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

:root {
  /* Color Palette - tech-inspired */
  --color-background: #050713; /* deep navy/near-black */
  --color-surface: #0c101c; /* elevated surfaces */
  --color-surface-alt: #151a26; /* subtle contrast */
  --color-text: #f5f7ff; /* primary text */
  --color-text-muted: #a0a7c0; /* secondary text */
  --color-border-subtle: #252a3a;
  --color-border-strong: #3d455c;

  --color-primary: #20b8ff; /* accent cyan */
  --color-primary-soft: rgba(32, 184, 255, 0.08);
  --color-primary-strong: #0ea0e3;

  --color-success: #2ecc71;
  --color-success-soft: rgba(46, 204, 113, 0.12);

  --color-warning: #f5b041;
  --color-warning-soft: rgba(245, 176, 65, 0.16);

  --color-danger: #e74c3c;
  --color-danger-soft: rgba(231, 76, 60, 0.16);

  --color-gray-50: #f8f9fc;
  --color-gray-100: #eef1f7;
  --color-gray-200: #d9deea;
  --color-gray-300: #b4bed5;
  --color-gray-400: #909ab4;
  --color-gray-500: #6a7490;
  --color-gray-600: #4b546c;
  --color-gray-700: #353b4c;
  --color-gray-800: #232736;
  --color-gray-900: #141724;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, 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-base: 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: 1.15;
  --line-height-snug: 1.3;
  --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: 2px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --radius-full: 999px;

  /* Shadows - subtle, techy glow */
  --shadow-xs: 0 0 0 1px rgba(255, 255, 255, 0.02);
  --shadow-sm: 0 8px 20px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 18px 45px rgba(0, 0, 0, 0.55);
  --shadow-soft-glow: 0 0 0 1px rgba(32, 184, 255, 0.22), 0 0 30px rgba(32, 184, 255, 0.18);

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

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

/* ========================================================================
   Reset / Normalize
   ======================================================================== */

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

html,
body {
  margin: 0;
  padding: 0;
}

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

body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
svg,
video,
canvas,
audio,
iframe {
  max-width: 100%;
  height: auto;
}

img,
svg,
video {
  display: block;
}

figure {
  margin: 0;
}

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

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

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

h1,
h2,
h3,
h4,
h5,
h6,
p {
  margin: 0;
}

/* Remove default link styles while preserving semantics */
a {
  color: inherit;
  text-decoration: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

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

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  background-color: var(--color-background);
  color: var(--color-text);
  min-height: 100vh;
}

main {
  min-height: 60vh;
}

/* Headings - scalable, clean hierarchy */

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

h1 {
  font-size: clamp(2.25rem, 4vw, 2.75rem);
  margin-bottom: var(--space-4);
}

h2 {
  font-size: clamp(1.875rem, 3vw, 2.25rem);
  margin-bottom: var(--space-3);
}

h3 {
  font-size: clamp(1.5rem, 2.4vw, 1.875rem);
  margin-bottom: var(--space-3);
}

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

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

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

p {
  margin-bottom: var(--space-3);
  line-height: var(--line-height-relaxed);
  }

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

strong {
  font-weight: 600;
}

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

/* Links - subtle, modern */

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

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

a:active {
  opacity: 0.8;
}

/* ========================================================================
   Accessibility & Motion
   ======================================================================== */

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

:focus:not(:focus-visible) {
  outline: none;
}

@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 Containers */

.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: var(--space-10);
}

.section--tight {
  padding-block: var(--space-6);
}

/* Flex Utilities */

.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;
}

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

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

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

/* Grid Utilities */

.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);
}

.grid-auto-fit {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
}

/* Visibility */

.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:focus {
  position: static;
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* Spacing Utilities (common) */

.mt-0 { margin-top: 0 !important; }
.mt-2 { margin-top: var(--space-2) !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-3 { margin-bottom: var(--space-3) !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-muted {
  color: var(--color-text-muted);
}

/* ========================================================================
   Components - Buttons
   ======================================================================== */

.button,
button,
input[type="button"],
input[type="submit"],
input[type="reset"] {
  --btn-bg: var(--color-primary);
  --btn-bg-hover: var(--color-primary-strong);
  --btn-bg-active: #0a7db3;
  --btn-color: #050713;
  --btn-border-color: transparent;

