/* ==============================================================================
   LEVITA — Design Tokens & Core Stylesheet
   Modern, Dark Mode, High Performance, Zero External Dependencies
   ============================================================================== */

:root {
  --bg-primary: #07090e;
  --bg-secondary: #0d121f;
  --bg-card: rgba(18, 24, 38, 0.7);
  --bg-card-hover: rgba(28, 38, 58, 0.85);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(59, 130, 246, 0.5);

  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-faint: #64748b;

  --accent-blue: #3b82f6;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-violet: #8b5cf6;

  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --max-w: 1200px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(59, 130, 246, 0.12) 0%, transparent 60%),
    radial-gradient(circle at 100% 40%, rgba(139, 92, 246, 0.08) 0%, transparent 40%);
}

.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(7, 9, 14, 0.75);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
}

.brand-icon {
  width: 28px;
  height: 28px;
  color: var(--accent-blue);
}

.brand-text {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

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

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

.main-nav a:hover {
  color: var(--text-main);
}

.btn-nav {
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent-blue) !important;
  border: 1px solid rgba(59, 130, 246, 0.3);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease !important;
}

.btn-nav:hover {
  background: var(--accent-blue);
  color: #fff !important;
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.4);
}

/* Hero Section */
.hero-section {
  padding: 6rem 0 4rem;
  text-align: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 860px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--accent-emerald);
  padding: 0.4rem 1rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 2rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.9); }
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.text-gradient {
  background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-cyan) 50%, var(--accent-emerald) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 720px;
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent-blue);
  color: #fff;
  border: 1px solid transparent;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
  background: #2563eb;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-2px);
}

.btn-icon {
  width: 18px;
  height: 18px;
}

/* Sections */
.section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  max-width: 650px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  color: var(--accent-blue);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* Cards & Grid */
.grid {
  display: grid;
  gap: 1.75rem;
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2.25rem;
  transition: all 0.25s ease;
  backdrop-filter: blur(12px);
}

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

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.card-icon svg {
  width: 24px;
  height: 24px;
}

.card-icon.blue { background: rgba(59, 130, 246, 0.15); color: var(--accent-blue); }
.card-icon.emerald { background: rgba(16, 185, 129, 0.15); color: var(--accent-emerald); }
.card-icon.violet { background: rgba(139, 92, 246, 0.15); color: var(--accent-violet); }

.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.card-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Product Cards */
.product-card {
  display: flex;
  flex-direction: column;
}

.product-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-blue);
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

.product-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.product-domain {
  margin-bottom: 1rem;
}

.product-domain code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.product-desc {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.product-link-wrapper {
  margin-top: auto;
}

.product-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent-blue);
  font-weight: 600;
  text-decoration: none;
  transition: gap 0.2s ease;
}

.product-link svg {
  width: 16px;
  height: 16px;
}

.product-link:hover {
  color: #60a5fa;
  gap: 0.75rem;
}

/* Metrics Section */
.metrics-section {
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(13, 18, 31, 0.4);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2.5rem;
  text-align: center;
}

.metric-val {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
}

.metric-label {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

/* Footer */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  padding: 3.5rem 0 2rem;
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.footer-brand {
  max-width: 400px;
}

.footer-logo {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 0.5rem;
}

.footer-tagline {
  color: var(--text-faint);
  font-size: 0.9rem;
}

.footer-nav {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
}

.footer-nav a:hover {
  color: var(--text-main);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-faint);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero-title { font-size: 2.25rem; }
  .hero-subtitle { font-size: 1.05rem; }
  .main-nav { display: none; }
}