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

:root {
  /* Colors */
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;

  --color-text: #111827; /* near-black for readability */
  --color-text-muted: #6b7280; /* gray-500 */
  --color-border-subtle: #e5e7eb; /* gray-200 */

  --color-primary: #0ea5e9; /* energetic, modern accent (light blue) */
  --color-primary-soft: #e0f2fe;
  --color-primary-strong: #0369a1;

  --color-success: #16a34a;
  --color-success-soft: #dcfce7;

  --color-warning: #f59e0b;
  --color-warning-soft: #fef3c7;

  --color-danger: #dc2626;
  --color-danger-soft: #fee2e2;

  --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;
  --font-serif: "Merriweather", "Georgia", serif;
  --font-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-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* Spacing scale (px) */
  --space-0: 0;
  --space-1: 2px;
  --space-2: 4px;
  --space-3: 6px;
  --space-4: 8px;
  --space-5: 10px;
  --space-6: 12px;
  --space-8: 16px;
  --space-10: 20px;
  --space-12: 24px;
  --space-16: 32px;
  --space-20: 40px;
  --space-24: 48px;
  --space-32: 64px;
  --space-40: 80px;
  --space-48: 96px;

  /* Radius */
  --radius-xs: 3px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows (subtle, to keep it minimalist) */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 6px 18px rgba(15, 23, 42, 0.10);

  /* Transitions */
  --duration-fast: 120ms;
  --duration-normal: 180ms;
  --duration-slow: 250ms;
  --easing-standard: cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

html,
body {
  margin: 0;
  padding: 0;
}

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

ul,
ol {
  padding-left: 1.25rem;
}

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

body {
  min-height: 100vh;
}

img,
svg,
video,
canvas,
audio,
iframe,
embed,
object {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

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

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

input,
textarea,
select {
  margin: 0;
}

/* Ensure focus styles are visible for keyboard users */
:focus {
  outline: none;
}

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

/* Respect user preference for reduced motion */
@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;
  }
}

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

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

main {
  min-height: 60vh;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-gray-900);
  margin-bottom: var(--space-8);
}

h1 {
  font-size: clamp(2rem, 2.4vw, 2.5rem);
}

h2 {
  font-size: clamp(1.75rem, 2vw, 2.125rem);
}

h3 {
  font-size: clamp(1.5rem, 1.7vw, 1.875rem);
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--space-8);
  color: var(--color-text);
}

p.small,
.small-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

a {
  color: var(--color-primary-strong);
  text-decoration: none;
  transition: color var(--duration-normal) var(--easing-standard);
}

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

a:focus-visible {
  outline-color: var(--color-primary);
}

::selection {
  background-color: var(--color-primary-soft);
  color: var(--color-gray-900);
}

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

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

/* Layout containers */

.container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-16);
  padding-right: var(--space-16);
  max-width: 1180px; /* comfortable width for product grids & content */
}

.container-wide {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-16);
  padding-right: var(--space-16);
  max-width: 1440px;
}

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

@media (min-width: 768px) {
  .section {
    padding-top: var(--space-32);
    padding-bottom: var(--space-32);
  }
}

/* Flex utilities */

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

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

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

/* Grid utilities */

.grid {
  display: grid;
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

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

@media (max-width: 1024px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* Spacing utilities (commonly used) */

.m-0 { margin: 0; }
.mt-8 { margin-top: var(--space-8); }
.mt-16 { margin-top: var(--space-16); }
.mt-24 { margin-top: var(--space-24); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-16 { margin-bottom: var(--space-16); }
.mb-24 { margin-bottom: var(--space-24); }

.p-8 { padding: var(--space-8); }
.p-16 { padding: var(--space-16); }
.px-16 {
  padding-left: var(--space-16);
  padding-right: var(--space-16);
}

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

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

/* Visually hidden but accessible (screen readers) */

.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;
}

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

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border: 1px solid transparent;
  background-color: var(--color-primary);
  color: #ffffff;
  text-decoration: none;
  transition:
    background-color var(--duration-normal) var(--easing-standard),
    color var(--duration-normal) var(--easing-standard),
    box-shadow var(--duration-normal) var(--easing-standard),
    transform var(--duration-fast) var(--easing-standard),
    border-color var(--duration-normal) var(--easing-standard);
  box-shadow: var(--shadow-sm);
}

.btn:hover {
  background-color: var(--color-primary-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-xs);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.6;
  box-shadow: none;
}

.btn-secondary {
  background-color: #ffffff;
  color: var(--color-gray-900);
  border-color: var(--color-border-subtle);
  box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
  background-color: var(--color-gray-50);
  border-color: var(--color-gray-300);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary-strong);
  border-color: var(--color-primary);
  box-shadow: none;
}

.btn-outline:hover {
  background-color: var(--color-primary-soft);
}

/* Inputs & form controls */

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}

.field-label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-gray-800);
}

.field-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.field-error {
  font-size: var(--font-size-xs);
  color: var(--color-danger);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="number"],
select,
textarea {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background-color: #ffffff;
  padding: 0.55rem 0.7rem;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  transition:
    border-color var(--duration-normal) var(--easing-standard),
    box-shadow var(--duration-normal) var(--easing-standard),
    background-color var(--duration-normal) var(--easing-standard);
}

input::placeholder,
textarea::placeholder {
  color: var(--color-gray-400);
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary-soft);
}

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

/* Cards (for product tiles, info blocks, etc.) */

.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(15, 23, 42, 0.03);
  box-shadow: var(--shadow-xs);
  padding: var(--space-16);
  transition:
    box-shadow var(--duration-normal) var(--easing-standard),
    transform var(--duration-normal) var(--easing-standard),
    border-color var(--duration-normal) var(--easing-standard);
}

.card-hover:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(15, 23, 42, 0.06);
  transform: translateY(-2px);
}

.card-header {
  margin-bottom: var(--space-8);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.card-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

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

/* Badges (e.g., energy class, promo) */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.badge-success {
  background-color: var(--color-success-soft);
  color: var(--color-success);
}

.badge-warning {
  background-color: var(--color-warning-soft);
  color: var(--color-warning);
}

.badge-danger {
  background-color: var(--color-danger-soft);
  color: var(--color-danger);
}

/* Rating (for user reviews) */

.rating {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--font-size-sm);
}

.rating-stars {
  display: inline-flex;
  gap: 2px;
  color: #facc15; /* warm yellow for stars */
}

.rating-count {
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
}

/* Helper for energy efficiency / technical labels list */

.definition-list {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: var(--space-4) var(--space-16);
  font-size: var(--font-size-sm);
}

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

.definition-list dd {
  margin: 0;
  text-align: right;
}

@media (max-width: 640px) {
  .definition-list {
    grid-template-columns: 1fr;
  }

  .definition-list dd {
    text-align: left;
  }
}

/* Alerts (for trust & clarity: info, warnings, etc.) */

.alert {
  border-radius: var(--radius-md);
  padding: var(--space-10) var(--space-12);
  font-size: var(--font-size-sm);
  display: flex;
  gap: var(--space-8);
  align-items: flex-start;
}

.alert-info {
  background-color: var(--color-primary-soft);
  color: var(--color-gray-900);
}

.alert-success {
  background-color: var(--color-success-soft);
  color: var(--color-gray-900);
}

.alert-warning {
  background-color: var(--color-warning-soft);
  color: var(--color-gray-900);
}

.alert-danger {
  background-color: var(--color-danger-soft);
  color: var(--color-gray-900);
}

/* Small tag for trust labels (e.g., gwarancja, darmowa dostawa) */

.trust-labels {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.trust-labels span {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
}

/* End of base.css */