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

:root {
  /* Colors */
  --color-bg: #0f172a; /* deep slate background */
  --color-surface: #0b1120; /* slightly darker for contrast blocks */
  --color-surface-alt: #111827;
  --color-text: #e5e7eb;
  --color-text-muted: #9ca3af;

  --color-primary: #2563eb; /* cool blue for actions */
  --color-primary-soft: #1d4ed8;
  --color-primary-subtle: rgba(37, 99, 235, 0.12);

  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;

  --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, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji",
    "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  --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 (base) */
  --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: 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-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 18px;
  --radius-pill: 999px;

  /* Shadows (subtle, for professional look) */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.18);
  --shadow-sm: 0 4px 10px rgba(15, 23, 42, 0.25);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.35);

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

/* ========================================================================== 
   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,
ol {
  margin: 0;
  padding: 0;
}

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

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

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

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

/* Remove default focus outlines; we'll re-add for :focus-visible */
:focus {
  outline: none;
}

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

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--font-size-md);
  line-height: var(--line-height-normal);
  background: radial-gradient(circle at top left, #111827 0, #020617 40%, #000 100%);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}

main {
  display: block;
}

h1,
.h1 {
  font-size: clamp(2.25rem, 2.1rem + 0.8vw, 2.75rem);
  line-height: var(--line-height-tight);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
}

h2,
.h2 {
  font-size: clamp(1.75rem, 1.6rem + 0.6vw, 2.1rem);
  line-height: var(--line-height-snug);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}

h3,
.h3 {
  font-size: clamp(1.35rem, 1.25rem + 0.4vw, 1.6rem);
  line-height: var(--line-height-snug);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-2);
}

h4,
.h4 {
  font-size: var(--font-size-xl);
  font-weight: 500;
  line-height: var(--line-height-snug);
  margin-bottom: var(--space-2);
}

h5,
.h5 {
  font-size: var(--font-size-lg);
  font-weight: 500;
  margin-bottom: var(--space-2);
}

h6,
.h6 {
  font-size: var(--font-size-md);
  font-weight: 500;
  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);
}

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

a {
  cursor: pointer;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

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

strong {
  font-weight: 600;
}

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

hr {
  border: none;
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  margin: var(--space-6) 0;
}

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

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

.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;
}

@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;
  }
}

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

/* Layout helpers */

.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 1440px) {
  .container {
    max-width: 1320px;
  }
}

.flex {
  display: flex;
}

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

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

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

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

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

.items-start {
  align-items: flex-start;
}

.items-end {
  align-items: flex-end;
}

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

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

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

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

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

.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-5);
}

@media (max-width: 960px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Simple spacing utilities (for quick adjustments) */

.mt-4 {
  margin-top: var(--space-4);
}

.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);
}

.px-4 {
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

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

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

.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  font-size: var(--font-size-xs);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.badge-primary {
  background: rgba(37, 99, 235, 0.18);
  color: #bfdbfe;
}

.badge-success {
  background: rgba(34, 197, 94, 0.15);
  color: #bbf7d0;
}

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

/* Buttons */

.button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  background: var(--color-primary);
  color: #e5eaf6;
  font-size: var(--font-size-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: none;
  cursor: pointer;
  transition: background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

.button:hover,
.btn:hover {
  background: var(--color-primary-soft);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
  color: #e5eaf6;
}

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

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

.button--secondary,
.btn--secondary {
  background: rgba(15, 23, 42, 0.7);
  border-color: rgba(148, 163, 184, 0.4);
  color: var(--color-text);
}

.button--secondary:hover,
.btn--secondary:hover {
  background: rgba(15, 23, 42, 0.9);
  border-color: rgba(148, 163, 184, 0.7);
  color: var(--color-text);
}

.button--ghost,
.btn--ghost {
  background: transparent;
  border-color: rgba(148, 163, 184, 0.2);
  color: var(--color-text-muted);
}

.button--ghost:hover,
.btn--ghost:hover {
  background: rgba(15, 23, 42, 0.65);
  color: var(--color-text);
}

.button--sm,
.btn--sm {
  padding: 6px 12px;
  font-size: var(--font-size-xs);
}

.button--lg,
.btn--lg {
  padding: 12px 22px;
  font-size: var(--font-size-md);
}

.button[disabled],
.btn[disabled],
.button:disabled,
.btn:disabled {
  cursor: not-allowed;
  opacity: 0.5;
  box-shadow: none;
  transform: none;
}

/* Inputs */

.input,
select,
textarea,
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="search"] {
  width: 100%;
  padding: 9px 12px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(148, 163, 184, 0.45);
  background: rgba(15, 23, 42, 0.8);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  transition: border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

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

.input:focus-visible,
select:focus-visible,
textarea:focus-visible,
input[type="text"]:focus-visible,
input[type="email"]:focus-visible,
input[type="password"]:focus-visible,
input[type="number"]:focus-visible,
input[type="search"]:focus-visible {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.7);
  background-color: rgba(15, 23, 42, 0.95);
}

input[disabled],
select[disabled],
textarea[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

label {
  display: inline-flex;
  align-items: center;
  margin-bottom: 6px;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

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

.form-hint {
  margin-top: 4px;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

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

/* Cards (for product tiles, info boxes, etc.) */

.card {
  position: relative;
  background: linear-gradient(145deg, #020617, #020617 40%, #02091c 100%);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(148, 163, 184, 0.18);
  box-shadow: var(--shadow-xs);
  padding: var(--space-4);
  overflow: hidden;
}

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

.card--hoverable:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(129, 140, 248, 0.6);
}

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

.card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  letter-spacing: -0.01em;
}

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

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

/* Product price emphasis */

.price {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  letter-spacing: -0.03em;
}

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

.price--accent {
  color: var(--color-success);
}

/* Rating stars (for customer reviews) */

.rating {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--font-size-sm);
  color: #facc15;
}

.rating-count {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}