/**
 * Event Registration System - Design Tokens
 * 
 * Central design system defining all design tokens used across components.
 * This file should be loaded first before any component styles.
 * 
 * @package Event_Registration_System
 */

:root {
    /* ================================
     * COLOR SYSTEM
     * =============================== */
    
    /* Brand Colors */
    --ers-color-primary: #F26522;
    --ers-color-primary-hover: #ff8c42;
    --ers-color-primary-light: rgba(242, 101, 34, 0.1);
    --ers-color-primary-border: rgba(242, 101, 34, 0.2);
    
    /* Background Colors */
    --ers-color-bg-body: #111111;
    --ers-color-bg-surface: rgba(0, 0, 0, 0.2);
    --ers-color-bg-surface-elevated: rgba(0, 0, 0, 0.3);
    --ers-color-bg-overlay: rgba(0, 0, 0, 0.8);
    
    /* Text Colors */
    --ers-color-text-primary: #ffffff;
    --ers-color-text-secondary: rgba(255, 255, 255, 0.4);
    --ers-color-text-muted: #b0b0b0;
    --ers-color-text-placeholder: rgba(176, 176, 176, 0.7);
    
    /* Status Colors */
    --ers-color-success: #22c55e;
    --ers-color-success-bg: rgba(34, 197, 94, 0.1);
    --ers-color-success-border: #22c55e;
    
    --ers-color-error: #ef4444;
    --ers-color-error-bg: rgba(239, 68, 68, 0.1);
    --ers-color-error-border: rgba(239, 68, 68, 0.3);
    
    --ers-color-warning: #ffa100;
    --ers-color-warning-bg: rgba(255, 161, 0, 0.1);
    --ers-color-warning-border: rgba(255, 161, 0, 0.3);
    
    /* Border Colors */
    --ers-color-border-default: rgba(255, 255, 255, 0.4);
    --ers-color-border-subtle: rgba(255, 255, 255, 0.1);
    --ers-color-border-focus: var(--ers-color-primary);
    
    /* ================================
     * TYPOGRAPHY SYSTEM
     * =============================== */
    
    /* Font Families */
    --ers-font-family-heading: 'Anton', sans-serif;
    --ers-font-family-body: -apple-system, "system-ui", Segoe UI, roboto, helvetica, arial, sans-serif;
    --ers-font-family-mono: monospace;
    
    /* Font Weights */
    --ers-font-weight-normal: 400;
    --ers-font-weight-medium: 500;
    --ers-font-weight-semibold: 600;
    --ers-font-weight-bold: 700;
    
    /* Font Sizes */
    --ers-font-size-xs: 0.75rem;      /* 12px */
    --ers-font-size-sm: 0.875rem;     /* 14px */
    --ers-font-size-base: 1rem;       /* 16px */
    --ers-font-size-lg: 1.125rem;     /* 18px */
    --ers-font-size-xl: 1.25rem;      /* 20px */
    --ers-font-size-2xl: 1.5rem;      /* 24px */
    --ers-font-size-3xl: 1.875rem;    /* 30px */
    --ers-font-size-4xl: 2rem;        /* 32px */
    
    /* Line Heights */
    --ers-line-height-tight: 1.2;
    --ers-line-height-snug: 1.4;
    --ers-line-height-normal: 1.5;
    --ers-line-height-relaxed: 1.6;
    --ers-line-height-loose: 1.7;
    
    /* Letter Spacing */
    --ers-letter-spacing-tighter: -0.05em;
    --ers-letter-spacing-tight: -0.025em;
    --ers-letter-spacing-normal: 0em;
    --ers-letter-spacing-wide: 0.025em;
    --ers-letter-spacing-wider: 0.05em;
    --ers-letter-spacing-widest: 0.1em;
    --ers-letter-spacing-anton: 0.1em; /* Specific spacing for Anton font readability */
    
