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

:root {
  /* Colors */
  --color-background: #f5f7fa;
  --color-surface: #ffffff;
  --color-surface-muted: #f0f2f5;
  --color-text: #111827;
  --color-text-muted: #6b7280;
  --color-border-subtle: #e5e7eb;
  --color-border-strong: #d1d5db;

  --color-primary: #2563eb; /* refined blue */
  --color-primary-soft: #e0ecff;
  --color-primary-strong: #1d4ed8;

  --color-success: #16a34a;
  --color-warning: #f59e0b;
  --color-danger: #dc2626;

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

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", 
    "Segoe UI", Roboto, Helvetica, 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: 0.125rem;  /* 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-8: 1rem;      /* 16px */
  --space-10: 1.25rem;  /* 20px */
  --space-12: 1.5rem;   /* 24px */
  --space-16: 2rem;     /* 32px */
  --space-20: 2.5rem;   /* 40px */
  --space-24: 3rem;     /* 48px */
  --space-28: 3.5rem;   /* 56px */
  --space-32: 4rem;     /* 64px */
  --space-40: 5rem;     /* 80px */
  --space-48: 6rem;     /* 96px */

  /* Radius */
  --radius-xs: 0.125rem; /* 2px */
  --radius-sm: 0.25rem;  /* 4px */
  --radius-md: 0.5rem;   /* 8px */
  --radius-lg: 0.75rem;  /* 12px */
  --radius-xl: 1rem;     /* 16px */
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08),
               0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 6px rgba(15, 23, 42, 0.1),
               0 2px 4px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 10px 15px rgba(15, 23, 42, 0.12),
               0 4px 6px rgba(15, 23, 42, 0.08);

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

  /* Layout */
  --container-max-width: 1120px;
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

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

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

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

body {
  min-height: 100vh;
}

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

audio {
  max-width: 100%;
}

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

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

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

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

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

main {
  display: block;
}

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

h1 {
  font-size: clamp(2.25rem, 2.6vw, 2.75rem);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-16);
}

h2 {
  font-size: clamp(1.75rem, 2vw, 2rem);
  letter-spacing: -0.015em;
  margin-bottom: var(--space-12);
}

h3 {
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-10);
}

h4 {
  font-size: 1.25rem;
  margin-bottom: var(--space-8);
}

h5 {
  font-size: 1.125rem;
  margin-bottom: var(--space-6);
}

h6 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

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

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

a {
  color: var(--color-primary);
  text-decoration: none;
  text-underline-offset: 0.14em;
  transition: color var(--transition-normal);
}

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

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

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

hr {
  border: none;
  border-top: 1px solid var(--color-border-subtle);
  margin: var(--space-16) 0;
}

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

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

[tabindex="-1"]:focus {
  outline: none !important;
}

.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;
}

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

/* Layout containers */

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: var(--space-8);
}

@media (max-width: 375px) {
  .container {
    padding-inline: var(--space-4);
  }
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-16);
  }
}

.section {
  padding-block: var(--space-32);
}

.section--tight {
  padding-block: var(--space-24);
}

.section--spacious {
  padding-block: var(--space-40);
}

/* Flex helpers */

.flex {
  display: flex;
}

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

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

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

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

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

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

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

.gap-sm {
  gap: var(--space-6);
}

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

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

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

/* Grid helpers */

.grid {
  display: grid;
}

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

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

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

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

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

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

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

/* Width helpers */

.w-full {
  width: 100%;
}

.max-w-text {
  max-width: 68ch;
}

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

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

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

/* Spacing utilities (subset for common use) */

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

.mb-xs { margin-bottom: var(--space-4); }
.mb-sm { margin-bottom: var(--space-6); }
.mb-md { margin-bottom: var(--space-8); }
.mb-lg { margin-bottom: var(--space-12); }
.mb-xl { margin-bottom: var(--space-16); }

.pt-md { padding-top: var(--space-8); }
.pb-md { padding-bottom: var(--space-8); }

.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }

/* Color utilities */

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

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

.border-subtle {
  border: 1px solid var(--color-border-subtle);
}

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

/* Buttons */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding-inline: var(--space-12);
  padding-block: calc(var(--space-6) + 1px);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: none;
  border: 1px solid transparent;
  background-color: var(--color-primary);
  color: #ffffff;
  transition:
    background-color var(--transition-normal),
    color var(--transition-normal),
    box-shadow var(--transition-normal),
    transform var(--transition-fast),
    border-color var(--transition-normal);
}

.button:hover {
  background-color: var(--color-primary-strong);
  box-shadow: var(--shadow-sm);
  transform: translateY(-0.5px);
  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[disabled],
.button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  box-shadow: none;
  transform: none;
}

.button--ghost {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--color-border-subtle);
}

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

.button--secondary {
  background-color: #ffffff;
  color: var(--color-text);
  border-color: var(--color-border-subtle);
}

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

.button--sm {
  padding-inline: var(--space-8);
  padding-block: var(--space-4);
  font-size: var(--font-size-xs);
}

.button--lg {
  padding-inline: var(--space-16);
  padding-block: var(--space-8);
  font-size: var(--font-size-base);
}

/* Inputs */

.input,
select,
textarea {
  width: 100%;
  padding-inline: var(--space-8);
  padding-block: var(--space-6);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background-color: #ffffff;
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  transition:
    border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    background-color var(--transition-normal);
}

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

.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(--gray-100);
  cursor: not-allowed;
}

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

.field-help {
  margin-top: var(--space-4);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.field-error {
  margin-top: var(--space-4);
  font-size: var(--font-size-xs);
  color: var(--color-danger);
}

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

.card {
  position: relative;
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-subtle);
  padding: var(--space-16);
  box-shadow: var(--shadow-xs);
}

.card--interactive {
  cursor: pointer;
  transition:
    box-shadow var(--transition-normal),
    transform var(--transition-fast),
    border-color var(--transition-normal),
    background-color var(--transition-normal);
}

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

.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);
}

.card-footer {
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border-subtle);
}

/* Badges for status (e.g., order tracking) */

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding-inline: var(--space-6);
  padding-block: var(--space-2);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
  border: 1px solid transparent;
}

.badge--neutral {
  background-color: var(--gray-100);
  color: var(--gray-700);
  border-color: var(--gray-200);
}

.badge--success {
  background-color: rgba(22, 163, 74, 0.06);
  color: var(--color-success);
  border-color: rgba(22, 163, 74, 0.2);
}

.badge--warning {
  background-color: rgba(245, 158, 11, 0.06);
  color: var(--color-warning);
  border-color: rgba(245, 158, 11, 0.25);
}

.badge--danger {
  background-color: rgba(220, 38, 38, 0.06);
  color: var(--color-danger);
  border-color: rgba(220, 38, 38, 0.25);
}

/* Minimal top-level nav */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(245, 247, 250, 0.92);
  border-bottom: 1px solid rgba(209, 213, 219, 0.7);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.site-footer {
  border-top: 1px solid var(--color-border-subtle);
  background-color: #f3f4f6;
  padding-block: var(--space-20);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Product image emphasis */

.product-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: #0b1120;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Order status layout helpers */

.status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  font-size: var(--font-size-sm);
}

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

.status-row__value {
  font-weight: 500;
  color: var(--color-text);
}