/* ══════════════════════════════════════════════════════════
   956 Labs — Mobile & Tablet Styles
   Rebuilt from ground up. Mobile-first.
   Breakpoints:
     max-width: 480px  = small phone
     max-width: 767px  = phone / phablet
     max-width: 1023px = tablet portrait
     min-width: 768px  = tablet+ (desktop nav visible)
     min-width: 1024px = laptop+
══════════════════════════════════════════════════════════ */

/* ── BASE RESETS FOR MOBILE ──────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}

/* Prevent iOS input zoom */
input, select, textarea {
  font-size: 16px !important;
}

/* Touch targets — minimum 44px */
button, a, [role="button"] {
  -webkit-tap-highlight-color: transparent;
}

/* ── NAV — DESKTOP (768px+) ──────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 200;
  background: #FFFFFF;
  border-bottom: 1px solid #E0E0E0;
  height: 62px;
  display: flex;
  align-items: center;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 12px;
}

@media (min-width: 1024px) {
  .nav-inner { padding: 0 32px; }
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  flex-shrink: 0;
  text-decoration: none;
}

.nav-links {
  display: none;
  gap: 2px;
  align-items: center;
}

@media (min-width: 768px) {
  .nav-links { display: flex; }
}

.nav-link {
  font-family: var(--font-c);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: #555;
  padding: 6px 12px;
  transition: color .18s;
  text-decoration: none;
}

.nav-link:hover  { color: #111; }
.nav-link.active { color: #006847; }

.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.nav-signout {
  font-family: var(--font-c);
  font-size: .66rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  background: transparent;
  color: #888;
  padding: 6px 10px;
  border: 1px solid #E0E0E0;
  cursor: pointer;
  transition: color .18s, border-color .18s;
}

.nav-signout:hover { color: #111; border-color: #999; }

.cart-nav-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-c);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: #006847;
  padding: 7px 16px;
  border: 1px solid rgba(0,104,71,.5);
  background: transparent;
  cursor: pointer;
  transition: background .18s, border-color .18s;
  position: relative;
  text-decoration: none;
}

.cart-nav-btn:hover {
  background: rgba(0,104,71,.08);
  border-color: #006847;
}

.cart-badge {
  background: #006847;
  color: #fff;
  font-size: .52rem;
  font-weight: 800;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  line-height: 1;
}

/* ── NAV — MOBILE (max 767px) ────────────────────────── */
@media (max-width: 767px) {
  nav {
    height: 56px;
    position: sticky;
    top: 0;
    z-index: 200;
  }

  .nav-inner {
    padding: 0;
    height: 56px;
    display: flex;
    flex-direction: row;
    align-items: stretch;
    justify-content: stretch;
    gap: 0;
    max-width: 100%;
  }

  /* Brand hidden — tabs fill the bar */
  .nav-brand { display: none !important; }

  /* Nav links and right become transparent flex containers */
  .nav-links {
    display: contents !important;
  }

  .nav-right {
    display: contents !important;
  }

  /* Sign out button — hidden, accessed via dashboard */
  .nav-signout { display: none !important; }

  /* Every nav-link and cart btn becomes a tab */
  .nav-link,
  .cart-nav-btn {
    flex: 1 1 0 !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 3px !important;
    padding: 6px 2px !important;
    height: 56px !important;
    min-height: 56px !important;
    color: #777 !important;
    background: transparent !important;
    border: none !important;
    border-right: 1px solid #E8E8E8 !important;
    font-size: .48rem !important;
    letter-spacing: .08em !important;
    text-decoration: none !important;
    clip-path: none !important;
    position: relative;
    transition: color .18s, background .18s;
    text-align: center;
  }

  .nav-link:last-of-type,
  .cart-nav-btn { border-right: none !important; }

  .nav-link.active {
    color: #006847 !important;
    background: rgba(0,104,71,.07) !important;
    border-bottom: 2px solid #006847 !important;
  }

  .nav-link:active,
  .cart-nav-btn:active {
    background: rgba(0,0,0,.04) !important;
  }

  /* Tab icons */
  .nav-icon {
    display: block !important;
    font-size: 1.1rem !important;
    line-height: 1 !important;
  }

  .nav-label {
    display: block !important;
    font-size: .44rem !important;
  }

  /* Cart badge repositioned */
  .cart-badge {
    position: absolute !important;
    top: 7px !important;
    right: calc(50% - 20px) !important;
    width: 14px !important;
    height: 14px !important;
    font-size: .44rem !important;
  }
}

