/* ==========================================================================
   Base CSS
   Global design tokens, reset, document defaults, accessibility helpers.
   ========================================================================== */

/* Design Tokens */
:root {
  /* Primitive colors */
  --color-blue-900: #032d5a;
  --color-blue-850: #063568;
  --color-blue-800: #002b5c;
  --color-blue-700: #005eb8;
  --color-blue-600: #0878d1;
  --color-blue-650: #0067bb;
  --color-blue-500: #1168d5;
  --color-cyan-500: #08a9e2;
  --color-cyan-100: #dff5fc;
  --color-cyan-50: #eaf7fd;
  --color-gold-500: #ffb511;
  --color-orange-700: #9b4d00;
  --color-neutral-0: #fff;
  --color-neutral-50: #f9fbfc;
  --color-neutral-75: #f7f8f9;
  --color-neutral-100: #f2f4f6;
  --color-neutral-125: #f2f2f2;
  --color-neutral-150: #eaf7fd;
  --color-neutral-200: #e5e8eb;
  --color-neutral-225: #e7ebee;
  --color-neutral-250: #e2e6ea;
  --color-neutral-300: #d9dfe5;
  --color-neutral-350: #c9d1d8;
  --color-neutral-400: #aeb9c2;
  --color-neutral-600: #526778;
  --color-neutral-650: #425466;
  --color-neutral-700: #2b3e50;
  --color-neutral-725: #2b3c49;
  --color-neutral-750: #263d50;
  --color-neutral-900: #101214;

  /* Product swatch primitives */
  --color-device-sand: #c4b7aa;
  --color-device-beige: #aa927c;
  --color-device-taupe: #a18f7d;
  --color-device-stone: #70645b;
  --color-device-brown: #654a39;
  --color-device-rose: #c18f73;
  --color-device-charcoal: #353535;
  --color-device-graphite: #4d5053;
  --color-device-black: #101214;
  --color-device-silver: #c9ccca;
  --color-device-product-sand: #c8b8a7;
  --color-device-product-taupe: #867466;
  --color-device-product-brown: #6d4f3d;
  --color-device-product-black: #202224;
  --color-device-product-silver: #b8b8b3;
  --color-filter-border: #55adf1;
  --color-product-card-border-hover: #8bc9f5;

  /* Semantic colors */
  --color-primary: var(--color-blue-600);
  --color-primary-hover: var(--color-blue-650);
  --color-primary-active: var(--color-blue-900);
  --color-accent: var(--color-gold-500);
  --color-focus: var(--color-orange-700);
  --color-background: var(--color-neutral-0);
  --color-background-alt: var(--color-neutral-100);
  --color-surface: var(--color-neutral-100);
  --color-surface-muted: var(--color-neutral-200);
  --color-surface-raised: var(--color-neutral-0);
  --color-surface-subtle: var(--color-neutral-125);
  --color-text-primary: var(--color-blue-850);
  --color-text-heading: var(--color-blue-800);
  --color-text-secondary: var(--color-neutral-725);
  --color-text-muted: var(--color-neutral-600);
  --color-text-inverse: var(--color-neutral-0);
  --color-border: var(--color-neutral-350);
  --color-border-muted: var(--color-neutral-250);
  --color-link: var(--color-primary);
  --color-link-hover: var(--color-primary-hover);

  /* Backward-compatible aliases used by existing templates */
  --color-navy: var(--color-blue-850);
  --color-navy-deep: var(--color-blue-900);
  --color-deep-blue: var(--color-blue-700);
  --color-cyan: var(--color-cyan-500);
  --color-white: var(--color-neutral-0);
  --color-text: var(--color-text-primary);

