.saiwei-page {
  --royal: #2563eb;
  --royal-2: #d7ff66;
  --royal-soft: #f2ffde;
  --deep: #0b0d10;
  --deep-2: #272727;
  --cream: #ffffff;
  --cream-2: #f4f6f8;
  --cream-3: #e5e7eb;
  --silver: #dbdbdb;
  --silver-2: #e5e7eb;
  --silver-3: #f4f6f8;
  --silver-4: #eef1f4;
  --ink: #0d0d0d;
  --muted: #505050;
  --green: #2b7b65;
  --amber: #a46a18;
  --line: rgba(17, 24, 39, 0.1);
  --soft-shadow: 0 24px 65px rgba(17, 24, 39, 0.1);
  --soft-shadow-sm: 0 10px 32px rgba(17, 24, 39, 0.07);
  --radius-xl: 32px;
  --radius-lg: 26px;
  --radius-md: 18px;
  --content: min(calc(100% - 36px), 1350px);
  width: 100%;
  overflow: hidden;
  background: var(--cream);
  color: var(--ink);
  font-family:
    "Outfit",
    Inter,
    ui-sans-serif,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.saiwei-page img {
  display: block;
  max-width: 100%;
}

.saiwei-page button,
.saiwei-page summary {
  font: inherit;
}

.saiwei-page .skip-link {
  position: fixed;
  left: 12px;
  top: 12px;
  z-index: 9999;
  padding: 10px 14px;
  background: #fff;
  border-radius: 12px;
  transform: translateY(-180%);
  box-shadow: var(--soft-shadow-sm);
  font-weight: 800;
}

.saiwei-page .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #0b0d10;
}

.saiwei-page .eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: #c7ff2e;
}

.saiwei-page .section.alt {
  background: var(--cream-2);
}

.saiwei-page .section.silver {
  background: var(--silver-3);
}

.saiwei-page .section-head {
  width: var(--content);
  margin: 0 auto 38px;
  display: flex;
  justify-content: space-between;
  gap: 36px;
  align-items: end;
}

.saiwei-page .section-title {
  margin: 12px 0 0;
  font-size: clamp(2.2rem, 4.3vw, 3.3rem);
  line-height: 0.98;
  letter-spacing: -0.05em;
  color: var(--deep);
  font-weight: 950;
}

.saiwei-page .section-lead {
  max-width: 690px;
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
}

.saiwei-page .btn {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 13px 20px;
  border-radius: 14px;
  border: 1px solid transparent;
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  transition: 0.2s ease;
}

.saiwei-page .btn-primary {
  background: #c7ff2e;
  color: #0b0d10;
  box-shadow: 0 15px 34px rgba(11, 13, 16, 0.2);
}

.saiwei-page .btn-secondary {
  background: rgba(255, 255, 255, 0.78);
  color: var(--deep);
  border-color: rgba(17, 24, 39, 0.13);
}

.saiwei-page .btn-silver {
  background: var(--silver-4);
  color: var(--deep);
  border-color: var(--silver);
}

.saiwei-page .text-link {
  color: var(--royal);
  font-weight: 850;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.saiwei-page .pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 11px;
  border-radius: 999px;
  font-size: 0.67rem;
  font-weight: 900;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.saiwei-page .pill.verified {
  background: #ebebeb;
  color: var(--green);
}

.saiwei-page .pill.pending {
  background: #fff3dd;
  color: var(--amber);
}

.saiwei-page .pill.neutral {
  background: var(--silver-4);
  color: #636363;
}

.saiwei-page .site-header {
  position: relative;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(17, 24, 39, 0.08);
  backdrop-filter: blur(16px);
}

.saiwei-page .header-inner {
  width: var(--content);
  margin: auto;
  min-height: 76px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
}

.saiwei-page .brand {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--deep);
  font-weight: 950;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.saiwei-page .brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, var(--royal), var(--deep));
  color: #0b0d10;
  box-shadow: 0 8px 20px rgba(11, 13, 16, 0.2);
}

.saiwei-page .desktop-nav {
  display: flex;
  justify-content: center;
  gap: 24px;
}

.saiwei-page .desktop-nav a {
  font-size: 0.75rem;
  font-weight: 800;
  color: #555555;
}

.saiwei-page .menu-btn {
  display: none;
  width: 46px;
  height: 46px;
  border-radius: 13px;
  border: 1px solid var(--silver-2);
  background: #fff;
  color: var(--deep);
}

