/* =============================================================================
   Project Name: YIAL Arabic Online
   File Purpose: Core Design System Tokens & Global Base Styles
   ============================================================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Kufi+Arabic:wght@400;500;600;700&display=swap');

:root {
  /* Brand Colors */
  --color-primary-950: #06111f;
  --color-primary-900: #0B1F3A; /* Midnight Navy */
  --color-primary-800: #102A4C;
  --color-primary-700: #15365C;
  
  --color-secondary-600: #C59A45; /* Heritage Gold/Sand */
  --color-secondary-500: #D2AA5C;
  --color-secondary-400: #D8B56A;
  
  --color-accent-700: #0F5E5D;
  --color-accent-600: #157A78; /* Teal/Emerald */
  --color-accent-500: #1B8079;
  --color-accent-400: #218C74;

  /* Neutrals */
  --color-bg-base: #FAF9F6;       /* Warm off-white background */
  --color-bg-surface: #FFFFFF;    /* Pure white */
  --color-bg-muted: #F3F1EC;      /* Soft warm gray */
  
  --color-text-main: #0B1F3A;     /* Charcoal/Dark Navy */
  --color-text-muted: #52637A;    /* Slate Gray */
  --color-text-inverse: #FFFFFF;  /* White text */
  
  --color-border-main: #E2DFD8;   /* Light gray border */
  --color-border-focus: #157A78;  /* Focus accent border */
  
  /* Semantic Statuses */
  --color-status-success-bg: #E6F4F2;
  --color-status-success-text: #157A78;
  --color-status-warning-bg: #FEF3C7;
  --color-status-warning-text: #B45309;
  --color-status-error-bg: #FEE2E2;
  --color-status-error-text: #B91C1C;
  --color-status-info-bg: #DBEAFE;
  --color-status-info-text: #1E40AF;

  /* Spacing Scale (8px Grid) */
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */

  /* Layout Containers */
  --container-wide: 1280px;
  --container-content: 960px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-soft: 0 2px 8px rgba(11, 31, 58, 0.04);
  --shadow-elevated: 0 8px 24px rgba(11, 31, 58, 0.08);

  /* Font Families */
  --font-en: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-ar: 'Noto Kufi Arabic', Tahoma, Arial, sans-serif;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;

  /* Typography Scale (Fluid using clamp) */
  --font-size-xs: clamp(0.75rem, 0.7rem + 0.2vw, 0.8rem);
  --font-size-sm: clamp(0.85rem, 0.8rem + 0.2vw, 0.9rem);
  --font-size-base: clamp(0.95rem, 0.9rem + 0.2vw, 1.05rem);
  --font-size-md: clamp(1.15rem, 1.1rem + 0.3vw, 1.35rem);
  --font-size-lg: clamp(1.45rem, 1.3rem + 0.6vw, 1.85rem);
  --font-size-xl: clamp(1.85rem, 1.7rem + 0.8vw, 2.5rem);
  --font-size-hero: clamp(2.3rem, 2rem + 1.5vw, 3.5rem);
}

/* =============================================================================
   Base Browser Resets & Normalizations
   ============================================================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  height: 100%;
}

body {
  font-family: var(--font-en);
  background-color: var(--color-bg-base);
  color: var(--color-text-main);
  line-height: 1.6;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

/* Bilingual Language Flow Support */
html[lang="ar"] body {
  font-family: var(--font-ar);
}

/* Accessible Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background-color: var(--color-accent-600);
  color: var(--color-text-inverse);
  padding: var(--space-3) var(--space-6);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  z-index: 9999;
  text-decoration: none;
  font-weight: 600;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: 0;
  outline: 2px solid var(--color-border-focus);
}

/* Accessible Focus States */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid var(--color-border-focus);
  outline-offset: 3px;
}

/* Keyboard Navigation Visual Focus Helper */
.js-focus-visible :focus:not(.focus-visible) {
  outline: none;
}

/* Image Aspect Ratios Rules */
img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* Typography Base Elements */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  color: var(--color-primary-900);
  line-height: 1.3;
}

html[lang="ar"] h1, html[lang="ar"] h2, html[lang="ar"] h3, html[lang="ar"] h4 {
  line-height: 1.45;
  letter-spacing: normal;
}

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

/* Accessibility Visually Hidden Helper */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Reduced Motion Settings */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* =============================================================================
   Button UI System
   ============================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-accent-600);
  color: var(--color-text-inverse);
}

.btn-primary:hover {
  background-color: var(--color-accent-700);
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--color-primary-900);
  color: var(--color-primary-900);
}

.btn-secondary:hover {
  background-color: var(--color-primary-900);
  color: var(--color-text-inverse);
}

.btn-text {
  background: none;
  border: none;
  color: var(--color-primary-900);
  padding: 0;
  font-weight: 600;
}

.btn-text:hover {
  color: var(--color-accent-600);
}

/* BiDi isolation utility for phone numbers and LTR tokens in RTL context */
.bidi-ltr {
  direction: ltr !important;
  unicode-bidi: isolate !important;
}