/* ============================================
   DESIGN SYSTEM - Modern Design Tokens
   ============================================ */

:root {
    /* ==========================================
       COLOR PALETTE (Preserved OKLCH colors)
       ========================================== */
    --background: oklch(0.9578 0.0058 264.5321);
    --foreground: oklch(0.4355 0.0430 279.3250);
    --card: oklch(1.0000 0 0);
    --card-foreground: oklch(0.4355 0.0430 279.3250);
    --popover: oklch(0.8575 0.0145 268.4756);
    --popover-foreground: oklch(0.4355 0.0430 279.3250);
    --primary: oklch(0.5547 0.2503 297.0156);
    --primary-foreground: oklch(1.0000 0 0);
    --secondary: oklch(0.8575 0.0145 268.4756);
    --secondary-foreground: oklch(0.4355 0.0430 279.3250);
    --muted: oklch(0.9060 0.0117 264.5071);
    --muted-foreground: oklch(0.5471 0.0343 279.0837);
    --accent: oklch(0.6820 0.1448 235.3822);
    --accent-foreground: oklch(1.0000 0 0);
    --destructive: oklch(0.5505 0.2155 19.8095);
    --destructive-foreground: oklch(1.0000 0 0);
    --border: oklch(0.8083 0.0174 271.1982);
    --input: oklch(0.8575 0.0145 268.4756);
    --ring: oklch(0.5547 0.2503 297.0156);
    --chart-1: oklch(0.5547 0.2503 297.0156);
    --chart-2: oklch(0.6820 0.1448 235.3822);
    --chart-3: oklch(0.6250 0.1772 140.4448);
    --chart-4: oklch(0.6920 0.2041 42.4293);
    --chart-5: oklch(0.7141 0.1045 33.0967);
    --sidebar: oklch(0.9335 0.0087 264.5206);
    --sidebar-foreground: oklch(0.4355 0.0430 279.3250);
    --sidebar-primary: oklch(0.5547 0.2503 297.0156);
    --sidebar-primary-foreground: oklch(1.0000 0 0);
    --sidebar-accent: oklch(0.6820 0.1448 235.3822);
    --sidebar-accent-foreground: oklch(1.0000 0 0);
    --sidebar-border: oklch(0.8083 0.0174 271.1982);
    --sidebar-ring: oklch(0.5547 0.2503 297.0156);

    /* ==========================================
       TYPOGRAPHY (Preserved fonts)
       ========================================== */
    --font-sans: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-serif: Georgia, 'Times New Roman', serif;
    --font-mono: 'Fira Code', 'Consolas', 'Monaco', monospace;

    /* Font Sizes - Modern scale */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;

    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;

    /* Letter Spacing */
    --tracking-tighter: -0.05em;
    --tracking-tight: -0.025em;
    --tracking-normal: 0em;
    --tracking-wide: 0.025em;
    --tracking-wider: 0.05em;
    --tracking-widest: 0.1em;

    /* ==========================================
       SPACING SCALE
       ========================================== */
    --spacing: 0.25rem;
    --space-0: 0;
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* ==========================================
       BORDER RADIUS - Modern rounded corners
       ========================================== */
    --radius: 0.5rem;
    --radius-none: 0;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-3xl: 2rem;
    --radius-full: 9999px;

    /* ==========================================
       SHADOWS - Modern, layered shadows
       ========================================== */
    --shadow-color: 220 30% 25%;
    --shadow-2xs: 0 1px 2px 0 hsl(var(--shadow-color) / 0.04);
    --shadow-xs: 0 1px 3px 0 hsl(var(--shadow-color) / 0.06),
                 0 1px 2px -1px hsl(var(--shadow-color) / 0.06);
    --shadow-sm: 0 2px 4px -1px hsl(var(--shadow-color) / 0.08),
                 0 1px 2px -1px hsl(var(--shadow-color) / 0.04);
    --shadow: 0 4px 6px -1px hsl(var(--shadow-color) / 0.08),
              0 2px 4px -2px hsl(var(--shadow-color) / 0.06);
    --shadow-md: 0 6px 12px -2px hsl(var(--shadow-color) / 0.1),
                 0 3px 6px -3px hsl(var(--shadow-color) / 0.08);
    --shadow-lg: 0 12px 24px -4px hsl(var(--shadow-color) / 0.12),
                 0 4px 8px -4px hsl(var(--shadow-color) / 0.08);
    --shadow-xl: 0 20px 40px -8px hsl(var(--shadow-color) / 0.14),
                 0 8px 16px -8px hsl(var(--shadow-color) / 0.1);
    --shadow-2xl: 0 32px 64px -12px hsl(var(--shadow-color) / 0.2);
    --shadow-inner: inset 0 2px 4px 0 hsl(var(--shadow-color) / 0.05);

