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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: #333;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: 1rem 0;
  transition: all 0.3s ease;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.5rem;
  color: #2962FF;
}

.logo-img {
  width: 32px;
  height: 32px;
}

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

.nav-link {
  text-decoration: none;
  color: #333;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-link:hover {
  color: #2962FF;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: #2962FF;
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.bar {
  width: 25px;
  height: 3px;
  background: #333;
  margin: 3px 0;
  transition: 0.3s;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.floating-shapes {
  position: absolute;
  width: 100%;
  height: 100%;
}

.shape {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  animation: float 6s ease-in-out infinite;
}

.shape-1 {
  width: 80px;
  height: 80px;
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.shape-2 {
  width: 120px;
  height: 120px;
  top: 60%;
  right: 10%;
  animation-delay: 2s;
}

.shape-3 {
  width: 60px;
  height: 60px;
  top: 80%;
  left: 20%;
  animation-delay: 4s;
}

.shape-4 {
  width: 100px;
  height: 100px;
  top: 10%;
  right: 30%;
  animation-delay: 1s;
}

.shape-5 {
  width: 40px;
  height: 40px;
  top: 40%;
  left: 60%;
  animation-delay: 3s;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(180deg); }
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-content {
  color: white;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.gradient-text {
  background: linear-gradient(45deg, #FFD700, #FFA500);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn-primary {
  background: linear-gradient(45deg, #FFD700, #FFA500);
  color: #333;
  box-shadow: 0 4px 15px rgba(255, 215, 0, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 215, 0, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn-icon {
  width: 20px;
  height: 20px;
}

/* Phone Mockup */
.phone-mockup {
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-screen {
  width: 280px;
  height: 560px;
  background: #1a1a1a;
  border-radius: 30px;
  padding: 20px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  position: relative;
  overflow: hidden;
}

.app-preview {
  width: 100%;
  height: 100%;
  background: #f8f9fa;
  border-radius: 20px;
  overflow: hidden;
  position: relative;
}

.app-header {
  background: #2962FF;
  padding: 10px 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.app-status-bar {
  width: 60px;
  height: 4px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 2px;
}

.app-nav {
  display: flex;
  gap: 4px;
}

.nav-dot {
  width: 8px;
  height: 8px;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 50%;
}

.app-content {
  padding: 20px;
}

.expense-card {
  background: white;
  border-radius: 12px;
  padding: 15px;
  margin-bottom: 15px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.expense-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.expense-title {
  font-weight: 600;
  color: #333;
}

.expense-amount {
  font-weight: 700;
  color: #2962FF;
  font-size: 1.1rem;
}

.expense-details {
  display: flex;
  gap: 8px;
}

.member-avatar {
  width: 30px;
  height: 30px;
  background: #e0e0e0;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}

.settlement-card {
  background: linear-gradient(135deg, #4CAF50, #45a049);
  border-radius: 12px;
  padding: 15px;
  color: white;
}

.settlement-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.settlement-amount {
  font-weight: 700;
  font-size: 1.1rem;
}

.settlement-progress {
  margin-top: 10px;
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  width: 75%;
  height: 100%;
  background: white;
  border-radius: 3px;
  animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
  0%, 100% { width: 75%; }
  50% { width: 85%; }
}

/* Features Section */
.features {
  padding: 100px 0;
  background: #f8f9fa;
}

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

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: #333;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.25rem;
  color: #666;
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: white;
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.feature-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, #2962FF, #768FFF);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  color: white;
}

.feature-icon svg {
  width: 40px;
  height: 40px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: #333;
  margin-bottom: 1rem;
}

.feature-description {
  color: #666;
  line-height: 1.6;
}

/* How It Works Section */
.how-it-works {
  padding: 100px 0;
  background: white;
}

.steps-container {
  display: flex;
  flex-direction: column;
  gap: 3rem;
  max-width: 800px;
  margin: 0 auto;
}

.step {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 2rem;
  background: #f8f9fa;
  border-radius: 16px;
  transition: all 0.3s ease;
}

.step:hover {
  transform: translateX(10px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.step:nth-child(even) {
  flex-direction: row-reverse;
}

.step-number {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, #2962FF, #768FFF);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
  font-weight: 700;
  flex-shrink: 0;
}

.step-content h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: #333;
  margin-bottom: 0.5rem;
}

.step-content p {
  color: #666;
  line-height: 1.6;
}

/* Download Section */
.download {
  padding: 100px 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  text-align: center;
  color: white;
}

.download-content h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.download-content p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.download-buttons {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.download-btn {
  transition: transform 0.3s ease;
}

.download-btn:hover {
  transform: translateY(-5px);
}

.download-btn img {
  height: 60px;
}

/* Footer */
.footer {
  background: #1a1a1a;
  color: white;
  padding: 60px 0 20px;
}

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

.footer-section h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: #FFD700;
}

.footer-section a {
  display: block;
  color: #ccc;
  text-decoration: none;
  margin-bottom: 0.5rem;
  transition: color 0.3s ease;
}

.footer-section a:hover {
  color: #FFD700;
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-link {
  color: #ccc;
  text-decoration: none;
  transition: color 0.3s ease;
}

.social-link:hover {
  color: #FFD700;
}

.footer-bottom {
  border-top: 1px solid #333;
  padding-top: 2rem;
  text-align: center;
  color: #999;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background-color: white;
    width: 100%;
    text-align: center;
    transition: 0.3s;
    box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
    padding: 2rem 0;
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active .bar:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }

  .nav-toggle.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-buttons {
    justify-content: center;
  }

  .phone-screen {
    width: 240px;
    height: 480px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .step {
    flex-direction: column;
    text-align: center;
  }

  .step:nth-child(even) {
    flex-direction: column;
  }

  .download-buttons {
    flex-direction: column;
    align-items: center;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .btn {
    padding: 0.8rem 1.5rem;
    font-size: 0.9rem;
  }
}

/* Animation Classes */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Smooth scrolling for anchor links */
html {
  scroll-behavior: smooth;
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
  background: #2962FF;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #1e4bd8;
}