/* PetScans Website - Design System Stylesheet */
/* Based on ColorTokens.swift and TypographyTokens.swift */

/* Import Quicksand font */
@import url('https://fonts.googleapis.com/css2?family=Quicksand:wght@300;400;500;600;700&display=swap');

/* CSS Custom Properties - Design Tokens */
:root {
  /* Brand Colors */
  --color-brand-primary: #34C759;
  --color-brand-secondary: #52C41A;

  /* Score Colors (Traffic Light System) */
  --color-score-excellent: #2DA44E;
  --color-score-good: #52C41A;
  --color-score-moderate: #FF9500;
  --color-score-poor: #FF3B30;

  /* Semantic Colors */
  --color-success: #52C41A;
  --color-error: #FF3B30;
  --color-warning: #FF9500;
  --color-info: #007AFF;

  /* Light Mode Background & Surface */
  --color-background: #F0F9F4;
  --color-surface: #FFFFFF;
  --color-surface-secondary: #F5F5F5;
  --color-border: #E0E0E0;

  /* Light Mode Text */
  --color-text-primary: #1A1A1A;
  --color-text-secondary: #666666;
  --color-text-tertiary: #999999;
  --color-text-inverse: #FFFFFF;

  /* Spacing (4pt grid system) */
  --space-xxxs: 4px;
  --space-xxs: 8px;
  --space-xs: 12px;
  --space-sm: 16px;
  --space-md: 20px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 40px;
  --space-xxxl: 48px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-pill: 999px;

  /* Typography */
  --font-family: 'Quicksand', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-caption: 12px;
  --font-size-body-small: 13px;
  --font-size-body: 15px;
  --font-size-body-large: 17px;
  --font-size-heading-3: 15px;
  --font-size-heading-2: 17px;
  --font-size-heading-1: 20px;
  --font-size-display-small: 22px;
  --font-size-display-medium: 28px;
  --font-size-display-large: 34px;

  /* 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);

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

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #1A1F1C;
    --color-surface: #252A27;
    --color-surface-secondary: #2F3532;
    --color-border: #3A3F3C;

    --color-text-primary: #FFFFFF;
    --color-text-secondary: #A0A0A0;
    --color-text-tertiary: #707070;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
  }
}

/* Manual dark mode toggle */
[data-theme="dark"] {
  --color-background: #1A1F1C;
  --color-surface: #252A27;
  --color-surface-secondary: #2F3532;
  --color-border: #3A3F3C;

  --color-text-primary: #FFFFFF;
  --color-text-secondary: #A0A0A0;
  --color-text-tertiary: #707070;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
}

[data-theme="light"] {
  --color-background: #F0F9F4;
  --color-surface: #FFFFFF;
  --color-surface-secondary: #F5F5F5;
  --color-border: #E0E0E0;

  --color-text-primary: #1A1A1A;
  --color-text-secondary: #666666;
  --color-text-tertiary: #999999;

  --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);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-display-large);
}

h2 {
  font-size: var(--font-size-display-medium);
}

h3 {
  font-size: var(--font-size-display-small);
}

h4 {
  font-size: var(--font-size-heading-1);
}

p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

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

a:hover {
  color: var(--color-brand-secondary);
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-sm);
}

/* Header / Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  padding: var(--space-sm) 0;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-heading-1);
  font-weight: 700;
  color: var(--color-text-primary);
}

.logo img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--color-brand-primary);
}

.theme-toggle {
  background: var(--color-surface-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: var(--space-xxs) var(--space-xs);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-xxs);
  font-family: var(--font-family);
  font-size: var(--font-size-body-small);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  border-color: var(--color-brand-primary);
}

/* Mobile menu */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--space-xxs);
  cursor: pointer;
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  margin: 5px 0;
  transition: all var(--transition-fast);
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    padding: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
    gap: var(--space-sm);
  }

  .nav-links.active {
    display: flex;
  }

  .theme-toggle {
    display: none;
  }
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  text-align: center;
}

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

.hero-logo {
  width: 120px;
  height: 120px;
  margin: 0 auto var(--space-lg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.hero h1 {
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--color-brand-primary), var(--color-brand-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .tagline {
  font-size: var(--font-size-body-large);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xxs);
  padding: var(--space-xs) var(--space-lg);
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-brand-primary);
  color: var(--color-text-inverse);
}

.btn-primary:hover {
  background: var(--color-brand-secondary);
  color: var(--color-text-inverse);
}

.btn-outlined {
  background: transparent;
  border-color: var(--color-brand-primary);
  color: var(--color-brand-primary);
}

.btn-outlined:hover {
  background: var(--color-brand-primary);
  color: var(--color-text-inverse);
}