    /* Colored shadows for interactive elements */
    --shadow-primary: 0 4px 14px -2px oklch(0.5547 0.2503 297.0156 / 0.35);
    --shadow-success: 0 4px 14px -2px oklch(0.6250 0.1772 140.4448 / 0.35);
    --shadow-warning: 0 4px 14px -2px oklch(0.6920 0.2041 42.4293 / 0.35);
    --shadow-danger: 0 4px 14px -2px oklch(0.5505 0.2155 19.8095 / 0.35);

    /* ==========================================
       TRANSITIONS & ANIMATIONS
       ========================================== */
    --transition-fast: 150ms;
    --transition-base: 200ms;
    --transition-slow: 300ms;
    --transition-slower: 500ms;

    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* ==========================================
       Z-INDEX SCALE
       ========================================== */
    --z-0: 0;
    --z-10: 10;
    --z-20: 20;
    --z-30: 30;
    --z-40: 40;
    --z-50: 50;
    --z-sticky: 100;
    --z-fixed: 200;
    --z-dropdown: 1000;
    --z-modal: 1100;
    --z-popover: 1200;
    --z-tooltip: 1300;
    --z-toast: 1400;

    /* ==========================================
       LAYOUT
       ========================================== */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1400px;

    /* ==========================================
       GLASSMORPHISM EFFECTS
       ========================================== */
    --glass-bg: oklch(1 0 0 / 0.7);
    --glass-border: oklch(1 0 0 / 0.2);
    --glass-blur: blur(12px);
}

/* ============================================
   DARK MODE THEME
   ============================================ */
.dark {
    --background: oklch(0.2155 0.0254 284.0647);
    --foreground: oklch(0.8787 0.0426 272.2767);
    --card: oklch(0.2429 0.0304 283.9110);
    --card-foreground: oklch(0.8787 0.0426 272.2767);
    --popover: oklch(0.4037 0.0320 280.1520);
    --popover-foreground: oklch(0.8787 0.0426 272.2767);
    --primary: oklch(0.7871 0.1187 304.7693);
    --primary-foreground: oklch(0.2429 0.0304 283.9110);
    --secondary: oklch(0.4765 0.0340 278.6430);
    --secondary-foreground: oklch(0.8787 0.0426 272.2767);
    --muted: oklch(0.2973 0.0294 276.2144);
    --muted-foreground: oklch(0.7510 0.0396 273.9320);
    --accent: oklch(0.8467 0.0833 210.2545);
    --accent-foreground: oklch(0.2429 0.0304 283.9110);
    --destructive: oklch(0.7556 0.1297 2.7642);
    --destructive-foreground: oklch(0.2429 0.0304 283.9110);
    --border: oklch(0.3240 0.0319 281.9784);
    --input: oklch(0.3240 0.0319 281.9784);
    --ring: oklch(0.7871 0.1187 304.7693);
    --chart-1: oklch(0.7871 0.1187 304.7693);
    --chart-2: oklch(0.8467 0.0833 210.2545);
    --chart-3: oklch(0.8577 0.1092 142.7153);
    --chart-4: oklch(0.8237 0.1015 52.6294);
    --chart-5: oklch(0.9226 0.0238 30.4919);
    --sidebar: oklch(0.1828 0.0204 284.2039);
    --sidebar-foreground: oklch(0.8787 0.0426 272.2767);
    --sidebar-primary: oklch(0.7871 0.1187 304.7693);
    --sidebar-primary-foreground: oklch(0.2429 0.0304 283.9110);
    --sidebar-accent: oklch(0.8467 0.0833 210.2545);
    --sidebar-accent-foreground: oklch(0.2429 0.0304 283.9110);
    --sidebar-border: oklch(0.4037 0.0320 280.1520);
    --sidebar-ring: oklch(0.7871 0.1187 304.7693);

