---

## 📄 css/variables.css

```css
/* ============================================
   Suda Shopping — CSS Custom Properties
   ============================================ */

:root {
    /* ── Colors ── */
    --color-primary: #16a34a;
    --color-primary-dark: #15803d;
    --color-primary-darker: #166534;
    --color-primary-light: #22c55e;
    --color-primary-subtle: #dcfce7;
    --color-primary-faint: #f0fdf4;

    --color-bg: #ffffff;
    --color-bg-alt: #f9fafb;
    --color-bg-muted: #f3f4f6;

    --color-text: #111827;
    --color-text-secondary: #6b7280;
    --color-text-muted: #9ca3af;
    --color-text-inverse: #ffffff;

    --color-border: #e5e7eb;
    --color-border-light: #f3f4f6;
    --color-border-dark: #d1d5db;

    --color-success: #16a34a;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;

    --color-affiliate: #16a34a;
    --color-referral: #3b82f6;
    --color-lead: #8b5cf6;
    --color-sponsored: #f59e0b;

    /* ── Spacing ── */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* ── Typography ── */
    --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-family-heading: var(--font-family-base);
    --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* ── Border Radius ── */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* ── Shadows ── */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* ── Transitions ── */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* ── Layout ── */
    --container-max-width: 1200px;
    --header-height: 64px;
    --comparison-bar-height: 72px;
    --sidebar-width: 260px;

    /* ── Z-index ── */
    --z-header: 100;
    --z-dropdown: 200;
    --z-modal: 300;
    --z-comparison-bar: 150;
    --z-toast: 400;
}