/* ============================================
   AI Baby Sleep Optimizer - Main Stylesheet
   Sleep-friendly, mobile-first design
   ============================================ */

/* ============================================
   CSS Variables - Design System
   ============================================ */
:root {
  /* Sleep-friendly Color Palette */
  --color-primary: #6B9BD1;
  /* Soft blue */
  --color-primary-dark: #4A7BA7;
  --color-secondary: #F4E4D7;
  /* Warm neutral */
  --color-accent: #FFB88C;
  /* Gentle peach */
  --color-success: #A8D5BA;
  /* Soft green */

  /* Neutrals */
  --color-bg: #FAF9F7;
  /* Off-white background */
  --color-card: #FFFFFF;
  --color-text: #2D3436;
  /* Soft black */
  --color-text-light: #636E72;
  /* Gray text */
  --color-border: #E8E5E1;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);

  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'Roboto', sans-serif;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;
  --font-size-3xl: 40px;

  --line-height-tight: 1.3;
  --line-height-base: 1.6;
  --line-height-relaxed: 1.8;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

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

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

a:hover {
  color: var(--color-primary-dark);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
}

/* ============================================
   Typography
   ============================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

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

h2 {
  font-size: var(--font-size-2xl);
}

h3 {
  font-size: var(--font-size-xl);
}

p {
  margin-bottom: var(--spacing-sm);
  line-height: var(--line-height-relaxed);
}

.text-center {
  text-align: center;
}

.text-light {
  color: var(--color-text-light);
}

.text-sm {
  font-size: var(--font-size-sm);
}

.text-lg {
  font-size: var(--font-size-lg);
}

/* ============================================
   Layout Components
   ============================================ */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-sm {
  max-width: 600px;
}

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

.section-lg {
  padding: 64px 0;
}

/* ============================================
   Card Component
   ============================================ */
.card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  margin-bottom: var(--spacing-md);
}

.card-body {
  margin-bottom: var(--spacing-md);
}

.card-footer {
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
}

/* ============================================
   Button Component
   ============================================ */
.btn {
  display: inline-block;
  padding: 16px 32px;
  font-size: var(--font-size-base);
  font-weight: 600;
  text-align: center;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  min-height: 48px;
  min-width: 120px;
  cursor: pointer;
  border: none;
  outline: none;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-sm);
}

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

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--color-secondary);
  color: var(--color-text);
}

.btn-secondary:hover {
  background: #E8D4C3;
}

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

.btn-outline:hover {
  background: var(--color-primary);
  color: white;
}

.btn-block {
  width: 100%;
  display: block;
}

.btn-lg {
  padding: 20px 40px;
  font-size: var(--font-size-lg);
  min-height: 56px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ============================================
   Form Elements
   ============================================ */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--color-text);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 14px 16px;
  font-size: var(--font-size-base);
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
  min-height: 48px;
}

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

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-help {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

/* Radio buttons - larger touch targets */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.radio-option {
  display: flex;
  align-items: center;
  padding: 16px;
  background: var(--color-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 56px;
}

.radio-option:hover {
  border-color: var(--color-primary);
  background: var(--color-secondary);
}

.radio-option input[type="radio"] {
  margin-right: var(--spacing-sm);
  width: 20px;
  height: 20px;
  cursor: pointer;
}

.radio-option.selected {
  border-color: var(--color-primary);
  background: var(--color-secondary);
}

/* ============================================
   Progress Indicator
   ============================================ */
.progress-container {
  margin-bottom: var(--spacing-lg);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-dark));
  border-radius: var(--radius-full);
  transition: width 400ms ease;
}

.progress-text {
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  text-align: center;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  text-align: center;
  padding: var(--spacing-xl) 0;
  background: linear-gradient(135deg, #F0F4F8 0%, var(--color-bg) 100%);
}

.hero-title {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

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

.hero-emoji {
  font-size: 64px;
  margin-bottom: var(--spacing-md);
}

/* ============================================
   Trust Indicators
   ============================================ */
.trust-badges {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  margin: var(--spacing-lg) 0;
}

.trust-badge {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm);
  background: var(--color-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  font-size: var(--font-size-sm);
}

.trust-badge-icon {
  font-size: 20px;
}

/* ============================================
   Testimonials
   ============================================ */
.testimonial {
  background: var(--color-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-md);
}

.testimonial-text {
  font-style: italic;
  margin-bottom: var(--spacing-sm);
  line-height: var(--line-height-relaxed);
}

.testimonial-author {
  font-weight: 600;
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

/* ============================================
   Alert/Notice Components
   ============================================ */
.alert {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  border-left: 4px solid;
}

.alert-info {
  background: #E8F4F8;
  border-color: var(--color-primary);
  color: #2D5F7E;
}

.alert-success {
  background: #E8F5E9;
  border-color: var(--color-success);
  color: #2E5A3B;
}

.alert-warning {
  background: #FFF3E0;
  border-color: #FFB88C;
  color: #7A4F2E;
}

/* ============================================
   Loading Spinner
   ============================================ */
.spinner-container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-xl);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ============================================
   Blur Effect (for payment preview)
   ============================================ */
.blur-overlay {
  position: relative;
  overflow: hidden;
}