.saiwei-page .mobile-menu {
  position: absolute;
  top: 76px;
  left: 18px;
  right: 18px;
  background: #fff;
  border: 1px solid var(--silver-2);
  border-radius: 20px;
  padding: 10px;
  box-shadow: var(--soft-shadow);
}

.saiwei-page .mobile-menu a {
  display: block;
  padding: 12px 14px;
  border-radius: 12px;
  font-weight: 800;
}

.saiwei-page .mobile-menu a:hover {
  background: var(--silver-3);
}

.saiwei-page .breadcrumb {
  width: var(--content);
  margin: auto;
  min-height: 48px;
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.73rem;
  color: var(--muted);
}

.saiwei-page .breadcrumb a:hover {
  color: var(--royal);
}

.saiwei-page .hero {
  padding: 44px 0 70px;
  background: linear-gradient(180deg, var(--cream-2) 0, var(--cream) 74%);
}

.saiwei-page .hero-shell {
  width: var(--content);
  margin: auto;
  display: grid;
  grid-template-columns: minmax(0, 0.96fr) minmax(460px, 1.04fr);
  gap: 34px;
  align-items: stretch;
}

.saiwei-page .hero-copy {
  padding: 52px 14px 44px 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.saiwei-page h1 {
  margin: 18px 0 0;
  font-size: clamp(2.4rem, 6.4vw, 5rem);
  line-height: 0.92;
  letter-spacing: -0.064em;
  color: var(--deep);
  font-weight: 950;
}

.saiwei-page .hero-copy p {
  max-width: 760px;
  margin: 25px 0 0;
  color: #636363;
  font-size: 1.06rem;
}

.saiwei-page .hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 30px;
}

.saiwei-page .neutral-note {
  margin-top: 24px;
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.64);
  border: 1px solid rgba(17, 24, 39, 0.08);
  color: #636363;
  font-size: 0.88rem;
  max-width: 720px;
}

.saiwei-page .neutral-note strong {
  color: var(--deep);
}

.saiwei-page .hero-visual {
  position: relative;
  min-height: 610px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: linear-gradient(145deg, #ebebeb, #dbdbdb);
  box-shadow: var(--soft-shadow);
}

.saiwei-page .hero-visual img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  min-height: 610px;
  object-fit: cover;
}

.saiwei-page .hero-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(
      circle at 72% 20%,
      rgba(255, 255, 255, 0.75),
      transparent 30%
    ),
    linear-gradient(135deg, rgba(11, 13, 16, 0.13), rgba(17, 24, 39, 0.06));
}

.saiwei-page .hero-visual::after {
  content: "REAL CARBON + PP COMPARISON VISUAL";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #505050;
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.13em;
}

.saiwei-page .hero-route-strip {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 18px;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 10px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  box-shadow: 0 12px 34px rgba(17, 24, 39, 0.12);
}

.saiwei-page .route-mini {
  padding: 14px 15px;
  border-radius: 16px;
}

.saiwei-page .route-mini.carbon {
  background: var(--royal-soft);
}

.saiwei-page .route-mini.plastic {
  background: var(--silver-3);
}

.saiwei-page .route-mini strong {
  display: block;
  color: var(--deep);
}

.saiwei-page .route-mini span {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.72rem;
}

.saiwei-page .quick-card {
  width: var(--content);
  margin: auto;
  padding: 28px 30px;
  border-radius: 24px;
  background: #fff;
  border: 1px solid var(--silver-2);
  box-shadow: var(--soft-shadow-sm);
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 28px;
  align-items: start;
}

.saiwei-page .quick-card strong {
  color: #0b0d10;
  font-size: 0.72rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.saiwei-page .quick-card p {
  margin: 0;
  color: #555555;
  font-size: 1.02rem;
}

.saiwei-page .comparison-shell {
  width: var(--content);
  margin: auto;
  border-radius: var(--radius-xl);
  background: #fff;
  border: 1px solid var(--silver-2);
  box-shadow: var(--soft-shadow-sm);
  overflow: hidden;
}

.saiwei-page .comparison-top {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-bottom: 1px solid var(--silver-2);
}

.saiwei-page .material-overview {
  padding: 30px 32px;
}

.saiwei-page .material-overview.carbon {
  background: linear-gradient(135deg, #f2ffde, #ebebeb);
}

.saiwei-page .material-overview.plastic {
  background: linear-gradient(135deg, #fafbfc, #eef1f4);
}

.saiwei-page .material-overview h3 {
  margin: 10px 0 0;
  color: var(--deep);
  font-size: 2rem;
  line-height: 1.05;
  letter-spacing: -0.035em;
}