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding-inline: var(--space-4);
  padding-block: 0.65rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--btn-border-color);
  background: radial-gradient(circle at 10% 0%, rgba(255, 255, 255, 0.08) 0, transparent 55%),
    var(--btn-bg);
  color: var(--btn-color)!important;
  font-size: var(--font-size-sm);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
  transition:
    background-color var(--transition-base),
    color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-fast),
    opacity var(--transition-fast);
}

.button:hover,
button:hover,
input[type="button"]:hover,
input[type="submit"]:hover,
input[type="reset"]:hover {
  background-color: var(--btn-bg-hover);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.02), 0 12px 28px rgba(0, 0, 0, 0.6);
  transform: translateY(-1px);
}

.button:active,
button:active,
input[type="button"]:active,
input[type="submit"]:active,
input[type="reset"]:active {
  background-color: var(--btn-bg-active);
  transform: translateY(0);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.02), 0 4px 14px rgba(0, 0, 0, 0.7);
}

.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;
}

.button--secondary {
  --btn-bg: transparent;
  --btn-bg-hover: rgba(255, 255, 255, 0.04);
  --btn-bg-active: rgba(255, 255, 255, 0.07);
  --btn-color: var(--color-text);
  --btn-border-color: var(--color-border-strong);
}

.button--ghost {
  --btn-bg: transparent;
  --btn-bg-hover: rgba(32, 184, 255, 0.12);
  --btn-bg-active: rgba(32, 184, 255, 0.24);
  --btn-color: var(--color-primary);
  --btn-border-color: rgba(32, 184, 255, 0.4);
}

.button--danger {
  --btn-bg: var(--color-danger);
  --btn-bg-hover: #d63f32;
  --btn-bg-active: #c0392b;
  --btn-color: #ffffff;
}

.button--sm {
  padding-inline: var(--space-3);
  padding-block: 0.45rem;
  font-size: var(--font-size-xs);
}

.button--lg {
  padding-inline: var(--space-5);
  padding-block: 0.85rem;
  font-size: var(--font-size-base);
}

/* ========================================================================
   Components - Form Elements
   ======================================================================== */

.input,
textarea,
select,
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="tel"],
input[type="number"] {
  width: 100%;
  padding-inline: var(--space-3);
  padding-block: 0.6rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background: radial-gradient(circle at 0 0, rgba(255, 255, 255, 0.06) 0, transparent 55%),
    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,
select::placeholder,
input[type="text"]::placeholder,
input[type="email"]::placeholder,
input[type="password"]::placeholder,
input[type="search"]::placeholder,
input[type="tel"]::placeholder,
input[type="number"]::placeholder {
  color: var(--color-gray-400);
}

.input:focus-visible,
textarea:focus-visible,
select:focus-visible,
input[type="text"]:focus-visible,
input[type="email"]:focus-visible,
input[type="password"]:focus-visible,
input[type="search"]:focus-visible,
input[type="tel"]:focus-visible,
input[type="number"]:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px rgba(32, 184, 255, 0.5), 0 0 0 6px rgba(32, 184, 255, 0.16);
}

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

textarea {
  resize: vertical;
  min-height: 120px;
}

label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

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

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

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

/* ========================================================================
   Components - Card
   ======================================================================== */

.card {
  position: relative;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.04);
  background:
    radial-gradient(circle at 0 0, rgba(255, 255, 255, 0.06) 0, transparent 55%),
    linear-gradient(145deg, rgba(255, 255, 255, 0.03), rgba(5, 7, 19, 0.96));
  box-shadow: var(--shadow-sm);
  padding: var(--space-4);
  color: var(--color-text);
  overflow: hidden;
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base),
    border-color var(--transition-base),
    background var(--transition-base);
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(32, 184, 255, 0.35);
  box-shadow: var(--shadow-md);
}

.card--flat {
  box-shadow: none;
  border-color: var(--color-border-subtle);
}

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

.card__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  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;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* Product imagery emphasis */

.card--product img {
  border-radius: var(--radius-md);
  background-color: var(--color-gray-900);
}

.card--product .card__body {
  margin-top: var(--space-3);
}

/* ========================================================================
   Media Queries - Responsive Tweaks
   ======================================================================== */

@media (max-width: 768px) {
  .container,
  .container-wide {
    padding-inline: var(--space-3);
  }

  .section {
    padding-block: var(--space-6);
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 1200px) {
  body {
    font-size: 17px;
  }
}