/**
 * SMARTSHELF Base Styles
 * RTL First, Accessible, Responsive Foundation
 */

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: var(--lh-relaxed);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  /* Tracking/letter-spacing breaks Persian glyph joining */
  letter-spacing: 0;
  scroll-behavior: smooth;
  height: 100%;
}

body {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  overflow-x: hidden;
  transition: background-color var(--duration-normal) var(--ease-standard),
              color var(--duration-normal) var(--ease-standard);
}

/* RTL / LTR Root Handling */
html[dir="rtl"] {
  direction: rtl;
  text-align: start;
}

html[dir="ltr"] {
  direction: ltr;
  text-align: start;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: var(--font-weight-bold);
  line-height: var(--lh-tight);
  margin-block-end: var(--space-2);
  letter-spacing: 0;
}

h1 { font-size: var(--font-2xl); }
h2 { font-size: var(--font-xl); }
h3 { font-size: var(--font-lg); }
h4 { font-size: var(--font-base); }
h5 { font-size: var(--font-sm); }
h6 { font-size: var(--font-xs); }

p {
  margin-block-end: var(--space-3);
  line-height: var(--lh-relaxed);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-standard);
}

a:hover {
  text-decoration: underline;
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ==========================================================================
   Accessibility & Interactive Controls
   ========================================================================== */
:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: 1rem; /* >= 16px to prevent iOS auto-zoom */
  color: inherit;
  background: transparent;
  border: none;
}

button {
  cursor: pointer;
  touch-action: manipulation;
  user-select: none;
}

/* Minimum 44px touch target on interactive elements */
button,
.interactive-target,
.btn,
.nav-tab-item,
.stepper-btn {
  min-height: var(--min-touch-target);
  min-width: var(--min-touch-target);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Utility Containers */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}