:root {
  /* Main Colors */
  --primary-color: #4361ee;
  --primary-light: #4895ef;
  --primary-dark: #3a0ca3;
  --secondary-color: #f72585;
  --secondary-light: #ff6b6b;
  /* Neutral Colors */
  --text-color: #2b2d42;
  --text-light: #6c757d;
  --text-lighter: #adb5bd;
  /* Background Colors */
  --bg-color: #ffffff;
  --bg-light: #f8f9fa;
  --bg-lighter: #e9ecef;
  --bg-dark: #121826;
  --bg-darker: #0a0e17;
  /* Header & Footer */
  --header-footer-bg: #121826;
  --header-footer-text: #f8f9fa;
  --header-height: 70px;
  /* UI Elements */
  --border-color: #dee2e6;
  --border-radius-sm: 4px;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.06);
  --container-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  /* Transitions */
  --transition-fast: all 0.2s ease;
  --transition: all 0.3s ease;
  --transition-slow: all 0.5s ease;
  /* Layout */
  --container-width: 1200px;
  --section-spacing: 5rem;
  --element-spacing: 2rem;
  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
--font-secondary: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  /* Z-index layers */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
}
/* ===== RESET & BASE STYLES ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body {
  font-family: var(--font-primary);
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
p,ul,li,ol{
   color:black
}
main {
  flex: 1;
  background-color: var(--bg-color);
}
img, svg, video, canvas, audio, iframe, embed, object {
  display: block;
  max-width: 100%;
  height: auto;
}
input, button, textarea, select {
  font: inherit;
  color: inherit;
}
a {
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition);
}
a:hover {
  color: var(--primary-dark);
}
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-secondary);
  line-height: 1.3;
  color: var(--text-color);
  font-weight: 700;
  margin-bottom: 1rem;
}
h1 {
  font-size: var(--font-size-4xl);
  margin-top: 1.5rem;
  position: relative;
  padding-bottom: 1rem;
}
h1::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 80px;
  height: 4px;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}
h2 {
  font-size: var(--font-size-3xl);
  margin-top: 2rem;
  position: relative;
  padding-bottom: 0.75rem;
}
h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}
h3 {
  font-size: var(--font-size-2xl);
  margin-top: 1.5rem;
}
p, ul, ol {
  margin-bottom: 1.5rem;
}
ul, ol {
  padding-left: 1.5rem;
}
li {
  margin-bottom: 0.5rem;
}
code, pre {
  font-family: 'Courier New', Courier, monospace;
  background-color: var(--bg-light);
  border-radius: var(--border-radius);
}
code {
  padding: 0.2rem 0.4rem;
  font-size: 0.9rem;
}
pre {
  padding: 1rem;
  margin-bottom: 1.5rem;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}
pre code {
  padding: 0;
  background-color: transparent;
}
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  background-color: var(--bg-color);
  box-shadow: var(--container-shadow);
  border-radius: var(--border-radius);
}
.responsive-image {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin: 2rem auto;
    transition: var(--transition);
    height: 350px;
    width: 700px;
    object-fit: cover;
}
.responsive-image:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}
/* ===== HEADER STYLES ===== */
.site-header {
  position: sticky;
  top: 0;
  background-color: var(--header-footer-bg);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  z-index: var(--z-sticky);
  height: var(--header-height);
  display: flex;
  align-items: center;
  transition: var(--transition);
}
.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: transparent;
  box-shadow: none;
}
.logo {
  display: flex;
  align-items: center;
}
.logo a {
  font-family: var(--font-secondary);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--header-footer-text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  position: relative;
  overflow: hidden;
}
.logo a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  transform: translateX(-100%);
  transition: var(--transition);
}
.logo a:hover::before {
  transform: translateX(0);
}
.logo a img, .logo a svg {
  height: 30px;
  width: auto;
}
.main-nav {
  display: flex;
  align-items: center;
}
.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 0.5rem;
}
.nav-menu li {
  position: relative;
  margin: 0;
}
.nav-menu li a {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--header-footer-text);
  font-weight: 500;
  position: relative;
  overflow: hidden;
}
.nav-menu li a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  transform: translateX(-100%);
  transition: var(--transition);
}
.nav-menu li a:hover {
  color: var(--primary-light);
}
.nav-menu li a:hover::before {
  transform: translateX(0);
}
.has-dropdown {
  position: relative;
}
.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--header-footer-bg);
  box-shadow: var(--shadow-lg);
  border-radius: var(--border-radius);
