/* === BioStack Mini App — tokens + catalog. Light theme only (spec §6.3). === */

:root {
  --bg: #FFFFFF;
  --bg-section: #F8F9FA;
  --accent: #2ECC71;
  --accent-dark: #1A7A3A;
  --text: #1A1A2E;
  --text-muted: #6B7280;
  --border: #E5E7EB;
  --success: #10B981;
  --warning: #F59E0B;
  --error: #EF4444;

  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, "Helvetica Neue", Arial, sans-serif;
  --header-h: 56px;

  --duration-fast: 100ms;
  --duration-med: 150ms;
  --duration-slow: 300ms;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

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

/* --- Header --- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.app-header__logo {
  font-weight: 700;
  font-size: 18px;
  color: var(--accent-dark);
  letter-spacing: -0.01em;
}
.app-header__actions {
  display: inline-flex;
  align-items: center;
  gap: 2px;
}
.app-header__icon-btn {
  position: relative;
  padding: 8px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  color: var(--text);
  transition: transform var(--duration-fast), background var(--duration-med);
}
.app-header__icon-btn:active {
  transform: scale(0.92);
  background: var(--bg-section);
}
.app-header__cart-count {
  position: absolute;
  top: 2px;
  right: 2px;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 999px;
  min-width: 18px;
  text-align: center;
  line-height: 1;
}

/* --- Main --- */
.app-main {
  padding: 16px;
  max-width: 1024px;
  margin: 0 auto;
  min-height: calc(100vh - var(--header-h));
}

.error-banner {
  padding: 14px;
  background: color-mix(in srgb, var(--error) 8%, transparent);
  color: var(--error);
  border: 1px solid color-mix(in srgb, var(--error) 30%, transparent);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  font-size: 14px;
}

/* --- Category strip --- */
.category-strip {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin: 0 -16px 16px;
  padding: 0 16px 4px;
  scrollbar-width: none;
}
.category-strip::-webkit-scrollbar {
  display: none;
}
.category-chip {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--bg-section);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 14px;
  color: var(--text);
  white-space: nowrap;
  transition: background var(--duration-med), border-color var(--duration-med), color var(--duration-med);
}
.category-chip--active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.category-chip:active {
  transform: scale(0.96);
}
.category-chip__emoji {
  font-size: 15px;
}

/* --- Product grid / card --- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
@media (min-width: 600px) { .product-grid { grid-template-columns: repeat(3, 1fr); gap: 16px; } }
@media (min-width: 900px) { .product-grid { grid-template-columns: repeat(4, 1fr); } }

.product-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: transform var(--duration-med), box-shadow var(--duration-med), border-color var(--duration-med);
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: color-mix(in srgb, var(--accent) 25%, var(--border));
}
.product-card:active {
  transform: scale(0.98);
}
.product-card__image {
  aspect-ratio: 1 / 1;
  background: var(--bg-section);
  overflow: hidden;
}
.product-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.product-card__body {
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}
.product-card__name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.product-card__price {
  margin-top: auto;
  font-size: 15px;
  font-weight: 700;
  color: var(--accent-dark);
}
.product-card__oos {
  font-size: 11px;
  color: var(--warning);
  font-weight: 500;
}

/* --- Skeleton loading --- */
.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
@media (min-width: 600px) { .skeleton-grid { grid-template-columns: repeat(3, 1fr); gap: 16px; } }
@media (min-width: 900px) { .skeleton-grid { grid-template-columns: repeat(4, 1fr); } }

.skeleton {
  background: linear-gradient(90deg, var(--bg-section), color-mix(in srgb, var(--bg-section) 60%, var(--border)), var(--bg-section));
  background-size: 200% 100%;
  animation: skeleton-pulse 1.2s linear infinite;
  border-radius: var(--radius);
}
.skeleton--card {
  aspect-ratio: 0.7;
}

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

/* === Common UI === */
.page-title {
  font-size: 22px;
  font-weight: 700;
  margin: 8px 0 16px;
  color: var(--text);
}

.back-btn {
  font-size: 15px;
  color: var(--accent-dark);
  padding: 8px 0 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.back-btn:active { transform: translateX(-2px); transition: transform var(--duration-fast); }

.loading {
  text-align: center;
  color: var(--text-muted);
  padding: 40px 0;
}

.empty-state {
  text-align: center;
  padding: 48px 16px;
  color: var(--text-muted);
}
.empty-state__icon { font-size: 56px; margin-bottom: 12px; }
.empty-state__text { font-size: 18px; color: var(--text); font-weight: 600; margin-bottom: 4px; }
.empty-state__hint { font-size: 14px; margin-bottom: 24px; }

