/* ============================================================
   Valyx Peptides — Stacks + Just-This BOGO buy box (v2)
   Scoped under .vx-stack
   ============================================================ */

.vx-stack {
  --vx-stack-primary: var(--cp-primary, #172841);
  --vx-stack-primary-soft: rgba(23, 40, 65, 0.08);
  --vx-stack-primary-tint: rgba(23, 40, 65, 0.05);
  --vx-stack-border: var(--cp-border, #e8e8e8);
  --vx-stack-radius: 12px;
  --vx-stack-radius-sm: 8px;
  --vx-stack-radius-pill: 999px;
  --vx-stack-gold: #b08a3e;
  --vx-stack-shadow: 0 1px 2px rgba(15, 28, 48, 0.04);
  display: block;
  width: 100%;
  margin: 0.5rem 0 1rem;
}

/* ---- Header chips ---- */
.vx-stack__top {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 0 0 0.85rem;
}

.vx-stack__chip {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.65rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--cp-text, #1a1a1a);
  background: #fff;
  border: 1px solid var(--vx-stack-border);
  border-radius: var(--vx-stack-radius-sm);
}

.vx-stack__chip-flag { flex-shrink: 0; font-size: 1.05rem; line-height: 1; }

.vx-stack__coa {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.65rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--vx-stack-primary);
  background: #fff;
  border: 1px solid var(--vx-stack-border);
  border-radius: var(--vx-stack-radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.vx-stack__coa:hover {
  background: var(--vx-stack-primary-tint);
  border-color: rgba(23, 40, 65, 0.25);
}

.vx-stack__coa-icon { font-size: 1rem; }

/* ---- Tabs (2-column layout) ---- */
.vx-stack__tabs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  padding: 4px;
  margin: 0 0 1rem;
  background: var(--cp-bg-subtle, #f3f4f8);
  border-radius: var(--vx-stack-radius);
}

.vx-stack__tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.1rem;
  padding: 0.7rem 0.5rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--cp-text-muted, rgba(26, 26, 26, 0.72));
  background: transparent;
  border: none;
  border-radius: calc(var(--vx-stack-radius) - 4px);
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.vx-stack__tab-sub {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cp-text-soft, rgba(26, 26, 26, 0.55));
}

.vx-stack__tab.is-active {
  background: #fff;
  color: var(--vx-stack-primary);
  box-shadow: var(--vx-stack-shadow);
}

.vx-stack__tab.is-active .vx-stack__tab-sub { color: var(--vx-stack-primary); }

/* ---- Panels ---- */
.vx-stack__panel { display: none; }
.vx-stack__panel.is-active { display: block; }

.vx-stack__panel-label {
  margin: 0 0 0.7rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cp-text-soft, rgba(26, 26, 26, 0.55));
}

/* ---- Curated stack cards (Stacks tab) ---- */
.vx-stack__cards {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin: 0 0 1rem;
}

.vx-stack__card {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: start;
  gap: 0.5rem 1rem;
  padding: 1rem 1.1rem;
  background: #fff;
  border: 1px solid var(--vx-stack-border);
  border-radius: var(--vx-stack-radius);
  cursor: pointer;
  transition: border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.vx-stack__card:hover { border-color: rgba(23, 40, 65, 0.35); }

.vx-stack__card.is-selected {
  border-color: var(--vx-stack-primary);
  background: var(--vx-stack-primary-tint);
  box-shadow: 0 0 0 1px var(--vx-stack-primary) inset;
}

.vx-stack__card-badge {
  position: absolute;
  top: -10px;
  left: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #fff;
  background: var(--vx-stack-primary);
  border-radius: var(--vx-stack-radius-pill);
}

.vx-stack__card-badge--gold { background: var(--vx-stack-gold); }
.vx-stack__card-badge-star { font-size: 0.7rem; line-height: 1; }

.vx-stack__card-name {
  margin: 0 0 0.2rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--cp-text, #1a1a1a);
  line-height: 1.2;
}

.vx-stack__card-components {
  margin: 0 0 0.5rem;
  font-size: 0.82rem;
  color: var(--cp-text-muted, rgba(26, 26, 26, 0.72));
  line-height: 1.4;
}

.vx-stack__card-desc {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--vx-stack-primary);
}

.vx-stack__card-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.25rem;
  text-align: right;
  min-width: 5rem;
}

.vx-stack__card-price {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--cp-text, #1a1a1a);
  line-height: 1;
}

.vx-stack__card-pervial {
  font-size: 0.75rem;
  color: var(--cp-text-soft, rgba(26, 26, 26, 0.55));
}

.vx-stack__card-vials {
  margin-top: auto;
  padding: 0.18rem 0.55rem;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--cp-text-muted, rgba(26, 26, 26, 0.72));
  background: var(--cp-bg-subtle, #f3f4f8);
  border-radius: var(--vx-stack-radius-pill);
}

.vx-stack__card.is-selected .vx-stack__card-vials {
  background: var(--vx-stack-primary);
  color: #fff;
}

/* ---- BOGO tier cards (Just This tab) ---- */
.vx-stack__tiers {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin: 0 0 1rem;
}

.vx-stack__tier {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.1rem;
  background: #fff;
  border: 1px solid var(--vx-stack-border);
  border-radius: var(--vx-stack-radius);
  cursor: pointer;
  transition: border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.vx-stack__tier:hover { border-color: rgba(23, 40, 65, 0.35); }

