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

:root {
  /* Colors */
  --color-background: #060709; /* deep graphite */
  --color-background-elevated: #0e1116;
  --color-surface: #151921;
  --color-surface-soft: #1d222c;

  --color-text: #f7f7f9;
  --color-text-muted: #a3acbc;
  --color-text-soft: #7b8493;

  --color-primary: #2f7df6; /* electric blue */
  --color-primary-soft: rgba(47, 125, 246, 0.16);
  --color-primary-strong: #1d5fcc;

  --color-success: #26c281; /* subtle green accent */
  --color-success-soft: rgba(38, 194, 129, 0.14);

  --color-warning: #f5a623;
  --color-warning-soft: rgba(245, 166, 35, 0.16);

  --color-danger: #ff4d4f;
  --color-danger-soft: rgba(255, 77, 79, 0.16);

  --color-border-subtle: #242a35;
  --color-border-strong: #333b49;

  --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,
    Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue",
    Arial, 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: 6px;
  --radius-lg: 10px;
  --radius-xl: 16px;
  --radius-full: 999px;

  /* Shadows (subtle, to fit dark UI) */
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.45);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 18px 45px rgba(0, 0, 0, 0.65);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-base: 180ms ease-out;
  --transition-slow: 260ms ease-out;
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0s;
    --transition-base: 0s;
    --transition-slow: 0s;
  }

  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

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

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

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

html {
  -webkit-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,
video {
  height: auto;
}

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

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

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

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

fieldset {
  margin: 0;
  padding: 0;
  border: 0;
}

textarea {
  resize: vertical;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

[hidden] {
  display: none !important;
}

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

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

/* Headings: modern tech scale, controlled margins */

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: -0.03em;
  margin-bottom: var(--space-16);
}

h2 {
  font-size: clamp(1.75rem, 2.1vw, 2.125rem);
  letter-spacing: -0.02em;
  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: 0.95rem;
  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-muted);
}

p.lead {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--color-text);
}

/* Links */

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

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

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

/* Code */

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

/* ========================================================================== 
   Accessibility & Focus
   ========================================================================== */

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

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

/* 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;
}

.sr-only-focusable:focus,
.sr-only-focusable:active {
  position: static;
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

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

/* Layout containers */

.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;
  }
}

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

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

/* Flex helpers */

.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;
}

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

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

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

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

/* Grid helpers */

.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-16);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-16);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-16);
}

@media (max-width: 960px) {
  .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: minmax(0, 1fr);
  }
}

/* Spacing utilities (margin + padding, selection) */

.mt-0 { margin-top: 0 !important; }
.mt-4 { margin-top: var(--space-4) !important; }
.mt-8 { margin-top: var(--space-8) !important; }
.mt-12 { margin-top: var(--space-12) !important; }
.mt-16 { margin-top: var(--space-16) !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-4 { margin-bottom: var(--space-4) !important; }
.mb-8 { margin-bottom: var(--space-8) !important; }
.mb-12 { margin-bottom: var(--space-12) !important; }
.mb-16 { margin-bottom: var(--space-16) !important; }

.p-8 { padding: var(--space-8) !important; }
.p-12 { padding: var(--space-12) !important; }
.p-16 { padding: var(--space-16) !important; }

/* Text utilities */

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

.text-soft {
  color: var(--color-text-soft) !important;
}

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

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

.text-uppercase {
  text-transform: uppercase !important;
}

/* Surface utilities for dark tech look */

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

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

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

.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); }

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

/* Buttons */

.button,
button,
input[type="button"],
input[type="submit"],
input[type="reset"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-size: var(--font-size-sm);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  background-color: var(--color-primary);
  color: #ffffff!important;
  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,
button:hover,
input[type="button"]:hover,
input[type="submit"]:hover,
input[type="reset"]:hover {
  background-color: var(--color-primary-strong);
  box-shadow: 0 0 0 1px rgba(47, 125, 246, 0.4), var(--shadow-sm);
  transform: translateY(-1px);
}

.button:active,
button:active,
input[type="button"]:active,
input[type="submit"]:active,
input[type="reset"]:active {
  transform: translateY(0);
  box-shadow: none;
}

.button:focus-visible,
button:focus-visible,
input[type="button"]:focus-visible,
input[type="submit"]:focus-visible,
input[type="reset"]:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

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

.button--ghost:hover {
  background-color: rgba(255, 255, 255, 0.03);
  border-color: var(--color-primary);
}

.button--secondary {
  background-color: var(--color-surface-soft);
  border-color: var(--color-border-subtle);
  color: var(--color-text)!important;
}

.button--secondary:hover {
  background-color: var(--color-surface);
  border-color: var(--color-primary);
}

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

.button--danger:hover {
  background-color: #e63c3e;
}

.button[disabled],
button[disabled],
input[type="button"][disabled],
input[type="submit"][disabled],
input[type="reset"][disabled],
.button.is-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

/* Form Inputs */

input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="number"],
input[type="tel"],
select,
textarea {
  width: 100%;
  padding: 0.55rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background-color: var(--color-surface);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  transition: border-color var(--transition-base),
    background-color var(--transition-base),
    box-shadow var(--transition-base);
}

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

input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px rgba(47, 125, 246, 0.65);
}

input[disabled],
select[disabled],
textarea[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Search input variant for header / product search */

.input--search {
  padding-right: 2.4rem; /* space for icon */
  background-color: var(--color-surface-soft);
}

/* Cards (for products, reviews, etc.) */

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

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

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

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

.card-title {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-snug);
  margin-bottom: var(--space-4);
}

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

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

/* Product-specific small utilities */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.1rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border: 1px solid transparent;
}

.badge--success {
  background-color: var(--color-success-soft);
  color: var(--color-success);
  border-color: rgba(38, 194, 129, 0.5);
}

.badge--warning {
  background-color: var(--color-warning-soft);
  color: var(--color-warning);
  border-color: rgba(245, 166, 35, 0.5);
}

.badge--danger {
  background-color: var(--color-danger-soft);
  color: var(--color-danger);
  border-color: rgba(255, 77, 79, 0.5);
}

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

.price--muted {
  font-size: var(--font-size-sm);
  color: var(--color-text-soft);
  text-decoration: line-through;
}

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

/* ========================================================================== 
   End of base.css
   ========================================================================== */