:root {
    /* Brand Colors */
    --primary: #2563EB;
    --primary-dark: #1E40AF;
    --secondary: #64748B;
    --success: #10B981;
    --warning: #F59E0B;
    --error: #EF4444;
    --background: #F8FAFC;
    --surface: #FFFFFF;
    
    /* Text Colors */
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-light: #94A3B8;
  
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
  
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
  
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    /* Font */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

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

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

a {
    text-decoration: none;
    color: inherit;
}

button {
    cursor: pointer;
    font-family: inherit;
}

/* Typography Utilities */
.text-h1 { font-size: 24px; font-weight: 700; }
.text-h2 { font-size: 20px; font-weight: 600; }
.text-h3 { font-size: 18px; font-weight: 600; }
.text-body { font-size: 16px; font-weight: 400; }
.text-sm { font-size: 14px; font-weight: 400; }
.text-xs { font-size: 12px; font-weight: 500; }

.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-secondary { color: var(--text-secondary); }
.text-error { color: var(--error); }

/* Component: Button */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all 0.2s;
    border: none;
    width: 100%;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
}

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

.btn-text {
    background: none;
    color: var(--primary);
    padding: 8px;
}

/* Component: Input */
.form-group {
    margin-bottom: 16px;
    text-align: left;
}

.label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.input {
    width: 100%;
    padding: 12px;
    border-radius: var(--radius-md);
    border: 1px solid #E2E8F0;
    background-color: white;
    font-size: 16px;
    transition: 0.2s;
}

.input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Component: Card */
.card {
    background: white;
    padding: 16px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: 16px;
}

/* Utility Layouts */
.container {
    max-width: 480px; /* Mobile focused */
    margin: 0 auto;
    padding: 16px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.grid-cols-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.w-full { width: 100%; }
.hidden { display: none; }