/* Main CSS File for All Sleep Calculators Calculator */

/* ======== CSS Reset and Base Styles ======== */
:root {
  /* Color palette - Updated for a cute, modern aesthetic */
  --primary-color: #7e5ffa; /* Soft purple */
  --primary-dark: #6247d9; /* Darker purple */
  --primary-light: #b3a1ff; /* Light purple */
  --secondary-color: #ff6b9d; /* Soft pink */
  --accent-color: #00d4d4; /* Turquoise */
  --btn-primary-color: #ca81ce; /* Light purple */
  --btn-secondary-color: #8f38cb; /* Light purple */
  --card-background-color: #f8fafc;
  
  /* Neutral colors */
  --text-color: #333;
  --text-light: #666;
  --background-color: #fff;
  --background-alt: #f8f6ff; /* Soft purple tinted background */
  --border-color: #e9e4ff; /* Light purple border */
  
  /* Status colors */
  --success-color: #77dd77; /* Softer green */
  --warning-color: #ffcc5c; /* Softer orange */
  --error-color: #ff7066; /* Softer red */
  
  /* Dark mode colors */
  --dark-background: #1a182d; /* Deep purple-blue */
  --dark-surface: #252442; /* Slightly lighter purple-blue */
  --dark-text: #e8e6ff; /* Light purple-white */
  --dark-text-light: #b3a1ff; /* Light purple */
  --dark-border: #413c7a; /* Medium purple */
  
  /* Typography */
  --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', sans-serif;
  --font-family-heading: 'Montserrat', var(--font-family-base);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Border radius */
  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 1rem;
  
  /* Transitions */
  --transition-quick: 0.15s ease;
  --transition-medium: 0.3s ease;
  
  /* Container width */
  --container-max-width: 1200px;
  --container-padding: 1rem;
}

/* Dark mode theme */
.dark-mode {
  --text-color: var(--dark-text);
  --text-light: var(--dark-text-light);
  --background-color: var(--dark-background);
  --background-alt: var(--dark-surface);
  --border-color: var(--dark-border);

  --card-background-color: #151625;
}

/* Star background for dark mode */
body.dark-mode {
  background-image: radial-gradient(circle, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
  background-size: 50px 50px;
  position: relative;
  overflow-x: hidden;
}

body.dark-mode::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  background-image: radial-gradient(circle, rgba(255, 255, 255, 0.2) 1px, transparent 1px),
                    radial-gradient(circle, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
  background-size: 80px 80px, 40px 40px;
  animation: twinkle 15s ease infinite alternate;
}

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

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  color: var(--text-color);
  background-color: var(--background-color);
  line-height: 1.6;
  transition: background-color var(--transition-medium), color var(--transition-medium);
  overflow-x: hidden; /* Prevent horizontal scroll from animations */
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  font-weight: 700;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: 2rem;
  margin-bottom: var(--spacing-lg);
}

h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
}

p {
  margin-bottom: var(--spacing-md);
}

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

a:hover, a:focus {
  color: var(--primary-dark);
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

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

section {
  padding: var(--spacing-2xl) 0;
}

.section-description {
  font-size: 1.2rem;
  color: var(--text-light);
  max-width: 800px;
  margin: 0 auto var(--spacing-xl);
  text-align: center;
}

/* ======== Header Styles ======== */
.site-header {
  background-color: var(--background-color);
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: all var(--transition-medium);
  border-bottom: 1px solid rgba(126, 95, 250, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.dark-mode .site-header {
  background-color: rgba(26, 24, 45, 0.8);
  border-bottom: 1px solid rgba(65, 60, 122, 0.5);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
}

.logo {
  display: flex;
  align-items: center;
}

.logo a {
  display: flex;
  flex-direction: column;
  text-decoration: none;
}

.logo-text {
  font-family: var(--font-family-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.logo-tagline {
  font-size: 0.9rem;
  color: var(--text-light);
}

.main-nav ul {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
}

.main-nav li {
  margin-left: var(--spacing-lg);
}

.main-nav a {
  color: var(--text-color);
  font-weight: 500;
  padding: var(--spacing-sm) 0;
  position: relative;
}

