/* ==========================================================================
   dot2.sh — Class-A Design System & Style Core
   Architecture: Charli x PawCare design language & MUI component ergonomics
   - Poppins & Space Grotesk headline weights, 12px squares, 100px pill buttons
   - 0.1s ease-out micro-interactions
   - Strict WCAG 2.4.11 / 4.5:1 contrast ratios
   ========================================================================== */

:root {
  /* Surfaces & Canvas */
  --bg-canvas: #07090e;
  --bg-surface: rgba(17, 24, 39, 0.72);
  --bg-surface-elevated: #151d2f;
  --bg-code: #05070c;
  
  /* Brand Accents */
  --primary-blue: #3b82f6;
  --primary-blue-hover: #2563eb;
  --primary-blue-glow: rgba(59, 130, 246, 0.28);
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-rose: #f43f5e;
  
  /* Borders (Subtle: card grouping | Strong: control affordance) */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.18);
  --border-focus: rgba(59, 130, 246, 0.65);
  
  /* Typography Ink */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-dim: #64748b;
  
  /* Geometry & Motion (PawCare / Charli Standards) */
  --radius-square: 12px;
  --radius-pill: 100px;
  --radius-circle: 50%;
  --ease-snappy: all 0.1s ease-out;
  --ease-smooth: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  
  /* Elevation Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.6);
  --shadow-focus: 0 0 0 3px rgba(59, 130, 246, 0.5);
}

/* Base Resets */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  min-height: 100%;
  font-family: 'Poppins', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: 
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(59, 130, 246, 0.15), transparent 70%),
    radial-gradient(circle at 95% 30%, rgba(6, 182, 212, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 5% 80%, rgba(244, 63, 94, 0.05) 0%, transparent 35%);
}

/* Header & Glass Navbar */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(7, 9, 14, 0.85);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.9rem 1.5rem;
}

.app-header__container {
  max-width: 1240px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-wordmark {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
  color: #fff;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

/* Badges / Chips */
.chip {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-pill);
  transition: var(--ease-snappy);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.chip--blue {
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.35);
}

.chip--cyan {
  background: rgba(6, 182, 212, 0.15);
  color: #22d3ee;
  border: 1px solid rgba(6, 182, 212, 0.35);
}

/* Nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: var(--ease-snappy);
  cursor: pointer;
}

.nav-link:hover {
  color: var(--text-primary);
}

/* Buttons (PawCare `.button--round` & `.button--square` Architecture) */
.button {
  font-family: 'Poppins', sans-serif;
  border: none;
  cursor: pointer;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  text-decoration: none;
  transition: var(--ease-snappy);
  font-size: 0.95rem;
  padding: 0.8rem 1.6rem;
}

.button--round {
  border-radius: var(--radius-pill);
}

.button--square {
  border-radius: var(--radius-square);
}

.button--primary {
  background: var(--primary-blue);
  color: #fff;
  box-shadow: 0 4px 18px var(--primary-blue-glow);
}

.button--primary:hover {
  background: var(--primary-blue-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 22px rgba(59, 130, 246, 0.38);
}

.button--outline {
  background: rgba(17, 24, 39, 0.7);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  backdrop-filter: blur(8px);
}

.button--outline:hover {
  background: rgba(23, 32, 51, 0.9);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

.button:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

/* Hero Content */
.hero-wrapper {
  text-align: center;
  max-width: 860px;
  margin: 3.5rem auto 3.5rem;
}

.hero-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2.4rem, 5.5vw, 4rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.04em;
  margin-bottom: 1.25rem;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #ffffff 30%, #38bdf8 70%, var(--primary-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lede {
  color: var(--text-secondary);
  font-size: clamp(1.05rem, 2vw, 1.22rem);
  line-height: 1.65;
  margin: 0 auto 2.25rem;
  max-width: 720px;
}

/* Card System */
.card {
  background: var(--bg-surface);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-square);
  padding: 2rem;
  transition: var(--ease-smooth);
}

.card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Pricing Grid */
.pricing-card {
  display: flex;
  flex-direction: column;
  position: relative;
  background: var(--bg-surface);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 2.5rem;
  transition: var(--ease-smooth);
}

.pricing-card.featured {
  border-color: var(--primary-blue);
  box-shadow: 0 0 35px var(--primary-blue-glow);
  background: linear-gradient(180deg, rgba(23, 32, 51, 0.88) 0%, var(--bg-surface) 100%);
}

.pricing-card .price-tag {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2.85rem;
  font-weight: 700;
  margin: 1.25rem 0 1.75rem;
  color: #fff;
}

.pricing-card .price-tag span {
  font-size: 1.05rem;
  color: var(--text-secondary);
  font-weight: 400;
}

/* Responsive Grid Patterns */
.layout-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

/* Footer & Attributions */
.app-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 2.5rem 1.5rem;
  background: #05070c;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: auto;
}

.footer-attribution {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.heart-pulsing {
  color: var(--accent-rose);
  display: inline-flex;
  align-items: center;
  animation: pulse-heart 2s infinite ease-in-out;
}

@keyframes pulse-heart {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.18); }
}

.codex-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-square);
  color: #fff;
  font-weight: 600;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.84rem;
}

/* Media Queries (MUI Breakpoints: 900px md, 600px sm) */
@media (max-width: 900px) {
  .app-header__container {
    flex-direction: column;
    gap: 1rem;
  }
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
  }
}

@media (max-width: 600px) {
  .hero-title { font-size: 2.2rem; }
  .hero-lede { font-size: 1rem; }
  .button { width: 100%; }
  .cta-group { flex-direction: column; }
}