/* ==========================================================================
   Variables
   ========================================================================== */
:root {
  /* Colors */
  --color-bg: #05070b; /* deep graphite black */
  --color-bg-elevated: #0f1117;
  --color-bg-subtle: #141823;
  --color-surface: #10131c;

  --color-text: #f5f7ff;
  --color-text-muted: #a3a9c2;
  --color-border-subtle: #252a39;
  --color-border-strong: #3a3f52;

  --color-primary: #2f7df6; /* electric blue */
  --color-primary-soft: rgba(47, 125, 246, 0.12);
  --color-primary-strong: #165cd5;

  --color-success: #2dd4bf;
  --color-warning: #fbbf24;
  --color-danger: #f97373;

  --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: #111827;
  --color-gray-900: #020617;

  --color-accent-neon: #48f7e2; /* subtle neon accent */
  --color-silver: #c4ccd8; /* cool silver */
  --color-white: #ffffff;
  --color-black: #000000;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Roboto", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, Monaco, Consolas, "Liberation Mono", 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: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 28px;
  --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 */
  --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.35);
  --shadow-elevated: 0 24px 80px rgba(0, 0, 0, 0.65);
  --shadow-outline: 0 0 0 1px rgba(72, 247, 226, 0.6), 0 0 0 4px rgba(47, 125, 246, 0.55);

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

/* Respect prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0.001ms linear;
    --transition-normal: 0.001ms linear;
    --transition-slow: 0.001ms linear;
  }

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

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

* {
  margin: 0;
}

html,
body {
  height: 100%;
}

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

body {
  line-height: var(--line-height-normal);
}

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;
}

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

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

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

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

textarea {
  resize: vertical;
}

/* ==========================================================================
   Base Styles
   ========================================================================== */
body {
  font-family: var(--font-sans);
  font-size: var(--font-size-md);
  background-color: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  min-height: 100vh;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-white);
}

h1 {
  font-size: clamp(2.5rem, 1.7rem + 1.6vw, 3.25rem);
  letter-spacing: 0.02em;
  margin-bottom: var(--space-4);
}

h2 {
  font-size: clamp(2rem, 1.4rem + 1vw, 2.5rem);
  margin-bottom: var(--space-3);
}

h3 {
  font-size: clamp(1.5rem, 1.2rem + 0.6vw, 1.875rem);
  margin-bottom: var(--space-2);
}

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

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

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

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

strong,
b {
  font-weight: 600;
}

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

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

a:hover {
  color: var(--color-accent-neon);
}

a:focus-visible {
  outline: none;
  text-shadow: 0 0 0.7px var(--color-accent-neon), 0 0 2px rgba(72, 247, 226, 0.7);
}

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

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

/* ==========================================================================
   Accessibility & Focus
   ========================================================================== */
:focus-visible {
  outline: none;
  box-shadow: var(--shadow-outline);
  border-radius: var(--radius-sm);
}

[tabindex="-1"]:focus-visible {
  box-shadow: 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:active,
.sr-only-focusable:focus {
  position: static;
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* ==========================================================================
   Utilities
   ========================================================================== */
/* Layout */
.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: 1440px) {
  .container {
    max-width: 1320px;
  }
}

.flex {
  display: flex;
}

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

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

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

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

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

.grid {
  display: grid;
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
  align-items: center;
}

.grid-auto-fit {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
}

/* Spacing helpers (limited, extend as needed) */
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.mt-4 { margin-top: var(--space-4) !important; }
.mb-4 { margin-bottom: var(--space-4) !important; }
.pt-4 { padding-top: var(--space-4) !important; }
.pb-4 { padding-bottom: var(--space-4) !important; }

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

.w-full { width: 100% !important; }

/* High-tech divider / subtle glow utility */
.glow-border {
  position: relative;
}

.glow-border::before {
  content: "";
  pointer-events: none;
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(72, 247, 226, 0.08), rgba(47, 125, 246, 0.18));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.glow-border:hover::before {
  opacity: 1;
}

/* ==========================================================================
   Components
   ========================================================================== */
/* Buttons */
.button,
button,
input[type="button"],
input[type="submit"],
input[type="reset"] {
  --button-bg: var(--color-primary);
  --button-bg-hover: var(--color-primary-strong);
  --button-bg-active: #0b3a91;
  --button-color: var(--color-white);
  --button-border: transparent;

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--button-border);
  background: radial-gradient(circle at 0% 0%, rgba(72, 247, 226, 0.2), transparent 55%),
    linear-gradient(135deg, var(--button-bg), var(--color-primary-strong));
  color: var(--button-color);
  font-size: var(--font-size-sm);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    background var(--transition-normal),
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    opacity var(--transition-fast),
    color var(--transition-fast);
  box-shadow: 0 0 0 1px rgba(47, 125, 246, 0.4), 0 10px 30px rgba(0, 0, 0, 0.6);
}