.saiwei-page .material-overview p {
  margin: 10px 0 0;
  color: var(--muted);
}

.saiwei-page .verified-strip {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.saiwei-page .fact-chip {
  padding: 8px 11px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(17, 24, 39, 0.08);
  font-size: 0.72rem;
  font-weight: 800;
  color: #636363;
}

.saiwei-page .table-wrap {
  overflow-x: auto;
  padding: 12px 20px 22px;
}

.saiwei-page table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  min-width: 820px;
}

.saiwei-page th,
.saiwei-page td {
  padding: 14px 14px;
  text-align: left;
  border-bottom: 1px solid var(--silver-2);
  vertical-align: middle;
}

.saiwei-page th {
  font-size: 0.69rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: #636363;
  background: var(--silver-3);
}

.saiwei-page thead th:first-child {
  border-radius: 14px 0 0 14px;
}

.saiwei-page thead th:last-child {
  border-radius: 0 14px 14px 0;
}

.saiwei-page td {
  font-size: 0.9rem;
  color: #424242;
}

.saiwei-page td strong {
  color: var(--deep);
}

.saiwei-page tr:last-child td {
  border-bottom: 0;
}

.saiwei-page .comparison-foot {
  margin: 0 24px 24px;
  padding: 16px 18px;
  border-radius: 16px;
  background: var(--cream-2);
  color: #636363;
  font-size: 0.9rem;
}

.saiwei-page .evidence-lanes {
  width: var(--content);
  margin: auto;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.saiwei-page .evidence-card {
  padding: 27px;
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--silver-2);
  box-shadow: var(--soft-shadow-sm);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  align-items: start;
}

.saiwei-page .evidence-icon {
  width: 52px;
  height: 52px;
  border-radius: 17px;
  display: grid;
  place-items: center;
  background: var(--royal-soft);
  color: var(--royal);
  font-weight: 950;
}

.saiwei-page .evidence-card:nth-child(even) .evidence-icon {
  background: var(--silver-3);
  color: #636363;
}

.saiwei-page .evidence-card h3 {
  margin: 2px 0 0;
  color: var(--deep);
  font-size: 1.35rem;
}

.saiwei-page .evidence-card p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.91rem;
}

.saiwei-page .evidence-status {
  margin-top: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--silver-2);
  font-size: 0.78rem;
  color: #505050;
}

.saiwei-page .dual-evidence {
  width: var(--content);
  margin: auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.saiwei-page .soft-panel {
  padding: 31px;
  border-radius: var(--radius-xl);
  background: #fff;
  border: 1px solid var(--silver-2);
  box-shadow: var(--soft-shadow-sm);
}

.saiwei-page .soft-panel.tint {
  background: linear-gradient(150deg, #f8f8f8, #fff);
}

.saiwei-page .soft-panel h3 {
  margin: 12px 0 0;
  font-size: 2rem;
  line-height: 1.05;
  color: var(--deep);
  letter-spacing: -0.035em;
}

.saiwei-page .soft-panel p {
  color: var(--muted);
}

.saiwei-page .soft-panel ul {
  padding-left: 20px;
  color: #424242;
}

.saiwei-page .soft-panel li + li {
  margin-top: 6px;
}

.saiwei-page .pending-box {
  margin-top: 19px;
  padding: 18px 19px;
  border-radius: 18px;
  background: var(--silver-3);
  border: 1px dashed var(--silver);
  color: #636363;
}

.saiwei-page .pending-box strong {
  display: block;
  color: var(--deep);
}

.saiwei-page .impact-shell {
  width: var(--content);
  margin: auto;
  padding: 38px;
  border-radius: var(--radius-xl);
  background: linear-gradient(
    135deg,
    var(--deep),
    var(--deep-2) 62%,
    var(--royal)
  );
  color: #fff;
  box-shadow: var(--soft-shadow);
  position: relative;
  overflow: hidden;
}

.saiwei-page .impact-shell::after {
  content: "EVIDENCE FIRST";
  position: absolute;
  right: -30px;
  bottom: -34px;
  font-size: clamp(4rem, 10vw, 9rem);
  font-weight: 950;
  line-height: 1;
  color: rgba(255, 255, 255, 0.05);
  letter-spacing: -0.06em;
  white-space: nowrap;
}

.saiwei-page .impact-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 34px;
  align-items: start;
}

