:root {
  --primary: #0066ff;
  --primary-light: #3395ff;
  --primary-dark: #0052d9;
  --secondary: #8b5cf6;
  --accent: #00d4aa;
  --surface: #ffffff;
  --surface-elevated: #f8fafc;
  --surface-inverse: #0f172a;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 32px 80px rgba(0, 0, 0, 0.16);
  --blur: blur(20px);
  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.background-effects {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
}

.gradient-orbs {
  position: relative;
  width: 100%;
  height: 100%;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.4;
  animation: float 20s infinite linear;
}

.orb-1 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--primary-light) 0%, transparent 70%);
  top: -100px;
  left: -100px;
  animation-delay: 0s;
}

.orb-2 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--secondary) 0%, transparent 70%);
  bottom: -50px;
  right: -50px;
  animation-delay: -7s;
  animation-duration: 25s;
}

.orb-3 {
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
  top: 50%;
  left: 60%;
  animation-delay: -14s;
  animation-duration: 30s;
}

.grid-pattern {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(0, 102, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 102, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 70%);
}

@keyframes float {
  0%, 100% {
    transform: translate(0, 0) rotate(0deg) scale(1);
  }
  33% {
    transform: translate(30px, -20px) rotate(120deg) scale(1.1);
  }
  66% {
    transform: translate(-20px, 20px) rotate(240deg) scale(0.9);
  }
}

.navbar {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-bottom: 1px solid rgba(255, 255, 255, 0.9);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.store-logo {
  height: 36px;
  border-radius: var(--radius-sm);
}

.brand-text {
  font-size: 20px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.main-container {
  padding: 40px 24px;
  max-width: 1200px;
  margin: 0 auto;
  animation: slideUp 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.app-showcase {
  background: var(--surface);
  border-radius: var(--radius-xl);
  padding: 48px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.9);
  position: relative;
  overflow: hidden;
}

.app-showcase::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
  background-size: 200% 100%;
  animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
  0%, 100% { background-position: -200% 0; }
  50% { background-position: 200% 0; }
}

.app-hero {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 40px;
  margin-bottom: 40px;
  align-items: start;
}

.app-visual {
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: center;
}

.logo-frame {
  position: relative;
  display: inline-block;
}

.app-logo {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-lg);
  border: 3px solid var(--surface);
  box-shadow: var(--shadow-xl);
  transition: var(--transition);
}

.app-logo:hover {
  transform: scale(1.05) rotate(5deg);
  box-shadow: var(--shadow-lg);
}

.official-badge {
  position: absolute;
  top: -8px;
  right: -8px;
  background: linear-gradient(135deg, var(--accent), #00b894);
  color: white;
  font-size: 11px;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: var(--shadow);
}

.badge-dot {
  width: 6px;
  height: 6px;
  background: white;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.app-actions {
  display: flex;
  gap: 8px;
}

.icon-btn {
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  cursor: pointer;
  transition: var(--transition);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.app-details {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.app-title {
  font-size: 42px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.app-metrics {
  display: flex;
  gap: 24px;
}

.metric {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface-elevated);
  padding: 16px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  transition: var(--transition);
}

.metric:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--primary-light);
}

.metric-icon {
  font-size: 20px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.metric-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.metric-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.metric-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.app-tags {
  background: var(--surface-elevated);
  padding: 12px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
}

.app-specs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.spec-item {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--surface-elevated);
  padding: 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  transition: var(--transition);
}

.spec-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--primary-light);
}

.spec-icon {
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.spec-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.spec-label {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

.spec-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.download-actions {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.download-btn {
    position: relative;
    padding: 20px 24px;
    border: none;
    border-radius: var(--radius);
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    overflow: hidden;
    justify-content: center;
}

.download-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: var(--transition);
}

.download-btn:hover::before {
  left: 100%;
}

.primary-btn {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: var(--shadow);
}

.primary-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.secondary-btn {
  background: #00d4aa;
  color: #ffffff;
  border: 2px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.secondary-btn:hover {
  background: #00d4aa;
  transform: translateY(-3px);
  color: #ffffff;
  box-shadow: var(--shadow);
  border-color: var(--primary-light);
}

.btn-icon {
  display: flex;
  align-items: center;
}

.btn-badge {
  background: var(--accent);
  color: white;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
}

.info-section {
  margin-bottom: 32px;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.section-decorator {
  width: 4px;
  height: 24px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 2px;
}

.section-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
}

.content-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.content-text {
  line-height: 1.8;
  color: var(--text-secondary);
  font-size: 16px;
  margin: 0;
}

.footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  margin-top: 60px;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
  text-align: center;
}

.footer-copyright {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
}

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  transition: var(--transition-fast);
}

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

.floating-action-btn {
  position: fixed;
  bottom: 40px;
  right: 40px;
  background: linear-gradient(135deg, #ff0055, #f65ca0);
  color: white;
  border: none;
  border-radius: var(--radius-xl);
  padding: 16px 24px;
  font-size: 12px;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: var(--transition);
}

.floating-action-btn:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: var(--shadow-xl);
}

.fab-icon {
  display: flex;
  align-items: center;
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.8);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 2000;
  backdrop-filter: blur(8px);
  animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-container {
  background: var(--surface);
  border-radius: var(--radius-xl);
  width: 90%;
  max-width: 480px;
  box-shadow: var(--shadow-xl);
  animation: modalSlideIn 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  overflow: hidden;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(40px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 32px 32px 0;
  margin-bottom: 24px;
}

.modal-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  background: var(--surface-elevated);
  color: var(--text-primary);
}

.modal-form {
  padding: 0 32px 32px;
}

.input-group {
  margin-bottom: 20px;
}

.input-group input,
.input-group textarea {
  width: 100%;
  padding: 16px;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 16px;
  font-family: inherit;
  transition: var(--transition);
  resize: vertical;
}

.input-group input:focus,
.input-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
  background: var(--surface);
}

.input-group textarea {
  min-height: 120px;
}

.submit-button {
  width: 100%;
  padding: 18px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.submit-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.button-loader {
  display: none;
}

.alert-toast {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--surface-inverse);
  color: white;
  border-radius: var(--radius-lg);
  padding: 0;
  z-index: 3000;
  display: none;
  box-shadow: var(--shadow-xl);
  animation: toastPopIn 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes toastPopIn {
  from {
    opacity: 0;
    transform: translate(-50%, -40%) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

.alert-content {
  padding: 24px 32px;
  text-align: center;
}

@media (max-width: 768px) {
  .main-container {
    padding: 20px 16px;
  }
  
  .app-showcase {
    padding: 32px 24px;
  }
  
  .app-hero {
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
  }
  
  .app-title {
    font-size: 32px;
  }
  
  .app-metrics {
    justify-content: center;
  }
  
  .app-specs {
    grid-template-columns: 1fr;
  }
  
  .download-btn {
    padding: 18px 20px;
    font-size: 16px;
  }
  
  .modal-container {
    width: 95%;
    margin: 20px;
  }
  
  .modal-header,
  .modal-form {
    padding: 24px;
  }
  
  .floating-action-btn {
    bottom: 20px;
    right: -10px;
    padding: 5px 10px 5px 5px;
  }
}

@media (max-width: 480px) {
  .app-logo {
    width: 100px;
    height: 100px;
  }
  
  .app-title {
    font-size: 28px;
  }
  
  .app-metrics {
    flex-direction: column;
    align-items: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 12px;
  }
  
  .nav-container {
    padding: 0 16px;
  }
  
  .brand-text {
    font-size: 18px;
  }
}