/* Theme CSS - Global theme variables and styles for the app */

/* ===== Self-hosted Inter Font ===== */
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 100 900;
    font-display: swap;
    src: url('../fonts/Inter-Variable.woff2') format('woff2');
}

/* ===== Static tokens (don't change with theme) ===== */
:root {
    /* Primary palette (purple, based on #831CEF) */
    --palette-primary-50: #f5f0ff;
    --palette-primary-100: #ede0ff;
    --palette-primary-200: #d9bfff;
    --palette-primary-300: #c196ff;
    --palette-primary-400: #a55aff;
    --palette-primary-500: #831CEF;
    --palette-primary-600: #7017D4;
    --palette-primary-700: #5B12B0;
    --palette-primary-800: #480F8D;
    --palette-primary-900: #370B6B;

    /* Gray palette */
    --palette-gray-50: #f9fafb;
    --palette-gray-100: #f3f4f6;
    --palette-gray-200: #e5e7eb;
    --palette-gray-300: #d1d5db;
    --palette-gray-400: #9ca3af;
    --palette-gray-500: #6b7280;
    --palette-gray-600: #4b5563;
    --palette-gray-700: #374151;
    --palette-gray-800: #1f2937;
    --palette-gray-900: #111827;
    --palette-gray-950: #030712;

    /* Status colors */
    --palette-success: #22c55e;
    --palette-warning: #f59e0b;
    --palette-error: #ef4444;
    --palette-info: #06b6d4;

    /* Accent (teal — complementary to purple) */
    --palette-accent-500: #14b8a6;
    --palette-accent-600: #0d9488;

    /* Slate palette (cooler grays for dark mode) */
    --palette-slate-50: #f8fafc;
    --palette-slate-100: #f1f5f9;
    --palette-slate-200: #e2e8f0;
    --palette-slate-300: #cbd5e1;
    --palette-slate-400: #94a3b8;
    --palette-slate-500: #64748b;
    --palette-slate-600: #475569;
    --palette-slate-700: #334155;
    --palette-slate-800: #1e293b;
    --palette-slate-900: #0f172a;
    --palette-slate-950: #020617;

    /* Indigo palette (purple-tinted accent) */
    --palette-indigo-50: #eef2ff;
    --palette-indigo-100: #e0e7ff;
    --palette-indigo-200: #c7d2fe;
    --palette-indigo-300: #a5b4fc;
    --palette-indigo-400: #818cf8;
    --palette-indigo-500: #6366f1;
    --palette-indigo-600: #4f46e5;
    --palette-indigo-700: #4338ca;
    --palette-indigo-800: #3730a3;
    --palette-indigo-900: #312e81;

    /* Typography */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'Fira Code', 'Consolas', 'Monaco', monospace;

    --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;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Z-index layers */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
}

/* ===== Light theme (default) ===== */
:root {
    color-scheme: light;

    /* Semantic colors */
    --color-primary: var(--palette-primary-500);
    --color-primary-hover: var(--palette-primary-600);
    --color-primary-light: var(--palette-primary-50);
    --color-primary-dark: var(--palette-primary-700);

    --color-accent: var(--palette-accent-500);
    --color-accent-hover: var(--palette-accent-600);

    --color-success: var(--palette-success);
    --color-warning: var(--palette-warning);
    --color-error: var(--palette-error);
    --color-info: var(--palette-info);

    /* Avatar initials */
    --avatar-bg-strength: 20%;
    --avatar-text-mix: 0%;

    /* Surface & background (4-level system) */
    --color-bg-shell: #ffffff;              /* Nav & sidebar */
    --color-bg-canvas: var(--palette-gray-50);   /* Main content area */
    --color-bg-card: #ffffff;               /* Cards & panels */
    --color-bg-card-hover: var(--palette-gray-100); /* Card hover state */
    
    /* Legacy aliases (for backward compatibility) */
    --color-bg: var(--color-bg-shell);
    --color-bg-subtle: var(--color-bg-canvas);
    --color-bg-muted: var(--color-bg-card-hover);

    /* Text */
    --color-text: var(--palette-gray-900);
    --color-text-muted: var(--palette-gray-600);
    --color-text-subtle: var(--palette-gray-400);

    /* Borders */
    --color-border: var(--palette-gray-200);
    --color-border-muted: var(--palette-gray-100);

    /* 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 -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
}

/* ===== Dark theme (Tailwind-compatible .dark class) ===== */
:root.dark,
.dark {
    color-scheme: dark;

    /* Semantic colors */
    --color-primary: var(--palette-primary-400);
    --color-primary-hover: var(--palette-primary-300);
    --color-primary-light: var(--palette-primary-900);
    --color-primary-dark: var(--palette-primary-500);

