/**
 * Unified responsive system (public site + shared chrome).
 * Breakpoints align with design-tokens: sm 640, md 768, lg 1024.
 */

/* === Global overflow guard === */
html {
  overflow-x: clip;
}

body {
  overflow-x: clip;
  max-width: 100%;
}

img,
video,
iframe,
svg {
  max-width: 100%;
  height: auto;
}

.page-wrap,
.site-header,
.card,
.hero-section,
.grid,
.grid-2,
.grid--catalog,
.grid--order,
.contact-layout,
.footer-grid {
  min-width: 0;
}

/* === Mobile-first spacing & type (phones) === */
@media (max-width: 639px) {
  :root {
    --text-2xl: 24px;
    --text-xl: 20px;
    --text-lg: 17px;
    --layout-gap: var(--space-4);
    --section-gap: var(--space-5);
  }

  .page-wrap {
    padding-inline: var(--space-3);
    padding-bottom: calc(var(--space-7) + env(safe-area-inset-bottom));
  }

  .stack--loose {
    gap: var(--space-5);
  }

  h1 {
    font-size: var(--text-2xl);
    line-height: 1.15;
    overflow-wrap: anywhere;
  }

  h2 {
    font-size: var(--text-xl);
    overflow-wrap: anywhere;
  }

  .card {
    padding: var(--space-4);
  }

  .hero-section {
    padding: var(--space-4);
    gap: var(--space-4);
    border-radius: var(--radius-lg);
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2);
  }

  .stat-card {
    padding: var(--space-3);
  }

  .stat-card h2 {
    font-size: var(--text-lg);
  }

  .section-head {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
  }

  .section-head .btn {
    width: 100%;
    justify-content: center;
  }

  .faq-button {
    font-size: var(--text-sm);
    padding: var(--space-3) var(--space-4);
  }

  .footer-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }

  .footer-meta .small {
    font-size: var(--text-xs);
    line-height: 1.4;
  }

  .auth-card {
    padding: var(--space-4);
  }

  .page-wrap--center {
    min-height: calc(100dvh - var(--space-6));
  }

  .table-wrap {
    width: 100%;
    max-width: 100%;
  }

  .table-wrap table {
    min-width: 520px;
  }
}

/* === Tablet === */
@media (min-width: 640px) and (max-width: 1023px) {
  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid--catalog {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* === Mobile header & navigation (< lg) === */
.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
}

.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast);
}

.mobile-menu-btn:hover {
  background: var(--color-surface-alt);
}

.mobile-menu-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.mobile-menu-btn[aria-expanded="true"] {
  border-color: color-mix(in srgb, var(--color-accent) 45%, var(--color-border));
  background: color-mix(in srgb, var(--color-accent) 12%, var(--color-surface));
}

@media (max-width: 1023px) {
  .site-header {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-bottom: var(--space-5);
  }

  .mobile-menu-btn {
    display: inline-flex;
  }

  .main-nav {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    max-height: min(70vh, 480px);
    overflow-y: auto;
    overflow-x: hidden;
    margin-top: var(--space-3);
    padding: var(--space-2);
    gap: var(--space-1);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    -webkit-overflow-scrolling: touch;
  }

  .main-nav.active {
    display: flex;
  }

  .main-nav a,
  .main-nav .inline-form {
    width: 100%;
  }

  .main-nav a {
    justify-content: flex-start;
    border-radius: var(--radius-md);
    white-space: normal;
    text-align: left;
  }

  .main-nav .inline-form .btn {
    width: 100%;
  }
}

@media (min-width: 1024px) {
  .site-header {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .site-header__bar {
    width: auto;
    flex: 0 0 auto;
  }

  .main-nav {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: flex-end;
    width: auto;
    flex: 1 1 auto;
    overflow: visible;
    margin-top: 0;
    padding: 0;
    border: none;
    background: transparent;
    max-height: none;
  }
}

/* === Bottom tab bar (injected by app-ui.js) === */
.mobile-tabs {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-dropdown);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
  gap: var(--space-1);
  min-height: 56px;
  padding: var(--space-1) var(--space-2) calc(var(--space-2) + env(safe-area-inset-bottom));
  border-top: 1px solid var(--color-border);
  background: rgba(15, 15, 19, 0.97);
  backdrop-filter: blur(12px);
}

.mobile-tabs a {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-height: 44px;
  padding: var(--space-1);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  text-align: center;
  line-height: 1.2;
  transition:
    color var(--transition-fast),
    background var(--transition-fast);
}

.mobile-tabs a span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
}

.mobile-tabs a.is-active {
  color: var(--color-text);
  background: var(--color-surface-alt);
}

@media (hover: hover) {
  .mobile-tabs a:hover {
    color: var(--color-text);
    background: color-mix(in srgb, var(--color-surface-alt) 80%, transparent);
  }
}

body.has-mobile-tabs {
  padding-bottom: calc(56px + env(safe-area-inset-bottom));
}

body.has-mobile-tabs .page-wrap {
  padding-bottom: calc(var(--space-7) + 56px + env(safe-area-inset-bottom));
}

@media (min-width: 1024px) {
  .mobile-tabs {
    display: none !important;
  }

  body.has-mobile-tabs {
    padding-bottom: 0;
  }
}

/* === Touch-friendly controls === */
@media (max-width: 1023px) {
  .btn,
  a.btn,
  .input,
  select.input,
  textarea.input {
    min-height: 48px;
  }

  .btn-inline {
    min-height: 44px;
  }
}

/* === Assistant vs bottom bar === */
@media (max-width: 1023px) {
  #assistantToggle {
    bottom: calc(64px + var(--space-3) + env(safe-area-inset-bottom));
    right: var(--space-3);
    max-width: calc(100vw - var(--space-6));
  }

  #assistantPanel {
    left: var(--space-3);
    right: var(--space-3);
    width: auto;
    bottom: calc(120px + env(safe-area-inset-bottom));
  }
}

/* === Grid: never 4-col on small screens for generic .grid === */
@media (max-width: 1023px) {
  .grid:not(.grid--catalog):not(.grid--order) {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 640px) and (max-width: 1023px) {
  .grid:not(.grid--catalog):not(.grid--order) {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* === Product cards on narrow phones === */
@media (max-width: 399px) {
  .grid--catalog,
  .grid--order {
    grid-template-columns: 1fr;
  }

  .product-card__price-tag {
    flex: 1 1 100%;
  }
}