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

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

.btn-group {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* App Store Badge */
.app-store-badge {
  height: 50px;
  transition: transform var(--transition-fast);
}

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

/* Sections */
section {
  padding: var(--space-xxxl) 0;
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-xxl);
}

.section-header h2 {
  margin-bottom: var(--space-sm);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

/* Cards */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.card-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-brand-primary), var(--color-brand-secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-sm);
  color: white;
  font-size: 24px;
}

.card h3 {
  font-size: var(--font-size-heading-1);
  margin-bottom: var(--space-xxs);
}

.card p {
  margin-bottom: 0;
}

/* Score Demo */
.score-demo {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
  margin-top: var(--space-xl);
}

.score-circle {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-display-small);
  color: white;
  position: relative;
}

.score-circle.excellent {
  background: var(--color-score-excellent);
}

.score-circle.good {
  background: var(--color-score-good);
}

.score-circle.moderate {
  background: var(--color-score-moderate);
}

.score-circle.poor {
  background: var(--color-score-poor);
}

.score-label {
  font-size: var(--font-size-caption);
  font-weight: 500;
  margin-top: var(--space-xxs);
  color: var(--color-text-secondary);
  text-align: center;
}

/* How It Works */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
  counter-reset: step;
}

.step {
  text-align: center;
  padding: var(--space-lg);
}

.step::before {
  counter-increment: step;
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-brand-primary);
  color: white;
  border-radius: 50%;
  font-size: var(--font-size-heading-1);
  font-weight: 700;
  margin: 0 auto var(--space-sm);
}

.step h4 {
  margin-bottom: var(--space-xxs);
}

/* Footer */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-xxl) 0 var(--space-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer-section h4 {
  font-size: var(--font-size-body);
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--space-xxs);
}

.footer-section a {
  color: var(--color-text-secondary);
  font-size: var(--font-size-body-small);
}

.footer-section a:hover {
  color: var(--color-brand-primary);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-tertiary);
  font-size: var(--font-size-body-small);
}

/* Support Page Styles */
.page-header {
  padding-top: 120px;
  padding-bottom: var(--space-xl);
  text-align: center;
}

.contact-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  max-width: 500px;
  margin: 0 auto var(--space-xxl);
  box-shadow: var(--shadow-md);
}

.contact-card h3 {
  margin-bottom: var(--space-sm);
}

.contact-email {
  font-size: var(--font-size-heading-1);
  color: var(--color-brand-primary);
  font-weight: 600;
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  padding: var(--space-sm) var(--space-lg);
  background: none;
  border: none;
  text-align: left;
  font-family: var(--font-family);
  font-size: var(--font-size-body-large);
  font-weight: 600;
  color: var(--color-text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition-fast);
}

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

.faq-question::after {
  content: '+';
  font-size: var(--font-size-heading-1);
  color: var(--color-brand-primary);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer-content {
  padding: 0 var(--space-lg) var(--space-lg);
  color: var(--color-text-secondary);
}

/* Emergency Box */
.emergency-box {
  background: linear-gradient(135deg, rgba(255, 59, 48, 0.1), rgba(255, 149, 0, 0.1));
  border: 1px solid var(--color-warning);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  max-width: 600px;
  margin: var(--space-xxl) auto;
}

.emergency-box h3 {
  color: var(--color-error);
  margin-bottom: var(--space-sm);
}

.emergency-phone {
  font-size: var(--font-size-display-small);
  font-weight: 700;
  color: var(--color-error);
}

/* Disclaimer */
.disclaimer {
  background: var(--color-surface-secondary);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-top: var(--space-xxl);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.disclaimer h4 {
  margin-bottom: var(--space-sm);
  color: var(--color-text-secondary);
}

.disclaimer p {
  font-size: var(--font-size-body-small);
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-xxs);
}

/* Legal Pages */
.legal-content {
  max-width: 800px;
  margin: 0 auto;
  padding-top: 100px;
}

.legal-content h1 {
  margin-bottom: var(--space-xxs);
}

.legal-content .last-updated {
  color: var(--color-text-tertiary);
  font-size: var(--font-size-body-small);
  margin-bottom: var(--space-xl);
}

.legal-content h2 {
  font-size: var(--font-size-heading-1);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.legal-content p, .legal-content ul {
  margin-bottom: var(--space-sm);
}

.legal-content ul {
  padding-left: var(--space-lg);
}

.legal-content li {
  margin-bottom: var(--space-xxs);
  color: var(--color-text-secondary);
}

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

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

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

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

.animate-fade-in {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-delay-1 {
  animation-delay: 0.1s;
}

.animate-delay-2 {
  animation-delay: 0.2s;
}

.animate-delay-3 {
  animation-delay: 0.3s;
}