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

:root {
  /* Colors */
  --color-bg: #05060a; /* near-black graphite */
  --color-bg-elevated: #0f1118;
  --color-bg-soft: #151827;
  --color-surface: #1b2033;
  --color-surface-alt: #222842;

  --color-text: #f5f7ff;
  --color-text-soft: #c2c7dc;
  --color-text-muted: #8b90a4;
  --color-border-subtle: #2c3150;

  --color-primary: #2ee5a4; /* electric green */
  --color-primary-soft: rgba(46, 229, 164, 0.12);
  --color-primary-strong: #18c486;
  --color-primary-contrast: #020308;

  --color-accent: #3a7dff; /* deep electric blue */
  --color-accent-soft: rgba(58, 125, 255, 0.16);

  --color-success: #29c46a;
  --color-warning: #ffb648;
  --color-danger: #ff5260;

  /* Neutral grays for borders, disabled, etc. */
  --gray-50: #f8fafc;
  --gray-100: #e2e8f0;
  --gray-200: #cbd5f5;
  --gray-300: #94a3b8;
  --gray-400: #64748b;
  --gray-500: #475569;
  --gray-600: #334155;
  --gray-700: #1e293b;
  --gray-800: #0f172a;
  --gray-900: #020617;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Segoe UI", 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 */

  --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 */

  /* Radii */
  --radius-xs: 3px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 999px;

  /* Shadows (soft, techy glow) */
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.4);
  --shadow-elevated: 0 24px 60px rgba(0, 0, 0, 0.7);
  --shadow-glow-primary: 0 0 0 1px rgba(46, 229, 164, 0.4), 0 0 30px rgba(46, 229, 164, 0.18);

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

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

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

/* ========================================================================== 
   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,
svg,
video,
canvas,
iframe {
  display: block;
  max-width: 100%;
}

picture {
  display: block;
}

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

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

ul,
ol {
  margin: 0;
  padding: 0;
}

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

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

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

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-md);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background: radial-gradient(circle at top left, #151b2d 0, #05060a 50%, #020307 100%);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  min-height: 60vh;
}

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

h1 {
  font-size: clamp(2.25rem, 1.7rem + 1.5vw, 3rem);
  margin-bottom: var(--space-4);
}

h2 {
  font-size: clamp(1.75rem, 1.4rem + 0.7vw, 2.25rem);
  margin-bottom: var(--space-3);
}

h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-3);
}

h4 {
  font-size: 1.25rem;
  margin-bottom: var(--space-2);
}

h5 {
  font-size: 1.125rem;
  margin-bottom: var(--space-2);
}

h6 {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-soft);
  }

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

strong {
  font-weight: 600;
}

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

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

a:active {
  opacity: 0.85;
}

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

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

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

:focus {
  outline: none;
}

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

@supports selector(:focus-visible) {
  :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;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

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

.container--wide {
  max-width: var(--container-wide-width);
}

.section {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

.section--tight {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}

/* Flex helpers */
.flex {
  display: flex;
}

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

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

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

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

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

/* Grid helpers */
.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);
}

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

/* Text utilities */
.text-center {
  text-align: center;
}

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

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

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

/* Spacing utilities (selected for common use) */
.mt-0 { margin-top: 0 !important; }
.mt-4 { margin-top: var(--space-4) !important; }
.mt-6 { margin-top: var(--space-6) !important; }
.mb-0 { margin-bottom: 0 !important; }
.mb-2 { margin-bottom: var(--space-2) !important; }
.mb-4 { margin-bottom: var(--space-4) !important; }
.mb-6 { margin-bottom: var(--space-6) !important; }
.pt-6 { padding-top: var(--space-6) !important; }
.pb-6 { padding-bottom: var(--space-6) !important; }

/* Layout helpers */
.full-bleed {
  width: 100vw;
  position: relative;
  left: 50%;
  right: 50%;
  margin-left: -50vw;
  margin-right: -50vw;
}

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

/* Buttons */
.btn {
  --btn-bg: var(--color-surface-alt);
  --btn-bg-hover: #2b3455;
  --btn-color: var(--color-text);
  --btn-border: transparent;

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.65rem 1.3rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--btn-color)!important;
  font-size: var(--font-size-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color var(--transition-md), border-color var(--transition-md), box-shadow var(--transition-md), transform var(--transition-fast), color var(--transition-md), opacity var(--transition-fast);
  white-space: nowrap;
}

.btn:hover:not(:disabled) {
  background: var(--btn-bg-hover);
  transform: translateY(-1px);
}

