/**
 * Theme System - Black & White iPhone Glassy Animated
 * Glassmorphism design with smooth animations
 */

/* ============================================
   CSS CUSTOM PROPERTIES (THEME VARIABLES)
   ============================================ */

:root {
    /* ===== COLOR PALETTE - BLACK & WHITE ===== */
    
    /* Primary Colors */
    --color-white: #ffffff;
    --color-black: #000000;
    
    /* Grays (monochrome scale) */
    --color-gray-50: #fafafa;
    --color-gray-100: #f5f5f5;
    --color-gray-200: #e5e5e5;
    --color-gray-300: #d4d4d4;
    --color-gray-400: #a3a3a3;
    --color-gray-500: #737373;
    --color-gray-600: #525252;
    --color-gray-700: #404040;
    --color-gray-800: #262626;
    --color-gray-900: #171717;
    
    /* Accent Color (Black for monochrome theme) */
    --color-accent: #7c3aed;
    --color-accent-hover: #6d28d9;
    --color-accent-light: rgba(124, 58, 237, 0.1);
    --color-accent-dark: #5b21b6;
    
    /* Semantic Colors (monochrome variants) */
    --color-success: #404040;
    --color-success-light: rgba(0, 0, 0, 0.05);
    --color-danger: #1a1a1a;
    --color-danger-light: rgba(0, 0, 0, 0.08);
    --color-warning: #525252;
    --color-warning-light: rgba(0, 0, 0, 0.06);
    --color-info: #262626;
    --color-info-light: rgba(0, 0, 0, 0.05);
    
    /* ===== THEME MAPPING (Light Glassy Mode) ===== */
    
    /* Backgrounds - Glassy white with blur */
    --bg-primary: rgba(255, 255, 255, 0.7);
    --bg-secondary: rgba(250, 250, 250, 0.5);
    --bg-tertiary: rgba(245, 245, 245, 0.6);
    --bg-hover: rgba(255, 255, 255, 0.9);
    --bg-sidebar: rgba(255, 255, 255, 0.75);
    --bg-sidebar-hover: rgba(0, 0, 0, 0.05);
    --bg-sidebar-active: rgba(0, 0, 0, 0.1);
    
    /* Text */
    --text-primary: #000000;
    --text-secondary: #404040;
    --text-tertiary: #737373;
    --text-muted: #a3a3a3;
    
    /* Borders - Subtle glass borders */
    --border-color: rgba(0, 0, 0, 0.1);
    --border-hover: rgba(0, 0, 0, 0.2);
    --border-light: rgba(0, 0, 0, 0.05);
    
    /* Shadows - Soft glass shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 36px rgba(0, 0, 0, 0.15);
    
    /* ===== TYPOGRAPHY ===== */
    
    /* Font Family */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'SF Mono', 'Monaco', 'Courier New', monospace;
    
    /* Font Sizes */
    --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 Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Line Heights */
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* ===== SPACING SYSTEM (8px base unit) ===== */
    
    --spacing-0: 0;
    --spacing-1: 0.25rem;   /* 4px */
    --spacing-2: 0.5rem;    /* 8px */
    --spacing-3: 0.75rem;   /* 12px */
    --spacing-4: 1rem;      /* 16px */
    --spacing-5: 1.25rem;   /* 20px */
    --spacing-6: 1.5rem;    /* 24px */
    --spacing-8: 2rem;      /* 32px */
    --spacing-10: 2.5rem;   /* 40px */
    --spacing-12: 3rem;     /* 48px */
    --spacing-16: 4rem;     /* 64px */
    
    /* ===== BORDER RADIUS ===== */
    
    --radius-sm: 0.375rem;   /* 6px */
    --radius-md: 0.5rem;     /* 8px */
    --radius-lg: 0.75rem;    /* 12px */
    --radius-xl: 1rem;       /* 16px */
    --radius-full: 9999px;
    
    /* ===== TRANSITIONS ===== */
    
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* ===== Z-INDEX SCALE ===== */
    
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ===== DARK MODE OVERRIDES - GLASSY BLACK ===== */

body.dark-mode {
    /* Backgrounds - Glassy black with blur */
    --bg-primary: rgba(0, 0, 0, 0.7);
    --bg-secondary: rgba(23, 23, 23, 0.5);
    --bg-tertiary: rgba(38, 38, 38, 0.6);
    --bg-hover: rgba(255, 255, 255, 0.1);
    --bg-sidebar: rgba(0, 0, 0, 0.75);
    --bg-sidebar-hover: rgba(255, 255, 255, 0.1);
    --bg-sidebar-active: rgba(255, 255, 255, 0.15);
    
    /* Text */
    --text-primary: #ffffff;
    --text-secondary: #d4d4d4;
    --text-tertiary: #a3a3a3;
    --text-muted: #737373;
    
    /* Borders - Subtle glass borders */
    --border-color: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);
    --border-light: rgba(255, 255, 255, 0.05);
    
    /* Shadows (glassy dark) */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.7);
    --shadow-xl: 0 12px 36px rgba(0, 0, 0, 0.8);
}

/* ============================================
   BASE TYPOGRAPHY & RESET
   ============================================ */

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

/* Base reset and body styles are in style.css to avoid duplication */

/* ============================================
   ACCESSIBILITY ENHANCEMENTS
   ============================================ */

/* Focus styles for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Skip to content link for screen readers */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-accent);
    color: var(--color-white);
    padding: var(--spacing-2) var(--spacing-4);
    text-decoration: none;
    z-index: var(--z-tooltip);
}

.skip-link:focus {
    top: 0;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Text utilities */
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-muted { color: var(--text-muted); }
.text-accent { color: var(--color-accent); }

/* Background utilities */
.bg-primary { background-color: var(--bg-primary); }
.bg-secondary { background-color: var(--bg-secondary); }
.bg-tertiary { background-color: var(--bg-tertiary); }

/* Spacing utilities */
.mt-0 { margin-top: var(--spacing-0); }
.mt-2 { margin-top: var(--spacing-2); }
.mt-4 { margin-top: var(--spacing-4); }
.mt-6 { margin-top: var(--spacing-6); }
.mb-0 { margin-bottom: var(--spacing-0); }
.mb-2 { margin-bottom: var(--spacing-2); }
.mb-4 { margin-bottom: var(--spacing-4); }
.mb-6 { margin-bottom: var(--spacing-6); }
.p-4 { padding: var(--spacing-4); }
.p-6 { padding: var(--spacing-6); }
.p-8 { padding: var(--spacing-8); }

/* Border utilities */
.border { border: 1px solid var(--border-color); }
.border-light { border: 1px solid var(--border-light); }
.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }

/* Shadow utilities */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }