/* Advanced Modern CSS for eBay Fee Calculator with Animations & Interactions */
:root {
  --primary-color: #0052cc;
  --primary-light: #007fff;
  --primary-dark: #004a9f;
  --accent-color: #ffd700;
  --success-color: #28a745;
  --warning-color: #ffc107;
  --danger-color: #dc3545;
  --light-bg: #f8f9fa;
  --card-bg: #ffffff;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --border-color: #cfd8dc;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.2);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius: 12px;
}

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

body {
  font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, #e9f5ff 0%, var(--light-bg) 100%);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* Header Styles */
header {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
  color: white;
  padding: 2rem 0;
  text-align: center;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 20"><defs><radialGradient id="g"><stop offset="20%" stop-color="%23ffffff" stop-opacity="0.1"/><stop offset="50%" stop-color="%23ffffff" stop-opacity="0"/></radialGradient></defs><rect width="100" height="20" fill="url(%23g)"/></svg>');
  opacity: 0.3;
}

.header-content {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 1.5rem;
  font-weight: 300;
}

.icon-animated {
  display: inline-block;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-10px); }
  60% { transform: translateY(-5px); }
}

/* Navigation */
nav {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  font-size: 1.1rem;
  padding: 0.5rem 1rem;
  border-radius: 25px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

nav a::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.2);
  transition: var(--transition);
}

nav a:hover::before {
  left: 0;
}

nav a:hover {
  color: var(--accent-color);
  transform: translateY(-2px);
}

.nav-active {
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
}

/* SEO Intro Section */
.seo-intro {
  background: var(--card-bg);
  padding: 2rem 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.seo-intro h2 {
  color: var(--primary-color);
  margin-bottom: 1rem;
  font-size: 1.8rem;
}

/* Main Layout */
main {
  max-width: 1200px;
  margin: 2rem auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  padding: 0 1rem;
}

/* Calculator Section */
.calculator-section {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  height: fit-content;
  position: sticky;
  top: 2rem;
}

.calculator-header {
  text-align: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--light-bg);
}

.calculator-header h3 {
  color: var(--primary-color);
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

/* Form Styles */
.calculator-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.input-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.input-field {
  position: relative;
}

.input-field label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.label-icon {
  font-size: 1.1rem;
}

.required {
  color: var(--danger-color);
}

.animated-input, .animated-select {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--card-bg);
  transition: var(--transition);
  position: relative;
}

.animated-input:focus, .animated-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(0, 82, 204, 0.1);
  transform: translateY(-1px);
}

.input-highlight {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: var(--transition);
}

.animated-input:focus + .input-highlight {
  width: 100%;
}

/* Checkbox Styles */
.checkbox-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.checkbox-item {
  position: relative;
}

.animated-checkbox {
  position: absolute;
  opacity: 0;
  cursor: pointer;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 6px;
  transition: var(--transition);
}

.checkbox-label:hover {
  background: var(--light-bg);
}

.checkmark {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-radius: 4px;
  position: relative;
  transition: var(--transition);
}

.checkmark::after {
  content: '';
  position: absolute;
  left: 6px;
  top: 2px;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) scale(0);
  transition: var(--transition);
}

.animated-checkbox:checked + .checkbox-label .checkmark {
  background: var(--primary-color);
  border-color: var(--primary-color);
}

.animated-checkbox:checked + .checkbox-label .checkmark::after {
  transform: rotate(45deg) scale(1);
}

/* Button Styles */
.calculate-btn {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
  color: white;
  border: none;
  padding: 1rem 2rem;
  border-radius: 50px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.calculate-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: scale(0);
  animation: ripple 0.6s linear;
}

@keyframes ripple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* Results Section */
.results-section {
  display: flex;
  flex-direction: column;
}

.results-card {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(0, 82, 204, 0.1);
  animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--light-bg);
}

.results-header h3 {
  color: var(--primary-color);
  font-size: 1.4rem;
}

.results-badge {
  background: var(--success-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 15px;
  font-size: 0.8rem;
  font-weight: 600;
}

