/* ===================================
   Sleepmate Website - Mobile-First CSS
   ================================= */

/* CSS Custom Properties for Mobile */
:root {
  /* Mobile-optimized spacing */
  --mobile-space-xs: 0.25rem;   /* 4px */
  --mobile-space-sm: 0.5rem;    /* 8px */
  --mobile-space-md: 1rem;      /* 16px */
  --mobile-space-lg: 1.5rem;    /* 24px */
  --mobile-space-xl: 2rem;      /* 32px */
  --mobile-space-2xl: 2.5rem;   /* 40px */
  --mobile-space-3xl: 3rem;     /* 48px */
  
  /* Mobile-optimized typography */
  --mobile-font-xs: 0.75rem;    /* 12px */
  --mobile-font-sm: 0.875rem;   /* 14px */
  --mobile-font-base: 1rem;     /* 16px - prevents zoom on iOS */
  --mobile-font-lg: 1.125rem;   /* 18px */
  --mobile-font-xl: 1.25rem;    /* 20px */
  --mobile-font-2xl: 1.5rem;    /* 24px */
  --mobile-font-3xl: 1.875rem;  /* 30px */
  --mobile-font-4xl: 2.25rem;   /* 36px */
  
  /* Touch target sizes */
  --touch-target-min: 44px;
  --touch-target-comfortable: 48px;
  
  /* Mobile header height */
  --mobile-header-height: 60px;
  
  /* Safe area insets for notched devices */
  --safe-area-top: env(safe-area-inset-top);
  --safe-area-bottom: env(safe-area-inset-bottom);
  --safe-area-left: env(safe-area-inset-left);
  --safe-area-right: env(safe-area-inset-right);
}

/* ===================================
   MOBILE-FIRST BASE STYLES
   ================================= */

/* Prevent horizontal overflow */
html {
  overflow-x: hidden;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

body {
  overflow-x: hidden;
  width: 100%;
  min-height: 100vh;
  min-height: calc(100vh - var(--safe-area-top) - var(--safe-area-bottom));
  font-size: var(--mobile-font-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Prevent body scroll when mobile menu is open */
body.nav-open {
  overflow: hidden;
  position: fixed;
  width: 100%;
}

/* ===================================
   MOBILE NAVIGATION
   ================================= */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--mobile-header-height);
  z-index: 1000;
  background: rgba(15, 20, 25, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--safe-area-top);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 var(--mobile-space-md);
  height: var(--mobile-header-height);
  max-width: 100%;
}

.logo {
  font-size: var(--mobile-font-xl);
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  z-index: 1001;
}

/* Mobile Navigation Toggle */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: var(--touch-target-comfortable);
  height: var(--touch-target-comfortable);
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
  position: relative;
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  margin: 3px 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  transform-origin: center;
}

/* Hamburger animation */
.nav-toggle.active .hamburger:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

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

.nav-toggle.active .hamburger:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Navigation Menu */
.nav-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--primary-bg);
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  padding: calc(var(--mobile-header-height) + var(--safe-area-top) + var(--mobile-space-lg)) var(--mobile-space-md) var(--mobile-space-lg);
  overflow-y: auto;
  z-index: 999;
}

.nav-menu.active {
  transform: translateX(0);
}

.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--mobile-space-md);
}

.nav-link {
  display: block;
  padding: var(--mobile-space-md) var(--mobile-space-lg);
  font-size: var(--mobile-font-lg);
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 12px;
  transition: all 0.2s ease;
  min-height: var(--touch-target-min);
  display: flex;
  align-items: center;
}

.nav-link:hover,
.nav-link:focus,
.nav-link.active {
  color: var(--text-primary);
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.3);
}

/* Navigation Overlay */
.nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 998;
}

.nav-menu.active + .nav-overlay {
  opacity: 1;
  visibility: visible;
}

/* Language Switcher in Mobile Menu */
.nav-language-switcher {
  margin-top: var(--mobile-space-xl);
  padding-top: var(--mobile-space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ===================================
   MOBILE LAYOUT FIXES
   ================================= */

/* Container adjustments */
.container {
  padding: 0 var(--mobile-space-md);
  max-width: 100%;
  margin: 0 auto;
}

/* Main content spacing */
main {
  padding-top: calc(var(--mobile-header-height) + var(--safe-area-top));
  min-height: calc(100vh - var(--mobile-header-height) - var(--safe-area-top));
}

/* ===================================
   MOBILE TYPOGRAPHY
   ================================= */

h1, .hero-title {
  font-size: var(--mobile-font-4xl);
  line-height: 1.1;
  margin-bottom: var(--mobile-space-md);
}

h2 {
  font-size: var(--mobile-font-3xl);
  line-height: 1.2;
  margin-bottom: var(--mobile-space-md);
}

h3 {
  font-size: var(--mobile-font-2xl);
  line-height: 1.3;
  margin-bottom: var(--mobile-space-sm);
}