    --color-accent: var(--palette-accent-500);
    --color-accent-hover: var(--palette-accent-600);

    --color-success: #4ade80;
    --color-warning: #fbbf24;
    --color-error: #f87171;
    --color-info: #22d3ee;

    /* Avatar initials */
    --avatar-bg-strength: 30%;
    --avatar-text-mix: 50%;

    /* Surface & background (4-level system with Slate) */
    --color-bg-shell: var(--palette-slate-950);      /* Nav & sidebar - deepest */
    --color-bg-canvas: var(--palette-slate-900);     /* Main content area */
    --color-bg-card: var(--palette-slate-800);       /* Cards & panels */
    --color-bg-card-hover: var(--palette-slate-700); /* Card hover state */

    /* Legacy aliases (for backward compatibility) */
    --color-bg: var(--color-bg-canvas);
    --color-bg-subtle: var(--color-bg-card);
    --color-bg-muted: var(--color-bg-card-hover);

    /* Text (using Slate) */
    --color-text: var(--palette-slate-100);
    --color-text-muted: var(--palette-slate-400);
    --color-text-subtle: var(--palette-slate-500);

    /* Borders (using Slate) */
    --color-border: var(--palette-slate-700);
    --color-border-muted: var(--palette-slate-800);

    /* Shadows (more prominent in dark mode) */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
}

/* ===== Auto dark mode (respects OS preference when no .dark class is set) ===== */
@media (prefers-color-scheme: dark) {
    :root:not(.light) {
        color-scheme: dark;

        --color-primary: var(--palette-primary-400);
        --color-primary-hover: var(--palette-primary-300);
        --color-primary-light: var(--palette-primary-900);
        --color-primary-dark: var(--palette-primary-500);

        --color-accent: var(--palette-accent-500);
        --color-accent-hover: var(--palette-accent-600);

        --color-success: #4ade80;
        --color-warning: #fbbf24;
        --color-error: #f87171;
        --color-info: #22d3ee;

        /* Avatar initials */
        --avatar-bg-strength: 30%;
        --avatar-text-mix: 50%;

        /* Surface & background (4-level system with Slate) */
        --color-bg-shell: var(--palette-slate-950);
        --color-bg-canvas: var(--palette-slate-900);
        --color-bg-card: var(--palette-slate-800);
        --color-bg-card-hover: var(--palette-slate-700);
        
        --color-bg: var(--color-bg-canvas);
        --color-bg-subtle: var(--color-bg-card);
        --color-bg-muted: var(--color-bg-card-hover);

        --color-text: var(--palette-slate-100);
        --color-text-muted: var(--palette-slate-400);
        --color-text-subtle: var(--palette-slate-500);

        --color-border: var(--palette-slate-700);
        --color-border-muted: var(--palette-slate-800);

        --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
        --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
    }
}

/* ===== Base styles ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

/* Extended transitions for smooth theme switching */
html, body, div, nav, aside, header, footer, main, section,
article, button, input, textarea, select, a, span, p, h1, h2, h3, h4, h5, h6 {
    transition: 
        background-color var(--transition-normal),
        color var(--transition-normal),
        border-color var(--transition-normal),
        box-shadow var(--transition-normal);
}

body {
    margin: 0;
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
}

/* Focus styles for accessibility */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===== Glassmorphism Utility ===== */

/* 
 * Single flexible glass class with CSS variable overrides
 * Usage: 
 *   .glass                                    → default (80% opacity, 12px blur)
 *   .glass style="--glass-opacity: 5%"        → heavy/solid variant
 *   .glass style="--glass-blur: 16px"         → stronger blur
 *   .glass style="--glass-opacity: 10%; --glass-blur: 20px" → custom
 */
.glass {
    --glass-opacity: 20%;
    --glass-blur: 12px;
    background-color: color-mix(in srgb, var(--color-bg-card, var(--color-bg)), transparent var(--glass-opacity));
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
}

/* ===== Logo Utility ===== */
/* 
 * Colorizes a white SVG logo to purple in light mode, white in dark mode
 * Usage: <img src="logo-white.svg" class="logo-brand" />
 */
.logo-brand {
    /* Filter to convert white SVG to purple (#831CEF) */
    filter: brightness(0) saturate(100%) invert(13%) sepia(100%) saturate(7400%) hue-rotate(267deg) brightness(87%) contrast(110%);
}

.dark .logo-brand,
:root.dark .logo-brand {
    filter: none; /* Keep white in dark mode */
}

@media (prefers-color-scheme: dark) {
    :root:not(.light) .logo-brand {
        filter: none; /* Keep white when OS prefers dark */
    }
}