa-compression-thumb,
  .sa-compression-hero__primary img {
    transition: none;
  }
}