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

:root {
  /* Colors */
  --color-background: #f5f7fa;
  --color-surface: #ffffff;
  --color-surface-muted: #eef1f5;
  --color-text: #131720;
  --color-text-muted: #5b6270;
  --color-border-subtle: #d6dde8;
  --color-border-strong: #a7b3c7;

  --color-primary: #2b5f9e; /* steel blue */
  --color-primary-soft: #e0ebf8;
  --color-primary-strong: #1c4473;

  --color-success: #2f8f4e; /* subtle green highlight */
  --color-success-soft: #e0f3e7;

  --color-warning: #c98a1a;
  --color-warning-soft: #fff3d6;

  --color-danger: #c53b3b;
  --color-danger-soft: #ffe1e1;

  /* Neutral grays */
  --gray-50: #f8fafc;
  --gray-100: #eef2f7;
  --gray-200: #e0e5ee;
  --gray-300: #cfd6e3;
  --gray-400: #a7b0c2;
  --gray-500: #7c8597;
  --gray-600: #5b6270;
  --gray-700: #3a404c;
  --gray-800: #21252f;
  --gray-900: #141821;

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

  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem;  /* 14px */
  --font-size-md: 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 (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: 2px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 18px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-subtle: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-soft: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-medium: 0 10px 30px rgba(15, 23, 42, 0.12);

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

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

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

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

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

body {
  min-height: 100vh;
}

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

img {
  border-style: none;
  display: block;
}

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

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

ul,
ol {
  margin: 0;
  padding: 0;
}

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

/* Remove default link underlines, handled in base styles */
a {
  text-decoration: none;
  color: inherit;
}

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

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

main {
  display: block;
}

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

h1 {
  font-size: clamp(2rem, 3vw, var(--font-size-4xl));
  margin-bottom: var(--space-16);
}

h2 {
  font-size: clamp(1.5rem, 2.2vw, var(--font-size-3xl));
  margin-bottom: var(--space-12);
}

h3 {
  font-size: clamp(1.25rem, 1.8vw, var(--font-size-2xl));
  margin-bottom: var(--space-10);
}

h4 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-8);
}

h5 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-6);
}

h6 {
  font-size: var(--font-size-md);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

p {
  margin-bottom: var(--space-8);
  color: var(--color-text-muted);
  line-height: var(--line-height-relaxed);
  }

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

strong {
  font-weight: 600;
}

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

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

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

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

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

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

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

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

:focus:not(:focus-visible) {
  outline: none;
}

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

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

/* Layout: Container */

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

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

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

/* 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-8 {
  gap: var(--space-8);
}

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

@media (max-width: 900px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 600px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Screen reader only */

.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;
}

/* Width helpers */

.w-full {
  width: 100%;
}

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

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-size: var(--font-size-sm);
  font-weight: 500;
  line-height: 1.1;
  background-color: var(--color-primary);
  color: #ffffff!important;
  box-shadow: var(--shadow-subtle);
  transition: background-color var(--transition-normal),
    box-shadow var(--transition-fast),
    transform var(--transition-fast),
    border-color var(--transition-fast);
}

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

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

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

.btn--ghost {
  background-color: transparent;
  color: var(--color-primary)!important;
  border-color: var(--color-border-subtle);
  box-shadow: none;
}

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

.btn--secondary {
  background-color: var(--gray-900);
  color: #ffffff!important;
}

.btn--secondary:hover {
  background-color: var(--gray-800);
}

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

.btn--success:hover {
  background-color: #256f3b;
}

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

/* Form elements */

.input,
select,
textarea {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-subtle);
  background-color: var(--color-surface);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: 1.4;
  transition: border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    background-color var(--transition-fast);
}

.input::placeholder,
textarea::placeholder {
  color: var(--gray-500);
}

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

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

label {
  display: inline-block;
  margin-bottom: var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--gray-700);
}

.input-group {
  margin-bottom: var(--space-12);
}

/* Card component (for product tiles, info blocks) */

.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-subtle);
  box-shadow: var(--shadow-subtle);
  padding: var(--space-12);
  transition: box-shadow var(--transition-normal),
    transform var(--transition-normal),
    border-color var(--transition-normal),
    background-color var(--transition-normal);
}

.card--interactive {
  cursor: pointer;
}

.card--interactive:hover {
  box-shadow: var(--shadow-medium);
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
}

.card-header {
  margin-bottom: var(--space-8);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-8);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--gray-900);
}

.card-subtitle {
  font-size: var(--font-size-sm);
  color: var(--gray-600);
}

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

.card-footer {
  margin-top: var(--space-10);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-8);
}

/* Badge (for promotions, availability) */

.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;
  text-transform: uppercase;
}

.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);
}

/* Simple tag for specs / filters */

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  background-color: var(--color-surface-muted);
  color: var(--gray-700);
  font-size: var(--font-size-xs);
}

/* Tables for technical specifications */

.table-specs {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.table-specs tr:nth-child(even) {
  background-color: var(--gray-50);
}

.table-specs th,
.table-specs td {
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--gray-100);
}

.table-specs th {
  text-align: left;
  font-weight: 500;
  color: var(--gray-700);
  width: 34%;
}

.table-specs td {
  color: var(--gray-800);
}

/* Messages (info, success, warning, error) */

.alert {
  padding: var(--space-8) var(--space-10);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  display: flex;
  align-items: flex-start;
  gap: var(--space-8);
  border: 1px solid transparent;
}

.alert--success {
  background-color: var(--color-success-soft);
  border-color: rgba(47, 143, 78, 0.35);
  color: var(--color-success);
}

.alert--warning {
  background-color: var(--color-warning-soft);
  border-color: rgba(201, 138, 26, 0.35);
  color: var(--color-warning);
}

.alert--danger {
  background-color: var(--color-danger-soft);
  border-color: rgba(197, 59, 59, 0.35);
  color: var(--color-danger);
}

.alert--info {
  background-color: var(--color-primary-soft);
  border-color: rgba(43, 95, 158, 0.35);
  color: var(--color-primary-strong);
}

/* Breadcrumbs for structured navigation */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--font-size-xs);
  color: var(--gray-600);
}

.breadcrumb a {
  color: var(--gray-600);
}

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

.breadcrumb-separator {
  color: var(--gray-500);
}

/* Price emphasis */

.price {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--gray-900);
}

.price--old {
  font-size: var(--font-size-sm);
  color: var(--gray-500);
  text-decoration: line-through;
}

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

/* Rating (stars) */

.rating {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--font-size-xs);
  color: var(--gray-600);
}

.rating-stars {
  display: inline-flex;
  color: #f5a623;
}

/* Simple section spacing helpers */

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

.section--muted {
  background-color: var(--gray-50);
}

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



/* End of base.css */