/* Modern Dark-Mode Glassmorphism Design System */
:root {
  --bg-dark: #0f172a;
  --bg-card: rgba(30, 41, 59, 0.7);
  --bg-card-border: rgba(255, 255, 255, 0.1);
  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-emerald: #10b981;
  --accent-cyan: #06b6d4;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --radius: 16px;
  --glass-blur: blur(16px);
  --shadow-glow: 0 10px 30px -10px rgba(99, 102, 241, 0.3);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

body {
  background-color: var(--bg-dark);
  background-image: 
    radial-gradient(at 10% 10%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
    radial-gradient(at 90% 80%, rgba(16, 185, 129, 0.15) 0px, transparent 50%),
    radial-gradient(at 50% 50%, rgba(6, 182, 212, 0.1) 0px, transparent 50%);
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Header & Navigation */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0 3rem 0;
  border-bottom: 1px solid var(--bg-card-border);
  margin-bottom: 3rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, #818cf8 0%, #34d399 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-emerald));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  color: #fff;
  font-size: 1.2rem;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.btn-subscribe {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-hover));
  color: #fff;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 9999px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-glow);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.btn-subscribe:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 35px -8px rgba(99, 102, 241, 0.5);
}

/* Hero Section */
.hero {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 4rem auto;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 9999px;
  font-size: 0.875rem;
  color: #a5b4fc;
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.hero h1 {
  font-size: 3.25rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.hero h1 span {
  background: linear-gradient(135deg, #a5b4fc 0%, #34d399 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto 2rem auto;
}

/* Glassmorphism Cards */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
  margin-bottom: 3rem;
}

/* Playground Layout */
.playground-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1.5rem;
}

@media (max-width: 900px) {
  .playground-grid {
    grid-template-columns: 1fr;
  }
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.form-control, textarea, select {
  width: 100%;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--bg-card-border);
  border-radius: 10px;
  padding: 0.75rem 1rem;
  color: var(--text-main);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

.form-control:focus, textarea:focus, select:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

textarea {
  font-family: 'Fira Code', 'Monaco', monospace;
  font-size: 0.875rem;
  min-height: 220px;
  resize: vertical;
}

.btn-group {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

.btn {
  flex: 1;
  padding: 0.85rem 1.25rem;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.2s;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-hover));
  color: white;
}

.btn-primary:hover {
  opacity: 0.95;
  transform: translateY(-1px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--bg-card-border);
  color: var(--text-main);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 3rem 0;
}

.feature-card {
  background: rgba(30, 41, 59, 0.4);
  border: 1px solid var(--bg-card-border);
  border-radius: 14px;
  padding: 1.5rem;
  transition: transform 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(99, 102, 241, 0.3);
}

.feature-icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
}

.feature-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.feature-desc {
  font-size: 0.925rem;
  color: var(--text-muted);
}

/* Pricing Card */
.pricing-card {
  max-width: 480px;
  margin: 3rem auto;
  text-align: center;
  border: 2px solid var(--accent-primary);
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.8) 0%, rgba(15, 23, 42, 0.9) 100%);
  position: relative;
  overflow: hidden;
}

.pricing-badge {
  position: absolute;
  top: 15px;
  right: -30px;
  background: var(--accent-emerald);
  color: #000;
  font-weight: 800;
  font-size: 0.75rem;
  text-transform: uppercase;
  padding: 4px 35px;
  transform: rotate(45deg);
}

.price {
  font-size: 3.5rem;
  font-weight: 900;
  color: #fff;
  margin: 1rem 0;
}

.price span {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 400;
}

.pricing-features {
  list-style: none;
  text-align: left;
  margin: 1.5rem 0 2rem 0;
}

.pricing-features li {
  padding: 0.5rem 0;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.pricing-features li::before {
  content: "✓";
  color: var(--accent-emerald);
  font-weight: bold;
}

/* Code Snippet Box */
.code-box {
  background: rgba(15, 23, 42, 0.9);
  border-radius: 12px;
  border: 1px solid var(--bg-card-border);
  padding: 1.25rem;
  font-family: 'Fira Code', 'Monaco', monospace;
  font-size: 0.85rem;
  color: #38bdf8;
  overflow-x: auto;
  margin-top: 1rem;
}

footer {
  text-align: center;
  padding: 3rem 0 1.5rem 0;
  color: var(--text-muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--bg-card-border);
}