.button:hover,
button:hover,
input[type="button"]:hover,
input[type="submit"]:hover,
input[type="reset"]:hover {
  background: radial-gradient(circle at 0% 0%, rgba(72, 247, 226, 0.34), transparent 60%),
    linear-gradient(135deg, var(--color-primary-strong), var(--color-primary));
  transform: translateY(-1px);
  box-shadow: 0 0 12px rgba(72, 247, 226, 0.4), 0 18px 45px rgba(0, 0, 0, 0.7);
}

.button:active,
button:active,
input[type="button"]:active,
input[type="submit"]:active,
input[type="reset"]:active {
  transform: translateY(0);
  background: linear-gradient(135deg, var(--button-bg-active), var(--color-primary-strong));
  box-shadow: 0 5px 18px rgba(0, 0, 0, 0.9);
}

.button:disabled,
button:disabled,
input[type="button"]:disabled,
input[type="submit"]:disabled,
input[type="reset"]:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  box-shadow: none;
  background: linear-gradient(135deg, #232735, #1b1f2b);
  border-color: var(--color-border-subtle);
}

.button--ghost {
  --button-bg: transparent;
  --button-bg-hover: rgba(47, 125, 246, 0.18);
  --button-color: var(--color-text);
  --button-border: rgba(72, 247, 226, 0.45);

  background: radial-gradient(circle at 0% 0%, rgba(72, 247, 226, 0.26), transparent 52%),
    linear-gradient(135deg, rgba(17, 24, 39, 0.7), rgba(15, 23, 42, 0.95));
  box-shadow: 0 0 0 1px rgba(72, 247, 226, 0.45);
}

.button--ghost:hover {
  background: radial-gradient(circle at 0% 0%, rgba(72, 247, 226, 0.5), transparent 60%),
    linear-gradient(135deg, rgba(15, 23, 42, 0.95), rgba(17, 24, 39, 0.95));
}

/* Inputs & Form Controls */
.input,
select,
textarea,
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="number"],
input[type="tel"] {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background-color: rgba(6, 10, 20, 0.96);
  color: var(--color-text);
  padding: 0.7rem 0.9rem;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast);
  box-shadow: inset 0 0 0 1px rgba(9, 13, 25, 0.9);
}

.input::placeholder,
select::placeholder,
textarea::placeholder,
input[type="text"]::placeholder,
input[type="email"]::placeholder,
input[type="password"]::placeholder,
input[type="search"]::placeholder,
input[type="number"]::placeholder,
input[type="tel"]::placeholder {
  color: rgba(163, 169, 194, 0.7);
}

.input:focus,
select:focus,
textarea:focus,
input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="search"]:focus,
input[type="number"]:focus,
input[type="tel"]:focus {
  outline: none;
  border-color: rgba(72, 247, 226, 0.8);
  background-color: #050812;
  box-shadow: 0 0 0 1px rgba(72, 247, 226, 0.8), 0 0 24px rgba(32, 148, 244, 0.35);
  transform: translateY(-0.5px);
}

.input:disabled,
select:disabled,
textarea:disabled,
input[type="text"]:disabled,
input[type="email"]:disabled,
input[type="password"]:disabled,
input[type="search"]:disabled,
input[type="number"]:disabled,
input[type="tel"]:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

label {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

/* Card */
.card {
  position: relative;
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  background: radial-gradient(circle at 0% 0%, rgba(72, 247, 226, 0.06), transparent 55%),
    linear-gradient(145deg, rgba(9, 11, 22, 0.98), rgba(3, 6, 17, 0.98));
  border: 1px solid rgba(45, 55, 72, 0.9);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition:
    transform var(--transition-normal),
    box-shadow var(--transition-normal),
    border-color var(--transition-fast),
    background var(--transition-normal);
}

.card:hover {
  transform: translateY(-3px);
  border-color: rgba(72, 247, 226, 0.6);
  box-shadow: var(--shadow-elevated);
  background: radial-gradient(circle at 0% 0%, rgba(72, 247, 226, 0.14), transparent 60%),
    linear-gradient(145deg, rgba(9, 11, 22, 0.98), rgba(3, 6, 17, 0.98));
}

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

.card-title {
  font-size: var(--font-size-xl);
  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);
}

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

/* Product image wrapper (common in e-commerce) */
.product-media {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: radial-gradient(circle at 20% -10%, rgba(72, 247, 226, 0.3), transparent 55%),
    radial-gradient(circle at 80% 110%, rgba(47, 125, 246, 0.5), transparent 55%),
    #05070b;
}

.product-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal), filter var(--transition-normal);
}

.product-media:hover img {
  transform: scale(1.03);
  filter: saturate(1.05);
}

.product-badge {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-pill);
  background: rgba(5, 150, 105, 0.9);
  color: var(--color-white);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Tag / pill for specs or categories */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.7);
  background: rgba(15, 23, 42, 0.8);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tag--primary {
  border-color: rgba(47, 125, 246, 0.8);
  color: var(--color-accent-neon);
}

/* Price text utility */
.price {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-white);
}

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

/* Global section wrapper */
.section {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

.section--alt {
  background: radial-gradient(circle at 0% 0%, rgba(72, 247, 226, 0.12), transparent 60%),
    radial-gradient(circle at 100% 100%, rgba(47, 125, 246, 0.22), transparent 55%),
    #05070b;
}