.saiwei-page .impact-shell h2 {
  margin: 11px 0 0;
  font-size: clamp(2.5rem, 4.8vw, 3.3rem);
  line-height: 0.98;
  letter-spacing: -0.05em;
}

.saiwei-page .impact-shell p {
  color: #dbdbdb;
}

.saiwei-page .research-card {
  padding: 28px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.94);
  color: var(--ink);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
}

.saiwei-page .research-card h3 {
  margin: 8px 0 0;
  color: var(--deep);
  font-size: 1.6rem;
}

.saiwei-page .research-card p,
.saiwei-page .research-card li {
  color: #636363;
}

.saiwei-page .research-card ul {
  padding-left: 20px;
}

.saiwei-page .research-card li + li {
  margin-top: 5px;
}

.saiwei-page .impact-result {
  margin-top: 18px;
  padding: 15px 17px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.17);
  font-size: 0.88rem;
  color: #ebebeb;
}

.saiwei-page .fit-shell {
  width: var(--content);
  margin: auto;
  display: grid;
  grid-template-columns: minmax(0, 0.84fr) minmax(0, 1.16fr);
  gap: 26px;
  align-items: stretch;
}

.saiwei-page .fit-copy {
  padding: 30px;
  border-radius: var(--radius-xl);
  background: #fff;
  border: 1px solid var(--silver-2);
  box-shadow: var(--soft-shadow-sm);
}

.saiwei-page .fit-copy h2 {
  margin: 12px 0 0;
  font-size: clamp(2.4rem, 4.4vw, 3.3rem);
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--deep);
}

.saiwei-page .fit-copy p {
  color: var(--muted);
}

.saiwei-page .fit-copy ul {
  padding-left: 20px;
  color: #555555;
}

.saiwei-page .fit-table {
  border-radius: var(--radius-xl);
  background: #fff;
  border: 1px solid var(--silver-2);
  box-shadow: var(--soft-shadow-sm);
  padding: 20px;
  overflow: hidden;
}

.saiwei-page .fit-table .table-wrap {
  padding: 0;
}

.saiwei-page .print-shell {
  width: var(--content);
  margin: auto;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  gap: 28px;
  align-items: center;
}

.saiwei-page .print-copy {
  padding-right: 2vw;
}

.saiwei-page .print-copy h2 {
  margin: 12px 0 0;
  font-size: clamp(2.4rem, 4.6vw, 3.3rem);
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--deep);
}

.saiwei-page .print-copy p {
  color: var(--muted);
}

.saiwei-page .capability-cloud {
  display: flex;
  gap: 9px;
  flex-wrap: wrap;
  margin-top: 19px;
}

.saiwei-page .capability-cloud span {
  padding: 9px 13px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--silver-2);
  box-shadow: 0 6px 18px rgba(17, 24, 39, 0.04);
  font-size: 0.78rem;
  font-weight: 800;
  color: #636363;
}

.saiwei-page .print-visual {
  border-radius: var(--radius-xl);
  background: linear-gradient(145deg, #ebebeb, #dbdbdb);
  box-shadow: var(--soft-shadow-sm);
  position: relative;
  overflow: hidden;
}

.saiwei-page .print-visual img {
  position: relative;
  z-index: 1;
  width: 100%;
  object-fit: cover;
}

.saiwei-page .print-visual.is-missing img {
  display: none;
}

.saiwei-page .print-visual::after {
  content: "SAME ARTWORK / REAL PRINT TEST VISUAL";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #505050;
  font-size: 0.66rem;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.saiwei-page .choice-grid {
  width: var(--content);
  margin: auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.saiwei-page .choice-card {
  padding: 34px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--silver-2);
  box-shadow: var(--soft-shadow-sm);
}

.saiwei-page .choice-card.carbon {
  background: linear-gradient(145deg, #f8f8f8, #fff);
}

.saiwei-page .choice-card.plastic {
  background: linear-gradient(145deg, #f7f8fa, #eef1f4);
}

.saiwei-page .choice-card h2 {
  margin: 12px 0 0;
  font-size: clamp(2rem, 3.4vw, 3.3rem);
  line-height: 1;
  letter-spacing: -0.045em;
  color: var(--deep);
}

.saiwei-page .choice-card p {
  color: var(--muted);
}

.saiwei-page .choice-card ul {
  padding-left: 20px;
  color: #555555;
}

.saiwei-page .choice-card li + li {
  margin-top: 6px;
}

.saiwei-page .choice-card .btn {
  margin-top: 12px;
}

.saiwei-page .method-shell {
  width: var(--content);
  margin: auto;
  display: grid;
  grid-template-columns: minmax(280px, 0.38fr) minmax(0, 0.62fr);
  gap: 42px;
  align-items: start;
}