.fee-breakdown {
  margin-bottom: 1.5rem;
}

.profit-summary {
  padding: 1rem;
  background: linear-gradient(135deg, #e8f5e8 0%, #f0fff0 100%);
  border-radius: 8px;
  border-left: 4px solid var(--success-color);
}

.results-footer {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-secondary);
}

/* Results Placeholder */
.results-placeholder {
  background: var(--card-bg);
  padding: 3rem 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  text-align: center;
  border: 2px dashed var(--border-color);
}

.placeholder-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.7;
}

.placeholder-features {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.feature {
  color: var(--success-color);
  font-weight: 500;
}

/* Features Section */
.features-section {
  background: var(--card-bg);
  padding: 4rem 0;
  margin-top: 3rem;
}

.features-section h2 {
  text-align: center;
  color: var(--primary-color);
  margin-bottom: 3rem;
  font-size: 2rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.feature-card {
  text-align: center;
  padding: 2rem;
  border-radius: var(--border-radius);
  background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  color: var(--primary-color);
  margin-bottom: 1rem;
}

/* SEO Content Section */
.seo-content {
  background: var(--light-bg);
  padding: 4rem 0;
}

.seo-content h2 {
  text-align: center;
  color: var(--primary-color);
  margin-bottom: 3rem;
  font-size: 2rem;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.content-block {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
}

.content-block h3 {
  color: var(--primary-color);
  margin-bottom: 1rem;
}

/* Disclaimer Section */
.disclaimer-section {
  background: linear-gradient(135deg, #fff3cd 0%, #fef7e6 100%);
  padding: 1.5rem;
  border-radius: 12px;
  border-left: 4px solid var(--warning-color);
  margin-top: 2rem;
  text-align: center;
}

.disclaimer-section p {
  margin: 0;
  font-size: 1.1rem;
}

.disclaimer-section a:hover {
  text-decoration: underline !important;
}

/* Contact Page Specific Styles */
.contact-main {
  display: block !important;
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
}

.contact-form-section {
  min-width: 0;
}

.contact-help-section {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.section-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--light-bg);
}

.section-header h2 {
  color: var(--primary-color);
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-btn {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
  color: white;
  border: none;
  padding: 1rem 2rem;
  border-radius: 50px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
}

.contact-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.help-card {
  background: var(--light-bg);
  padding: 1.5rem;
  border-radius: 12px;
  border-left: 4px solid var(--primary-color);
}

.help-card h2, .help-card h3 {
  color: var(--primary-color);
  margin-top: 0;
  margin-bottom: 1rem;
}

.help-card ul {
  padding-left: 1.2rem;
  margin: 0.5rem 0;
}

.help-card li {
  margin-bottom: 0.5rem;
}

.help-card a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

.help-card a:hover {
  text-decoration: underline;
}

.feature-card {
  background: linear-gradient(135deg, #e9f5ff 0%, #f0f8ff 100%);
  border-left-color: var(--success-color);
}

.bug-card {
  background: linear-gradient(135deg, #fff3e0 0%, #fef7f0 100%);
  border-left-color: var(--warning-color);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  text-align: center;
}

/* Animation for success message */
@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive design for contact page */
@media (max-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 1.5rem;
  }
  
  .contact-main {
    margin: 1rem auto;
  }
}

/* Footer */
footer {
  background: var(--primary-color);
  color: white;
  text-align: center;
  padding: 2rem 0;
  margin-top: 3rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  main {
    grid-template-columns: 1fr;
    gap: 1rem;
    margin: 1rem auto;
  }
  
  .calculator-section {
    position: static;
  }
  
  .input-group, .checkbox-group {
    grid-template-columns: 1fr;
  }
  
  header h1 {
    font-size: 2rem;
  }
  
  .features-grid, .content-grid {
    grid-template-columns: 1fr;
  }
  
  nav {
    gap: 1rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 0.5rem;
  }
  
  .calculator-section, .results-card, .results-placeholder {
    padding: 1.5rem;
  }
  
  header h1 {
    font-size: 1.5rem;
  }
  
  .subtitle {
    font-size: 1rem;
  }
}