  min-width: 220px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: var(--z-dropdown);
  list-style: none;
  padding: 0.75rem 0;
  border-top: 3px solid var(--primary-color);
}
.has-dropdown:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.dropdown li {
  margin: 0;
}
.dropdown li a {
  padding: 0.75rem 1.5rem;
  display: block;
  color: var(--header-footer-text);
  font-weight: 400;
  transition: var(--transition);
}
.dropdown li a:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--primary-light);
  padding-left: 1.75rem;
}
.dropdown li a::before {
  display: none;
}
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 30px;
  height: 24px;
  position: relative;
  z-index: var(--z-fixed);
}
.menu-toggle span {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--header-footer-text);
  margin: 5px 0;
  transition: var(--transition);
  border-radius: 3px;
}
.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}
/* ===== MAIN CONTENT STYLES ===== */
main {
  padding: 1rem 0;
  margin:10px;
}
article {
  margin-bottom: 3rem;
  background-color: var(--bg-color);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--container-shadow);
  padding: 2rem;
}
section {
  margin-bottom: 1px;
 
  transform: translateY(20px);
  transition: var(--transition-slow);
  position: relative;
}
section.fade-in {
  opacity: 1;
  transform: translateY(0);
}
/* ===== CALCULATOR STYLES ===== */
.calculator-wrapper {
  background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-lighter) 100%);
  border-radius: var(--border-radius-lg);
  padding: 2.5rem;
  margin: 3rem 0;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}
.calculator-wrapper::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
}
.calculator-wrapper h2 {
  text-align: center;
  margin-bottom: 2rem;
}
.calculator-wrapper h2::after {
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
}
.calculator {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 600px;
  margin: 0 auto;
}
.calculator-input {
  display: flex;
  align-items: center;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 0.75rem 1.25rem;
  transition: var(--transition);
  box-shadow: var(--shadow-inner);
}
.calculator-input:focus-within {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}
.calculator-input i {
  color: var(--primary-color);
  margin-right: 0.75rem;
  font-size: 1.25rem;
}
.calculator-input-field {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-size: var(--font-size-base);
  padding: 0.5rem 0;
}
.calculator-button {
  background: linear-gradient(to right, var(--primary-color), var(--primary-light));
  color: white;
  border: none;
  border-radius: var(--border-radius);
  padding: 0.875rem 1.5rem;
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.calculator-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: var(--transition);
}
.calculator-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.calculator-button:hover::before {
  left: 100%;
}
.calculator-button:active {
  transform: translateY(0);
}
.calculator-button i {
  font-size: 1.25rem;
}
.calculator-result {
  display: flex;
  align-items: center;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 0.75rem 1.25rem;
  box-shadow: var(--shadow-inner);
}
.calculator-result i {
  color: var(--secondary-color);
  margin-right: 0.75rem;
  font-size: 1.25rem;
}
.calculator-result-field {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-size: var(--font-size-base);
  padding: 0.5rem 0;
  font-weight: 600;
  color: var(--secondary-color);
}
/* ===== ENHANCED FOOTER STYLES ===== */
.site-footer {
  background-color: var(--header-footer-bg);
  color: var(--header-footer-text);
  padding: 4rem 0 2rem;
  position: relative;
  margin-top: 3rem;
  overflow: hidden;
}
.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
}
/* Add decorative background elements */
.site-footer::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(67, 97, 238, 0.1) 0%, rgba(67, 97, 238, 0) 70%);
  border-radius: 50%;
  z-index: 0;
}
.footer-decoration {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(247, 37, 133, 0.1) 0%, rgba(247, 37, 133, 0) 70%);
  border-radius: 50%;
  z-index: 0;
}
.site-footer .container {
  background-color: transparent;
  box-shadow: none;
  position: relative;
  z-index: 1;
}
.footer-top {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2.5rem;
  margin-bottom: 3rem;
}
/* Enhanced footer logo section */
.footer-logo {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.footer-brand h3 {
  color:white;
  margin-bottom: 1.25rem;
  font-family: var(--font-secondary);
  font-size: var(--font-size-xl);
  position: relative;
  display: inline-block;
  padding-bottom: 0.75rem;
}
.footer-logo h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 3px;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}
.footer-brand p {
  max-width: 300px;
  color: white;