.saiwei-page .method-intro {
  position: sticky;
  top: 24px;
}

.saiwei-page .method-intro h2 {
  margin: 12px 0 0;
  font-size: clamp(2.5rem, 4.6vw, 3.3rem);
  line-height: 0.98;
  letter-spacing: -0.05em;
  color: var(--deep);
}

.saiwei-page .method-intro p {
  color: var(--muted);
}

.saiwei-page .method-list {
  display: grid;
  gap: 12px;
}

.saiwei-page .method-step {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 16px;
  padding: 18px 19px;
  border-radius: 19px;
  background: #fff;
  border: 1px solid var(--silver-2);
  box-shadow: 0 7px 24px rgba(17, 24, 39, 0.045);
}

.saiwei-page .method-step b {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: #c7ff2e;
  color: #0b0d10;
  font-size: 0.75rem;
}

.saiwei-page .method-step strong {
  display: block;
  color: var(--deep);
}

.saiwei-page .method-step span {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.89rem;
}

.saiwei-page .read-grid {
  width: var(--content);
  margin: auto;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.saiwei-page .read-card {
  padding: 27px;
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--silver-2);
  box-shadow: var(--soft-shadow-sm);
}

.saiwei-page .read-card h3 {
  margin: 9px 0 0;
  color: var(--deep);
  font-size: 1.45rem;
}

.saiwei-page .read-card p,
.saiwei-page .read-card li {
  color: var(--muted);
}

.saiwei-page .read-card ul {
  padding-left: 19px;
}

.saiwei-page .faq-shell {
  width: var(--content);
  margin: auto;
  display: grid;
  grid-template-columns: minmax(250px, 0.37fr) minmax(0, 0.63fr);
  gap: 46px;
  align-items: start;
}

.saiwei-page .faq-intro {
  position: sticky;
  top: 24px;
}

.saiwei-page .faq-intro p {
  color: var(--muted);
}

.saiwei-page .faq-list {
  display: grid;
  gap: 12px;
}

.saiwei-page details {
  border: 1px solid var(--silver-2);
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 7px 20px rgba(17, 24, 39, 0.05);
  overflow: hidden;
}

.saiwei-page summary {
  list-style: none;
  cursor: pointer;
  padding: 19px 22px;
  font-weight: 850;
  color: var(--deep);
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

.saiwei-page summary::-webkit-details-marker {
  display: none;
}

.saiwei-page summary::after {
  content: "+";
  width: 28px;
  height: 28px;
  border-radius: 10px;
  background: var(--silver-3);
  display: grid;
  place-items: center;
  color: #0b0d10;
  font-size: 1rem;
  flex: 0 0 auto;
}

.saiwei-page details[open] summary::after {
  content: "–";
}

.saiwei-page details > div {
  padding: 0 22px 20px;
  color: var(--muted);
}

.saiwei-page details > div p {
  margin: 0;
}

.saiwei-page .final {
  padding: 42px 0 90px;
}

.saiwei-page .final-card {
  width: var(--content);
  margin: auto;
  padding: 48px;
  border-radius: 34px;
  background: linear-gradient(
    135deg,
    var(--royal) 0,
    #b8f625 50%,
    var(--deep) 100%
  );
  color: #fff;
  box-shadow: 0 28px 70px rgba(11, 13, 16, 0.22);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 34px;
  align-items: center;
}

.saiwei-page .final-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.saiwei-page .footer-inner {
  width: var(--content);
  margin: auto;
  padding: 34px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.saiwei-page .footer-brand {
  color: #fff;
  font-weight: 950;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.saiwei-page .footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.saiwei-page .footer-links a {
  font-size: 0.75rem;
}

@media (max-width: 1024px) {
  .saiwei-page .desktop-nav {
    display: none;
  }
}

@media (max-width: 1024px) {
  .saiwei-page .header-inner {
    grid-template-columns: 1fr auto auto;
  }
}

@media (max-width: 1024px) {
  .saiwei-page .menu-btn {
    display: grid;
    place-items: center;
  }
}

@media (max-width: 1024px) {
  .saiwei-page .hero-shell,
  .saiwei-page .impact-grid,
  .saiwei-page .fit-shell,
  .saiwei-page .print-shell,
  .saiwei-page .method-shell,
  .saiwei-page .faq-shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 1024px) {
  .saiwei-page .hero-copy {
    padding: 36px 0 8px;
  }
}

