/* ===================================
   Love It To Bits - Visual Currency Calculator
   Bright, Clean, Accessible Design
   =================================== */

/* CSS Custom Properties for Theme */
:root {
  /* Colors - WCAG 2.2 AA Compliant */
  --color-primary-bg: #FFFFFF;
  --color-secondary-bg: #F0F7FB;
  --color-accent-bg: #E3F2FD;
  --color-text-primary: #1a1a1a;
  --color-text-secondary: #424242;
  --color-accent: #0277BD;
  --color-accent-hover: #01579B;
  --color-link: #0066CC;
  --color-link-hover: #004499;
  --color-border: #D0D0D0;
  --color-focus: #005FCC;
  --color-success: #2E7D32;
  --color-error: #C62828;

  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-family-heading: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;

  --font-size-base: 16px;
  --line-height-base: 1.6;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;

  /* Layout */
  --max-width-content: 1200px;
  --max-width-text: 800px;
  --border-radius: 8px;

  /* Transitions */
  --transition-fast: 0.2s ease;
}

/* ===================================
   Base Styles & Reset
   =================================== */

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  line-height: var(--line-height-base);
  color: var(--color-text-primary);
  background-color: var(--color-primary-bg);
}

/* ===================================
   Skip Link (Accessibility)
   =================================== */

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-accent);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  text-decoration: none;
  font-weight: 600;
  z-index: 100;
  border-radius: 0 0 var(--border-radius) 0;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

/* ===================================
   Focus Indicators (WCAG 2.2 AA)
   =================================== */

a:focus,
button:focus,
input:focus,
textarea:focus,
select:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ===================================
   Typography
   =================================== */

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

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

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

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

h4 {
  font-size: 1.25rem;
}

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

a {
  color: var(--color-link);
  text-decoration: underline;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-link-hover);
}

/* ===================================
   Layout Components
   =================================== */

.container {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-text {
  max-width: var(--max-width-text);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ===================================
   Header & Navigation
   =================================== */

.site-header {
  background-color: var(--color-primary-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.site-branding {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
  color: var(--color-accent);
}

.site-tagline {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-style: italic;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.site-nav a {
  text-decoration: none;
  color: var(--color-text-primary);
  font-weight: 500;
  padding: var(--spacing-xs) 0;
  transition: color var(--transition-fast);
}

.site-nav a:hover {
  color: var(--color-accent);
}

/* ===================================
   Hero Section
   =================================== */

.hero {
  background: linear-gradient(135deg, var(--color-secondary-bg) 0%, var(--color-accent-bg) 100%);
  padding: var(--spacing-xxl) 0;
  text-align: center;
}

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

.hero .subheading {
  font-size: 1.5rem;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  font-weight: 500;
}

.hero p {
  font-size: 1.125rem;
  max-width: 700px;
  margin: 0 auto var(--spacing-lg);
}

.hero-image {
  margin: var(--spacing-xl) auto;
  max-width: var(--max-width-content);
  width: 90%;
}

.hero-image img {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius);
}

/* ===================================
   Sections
   =================================== */

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

.section:nth-child(even) {
  background-color: var(--color-secondary-bg);
}

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

.section-subheading {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  font-weight: 400;
  margin-top: var(--spacing-sm);
}

/* ===================================
   Buttons & CTAs
   =================================== */

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-accent);
  color: white;
  text-decoration: none;
  border-radius: var(--border-radius);
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast);
  font-size: 1rem;
  line-height: 1.5;
  text-align: center;
  min-height: 44px;
  min-width: 44px;
}

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

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

.app-store-badge {
  display: inline-block;
  margin: var(--spacing-sm);
  transition: transform var(--transition-fast);
}

.app-store-badge:hover {
  transform: translateY(-2px);
}

.app-store-badge img {
  height: 54px;
  width: auto;
}

.cta-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
}

/* ===================================
   Screenshots & Images
   =================================== */

.screenshots {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  align-items: flex-end;
  flex-wrap: wrap;
  margin-top: var(--spacing-xl);
}

.screenshot {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius);
}

/* Counter Mode: iPad (screenshot-1) and iPhone (screenshot-2) */
.screenshots img[src*="screenshot-1"] {
  max-width: 450px;
}

.screenshots img[src*="screenshot-2"] {
  max-width: 300px;
}

/* Calculator Mode: maintain original size */
.screenshots img[src*="screenshot-3"] {
  max-width: 300px;
}

/* ===================================
   Forms
   =================================== */

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

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

.required {
  color: var(--color-error);
  margin-left: 0.25rem;
}

input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  font-family: var(--font-family-base);
  font-size: 1rem;
  line-height: 1.5;
  transition: border-color var(--transition-fast);
  background-color: var(--color-primary-bg);
  color: var(--color-text-primary);
  min-height: 44px;
}

input[type="text"]:focus,
input[type="email"]:focus,
textarea:focus {
  border-color: var(--color-accent);
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

textarea {
  resize: vertical;
  min-height: 150px;
}

.form-message {
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-lg);
  font-weight: 500;
}

.form-message.success {
  background-color: #E8F5E9;
  color: var(--color-success);
  border: 1px solid var(--color-success);
}

.form-message.error {
  background-color: #FFEBEE;
  color: var(--color-error);
  border: 1px solid var(--color-error);
}

/* Honeypot field - hide from view */
.hidden {
  display: none;
}

/* ===================================
   Footer
   =================================== */

.site-footer {
  background-color: var(--color-text-primary);
  color: white;
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-xxl);
}

.footer-content {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.footer-links {
  list-style: none;
  margin-bottom: var(--spacing-lg);
}

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

.footer-links a {
  color: #B3E5FC;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: white;
  text-decoration: underline;
}

.footer-copyright {
  color: white;
  font-size: 0.875rem;
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-copyright p {
  color: white !important;
  margin-bottom: 0;
}

/* ===================================
   Content Formatting (Legal Pages)
   =================================== */

.content-page {
  padding: var(--spacing-xxl) 0;
}

.content-page h1 {
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.content-page h2 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-accent);
}

.content-page h3 {
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

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

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

.content-page li {
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-secondary);
}

/* ===================================
   Responsive Design - Tablet
   =================================== */

@media (max-width: 768px) {
  :root {
    --font-size-base: 15px;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .hero .subheading {
    font-size: 1.25rem;
  }

  .site-header .container {
    flex-direction: column;
    text-align: center;
  }

  .site-nav ul {
    justify-content: center;
    gap: var(--spacing-md);
  }

  .screenshots {
    flex-direction: column;
  }

  .screenshot {
    max-width: 400px;
  }
}

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

@media (max-width: 480px) {
  :root {
    --spacing-xl: 2rem;
    --spacing-xxl: 2.5rem;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .hero h1 {
    font-size: 1.875rem;
  }

  .hero .subheading {
    font-size: 1.125rem;
  }

  .site-nav ul {
    gap: var(--spacing-sm);
    flex-direction: column;
    width: 100%;
  }

  .site-nav li {
    width: 100%;
  }

  .site-nav a {
    display: block;
    padding: var(--spacing-xs);
    text-align: center;
  }
}

/* ===================================
   Print Styles
   =================================== */

@media print {
  .site-header,
  .site-footer,
  .cta-buttons,
  .app-store-badge,
  .skip-link {
    display: none;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
    color: #000;
  }

  a {
    text-decoration: underline;
    color: #000;
  }

  a[href^="http"]:after {
    content: " (" attr(href) ")";
  }
}

/* ===================================
   Utility Classes
   =================================== */

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

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

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

.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;
}