/* 
   MJ Tech Hub - Theme CSS
   Dark mode default, light mode toggle.
*/

:root {
    /* Dark Theme (Default) */
    --bg-primary: #0F172A; /* Premium slate dark */
    --bg-secondary: #1E293B; /* Elevated slate */
    --bg-tertiary: #334155;
    
    --text-primary: #F8FAFC;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    
    /* Brand Colors */
    --brand-primary: #3B82F6; 
    --brand-primary-hover: #2563EB;
    --brand-secondary: #06B6D4;
    --brand-accent: #8B5CF6; /* Purple accent */
    --brand-subtle: rgba(59, 130, 246, 0.15);
    
    /* Category Colors */
    --cat-networking: #3B82F6; /* Blue */
    --cat-windows: #0EA5E9; /* Light Blue */
    --cat-linux: #EAB308; /* Yellow */
    --cat-servers: #8B5CF6; /* Purple */
    --cat-cybersecurity: #EF4444; /* Red */
    --cat-cloud: #10B981; /* Green */

    --border-color: #334155;
    --border-subtle: rgba(255, 255, 255, 0.1);
    
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --hover-shadow: 0 10px 20px -3px rgba(0, 0, 0, 0.5);
    
    /* Code block colors */
    --code-bg: #020617; /* Very dark slate for contrast */
    --code-text: #E2E8F0;
    
    /* Functional */
    --success: #10B981;
    --danger: #EF4444;
    --warning: #F59E0B;
    
    /* Radii */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Layout */
    --container-width: 1200px;
    --article-width: 800px;
    --header-height: 72px;
}

[data-theme="light"] {
    /* Light Mode */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8FAFC;
    --bg-tertiary: #F1F5F9;
    
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #64748B;
    
    --brand-primary: #2563EB;
    --brand-primary-hover: #1D4ED8;
    --brand-secondary: #0891B2;
    --brand-accent: #6D28D9;
    --brand-subtle: rgba(37, 99, 235, 0.1);
    
    --border-color: #E2E8F0;
    --border-subtle: rgba(0, 0, 0, 0.05);
    
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --hover-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    --code-bg: #F1F5F9;
    --code-text: #0F172A;
}

/* Base Body Styles */
body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    margin: 0;
    padding: 0;
}

body.theme-transition {
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Phase 4: Dark Mode Visual Refinements */
[data-theme="dark"] .site-logo {
    filter: invert(1) hue-rotate(180deg) brightness(1.5);
}

[data-theme="dark"] .laptop-composite {
    border-radius: 12px;
    box-shadow: 0 0 40px rgba(59, 130, 246, 0.12); /* Subtle restrained blue glow */
    background-color: rgba(15, 23, 42, 0.4);
}

[data-theme="dark"] .search-box input::placeholder,
[data-theme="dark"] .search-modal-input::placeholder {
    color: #94A3B8; /* High contrast placeholder in dark mode */
    opacity: 1;
}

/* Phase 4: Light Mode Visual Refinements */
[data-theme="light"] .laptop-composite {
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    background-color: rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .search-box input {
    border-color: #CBD5E1; /* Slate 300 for slightly better contrast than default E2E8F0 */
}

[data-theme="light"] .search-box input::placeholder,
[data-theme="light"] .search-modal-input::placeholder {
    color: #64748B; /* Slate 500 */
    opacity: 1;
}