/* --------------------------------------------------
   ThinkNote - Premium Notes App
   Modern Play Store-Ready Stylesheet
----------------------------------------------------- */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
  /* Brand Palette (Deep violet & soft slate) */
  --primary: #7c3aed;
  --primary-hover: #6d28d9;
  --primary-light: #f5f3ff;
  --primary-glow: rgba(124, 58, 237, 0.15);
  
  --secondary: #06b6d4;
  --secondary-hover: #0891b2;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --border-light: #e2e8f0;
  --border-focus: #cbd5e1;
  
  --success: #10b981;
  --danger: #ef4444;
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 20px 25px -5px rgba(124, 58, 237, 0.08), 0 10px 10px -5px rgba(124, 58, 237, 0.03);
  
  --max-width: 1200px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark mode preferences support */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #111827;
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --border-light: #334155;
    --border-focus: #475569;
    
    --primary-light: #2e1065;
    --primary-glow: rgba(139, 92, 246, 0.25);
    
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Helper accessibility class */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Typography elements */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  letter-spacing: -0.02em;
}

h3 {
  font-size: clamp(1.3rem, 2vw, 1.8rem);
  letter-spacing: -0.01em;
}

p {
  color: var(--text-secondary);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition-fast);
}

a:hover {
  text-decoration: underline;
}

/* Accessible focus ring */
*:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 4px;
}

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

/* Custom Scrollbar styling */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Navbar / Header */
.header {
  position: sticky;
  top: 0;
  width: 100%;
  background-color: rgba(var(--bg-primary-rgb, 255, 255, 255), 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  z-index: 100;
  transition: var(--transition-fast);
}

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

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--text-primary);
  text-decoration: none;
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-sm);
  color: #ffffff;
  font-weight: 800;
  font-size: 1.25rem;
}

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

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

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  text-decoration: none;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1.25rem;
  font-weight: 600;
  font-size: 0.9rem;
  background-color: var(--text-primary);
  color: var(--bg-primary);
  border-radius: var(--radius-full);
  transition: var(--transition-normal);
}

.nav-cta:hover {
  background-color: var(--primary);
  color: #ffffff;
  text-decoration: none;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

.menu-toggle:hover {
  background-color: var(--bg-tertiary);
}

/* Hero Section */
.hero {
  position: relative;
  padding: 5rem 0 6rem;
  text-align: center;
  background: radial-gradient(circle at top, var(--primary-glow), transparent 70%);
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background-color: var(--primary-light);
  border: 1px solid var(--primary-glow);
  border-radius: var(--radius-full);
  color: var(--primary);
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

.hero-title {
  margin-bottom: 1.5rem;
  line-height: 1.15;
}

.hero-title span {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.875rem 2rem;
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-md);
  transition: var(--transition-normal);
  cursor: pointer;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
  border: 1px solid var(--primary);
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.25);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
  transform: translateY(-2px);
  text-decoration: none;
}

.btn-secondary {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--border-focus);
  transform: translateY(-2px);
  text-decoration: none;
}

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

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 4rem;
}

.section-label {
  color: var(--primary);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
  display: block;
}

.section-title {
  margin-bottom: 1rem;
}

.section-subtitle {
  color: var(--text-secondary);
}

.grid-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.feature-card {
  background-color: var(--bg-primary);
  padding: 2.5rem 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-focus);
}

.feature-icon-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  background-color: var(--primary-light);
  border-radius: var(--radius-md);
  color: var(--primary);
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.feature-card h3 {
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
}

/* Policy / Trust Section */
.trust-banner {
  padding: 5rem 0;
  background-color: var(--bg-primary);
}

.trust-card {
  padding: 3.5rem;
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
  flex-wrap: wrap;
}

.trust-content {
  flex: 1 1 500px;
}

.trust-content h3 {
  margin-bottom: 1rem;
  font-size: 1.75rem;
}

.trust-content p {
  margin-bottom: 2rem;
  font-size: 1.05rem;
}

.trust-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Contact / Support Section */
.contact {
  padding: 6rem 0;
  text-align: center;
  background-color: var(--bg-secondary);
}

.contact-card {
  max-width: 650px;
  background-color: var(--bg-primary);
  margin: 0 auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  padding: 3rem 2rem;
  box-shadow: var(--shadow-md);
}

.contact-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: inline-block;
  color: var(--primary);
}

.contact-card h2 {
  margin-bottom: 1rem;
}

.contact-card p {
  margin-bottom: 2rem;
  font-size: 1.1rem;
}

.contact-action {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-light);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  max-width: 100%;
}

.contact-email {
  font-weight: 600;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text-primary);
  word-break: break-all;
}

.btn-clipboard {
  background: none;
  border: none;
  color: var(--primary);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  font-weight: 600;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

.btn-clipboard:hover {
  background-color: var(--primary-light);
}

/* Static compliance / legal policies container */
.legal-layout {
  padding: 4rem 0 6rem;
  background-color: var(--bg-primary);
}

.legal-header {
  margin-bottom: 3.5rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 2.5rem;
}

.legal-meta {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 0.5rem;
}

.legal-content {
  max-width: 800px;
  margin: 0 auto;
}

.legal-content section {
  margin-bottom: 3rem;
}

.legal-content h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.legal-content h3 {
  font-size: 1.25rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.legal-content p, 
.legal-content ul, 
.legal-content ol {
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.65;
}

.legal-content ul, 
.legal-content ol {
  padding-left: 2rem;
}

.legal-content li {
  margin-bottom: 0.5rem;
}

.legal-highlight-box {
  background-color: var(--bg-secondary);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.legal-highlight-box p {
  color: var(--text-primary);
  margin-bottom: 0;
  font-weight: 500;
}

/* Footer styling */
.footer {
  background-color: var(--bg-tertiary);
  border-top: 1px solid var(--border-light);
  padding: 4rem 0 3rem;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-primary);
}

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

.footer-link {
  color: var(--text-secondary);
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

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

.footer-divider {
  border: none;
  border-top: 1px solid var(--border-light);
  margin-bottom: 2rem;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

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

.footer-compliance-disclaimer {
  color: var(--text-muted);
  font-size: 0.85rem;
  max-width: 600px;
  line-height: 1.4;
}

/* Animations with IntersectionObserver */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Support for user accessibility settings */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* Responsive Overrides */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  
  .nav-menu {
    position: fixed;
    top: 4.5rem;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-primary);
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: 3rem;
    gap: 2rem;
    transform: translateX(100%);
    transition: var(--transition-normal);
    border-top: 1px solid var(--border-light);
  }
  
  .nav-menu.active {
    transform: translateX(0);
  }
  
  .nav-cta {
    width:calc(100% - 3rem);
    text-align: center;
  }
  
  .trust-card {
    text-align: center;
    justify-content: center;
    padding: 2.5rem 1.5rem;
  }
  
  .trust-actions {
    justify-content: center;
    width: 100%;
  }
  
  .grid-features {
    grid-template-columns: 1fr;
  }
  
  .footer-nav {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 1rem;
  }
}