/* Global Styles and Design System */

:root {
    /* Colors */
    --color-primary: #3B82F6;
    --color-primary-dark: #2563EB;
    --color-primary-light: #60A5FA;
    
    --color-success: #10B981;
    --color-success-dark: #059669;
    --color-success-light: #34D399;
    
    --color-warning: #F59E0B;
    --color-warning-dark: #D97706;
    --color-warning-light: #FBBF24;
    
    --color-danger: #EF4444;
    --color-danger-dark: #DC2626;
    --color-danger-light: #F87171;
    
    --color-info: #8B5CF6;
    --color-info-dark: #7C3AED;
    --color-info-light: #A78BFA;
    
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;
    
    --color-white: #FFFFFF;
    --color-black: #000000;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --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);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;
    
    /* Layout */
    --max-width: 1400px;
    --navbar-height: 64px;
}

/* ========================================================================
   Theme Layer — semantic tokens. Components should prefer these over
   raw palette vars going forward.
   ======================================================================== */

:root,
:root[data-theme="light"] {
    --bg-app:        var(--color-gray-50);
    --bg-surface:    var(--color-white);
    --bg-surface-2:  var(--color-gray-50);
    --bg-surface-3:  var(--color-gray-100);
    --bg-overlay:    rgba(0, 0, 0, 0.5);

    --text-primary:   var(--color-gray-900);
    --text-secondary: var(--color-gray-600);
    --text-muted:     var(--color-gray-500);
    --text-inverted:  var(--color-white);

    --border-subtle: var(--color-gray-200);
    --border-strong: var(--color-gray-300);

    --code-bg:   var(--color-gray-900);
    --code-text: var(--color-gray-50);

    --chat-user-bg:        var(--color-primary-dark);
    --chat-user-text:      var(--color-white);
    --chat-assistant-bg:   var(--color-white);
    --chat-assistant-text: var(--color-gray-900);

    /* Legacy aliases — some component CSS still reads these names. */
    --color-bg-primary:     var(--bg-surface);
    --color-bg-secondary:   var(--bg-surface-2);
    --color-bg-tertiary:    var(--bg-surface-3);
    --color-text-primary:   var(--text-primary);
    --color-text-secondary: var(--text-secondary);
    --color-muted:          var(--text-muted);
    --color-border:         var(--border-subtle);
    --border-radius:        var(--radius-md);
    --border-radius-lg:     var(--radius-lg);

    --color-warning-50:  #FFFBEB;
    --color-warning-100: #FEF3C7;
    --color-warning-300: #FCD34D;
    --color-warning-600: #D97706;
    --color-warning-800: #92400E;
}

:root[data-theme="dark"] {
    /* Invert grayscale so existing var(--color-gray-*) consumers
       flip automatically without per-component edits. */
    --color-gray-50:  #111827;
    --color-gray-100: #1F2937;
    --color-gray-200: #374151;
    --color-gray-300: #4B5563;
    --color-gray-400: #6B7280;
    --color-gray-500: #9CA3AF;
    --color-gray-600: #D1D5DB;
    --color-gray-700: #E5E7EB;
    --color-gray-800: #F3F4F6;
    --color-gray-900: #F9FAFB;

    --color-white: #0B0F19;
    --color-black: #FFFFFF;

    --color-primary:       #60A5FA;
    --color-primary-dark:  #3B82F6;
    --color-primary-light: #93C5FD;

    --color-success:       #34D399;
    --color-success-dark:  #10B981;
    --color-success-light: #6EE7B7;

    --color-warning:       #FBBF24;
    --color-warning-dark:  #F59E0B;
    --color-warning-light: #FCD34D;

    --color-danger:        #F87171;
    --color-danger-dark:   #EF4444;
    --color-danger-light:  #FCA5A5;

    --color-info:          #A78BFA;
    --color-info-dark:     #8B5CF6;
    --color-info-light:    #C4B5FD;

    --bg-app:        #0B0F19;
    --bg-surface:    #111827;
    --bg-surface-2:  #1F2937;
    --bg-surface-3:  #374151;
    --bg-overlay:    rgba(0, 0, 0, 0.7);

    --text-primary:   #F9FAFB;
    --text-secondary: #D1D5DB;
    --text-muted:     #9CA3AF;
    --text-inverted:  #0B0F19;

    --border-subtle: #374151;
    --border-strong: #4B5563;

    --code-bg:   #0B0F19;
    --code-text: #E5E7EB;

    --chat-user-bg:        #2563EB;
    --chat-user-text:      #FFFFFF;
    --chat-assistant-bg:   #1F2937;
    --chat-assistant-text: #F3F4F6;

    /* Legacy aliases — dark theme */
    --color-bg-primary:     var(--bg-surface);
    --color-bg-secondary:   var(--bg-surface-2);
    --color-bg-tertiary:    var(--bg-surface-3);
    --color-text-primary:   var(--text-primary);
    --color-text-secondary: var(--text-secondary);
    --color-muted:          var(--text-muted);
    --color-border:         var(--border-subtle);
    --border-radius:        var(--radius-md);
    --border-radius-lg:     var(--radius-lg);

    /* Warning tints for dark theme — lower saturation backgrounds */
    --color-warning-50:  rgba(251, 191, 36, 0.1);
    --color-warning-100: rgba(251, 191, 36, 0.15);
    --color-warning-300: #B45309;
    --color-warning-600: #FBBF24;
    --color-warning-800: #FCD34D;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.35);
    --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, 0.45), 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);
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

/* Base Styles */
html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--color-gray-900);
    background-color: var(--color-gray-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-4);
}

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

p {
    margin-bottom: var(--spacing-4);
}

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

a:hover {
    color: var(--color-primary-dark);
}

/* Layout */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-8) var(--spacing-6);
    padding-top: calc(var(--navbar-height) + var(--spacing-8));
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-8);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-6);
}

/* Grid */
.grid {
    display: grid;
    gap: var(--spacing-6);
}

.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-gray-500); }
.text-sm { font-size: var(--font-size-sm); }
.text-xs { font-size: var(--font-size-xs); }

.mt-4 { margin-top: var(--spacing-4); }
.mb-4 { margin-bottom: var(--spacing-4); }
.ml-4 { margin-left: var(--spacing-4); }
.mr-4 { margin-right: var(--spacing-4); }

.hidden { display: none !important; }

/* Loading */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--color-gray-200);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Login Page Specific */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-info) 100%);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: var(--spacing-6);
}

.login-card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    box-shadow: var(--shadow-xl);
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-8);
}

.login-header h1 {
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-2);
}

.login-header p {
    color: var(--color-gray-500);
    font-size: var(--font-size-sm);
    margin-bottom: 0;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.login-footer {
    margin-top: var(--spacing-6);
    text-align: center;
}

.login-footer p {
    font-size: var(--font-size-xs);
    color: var(--color-gray-400);
    margin-bottom: 0;
}

/* Responsive */
@media (max-width: 1024px) {
    .container {
        padding: var(--spacing-6) var(--spacing-4);
        padding-top: calc(var(--navbar-height) + var(--spacing-6));
    }
    
    .grid-cols-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-4) var(--spacing-3);
        padding-top: calc(var(--navbar-height) + var(--spacing-4));
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-4);
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-4);
    }
    
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }
}