:root {
  /* Color Palette */
  --color-violet: #8a2be2;
  --color-teal: #008080;
  --color-magenta: #ff00ff;
  --color-cyan: #00ffff;

  --bg-color: #ffffff;
  --text-color: #1a1a2e;
  --text-muted: #4a4a6a;

  --card-bg: rgba(255, 255, 255, 0.7);
  --card-border: rgba(255, 255, 255, 0.4);

  --hero-gradient: linear-gradient(135deg, var(--color-violet), var(--color-teal), var(--color-magenta));

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';

  /* Metrics */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #0f0f1a;
    --text-color: #e0e0ff;
    --text-muted: #a0a0c0;

    --card-bg: rgba(20, 20, 35, 0.7);
    --card-border: rgba(255, 255, 255, 0.1);
  }
}

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

html {
  scroll-behavior: smooth;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  line-height: 1.2;
  font-weight: 700;
}

p {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--color-teal);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-violet);
  text-decoration: underline;
}

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xl) 0;
}

/* Glassmorphism */
.glass-card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

/* Header & Hero */
.site-header {
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(var(--bg-color), 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--card-border);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-title {
  font-size: 1.5rem;
  margin: 0;
  background: var(--hero-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero {
  position: relative;
  text-align: center;
  padding: calc(var(--spacing-xl) * 2) 0;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: var(--hero-gradient);
  opacity: 0.1;
  z-index: -1;
  filter: blur(100px);
  animation: pulse 15s infinite alternate;
}

@keyframes pulse {
  0% { transform: scale(1); }
  100% { transform: scale(1.1); }
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  margin-bottom: var(--spacing-md);
  background: var(--hero-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
}

/* Components */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  font-family: var(--font-sans);
}

.btn-primary {
  background: var(--hero-gradient);
  color: white;
  box-shadow: 0 4px 15px rgba(138, 43, 226, 0.4);
}

.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(138, 43, 226, 0.6);
  transform: translateY(-2px);
  color: white;
  text-decoration: none;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

@media (min-width: 600px) {
  .input-group {
    flex-direction: row;
  }
}

.input-group input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-color);
  font-family: var(--font-sans);
  font-size: 1rem;
  backdrop-filter: blur(4px);
}

.input-group input:focus {
  outline: 2px solid var(--color-violet);
  border-color: transparent;
}

/* Accessibility Focus States */
:focus-visible {
  outline: 3px solid var(--color-violet);
  outline-offset: 3px;
}

/* Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

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

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

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

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Avatar Generator Container */
#avatar-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 250px;
  background: var(--card-bg);
  border: 1px dashed var(--card-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
  overflow: hidden;
}

#avatar-container svg {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

.site-footer {
  text-align: center;
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--card-border);
  margin-top: var(--spacing-xl);
  color: var(--text-muted);
}
.site-footer a {
  margin: 0 var(--spacing-sm);
}

/* Utility */
.text-center { text-align: center; }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}