/* TennisTech Pro - Main Stylesheet */

/* CSS Custom Properties */
:root {
  --color-primary: #2D5A27;
  --color-primary-dark: #1E3D1A;
  --color-primary-light: #4A7A43;
  --color-secondary: #8B4513;
  --color-secondary-light: #A0522D;
  --color-accent: #CCFF00;
  --color-accent-dark: #B8E600;
  --color-bg-light: #F5F5F0;
  --color-bg-dark: #1A1A1A;
  --color-text-primary: #333333;
  --color-text-secondary: #666666;
  --color-text-light: #F5F5F0;
  --color-border: #E0E0E0;
  --color-white: #FFFFFF;
  --color-success: #28a745;
  --color-error: #dc3545;
  
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
  --shadow-xl: 0 20px 40px rgba(0,0,0,0.2);
  
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
  
  --max-width: 1200px;
  --header-height: 70px;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

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

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

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

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

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

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

/* Utility Classes */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-accent { color: var(--color-accent); }
.text-muted { color: var(--color-text-secondary); }

.bg-light { background-color: var(--color-bg-light); }
.bg-dark { background-color: var(--color-bg-dark); }
.bg-primary { background-color: var(--color-primary); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Header & Navigation */
.header {
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-list {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: var(--spacing-lg);
}

.nav-link {
  font-weight: 500;
  color: var(--color-text-primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: rgba(45, 90, 39, 0.05);
}

.nav-link.active {
  color: var(--color-primary);
  background-color: rgba(45, 90, 39, 0.1);
}

/* Dropdown Menu */
.dropdown {
  position: relative;
}

.dropdown-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.dropdown-toggle svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.dropdown:hover .dropdown-toggle svg {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 250px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-sm);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-normal);
  z-index: 100;
}

.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-size: 0.9rem;
  transition: background var(--transition-fast);
}

.dropdown-item:hover {
  background-color: rgba(45, 90, 39, 0.08);
  color: var(--color-primary);
}

.dropdown-item svg {
  width: 18px;
  height: 18px;
  color: var(--color-primary);
}

/* Mobile Menu */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  padding: var(--spacing-sm);
  cursor: pointer;
  color: var(--color-text-primary);
}

.mobile-menu-btn svg {
  width: 28px;
  height: 28px;
}

.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-white);
  padding: var(--spacing-lg);
  z-index: 999;
  overflow-y: auto;
}

.mobile-nav.active {
  display: block;
}

.mobile-nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mobile-nav-list > li {
  margin-bottom: 0;
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav-link {
  display: block;
  padding: var(--spacing-md) 0;
  font-weight: 500;
  color: var(--color-text-primary);
}

.mobile-submenu {
  list-style: none;
  padding: 0 0 var(--spacing-md) var(--spacing-lg);
}

.mobile-submenu a {
  display: block;
  padding: var(--spacing-sm) 0;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

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

.hero p {
  font-size: 1.25rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-primary-dark);
}

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

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

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

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

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

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.875rem;
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.125rem;
}

/* Cards */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
}

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

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

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.card-meta {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.card-body {
  color: var(--color-text-secondary);
}

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

/* Grid Layouts */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Tool Cards */
.tool-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.tool-card .card-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.tool-card .card-icon svg {
  width: 24px;
  height: 24px;
}

.tool-card .card-title a {
  color: var(--color-text-primary);
}

.tool-card .card-title a:hover {
  color: var(--color-primary);
}

/* Article Cards */
.article-card {
  display: flex;
  flex-direction: column;
}

.article-card .card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
}

.article-card .read-more {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-weight: 600;
  color: var(--color-primary);
}

.article-card .read-more svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.article-card .read-more:hover svg {
  transform: translateX(4px);
}

/* Section Styles */
.section {
  padding: var(--spacing-3xl) 0;
}

.section-dark {
  background-color: var(--color-bg-dark);
  color: var(--color-text-light);
}

.section-dark h2,
.section-dark h3 {
  color: var(--color-text-light);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--spacing-2xl);
}

.section-header h2 {
  margin-bottom: var(--spacing-md);
}

.section-header p {
  color: var(--color-text-secondary);
}

.section-dark .section-header p {
  color: rgba(255,255,255,0.7);
}

/* Feature Box */
.feature-box {
  display: flex;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.feature-box-icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
}

.feature-box-icon svg {
  width: 28px;
  height: 28px;
}

.feature-box-content h3 {
  margin-bottom: var(--spacing-sm);
}

/* Calculator/Form Styles */
.calculator {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-xl);
}

.calculator-header {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 2px solid var(--color-border);
}

.calculator-title {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-sm);
}

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

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

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

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-body);
  font-size: 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast);
  background: var(--color-white);
}

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

.form-input::placeholder {
  color: var(--color-text-secondary);
}

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

.form-hint {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.form-slider {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.form-slider input[type="range"] {
  flex: 1;
}

.form-slider-value {
  min-width: 60px;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-bg-light);
  border-radius: var(--radius-sm);
  text-align: center;
  font-weight: 600;
}