    /* ================================
     * SPACING SYSTEM
     * =============================== */
    
    --ers-space-0: 0;
    --ers-space-1: 0.25rem;   /* 4px */
    --ers-space-2: 0.5rem;    /* 8px */
    --ers-space-3: 0.75rem;   /* 12px */
    --ers-space-4: 1rem;      /* 16px */
    --ers-space-5: 1.25rem;   /* 20px */
    --ers-space-6: 1.5rem;    /* 24px */
    --ers-space-8: 2rem;      /* 32px */
    --ers-space-10: 2.5rem;   /* 40px */
    --ers-space-12: 3rem;     /* 48px */
    --ers-space-16: 4rem;     /* 64px */
    --ers-space-20: 5rem;     /* 80px */
    --ers-space-24: 6rem;     /* 96px */
    
    /* ================================
     * SIZING SYSTEM
     * =============================== */
    
    /* Border Radius */
    --ers-radius-none: 0;
    --ers-radius-sm: 0.25rem;    /* 4px */
    --ers-radius-default: 0.5rem; /* 8px */
    --ers-radius-lg: 0.75rem;    /* 12px */
    --ers-radius-xl: 1rem;       /* 16px */
    --ers-radius-2xl: 1.5rem;    /* 24px */
    --ers-radius-full: 9999px;
    
    /* Border Widths */
    --ers-border-width-0: 0;
    --ers-border-width-1: 1px;
    --ers-border-width-2: 2px;
    --ers-border-width-4: 4px;
    
    /* Box Shadows */
    --ers-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --ers-shadow-default: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --ers-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --ers-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --ers-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --ers-shadow-focus: 0 0 0 3px rgba(242, 101, 34, 0.1);
    --ers-shadow-glow: 0 4px 15px rgba(242, 101, 34, 0.3);
    
    /* ================================
     * ANIMATION & TRANSITIONS
     * =============================== */
    
    /* Durations */
    --ers-duration-fast: 0.1s;
    --ers-duration-default: 0.2s;
    --ers-duration-slow: 0.3s;
    --ers-duration-slower: 0.5s;
    
    /* Timing Functions */
    --ers-ease-linear: linear;
    --ers-ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ers-ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ers-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Common Transitions */
    --ers-transition-colors: color var(--ers-duration-default) var(--ers-ease-in-out),
                            background-color var(--ers-duration-default) var(--ers-ease-in-out),
                            border-color var(--ers-duration-default) var(--ers-ease-in-out);
    
    --ers-transition-transform: transform var(--ers-duration-default) var(--ers-ease-in-out);
    
    --ers-transition-all: all var(--ers-duration-default) var(--ers-ease-in-out);
    
    /* ================================
     * COMPONENT TOKENS
     * =============================== */
    
    /* Form Controls */
    --ers-input-height: 40px;
    --ers-input-padding: var(--ers-space-2) var(--ers-space-3);
    --ers-input-font-size: var(--ers-font-size-base);
    --ers-input-line-height: var(--ers-line-height-normal);
    --ers-input-border-width: var(--ers-border-width-2);
    --ers-input-border-radius: var(--ers-radius-default);
    
    /* Buttons */
    --ers-button-height: 44px; /* Minimum touch target */
    --ers-button-padding: var(--ers-space-4) var(--ers-space-8);
    --ers-button-font-size: var(--ers-font-size-base);
    --ers-button-font-weight: var(--ers-font-weight-normal);
    --ers-button-border-radius: var(--ers-radius-default);
    --ers-button-border-width: var(--ers-border-width-0);
    
    /* Cards/Sections */
    --ers-card-padding: var(--ers-space-6);
    --ers-card-border-radius: var(--ers-radius-xl);
    --ers-card-border-width: var(--ers-border-width-1);
    
    /* Modals */
    --ers-modal-max-width: 800px;
    --ers-modal-padding: var(--ers-space-8);
    --ers-modal-border-radius: var(--ers-radius-xl);
    --ers-modal-backdrop: var(--ers-color-bg-overlay);
    
