:root {
  /* Color Palette */
  --color-bg: #050816; /* deep, techy blue-black */
  --color-surface: #0f172a; /* graphite navy */
  --color-surface-elevated: #111827; /* slightly lighter for cards */
  --color-text: #f9fafb; /* near white */
  --color-text-muted: #9ca3af; /* muted gray */
  --color-primary: #22c55e; /* electric green */
  --color-primary-soft: rgba(34, 197, 94, 0.12);
  --color-primary-strong: #16a34a;
  --color-accent: #9ca3af; /* metallic silver-gray */
  --color-border-subtle: #1f2937;
  --color-border-strong: #4b5563;
  --color-success: #22c55e;
  --color-warning: #facc15;
  --color-danger: #ef4444;
  --color-info: #38bdf8;
  --color-overlay: rgba(15, 23, 42, 0.8);

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", ui-monospace, 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 */
  --font-size-5xl: 3rem;     /* 48px */

  --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: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 18px;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-soft: 0 10px 30px rgba(15, 23, 42, 0.35);
  --shadow-medium: 0 18px 45px rgba(15, 23, 42, 0.55);
  --shadow-focus: 0 0 0 2px rgba(15, 23, 42, 0.9), 0 0 0 4px rgba(34, 197, 94, 0.7);

  /* Transitions & Motion */
  --transition-fast: 120ms ease-out;
  --transition-normal: 180ms ease-out;
  --transition-slow: 260ms ease;
  --transition-bezier-soft: cubic-bezier(0.22, 0.61, 0.36, 1);

  /* Layout */
  --container-max-width: 1200px;
  --container-wide-max-width: 1440px;
  --nav-height: 72px;
}

/*
  RESET / NORMALIZE
  ------------------------------------------------------------------
*/

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

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

body {
  margin: 0;
}

main {
  display: block;
}

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

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

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

img {
  height: auto;
}

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

button,
input,
select,
textarea {
  margin: 0;
  font: inherit;
  color: inherit;
  background: none;
  border-radius: 0;
}

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

textarea {
  resize: vertical;
}

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

legend {
  padding: 0;
}

:focus {
  outline: none;
}

[hidden] {
  display: none !important;
}

/*
  PREFERRED REDUCED MOTION
  ------------------------------------------------------------------
*/

@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;
  }
}

/*
  BASE STYLES
  ------------------------------------------------------------------
*/

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--font-size-md);
  line-height: var(--line-height-normal);
  background-color: var(--color-bg);
  color: var(--color-text);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.is-lock-scroll {
  overflow: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-text);
  line-height: var(--line-height-tight);
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(var(--font-size-3xl), 3.4vw, var(--font-size-5xl));
  margin-bottom: var(--space-4);
}

h2 {
  font-size: clamp(var(--font-size-2xl), 2.5vw, var(--font-size-4xl));
  margin-bottom: var(--space-3);
}

h3 {
  font-size: clamp(var(--font-size-xl), 1.9vw, var(--font-size-3xl));
  margin-bottom: var(--space-2);
}

h4 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-2);
}

h5 {
  font-size: var(--font-size-md);
  margin-bottom: var(--space-1);
}

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

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

strong {
  font-weight: 600;
  color: var(--color-text);
}

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

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

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

a:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
  border-radius: var(--radius-sm);
}

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

hr {
  border: 0;
  border-top: 1px solid var(--color-border-subtle);
  margin: var(--space-6) 0;
}

::selection {
  background-color: rgba(34, 197, 94, 0.28);
  color: var(--color-text);
}

/*
  ACCESSIBILITY
  ------------------------------------------------------------------
*/

:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

[role="button"] {
  cursor: pointer;
}

/* Visually hidden but accessible */
.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
  ------------------------------------------------------------------
*/

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

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

.section {
  padding-block: clamp(var(--space-10), 7vw, var(--space-16));
}

.section--tight {
  padding-block: clamp(var(--space-6), 5vw, var(--space-10));
}

/* 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-xs {
  gap: var(--space-2);
}

.gap-sm {
  gap: var(--space-3);
}

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

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

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

/* Grid utilities */

.grid {
  display: grid;
}

.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);
}

.grid-auto-fit {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-6);
}

@media (max-width: 767px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

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

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

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



.m-auto {
  margin: auto;
}

.mt-0 { margin-top: 0; }
.mt-xs { margin-top: var(--space-2); }
.mt-sm { margin-top: var(--space-3); }
.mt-md { margin-top: var(--space-4); }
.mt-lg { margin-top: var(--space-6); }
.mt-xl { margin-top: var(--space-8); }

.mb-0 { margin-bottom: 0; }
.mb-xs { margin-bottom: var(--space-2); }
.mb-sm { margin-bottom: var(--space-3); }
.mb-md { margin-bottom: var(--space-4); }
.mb-lg { margin-bottom: var(--space-6); }
.mb-xl { margin-bottom: var(--space-8); }

.pt-0 { padding-top: 0; }
.pt-sm { padding-top: var(--space-3); }
.pt-md { padding-top: var(--space-4); }
.pt-lg { padding-top: var(--space-6); }

.pb-0 { padding-bottom: 0; }
.pb-sm { padding-bottom: var(--space-3); }
.pb-md { padding-bottom: var(--space-4); }
.pb-lg { padding-bottom: var(--space-6); }

/* Elevation + surfaces */

.surface {
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.08), transparent 55%),
              radial-gradient(circle at bottom right, rgba(34, 197, 94, 0.09), transparent 55%),
              var(--color-surface);
}

