:root {
  /* Color Palette */
  --color-background: #050814;
  --color-surface: #0b1020;
  --color-surface-alt: #121729;
  --color-surface-elevated: #181f33;

  --color-text: #f5f7ff;
  --color-text-muted: #a4adc4;
  --color-border-subtle: #252c40;

  --color-primary: #3b82f6; /* tech blue */
  --color-primary-soft: rgba(59, 130, 246, 0.15);
  --color-primary-hover: #2563eb;
  --color-primary-active: #1d4ed8;

  --color-success: #22c55e;
  --color-success-soft: rgba(34, 197, 94, 0.12);
  --color-warning: #eab308;
  --color-warning-soft: rgba(234, 179, 8, 0.14);
  --color-danger: #ef4444;
  --color-danger-soft: rgba(239, 68, 68, 0.15);

  /* Neutral Grays (cool / techy) */
  --gray-50: #0b0f1a;
  --gray-100: #111827;
  --gray-200: #1f2937;
  --gray-300: #2d3748;
  --gray-400: #4b5563;
  --gray-500: #6b7280;
  --gray-600: #9ca3af;
  --gray-700: #d1d5db;
  --gray-800: #e5e7eb;
  --gray-900: #f9fafb;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem;  /* 14px */
  --font-size-base: 1rem;    /* 16px */
  --font-size-lg: 1.125rem;  /* 18px */
  --font-size-xl: 1.25rem;   /* 20px */
  --font-size-2xl: 1.5rem;   /* 24px */
  --font-size-3xl: 1.875rem; /* 30px */
  --font-size-4xl: 2.25rem;  /* 36px */

  --line-height-tight: 1.2;
  --line-height-snug: 1.35;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* Spacing Scale (0–96px) */
  --space-0: 0;
  --space-4: 0.25rem;  /* 4px */
  --space-8: 0.5rem;   /* 8px */
  --space-12: 0.75rem; /* 12px */
  --space-16: 1rem;    /* 16px */
  --space-20: 1.25rem; /* 20px */
  --space-24: 1.5rem;  /* 24px */
  --space-32: 2rem;    /* 32px */
  --space-40: 2.5rem;  /* 40px */
  --space-48: 3rem;    /* 48px */
  --space-64: 4rem;    /* 64px */
  --space-80: 5rem;    /* 80px */
  --space-96: 6rem;    /* 96px */

  /* Radii */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 999px;

  /* Shadows (subtle, tech-style) */
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.45);
  --shadow-lg: 0 20px 45px rgba(15, 23, 42, 0.6);
  --shadow-soft-primary: 0 0 0 1px rgba(59, 130, 246, 0.16), 0 18px 45px rgba(15, 23, 42, 0.65);

  /* Transitions & Motion */
  --transition-fast: 120ms ease-out;
  --transition-base: 180ms ease-out;
  --transition-slow: 260ms ease-out;
  --transition-bezier: cubic-bezier(0.22, 0.61, 0.36, 1);

  --focus-ring-color: rgba(59, 130, 246, 0.65);
  --focus-ring-offset: 2px;
  --focus-ring-width: 2px;
}

/* ========================================
   Reset / Normalize
   ======================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

body {
  margin: 0;
}

h1,
h2,
h3,
h4,
h5,
h6,
p,
figure,
blockquote,
ol,
ul,
dl,
dd {
  margin: 0;
}

ol,
ul {
  padding-left: 1.5rem;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

button,
input,
select,
textarea {
  margin: 0;
  font: inherit;
  color: inherit;
}

button {
  border: none;
  background: none;
  padding: 0;
}

fieldset {
  border: 0;
  margin: 0;
  padding: 0;
}

textarea {
  resize: vertical;
}

:root {
  color-scheme: dark;
}

/* ========================================
   Base Styles
   ======================================== */