/* Results Display */
.result-box {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  margin-top: var(--spacing-xl);
}

.result-value {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.result-label {
  font-size: 1rem;
  opacity: 0.9;
}

.result-details {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255,255,255,0.2);
  text-align: left;
}

.result-detail-item {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
  font-size: 0.9rem;
}

.result-detail-item span:first-child {
  opacity: 0.8;
}

/* Info Box */
.info-box {
  background: rgba(45, 90, 39, 0.08);
  border-left: 4px solid var(--color-primary);
  padding: var(--spacing-lg);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: var(--spacing-lg) 0;
}

.info-box h4 {
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}

.info-box p:last-child {
  margin-bottom: 0;
}

/* Warning Box */
.warning-box {
  background: rgba(139, 69, 19, 0.08);
  border-left: 4px solid var(--color-secondary);
  padding: var(--spacing-lg);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: var(--spacing-lg) 0;
}

.warning-box h4 {
  margin-bottom: var(--spacing-sm);
  color: var(--color-secondary);
}

.warning-box p:last-child {
  margin-bottom: 0;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg) 0;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.breadcrumb a {
  color: var(--color-primary);
}

.breadcrumb svg {
  width: 16px;
  height: 16px;
}

/* Page Header */
.page-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  padding: var(--spacing-2xl) 0;
}

.page-header h1 {
  color: var(--color-white);
  margin-bottom: var(--spacing-sm);
}

.page-header p {
  opacity: 0.9;
  margin: 0;
}

/* Footer */
.footer {
  background: var(--color-bg-dark);
  color: var(--color-text-light);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .logo {
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.footer-brand p {
  color: rgba(255,255,255,0.7);
  font-size: 0.9rem;
}

.footer h4 {
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

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

.footer-links a {
  color: rgba(255,255,255,0.7);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.5);
}

.footer-legal {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-legal a {
  color: rgba(255,255,255,0.5);
}

.footer-legal a:hover {
  color: var(--color-white);
}

/* Related Links */
.related-tools {
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-xl);
  border-top: 2px solid var(--color-border);
}

.related-tools h3 {
  margin-bottom: var(--spacing-lg);
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  list-style: none;
  padding: 0;
  margin: 0;
}

.related-links li a {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-light);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.related-links li a:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.related-links li a svg {
  width: 16px;
  height: 16px;
}

/* Article Content Styles */
.article-content {
  max-width: 800px;
  margin: 0 auto;
}

.article-content h2 {
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.article-content h3 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.article-content p {
  margin-bottom: var(--spacing-lg);
}

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

.article-content li {
  margin-bottom: var(--spacing-sm);
}

.article-featured-image {
  width: 100%;
  max-height: 500px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-xl);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.article-meta svg {
  width: 18px;
  height: 18px;
}

.article-author {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xl);
}

.article-tag {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-bg-light);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* Contact Form */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
}

.contact-info {
  padding: var(--spacing-xl);
}

.contact-info h3 {
  margin-bottom: var(--spacing-lg);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.contact-item svg {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-item h4 {
  margin-bottom: var(--spacing-xs);
  font-size: 1rem;
}

.contact-item p {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

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

.legal-content h2 {
  font-size: 1.5rem;
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
}

.legal-content h3 {
  font-size: 1.25rem;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

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

/* Statistics/Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
}

.stat-item {
  text-align: center;
  padding: var(--spacing-xl);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

/* Table Styles */
.table-wrapper {
  overflow-x: auto;
  margin: var(--spacing-lg) 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

thead {
  background: var(--color-primary);
  color: var(--color-white);
}

th {
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: left;
  font-weight: 600;
}

td {
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

tbody tr:hover {
  background: rgba(45, 90, 39, 0.05);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
  
  .nav { display: none; }
  .mobile-menu-btn { display: block; }
  
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  
  .grid-2,
  .grid-3,
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  
  .footer-grid { grid-template-columns: 1fr; gap: var(--spacing-xl); }
  .footer-bottom { flex-direction: column; gap: var(--spacing-md); text-align: center; }
  
  .form-row { grid-template-columns: 1fr; }
  
  .contact-grid { grid-template-columns: 1fr; }
  
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  
  .result-value { font-size: 2rem; }
}

@media (max-width: 480px) {
  :root { --header-height: 60px; }
  
  .container { padding: 0 var(--spacing-md); }
  
  .grid-2,
  .grid-3,
  .grid-4 { grid-template-columns: 1fr; }
  
  .section { padding: var(--spacing-2xl) 0; }
  
  .hero-buttons { flex-direction: column; }
  .hero-buttons .btn { width: 100%; }
  
  .calculator { padding: var(--spacing-lg); }
  
  .page-header { padding: var(--spacing-xl) 0; }
}

/* Animation Classes */
.fade-in {
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Print Styles */
@media print {
  .header,
  .footer,
  .mobile-nav,
  .breadcrumb { display: none; }
  
  .article-content { max-width: 100%; }
  
  body { font-size: 12pt; }
}