:root {
  --bg-primary: #0a0f18;
  --bg-secondary: #111a28;
  --bg-card: rgba(18, 28, 45, 0.7);
  --bg-card-hover: rgba(24, 38, 62, 0.85);
  --border-color: rgba(56, 189, 248, 0.15);
  --border-glow: rgba(16, 185, 129, 0.3);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-emerald: #10b981;
  --accent-cyan: #06b6d4;
  --accent-sky: #38bdf8;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  
  --gradient-brand: linear-gradient(135deg, #10b981 0%, #06b6d4 50%, #3b82f6 100%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0) 100%);
  --shadow-glow: 0 0 30px rgba(16, 185, 129, 0.15);
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, monospace;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(16, 185, 129, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 25%, rgba(6, 182, 212, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 50% 80%, rgba(59, 130, 246, 0.05) 0%, transparent 50%);
  background-attachment: fixed;
}

/* Container & Typography */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(10, 15, 24, 0.75);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.35rem;
}

.brand-badge {
  font-size: 0.7rem;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  padding: 0.2rem 0.5rem;
  border-radius: 9999px;
  border: 1px solid rgba(16, 185, 129, 0.3);
  font-family: var(--font-sans);
  font-weight: 600;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.2rem;
  gap: 0.2rem;
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: all 0.2s ease;
}

.lang-btn:hover {
  color: var(--text-primary);
}

.lang-btn.active {
  background: rgba(16, 185, 129, 0.2);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.4);
}


.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

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

.btn-github {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-github:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--accent-cyan);
  transform: translateY(-1px);
}

/* Hero Section */
.hero {
  padding: 5rem 0 3.5rem;
  text-align: center;
  position: relative;
}

.hero-tagline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: 9999px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: var(--accent-emerald);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3.2rem;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 780px;
  margin: 0 auto 2.5rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--gradient-brand);
  color: #05141c;
  padding: 0.85rem 1.75rem;
  border-radius: 10px;
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  box-shadow: 0 4px 20px rgba(6, 182, 212, 0.3);
  transition: all 0.2s ease;
}

.btn-primary:hover {
  box-shadow: 0 6px 25px rgba(16, 185, 129, 0.45);
  transform: translateY(-2px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(18, 28, 45, 0.8);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.85rem 1.75rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: rgba(24, 38, 62, 0.95);
  border-color: var(--accent-sky);
  transform: translateY(-2px);
}

/* Stats Pill Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin: 3.5rem 0 4.5rem;
}

.stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  border-radius: 12px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: all 0.25s ease;
}

.stat-card:hover {
  border-color: var(--accent-emerald);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.stat-value {
  font-size: 2.2rem;
  font-weight: 800;
  font-family: var(--font-heading);
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Filter Buttons */
.section-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-title {
  font-size: 2.2rem;
  margin-bottom: 0.75rem;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 650px;
  margin: 0 auto;
}

.filter-bar {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.filter-btn {
  background: rgba(18, 28, 45, 0.7);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.5rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-btn:hover, .filter-btn.active {
  background: rgba(16, 185, 129, 0.15);
  border-color: var(--accent-emerald);
  color: var(--text-primary);
}

/* Packages Grid */
.packages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.pkg-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.pkg-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.pkg-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.pkg-icon {
  font-size: 1.75rem;
  background: rgba(255, 255, 255, 0.05);
  padding: 0.6rem;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.pkg-tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.pkg-name {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  color: var(--accent-sky);
}

.pkg-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.pkg-install-box {
  background: rgba(10, 15, 24, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 0.6rem 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.copy-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s ease;
  font-size: 0.9rem;
}

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

.pkg-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1rem;
  font-size: 0.85rem;
}

.pkg-link {
  color: var(--accent-emerald);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: gap 0.2s ease;
}

.pkg-link:hover {
  gap: 0.5rem;
}

/* Interactive Simulator */
.interactive-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2.5rem;
  margin: 4rem 0;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.sim-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

@media (max-width: 860px) {
  .sim-grid {
    grid-template-columns: 1fr;
  }
}

.sim-input-box, .sim-output-box {
  background: rgba(10, 15, 24, 0.85);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
}

.sim-header {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
  font-weight: 500;
}

.form-control {
  width: 100%;
  background: rgba(18, 28, 45, 0.9);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.6rem 0.85rem;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  transition: border-color 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-cyan);
}

.code-output {
  background: #06090e;
  border-radius: 8px;
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #38bdf8;
  white-space: pre-wrap;
  max-height: 280px;
  overflow-y: auto;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Architecture Flow */
.flow-diagram-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2.5rem;
  margin: 3.5rem 0;
  text-align: center;
}

.pipeline-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

.step-card {
  background: rgba(10, 15, 24, 0.7);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  position: relative;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.1);
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.75rem;
}

.step-title {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.step-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-color);
  background: rgba(10, 15, 24, 0.95);
  padding: 3.5rem 0 2rem;
  margin-top: 5rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  max-width: 340px;
  margin-top: 0.5rem;
}

.footer-links-group h4 {
  color: var(--text-primary);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}