.vx-stack__tier.is-selected {
  border-color: var(--vx-stack-primary);
  background: var(--vx-stack-primary-tint);
  box-shadow: 0 0 0 1px var(--vx-stack-primary) inset;
}

.vx-stack__tier-radio {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border: 2px solid var(--vx-stack-border);
  border-radius: 50%;
  background: #fff;
  flex-shrink: 0;
  transition: border-color 0.18s ease;
}

.vx-stack__tier.is-selected .vx-stack__tier-radio {
  border-color: var(--vx-stack-primary);
}

.vx-stack__tier-radio-dot {
  width: 10px;
  height: 10px;
  background: var(--vx-stack-primary);
  border-radius: 50%;
  opacity: 0;
  transform: scale(0.6);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.vx-stack__tier.is-selected .vx-stack__tier-radio-dot {
  opacity: 1;
  transform: scale(1);
}

.vx-stack__tier-info { min-width: 0; }

.vx-stack__tier-name {
  margin: 0 0 0.15rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--cp-text, #1a1a1a);
  line-height: 1.2;
}

.vx-stack__tier-sub {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--vx-stack-primary);
}

.vx-stack__tier-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.15rem;
  text-align: right;
  min-width: 5rem;
}

.vx-stack__tier-price {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--cp-text, #1a1a1a);
  line-height: 1;
}

.vx-stack__tier-pervial {
  font-size: 0.75rem;
  color: var(--cp-text-soft, rgba(26, 26, 26, 0.55));
}

.vx-stack__tier-badge {
  position: absolute;
  top: -10px;
  right: 1rem;
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.7rem;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #fff;
  background: var(--vx-stack-primary);
  border-radius: var(--vx-stack-radius-pill);
}

.vx-stack__tier-badge--dark   { background: var(--vx-stack-primary); }
.vx-stack__tier-badge--primary { background: var(--vx-stack-primary); }

/* ---- Strength selector (for variants like GLP-3 RT 10mg / 30mg) ---- */
.vx-stack__panel-sublabel {
  margin: 0.5rem 0 0.5rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(23, 40, 65, 0.55);
}

.vx-stack__strengths {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.55rem;
  margin: 0 0 1rem;
}

.vx-stack__strength {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 0.6rem;
  background: #fff;
  border: 1px solid var(--vx-stack-border);
  border-radius: var(--vx-stack-radius);
  cursor: pointer;
  transition: border-color 0.18s ease, background 0.18s ease, box-shadow 0.18s ease;
  min-height: 64px;
}

.vx-stack__strength:hover { border-color: rgba(23, 40, 65, 0.35); }

.vx-stack__strength.is-selected {
  border-color: var(--vx-stack-primary);
  background: var(--vx-stack-primary-tint);
  box-shadow: 0 0 0 1px var(--vx-stack-primary) inset;
}

.vx-stack__strength-label {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--vx-stack-primary);
}

.vx-stack__strength-badge {
  position: absolute;
  top: -0.55rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.2rem 0.55rem;
  background: var(--vx-stack-primary);
  color: #fff;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: 999px;
  white-space: nowrap;
}

/* ---- BOGO promo line + Add to cart button ---- */
.vx-stack__bogo {
  padding: 0.75rem 1rem;
  margin: 0 0 0.75rem;
  font-size: 0.82rem;
  font-weight: 600;
  text-align: center;
  color: var(--vx-stack-primary);
  background: var(--vx-stack-primary-tint);
  border-radius: var(--vx-stack-radius-sm);
}

.vx-stack__bogo:empty { display: none; }

.vx-stack__add {
  display: block;
  width: 100%;
  padding: 1rem 1.25rem;
  margin: 0 0 0.85rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  background: #16a34a;
  border: none;
  border-radius: var(--vx-stack-radius-sm);
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(22, 163, 74, 0.28);
  transition: background 0.18s ease, transform 0.1s ease, box-shadow 0.18s ease;
}

.vx-stack__add:hover {
  background: #15803d;
  box-shadow: 0 6px 16px rgba(22, 163, 74, 0.36);
}
.vx-stack__add:active { transform: translateY(1px); box-shadow: 0 2px 8px rgba(22, 163, 74, 0.28); }
.vx-stack__add:disabled { opacity: 0.65; cursor: wait; box-shadow: none; }

.vx-stack__footer-meta {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  align-items: center;
  text-align: center;
}

.vx-stack__footer-tags {
  margin: 0;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--vx-stack-primary);
}

.vx-stack__footer-cat {
  margin: 0;
  font-size: 0.78rem;
  color: var(--cp-text-muted, rgba(26, 26, 26, 0.72));
}

/* ---- Responsive ---- */
@media (max-width: 640px) {
  .vx-stack__tab {
    font-size: 0.85rem;
    padding: 0.55rem 0.3rem;
  }
  .vx-stack__tab-sub { font-size: 0.55rem; }

  .vx-stack__card { grid-template-columns: 1fr; }
  .vx-stack__card-right {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    min-width: 0;
  }

  .vx-stack__tier {
    grid-template-columns: auto 1fr;
    grid-template-rows: auto auto;
    row-gap: 0.4rem;
  }
  .vx-stack__tier-right {
    grid-column: 1 / -1;
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    width: 100%;
    padding-left: 2.4rem; /* align with text after radio */
  }
}