@media (max-width: 1024px) {
  .saiwei-page .hero-visual,
  .saiwei-page .hero-visual img {
    min-height: 520px;
  }
}

@media (max-width: 1024px) {
  .saiwei-page .method-intro,
  .saiwei-page .faq-intro {
    position: static;
  }
}

@media (max-width: 1024px) {
  .saiwei-page .final-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 1024px) {
  .saiwei-page .final-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 767px) {
  .saiwei-page {
    --content: min(calc(100% - 24px), 1350px);
  }
}

@media (max-width: 767px) {
  .saiwei-page .header-inner {
    min-height: 68px;
  }
}

@media (max-width: 767px) {
  .saiwei-page .header-cta {
    display: none;
  }
}

@media (max-width: 767px) {
  .saiwei-page .mobile-menu {
    top: 68px;
  }
}

@media (max-width: 767px) {
  .saiwei-page .hero {
    padding-top: 24px;
  }
}

@media (max-width: 767px) {
  .saiwei-page h1 {
    font-size: clamp(2.4rem, 12vw, 4.8rem);
  }
}

@media (max-width: 767px) {
  .saiwei-page .hero-copy p {
    font-size: 1rem;
  }
}

@media (max-width: 767px) {
  .saiwei-page .hero-actions {
    display: grid;
  }
}

@media (max-width: 767px) {
  .saiwei-page .hero-actions .btn {
    width: 100%;
  }
}

@media (max-width: 767px) {
  .saiwei-page .hero-visual,
  .saiwei-page .hero-visual img {
    min-height: 410px;
  }
}

@media (max-width: 767px) {
  .saiwei-page .hero-route-strip {
    grid-template-columns: 1fr;
    left: 14px;
    right: 14px;
    bottom: 14px;
  }
}

@media (max-width: 767px) {
  .saiwei-page .quick-card {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 22px;
  }
}

@media (max-width: 767px) {
  .saiwei-page .section-head {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 767px) {
  .saiwei-page .comparison-top,
  .saiwei-page .evidence-lanes,
  .saiwei-page .dual-evidence,
  .saiwei-page .choice-grid,
  .saiwei-page .read-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 767px) {
  .saiwei-page .material-overview {
    padding: 24px;
  }
}

@media (max-width: 767px) {
  .saiwei-page .evidence-card {
    grid-template-columns: 44px 1fr;
    padding: 22px;
  }
}

@media (max-width: 767px) {
  .saiwei-page .impact-shell {
    padding: 28px 22px;
  }
}

@media (max-width: 767px) {
  .saiwei-page .soft-panel,
  .saiwei-page .choice-card,
  .saiwei-page .fit-copy {
    padding: 24px;
  }
}

@media (max-width: 767px) {
  .saiwei-page .method-step {
    grid-template-columns: 42px 1fr;
    padding: 16px;
  }
}

@media (max-width: 767px) {
  .saiwei-page .final-card {
    padding: 34px 24px;
  }
}

@media (max-width: 767px) {
  .saiwei-page .final-actions {
    display: grid;
  }
}

@media (max-width: 767px) {
  .saiwei-page .final-actions .btn {
    width: 100%;
  }
}

@media (max-width: 767px) {
  .saiwei-page .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  .saiwei-page .btn-primary:hover,
  .saiwei-page .btn-secondary:hover {
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .saiwei-page * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

.saiwei-page section {
  padding: 75px 0 !important;
}

@media (max-width: 780px) {
  .saiwei-page section {
    padding: 55px 0 !important;
  }
}

/* --- External study data module (2026-09-09) --- */

.saiwei-page .pill.study {
  background: #e9f0fe;
  color: #1e50c8;
}

.saiwei-page .research-card .cite-line {
  margin: 12px 0 0;
  padding: 10px 14px;
  border-left: 3px solid var(--royal);
  border-radius: 0 12px 12px 0;
  background: var(--silver-3);
  color: var(--muted);
  font-size: 0.78rem;
}

.saiwei-page .research-card table.study-table {
  min-width: 0;
  margin-top: 14px;
}

.saiwei-page .research-card .table-wrap {
  padding: 0;
}

.saiwei-page .impact-chart {
  margin: 34px 0 0;
}

.saiwei-page .impact-chart img {
  width: 100%;
  height: auto;
  border-radius: 16px;
}

.saiwei-page .impact-chart figcaption {
  margin-top: 10px;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.78rem;
}