/* ── RESEARCH BANNER ─────────────────────────────────── */
.research-banner {
  background: #F6F6F6;
  border-bottom: 1px solid #E0E0E0;
  padding: 7px 16px;
  text-align: center;
}

@media (min-width: 768px) {
  .research-banner { padding: 9px 32px; }
}

.research-banner p {
  font-family: var(--font-c);
  font-size: .6rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: #006847;
  display: inline;
}

.research-banner p span {
  color: #888;
  font-weight: 400;
  letter-spacing: .04em;
  text-transform: none;
  font-family: var(--font-b);
}

@media (max-width: 767px) {
  .research-banner p span { display: none; }
}

/* ── FOOTER ──────────────────────────────────────────── */
footer {
  background: #F6F6F6;
  border-top: 1px solid #E0E0E0;
  padding: 20px 0;
  margin-top: auto;
}

@media (min-width: 768px) { footer { padding: 32px 0; } }

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

@media (min-width: 768px)  { .footer-inner { padding: 0 28px; } }
@media (min-width: 1024px) { .footer-inner { padding: 0 32px; } }

.footer-copy {
  font-family: var(--font-c);
  font-size: .58rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: #888;
}

@media (max-width: 480px) {
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 6px; }
  .footer-copy { font-size: .54rem; }
}

/* ── CONTAINER ───────────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
  width: 100%;
}

@media (min-width: 480px)  { .container { padding: 0 20px; } }
@media (min-width: 768px)  { .container { padding: 0 28px; } }
@media (min-width: 1024px) { .container { padding: 0 32px; } }

/* ══════════════════════════════════════════════════════
   SHOP PAGE (index.html)
══════════════════════════════════════════════════════ */

.shop-header {
  padding: 48px 0 36px;
  border-bottom: 1px solid #E0E0E0;
}

@media (max-width: 767px) {
  .shop-header { padding: 28px 0 20px; }
}

.shop-title {
  font-family: var(--font-d);
  font-size: clamp(2.4rem, 6vw, 4.8rem);
  line-height: .92;
  letter-spacing: .03em;
  color: #111;
}

@media (max-width: 767px) {
  .shop-title { font-size: clamp(2rem, 9vw, 2.8rem); }
}

/* Filters bar */
.filters-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 0;
  flex-wrap: wrap;
}

@media (max-width: 767px) {
  .filters-bar {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 14px 0;
    gap: 6px;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  .filters-bar::-webkit-scrollbar { display: none; }
  .filters-label { display: none; }
  .filter-btn { flex-shrink: 0; white-space: nowrap; }
}

/* Products grid */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

@media (max-width: 900px) {
  .products-grid { grid-template-columns: repeat(3, 1fr); gap: 12px; }
}

@media (max-width: 700px) {
  .products-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
}

@media (max-width: 380px) {
  .products-grid { grid-template-columns: 1fr; gap: 10px; }
}

/* Product card */
.product-card {
  background: #FFFFFF;
  border: 1px solid #E0E0E0;
  display: flex;
  flex-direction: column;
  transition: border-color .2s, transform .2s, box-shadow .2s;
}

@media (hover: hover) {
  .product-card:hover {
    border-color: #006847;
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0,0,0,.1);
  }
}

.product-thumb {
  background: #F0F0F0;
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-bottom: 1px solid #E8E8E8;
}

@media (max-width: 700px) { .product-thumb { height: 160px; } }
@media (max-width: 480px) { .product-thumb { height: 140px; } }

.product-thumb img {
  max-width: 85%;
  max-height: 85%;
  object-fit: contain;
}

.product-info {
  padding: 16px 18px 18px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

@media (max-width: 700px) { .product-info { padding: 12px 12px 14px; } }

.product-name {
  font-family: var(--font-c);
  font-size: .92rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: #111;
  margin-bottom: 4px;
}

@media (max-width: 700px) { .product-name { font-size: .8rem; } }

.product-desc {
  font-size: .78rem;
  color: #666;
  line-height: 1.5;
  margin-bottom: 10px;
}

@media (max-width: 700px) { .product-desc { display: none; } }

.product-price {
  font-family: var(--font-d);
  font-size: 1.4rem;
  color: #111;
  margin-top: auto;
}

@media (max-width: 700px) { .product-price { font-size: 1.2rem; } }

/* ══════════════════════════════════════════════════════
   PRODUCT PAGE
══════════════════════════════════════════════════════ */

.product-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

@media (max-width: 860px) {
  .product-layout {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .product-visual { position: static !important; }
}

