/* ========================================
   DANCE STUDIO — Design System Variables
   ======================================== */

:root {
  /* === Primary Palette === */
  --color-primary: #6B46C1;
  --color-primary-light: #805AD5;
  --color-primary-dark: #553C9A;
  --color-primary-rgb: 107, 70, 193;

  --color-accent: #FF6B6B;
  --color-accent-light: #FF8E8E;
  --color-accent-dark: #E84545;
  --color-accent-rgb: 255, 107, 107;

  --color-midnight: #1A202C;
  --color-midnight-rgb: 26, 32, 44;

  /* === Secondary Palette === */
  --color-rose-gold: #B76E79;
  --color-rose-gold-rgb: 183, 110, 121;
  --color-cream: #FFF5F5;
  --color-charcoal: #2D3748;
  --color-charcoal-rgb: 45, 55, 72;

  /* === Gradient Presets === */
  --gradient-primary: linear-gradient(135deg, #6B46C1 0%, #FF6B6B 100%);
  --gradient-primary-reverse: linear-gradient(135deg, #FF6B6B 0%, #6B46C1 100%);
  --gradient-hero: linear-gradient(135deg, rgba(107,70,193,0.9) 0%, rgba(255,107,107,0.7) 100%);
  --gradient-dark: linear-gradient(135deg, #1A202C 0%, #2D3748 100%);
  --gradient-card: linear-gradient(145deg, rgba(107,70,193,0.05) 0%, rgba(255,107,107,0.05) 100%);
  --gradient-glow: radial-gradient(circle, rgba(107,70,193,0.3) 0%, transparent 70%);

  /* === Light Mode (Default) === */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F7FAFC;
  --bg-tertiary: #EDF2F7;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F7FAFC;
  --bg-nav: rgba(255, 255, 255, 0.85);
  --bg-nav-scrolled: rgba(255, 255, 255, 0.95);
  --bg-footer: #1A202C;
  --bg-input: #FFFFFF;
  --bg-overlay: rgba(26, 32, 44, 0.6);

  --text-primary: #1A202C;
  --text-secondary: #4A5568;
  --text-tertiary: #718096;
  --text-inverse: #F7FAFC;
  --text-on-primary: #FFFFFF;
  --text-link: #6B46C1;
  --text-link-hover: #805AD5;

  --border-color: #E2E8F0;
  --border-color-hover: #CBD5E0;
  --border-color-focus: #6B46C1;

  --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0,0,0,0.25);
  --shadow-glow: 0 0 30px rgba(107, 70, 193, 0.3);
  --shadow-glow-accent: 0 0 30px rgba(255, 107, 107, 0.3);

  /* === Typography === */
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-accent: 'Dancing Script', cursive;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  --font-size-6xl: 3.75rem;   /* 60px */
  --font-size-7xl: 4.5rem;    /* 72px */

  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --font-weight-black: 900;

  --line-height-tight: 1.15;
  --line-height-snug: 1.3;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.8;

  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.05em;
  --letter-spacing-wider: 0.1em;
  --letter-spacing-widest: 0.2em;

  /* === Spacing (8px grid) === */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  --space-32: 8rem;     /* 128px */

  /* === Border Radius === */
  --radius-sm: 0.5rem;    /* 8px */
  --radius-md: 1rem;      /* 16px */
  --radius-lg: 1.5rem;    /* 24px */
  --radius-xl: 2rem;      /* 32px */
  --radius-full: 9999px;
  --radius-circle: 50%;

  /* === Transitions === */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-bounce: 600ms cubic-bezier(0.68, -0.55, 0.27, 1.55);

  /* === Z-Index Scale === */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
  --z-preloader: 1000;
  --z-cursor: 9999;

  /* === Container === */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1440px;

  /* === Glass Effect === */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.15);
  --glass-blur: 20px;
  --navbar-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
}

/* ========================================
   DARK MODE THEME
   ======================================== */
[data-theme="dark"] {
  --bg-primary: #0F0F0F;
  --bg-secondary: #1A1A2E;
  --bg-tertiary: #16213E;
  --bg-card: #1A1A2E;
  --bg-card-hover: #222244;
  --bg-nav: rgba(15, 15, 15, 0.8);
  --bg-nav-scrolled: rgba(15, 15, 15, 0.95);
  --bg-footer: #0A0A0A;
  --bg-input: #1A1A2E;
  --bg-overlay: rgba(0, 0, 0, 0.7);

  --text-primary: #F7FAFC;
  --text-secondary: #CBD5E0;
  --text-tertiary: #A0AEC0;
  --text-inverse: #1A202C;
  --text-link: #B794F4;
  --text-link-hover: #D6BCFA;

  --border-color: rgba(255, 255, 255, 0.1);
  --border-color-hover: rgba(255, 255, 255, 0.2);
  --border-color-focus: #B794F4;

  --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -1px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5), 0 4px 6px -2px rgba(0,0,0,0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.5), 0 10px 10px -5px rgba(0,0,0,0.3);
  --shadow-2xl: 0 25px 50px -12px rgba(0,0,0,0.6);
  --shadow-glow: 0 0 40px rgba(107, 70, 193, 0.4);
  --shadow-glow-accent: 0 0 40px rgba(255, 107, 107, 0.4);

  --gradient-card: linear-gradient(145deg, rgba(107,70,193,0.1) 0%, rgba(255,107,107,0.1) 100%);

  --glass-bg: rgba(26, 26, 46, 0.2);
  --glass-border: rgba(255, 255, 255, 0.05);
  --navbar-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

/* ========================================
   RTL TYPOGRAPHY
   ======================================== */
[dir="rtl"] {
  --font-heading: 'Cairo', 'Playfair Display', serif;
  --font-body: 'Cairo', 'Inter', sans-serif;
  --line-height-normal: 1.8;
}

/* ========================================
   BASE RESETS & GLOBAL STYLES
   ======================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color 0.4s ease, color 0.4s ease;
}

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

a {
  color: var(--text-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--text-link-hover);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: var(--line-height-tight);
  color: var(--text-primary);
  font-weight: var(--font-weight-bold);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl);  }
h6 { font-size: var(--font-size-lg);  }

p {
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

::selection {
  background-color: rgba(var(--color-primary-rgb), 0.3);
  color: var(--text-primary);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* === Scrollbar === */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-light);
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.container--sm { max-width: var(--container-sm); }
.container--md { max-width: var(--container-md); }
.container--lg { max-width: var(--container-lg); }
.container--2xl { max-width: var(--container-2xl); }

.section {
  padding-block: var(--space-24);
  position: relative;
}

.section--sm { padding-block: var(--space-16); }

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-accent {
  font-family: var(--font-accent);
}

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

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