  margin-bottom: 1.5rem;
  font-size: var(--font-size-base);
  line-height: 1.7;
}
/* Enhanced footer contact section */
.footer-contact h4 {
  color: var(--header-footer-text);
  margin-bottom: 1.5rem;
  font-size: var(--font-size-lg);
  position: relative;
  display: inline-block;
  padding-bottom: 0.75rem;
}
.footer-contact h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}
.footer-contact p {
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--text-lighter);
  transition: var(--transition);
  padding: 0.5rem;
  border-radius: var(--border-radius-sm);
}
.footer-contact p:hover {
  background-color: rgba(255, 255, 255, 0.05);
  transform: translateX(5px);
}
.footer-contact p i {
  color: var(--primary-light);
  font-size: var(--font-size-lg);
  min-width: 20px;
  text-align: center;
}
/* Enhanced footer links section */
.footer-links h4 {
  color: var(--header-footer-text);
  margin-bottom: 1.5rem;
  font-size: var(--font-size-lg);
  position: relative;
  display: inline-block;
  padding-bottom: 0.75rem;
  text-align: center;
  width: 100%;
}
.footer-links h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 2px;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}
.footer-links ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 0.5rem;
  max-height: 300px;
  overflow-y: auto;
  /* Styled scrollbar */
  scrollbar-width: thin;
  scrollbar-color: var(--primary-light) rgba(255, 255, 255, 0.1);
}
.footer-links ul::-webkit-scrollbar {
  width: 6px;
}
.footer-links ul::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}
.footer-links ul::-webkit-scrollbar-thumb {
  background-color: var(--primary-light);
  border-radius: 3px;
}
.footer-links li {
  margin-bottom: 0.25rem;
}
.footer-links a {
  color: var(--text-lighter);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.75rem;
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-base);
  position: relative;
  overflow: hidden;
}
.footer-links a::before {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  height: 1px;
  width: 0;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-light));
  transition: var(--transition);
}
.footer-links a i {
  color: var(--primary-light);
  font-size: var(--font-size-sm);
  transition: var(--transition);
}
.footer-links a:hover {
  color: var(--primary-light);
  background-color: rgba(255, 255, 255, 0.05);
  transform: translateX(5px);
}
.footer-links a:hover::before {
  width: 100%;
}
.footer-links a:hover i {
  transform: translateX(3px);
}
/* Enhanced footer bottom section */
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  text-align: center;
  color: var(--text-lighter);
  font-size: var(--font-size-sm);
  position: relative;
}
.footer-bottom::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 3px;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}
.footer-bottom p {
  margin-bottom: 0.75rem;
background-color:white;
}
.social-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.5rem;
}
.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.05));
  color: var(--header-footer-text);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.social-links a::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  opacity: 0;
  transition: var(--transition);
  z-index: -1;
}
.social-links a:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}
.social-links a:hover::before {
  opacity: 1;
}
.social-links a i {
  font-size: 1.125rem;
  transition: var(--transition);
}
.social-links a:hover i {
  transform: scale(1.2);
}
/* Enhanced Footer for Mobile */
@media (max-width: 768px) {
  .footer-top {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .footer-decoration {
    display: none;
  }
  .footer-logo, .footer-contact, .footer-links {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .footer-logo p {
    margin: 0 auto 1.5rem;
    text-align: center;
  }
  .footer-contact p {
    justify-content: center;
  }
  .footer-links ul {
    grid-template-columns: 1fr;
    max-height: none;
    margin: 0 auto;
    max-width: 300px;
  }
  .footer-links a {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    justify-content: space-between;
  }
  .footer-links a i {
    font-size: var(--font-size-base);
    margin-left: auto;
  }
  .footer-logo h3::after,
  .footer-contact h4::after {
    left: 50%;
    transform: translateX(-50%);
  }
  .social-links {
    margin-top: 2rem;
  }
  .social-links a {
    width: 45px;
    height: 45px;
  }
}
/* ===== FIXED MOBILE MENU STYLES ===== */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background-color: var(--header-footer-bg);
    flex-direction: column;
    padding: 80px 1.5rem 1.5rem;
    transition: var(--transition);
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    overflow-y: auto;
    z-index: var(--z-fixed);
  }
  /* CRITICAL FIX: Ensure the active class properly positions the menu */
  .nav-menu.active {
    right: 0;