.product-visual {
  position: sticky;
  top: 74px;
}

@media (max-width: 767px) {
  .product-page { padding: 28px 0 60px; }
  .breadcrumb { padding: 12px 0; font-size: .6rem; }
}

/* Lab report */
.lab-report-section {
  display: flex;
  align-items: flex-start;
  gap: 24px;
}

@media (max-width: 600px) {
  .lab-report-section { flex-direction: column-reverse; gap: 14px; }
  .lab-report-doc { width: 160px !important; }
}

/* Reviews */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

@media (max-width: 600px) {
  .reviews-grid { grid-template-columns: 1fr; }
}

/* Add to cart button */
.add-to-cart-btn {
  width: 100%;
  min-height: 48px;
  touch-action: manipulation;
}

@media (max-width: 767px) {
  .product-info-col { padding-bottom: 40px; }
}

/* ══════════════════════════════════════════════════════
   CART PAGE
══════════════════════════════════════════════════════ */

.cart-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 32px;
  align-items: start;
}

@media (max-width: 1023px) {
  .cart-layout { grid-template-columns: 1fr 300px; gap: 24px; }
}

@media (max-width: 800px) {
  .cart-layout {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .cart-items-col { order: 2; margin-top: 20px; }
  .summary-panel {
    order: 1;
    position: static !important;
    margin-bottom: 0;
  }
}

.cart-item {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 18px 0;
  border-bottom: 1px solid #E8E8E8;
}

@media (max-width: 480px) {
  .cart-item {
    grid-template-columns: 52px 1fr auto;
    gap: 10px;
    padding: 14px 0;
  }
}

.cart-item-thumb {
  width: 72px;
  height: 72px;
  background: #F0F0F0;
  border: 1px solid #E0E0E0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
}

@media (max-width: 480px) {
  .cart-item-thumb { width: 52px; height: 52px; }
}

.cart-item-thumb img {
  max-width: 80%;
  max-height: 80%;
  object-fit: contain;
}

.qty-btn {
  width: 36px;
  height: 36px;
  min-width: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: manipulation;
}

@media (max-width: 480px) {
  .qty-btn { width: 32px; height: 32px; min-width: 32px; }
}

.summary-panel {
  background: #F6F6F6;
  border: 1px solid #E0E0E0;
  padding: 24px;
  position: sticky;
  top: 74px;
}

@media (max-width: 800px) {
  .summary-panel { padding: 20px; }
}

.checkout-btn {
  width: 100%;
  min-height: 52px;
  font-size: .78rem;
  touch-action: manipulation;
}

/* Discount input */
.discount-row {
  display: flex;
  gap: 8px;
}

@media (max-width: 380px) {
  .discount-row { flex-direction: column; }
}

/* ══════════════════════════════════════════════════════
   ORDERS PAGE
══════════════════════════════════════════════════════ */

.orders-summary {
  display: flex;
  gap: 32px;
  padding: 24px 0 28px;
  border-bottom: 1px solid #E0E0E0;
  flex-wrap: wrap;
}

@media (max-width: 480px) {
  .orders-summary { gap: 20px; padding: 16px 0 20px; }
  .summary-stat-val { font-size: 1.6rem !important; }
}

.order-card {
  border: 1px solid #E0E0E0;
  background: #FFFFFF;
  box-shadow: 0 2px 8px rgba(0,0,0,.05);
  margin-bottom: 12px;
}

.order-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  border-bottom: 1px solid #F0F0F0;
}

@media (max-width: 480px) {
  .order-row { gap: 10px; padding: 12px; }
}

.order-thumb {
  width: 48px;
  height: 48px;
  background: #F0F0F0;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

@media (max-width: 480px) {
  .order-thumb { width: 40px; height: 40px; }
}

.order-thumb img {
  max-width: 80%;
  max-height: 80%;
  object-fit: contain;
}

/* ══════════════════════════════════════════════════════
   DASHBOARD PAGE
══════════════════════════════════════════════════════ */

.dash-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 767px) {
  .dash-grid { grid-template-columns: 1fr; gap: 14px; }
  .dash-header { padding: 28px 0 20px !important; }
}

.dash-card {
  background: #FFFFFF;
  border: 1px solid #E0E0E0;
  padding: 20px;
}

@media (max-width: 480px) {
  .dash-card { padding: 16px; }
}

/* ══════════════════════════════════════════════════════
   CHECKOUT MODAL
══════════════════════════════════════════════════════ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  backdrop-filter: blur(4px);
  z-index: 500;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s;
  padding: 0;
  -webkit-overflow-scrolling: touch;
}

