/* ========================================================================== */
/* Variables                                                                  */
/* ========================================================================== */

:root {
  /* Color palette - inspired by stone, concrete gray, deep blue */
  --color-background: #f5f6f8; /* light neutral for app shell */
  --color-surface: #ffffff;
  --color-surface-muted: #edf0f3;

  --color-text: #111827; /* near-black for readability */
  --color-text-muted: #4b5563;
  --color-text-soft: #6b7280;

  --color-primary: #1f3b5f; /* deep, trustworthy blue */
  --color-primary-soft: #27466f;
  --color-primary-light: #c9d5e7;

  --color-success: #0f766e;
  --color-warning: #d97706;
  --color-danger: #b91c1c;

  --color-border-subtle: #d1d5db;
  --color-border-strong: #9ca3af;

  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2933;
  --color-gray-900: #111827;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji",
    "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;

  /* Base font sizing uses a 16px root; scale for headings */
  --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-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* Spacing scale (0–96px) */
  --space-0: 0;
  --space-1: 0.125rem;  /* 2px */
  --space-2: 0.25rem;   /* 4px */
  --space-3: 0.375rem;  /* 6px */
  --space-4: 0.5rem;    /* 8px */
  --space-5: 0.625rem;  /* 10px */
  --space-6: 0.75rem;   /* 12px */
  --space-7: 0.875rem;  /* 14px */
  --space-8: 1rem;      /* 16px */
  --space-9: 1.25rem;   /* 20px */
  --space-10: 1.5rem;   /* 24px */
  --space-11: 1.75rem;  /* 28px */
  --space-12: 2rem;     /* 32px */
  --space-14: 2.5rem;   /* 40px */
  --space-16: 3rem;     /* 48px */
  --space-20: 4rem;     /* 64px */
  --space-24: 6rem;     /* 96px */

  /* Radius */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;
  --radius-xl: 14px;
  --radius-full: 9999px;

  /* Shadows - industrial but subtle */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.10);
  --shadow-lg: 0 12px 30px rgba(15, 23, 42, 0.15);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-base: 180ms ease-out;
  --transition-slow: 250ms ease-out;

  /* Layout */
  --container-max-width: 1200px;
  --container-gutter: 1.5rem;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  :root {
    scroll-behavior: auto;
  }
}

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

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

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

body {
  min-height: 100vh;
}

ul[role="list"],
ol[role="list"] {
  list-style: none;
  margin: 0;
  padding: 0;
}

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

img {
  height: auto;
}

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

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

textarea {
  resize: vertical;
}

/* Remove default focus outlines; we reintroduce via :focus-visible */
:focus {
  outline: none;
}

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

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

main {
  display: block;
}

/* Headings: structured hierarchy for product & category pages */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 {
  font-size: var(--font-size-4xl);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-8);
}

h2 {
  font-size: var(--font-size-3xl);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-6);
}

h3 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-5);
}

h4 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-4);
}

h5 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-3);
}

h6 {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-soft);
  margin-bottom: var(--space-2);
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
  /* comfortable line length for product descriptions */
}

strong {
  font-weight: 600;
  color: var(--color-text);
}

small {
  font-size: var(--font-size-sm);
}

/* Links - understated but clear, no default underline */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

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

/* Lists */
ul,
ol {
  padding-left: 1.25rem;
  margin-bottom: var(--space-4);
}

/* Horizontal rule - subtle separators for industrial layout */
hr {
  border: 0;
  border-top: 1px solid var(--color-border-subtle);
  margin: var(--space-10) 0;
}

/* ========================================================================== */
/* Accessibility                                                              */
/* ========================================================================== */

/* Focus-visible outlines - consistent and high-contrast */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* 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;
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

/* Container for main content width */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-gutter);
  padding-right: var(--container-gutter);
}

/* Flex helpers for layout of product cards, filters, etc. */
.flex {
  display: flex;
}

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

.flex-row {
  flex-direction: row;
}

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

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

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

.items-start {
  align-items: flex-start;
}

.items-end {
  align-items: flex-end;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-end {
  justify-content: flex-end;
}

.gap-sm {
  gap: var(--space-4);
}

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

.gap-lg {
  gap: var(--space-12);
}

/* Simple grid utilities for product listings */
.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-8);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-8);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-8);
}

@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .grid-4,
  .grid-3,
  .grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .grid-4,
  .grid-3,
  .grid-2 {
    grid-template-columns: minmax(0, 1fr);
  }