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  background-color: var(--color-background);
  color: var(--color-text);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

main {
  min-height: 60vh;
}

/* Headings: techy, clear hierarchy */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  letter-spacing: 0.01em;
  color: var(--color-text);
}

h1 {
  font-size: clamp(2rem, 3vw, var(--font-size-4xl));
  margin-bottom: var(--space-24);
}

h2 {
  font-size: clamp(1.5rem, 2.2vw, var(--font-size-3xl));
  margin-bottom: var(--space-20);
}

h3 {
  font-size: clamp(1.25rem, 1.8vw, var(--font-size-2xl));
  margin-bottom: var(--space-16);
}

h4 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-12);
}

h5 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-8);
}

h6 {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

p {
  margin-bottom: var(--space-16);
  line-height: var(--line-height-relaxed);
  }

p:last-child {
  margin-bottom: 0;
}

/* Links: understated, tech-inspired */

a {
  color: var(--color-primary);
  text-decoration: none;
  cursor: pointer;
  transition: color var(--transition-base) var(--transition-bezier),
    text-shadow var(--transition-base) var(--transition-bezier);
}

a:hover {
  color: var(--color-primary-hover);
}

a:active {
  color: var(--color-primary-active);
}

a:focus-visible {
  outline: none;
}

/* Lists & Misc */

ul,
ol {
  margin-bottom: var(--space-16);
}

small {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

code,
pre,
kbd {
  font-family: var(--font-mono);
}

pre {
  margin: 0;
}

/* ========================================
   Accessibility & Motion
   ======================================== */

:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ========================================
   Layout Utilities
   ======================================== */

/* Container: for main content and product grids */

.container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-16);
  padding-right: var(--space-16);
  max-width: 1200px;
}

@media (min-width: 1440px) {
  .container {
    max-width: 1320px;
  }
}

/* Flex Helpers */

.flex {
  display: flex;
}

.inline-flex {
  display: inline-flex;
}

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

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

.flex-col {
  display: flex;
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

.gap-8 {
  gap: var(--space-8);
}

.gap-16 {
  gap: var(--space-16);
}

.gap-24 {
  gap: var(--space-24);
}

/* Grid Helpers (for product listings) */

.grid {
  display: grid;
}

.grid-auto-fit-min-200 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-24);
}

.grid-auto-fit-min-260 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-24);
}

/* Alignment & Text Utilities */

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.text-muted {
  color: var(--color-text-muted);
}

/* Spacing Utilities (common for e-commerce layout) */

.mt-16 {
  margin-top: var(--space-16);
}

.mt-24 {
  margin-top: var(--space-24);
}

.mt-32 {
  margin-top: var(--space-32);
}

.mb-16 {
  margin-bottom: var(--space-16);
}

.mb-24 {
  margin-bottom: var(--space-24);
}

.mb-32 {
  margin-bottom: var(--space-32);
}

.py-16 {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

.py-24 {
  padding-top: var(--space-24);
  padding-bottom: var(--space-24);
}

.py-32 {
  padding-top: var(--space-32);
  padding-bottom: var(--space-32);
}

/*******************************************
  Screen Reader Only Utility
*******************************************/

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.sr-only-focusable:active,
.sr-only-focusable:focus {
  position: static;
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* ========================================
   Components
   ======================================== */

/* Buttons: primary CTAs for koszyk / checkout */

.button,
button,
input[type="button"],
input[type="submit"],
input[type="reset"] {
  --btn-bg: var(--color-primary);
  --btn-bg-hover: var(--color-primary-hover);
  --btn-bg-active: var(--color-primary-active);
  --btn-color: #ffffff;
  --btn-border-color: transparent;

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);

  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--btn-border-color);

  font-size: var(--font-size-sm);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-decoration: none;
  text-transform: none;

  background-color: var(--btn-bg);
  color: var(--btn-color);
  cursor: pointer;

  transition:
    background-color var(--transition-base) var(--transition-bezier),
    color var(--transition-fast) var(--transition-bezier),
    box-shadow var(--transition-base) var(--transition-bezier),
    transform var(--transition-fast) var(--transition-bezier),
    border-color var(--transition-base) var(--transition-bezier);
}

.button:hover,
button:hover,
input[type="button"]:hover,
input[type="submit"]:hover,
input[type="reset"]:hover {
  background-color: var(--btn-bg-hover);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
  color: var(--btn-color);
}

.button:active,
button:active,
input[type="button"]:active,
input[type="submit"]:active,
input[type="reset"]:active {
  background-color: var(--btn-bg-active);
  box-shadow: none;
  transform: translateY(0);
}