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

/*
  COMPONENTS
  ------------------------------------------------------------------
*/

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: var(--radius-pill);
  padding: 0.7rem 1.4rem;
  font-size: var(--font-size-sm);
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  border: 1px solid transparent;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-strong) 50%, #22c55e 100%);
  color: #02100a!important;
  box-shadow: 0 10px 25px rgba(22, 163, 74, 0.45);
  transition:
    background var(--transition-normal) var(--transition-bezier-soft),
    box-shadow var(--transition-normal) var(--transition-bezier-soft),
    transform var(--transition-fast) var(--transition-bezier-soft),
    border-color var(--transition-fast) var(--transition-bezier-soft),
    color var(--transition-fast) var(--transition-bezier-soft);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 35px rgba(22, 163, 74, 0.6);
}

.btn:active {
  transform: translateY(0);
  box-shadow: 0 6px 18px rgba(22, 163, 74, 0.4);
}

.btn:focus-visible {
  box-shadow: var(--shadow-focus);
}

.btn--ghost {
  background: rgba(15, 23, 42, 0.8);
  color: var(--color-text)!important;
  border-color: var(--color-border-strong);
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.7);
}

.btn--ghost:hover {
  background: rgba(15, 23, 42, 0.95);
  border-color: var(--color-primary);
}

.btn--outline {
  background: transparent;
  color: var(--color-primary)!important;
  border-color: rgba(148, 163, 184, 0.9);
  box-shadow: none;
}

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

.btn--subtle {
  background: rgba(15, 23, 42, 0.75);
  border-color: rgba(148, 163, 184, 0.4);
  color: var(--color-text)!important;
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.85);
}

.btn--subtle:hover {
  border-color: var(--color-primary);
}

.btn--danger {
  background: linear-gradient(135deg, #ef4444, #b91c1c);
  color: #fff!important;
  box-shadow: 0 12px 26px rgba(248, 113, 113, 0.6);
}

.btn--full {
  width: 100%;
}

.btn[disabled],
.btn:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  box-shadow: none;
  transform: none;
}

/* Inputs, selects, textareas */

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.field__label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
}

.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,
.select,
.textarea {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  padding: 0.7rem 0.9rem;
  font-size: var(--font-size-sm);
  background: radial-gradient(circle at top left, rgba(148, 163, 184, 0.18), transparent 55%),
              rgba(15, 23, 42, 0.95);
  color: var(--color-text);
  box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.85);
  transition:
    border-color var(--transition-fast) var(--transition-bezier-soft),
    box-shadow var(--transition-fast) var(--transition-bezier-soft),
    background var(--transition-slow) var(--transition-bezier-soft);
}

.input::placeholder,
.textarea::placeholder {
  color: rgba(148, 163, 184, 0.8);
}

.input:focus-visible,
.select:focus-visible,
.textarea:focus-visible {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.9), 0 0 0 2px rgba(34, 197, 94, 0.9);
  outline: none;
}

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

select.select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--color-text-muted) 50%),
                    linear-gradient(135deg, var(--color-text-muted) 50%, transparent 50%);
  background-position: calc(100% - 14px) 52%, calc(100% - 9px) 52%;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
}

/* Card component */

.card {
  position: relative;
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.12), transparent 55%),
              radial-gradient(circle at bottom right, rgba(34, 197, 94, 0.12), transparent 55%),
              linear-gradient(145deg, rgba(15, 23, 42, 0.98), rgba(15, 23, 42, 0.98));
  border: 1px solid rgba(148, 163, 184, 0.28);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(148, 163, 184, 0.16), transparent 60%);
  opacity: 0.5;
  pointer-events: none;
}

.card__header,
.card__body,
.card__footer {
  position: relative;
  z-index: 1;
}

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

.card__title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-1);
}

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

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

.card--interactive:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-medium);
  border-color: rgba(34, 197, 94, 0.7);
}

.card--interactive:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

/* Tag / pill (for technical specs, filters) */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.45);
  background: rgba(15, 23, 42, 0.9);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tag--primary {
  border-color: rgba(34, 197, 94, 0.9);
  color: var(--color-primary);
  background: rgba(15, 23, 42, 0.95);
}

.tag--success {
  border-color: rgba(34, 197, 94, 0.9);
  color: var(--color-success);
}

.tag--danger {
  border-color: rgba(248, 113, 113, 0.9);
  color: var(--color-danger);
}

/* Helper for subtle technical detail lists */

.spec-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-3);
}

.spec-list__item {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.spec-list__label {
  display: block;
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(148, 163, 184, 0.9);
}

.spec-list__value {
  font-weight: 500;
  color: var(--color-text);
}

/* Overlays (for modals / live chat etc.) */

.overlay {
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 40;
}

.overlay__panel {
  max-width: 480px;
  width: 100%;
  margin: var(--space-4);
}

/* Toast / status message */

.toast {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(148, 163, 184, 0.5);
  color: var(--color-text);
}

.toast--success {
  border-color: rgba(34, 197, 94, 0.9);
}

.toast--danger {
  border-color: rgba(248, 113, 113, 0.9);
}

.toast--info {
  border-color: rgba(56, 189, 248, 0.9);
}

/* Badge for cart count, notifications */

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.25rem;
  padding: 0 0.3rem;
  border-radius: var(--radius-pill);
  background-color: var(--color-danger);
  color: #fff;
  font-size: var(--font-size-xs);
  font-weight: 600;
}

/* Status dots (online support, in stock) */

.status-dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 999px;
  background-color: var(--color-text-muted);
}

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

.status-dot--warning {
  background-color: var(--color-warning);
}

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

/*
  END OF BASE
  ------------------------------------------------------------------
*/