@media (min-width: 600px) {
  .modal-overlay {
    align-items: center;
    padding: 20px;
  }
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: #FFFFFF;
  border: 1px solid #E0E0E0;
  width: 100%;
  max-width: 100%;
  max-height: 92vh;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  transform: translateY(30px);
  transition: transform .28s;
  border-radius: 0;
  display: flex;
  flex-direction: column;
}

@media (min-width: 600px) {
  .modal {
    max-width: 580px;
    max-height: 88vh;
    border-radius: 2px;
    transform: translateY(20px);
  }
}

.modal-overlay.open .modal { transform: translateY(0); }

.modal::-webkit-scrollbar { width: 4px; }
.modal::-webkit-scrollbar-thumb { background: #D0D0D0; }

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
  border-bottom: 1px solid #E0E0E0;
  position: sticky;
  top: 0;
  background: #F6F6F6;
  z-index: 1;
}

@media (min-width: 600px) {
  .modal-head { padding: 20px 28px; }
}

.modal-body { padding: 16px 18px 24px; }

@media (min-width: 600px) {
  .modal-body { padding: 24px 28px 32px; }
}

.modal-section { margin-bottom: 22px; }

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

@media (min-width: 480px) {
  .form-row { grid-template-columns: 1fr 1fr; gap: 12px; }
}

.form-field { margin-bottom: 12px; }

.form-field input,
.form-field select {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  font-size: 16px !important; /* prevents iOS zoom */
  background: #FFFFFF;
  border: 1px solid #D8D8D8;
  color: #111;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  border-radius: 0;
}

.form-field input:focus,
.form-field select:focus {
  border-color: #006847;
  box-shadow: 0 0 0 3px rgba(0,104,71,.1);
}

/* Payment method buttons */
.pay-method-btns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

@media (max-width: 420px) {
  .pay-method-btns { grid-template-columns: 1fr; }
}

.pay-method-btn {
  min-height: 48px;
  touch-action: manipulation;
}

.modal-submit {
  width: 100%;
  min-height: 52px;
  font-size: .78rem;
  touch-action: manipulation;
}

/* ══════════════════════════════════════════════════════
   AUTH POPUP (login/register)
══════════════════════════════════════════════════════ */

#auth-popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  backdrop-filter: blur(4px);
  z-index: 600;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
}

@media (min-width: 480px) {
  #auth-popup-overlay {
    align-items: center;
    padding: 20px;
  }
}

#auth-popup-overlay > div:last-child {
  width: 100%;
  max-width: 100%;
  max-height: 95vh;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: 0;
}

@media (min-width: 480px) {
  #auth-popup-overlay > div:last-child {
    max-width: 420px;
    border-radius: 4px;
  }
}

/* ══════════════════════════════════════════════════════
   UNSUBSCRIBE POPUP
══════════════════════════════════════════════════════ */

#unsub-overlay {
  padding: 16px;
}

@media (min-width: 480px) {
  #unsub-overlay { padding: 20px; }
}

#unsub-box {
  width: 100%;
  max-width: 380px;
}

/* ══════════════════════════════════════════════════════
   TABLET ADJUSTMENTS (768px – 1023px)
══════════════════════════════════════════════════════ */

@media (min-width: 768px) and (max-width: 1023px) {
  /* Products grid — 3 col on tablet */
  .products-grid { grid-template-columns: repeat(3, 1fr) !important; }

  /* Cart layout — single column on small tablet */
  .cart-layout { grid-template-columns: 1fr 280px; }

  /* Product page — single column on tablet portrait */
  @media (max-width: 900px) {
    .product-layout { grid-template-columns: 1fr; }
  }

  /* Modal — larger */
  .modal { max-width: 560px; }
}

/* ══════════════════════════════════════════════════════
   GLOBAL TOUCH & INTERACTION FIXES
══════════════════════════════════════════════════════ */

/* Smooth momentum scrolling */
.modal, .filters-bar, .products-section {
  -webkit-overflow-scrolling: touch;
}

/* Remove 300ms tap delay */
a, button, [role="button"] {
  touch-action: manipulation;
}

/* Skeleton loading */
.skeleton-thumb {
  background: #EBEBEB;
  background: linear-gradient(90deg, #EBEBEB 25%, #F5F5F5 50%, #EBEBEB 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.4s infinite;
}

@keyframes skeleton-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Page title clamp */
.shop-title,
.cart-page-title,
.orders-title,
.dashboard-title,
.dash-greeting {
  word-break: break-word;
}

/* Ensure page fills viewport */
body { display: flex; flex-direction: column; min-height: 100vh; }
main, .page-main { flex: 1; }