:root {
  /* Color Palette */
  --color-bg: #050816; /* deep sport background */
  --color-surface: #0b1020;
  --color-surface-alt: #0f172a;
  --color-text: #f9fafb;
  --color-text-muted: #9ca3af;

  --color-primary: #2563eb; /* bold blue */
  --color-primary-soft: rgba(37, 99, 235, 0.12);
  --color-primary-strong: #1d4ed8;

  --color-accent: #22c55e; /* fresh green */
  --color-accent-soft: rgba(34, 197, 94, 0.15);

  --color-success: #16a34a;
  --color-warning: #facc15;
  --color-danger: #ef4444;

  --color-border-subtle: #1f2937;
  --color-border-strong: #374151;

  /* Neutral Grays */
  --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, 'Inter', 'Roboto', 'Segoe UI', sans-serif;
  --font-heading: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 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 (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-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 (sporty, elevated UI) */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.4);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.55);
  --shadow-lg: 0 18px 40px rgba(15, 23, 42, 0.75);

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

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

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

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

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

body {
  min-height: 100vh;
}

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

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

button,
[role='button'] {
  cursor: pointer;
}

button:disabled,
[role='button'][aria-disabled='true'],
button[disabled] {
  cursor: not-allowed;
}

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

/* Remove built-in padding */
ul,
ol {
  padding: 0;
}

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

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

/* --------------------------------------------------
   Base Styles
-------------------------------------------------- */
body {
  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);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 {
  font-size: clamp(2.25rem, 3vw, 3rem);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
}

h2 {
  font-size: clamp(1.875rem, 2.4vw, 2.5rem);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}

h3 {
  font-size: clamp(1.5rem, 2vw, 2rem);
  margin-bottom: var(--space-2);
}

h4 {
  font-size: 1.25rem;
}

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

strong,
b {
  font-weight: 600;
}

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

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

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

a:active {
  transform: translateY(1px);
}

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

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

/* --------------------------------------------------
   Accessibility & Focus Styles
-------------------------------------------------- */
:focus {
  outline: none;
}

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

/* Screen reader only utility */
.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%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
  max-width: 1200px;
}

@media (min-width: 1280px) {
  .container {
    max-width: 1320px;
  }
}

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

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

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

.justify-center {
  justify-content: center;
}

.gap-2 {
  gap: var(--space-2);
}

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

/* Grid helpers */
.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

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

/* Layout spacing helpers (limited, generic) */
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.pt-4 { padding-top: var(--space-4); }
.pb-4 { padding-bottom: var(--space-4); }

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

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

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

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

/* --------------------------------------------------
   Components
-------------------------------------------------- */
/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  text-decoration: none;
  transition: background-color var(--transition-base),
              color var(--transition-base),
              border-color var(--transition-base),
              box-shadow var(--transition-base),
              transform var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.button--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #ffffff;
  box-shadow: var(--shadow-md);
}

.button--primary:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}

.button--secondary {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
}

.button--secondary:hover {
  border-color: var(--color-primary);
  background-color: rgba(15, 23, 42, 0.9);
}

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

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

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

.button:disabled,
.button[aria-disabled='true'] {
  opacity: 0.5;
  box-shadow: none;
  transform: none;
}

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

/* Inputs */
.input,
textarea,
select {
  width: 100%;
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background-color: var(--color-surface-alt);
  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-text-muted);
}

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

.input--invalid {
  border-color: var(--color-danger);
}

.input--valid {
  border-color: var(--color-success);
}

label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
}

/* Cards (product, info blocks) */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4);
  background: radial-gradient(circle at top left, rgba(37, 99, 235, 0.12), transparent 55%),
              radial-gradient(circle at bottom right, rgba(34, 197, 94, 0.10), transparent 55%),
              var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(148, 163, 184, 0.16);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base),
              box-shadow var(--transition-base),
              border-color var(--transition-base),
              background var(--transition-slow);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(59, 130, 246, 0.5);
}

.card__header {
  margin-bottom: var(--space-2);
}

.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 {
  flex: 1 1 auto;
}

.card__footer {
  margin-top: var(--space-3);
}

/* Product imagery focus */
.card--product {
  padding: var(--space-3);
}

.card--product .card__image {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.card--product img {
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.card--product:hover img {
  transform: scale(1.03);
}

/* Rating stars text helper */
.rating {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: var(--font-size-xs);
  color: var(--color-accent);
}

/* Chips / filters */
.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.8rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  border: 1px solid var(--color-border-subtle);
  background-color: rgba(15, 23, 42, 0.95);
  color: var(--color-text-muted);
  gap: 0.3rem;
}

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

/* --------------------------------------------------
   Sporty / energetic accents (generic)
-------------------------------------------------- */
/* Accent underline for section titles */
.heading-accent {
  position: relative;
  display: inline-block;
  padding-bottom: 0.25rem;
}

.heading-accent::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40%;
  height: 3px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

/* Gradient ribbon bar (e.g., for top nav or highlights) */
.ribbon-gradient {
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

/* Basic section padding */
.section {
  padding: var(--space-10) 0;
}

.section--alt {
  background: radial-gradient(circle at top, rgba(37, 99, 235, 0.14), transparent 55%),
              var(--color-bg);
}

/* End of base.css */