/* LeafyAI Landing Page - Apple-inspired Design System */

/* CSS Variables - Design Tokens */
:root {
  /* Health Context Colors (Primary Palette) */
  --color-visual-light: #93C5FD;
  --color-visual-medium: #60A5FA;
  --color-visual-strong: #3B82F6;
  
  --color-care-light: #C4B5FD;
  --color-care-medium: #A78BFA;
  --color-care-strong: #8B5CF6;
  
  --color-environment-light: #6EE7B7;
  --color-environment-medium: #34C759;
  --color-environment-strong: #28A745;
  
  --color-symptoms-light: #F9A8D4;
  --color-symptoms-medium: #F472B6;
  --color-symptoms-strong: #EC4899;
  
  /* Care Activity Colors */
  --color-water-light: #BFDBFE;
  --color-water-medium: #87CEEB;
  --color-water-strong: #007AFF;
  
  --color-light-light: #FEF3C7;
  --color-light-medium: #FFFACD;
  --color-light-strong: #FFCC00;
  
  --color-soil-light: #E9D5FF;
  --color-soil-medium: #DDA0DD;
  --color-soil-strong: #8B5CF6;
  
  --color-temperature-light: #FDBA74;
  --color-temperature-medium: #FB923C;
  --color-temperature-strong: #FF9500;
  
  /* Neutral Colors */
  --color-text-primary: rgba(0, 0, 0, 0.9);
  --color-text-secondary: rgba(0, 0, 0, 0.6);
  --color-text-tertiary: rgba(0, 0, 0, 0.4);
  
  --color-bg-primary: #FFFFFF;
  --color-bg-secondary: #F8F9FA;
  --color-bg-tertiary: #F1F3F4;
  
  --color-border-primary: rgba(0, 0, 0, 0.08);
  --color-border-secondary: rgba(0, 0, 0, 0.06);
  
  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 30px;
  --font-size-4xl: 36px;
  --font-size-5xl: 48px;
  --font-size-6xl: 64px;
  
  --line-height-tight: 1.2;
  --line-height-base: 1.5;
  --line-height-relaxed: 1.6;
  
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.025em;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 20px;
  --spacing-2xl: 24px;
  --spacing-3xl: 32px;
  --spacing-4xl: 40px;
  --spacing-5xl: 48px;
  --spacing-6xl: 64px;
  --spacing-8xl: 96px;
  --spacing-10xl: 128px;
  
  /* Border Radius */
  --border-radius-sm: 6px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  --border-radius-2xl: 20px;
  --border-radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.25);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  
  /* Breakpoints */
  --mobile: 480px;
  --tablet: 768px;
  --desktop: 1024px;
  --large: 1200px;
}

/* Dark Mode Variables */
@media (prefers-color-scheme: dark) {
  :root {
    --color-text-primary: rgba(255, 255, 255, 0.9);
    --color-text-secondary: rgba(255, 255, 255, 0.6);
    --color-text-tertiary: rgba(255, 255, 255, 0.4);
    
    --color-bg-primary: #000000;
    --color-bg-secondary: rgba(255, 255, 255, 0.05);
    --color-bg-tertiary: rgba(255, 255, 255, 0.08);
    
    --color-border-primary: rgba(255, 255, 255, 0.12);
    --color-border-secondary: rgba(255, 255, 255, 0.08);
  }
}

/* Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Layout Components */
.container {
  max-width: var(--large);
  margin: 0 auto;
  padding-left: var(--spacing-lg);
  padding-right: var(--spacing-lg);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--spacing-2xl);
    padding-right: var(--spacing-2xl);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-left: var(--spacing-4xl);
    padding-right: var(--spacing-4xl);
  }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  margin-bottom: var(--spacing-lg);
}

h1 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

p {
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
}

.text-large {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
}

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

.text-xs {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
  font-weight: var(--font-weight-medium);
}

/* Header */
.header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-secondary);
  z-index: 50;
  transition: var(--transition-fast);
}

@media (prefers-color-scheme: dark) {
  .header {
    background: rgba(0, 0, 0, 0.8);
  }
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
  color: var(--color-text-primary);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--border-radius-md);
}