.main-nav a:hover {
  text-decoration: none;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: width var(--transition-quick);
}

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 100%;
}

#dark-mode-toggle {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm);
  border-radius: 50%;
  transition: background-color var(--transition-quick);
}

#dark-mode-toggle:hover {
  background-color: var(--background-alt);
}

.dark-mode .sun-icon {
  display: none;
}

.dark-mode .moon-icon {
  display: block;
}

.sun-icon {
  display: block;
}

.moon-icon {
  display: none;
}

/* ======== Footer Styles ======== */
.site-footer {
  background-color: var(--background-alt);
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-2xl);
  transition: background-color var(--transition-medium);
  position: relative;
  overflow: hidden;
  border-top: 1px solid rgba(126, 95, 250, 0.1);
}

.site-footer::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 150px;
  background: linear-gradient(to top, rgba(126, 95, 250, 0.03), transparent);
  pointer-events: none;
}

.dark-mode .site-footer {
  background-color: var(--dark-surface);
  border-top: 1px solid rgba(65, 60, 122, 0.3);
}

.dark-mode .site-footer::before {
  background: linear-gradient(to top, rgba(126, 95, 250, 0.05), transparent);
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  margin-bottom: var(--spacing-xl);
}

.footer-logo {
  display: flex;
  flex-direction: column;
  margin-bottom: var(--spacing-lg);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2xl);
}

.footer-nav-section h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
}

.footer-nav-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-nav-section li {
  margin-bottom: var(--spacing-sm);
}

.copyright {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  color: var(--text-light);
  font-size: 0.9rem;
}

.copyright p {
  margin-bottom: var(--spacing-sm);
}

/* ======== Button Styles ======== */
.btn {
  display: inline-block;
  font-weight: 500;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  line-height: 1.5;
  border-radius: 50px; /* Rounded buttons */
  transition: all 0.3s ease;
  text-decoration: none;
  border: 2px solid transparent;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: -100%;
  background: linear-gradient(90deg, rgba(255,255,255,0) 0%, rgba(255,255,255,0.2) 50%, rgba(255,255,255,0) 100%);
  transition: all 0.6s ease;
}

.btn:hover::after {
  left: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  border: none;
  transform: translateY(0);
}

.btn-primary:hover, .btn-primary:focus {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
  color: white;
  text-decoration: none;
  transform: translateY(-3px);
  box-shadow: 0 7px 20px rgba(126, 95, 250, 0.3);
}

.cta-section .btn-primary {
  background: linear-gradient(135deg, var(--btn-primary-color), var(--btn-secondary-color));
}

.btn-outline {
  background-color: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
  box-shadow: none;
  transition: all 0.3s ease;
}

.btn-outline:hover, .btn-outline:focus {
  background-color: rgba(126, 95, 250, 0.1);
  color: var(--primary-dark);
  text-decoration: none;
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(126, 95, 250, 0.2);
}

.btn-large {
  padding: 0.75rem 1.5rem;
  font-size: 1.1rem;
}

/* ======== Home Page Styles ======== */
.hero {
  padding: var(--spacing-2xl) 0;
  background-color: var(--background-color);
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid rgba(126, 95, 250, 0.1);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(126, 95, 250, 0.05) 0%, rgba(255, 107, 157, 0.05) 100%);
  z-index: -1;
}

.dark-mode .hero {
  border-bottom: 1px solid rgba(65, 60, 122, 0.3);
}

.dark-mode .hero::before {
  background: linear-gradient(135deg, rgba(126, 95, 250, 0.1) 0%, rgba(255, 107, 157, 0.1) 100%);
}

/* Adding floating animation to hero */
.hero-image img {
  animation: float 6s ease-in-out infinite;
  border-radius: 1rem;
}

@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-15px); }
  100% { transform: translateY(0px); }
}

.hero .container {
  display: flex;
  align-items: center;
  gap: var(--spacing-2xl);
}

