:root {
  /* Colors */
  --bg-primary: #000000;
  --bg-secondary: #0b0b0b;
  --bg-card: #111111;
  --bg-card-hover: #161616;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-active: rgba(59, 130, 246, 0.35);

  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-primary-glow: rgba(59, 130, 246, 0.25);
  --color-primary-light: #60a5fa;

  --color-accent: #f59e0b;
  --color-success: #10b981;
  --color-purple: #8b5cf6;

  --text-primary: #ffffff;
  --text-secondary: #a0aec0;
  --text-muted: #4a5568;

  /* Typography */
  --font-display: 'Outfit', sans-serif;
  --font-sans: 'Plus Jakarta Sans', sans-serif;

  /* Transitions */
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  overflow-x: hidden;
  line-height: 1.6;
}

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

/* Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: #222;
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
  background: #333;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 600;
  border-radius: 9999px;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition-smooth);
  border: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
  box-shadow: 0 4px 20px var(--color-primary-glow);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-2px);
}

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

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-2px);
}

.btn-tertiary {
  background-color: transparent;
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-tertiary:hover {
  color: white;
  background-color: rgba(255, 255, 255, 0.06);
  transform: translateY(-2px);
}

.btn-whatsapp {
  background-color: #25d366;
  color: white;
  padding: 0.8rem 1.8rem;
  box-shadow: 0 4px 20px rgba(37, 211, 102, 0.25);
}

.btn-whatsapp:hover {
  background-color: #20ba5a;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 1rem 2.2rem;
  font-size: 1.1rem;
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition-smooth);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.2rem 1.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -0.5px;
}

.logo-icon {
  color: var(--color-primary);
  font-size: 1.5rem;
  text-shadow: 0 0 15px var(--color-primary-glow);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

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

.nav-links a:hover {
  color: white;
}

.nav-cta {
  padding: 0.5rem 1.5rem;
  font-size: 0.9rem;
}

/* Hero Section */
.hero {
  padding-top: 8rem;
  padding-bottom: 5rem;
  position: relative;
  background-image: radial-gradient(circle at 70% 30%, rgba(59, 130, 246, 0.08) 0%, transparent 60%);
}

.hero-container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 4rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.badge {
  align-self: flex-start;
  background-color: var(--color-primary-glow);
  color: var(--color-primary-light);
  border: 1px solid var(--border-color-active);
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-display);
}

.hero-content h1 {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  background: linear-gradient(135deg, white 60%, var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-content p {
  color: var(--text-secondary);
  font-size: 1.15rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.hero-meta {
  display: flex;
  gap: 2rem;
  margin-top: 1.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.hero-meta span {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-image {
  position: relative;
  display: flex;
  justify-content: center;
}

.image-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 120%;
  height: 120%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, transparent 60%);
  z-index: 1;
  pointer-events: none;
}

.mockup-img {
  max-width: 100%;
  height: auto;
  border-radius: 2rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8);
  position: relative;
  z-index: 2;
  border: 1px solid var(--border-color);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* Features Section */
.features {
  padding: 6rem 0;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-title-wrap {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -1px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-top: 0.5rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.feature-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1.5rem;
  padding: 2.2rem;
  transition: var(--transition-smooth);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-color-active);
  background-color: var(--bg-card-hover);
  box-shadow: 0 10px 30px rgba(59, 130, 246, 0.03);
}

.feature-icon-wrap {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
}

.bg-blue { background-color: rgba(59, 130, 246, 0.1); color: var(--color-primary-light); }
.bg-purple { background-color: rgba(139, 92, 246, 0.1); color: var(--color-purple); }
.bg-amber { background-color: rgba(245, 158, 11, 0.1); color: var(--color-accent); }
.bg-green { background-color: rgba(16, 185, 129, 0.1); color: var(--color-success); }

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Demo Section */
.demo-section {
  padding: 6rem 0;
  position: relative;
}

.demo-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 4rem;
}

.demo-info {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.eyebrow {
  color: var(--color-primary-light);
  font-weight: 700;
  text-transform: uppercase;
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 1.5px;
}

.demo-info h2 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -1px;
}

.demo-info p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.7;
}

.gesture-tip {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-accent);
  font-weight: 500;
  font-size: 0.95rem;
  margin-top: 1rem;
}

.demo-visual {
  display: flex;
  justify-content: center;
}

/* 3D Flip Card */
.card-3d-container {
  width: 280px;
  height: 480px;
  perspective: 1000px;
}

.card-3d {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  cursor: pointer;
}

.card-3d.is-flipped {
  transform: rotateY(180deg);
}

/* Hover rotation fallback if js fails */
.card-3d-container:hover .card-3d {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 2rem;
  border: 2px dashed rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  box-shadow: 0 15px 35px rgba(0,0,0,0.5);
}

.card-front {
  background: radial-gradient(circle at top left, #1a202c, #000000);
}

.card-back {
  background: radial-gradient(circle at bottom right, #2d3748, #000000);
  transform: rotateY(180deg);
}

.card-inner-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.card-inner-content i {
  font-size: 4rem;
  color: var(--color-primary);
}

.card-inner-content h4 {
  font-size: 1.4rem;
  font-family: var(--font-display);
  font-weight: 700;
}

.card-inner-content span {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* About / Developer Section */
.about-section {
  padding: 6rem 0;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 4rem;
  align-items: center;
}

.about-main h2 {
  font-family: var(--font-display);
  font-size: 2.2rem;
  margin-bottom: 1rem;
}

.about-main p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.contact-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.contact-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.5rem 1.2rem;
  border-radius: 9999px;
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition-smooth);
}

.contact-pill:hover {
  border-color: var(--color-primary);
  color: white;
  background-color: var(--color-primary-glow);
}

.about-support {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1.5rem;
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.about-support h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
}

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

/* Download Section */
.download-section {
  padding: 6rem 0;
  text-align: center;
}

.download-card {
  position: relative;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 2.5rem;
  padding: 4rem 2rem;
  max-width: 900px;
  margin: 0 auto;
  overflow: hidden;
}

.download-bg-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80%;
  height: 80%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.08) 0%, transparent 60%);
  z-index: 1;
}

.download-card h2 {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 1rem;
  position: relative;
  z-index: 2;
}

.download-card p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  font-size: 1.1rem;
  position: relative;
  z-index: 2;
}

.download-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  position: relative;
  z-index: 2;
  flex-wrap: wrap;
}

.download-meta {
  font-size: 0.85rem !important;
  color: var(--text-muted) !important;
  margin-top: 1rem !important;
}

/* Footer */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0;
}

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

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

.footer-link {
  color: var(--color-primary-light);
  text-decoration: none;
  font-weight: 500;
}

.footer-link:hover {
  text-decoration: underline;
}

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

/* Responsive Queries */
@media (max-width: 992px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }
  
  .hero-content h1 {
    font-size: 2.8rem;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .hero-meta {
    justify-content: center;
  }
  
  .badge {
    align-self: center;
  }
  
  .demo-layout {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }
  
  .gesture-tip {
    justify-content: center;
  }
  
  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .nav-links {
    display: none; /* Hide nav links on simple mobile layouts */
  }
}

@media (max-width: 576px) {
  .hero-content h1 {
    font-size: 2.2rem;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .btn-lg {
    width: 100%;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
    gap: 1.5rem;
  }
  
  .download-card {
    padding: 3rem 1rem;
  }
  
  .download-card h2 {
    font-size: 2rem;
  }
}