:root {
    /* Color Palette - Premium Light Mode */
    --bg-base: #f8fafc;       /* Light gray base */
    --bg-surface: #ffffff;    /* Pure white surface */
    --bg-surface-elevated: #f1f5f9; /* Slate 100 for elevation/hover */
    
    --primary: #6366f1;       /* Indigo 500 */
    --primary-hover: #4f46e5; /* Indigo 600 */
    --primary-glow: rgba(99, 102, 241, 0.2);
    
    --accent: #0ea5e9;        /* Sky 500 */
    --success: #10b981;       /* Emerald 500 */
    --warning: #f59e0b;       /* Amber 500 */
    --danger: #ef4444;        /* Red 500 */

    --text-primary: #0f172a;  /* Dark Slate for contrast */
    --text-secondary: #475569;/* Slate 600 */
    --text-muted: #94a3b8;    /* Slate 400 */

    --border: #e2e8f0;        /* Slate 200 */
    
    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    /* Layout */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-pill: 9999px;
    
    /* Effects */
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.03), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 10px 25px -3px rgba(0, 0, 0, 0.05), 0 4px 10px -4px rgba(0, 0, 0, 0.03);
    --shadow-glow: 0 0 25px var(--primary-glow);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    letter-spacing: -0.02em;
}

/* Glassmorphism Utilities applied for Light Mode */
.glass {
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.9);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.04);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-heading);
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.95rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--primary-glow);
    filter: brightness(1.1);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-outline:hover {
    background: var(--bg-surface-elevated);
}

.full-width {
    width: 100%;
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Input Fields */
input[type="text"], input[type="email"], input[type="password"], input[type="number"], select {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-body);
    transition: var(--transition);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
}

/* Global Nav Icons Grayscale Filter */
.nav-icon {
    filter: grayscale(100%);
    opacity: 0.75;
    display: inline-block;
}