.hero-subtitle {
  font-size: var(--mobile-font-lg);
  line-height: 1.5;
  margin-bottom: var(--mobile-space-lg);
}

/* ===================================
   MOBILE BUTTONS & FORMS
   ================================= */

.btn {
  min-height: var(--touch-target-comfortable);
  padding: 12px var(--mobile-space-lg);
  font-size: var(--mobile-font-base);
  font-weight: 600;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--mobile-space-sm);
  min-width: var(--touch-target-min);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

.btn-primary:active {
  transform: scale(0.98);
  box-shadow: 0 2px 8px rgba(139, 92, 246, 0.4);
}

.btn-secondary {
  background: var(--card-bg);
  color: var(--text-primary);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(10px);
}

.btn-outline {
  background: transparent;
  color: var(--accent-primary);
  border: 2px solid var(--accent-primary);
}

/* Form inputs */
.form-input,
.email-input {
  width: 100%;
  min-height: var(--touch-target-comfortable);
  padding: 12px var(--mobile-space-md);
  font-size: var(--mobile-font-base); /* Prevents zoom on iOS */
  border-radius: 12px;
  border: 2px solid var(--input-border);
  background: var(--input-bg);
  color: var(--text-primary);
  transition: all 0.2s ease;
}

.form-input:focus,
.email-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
  background: rgba(255, 255, 255, 0.1);
}

/* ===================================
   MOBILE CARD COMPONENTS
   ================================= */

.card {
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: var(--mobile-space-lg);
  margin-bottom: var(--mobile-space-lg);
  transition: all 0.3s ease;
}

.features-card {
  max-width: 100%;
  margin: 0 auto var(--mobile-space-xl);
  padding: var(--mobile-space-lg);
}

/* ===================================
   MOBILE HERO SECTION
   ================================= */

.hero-section {
  padding: var(--mobile-space-3xl) 0;
  text-align: center;
  min-height: auto;
}

.hero-content {
  max-width: 100%;
  margin: 0 auto;
}

.phone-showcase {
  margin: var(--mobile-space-xl) 0;
}

.phone-container {
  max-width: 280px;
  margin: 0 auto;
}

/* ===================================
   MOBILE FEATURES SECTION
   ================================= */

.features-section {
  padding: var(--mobile-space-2xl) 0;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: var(--mobile-space-md);
  margin-bottom: var(--mobile-space-lg);
  padding: var(--mobile-space-md);
  background: rgba(255, 255, 255, 0.03);
  border-radius: 12px;
  transition: all 0.3s ease;
}

.feature-item:last-child {
  margin-bottom: 0;
}

.feature-bullet {
  font-size: var(--mobile-font-xl);
  line-height: 1;
  margin-top: 2px;
  flex-shrink: 0;
}

.feature-text {
  font-size: var(--mobile-font-base);
  line-height: 1.5;
  color: var(--text-secondary);
}

/* ===================================
   MOBILE QUIZ SECTION
   ================================= */

.quiz-option {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: var(--mobile-space-md) var(--mobile-space-lg);
  margin-bottom: var(--mobile-space-md);
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
  color: var(--text-primary);
  font-size: var(--mobile-font-base);
  line-height: 1.5;
  min-height: var(--touch-target-min);
  display: flex;
  align-items: center;
}

.quiz-option:hover,
.quiz-option:focus {
  background: var(--card-bg-hover);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.2);
}

.quiz-option.selected {
  background: rgba(139, 92, 246, 0.15);
  border-color: var(--accent-primary);
  color: var(--text-primary);
  box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.3);
}

/* ===================================
   MOBILE TESTIMONIALS
   ================================= */

.testimonials-carousel {
  position: relative;
  overflow: hidden;
  max-width: 100%;
  margin: 0 auto;
  min-height: 400px;
}

.testimonials-container {
  display: flex;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
  height: 100%;
  min-height: 400px;
}

.testimonial-card {
  flex: 0 0 100%;
  min-width: 100%;
  width: 100%;
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: var(--mobile-space-lg);
  text-align: center;
  transition: all 0.5s ease;
  box-sizing: border-box;
  display: block;
  visibility: visible;
  min-height: 350px;
}

/* ===================================
   MOBILE FAQ SECTION
   ================================= */

.faq-item {
  margin-bottom: var(--mobile-space-md);
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-question {
  width: 100%;
  padding: var(--mobile-space-md) var(--mobile-space-lg);
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: var(--mobile-font-base);
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.3s ease;
  min-height: var(--touch-target-min);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item.open .faq-answer {
  max-height: 200px;
}

/* ===================================
   MOBILE FORM LAYOUTS
   ================================= */

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--mobile-space-sm);
  margin-bottom: var(--mobile-space-md);
}

.email-signup-form {
  max-width: 100%;
  margin: 0 auto;
}

/* Stack form elements vertically on mobile */
.form-group {
  flex-direction: column;
}

.form-group .btn {
  width: 100%;
  margin-top: var(--mobile-space-sm);
}

/* ===================================
   MOBILE PERFORMANCE OPTIMIZATIONS
   ================================= */

/* Mobile-specific navigation fixes */
@media (max-width: 767px) {
  /* Force mobile navigation styles to override responsive.css */
  .nav-menu {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    background: var(--primary-bg) !important;
    transform: translateX(-100%) !important;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    padding: calc(var(--mobile-header-height) + var(--safe-area-top) + var(--mobile-space-lg)) var(--mobile-space-md) var(--mobile-space-lg) !important;
    overflow-y: auto !important;
    z-index: 999 !important;
    height: 100vh !important;
    max-height: 100vh !important;
  }
  
  .nav-menu.active {
    transform: translateX(0) !important;
  }
  
  /* Ensure navigation links container is visible and properly styled */
  .nav-links {
    list-style: none !important;
    margin: 0 !important;
    padding: 0 !important;
    display: flex !important;
    flex-direction: column !important;
    gap: var(--mobile-space-md) !important;
    width: 100% !important;
    height: auto !important;
    min-height: auto !important;
  }
  
  .nav-links li {
    display: block !important;
    width: 100% !important;
    opacity: 1 !important;
    visibility: visible !important;
    position: static !important;
  }
  
  .nav-link {
    display: flex !important;
    align-items: center !important;
    padding: var(--mobile-space-md) var(--mobile-space-lg) !important;
    font-size: var(--mobile-font-lg) !important;
    font-weight: 500 !important;
    color: var(--text-secondary) !important;
    text-decoration: none !important;
    border-radius: 12px !important;
    transition: all 0.2s ease !important;
    min-height: var(--touch-target-min) !important;
    background: rgba(255, 255, 255, 0.05) !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
    margin-bottom: var(--mobile-space-sm) !important;
    width: 100% !important;
    box-sizing: border-box !important;
    opacity: 1 !important;
    visibility: visible !important;
    position: static !important;
    transform: none !important;
  }
  
  .nav-link:hover,
  .nav-link:focus,
  .nav-link.active {
    color: var(--text-primary) !important;
    background: rgba(139, 92, 246, 0.1) !important;
    border: 1px solid rgba(139, 92, 246, 0.3) !important;
  }
  
  /* Debug: Force all navigation links to be visible */
  .nav-menu.active .nav-links,
  .nav-menu.active .nav-links li,
  .nav-menu.active .nav-link {
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
  }
  
  /* Reduce animations on mobile for better performance */
  * {
    animation-duration: 0.2s !important;
    transition-duration: 0.2s !important;
  }
  
  /* Disable complex animations on mobile */
  .animate-fade-in-up,
  .animate-slide-in-up,
  .animate-pulse {
    animation: none !important;
  }
}

/* GPU acceleration for smooth animations */
.nav-menu,
.nav-toggle,
.testimonials-container,
.quiz-option {
  transform: translateZ(0);
  will-change: transform;
}

/* Optimize scroll performance */
.scroll-container {
  -webkit-overflow-scrolling: touch;
  overflow-scrolling: touch;
}

/* ===================================
   MOBILE ACCESSIBILITY
   ================================= */

/* Focus indicators */
.nav-link:focus,
.btn:focus,
.form-input:focus,
.quiz-option:focus,
.faq-question:focus {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .card,
  .form-input,
  .btn {
    border-width: 2px;
  }
  
  .nav-link:focus,
  .btn:focus,
  .form-input:focus {
    outline-width: 3px;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .nav-menu,
  .testimonials-container {
    transition: none !important;
  }
}

/* ===================================
   MOBILE UTILITIES
   ================================= */

/* Hide desktop elements on mobile */
.desktop-only {
  display: none !important;
}

/* Show mobile elements only */
.mobile-only {
  display: block !important;
}

/* Mobile text alignment */
.mobile-text-center {
  text-align: center;
}

.mobile-text-left {
  text-align: left;
}

/* Mobile spacing utilities */
.mobile-mt-0 { margin-top: 0 !important; }
.mobile-mt-sm { margin-top: var(--mobile-space-sm) !important; }
.mobile-mt-md { margin-top: var(--mobile-space-md) !important; }
.mobile-mt-lg { margin-top: var(--mobile-space-lg) !important; }

.mobile-mb-0 { margin-bottom: 0 !important; }
.mobile-mb-sm { margin-bottom: var(--mobile-space-sm) !important; }
.mobile-mb-md { margin-bottom: var(--mobile-space-md) !important; }
.mobile-mb-lg { margin-bottom: var(--mobile-space-lg) !important; }

.mobile-p-0 { padding: 0 !important; }
.mobile-p-sm { padding: var(--mobile-space-sm) !important; }
.mobile-p-md { padding: var(--mobile-space-md) !important; }
.mobile-p-lg { padding: var(--mobile-space-lg) !important; }