.hero-content {
  flex: 1;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-light);
  margin-bottom: var(--spacing-lg);
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.features {
  background-color: var(--background-alt);
  padding: var(--spacing-2xl) 0;
}

.features h2 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.feature-card {
  background-color: var(--background-color);
  border-radius: 20px;
  padding: var(--spacing-xl);
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
  transition: all 0.4s ease;
  border: 1px solid rgba(126, 95, 250, 0.1);
  position: relative;
  overflow: hidden;
}

.dark-mode .feature-card {
  background-color: rgba(37, 36, 66, 0.5);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  border: 1px solid rgba(126, 95, 250, 0.2);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  width: calc(100% + 4px);
  height: calc(100% + 4px);
  background: linear-gradient(45deg, transparent, transparent, transparent, var(--primary-light));
  z-index: -1;
  transform: rotate(0deg);
  transition: all 0.6s ease;
  opacity: 0;
  border-radius: 20px;
}

.feature-card:hover {
  transform: translateY(-7px) scale(1.02);
  box-shadow: 0 15px 30px rgba(126, 95, 250, 0.15);
}

.feature-card:hover::before {
  opacity: 1;
  transform: rotate(180deg);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.how-it-works {
  padding: var(--spacing-2xl) 0;
}

.how-it-works h2 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.steps {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.step {
  flex: 1;
  min-width: 250px;
  text-align: center;
  padding: var(--spacing-lg);
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  font-weight: bold;
  font-size: 1.5rem;
  margin: 0 auto var(--spacing-md);
  box-shadow: 0 5px 15px rgba(126, 95, 250, 0.3);
  position: relative;
}

.step-number::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  border: 2px dashed rgba(255, 255, 255, 0.3);
  animation: spin 15s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.action-center {
  text-align: center;
  margin-top: var(--spacing-xl);
}

.sleep-science {
  background-color: var(--background-alt);
  padding: var(--spacing-2xl) 0;
}

.sleep-science .container {
  display: flex;
  align-items: center;
  gap: var(--spacing-2xl);
}

.science-content {
  flex: 3;
}

.science-image {
  flex: 2;
  display: flex;
  justify-content: center;
}

.sleep-stages {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.sleep-stage {
  flex: 1;
  min-width: 200px;
  background-color: var(--background-color);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-md);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.testimonials {
  padding: var(--spacing-2xl) 0;
}

.testimonials h2 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.testimonial-slider {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xl);
  justify-content: center;
}

.testimonial {
  flex: 1;
  min-width: 300px;
  max-width: 400px;
  background-color: var(--background-color);
  padding: var(--spacing-lg);
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  position: relative;
  border: 1px solid rgba(126, 95, 250, 0.1);
  transition: all 0.3s ease;
  transform: scale(1);
}

.testimonial:hover {
  transform: scale(1.03);
  box-shadow: 0 15px 40px rgba(126, 95, 250, 0.15);
}

.dark-mode .testimonial {
  background-color: rgba(37, 36, 66, 0.5);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  border: 1px solid rgba(126, 95, 250, 0.2);
}

.testimonial::before {
  content: '"';
  position: absolute;
  top: 10px;
  left: 15px;
  font-size: 3rem;
  color: var(--primary-light);
  opacity: 0.3;
  font-family: Georgia, serif;
}

.testimonial-quote {
  position: relative;
  z-index: 1;
  padding-left: var(--spacing-md);
}

.testimonial-author {
  margin-top: var(--spacing-md);
  text-align: right;
}

.author-name {
  font-weight: 600;
  color: var(--primary-color);
}

.cta-section {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  text-align: center;
  padding: var(--spacing-2xl) 0;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.2) 0%, transparent 50%),
                    radial-gradient(circle at 80% 70%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  z-index: 0;
}

.cta-section .container {
  position: relative;
  z-index: 1;
}

.cta-section h2 {
  color: white;
}

.cta-section .btn-primary {
  color: #fff;
  border-color: white;
}

.cta-section .btn-primary:hover,
.cta-section .btn-primary:focus {
  background-color: var(--background-color);
  border-color: var(--background-color);
}