    /* Z-Index Scale */
    --ers-z-dropdown: 10;
    --ers-z-modal: 1000;
    --ers-z-overlay: 10000;
    --ers-z-tooltip: 10001;
    
    /* ================================
     * RESPONSIVE BREAKPOINTS
     * =============================== */
    
    --ers-breakpoint-sm: 480px;
    --ers-breakpoint-md: 768px;
    --ers-breakpoint-lg: 1024px;
    --ers-breakpoint-xl: 1280px;
}

/* ================================
 * TYPOGRAPHY UTILITIES
 * =============================== */

.ers-text-xs { font-size: var(--ers-font-size-xs); }
.ers-text-sm { font-size: var(--ers-font-size-sm); }
.ers-text-base { font-size: var(--ers-font-size-base); }
.ers-text-lg { font-size: var(--ers-font-size-lg); }
.ers-text-xl { font-size: var(--ers-font-size-xl); }
.ers-text-2xl { font-size: var(--ers-font-size-2xl); }
.ers-text-3xl { font-size: var(--ers-font-size-3xl); }
.ers-text-4xl { font-size: var(--ers-font-size-4xl); }

.ers-font-heading {
    font-family: var(--ers-font-family-heading);
    font-weight: 400 !important; /* Force Anton to 400 weight */
    text-transform: uppercase;
    letter-spacing: var(--ers-letter-spacing-anton) !important; /* Better readability for Anton font */
}

.ers-font-body {
    font-family: var(--ers-font-family-body);
    font-weight: var(--ers-font-weight-normal);
}

.ers-font-medium { font-weight: var(--ers-font-weight-medium); }
.ers-font-semibold { font-weight: var(--ers-font-weight-semibold); }
.ers-font-bold { font-weight: var(--ers-font-weight-bold); }

/* ================================
 * COLOR UTILITIES
 * =============================== */

.ers-text-primary { color: var(--ers-color-text-primary); }
.ers-text-secondary { color: var(--ers-color-text-secondary); }
.ers-text-muted { color: var(--ers-color-text-muted); }
.ers-text-brand { color: var(--ers-color-primary); }
.ers-text-success { color: var(--ers-color-success); }
.ers-text-error { color: var(--ers-color-error); }
.ers-text-warning { color: var(--ers-color-warning); }

/* ================================
 * SPACING UTILITIES
 * =============================== */

.ers-space-y-0 > * + * { margin-top: var(--ers-space-0); }
.ers-space-y-1 > * + * { margin-top: var(--ers-space-1); }
.ers-space-y-2 > * + * { margin-top: var(--ers-space-2); }
.ers-space-y-3 > * + * { margin-top: var(--ers-space-3); }
.ers-space-y-4 > * + * { margin-top: var(--ers-space-4); }
.ers-space-y-6 > * + * { margin-top: var(--ers-space-6); }
.ers-space-y-8 > * + * { margin-top: var(--ers-space-8); }

/* ================================
 * ANIMATION KEYFRAMES
 * =============================== */

@keyframes ers-fade-in-up {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes ers-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes ers-pulse {
    0% {
        transform: scale(0.95);
        opacity: 0.8;
    }
    50% {
        transform: scale(1.02);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes ers-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes ers-bounce {
    0%, 80%, 100% {
        transform: scale(0);
    }
    40% {
        transform: scale(1);
    }
}

/* ================================
 * ACCESSIBILITY UTILITIES
 * =============================== */

.ers-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;
}

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

/* ================================
 * LEGACY COMPATIBILITY
 * =============================== */

/* Provide backward compatibility with existing variable names */
:root {
    --primary: var(--ers-color-primary);
    --secondary: var(--ers-color-text-primary);
    --secondary-40: var(--ers-color-text-secondary);
    --bg-body: var(--ers-color-bg-body);
    --text-l: var(--ers-font-size-xl);
}