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

:root {
  /* Color palette – refined blue, silver, white, neutrals */
  --color-background: #f5f7fa;
  --color-surface: #ffffff;
  --color-text: #1b2733;
  --color-text-muted: #6b7280;

  --color-primary: #0f57c8;      /* main corporate blue */
  --color-primary-soft: #e3edff; /* light blue background */
  --color-primary-dark: #0a3e8e;

  --color-success: #0f9d58;
  --color-warning: #f6a609;
  --color-danger:  #d93025;

  /* Neutral grays / silver */
  --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;

  --color-border-subtle: var(--color-gray-200);
  --color-border-strong: var(--color-gray-300);

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", 
    Roboto, "Helvetica Neue", Arial, sans-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 (0–96px) */
  --space-0: 0;
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */
  --space-20: 5rem;    /* 80px */
  --space-24: 6rem;    /* 96px */

  /* Radius */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --radius-pill: 999px;

  /* Shadows – subtle, professional */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-base: 180ms ease-out;
  --transition-slow: 240ms ease-out;

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

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

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

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

body {
  margin: 0;
}

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

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

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

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

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

a {
  color: inherit;
  text-decoration: none;
}

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

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 {
  min-height: 60vh;
}

/* Headings – clear hierarchy for professional look */

h1, .h1 {
  font-size: clamp(2rem, 2.4vw, var(--font-size-4xl));
  line-height: var(--line-height-tight);
  font-weight: 600;
  letter-spacing: -0.02em;
}

h2, .h2 {
  font-size: clamp(1.5rem, 2vw, var(--font-size-3xl));
  line-height: var(--line-height-tight);
  font-weight: 600;
  letter-spacing: -0.01em;
}

h3, .h3 {
  font-size: clamp(1.25rem, 1.4vw, var(--font-size-2xl));
  line-height: var(--line-height-tight);
  font-weight: 600;
}

h4, .h4 {
  font-size: var(--font-size-xl);
  line-height: var(--line-height-normal);
  font-weight: 500;
}

h5, .h5 {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-normal);
  font-weight: 500;
}

h6, .h6 {
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

h1, h2, h3, h4, h5, h6 {
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

p {
  margin-bottom: var(--space-3);
  }

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

strong {
  font-weight: 600;
}

/* Links – subtle but clear */

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

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

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

/* Lists */

ul, ol {
  padding-left: 1.2rem;
  margin-bottom: var(--space-3);
}

li + li {
  margin-top: 0.25rem;
}

/* Horizontal rules */

hr {
  border: none;
  border-top: 1px solid var(--color-border-subtle);
  margin: var(--space-6) 0;
}

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

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

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

/* 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;
}

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

/* Layout */

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.section {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}

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

/* 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-column {
  display: flex;
  flex-direction: column;
}

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

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

/* Grid helpers */

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

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

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

/* Spacing utilities – minimal selection for layout tweaks */

.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.mt-4 { margin-top: var(--space-4) !important; }
.mt-6 { margin-top: var(--space-6) !important; }
.mb-4 { margin-bottom: var(--space-4) !important; }
.mb-6 { margin-bottom: var(--space-6) !important; }

.pt-4 { padding-top: var(--space-4) !important; }
.pb-4 { padding-bottom: var(--space-4) !important; }

.text-center { text-align: center !important; }
.text-right { text-align: right !important; }
.text-muted { color: var(--color-text-muted) !important; }

/* Width helpers */

.w-100 { width: 100%; }

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

/* Buttons – primary actions for checkout & CTAs */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-weight: 500;
  font-size: var(--font-size-sm);
  line-height: 1.2;
  cursor: pointer;
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: var(--shadow-xs);
  transition:
    background-color var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-fast),
    color var(--transition-base);
}

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

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

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

.button--secondary {
  background-color: #ffffff;
  color: var(--color-text);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-xs);
}

.button--secondary:hover {
  background-color: var(--color-gray-50);
  color: var(--color-text);
}

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

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

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

.button--danger:hover {
  background-color: #b3241c;
}

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

/* Inputs – for filters, search, checkout forms */

.input,
select,
textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-strong);
  background-color: #ffffff;
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    background-color var(--transition-base);
}

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

.input:focus,
select:focus,
textarea:focus {
  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;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

label {
  display: inline-block;
  margin-bottom: 0.25rem;
  font-size: var(--font-size-sm);
  font-weight: 500;
}

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

.form-helper {
  margin-top: 0.25rem;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.form-error {
  margin-top: 0.25rem;
  font-size: var(--font-size-xs);
  color: var(--color-danger);
}

/* Card – for product tiles, info blocks, reviews */

.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-subtle);
  box-shadow: var(--shadow-xs);
  padding: var(--space-4);
}

.card--hoverable {
  transition:
    box-shadow var(--transition-base),
    transform var(--transition-base),
    border-color var(--transition-base);
}

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

.card-header {
  margin-bottom: var(--space-3);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

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

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

.card-footer {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border-subtle);
}

/* Badges – for availability, discounts, B2B labels */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-pill);
  font-size: var(--font-size-xs);
  font-weight: 500;
  line-height: 1.2;
}

.badge--success {
  background-color: rgba(15, 157, 88, 0.08);
  color: var(--color-success);
}

.badge--warning {
  background-color: rgba(246, 166, 9, 0.08);
  color: var(--color-warning);
}

.badge--neutral {
  background-color: var(--color-gray-100);
  color: var(--color-text-muted);
}

/* Tables – for order overviews, invoices */

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

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

.table th,
.table td {
  padding: 0.75rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border-subtle);
}

.table th {
  font-weight: 600;
  color: var(--color-text-muted);
}

.table--compact th,
.table--compact td {
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

/* Alerts – for checkout & account messages */

.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  border: 1px solid transparent;
}

.alert--info {
  background-color: var(--color-primary-soft);
  border-color: rgba(15, 87, 200, 0.2);
  color: var(--color-primary-dark);
}

.alert--success {
  background-color: rgba(15, 157, 88, 0.06);
  border-color: rgba(15, 157, 88, 0.2);
  color: var(--color-success);
}

.alert--warning {
  background-color: rgba(246, 166, 9, 0.06);
  border-color: rgba(246, 166, 9, 0.2);
  color: var(--color-warning);
}

.alert--danger {
  background-color: rgba(217, 48, 37, 0.06);
  border-color: rgba(217, 48, 37, 0.2);
  color: var(--color-danger);
}

/* Breadcrumbs – for clear navigation in catalog */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

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

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

.breadcrumb-separator {
  margin: 0 0.25rem;
  color: var(--color-gray-400);
}

/* Chips – for filters, tags */

.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-subtle);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  background-color: #ffffff;
}

.chip--active {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
}

/* Pagination – for product listing pages */

.pagination {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: var(--font-size-sm);
}

.pagination button,
.pagination a {
  min-width: 2rem;
  height: 2rem;
  padding: 0 0.5rem;
  border-radius: var(--radius-pill);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  background-color: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition:
    background-color var(--transition-base),
    border-color var(--transition-base),
    color var(--transition-base);
}

.pagination a:hover,
.pagination button:hover {
  background-color: var(--color-gray-100);
}

.pagination .is-active {
  border-color: var(--color-primary);
  background-color: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

/* End of base.css */