/* 
 * Gestalt Design System Variables for HVACJobsHQ
 * Import this file in your main styles.css to apply consistent design tokens
 */

:root {
    /* ==========================================
       SPACING SYSTEM (8-point grid)
       ========================================== */
    --space-xs: 0.25rem;   /* 4px - Micro spacing */
    --space-sm: 0.5rem;    /* 8px - Tight spacing */
    --space-md: 1rem;      /* 16px - Default spacing */
    --space-lg: 1.5rem;    /* 24px - Comfortable spacing */
    --space-xl: 2rem;      /* 32px - Section spacing */
    --space-2xl: 3rem;     /* 48px - Large spacing */
    --space-3xl: 4rem;     /* 64px - Extra large spacing */

    /* ==========================================
       COLOR SYSTEM
       ========================================== */
    /* Primary Palette */
    --color-primary: #3172ae;
    --color-primary-dark: #285f8f;
    --color-primary-light: #4d8bc4;
    --color-primary-rgb: 49, 114, 174;
    
    /* Neutral Palette */
    --color-text: #2c3e50;
    --color-text-secondary: #6c757d;
    --color-text-light: #909090;
    --color-bg: #ffffff;
    --color-bg-subtle: #f8f9fa;
    --color-border: #e9ecef;
    
    /* Semantic Colors */
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-danger: #dc3545;
    --color-info: #17a2b8;

    /* ==========================================
       TYPOGRAPHY SCALE (1.25 ratio)
       ========================================== */
    --font-xs: 0.8rem;      /* 12.8px */
    --font-sm: 0.875rem;    /* 14px */
    --font-base: 1rem;      /* 16px */
    --font-lg: 1.25rem;     /* 20px */
    --font-xl: 1.5rem;      /* 24px */
    --font-2xl: 1.875rem;   /* 30px */
    --font-3xl: 2.25rem;    /* 36px */
    
    /* Line Heights */
    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;
    
    /* Font Weights */
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;

    /* ==========================================
       ELEVATION SYSTEM (Figure-Ground)
       ========================================== */
    --elevation-0: none;
    --elevation-1: 0 1px 3px rgba(0,0,0,0.12);
    --elevation-2: 0 3px 6px rgba(0,0,0,0.16);
    --elevation-3: 0 10px 20px rgba(0,0,0,0.19);
    --elevation-4: 0 14px 28px rgba(0,0,0,0.25);

    /* ==========================================
       Z-INDEX SCALE (Figure-Ground)
       ========================================== */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-notification: 600;
    --z-tooltip: 700;

    /* ==========================================
       BORDER RADIUS (Consistency)
       ========================================== */
    --radius-sm: 0.25rem;   /* 4px */
    --radius-md: 0.5rem;    /* 8px */
    --radius-lg: 0.75rem;   /* 12px */
    --radius-xl: 1rem;      /* 16px */
    --radius-full: 9999px;  /* Pill shape */

    /* ==========================================
       TRANSITIONS (Common Fate)
       ========================================== */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* ==========================================
   UTILITY CLASSES (Apply Gestalt Principles)
   ========================================== */

/* Proximity - Group related elements */
.group-tight { gap: var(--space-sm); }
.group-default { gap: var(--space-md); }
.group-loose { gap: var(--space-lg); }

/* Figure-Ground - Elevation */
.elevated-low { box-shadow: var(--elevation-1); }
.elevated-medium { box-shadow: var(--elevation-2); }
.elevated-high { box-shadow: var(--elevation-3); }

/* Common Fate - Consistent interactions */
.interactive {
    cursor: pointer;
    transition: all var(--transition-base);
}

.interactive:hover {
    transform: translateY(-2px);
    box-shadow: var(--elevation-2);
}

.interactive:active {
    transform: translateY(0);
    box-shadow: var(--elevation-1);
}

/* ==========================================
   COMPONENT PATTERNS
   ========================================== */

/* Card Pattern (Multiple Gestalt Principles) */
.gestalt-card {
    /* Figure-Ground: Elevate from background */
    background: var(--color-bg);
    box-shadow: var(--elevation-1);
    
