:root {
    /* Premium Color Palette (HSL) */
    --color-bg: 240 10% 3.9%;
    --color-fg: 0 0% 98%;
    --color-card: 240 10% 3.9%;
    --color-card-fg: 0 0% 98%;
    --color-popover: 240 10% 3.9%;
    --color-popover-fg: 0 0% 98%;
    --color-primary: 263.4 70% 50.4%;  /* Vibrant Violet */
    --color-primary-fg: 210 40% 98%;
    --color-secondary: 240 3.7% 15.9%;
    --color-secondary-fg: 0 0% 98%;
    --color-muted: 240 3.7% 15.9%;
    --color-muted-fg: 240 5% 64.9%;
    --color-accent: 240 3.7% 15.9%;
    --color-accent-fg: 0 0% 98%;
    --color-destructive: 0 62.8% 30.6%;
    --color-destructive-fg: 0 0% 98%;
    --color-border: 240 3.7% 15.9%;
    --color-input: 240 3.7% 15.9%;
    --color-ring: 240 4.9% 83.9%;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    /* Spacing & Radius */
    --radius: 0.75rem;
}

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

body {
    background-color: hsl(var(--color-bg));
    color: hsl(var(--color-fg));
    font-family: var(--font-sans);
    -webkit-font-smoothing: antialiased;
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Typography Utilities */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 600;
    letter-spacing: -0.025em;
    color: hsl(var(--color-fg));
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s;
}

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

/* Layout Utilities */
.container {
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    padding-left: 2rem;
    padding-right: 2rem;
    max-width: 1200px;
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-4 { gap: 1rem; }
.gap-8 { gap: 2rem; }
.p-4 { padding: 1rem; }
.p-8 { padding: 2rem; }
.py-12 { padding-top: 3rem; padding-bottom: 3rem; }
.min-h-screen { min-height: 100vh; }
.w-full { width: 100%; }

/* Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    font-size: 0.875rem;
}

.btn-primary {
    background-color: hsl(var(--color-primary));
    color: hsl(var(--color-primary-fg));
    box-shadow: 0 4px 14px 0 rgba(0, 0, 0, 0.3);
}

.btn-primary:hover {
    background-color: hsl(var(--color-primary) / 0.9);
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    border-color: hsl(var(--color-border));
    color: hsl(var(--color-fg));
}

.btn-outline:hover {
    background-color: hsl(var(--color-accent));
}

.card {
    background-color: hsl(var(--color-card));
    border: 1px solid hsl(var(--color-border));
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: 0 0 0 1px rgba(0,0,0,0.1), 0 2px 4px rgba(0,0,0,0.1);
}

.input {
    width: 100%;
    padding: 0.75rem;
    background-color: transparent;
    border: 1px solid hsl(var(--color-input));
    border-radius: var(--radius);
    color: hsl(var(--color-fg));
    margin-bottom: 1rem;
    font-size: 1rem;
}

.input:focus {
    outline: none;
    border-color: hsl(var(--color-primary));
    box-shadow: 0 0 0 2px hsl(var(--color-primary) / 0.2);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.5s ease-out forwards;
}