:root {
  /* Color Palette - SimDuty Official Dark Theme */
  /* Source: src/Gui/Resources/Theme.Dark.xaml */

  --bg-deep: #050505;
  /* Brush.DeepBackground */
  --bg-surface: #1A1A1A;
  /* Brush.CardSurface */
  --bg-card: #141414;
  /* Brush.CardDark */

  --border-generic: #333333;
  /* Brush.BorderGeneric */
  --border-accent: #00E5FF;
  /* Brush.BorderAccent (Cyan) */

  --text-primary: #FFFFFF;
  /* Brush.TextPrimary */
  --text-secondary: #B0B0B0;
  /* Brush.TextSecondary */
  --text-muted: #888888;
  /* Brush.Status.LabelDim */

  --accent-primary: #00E5FF;
  /* Brush.BorderAccent (Cyan) - Main Brand */
  --accent-active: #FFC107;
  /* Brush.ActiveAccent (Amber) - Highlights/Warnings */

  --status-good: #4CAF50;
  /* Brush.Status.Good */
  --status-critical: #F44336;
  /* Brush.Status.Critical */

  /* Spacing & Layout */
  --container-width: 1100px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Typography */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'Roboto Mono', monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s, text-shadow 0.2s;
}

ul {
  list-style: none;
}

/* Utilities */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.text-brand {
  color: var(--accent-primary);
}

.text-mono {
  font-family: var(--font-mono);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Header / Nav */
.site-header {
  border-bottom: 1px solid var(--border-generic);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  background-color: rgba(5, 5, 5, 0.95);
  /* Deep BG transparency */
  backdrop-filter: blur(8px);
  z-index: 100;
}

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

.logo {
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
}

.logo span {
  color: var(--accent-primary);
  text-shadow: 0 0 10px rgba(0, 229, 255, 0.4);
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links {
  display: flex;
  gap: 2rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--accent-primary);
}

/* Language Switcher */
.lang-switcher select {
  background-color: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-generic);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  cursor: pointer;
  outline: none;
}

.lang-switcher select:focus {
  border-color: var(--accent-primary);
}

/* Hero Section */
.hero {
  padding: 6rem 0;
  text-align: center;
  border-bottom: 1px solid var(--border-generic);
  /* Subtle gradient overlay */
  background: radial-gradient(circle at center, #1a1a1a 0%, #050505 80%);
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  line-height: 1.1;
  color: var(--text-primary);
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background-color: rgba(255, 193, 7, 0.1);
  /* Amber tint */
  color: var(--accent-active);
  border: 1px solid rgba(255, 193, 7, 0.3);
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  letter-spacing: 0.05em;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--accent-primary);
  color: #000;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1rem;
  transition: transform 0.1s, background-color 0.2s, box-shadow 0.2s;
  box-shadow: 0 0 15px rgba(0, 229, 255, 0.2);
}

.btn:hover {
  background-color: #33EBFF;
  /* Slightly lighter Cyan */
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.4);
}

.btn:active {
  transform: translateY(0);
}

/* Features Grid */
.features {
  padding: 5rem 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-generic);
  padding: 2rem;
  border-radius: var(--radius-md);
  transition: border-color 0.2s, transform 0.2s;
}

.card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

.card h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-primary);
}

.card svg {
  color: var(--accent-primary);
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Download & Verify Section */
.download-section {
  padding: 5rem 0;
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-generic);
  border-bottom: 1px solid var(--border-generic);
}

.download-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.verify-box {
  background-color: #000;
  border: 1px solid var(--border-generic);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  position: relative;
}

.verify-box h4 {
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  letter-spacing: 0.05em;
}

.hash-display {
  word-break: break-all;
  color: var(--accent-active);
  /* Amber for hash */
  margin-bottom: 1rem;
  display: block;
  min-height: 3em;
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--border-generic);
  color: var(--text-secondary);
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}

.copy-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* Installation */
.installation {
  padding: 5rem 0;
}

.steps {
  counter-reset: install-step;
  margin-top: 2rem;
  display: grid;
  gap: 2rem;
}

.step-item {
  position: relative;
  padding-left: 3.5rem;
}

.step-item::before {
  counter-increment: install-step;
  content: counter(install-step);
  position: absolute;
  left: 0;
  top: 0;
  width: 2.5rem;
  height: 2.5rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-generic);
  color: var(--accent-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}

.step-item h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.step-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

code {
  background-color: rgba(255, 255, 255, 0.05);
  padding: 0.2em 0.4em;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--accent-active);
}

/* Footer */
.site-footer {
  padding: 3rem 0;
  border-top: 1px solid var(--border-generic);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-links {
  margin-bottom: 1rem;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}

.footer-links a:hover {
  color: var(--accent-primary);
}

@media (max-width: 768px) {
  .download-container {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 2.5rem;
  }
}