.btn:active:not(:disabled) {
  transform: translateY(0);
  opacity: 0.9;
}

.btn:disabled,
.btn[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.6;
  box-shadow: none;
}

.btn-primary {
  --btn-bg: linear-gradient(135deg, var(--color-primary) 0%, #3bffcf 100%);
  --btn-bg-hover: linear-gradient(135deg, var(--color-primary-strong) 0%, #2ee5a4 100%);
  --btn-color: var(--color-primary-contrast);
  --btn-border: transparent;
  box-shadow: var(--shadow-glow-primary);
}

.btn-outline {
  --btn-bg: transparent;
  --btn-bg-hover: rgba(58, 125, 255, 0.08);
  --btn-color: var(--color-text-soft);
  --btn-border: var(--color-border-subtle);
}

.btn-ghost {
  --btn-bg: transparent;
  --btn-bg-hover: rgba(255, 255, 255, 0.04);
  --btn-border: transparent;
  --btn-color: var(--color-text-soft);
  padding-left: 0.25rem;
  padding-right: 0.25rem;
  border-radius: var(--radius-sm);
}

.btn-icon {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border-radius: 999px;
}

.btn-lg {
  padding: 0.85rem 1.7rem;
  font-size: var(--font-size-md);
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: var(--font-size-xs);
}

.btn:focus-visible {
  box-shadow: 0 0 0 2px var(--color-primary-contrast), 0 0 0 4px var(--color-primary);
}

/* Inputs & form controls */
.input,
select,
textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-subtle);
  background-color: rgba(10, 13, 27, 0.9);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  transition: border-color var(--transition-md), box-shadow var(--transition-md), background-color var(--transition-md);
}

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

.input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px rgba(46, 229, 164, 0.8), 0 0 0 4px rgba(46, 229, 164, 0.2);
}

.input[aria-invalid="true"],
.input--error {
  border-color: var(--color-danger);
}

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

label {
  display: inline-block;
  margin-bottom: var(--space-1);
  font-size: var(--font-size-sm);
  color: var(--color-text-soft);
}

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

.form-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.form-error {
  font-size: var(--font-size-xs);
  color: var(--color-danger);
  margin-top: var(--space-1);
}

/* Card */
.card {
  background: radial-gradient(circle at top, rgba(58, 125, 255, 0.08) 0, rgba(5, 6, 10, 0.98) 40%, #05060a 100%);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(99, 102, 241, 0.18);
  padding: var(--space-5);
  box-shadow: var(--shadow-soft);
  color: var(--color-text);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(46, 229, 164, 0.16), transparent 55%);
  opacity: 0.7;
  pointer-events: none;
}

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

.card-footer {
  margin-top: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

/* Subtle interactive elevation */
.card--interactive {
  cursor: pointer;
  transition: transform var(--transition-md), box-shadow var(--transition-md), border-color var(--transition-md);
}

.card--interactive:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-elevated);
  border-color: rgba(46, 229, 164, 0.4);
}

.card--interactive:focus-visible {
  outline: none;
  box-shadow: var(--shadow-elevated), 0 0 0 2px rgba(46, 229, 164, 0.9);
}

/* Tag / badge */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border: 1px solid rgba(148, 163, 184, 0.5);
  color: var(--color-text-muted);
  background: rgba(15, 23, 42, 0.7);
}

.badge--success {
  border-color: rgba(34, 197, 94, 0.5);
  color: #bbf7d0;
  background: rgba(22, 163, 74, 0.2);
}

.badge--warning {
  border-color: rgba(250, 204, 21, 0.6);
  color: #fef3c7;
  background: rgba(202, 138, 4, 0.2);
}

/* Helper for techy panels (filters, summaries) */
.panel {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background: linear-gradient(145deg, rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 0.7));
  padding: var(--space-4);
}

.panel--subtle {
  background: rgba(15, 23, 42, 0.7);
}

/* Toast / status chip */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.7rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.45);
  color: var(--color-text-soft);
}

.chip--success {
  border-color: rgba(34, 197, 94, 0.6);
  color: #bbf7d0;
}

.chip--danger {
  border-color: rgba(248, 113, 113, 0.6);
  color: #fee2e2;
}

/* ========================================================================== 
   Responsive tweaks for mobile commerce
   ========================================================================== */

@media (max-width: 768px) {
  body {
    font-size: var(--font-size-sm);
  }

  .section {
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
  }

  .card {
    padding: var(--space-4);
  }

  h1 {
    margin-bottom: var(--space-3);
  }
}