:root {
    --clr-primary: #333e48;
    --clr-primary-dark: #181818;
    --clr-primary-text: #ffffff;
    --clr-primary-light: #f5f5f5;
    --clr-secondary: #f5f5f5;
    --clr-accent: #fed700;
    --clr-link: #0062bd;
    --clr-dark: #333e48;
    --clr-text: #333e48;
    --clr-text-light: #6c757d;
    --clr-bg: #ffffff;
    --clr-bg-alt: #fafafa;
    --clr-border: #dddddd;
    --clr-border-light: #d9d9d9;
    --clr-success: #198754;
    --clr-warning: #333e48;
    --clr-danger: #dc3545;
    --clr-info: #0062bd;
    --clr-star: #fed700;
    --clr-overlay: rgba(34, 34, 34, 0.6);

    --ff-heading: Inter, "Segoe UI", system-ui, sans-serif;
    --ff-body: Inter, "Segoe UI", system-ui, sans-serif;
    --ff-accent: Inter, "Segoe UI", system-ui, sans-serif;

    --fs-xs: 0.75rem;
    --fs-sm: 0.875rem;
    --fs-base: 1rem;
    --fs-md: 1.125rem;
    --fs-lg: 1.25rem;
    --fs-xl: 1.5rem;
    --fs-2xl: 2rem;
    --fs-3xl: 2.5rem;
    --fs-4xl: 3rem;
    --fs-5xl: 3.5rem;

    --fw-light: 300;
    --fw-regular: 400;
    --fw-medium: 500;
    --fw-semibold: 600;
    --fw-bold: 700;

    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 50%;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 15px 50px rgba(0, 0, 0, 0.12);

    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    --header-height: 140px;
    --header-sticky-height: 70px;
    --container-max: 1320px;
    --sidebar-width: 280px;

    /* GeekZone system — taken from geekzone.pro (Electro black scheme): black chrome, white surfaces,
       #333e48 ink, yellow kept for the active / selected indicator only. */
    --gz-black: #000000;
    --gz-ink: #333e48;
    --gz-ink-strong: #181818;
    --gz-stage: #0b0e12;
    --gz-stage-2: #161b22;
    --gz-surface: #ffffff;
    --gz-surface-alt: #f5f5f5;
    --gz-line: #e6e6e6;
    --gz-line-dark: rgba(255, 255, 255, 0.12);
    --gz-muted: #5c6670;
    --gz-muted-dark: #9aa4ae;
    --gz-accent: #fed700;
    --gz-link: #0062bd;
    --gz-price: #dc3545;
    --gz-promo: #198754;

    --gz-radius-card: 10px;
    --gz-radius-pill: 999px;
    --gz-shadow-card: 0 1px 2px rgba(0, 0, 0, 0.04), 0 6px 18px rgba(0, 0, 0, 0.06);
    --gz-shadow-hover: 0 14px 34px rgba(0, 0, 0, 0.12);
    --gz-shadow-stage: 0 30px 60px rgba(0, 0, 0, 0.45);

    --gz-ease: cubic-bezier(0.22, 1, 0.36, 1);
    --gz-ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --gz-dur-fast: 160ms;
    --gz-dur: 320ms;
    --gz-dur-slow: 620ms;

    --gz-section-gap: clamp(2rem, 4vw, 3.5rem);
    --gz-card-w-sm: 180px;
    --gz-card-w-md: 220px;
    --gz-card-w-lg: 270px;
    /* Breakpoints (reference): sm 576, md 768, lg 992, xl 1200 — same as Bootstrap 5. */
}