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  transition: transform var(--duration-fast), background var(--duration-med), opacity var(--duration-med);
}
.btn:active { transform: scale(0.96); }
.btn:disabled { opacity: 0.4; pointer-events: none; }
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--accent-dark); }
.btn--ghost { background: transparent; color: var(--text-muted); }
.btn--ghost:hover { background: var(--bg-section); color: var(--text); }
.btn--full { width: 100%; }
.btn--lg { padding: 14px 24px; font-size: 16px; }
.btn--flex { flex: 1; }

/* === Quantity controls === */
.qty-controls {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-section);
  padding: 4px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.qty-controls--lg { padding: 8px; }
.qty-btn {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--accent-dark);
  font-size: 18px;
  line-height: 1;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background var(--duration-med), transform var(--duration-fast);
}
.qty-controls--lg .qty-btn { width: 36px; height: 36px; font-size: 20px; }
.qty-btn:active { transform: scale(0.9); }
.qty-btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.qty-value {
  min-width: 28px;
  text-align: center;
  font-weight: 600;
  font-size: 15px;
}
.qty-controls--lg .qty-value { min-width: 40px; font-size: 17px; }

/* === Product detail === */
.product-detail {
  background: var(--bg);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  margin-bottom: 90px; /* space for sticky cta bar */
}
.product-detail__image {
  aspect-ratio: 1 / 1;
  background: var(--bg-section);
  overflow: hidden;
}
.product-detail__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.product-detail__body {
  padding: 20px 16px 16px;
}
.product-detail__name {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 12px;
}
.product-detail__price-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.product-detail__price {
  font-size: 24px;
  font-weight: 800;
  color: var(--accent-dark);
}
.product-detail__short {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 20px;
}
.product-detail__section {
  padding: 16px 0;
  border-top: 1px solid var(--border);
}
.product-detail__section-title {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.product-detail__section-body {
  font-size: 14px;
  color: var(--text);
  line-height: 1.55;
  white-space: pre-wrap;
}
.product-detail__cta-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--border);
  display: flex;
  gap: 12px;
  z-index: 40;
}

/* === Cart === */
.cart-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}
.cart-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  display: grid;
  grid-template-columns: 72px 1fr auto;
  gap: 12px;
  align-items: center;
  position: relative;
}
.cart-item__image {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-sm);
  background: var(--bg-section);
  overflow: hidden;
  flex: 0 0 auto;
}
.cart-item__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.cart-item__body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}
.cart-item__name {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.cart-item__price-line {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}
.cart-item__price {
  font-size: 13px;
  color: var(--text-muted);
}
.cart-item__subtotal {
  font-size: 15px;
  font-weight: 700;
  color: var(--accent-dark);
}
.cart-item__remove {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-section);
  color: var(--text-muted);
  font-size: 18px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background var(--duration-med), color var(--duration-med);
}
.cart-item__remove:hover { background: var(--error); color: #fff; }

.cart-total {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 14px 4px;
  border-top: 2px solid var(--border);
  margin-top: 8px;
  margin-bottom: 16px;
}
.cart-total__label { font-size: 15px; font-weight: 600; color: var(--text-muted); }
.cart-total__value { font-size: 24px; font-weight: 800; color: var(--accent-dark); }

/* === Cart badge bump === */
.cart-bump {
  animation: cart-bump-anim 300ms cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes cart-bump-anim {
  0%   { transform: scale(1); }
  40%  { transform: scale(1.25); }
  100% { transform: scale(1); }
}

/* Scroll comfort */
#main { transition: opacity 120ms ease-out; }

/* === Forms === */
.form-stack {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
}
.form-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-field__label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.form-field__hint {
  font-size: 12px;
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
  color: var(--accent-dark);
}
.form-field__input {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  font-family: inherit;
  font-size: 15px;
  color: var(--text);
  transition: border-color var(--duration-med), box-shadow var(--duration-med);
}
.form-field__input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent);
}
textarea.form-field__input {
  resize: vertical;
  min-height: 60px;
}

/* === Summary card === */
.summary-card {
  background: var(--bg-section);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 4px 0 8px;
}
.summary-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  font-size: 14px;
  color: var(--text-muted);
}
.summary-row dt, .summary-row dd { font-size: 14px; }
.summary-row strong, .summary-row dd { color: var(--text); font-weight: 600; }
.summary-row--total {
  padding-top: 8px;
  border-top: 1px solid var(--border);
  font-size: 15px;
  color: var(--text);
}
.summary-row--total strong, .summary-row--total dd {
  font-size: 18px;
  font-weight: 800;
  color: var(--accent-dark);
}