    /* Proximity: Internal spacing */
    padding: var(--space-lg);
    
    /* Continuity: Smooth corners guide eye */
    border-radius: var(--radius-md);
    
    /* Common Fate: Entire card responds */
    transition: all var(--transition-base);
}

.gestalt-card:hover {
    box-shadow: var(--elevation-2);
    transform: translateY(-2px);
}

/* Form Group Pattern (Proximity) */
.gestalt-form-group {
    margin-bottom: var(--space-lg);
}

.gestalt-form-group label {
    display: block;
    margin-bottom: var(--space-xs);
    font-weight: var(--font-medium);
    color: var(--color-text);
}

.gestalt-form-group input,
.gestalt-form-group select,
.gestalt-form-group textarea {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: var(--font-base);
    transition: all var(--transition-fast);
}

.gestalt-form-group input:focus,
.gestalt-form-group select:focus,
.gestalt-form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.1);
}

/* Button Pattern (Similarity & Figure-Ground) */
.gestalt-btn {
    /* Similarity: All buttons share base styles */
    display: inline-block;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-sm);
    font-weight: var(--font-medium);
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
}

.gestalt-btn-primary {
    /* Figure-Ground: Primary action prominent */
    background: var(--color-primary);
    color: white;
    box-shadow: var(--elevation-1);
}

.gestalt-btn-primary:hover {
    background: var(--color-primary-dark);
    box-shadow: var(--elevation-2);
    transform: translateY(-1px);
}

.gestalt-btn-secondary {
    /* Figure-Ground: Secondary recedes */
    background: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-border);
}

.gestalt-btn-secondary:hover {
    background: var(--color-bg-subtle);
    border-color: var(--color-primary);
}

/* Job Listing Pattern (All Principles Combined) */
.gestalt-job-card {
    /* Figure-Ground */
    background: var(--color-bg);
    box-shadow: var(--elevation-1);
    border-radius: var(--radius-md);
    
    /* Proximity */
    padding: var(--space-lg);
    
    /* Common Fate */
    transition: all var(--transition-base);
}

.gestalt-job-card:hover {
    box-shadow: var(--elevation-2);
    transform: translateY(-2px);
}

.gestalt-job-header {
    /* Proximity: Title and company close */
    margin-bottom: var(--space-md);
}

.gestalt-job-title {
    font-size: var(--font-lg);
    font-weight: var(--font-semibold);
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.gestalt-job-company {
    font-size: var(--font-base);
    color: var(--color-text-secondary);
}

.gestalt-job-meta {
    /* Similarity: All meta info styled same */
    display: flex;
    gap: var(--space-md);
    color: var(--color-text-secondary);
    font-size: var(--font-sm);
}

.gestalt-job-meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

/* Section Pattern (Proximity & Continuity) */
.gestalt-section {
    margin-bottom: var(--space-2xl);
}

.gestalt-section-header {
    /* Visual hierarchy guides eye */
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.gestalt-section-title {
    font-size: var(--font-2xl);
    font-weight: var(--font-bold);
    color: var(--color-text);
    line-height: var(--leading-tight);
}

.gestalt-section-subtitle {
    font-size: var(--font-base);
    color: var(--color-text-secondary);
    margin-top: var(--space-xs);
}

/* Grid Pattern (Symmetry & Balance) */
.gestalt-grid {
    display: grid;
    gap: var(--space-lg);
}

.gestalt-grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.gestalt-grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.gestalt-grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* Navigation Pattern (Continuity) */
.gestalt-nav {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.gestalt-nav-item {
    color: var(--color-text);
    text-decoration: none;
    font-weight: var(--font-medium);
    position: relative;
    transition: color var(--transition-fast);
}

.gestalt-nav-item::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.gestalt-nav-item:hover,
.gestalt-nav-item.active {
    color: var(--color-primary);
}

.gestalt-nav-item:hover::after,
.gestalt-nav-item.active::after {
    transform: scaleX(1);
}