.button--secondary {
  --btn-bg: transparent;
  --btn-bg-hover: rgba(15, 23, 42, 0.9);
  --btn-bg-active: rgba(15, 23, 42, 1);
  --btn-color: var(--color-text)!important;
  --btn-border-color: var(--color-border-subtle);
}

.button--ghost {
  --btn-bg: transparent;
  --btn-bg-hover: var(--color-primary-soft);
  --btn-bg-active: rgba(15, 23, 42, 1);
  --btn-color: var(--color-primary)!important;
  --btn-border-color: rgba(59, 130, 246, 0.2);
}

.button--danger {
  --btn-bg: var(--color-danger);
  --btn-bg-hover: #dc2626!important;
  --btn-bg-active: #b91c1c;
}

.button:disabled,
button:disabled,
input[type="button"]:disabled,
input[type="submit"]:disabled,
input[type="reset"]:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

.button:focus-visible,
button:focus-visible,
input[type="button"]:focus-visible,
input[type="submit"]:focus-visible,
input[type="reset"]:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: calc(var(--focus-ring-offset) + 1px);
}

/* Inputs: for wyszukiwarka, logowanie, checkout */

.input,
select,
textarea,
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="number"],
input[type="tel"],
input[type="url"] {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background-color: var(--color-surface-alt);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: 1.3;

  transition:
    border-color var(--transition-base) var(--transition-bezier),
    box-shadow var(--transition-base) var(--transition-bezier),
    background-color var(--transition-base) var(--transition-bezier);
}

.input::placeholder,
input::placeholder,
textarea::placeholder {
  color: var(--color-text-muted);
}

.input:focus,
select:focus,
textarea:focus,
input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="search"]:focus,
input[type="number"]:focus,
input[type="tel"]:focus,
input[type="url"]:focus {
  outline: none;
  border-color: rgba(59, 130, 246, 0.85);
  box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.65);
  background-color: var(--color-surface);
}

input[readonly],
.input[readonly] {
  opacity: 0.8;
}

input:disabled,
select:disabled,
textarea:disabled,
.input:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Cards: for product tiles, promo boxes, info blocks */

.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(148, 163, 184, 0.16);
  padding: var(--space-16);
  box-shadow: 0 18px 35px rgba(15, 23, 42, 0.55);
  transition:
    transform var(--transition-base) var(--transition-bezier),
    box-shadow var(--transition-base) var(--transition-bezier),
    border-color var(--transition-base) var(--transition-bezier),
    background-color var(--transition-base) var(--transition-bezier);
}

.card--interactive {
  cursor: pointer;
}

.card--interactive:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft-primary);
  border-color: rgba(59, 130, 246, 0.45);
  background: radial-gradient(circle at top left, rgba(59, 130, 246, 0.15), transparent 55%),
    var(--color-surface);
}

.card-header {
  margin-bottom: var(--space-12);
}

.card-body {
  font-size: var(--font-size-sm);
}

.card-footer {
  margin-top: var(--space-16);
}

/* Badge: e.g., "Promocja", "Nowość" */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.18rem 0.55rem;
  border-radius: var(--radius-pill);
  font-size: var(--font-size-xs);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid transparent;
}

.badge--primary {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  border-color: rgba(59, 130, 246, 0.4);
}

.badge--success {
  background-color: var(--color-success-soft);
  color: var(--color-success);
  border-color: rgba(34, 197, 94, 0.35);
}

.badge--danger {
  background-color: var(--color-danger-soft);
  color: var(--color-danger);
  border-color: rgba(239, 68, 68, 0.4);
}

/* Price styling (frequent in e-commerce) */

.price {
  font-size: var(--font-size-xl);
  font-weight: 600;
}

.price--old {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-decoration: line-through;
}

.price--promo {
  color: var(--color-success);
}

/* Subtle divider */

.divider {
  border: 0;
  border-top: 1px solid var(--color-border-subtle);
  margin: var(--space-16) 0;
}

/* Topbar / header subtle blur backdrop utility */

.backdrop-blur {
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

/* Utility: surface background wrappers */

.surface {
  background-color: var(--color-surface);
}

.surface-alt {
  background-color: var(--color-surface-alt);
}

.surface-elevated {
  background-color: var(--color-surface-elevated);
}

/* Utility: limited width text blocks for descriptions */

.content-narrow {
  max-width: 720px;
}