    visibility: visible;
    opacity: 1;
  }
  /* Add overlay when menu is active */
  body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: var(--z-sticky);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
  }
  body.menu-open::after {
    opacity: 1;
    visibility: visible;
  }
  .nav-menu li {
    margin-bottom: 0.75rem;
    width: 100%;
    opacity: 0;
    transform: translateX(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    transition-delay: calc(var(--item-index, 0) * 0.1s);
  }
  .nav-menu.active li {
    opacity: 1;
    transform: translateX(0);
  }
  .nav-menu li a {
    padding: 0.875rem 0;
    width: 100%;
    display: flex;
    align-items: center;
    border-radius: var(--border-radius-sm);
    padding-left: 0.5rem;
  }
  .nav-menu li a:hover {
    background-color: rgba(255, 255, 255, 0.05);
  }
  .dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background-color: transparent;
    padding-left: 1rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    border-top: none;
    width: 100%;
  }
  .has-dropdown.active .dropdown {
    max-height: 500px;
    padding: 0.5rem 0 0.5rem 1rem;
    border-left: 2px solid var(--primary-color);
    margin: 0.5rem 0;
  }
  .dropdown li a {
    padding: 0.75rem 0.5rem;
  }
  .dropdown li a:hover {
    padding-left: 1rem;
    background-color: rgba(255, 255, 255, 0.05);
  }
  .has-dropdown > a {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .has-dropdown > a::after {
    content: '107'; /* Font Awesome chevron-down icon */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    transition: var(--transition);
    margin-left: 0.5rem;
  }
  .has-dropdown.active > a::after {
    transform: rotate(180deg);
  }
}
/* ===== SCROLL TO TOP BUTTON ===== */
.scroll-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-fixed);
}
.scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
}
.scroll-to-top:hover {
  transform: translateY(-5px);
}
.scroll-to-top::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: scale(0);
  transition: var(--transition);
}
.scroll-to-top:hover::before {
  transform: scale(1.2);
  opacity: 0;
}
/* ===== TABLE STYLES ===== */
.table-container {
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}
table {
  width: 100%;
  border-collapse: collapse;
  border-spacing: 0;
  background-color: var(--bg-color);
}
table thead {
  background: linear-gradient(to right, var(--primary-color), var(--primary-light));
  color: white;
}
table th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  text-transform: uppercase;
  font-size: var(--font-size-sm);
  letter-spacing: 0.5px;
}
table td {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}
table tbody tr:last-child td {
  border-bottom: none;
}
table tbody tr:hover {
  background-color: var(--bg-light);
}
table tbody tr:nth-child(even) {
  background-color: var(--bg-lighter);
}
table tbody tr:nth-child(even):hover {
  background-color: var(--bg-light);
}
/* Responsive tables */
@media (max-width: 768px) {
  .table-responsive {
    display: block;
    width: 100%;
    overflow-x: auto;
  }
  .table-responsive thead {
    display: none;
  }
  .table-responsive tbody tr {
    display: block;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
  }
  .table-responsive tbody td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: right;
    border-bottom: 1px solid var(--border-color);
  }
  .table-responsive tbody td:last-child {
    border-bottom: none;
  }
  .table-responsive tbody td::before {
    content: attr(data-label);
    font-weight: 600;
    text-align: left;
    color: var(--text-color);
  }
}
/* ===== CONTACT FORM STYLES ===== */
.contact-form {
  max-width: 700px;
  margin: 2rem auto;
  padding: 2rem;
  background-color: var(--bg-light);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
}
.contact-form h2 {
  text-align: center;
  margin-bottom: 2rem;
}
.contact-form h2::after {
  left: 50%;
  transform: translateX(-50%);
}
.form-group {
  margin-bottom: 1.5rem;
}
.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-color);
}
.form-control {
  display: block;
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--text-color);
  background-color: var(--bg-color);
  background-clip: padding-box;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  transition: var(--transition);
}
.form-control:focus {
  border-color: var(--primary-color);
  outline: 0;
  box-shadow: 0 0 0 0.2rem rgba(67, 97, 238, 0.25);
}
textarea.form-control {
  height: auto;
  min-height: 150px;
  resize: vertical;
}
.form-check {
  display: flex;
  align-items: flex-start;
  margin-bottom: 1rem;
}
.form-check-input {
  margin-right: 0.5rem;
  margin-top: 0.25rem;
}
.form-check-label {
  margin-bottom: 0;
}
.form-row {
  display: flex;
  flex-wrap: wrap;
  margin-right: -0.5rem;
  margin-left: -0.5rem;
}
.form-col {
  flex: 0 0 50%;
  max-width: 50%;
  padding: 0 0.5rem;
}