  /* Typography */
  --font-primary: Arial, Helvetica, "Segoe UI", sans-serif;
  --font-persian: Tahoma, Arial, sans-serif;
  --font-mono: Consolas, "Courier New", monospace;
  --font-family-base: var(--font-primary);
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: clamp(1.75rem, 2.5vw, 2.25rem);
  --font-size-section: clamp(2rem, 3.4vw, 3rem);
  --font-size-hero: clamp(2.5rem, 5vw, 4.25rem);
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-tight: 1.08;
  --line-height-heading: 1.18;
  --line-height-base: 1.6;
  --line-height-relaxed: 1.8;
  --tracking-normal: 0;
  --tracking-tight: -0.02em;
  --tracking-wide: 0.045em;
  --measure-content: 48rem;
  --measure-wide: 64rem;

  /* Spacing */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 2.5rem;
  --space-8: 3rem;
  --space-9: 4rem;
  --space-10: 5rem;
  --space-11: 6rem;
  --space-12: 7.5rem;

  /* Layout */
  --container-main: 1312px;
  --container-wide: 1536px;
  --container-content: 72rem;
  --container-reading: 47.5rem;
  --container-gutter: 1.5rem;
  --section-space: clamp(5rem, 8vw, 8rem);
  --section-space-small: clamp(3rem, 6vw, 5rem);
  --button-height: 3.25rem;
  --utility-height: 5rem;
  --nav-height: 4.5rem;
  --site-header-height: calc(var(--utility-height) + var(--nav-height));

  /* Radius */
  --radius-none: 0;
  --radius-sm: 0.25rem;
  --radius-md: 0.75rem;
  --radius-pill: 999px;
  --radius-circle: 50%;
  --radius-button: var(--radius-pill);

  /* Shadows */
  --shadow-dropdown: 0 0.75rem 2rem rgb(3 45 90 / 0.16);
  --shadow-modal: 0 1.5rem 4rem rgb(3 45 90 / 0.25);

  /* Motion */
  --duration-instant: 100ms;
  --duration-fast: 180ms;
  --duration-normal: 220ms;
  --ease-standard: ease;
  --transition-base: var(--duration-fast) var(--ease-standard);
  --transition-color:
    color var(--transition-base),
    background-color var(--transition-base),
    border-color var(--transition-base);
  --transition-transform: transform var(--transition-base);
  --transition-opacity: opacity var(--transition-base);

  /* Z-index */
  --z-base: 0;
  --z-header: 20;
  --z-menu: 30;
  --z-filter-backdrop: 70;
  --z-filter-drawer: 80;
  --z-modal: 100;

  /* Focus */
  --focus-ring-color: var(--color-focus);
  --focus-ring-width: 3px;
  --focus-ring-offset: 4px;

  /* Component tokens */
  --button-primary-background: var(--color-primary);
  --button-primary-background-hover: var(--color-primary-hover);
  --button-primary-text: var(--color-text-inverse);
  --card-background: var(--color-surface-raised);
  --card-border-color: var(--color-border-muted);
  --header-background: var(--color-background);
  --footer-background: var(--color-navy-deep);
}

/* Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: light;
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-wrap: anywhere;
  color: var(--color-text-primary);
  background: var(--color-background);
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
}

body.is-locked {
  overflow: hidden;
}

html:lang(fa),
html:lang(ar) {
  font-family: var(--font-persian);
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

button,
input,
select,
textarea {
  color: inherit;
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

a {
  color: inherit;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

ul {
  list-style: none;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

h1,
h2,
h3,
h4 {
  margin-bottom: var(--space-5);
  color: inherit;
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-heading);
}

h1 {
  font-size: var(--font-size-hero);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
}

h2 {
  font-size: var(--font-size-section);
}

h3 {
  font-size: var(--font-size-xl);
}

p {
  margin-bottom: var(--space-5);
}

::selection {
  color: var(--color-text-inverse);
  background: var(--color-primary);
}

:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

.visually-hidden,
.u-visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  inset-block-start: var(--space-3);
  inset-inline-start: var(--space-3);
  z-index: calc(var(--z-modal) + 1);
  padding: var(--space-3) var(--space-4);
  color: var(--color-navy);
  background: var(--color-white);
  border-radius: var(--radius-sm);
  transform: translateY(-180%);
  transition: transform var(--transition-base);
}

.skip-link:focus {
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}