/* === Order detail === */
.order-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}
.order-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}
.order-card__number { font-size: 18px; font-weight: 700; margin: 0; }
.order-card__date { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.order-card__shipping { padding: 12px 0 4px; border-top: 1px solid var(--border); margin-top: 12px; }
.order-card__shipping h3 { font-size: 13px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.03em; margin-bottom: 6px; }
.order-card__shipping p { font-size: 14px; margin: 2px 0; }
.order-card__shipping p.muted { color: var(--text-muted); }
.order-card__tracking { margin-top: 12px; font-size: 14px; padding: 10px 12px; background: var(--bg-section); border-radius: var(--radius-sm); }
.order-card__actions { display: flex; flex-direction: column; gap: 8px; padding-bottom: 24px; }

.order-items {
  list-style: none;
  padding: 12px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: 12px 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.order-item {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 14px;
}
.order-item__name { color: var(--text); }
.order-item__price { color: var(--accent-dark); font-weight: 600; }

/* === Status badge === */
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.4;
  background: var(--bg-section);
  color: var(--text-muted);
  text-transform: lowercase;
  white-space: nowrap;
}
.badge--new, .badge--awaiting_payment { background: color-mix(in srgb, var(--warning) 18%, transparent); color: #8a5a00; }
.badge--paid, .badge--confirmed, .badge--packing, .badge--shipped { background: color-mix(in srgb, var(--accent) 18%, transparent); color: var(--accent-dark); }
.badge--delivered { background: color-mix(in srgb, var(--success) 18%, transparent); color: #066; }
.badge--cancelled, .badge--failed { background: color-mix(in srgb, var(--error) 15%, transparent); color: var(--error); }
.badge--refund_requested, .badge--refunded { background: color-mix(in srgb, #9f7fe6 18%, transparent); color: #553; }

/* === Mock pay === */
.mock-pay-card {
  background: var(--bg);
  border: 1px dashed color-mix(in srgb, var(--warning) 50%, var(--border));
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
}
.mock-pay-card__icon { font-size: 48px; }
.mock-pay-card__title { font-size: 20px; font-weight: 700; margin: 0; }
.mock-pay-card__info { color: var(--text-muted); font-size: 14px; margin: 0; max-width: 26em; }
.mock-pay-card__meta {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 6px 14px;
  text-align: left;
  width: 100%;
  background: var(--bg-section);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
}
.mock-pay-card__meta dt { color: var(--text-muted); font-weight: 600; }
.mock-pay-card__meta dd { color: var(--text); font-weight: 500; }
.mock-pay-card__meta code { font-family: ui-monospace, monospace; font-size: 12px; background: var(--bg); padding: 1px 4px; border-radius: 3px; }

.muted { color: var(--text-muted); }

/* === Orders list === */
.orders-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.order-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color var(--duration-med), transform var(--duration-fast);
}
.order-row:hover { border-color: color-mix(in srgb, var(--accent) 25%, var(--border)); }
.order-row:active { transform: scale(0.99); }
.order-row__main { min-width: 0; }
.order-row__num { font-weight: 700; font-size: 15px; }
.order-row__date { font-size: 12px; margin-top: 2px; }
.order-row__right { display: flex; flex-direction: column; align-items: flex-end; gap: 4px; }
.order-row__total { font-weight: 700; color: var(--accent-dark); font-size: 15px; }

/* === Profile === */
.profile-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 8px 0 18px;
}
.avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 15%, var(--bg));
  color: var(--accent-dark);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  flex: 0 0 auto;
}
.profile-name { font-size: 18px; font-weight: 700; }
.profile-rank { font-size: 13px; color: var(--text-muted); margin-top: 2px; }

.profile-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 18px;
}
.profile-stat {
  padding: 12px 14px;
  background: var(--bg-section);
  border-radius: var(--radius);
}
.profile-stat__label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 4px;
}
.profile-stat__value {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.profile-nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.profile-link {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: 15px;
  text-align: left;
  color: var(--text);
  cursor: pointer;
  transition: border-color var(--duration-med), background var(--duration-med);
}
.profile-link:hover { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 5%, var(--bg)); }
.profile-link:active { transform: scale(0.99); }

/* === Referral === */
.referral-intro {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 16px;
  line-height: 1.5;
}
.referral-card {
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--accent) 10%, var(--bg)),
    color-mix(in srgb, var(--accent) 4%, var(--bg)));
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--border));
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
  text-align: center;
}
.referral-code {
  font-family: ui-monospace, "SF Mono", monospace;
  font-size: 24px;
  font-weight: 800;
  color: var(--accent-dark);
  letter-spacing: 0.1em;
}
.referral-link {
  font-size: 12px;
  color: var(--text-muted);
  word-break: break-all;
}