:root {
  --black: #000000;
  --white: #ffffff;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
  font-family: 'Space Grotesk', sans-serif;
  background-color: var(--black);
  color: var(--white);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a{
  text-decoration: none;
  color: var(--gray-200);
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1rem;
  width: 100%;
}

header {
  margin-bottom: 3rem;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.logo-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--white);
  border-radius: 12px;
  padding: 10px;
}

.logo-icon svg {
  width: 100%;
  height: 100%;
  color: var(--white);
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.calculator-container {
  margin-bottom: 3rem;
}

.tabs {
  display: flex;
  justify-content: center;
  margin-bottom: 2rem;
  gap: 1rem;
}

.tab-btn {
  padding: 1rem 3rem;
  border: 2px solid var(--white);
  background: transparent;
  cursor: pointer;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--white);
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.tab-btn:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.tab-btn.active {
  background-color: var(--white);
  color: var(--black);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.calculator-card {
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 2rem;
  backdrop-filter: blur(10px);
}

.calculator-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

h2 {
  font-size: 1.5rem;
  font-weight: 600;
}

.scale-selector {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.scale-selector label {
  font-weight: 500;
}

select {
  padding: 0.5rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--gray-300);
  background-color: var(--white);
  color: var(--black);
  font-family: inherit;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
}

select:focus {
  outline: none;
  border-color: var(--black);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.2);
}

.courses-container,
.semesters-container {
  margin-bottom: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  overflow: hidden;
}

.course-header,
.semester-header {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 0.5fr;
  gap: 1rem;
  padding: 1rem;
  background-color: rgba(255, 255, 255, 0.1);
  font-weight: 600;
}

.course-row,
.semester-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 0.5fr;
  gap: 1rem;
  padding: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  align-items: center;
}

input {
  padding: 0.75rem;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--white);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
  width: 100%;
}

input:focus {
  outline: none;
  border-color: var(--white);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.1);
}

.btn-remove {
  background-color: transparent;
  border: none;
  color: var(--gray-300);
  cursor: pointer;
  font-size: 1.5rem;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
}

.btn-remove:hover {
  color: var(--white);
  background-color: rgba(255, 255, 255, 0.1);
}

.btn-add {
  background-color: transparent;
  border: 1px dashed rgba(255, 255, 255, 0.3);
  color: var(--white);
  padding: 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  width: 100%;
  transition: var(--transition);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-add:hover {
  background-color: rgba(255, 255, 255, 0.05);
  border-color: var(--white);
}

.plus-icon {
  font-size: 1.25rem;
  font-weight: 300;
}

.result-container {
  display: flex;
  justify-content: space-between;
  margin-bottom: 2rem;
  gap: 1rem;
}

.result-card {
  background-color: var(--white);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  color: var(--black);
  flex: 1;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.result-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(to right, var(--black), var(--gray-600));
}

.result-value {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.result-label {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
  color: var(--gray-600);
}

.action-buttons {
  display: flex;
  gap: 1rem;
}

.btn-calculate,
.btn-reset {
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  flex: 1;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.btn-calculate {
  background-color: var(--white);
  color: var(--black);
}

.btn-calculate:hover {
  background-color: var(--gray-100);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-reset {
  background-color: transparent;
  border: 1px solid var(--white);
  color: var(--white);
}

.btn-reset:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

/* Footer Styles */
.site-footer {
  background-color: rgba(0, 0, 0, 0.8);
  color: var(--gray-300);
  padding: 3rem 0 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: 3rem;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h3 {
  color: var(--white);
  font-size: 1.1rem;
  margin-bottom: 1.2rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.footer-section h3::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40px;
  height: 2px;
  background: var(--white);
}

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

.footer-section li {
  margin-bottom: 0.8rem;
}

.footer-section a {
  color: var(--gray-400);
  transition: var(--transition);
  font-size: 0.9rem;
}

.footer-section a:hover {
  color: var(--white);
  padding-left: 5px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.university-disclaimer {
  text-align: center;
  font-size: 0.85rem;
  color: var(--gray-500);
}

.copyright-social {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.social-links {
  display: flex;
  gap: 1.5rem;
}

.social-links a {
  color: var(--gray-400);
  transition: var(--transition);
}

.social-links a:hover {
  color: var(--white);
  transform: translateY(-3px);
}

.copyright {
  text-align: center;
  font-size: 0.85rem;
  color: var(--gray-500);
}

.copyright a {
  color: var(--gray-300);
  font-weight: 500;
}


.modal {
  color: #000;
  display: none;
  position: fixed;
  z-index: 9999;
  left: 0;
  top: 0;
  width: 100vw;
  height: 100vh;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.modal-content {
  background-color: #fff;
  margin: 10% auto;
  padding: 2rem;
  border-radius: 12px;
  width: 90%;
  max-width: 500px;
  position: relative;
  animation: fadeIn 0.3s ease-in-out;
}

.modal-content h2 {
  margin-top: 0;
}

.modal-content ul {
  padding-left: 1.2rem;
}

.close {
  position: absolute;
  top: 10px;
  right: 16px;
  font-size: 24px;
  font-weight: bold;
  cursor: pointer;
}

@keyframes fadeIn {
  from {
    transform: translateY(-10px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Responsive Footer */
@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .footer-bottom {
    text-align: center;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}
/* Animations */
@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

.highlight {
  animation: pulse 0.6s ease;
}

/* Responsive styles */
@media (max-width: 768px) {
  .container {
    padding: 1.5rem 1rem;
  }

  .calculator-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .tabs {
    flex-direction: column;
    gap: 0.5rem;
  }

  .tab-btn {
    width: 100%;
    padding: 0.75rem;
  }

  .result-container {
    flex-direction: column;
  }

  .action-buttons {
    flex-direction: column;
  }

  .course-header,
  .semester-header {
    display: none;
  }

  .course-row,
  .semester-row {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    padding: 1rem;
    position: relative;
  }

  .course-row input,
  .semester-row input,
  .course-row select,
  .semester-row select {
    margin-bottom: 0.5rem;
  }

  .btn-remove {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .calculator-card {
    padding: 1.5rem;
  }
}