/* Navigation */
.nav {
  display: none;
  gap: var(--spacing-3xl);
}

@media (min-width: 768px) {
  .nav {
    display: flex;
  }
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: var(--transition-fast);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-environment-medium);
  transition: var(--transition-fast);
}

.nav-link:hover::after {
  width: 100%;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  border: none;
  border-radius: var(--border-radius-lg);
  cursor: pointer;
  transition: var(--transition-fast);
  min-height: 44px;
}

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

.btn-primary:hover {
  background: var(--color-environment-strong);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
  background: var(--color-bg-tertiary);
  border-color: var(--color-border-secondary);
}

.btn-large {
  padding: var(--spacing-lg) var(--spacing-3xl);
  font-size: var(--font-size-lg);
  border-radius: var(--border-radius-xl);
}

/* Hero Section */
.hero {
  padding: var(--spacing-10xl) 0 var(--spacing-8xl);
  text-align: center;
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
}

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

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-2xl);
  background: linear-gradient(135deg, var(--color-environment-medium), var(--color-care-medium));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: var(--font-size-6xl);
  }
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-4xl);
  line-height: var(--line-height-relaxed);
}

.hero-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  align-items: center;
}

@media (min-width: 480px) {
  .hero-buttons {
    flex-direction: row;
    justify-content: center;
  }
}

.app-store-badge {
  display: inline-block;
  height: 60px;
  transition: var(--transition-fast);
}

.app-store-badge:hover {
  transform: scale(1.05);
}

/* Section Styles */
.section {
  padding: var(--spacing-8xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-6xl);
}

.section-title {
  margin-bottom: var(--spacing-lg);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-3xl);
}

@media (min-width: 768px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  text-align: center;
  padding: var(--spacing-3xl);
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--color-border-secondary);
  transition: var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-border-primary);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-xl);
  background: var(--color-environment-light);
  border-radius: var(--border-radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  color: var(--color-environment-strong);
}

.feature-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.feature-description {
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* How It Works */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-4xl);
  max-width: 900px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .steps {
    grid-template-columns: repeat(3, 1fr);
  }
}

.step {
  text-align: center;
  position: relative;
}

.step-number {
  width: 60px;
  height: 60px;
  background: var(--color-care-medium);
  color: white;
  border-radius: var(--border-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin: 0 auto var(--spacing-xl);
}

.step-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-xl);
  background: var(--color-visual-light);
  border-radius: var(--border-radius-2xl);
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-icon svg {
  width: 40px;
  height: 40px;
  color: var(--color-visual-strong);
}

.step-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
}

.step-description {
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* Contact Section */
.contact {
  background: var(--color-bg-secondary);
}

.contact-content {
  max-width: 600px;
  margin: 0 auto;
}

.contact-form {
  display: grid;
  gap: var(--spacing-xl);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.form-label {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.form-input,
.form-select,
.form-textarea {
  padding: var(--spacing-lg);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--border-radius-lg);
  background: var(--color-bg-primary);
  font-size: var(--font-size-base);
  transition: var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-environment-medium);
  box-shadow: 0 0 0 3px rgba(52, 199, 89, 0.1);
}

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

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

@media (min-width: 768px) {
  .form-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

.form-error {
  color: var(--color-symptoms-strong);
  font-size: var(--font-size-sm);
}

.form-success {
  color: var(--color-environment-strong);
  font-size: var(--font-size-sm);
}

/* Footer */
.footer {
  background: var(--color-bg-tertiary);
  padding: var(--spacing-6xl) 0 var(--spacing-3xl);
  text-align: center;
}

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

.footer-logo {
  margin-bottom: var(--spacing-3xl);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-3xl);
}

.footer-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: var(--transition-fast);
}

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

.footer-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  margin-bottom: 0;
}

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

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mx-auto { margin-left: auto; margin-right: auto; }

.hidden { display: 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: 0;
}

/* Animation Classes */
.fade-in {
  opacity: 0;
  animation: fadeIn 0.6s ease-forward forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

.slide-up {
  transform: translateY(20px);
  opacity: 0;
  animation: slideUp 0.6s ease-forward forwards;
}

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

/* Loading States */
.loading {
  opacity: 0.6;
  pointer-events: none;
}

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border-primary);
  border-radius: 50%;
  border-top-color: var(--color-environment-medium);
  animation: spin 1s ease-in-out infinite;
}

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