:root {
    /* --- Core Palette (Apple & Stripe Inspired) --- */
    --color-primary: #FF6600; /* GasFlow Orange */
    --color-primary-soft: rgba(255, 102, 0, 0.1);
    --color-primary-dark: #e65c00;
    
    --color-slate-50: #f8fafc;
    --color-slate-100: #f1f5f9;
    --color-slate-200: #e2e8f0;
    --color-slate-300: #cbd5e1;
    --color-slate-400: #94a3b8;
    --color-slate-500: #64748b;
    --color-slate-600: #475569;
    --color-slate-700: #334155;
    --color-slate-800: #1e293b;
    --color-slate-900: #0f172a;

    --bg-body: #f5f5f7;
    --bg-card: rgba(255, 255, 255, 0.8);
    
    /* --- Status Colors --- */
    --color-success: #34c759;
    --color-warning: #ff9500;
    --color-danger: #ff3b30;
    --color-info: #007aff;

    /* --- Border Radius --- */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --radius-2xl: 32px;

    /* --- Shadows & Elevations --- */
    --elevation-1: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.1);
    --elevation-2: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
    --elevation-3: 0 20px 25px -5px rgba(0,0,0,0.05), 0 10px 10px -5px rgba(0,0,0,0.02);
    --elevation-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.07);

    /* --- Typography --- */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* --- Transitions --- */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}