    /* Dark mode shadows */
    --shadow-color: 220 50% 5%;
    --glass-bg: oklch(0.2429 0.0304 283.9110 / 0.7);
    --glass-border: oklch(1 0 0 / 0.1);
}

/* ============================================
   THEME MAPPING FOR TAILWIND-LIKE USAGE
   ============================================ */
@theme inline {
    --color-background: var(--background);
    --color-foreground: var(--foreground);
    --color-card: var(--card);
    --color-card-foreground: var(--card-foreground);
    --color-popover: var(--popover);
    --color-popover-foreground: var(--popover-foreground);
    --color-primary: var(--primary);
    --color-primary-foreground: var(--primary-foreground);
    --color-secondary: var(--secondary);
    --color-secondary-foreground: var(--secondary-foreground);
    --color-muted: var(--muted);
    --color-muted-foreground: var(--muted-foreground);
    --color-accent: var(--accent);
    --color-accent-foreground: var(--accent-foreground);
    --color-destructive: var(--destructive);
    --color-destructive-foreground: var(--destructive-foreground);
    --color-border: var(--border);
    --color-input: var(--input);
    --color-ring: var(--ring);
    --color-chart-1: var(--chart-1);
    --color-chart-2: var(--chart-2);
    --color-chart-3: var(--chart-3);
    --color-chart-4: var(--chart-4);
    --color-chart-5: var(--chart-5);
    --color-sidebar: var(--sidebar);
    --color-sidebar-foreground: var(--sidebar-foreground);
    --color-sidebar-primary: var(--sidebar-primary);
    --color-sidebar-primary-foreground: var(--sidebar-primary-foreground);
    --color-sidebar-accent: var(--sidebar-accent);
    --color-sidebar-accent-foreground: var(--sidebar-accent-foreground);
    --color-sidebar-border: var(--sidebar-border);
    --color-sidebar-ring: var(--sidebar-ring);

    --font-sans: var(--font-sans);
    --font-mono: var(--font-mono);
    --font-serif: var(--font-serif);

    --radius-sm: var(--radius-sm);
    --radius-md: var(--radius-md);
    --radius-lg: var(--radius-lg);
    --radius-xl: var(--radius-xl);

    --shadow-2xs: var(--shadow-2xs);
    --shadow-xs: var(--shadow-xs);
    --shadow-sm: var(--shadow-sm);
    --shadow: var(--shadow);
    --shadow-md: var(--shadow-md);
    --shadow-lg: var(--shadow-lg);
    --shadow-xl: var(--shadow-xl);
    --shadow-2xl: var(--shadow-2xl);
}

/* ============================================
   CSS RESET & BASE NORMALIZATION
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--foreground);
    background-color: var(--background);
    min-height: 100vh;
}

/* ============================================
   FOCUS & ACCESSIBILITY
   ============================================ */
:focus-visible {
    outline: 2px solid var(--ring);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* Selection styling */
::selection {
    background-color: var(--primary);
    color: var(--primary-foreground);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--muted);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: var(--radius-full);
    transition: background var(--transition-fast) var(--ease-out);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--muted-foreground);
}

/* ============================================
   KEYFRAME ANIMATIONS
   ============================================ */
@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

@keyframes slide-down {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slide-in-right {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slide-out-right {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

@keyframes scale-in {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes progress-fill {
    from { width: 0; }
}

@keyframes bounce-subtle {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

/* Animation utility classes */
.animate-fade-in {
    animation: fade-in var(--transition-base) var(--ease-out);
}

.animate-slide-up {
    animation: slide-up var(--transition-slow) var(--ease-out);
}

.animate-slide-down {
    animation: slide-down var(--transition-slow) var(--ease-out);
}

.animate-scale-in {
    animation: scale-in var(--transition-base) var(--ease-spring);
}

.animate-spin {
    animation: spin 1s linear infinite;
}

.animate-pulse {
    animation: pulse 2s var(--ease-in-out) infinite;
}

.animate-shimmer {
    background: linear-gradient(
        90deg,
        transparent 0%,
        oklch(1 0 0 / 0.1) 50%,
        transparent 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}