.blur-overlay::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  backdrop-filter: blur(8px);
  background: rgba(255, 255, 255, 0.3);
  z-index: 1;
}

.unlock-message {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  text-align: center;
  background: var(--color-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* ============================================
   Timeline Component (for sleep schedule)
   ============================================ */
.timeline {
  position: relative;
  padding-left: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-md);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -20px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-bg);
}

.timeline-time {
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
}

.timeline-content {
  color: var(--color-text);
}

/* ============================================
   FAQ Accordion
   ============================================ */
.faq-item {
  background: var(--color-card);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: var(--spacing-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 56px;
}

.faq-question:hover {
  background: var(--color-secondary);
}

.faq-answer {
  padding: 0 var(--spacing-md) var(--spacing-md);
  display: none;
  line-height: var(--line-height-relaxed);
}

.faq-answer.active {
  display: block;
}

.faq-icon {
  transition: transform var(--transition-base);
}

.faq-icon.active {
  transform: rotate(180deg);
}

/* ============================================
   Quiz Steps - Progressive Disclosure
   ============================================ */
.quiz-step {
  display: none;
}

.quiz-step.active {
  display: block;
}

/* ============================================
   Hero Image
   ============================================ */
.hero-image {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  margin: var(--spacing-lg) auto;
  box-shadow: var(--shadow-lg);
}

/* ============================================
   Utility Classes
   ============================================ */
.hidden {
  display: none !important;
}

.mt-0 {
  margin-top: 0;
}

.mt-1 {
  margin-top: var(--spacing-xs);
}

.mt-2 {
  margin-top: var(--spacing-sm);
}

.mt-3 {
  margin-top: var(--spacing-md);
}

.mt-4 {
  margin-top: var(--spacing-lg);
}

.mb-0 {
  margin-bottom: 0;
}

.mb-1 {
  margin-bottom: var(--spacing-xs);
}

.mb-2 {
  margin-bottom: var(--spacing-sm);
}

.mb-3 {
  margin-bottom: var(--spacing-md);
}

.mb-4 {
  margin-bottom: var(--spacing-lg);
}

.py-4 {
  padding-top: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
}

/* ============================================
   Responsive Design - Mobile First
   ============================================ */

/* Tablet */
@media (min-width: 768px) {
  :root {
    --font-size-3xl: 48px;
    --font-size-2xl: 36px;
  }

  .container {
    padding: 0 var(--spacing-lg);
  }

  .radio-group {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .radio-option {
    flex: 1;
    min-width: 200px;
  }
}

/* Desktop */
@media (min-width: 1024px) {
  :root {
    --font-size-3xl: 56px;
  }

  .hero {
    padding: 80px 0;
  }

  .section-lg {
    padding: 96px 0;
  }
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 400ms ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ============================================
   Version B Landing Page Styles
   ============================================ */
.hero-v2 {
  background-image: url('../images/hero.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
  padding: 100px 0 120px;
  text-align: center;
  color: white;
}

/* Dark overlay for readability */
.hero-v2::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 0;
}

.hero-v2 .container {
  position: relative;
  z-index: 1;
}

.hero-headline {
  font-size: 2.5rem;
  line-height: 1.2;
  color: white;
  margin-bottom: 16px;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subhead {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.95);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.5;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.microcopy {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.8);
  margin-top: 12px;
}

/* Depth Preview Section */
.preview-card {
  position: relative;
  background: white;
  border: 1px solid #E2E8F0;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 24px;
  text-align: left;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.preview-header {
  padding: 16px;
  background: #F8FAFC;
  border-bottom: 1px solid #E2E8F0;
  font-weight: 700;
  color: #2D3748;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
}

.preview-content {
  padding: 24px;
  filter: blur(5px);
  user-select: none;
  opacity: 0.5;
  background: white;
}

.lock-overlay {
  position: absolute;
  top: 60%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: white;
  padding: 12px 24px;
  border-radius: 50px;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
  font-weight: 600;
  color: #2D3748;
  white-space: nowrap;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid #E2E8F0;
}

/* Tonight List */
.tonight-list {
  text-align: left;
  max-width: 500px;
  margin: 0 auto;
}

.tonight-item {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  font-size: 1.15rem;
  color: #2D3748;
  align-items: flex-start;
}

.check-icon {
  color: #48BB78;
  font-weight: bold;
  font-size: 1.25rem;
  margin-top: -2px;
}

@media (min-width: 768px) {
  .hero-v2 {
    text-align: center;
    padding: 140px 0 180px;
    background-position: center 25%;
  }

  .hero-v2 .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-left: 20px;
    padding-right: 20px;
  }

  .hero-headline {
    font-size: 4rem;
    line-height: 1.15;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-subhead {
    margin-left: auto;
    margin-right: auto;
    font-size: 1.5rem;
    max-width: 800px;
  }

  /* Ensure button is center aligned on desktop */
  .hero-v2 .btn {
    margin-left: auto !important;
    margin-right: auto !important;
  }
}

.slide-in {
  animation: slideIn 400ms ease;
}

/* ============================================
   Print Styles (for PDF)
   ============================================ */
@media print {
  body {
    background: white;
  }

  .no-print {
    display: none !important;
  }

  .card {
    box-shadow: none;
    border: 1px solid var(--color-border);
  }
}