  .card__footer {
    flex-direction: column;
    align-items: flex-start !important;
    gap: var(--space-4);
  }
}

/* Spacing utilities (example set; extend as needed) */
.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space-4); }
.mt-md { margin-top: var(--space-8); }
.mt-lg { margin-top: var(--space-12); }

.mb-0 { margin-bottom: 0; }
.mb-xs { margin-bottom: var(--space-2); }
.mb-sm { margin-bottom: var(--space-4); }
.mb-md { margin-bottom: var(--space-8); }
.mb-lg { margin-bottom: var(--space-12); }

.pt-sm { padding-top: var(--space-4); }
.pt-md { padding-top: var(--space-8); }
.pt-lg { padding-top: var(--space-12); }

.pb-sm { padding-bottom: var(--space-4); }
.pb-md { padding-bottom: var(--space-8); }
.pb-lg { padding-bottom: var(--space-12); }

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

/* Utility for constrained content width inside sections */
.text-max-width {
  max-width: 70ch;
}

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

/* Buttons - primary actions (e.g., "Dodaj do koszyka") */
.button,
button.button,
input[type="button"].button,
input[type="submit"].button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background-color var(--transition-base),
    color var(--transition-base),
    box-shadow var(--transition-base),
    border-color var(--transition-base),
    transform var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.button:hover {
  background-color: var(--color-primary-soft);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  color: #ffffff;
}

.button:active {
  background-color: var(--color-primary);
  box-shadow: var(--shadow-xs);
  transform: translateY(0);
}

.button:focus-visible {
  outline: 2px solid var(--color-primary-light);
  outline-offset: 2px;
}

.button[disabled],
.button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  box-shadow: none;
}

/* Button variants */
.button--secondary {
  background-color: #ffffff;
  color: var(--color-text);
  border-color: var(--color-border-subtle);
  box-shadow: var(--shadow-xs);
}

.button--secondary:hover {
  background-color: var(--color-surface-muted);
  color: var(--color-text);
}

.button--ghost {
  background-color: transparent;
  color: var(--color-text);
  border-color: transparent;
  box-shadow: none;
}

.button--ghost:hover {
  background-color: rgba(15, 23, 42, 0.04);
  color: var(--color-text);
}

/* Inputs - consistent across filters, search, checkout */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="tel"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-subtle);
  background-color: #ffffff;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    background-color var(--transition-base);
}

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

input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary-light);
}

input[disabled],
select[disabled],
textarea[disabled] {
  background-color: var(--color-gray-100);
  cursor: not-allowed;
}

/* Card - for product tiles, category highlights, info blocks */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(15, 23, 42, 0.04);
  box-shadow: var(--shadow-sm);
  padding: var(--space-8);
  transition:
    box-shadow var(--transition-base),
    transform var(--transition-base),
    border-color var(--transition-base);
}

.card--interactive:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: rgba(15, 23, 42, 0.08);
}

.card__header {
  margin-bottom: var(--space-4);
}

.card__body {
  margin-bottom: var(--space-4);
}

.card__footer {
  margin-top: auto;
}

/* Tag / badge - for availability, promotions, etc. */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.1rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.badge--success {
  background-color: rgba(16, 185, 129, 0.12);
  color: #047857;
}

.badge--warning {
  background-color: rgba(245, 158, 11, 0.12);
  color: #92400e;
}

.badge--danger {
  background-color: rgba(248, 113, 113, 0.12);
  color: #b91c1c;
}

/* Helper for subtle section backgrounds reminiscent of concrete */
.section-muted {
  background: linear-gradient(
    180deg,
    #f5f6f8 0%,
    #eef1f4 50%,
    #f5f6f8 100%
  );
}

/* Tables - for order summaries, comparison charts */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

thead {
  background-color: var(--color-gray-50);
}

thead th {
  text-align: left;
  padding: var(--space-4) var(--space-4);
  font-weight: 500;
  color: var(--color-text-soft);
}

tbody td {
  padding: var(--space-4) var(--space-4);
  border-top: 1px solid var(--color-gray-200);
}

/* Forms layout helper for checkout */
.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.form-col {
  flex: 1 1 220px;
}

label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.form-help {
  font-size: var(--font-size-xs);
  color: var(--color-text-soft);
  margin-top: var(--space-2);
}

.form-error {
  font-size: var(--font-size-xs);
  color: var(--color-danger);
  margin-top: var(--space-2);
}