.btn {
  display: inline-block;
  font-weight: 500;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  user-select: none;
  border: 1px solid transparent;
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-base);
  line-height: 1.5;
  border-radius: var(--border-radius);
  transition: var(--transition);
  cursor: pointer;
}
.btn-primary {
  color: #fff;
  background: linear-gradient(to right, var(--primary-color), var(--primary-light));
  border-color: var(--primary-color);
  box-shadow: var(--shadow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.btn-block {
  display: block;
  width: 100%;
}
.form-message {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius);
}
.form-message.success {
  background-color: rgba(16, 185, 129, 0.1);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.2);
}
.form-message.error {
  background-color: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.2);
}
@media (max-width: 576px) {
  .form-col {
    flex: 0 0 100%;
    max-width: 100%;
  }
  .contact-form {
    padding: 1.5rem;
  }
}
/* ===== RESPONSIVE STYLES ===== */
@media (max-width: 1200px) {
  :root {
    --container-width: 960px;
    --section-spacing: 4rem;
  }
}
@media (max-width: 992px) {
  :root {
    --container-width: 720px;
    --section-spacing: 3.5rem;
  }
  h1 {
    font-size: var(--font-size-3xl);
  }
  h2 {
    font-size: var(--font-size-2xl);
  }
  h3 {
    font-size: var(--font-size-xl);
  }
  .calculator-wrapper {
    padding: 2rem;
  }
  article {
    padding: 1.5rem;
  }
  .responsive-image {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin: 2rem auto;
    transition: var(--transition);
    height: 200px;
    width: 300px;
    object-fit: cover;
}
}
@media (max-width: 576px) {
  :root {
    --container-width: 100%;
    --section-spacing: 2.5rem;
  }
  html {
    font-size: 14px;
  }
  h1 {
    font-size: var(--font-size-2xl);
  }
  h2 {
    font-size: var(--font-size-xl);
  }
  h3 {
    font-size: var(--font-size-lg);
  }
  .calculator-wrapper {
    padding: 1.5rem;
    margin: 2rem 0;
  }
  .calculator-input, .calculator-result {
    padding: 0.625rem 1rem;
  }
  .calculator-button {
    padding: 0.75rem 1.25rem;
  }
  .scroll-to-top {
    width: 40px;
    height: 40px;
    bottom: 20px;
    right: 20px;
  }
  article {
    padding: 1rem;
    margin-bottom: 2rem;
  }
}
/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}
@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}
@keyframes float {
  0% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-5px);
  }
  100% {
    transform: translateY(0px);
  }
}
.fade-in {
  animation: fadeIn 0.8s ease forwards;
}
.pulse {
  animation: pulse 2s infinite;
}
.float {
  animation: float 3s ease-in-out infinite;
}
/* ===== UTILITY CLASSES ===== */
.text-center {
  text-align: center;
}
.text-primary {
  color: var(--primary-color);
}
.text-secondary {
  color: var(--secondary-color);
}
.bg-gradient {
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }
.py-1 { padding-top: 0.25rem; padding-bottom: 0.25rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-3 { padding-top: 1rem; padding-bottom: 1rem; }
.py-4 { padding-top: 1.5rem; padding-bottom: 1.5rem; }
.py-5 { padding-top: 3rem; padding-bottom: 3rem; }
.px-1 { padding-left: 0.25rem; padding-right: 0.25rem; }
.px-2 { padding-left: 0.5rem; padding-right: 0.5rem; }
.px-3 { padding-left: 1rem; padding-right: 1rem; }
.px-4 { padding-left: 1.5rem; padding-right: 1.5rem; }
.px-5 { padding-left: 3rem; padding-right: 3rem; }
/* Accessibility focus styles */
a:focus, button:focus, input:focus, select:focus, textarea:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}
/* Skip to content link for accessibility */
.skip-to-content {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary-color);
  color: white;
  padding: 8px;
  z-index: var(--z-tooltip);
  transition: top 0.3s;
}
.skip-to-content:focus {
  top: 0;
}

/* Loading indicator */
.loading {
  position: relative;
}
.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}
/* ===== PRINT STYLES ===== */
@media print {
  .site-header, .site-footer, .scroll-to-top {
    display: none;
  }
  body {
    font-size: 12pt;
    line-height: 1.5;
    background: white;
    color: black;
  }
  a {
    text-decoration: underline;
    color: #000;
  }
  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
    page-break-inside: avoid;
    color: black;
  }
  h1::after, h2::after, h3::after, h4::after {
    display: none;
  }
  img {
    page-break-inside: avoid;
    max-width: 100% !important;
  }
  pre, blockquote {
    page-break-inside: avoid;
    border: 1px solid #ddd;
  }
  .calculator-wrapper {
    page-break-inside: avoid;
    background: white;
    border: 1px solid #ddd;
    box-shadow: none;
  }
  .calculator-wrapper::before {
    display: none;
  }
  article, section {
    box-shadow: none;
    background: white;
  }
}