/* ======== Calculator Page Styles ======== */
.calculator-section {
  padding: var(--spacing-2xl) 0;
}

.calculator-container {
  max-width: 800px;
  margin: 0 auto;
  background-color: var(--card-background-color);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

.calculator-tabs {
  display: flex;
  background-color: var(--background-alt);
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  flex: 1;
  padding: var(--spacing-md);
  text-align: center;
  background: none;
  border: none;
  cursor: pointer;
  font-weight: 500;
  color: var(--text-color);
  transition: background-color var(--transition-quick);
  border-bottom: 3px solid transparent;
}

.tab-btn:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

.tab-btn.active {
  border-bottom-color: var(--primary-color);
  color: var(--primary-color);
}

.calculator-forms {
  padding: var(--spacing-xl);
}

.calculator-form {
  display: none;
}

.calculator-form.active {
  display: block;
}

.form-intro {
  margin-bottom: var(--spacing-lg);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
}

.form-group input {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  font-size: 1rem;
  background-color: var(--background-color);
  color: var(--text-color);
  transition: border-color var(--transition-quick);
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary-color);
}

.slider-container {
  margin-top: var(--spacing-md);
}

.slider-container input[type="range"] {
  width: 100%;
  padding: 0;
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  margin-top: var(--spacing-xs);
  font-size: 0.9rem;
  color: var(--text-light);
}

.form-actions {
  margin-top: var(--spacing-xl);
  text-align: center;
}

.results-container {
  padding: var(--spacing-xl);
  border-top: 1px solid var(--border-color);
  background-color: var(--background-alt);
}

.results-container h2 {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.result-summary {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.result-card {
  flex: 1;
  min-width: 200px;
  padding: var(--spacing-lg);
  background-color: var(--background-color);
  border-radius: var(--border-radius-md);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  text-align: center;
}

.result-card.primary {
  border-left: 4px solid var(--primary-color);
}

.result-card.secondary {
  border-left: 4px solid var(--accent-color);
}

.result-value {
  font-size: 1.8rem;
  font-weight: 700;
  margin: var(--spacing-sm) 0;
  color: var(--primary-color);
}

.result-details {
  margin-bottom: var(--spacing-xl);
}

.result-detail-item {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-color);
}

.result-recommendation {
  background-color: var(--background-color);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-md);
  border-left: 4px solid var(--success-color);
}

.options-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--spacing-md);
}

.table-header, .table-row {
  display: flex;
  padding: var(--spacing-sm) 0;
}

.table-header {
  font-weight: 600;
  border-bottom: 2px solid var(--border-color);
}

.table-row {
  border-bottom: 1px solid var(--border-color);
}

.table-row.recommended {
  background-color: rgba(57, 73, 171, 0.05);
}

.table-cell {
  flex: 1;
  padding: var(--spacing-sm);
  text-align: center;
}

.quality-poor {
  color: var(--error-color);
}

.quality-fair {
  color: var(--warning-color);
}

.quality-good, .quality-optimal {
  color: var(--success-color);
}

.error-message, .form-error-container {
  color: var(--error-color);
  padding: var(--spacing-md);
  background-color: rgba(244, 67, 54, 0.1);
  border-radius: var(--border-radius-md);
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.form-group.has-error input,
.form-group.has-error select {
  border-color: var(--error-color);
}

.input-error {
  color: var(--error-color);
  font-size: 0.85rem;
  margin-top: var(--spacing-xs);
  display: block;
}

.sleep-info, .sleep-tips {
  padding: var(--spacing-2xl) 0;
}

.sleep-info h2, .sleep-tips h2 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.info-content {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2xl);
  align-items: center;
}

.info-text {
  flex: 3;
  min-width: 300px;
}

.info-graphic {
  flex: 2;
  min-width: 300px;
  display: flex;
  justify-content: center;
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.tip-card {
  background-color: var(--background-color);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-md);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  text-align: center;
}

