/* ========================================================================
   Variables
   ======================================================================== */
:root {
  /* Color Palette - Tech-forward, minimalist */
  --color-bg: #050712; /* Deep navy background */
  --color-surface: #0f111a; /* Raised surfaces */
  --color-surface-alt: #161827; /* Alternate surface */
  --color-text: #f5f7ff; /* Primary text (near white) */
  --color-text-muted: #9ca3b5; /* Muted / secondary text */
  --color-border-subtle: #25293a;
  --color-border-strong: #3a3f55;

  --color-primary: #2a7cff; /* Electric blue */
  --color-primary-soft: rgba(42, 124, 255, 0.12);
  --color-primary-strong: #1e5fd0;

  --color-success: #29c78f; /* Accent green */
  --color-success-soft: rgba(41, 199, 143, 0.14);
  --color-warning: #f5b746;
  --color-warning-soft: rgba(245, 183, 70, 0.16);
  --color-danger: #ff4b6a;
  --color-danger-soft: rgba(255, 75, 106, 0.16);

  --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: #1f2933;
  --color-gray-900: #111827;

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

  /* 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 - subtle, techy */
  --shadow-xs: 0 1px 2px rgba(5, 7, 18, 0.45);
  --shadow-sm: 0 8px 20px rgba(5, 7, 18, 0.55);
  --shadow-md: 0 14px 40px rgba(5, 7, 18, 0.7);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-md: 200ms ease-out;
  --transition-slow: 320ms ease-out;

  /* Layout */
  --layout-max-width: 1200px;
  --layout-grid-gutter: 1.5rem;
}

/* Respect user motion preferences */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-md: 0ms;
    --transition-slow: 0ms;
  }
}

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

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

body {
  margin: 0;
}

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

ul[role="list"],
ol[role="list"] {
  list-style: none;
  margin: 0;
  padding: 0;
}

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

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

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

textarea {
  resize: vertical;
}

/* Remove default link underlines, handled in base styles */
a {
  text-decoration: none;
  color: inherit;
}

/* ========================================================================
   Base Styles
   ======================================================================== */
body {
  min-height: 100vh;
  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;
  text-rendering: optimizeLegibility;
}

main {
  display: block;
}

/* Headings: scalable sizes with margin control */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 {
  font-size: clamp(2.25rem, 2.4vw + 1.5rem, 3.25rem);
  letter-spacing: -0.04em;
  margin-bottom: var(--space-4);
}

h2 {
  font-size: clamp(1.875rem, 1.8vw + 1.2rem, 2.5rem);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-3);
}

h3 {
  font-size: var(--font-size-2xl);
  letter-spacing: -0.02em;
  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);
}

/* Paragraphs with comfortable line length */
p {
  margin-bottom: var(--space-3);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-muted);
}

/* Links */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-md),
              opacity var(--transition-fast),
              box-shadow var(--transition-md);
}

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

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

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

/* Lists */
ul, ol {
  margin: 0 0 var(--space-3);
  padding-left: var(--space-5);
}



/* ========================================================================
   Accessibility & Focus
   ======================================================================== */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* Visually hidden (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;
}

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

/* Layout container */
.container {
  width: 100%;
  max-width: var(--layout-max-width);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 1024px) {
  .container {
    padding-inline: var(--space-6);
  }
}

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

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

.gap-xs { gap: var(--space-2); }
.gap-sm { gap: var(--space-3); }
.gap-md { gap: var(--space-4); }
.gap-lg { gap: var(--space-6); }

/* Grid helpers */
.grid {
  display: grid;
  gap: var(--space-4);
}

.grid-2 {
  display: grid;
  gap: var(--space-4);
}

.grid-3 {
  display: grid;
  gap: var(--space-5);
}

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

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

/* Simple spacing utilities for common cases */
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-sm { margin-top: var(--space-3); }
.mb-sm { margin-bottom: var(--space-3); }
.mt-md { margin-top: var(--space-4); }
.mb-md { margin-bottom: var(--space-4); }
.mt-lg { margin-top: var(--space-6); }
.mb-lg { margin-bottom: var(--space-6); }

/* Text utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-muted); }

/* Surface utilities for subtle elevation */
.surface {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
}

.surface-alt {
  background-color: var(--color-surface-alt);
  border-radius: var(--radius-lg);
}

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

/* Buttons */
.button,
button,
input[type="button"],
input[type="submit"],
input[type="reset"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.3rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: var(--font-size-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-strong));
  color: #ffffff!important;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.55);
  transition:
    background-color var(--transition-md),
    box-shadow var(--transition-md),
    transform var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    opacity var(--transition-fast);
}

.button:hover,
button:hover,
input[type="button"]:hover,
input[type="submit"]:hover,
input[type="reset"]:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.button:active,
button:active,
input[type="button"]:active,
input[type="submit"]:active,
input[type="reset"]:active {
  transform: translateY(0);
  box-shadow: var(--shadow-xs);
}

.button:focus-visible,
button:focus-visible,
input[type="button"]:focus-visible,
input[type="submit"]:focus-visible,
input[type="reset"]:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.button--secondary {
  background: transparent;
  border-color: var(--color-border-strong);
  color: var(--color-text)!important;
  box-shadow: none;
}

.button--secondary:hover {
  border-color: var(--color-primary);
  background: radial-gradient(circle at top left, var(--color-primary-soft), transparent 55%);
}

.button--ghost {
  background: transparent;
  border-color: transparent;
  color: var(--color-text-muted)!important;
  box-shadow: none;
}

.button--ghost:hover {
  background-color: rgba(255, 255, 255, 0.04);
  color: var(--color-text)!important;
}

.button--danger {
  background: linear-gradient(135deg, var(--color-danger), #ff1f4b);
}

.button[disabled],
button[disabled],
input[type="button"][disabled],
input[type="submit"][disabled],
input[type="reset"][disabled],
.button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
  box-shadow: none;
  transform: none;
}

/* Inputs & Form Controls */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="tel"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background-color: rgba(15, 17, 26, 0.95);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: 1.4;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

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 var(--color-primary-soft);
  outline: none;
}

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

/* Cards */
.card {
  position: relative;
  background: radial-gradient(circle at top left, rgba(42, 124, 255, 0.12), transparent 55%),
              radial-gradient(circle at bottom right, rgba(41, 199, 143, 0.08), transparent 60%),
              var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(255, 255, 255, 0.02);
  backdrop-filter: blur(18px);
  transition:
    transform var(--transition-md),
    box-shadow var(--transition-md),
    border-color var(--transition-md),
    background var(--transition-slow);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(42, 124, 255, 0.4);
}

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

.card-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-2);
}

.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-muted);
}

.card-actions {
  margin-top: var(--space-4);
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

/* Media wrapper for high-resolution imagery */
.card-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: #050712;
}

.card-media img {
  display: block;
  width: 100%;
  height: auto;
}

/* ========================================================================
   Motion Preferences
   ======================================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}