.tip-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

/* ======== About Page Styles ======== */
.about-hero {
  background-color: var(--primary-color);
  color: white;
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.about-hero h1, .about-hero .section-description {
  color: white;
}

.about-content {
  padding: var(--spacing-2xl) 0;
}

.content-section {
  margin-bottom: var(--spacing-2xl);
}

.content-with-image {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2xl);
  align-items: center;
  margin: var(--spacing-lg) 0;
}

.content-text {
  flex: 3;
  min-width: 300px;
}

.content-image {
  flex: 2;
  min-width: 300px;
  display: flex;
  justify-content: center;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.benefit-card {
  background-color: var(--background-alt);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-md);
  border-left: 4px solid var(--primary-color);
}

.calculator-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.feature {
  background-color: var(--background-alt);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-md);
}

.limitations-list {
  background-color: var(--background-alt);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-md);
  margin: var(--spacing-lg) 0;
}

/* ======== Error Pages ======== */
.error-page {
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.error-page .container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.error-page h1 {
  font-size: 6rem;
  margin-bottom: var(--spacing-md);
  color: var(--primary-color);
}

.error-image {
  margin: var(--spacing-xl) 0;
}

/* ======== Share Options ======== */
.share-options {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

.share-options h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
}

.share-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.share-btn {
  display: flex;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--background-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-quick);
}

.share-btn:hover {
  background-color: var(--background-alt);
  border-color: var(--primary-color);
}

.share-btn .icon {
  margin-right: var(--spacing-sm);
}

/* Toast notifications */
.toast-notification {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
}

.toast-item {
  padding: 12px 16px;
  border-radius: var(--border-radius-md);
  background-color: var(--background-color);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  font-size: 0.9rem;
  max-width: 300px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.3s, transform 0.3s;
}

.toast-item.show {
  opacity: 1;
  transform: translateY(0);
}

.toast-success {
  border-left: 4px solid var(--success-color);
}

.toast-error {
  border-left: 4px solid var(--error-color);
}

.toast-info {
  border-left: 4px solid var(--primary-color);
}

/* Print styles */
@media print {
  .site-header,
  .site-footer,
  .calculator-tabs,
  .share-options,
  .sleep-info,
  .weekly-planner-section,
  .sleep-tips,
  .form-actions,
  #dark-mode-toggle,
  .visualization-section {
    display: none !important;
  }
  
  .results-container {
    box-shadow: none;
    border: none;
  }
  
  body {
    padding: 0;
    margin: 0;
  }
  
  .container {
    max-width: 100%;
    padding: 0;
  }
}

/* ======== Accessibility Styles ======== */
.skip-to-content {
  position: absolute;
  top: -40px;
  left: 0;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--primary-color);
  color: white;
  z-index: 1000;
  transition: top 0.2s ease;
  text-decoration: none;
}

.skip-to-content:focus {
  top: 0;
}

#main-content:focus {
  outline: none;
}

:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* High contrast mode support */
@media (forced-colors: active) {
  :root {
    --primary-color: CanvasText;
    --border-color: CanvasText;
    --background-color: Canvas;
  }
  
  .btn,
  .tab-btn,
  .share-btn {
    forced-color-adjust: none;
    background-color: ButtonFace;
    color: ButtonText;
    border: 1px solid ButtonText;
  }
  
  .btn:hover,
  .tab-btn:hover,
  .share-btn:hover {
    forced-color-adjust: none;
    background-color: Highlight;
    color: HighlightText;
  }
  
  .tab-btn.active {
    border-bottom-color: Highlight;
    color: Highlight;
  }
}

/* ======== Responsive Styles ======== */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .hero .container,
  .sleep-science .container,
  .about-content .content-with-image {
    flex-direction: column;
  }
  
  .hero-image,
  .science-image,
  .content-image {
    margin-top: var(--spacing-xl);
  }
  
  .footer-content {
    flex-direction: column;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: var(--spacing-lg);
  }
}

/* ======== Animations ======== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.5s ease forwards;
}

/* ======== Utility Classes ======== */
.text-center {
  text-align: center;
}

.hidden {
  display: none;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }