/* Base Styles */
:root {
    --blue-600: #2563eb;
    --blue-500: #3b82f6;
    --blue-400: #60a5fa;
    --blue-300: #93c5fd;
    --blue-200: #bfdbfe;
    --blue-100: #dbeafe;
    --blue-50: #eff6ff;
    
    --purple-600: #9333ea;
    --purple-500: #a855f7;
    --purple-200: #e9d5ff;
    --purple-100: #f3e8ff;
    --purple-50: #faf5ff;
    
    --green-600: #16a34a;
    --green-500: #22c55e;
    --green-200: #bbf7d0;
    --green-100: #dcfce7;
    --green-50: #f0fdf4;
    
    --gray-800: #1f2937;
    --gray-700: #374151;
    --gray-600: #4b5563;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --gray-50: #f9fafb;
    
    --white: #ffffff;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--white);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--gray-800);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1rem;
}

a {
    text-decoration: none;
    color: var(--blue-600);
    transition: color 0.2s;
}

a:hover {
    color: var(--blue-500);
}

button {
    cursor: pointer;
    border: none;
    font-family: inherit;
}

/* Header Styles */
.header {
    background: linear-gradient(to right, var(--blue-600), var(--purple-600));
    color: var(--white);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    flex-direction: row;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.calculator-icon {
    width: 2rem;
    height: 2rem;
}

.desktop-nav {
    display: none;
}

.nav-link {
    color: var(--white);
    font-weight: 500;
    padding: 0.5rem 1rem;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--blue-200);
}

/* .cta-button {
    background-color: var(--white);
    color: var(--blue-600);
    font-weight: 700;
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    transition: background-color 0.2s;
}

.cta-button:hover {
    background-color: var(--blue-100);
} */

/* .desktop-cta {
    display: none;
} */

.mobile-menu-button {
    background: transparent;
    color: var(--white);
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: auto;
}

.mobile-nav {
    display: none;
    flex-direction: column;
    padding-bottom: 1rem;
}

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

.mobile-nav .nav-link {
    padding: 0.75rem 0;
}

/* .mobile-nav .cta-button {
    margin-top: 0.5rem;
    width: 100%;
    text-align: center;
} */

/* Hero Banner Styles */


.hero-banner {
  position: relative;
  background-image: url('./img/hero-banner.jpg');
  background-size: cover;
  background-position: center;
  color: #ffffff; 
  text-align: center;
  padding: 100px 0; 
}

.hero-banner::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6); 
  z-index: 1; 
}

.container {
  position: relative;
  z-index: 2; 
}















.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.hero-text {
    margin-bottom: 2rem;
}

.hero-text h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--white);
}

.hero-text p {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
}

.hero-cta {
    font-size: 1.125rem;
    padding: 0.75rem 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.calculator-card {
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0.5rem;
    padding: 1.5rem;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

.calculator-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.calculator-scale {
    background-color: rgba(59, 130, 246, 0.3);
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
}

.course-list {
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 0.375rem;
    padding: 1rem;
    margin-bottom: 1rem;
}

.course-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.course-item:last-child {
    margin-bottom: 0;
}

.grade {
    font-weight: 700;
}

.gpa-result {
    background-color: var(--blue-600);
    border-radius: 0.375rem;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.gpa-value {
    font-size: 1.5rem;
    font-weight: 700;
}

/* How to Calculate Section Styles */
.how-to-calculate {
    padding: 4rem 0;
    background-color: var(--gray-50);
}

.content-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.section-block {
    margin-bottom: 2.5rem;
}

.steps-card {
    background-color: var(--white);
    border-radius: 0.5rem;
    padding: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 1.5rem;
}

.steps-list {
    list-style-position: inside;
    counter-reset: step-counter;
}

.steps-list li {
    margin-bottom: 1rem;
    counter-increment: step-counter;
}

.step-title {
    color: var(--blue-600);
    font-weight: 500;
    display: inline-block;
    margin-left: 0.5rem;
}

.steps-list li::before {
    content: counter(step-counter) ".";
    font-weight: 700;
}

.steps-list li p {
    margin-left: 1.5rem;
    margin-top: 0.25rem;
}

.formula-card {
    background-color: var(--blue-50);
    border: 1px solid var(--blue-200);
    border-radius: 0.5rem;
    padding: 1.5rem;
    text-align: center;
    margin-bottom: 1.5rem;
}

.formula-title {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--blue-800);
    margin-bottom: 0.5rem;
}

.formula {
    background-color: var(--white);
    padding: 1rem;
    border-radius: 0.375rem;
    display: inline-block;
}

.formula p {
    font-size: 1.25rem;
    margin-bottom: 0;
}

.example-card {
    background-color: var(--white);
    border-radius: 0.5rem;
    padding: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 1.5rem;
}

.example-card h5 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.example-table {
    width: 100vw;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

.example-table th,
.example-table td {
    border: 1px solid var(--gray-300);
    padding: 0.5rem;
    text-align: left;
}

.example-table th {
    background-color: var(--gray-100);
}

.example-table tr:nth-child(even) {
    background-color: var(--gray-50);
}

.total-row {
    background-color: var(--gray-100);
    font-weight: 500;
}

.calculation-result {
    color: var(--gray-700);
}

.result {
    font-weight: 700;
}

.comparison-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.comparison-card {
    background-color: var(--white);
    border-radius: 0.5rem;
    padding: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.comparison-card h4 {
    margin-bottom: 0.75rem;
}

.unweighted h4 {
    color: var(--blue-600);
}

.weighted h4 {
    color: var(--purple-600);
}

.example-box {
    background-color: var(--gray-50);
    padding: 0.75rem;
    border-radius: 0.375rem;
    margin-top: 1rem;
}

.example-title {
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.example-result {
    font-weight: 500;
    display: block;
    margin-top: 0.5rem;
}

/* Key Features Section Styles */
.key-features {
    padding: 4rem 0;
    background-color: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-bottom: 4rem;
}

.feature-card {
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.blue {
    background: linear-gradient(to bottom right, var(--blue-50), var(--blue-100));
    border: 1px solid var(--blue-200);
}

.blue h3 {
    color: var(--blue-700);
}

.purple {
    background: linear-gradient(to bottom right, var(--purple-50), var(--purple-100));
    border: 1px solid var(--purple-200);
}

.purple h3 {
    color: var(--purple-700);
}

.green {
    background: linear-gradient(to bottom right, var(--green-50), var(--green-100));
    border: 1px solid var(--green-200);
}

.green h3 {
    color: var(--green-700);
}

.feature-icon {
    background-color: var(--blue-500);
    color: var(--white);
    width: 3rem;
    height: 3rem;
    border-radius: 9999px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.purple .feature-icon {
    background-color: var(--purple-500);
}

.green .feature-icon {
    background-color: var(--green-500);
}

.benefits-card {
    background-color: var(--blue-600);
    color: var(--white);
    border-radius: 0.75rem;
    padding: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.benefits-card h3 {
    color: var(--white);
    text-align: center;
    margin-bottom: 1.5rem;
}

.benefits-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.benefit h4 {
    color: var(--white);
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.benefit p {
    color: var(--white);
    opacity: 0.9;
    margin-bottom: 0;
}

/* FAQ Section Styles */
.faq-section {
    padding: 4rem 0;
    background-color: var(--gray-50);
}

.faq-wrapper {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.faq-card {
    background-color: var(--white);
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.faq-card h3 {
    color: var(--blue-700);
    margin-bottom: 1rem;
}

.faq-card h4 {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.table-wrapper {
    overflow-x: auto;
    margin: 1.5rem 0;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
    border: 1px solid var(--blue-200);
    padding: 0.75rem;
    text-align: left;
}

.comparison-table th {
    background-color: var(--blue-100);
}

.comparison-table tr:nth-child(even) {
    background-color: var(--gray-50);
}

.comparison-box {
    background-color: var(--blue-50);
    border: 1px solid var(--blue-200);
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.comparison-box h4 {
    text-align: center;
    margin-bottom: 1rem;
}

.comparison-columns {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.comparison-column h5 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
}

.check-list,
.x-list {
    list-style: none;
}

.check-list li,
.x-list li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.check-list li::before {
    content: "✓";
    color: var(--green-500);
    position: absolute;
    left: 0;
    font-weight: 700;
}

.x-list li::before {
    content: "✗";
    color: var(--red-500);
    position: absolute;
    left: 0;
    font-weight: 700;
}

.faq-item {
    margin-bottom: 1.5rem;
}

.faq-item:last-child {
    margin-bottom: 0;
}

.faq-item h4 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

/* Call to Action Section Styles */
.cta-section {
    background: linear-gradient(to right, var(--blue-600), var(--purple-600));
    color: var(--white);
    padding: 4rem 0;
}

.cta-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.cta-content h2 {
    color: var(--white);
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
}

.stats-card {
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0.5rem;
    padding: 2rem;
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.large {
    font-size: 1.25rem;
    padding: 1rem 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.features-list {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    margin-top: 2rem;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

/* Footer Styles */
.footer {
    background-color: var(--gray-800);
    color: var(--white);
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-column h3 {
    color: var(--white);
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.footer-column p {
    color: var(--gray-300);
    margin-bottom: 1rem;
}

.footer-links,
.footer-contact {
    list-style: none;
}

.footer-links li,
.footer-contact li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--gray-300);
    transition: color 0.2s;
    text-decoration: none;
}

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

.footer-contact li {
    color: var(--gray-300);
}

.newsletter-form {
    display: flex;
    margin-top: 0.5rem;
}

.newsletter-input {
    flex-grow: 1;
    padding: 0.5rem 0.75rem;
    border: none;
    border-radius: 0.25rem 0 0 0.25rem;
    font-family: inherit;
}

.newsletter-button {
    background-color: var(--blue-600);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 0 0.25rem 0.25rem 0;
    transition: background-color 0.2s;
}

.newsletter-button:hover {
    background-color: var(--blue-700);
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.footer-bottom p {
    color: var(--gray-400);
    margin-bottom: 0;
}

.footer-legal {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.footer-legal a {
    color: var(--gray-400);
    font-size: 0.875rem;
    transition: color 0.2s;
}

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

/* Media Queries */
@media (min-width: 640px) {
    .hero-text h1 {
        font-size: 2.5rem;
    }
    
    .stats-card {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .features-list {
        flex-direction: row;
        justify-content: center;
        gap: 2rem;
    }
}

@media (min-width: 768px) {
  .desktop-nav {
    display: flex;
    gap: 1rem;
    justify-content: center;
    align-items: center;
}

    @media (min-width: 1025px) {
      .desktop-nav {
          margin-right: 120px; /* Adjust this value as needed */
      }
  }
    
    .desktop-cta {
        display: block;
    }
    
    .mobile-menu-button {
        display: none;
    }
    
    .hero-content {
        flex-direction: row;
        text-align: left;
        gap: 2rem;
        align-items: center;
    }
    
    .hero-text {
        flex: 1;
        margin-bottom: 0;
    }
    
    .hero-calculator {
        flex: 1;
    }
    
    .comparison-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .comparison-columns {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

@media (min-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Base styles and variables */
:root {
    --primary: #4CAF50;
    --primary-hover: #3d8b40;
    --background: #ffffff;
    --foreground: #0f172a;
    --card: #ffffff;
    --card-foreground: #0f172a;
    --border: #e2e8f0;
    --input: #e2e8f0;
    --ring: #4CAF50;
    --radius: 0.5rem;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  }
  

  
  /* Reset and base styles */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  html, body {
    height: 100%;
    font-family: var(--font-sans);
    background-color: var(--background);
    color: var(--foreground);
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
  
  .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;
  }
  
  .hidden {
    display: none !important;
  }
  
  /* Layout */
  .app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
  }
  
  .container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
  }
  
  .header {
    position: sticky;
    top: 0;
    z-index: 10;
    background-color: var(--background);
    border-bottom: 1px solid var(--border);
  }
  
  .header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
  }
  
  .site-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
  }
  
  .theme-toggles {
    display: flex;
    gap: 0.5rem;
  }
  
  .theme-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background-color: transparent;
    color: var(--foreground);
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s, border-color 0.2s;
  }
  
  .theme-button:hover {
    background-color: var(--input);
  }
  
  .theme-button svg {
    width: 1.25rem;
    height: 1.25rem;
  }
  
  .main-content {
    flex: 1;
    padding: 2rem 0;
  }
  
  /* .content-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  @media (min-width: 1024px) {
    .content-grid {
      grid-template-columns: 2fr 1fr;
    }
  } */
  
  /* Calculator Tabs */
  .calculator-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1rem;
  }
  
  .tab-button {
    padding: 0.75rem 1rem;
    background-color: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--foreground);
    font-weight: 500;
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s;
  }
  
  .tab-button:hover {
    color: #2196F3;
  }
  
  .tab-button.active {
    color: #2196F3;
    border-bottom-color: #2196F3;
    font-weight: 600;
  }
  
  /* Calculator Panels */
  .calculator-panel {
    display: none;
    background-color: var(--card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
    margin-bottom: 1.5rem;
  }
  
  .calculator-panel.active {
    display: block;
  }
  
  .panel-header {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border);
  }
  
  .panel-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
  }
  
  .panel-description {
    color: var(--foreground);
    opacity: 0.8;
    font-size: 0.875rem;
  }
  
  /* Tables */
  .assignments-table-container,
  .courses-table-container {
    overflow-x: auto;
    margin: 1rem 0;
  }
  
  .assignments-table,
  .courses-table {
    width: 100%;
    border-collapse: collapse;
  }
  
  .assignments-table th,
  .courses-table th {
    text-align: left;
    padding: 0.75rem 1rem;
    font-weight: 600;
    font-size: 0.875rem;
    border-bottom: 1px solid var(--border);
  }
  
  .assignments-table td,
  .courses-table td {
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border);
  }
  
  .drag-column {
    width: 2.5rem;
  }
  
  .delete-column {
    width: 2.5rem;
  }
  
  .drag-handle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    cursor: grab;
    color: var(--foreground);
    opacity: 0.5;
  }
  
  .drag-handle:hover {
    opacity: 0.8;
  }
  
  .drag-handle svg {
    width: 1.25rem;
    height: 1.25rem;
  }
  
  /* Form Elements */
  .input-field {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius);
    border: 1px solid var(--input);
    background-color: transparent;
    color: var(--foreground);
    font-size: 0.875rem;
    transition: border-color 0.2s;
  }
  
  .input-field:focus {
    outline: none;
    border-color: var(--ring);
    box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.2);
  }
  
  .form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 1.25rem;
  }
  
  @media (min-width: 640px) {
    .form-grid {
      grid-template-columns: 1fr 1fr;
    }
  }
  
  .form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .form-group.full-width {
    grid-column: 1 / -1;
  }
  
  .form-group label {
    font-size: 0.875rem;
    font-weight: 500;
  }
  
  /* Buttons */
  .add-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    margin: 1rem;
    border-radius: var(--radius);
    border: 1px solid var(--primary);
    background-color: transparent;
    color: var(--primary);
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
  }
  
  .add-button:hover {
    background-color: var(--primary);
    color: white;
  }
  
  .add-button svg {
    width: 1rem;
    height: 1rem;
  }
  
  .calculate-button {
    display: block;
    width: calc(100% - 2.5rem);
    margin: 1.25rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    border: none;
    background-color: var(--blue-600);
    color: white;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
  }
  
  .calculate-button:hover {
    background-color: var(--blue-500);
  }
  
  .delete-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background-color: transparent;
    color: #ef4444;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s, border-color 0.2s;
  }
  
  .delete-button:hover {
    background-color: #fee2e2;
    border-color: #ef4444;
  }
  
  .delete-button svg {
    width: 1rem;
    height: 1rem;
  }
  
  /* Results */
  .results-container {
    padding: 1.25rem;
    border-top: 1px solid var(--border);
  }
  
  .result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
  }
  
  .result-row:last-child {
    margin-bottom: 0;
  }
  
  .final-result {
    font-size: 1.25rem;
    font-weight: 700;
  }
  
  .final-grade-result {
    padding: 1.25rem;
    margin: 0 1.25rem 1.25rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    text-align: center;
  }
  
  .required-grade {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin: 1rem 0;
  }
  
  .warning {
    color: #ef4444;
    font-size: 0.875rem;
  }
  
  /* Export Panel */
  .export-panel {
    background-color: var(--card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
  }
  
  .export-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1.25rem;
  }
  
  @media (min-width: 640px) {
    .export-buttons {
      flex-direction: row;
    }
  }
  
  .export-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    border: none;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
    flex: 1;
  }
  
  .export-button svg {
    width: 1rem;
    height: 1rem;
  }
  
  .pdf-button {
    background-color: #7f1d1d;
    color: white;
  }
  
  .pdf-button:hover {
    background-color: #991b1b;
  }
  
  .csv-button {
    background-color: #1e40af;
    color: white;
  }
  
  .csv-button:hover {
    background-color: #1e3a8a;
  }
  
  /* Visualization Panels */
  .visualization-panel {
    background-color: var(--card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
    margin-bottom: 1.5rem;
  }
  
  .grade-summary {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem 1.25rem;
    text-align: center;
  }
  
  .summary-grade {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary);
  }
  
  .summary-letter {
    font-size: 2rem;
    font-weight: 600;
    margin: 0.5rem 0;
  }
  
  .summary-gpa {
    font-size: 1.25rem;
  }
  
  .chart-container {
    padding: 1.25rem;
    height: 300px;
    position: relative;
  }
  
  .no-data-message {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--foreground);
    opacity: 0.5;
    text-align: center;
  }
  
  .chart {
    width: 100%;
    height: 100%;
  }
  

  /* Drag and Drop */
  .dragging {
    opacity: 0.5;
    background-color: var(--input);
  }
  
  /* Accessibility */
  button:focus,
  input:focus,
  a:focus {
    outline: 2px solid var(--ring);
    outline-offset: 2px;
  }
  
  button:focus:not(:focus-visible),
  input:focus:not(:focus-visible),
  a:focus:not(:focus-visible) {
    outline: none;
  }
  
  /* Responsive adjustments */
  @media (max-width: 640px) {
    
    .panel-title {
      font-size: 1.125rem;
    }
    
    .summary-grade {
      font-size: 2.5rem;
    }
    
    .summary-letter {
      font-size: 1.75rem;
    }
    
    .calculator-tabs {
      overflow-x: auto;
      white-space: nowrap;
    }
  }







































  /* CSS Custom Properties */
:root {
  /* Colors */
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-secondary: #64748b;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #6366f1;
  
  /* Theme Colors */
  --color-easy-grader: #8b5cf6;
  --color-average-grade: #14b8a6;
  --color-final-grade: #6366f1;
  
  /* Neutral Colors */
  --color-white: #ffffff;
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 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;
  
  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Reset and Base Styles */


/* .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
} */

/* Header Styles */
.header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  flex-direction: row;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.logo-icon svg {
  display: block;
}

.logo-text h1 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-1);
}

.logo-text p {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

.nav {
  display: flex;
  gap: var(--spacing-2);
}

.nav-btn {
  padding: var(--spacing-3) var(--spacing-5);
  border: none;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
  background-color: transparent;
  color: var(--color-gray-600);
}

.nav-btn:hover {
  background-color: var(--color-gray-100);
  color: var(--color-gray-900);
}

.nav-btn.active {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* Main Content */
.main {
  padding: var(--spacing-8) 0;
  min-height: calc(100vh - 200px);
}

/* Calculator Sections */
.calculator-section {
  display: none;
}

.calculator-section.active {
  display: block;
}

.calculator-card {
  background-color: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  max-width: 800px;
  margin: 0 auto;
}

.calculator-header {
  padding: var(--spacing-8) var(--spacing-8) var(--spacing-6);
  text-align: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
}

.calculator-header h2 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--spacing-2);
}

.calculator-header p {
  font-size: var(--font-size-lg);
  opacity: 0.9;
}

.calculator-content {
  padding: var(--spacing-8);
}

/* Input Styles */
.input-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-6);
  margin-bottom: var(--spacing-8);
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.input-group label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-gray-700);
}

.input-field {
  padding: var(--spacing-4);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-lg);
  font-weight: 500;
  transition: all var(--transition-normal);
  background-color: var(--color-white);
}

.input-field:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgb(59 130 246 / 0.1);
}

.input-field.primary {
  border-color: var(--color-error);
}

.input-field.primary:focus {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgb(239 68 68 / 0.1);
}

.input-field.secondary {
  border-color: var(--color-info);
}

.input-field.secondary:focus {
  border-color: var(--color-info);
  box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
}

.input-field.success {
  border-color: var(--color-success);
}

.input-field.success:focus {
  border-color: var(--color-success);
  box-shadow: 0 0 0 3px rgb(16 185 129 / 0.1);
}

.input-field.warning {
  border-color: var(--color-warning);
}

.input-field.warning:focus {
  border-color: var(--color-warning);
  box-shadow: 0 0 0 3px rgb(245 158 11 / 0.1);
}

.input-field.info {
  border-color: var(--color-info);
}

.input-field.info:focus {
  border-color: var(--color-info);
  box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
}

.input-with-unit {
  position: relative;
  display: flex;
  align-items: center;
}

.input-with-unit .input-field {
  flex: 1;
  padding-right: var(--spacing-10);
}

.input-with-unit .unit {
  position: absolute;
  right: var(--spacing-4);
  font-size: var(--font-size-lg);
  font-weight: 500;
  color: var(--color-gray-500);
}

/* Result Styles */
.result-section {
  margin-bottom: var(--spacing-8);
}

.result-card {
  background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-white) 100%);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: var(--spacing-8);
  text-align: center;
}

.result-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-4);
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--color-gray-900);
}

.equals {
  color: var(--color-gray-400);
  font-weight: 400;
}

/* Toggle Options */
.options-section {
  display: flex;
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-8);
  justify-content: center;
}

.toggle-option {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-gray-700);
}

.toggle-option input[type="checkbox"] {
  display: none;
}

.toggle-slider {
  width: 44px;
  height: 24px;
  background-color: var(--color-gray-300);
  border-radius: 12px;
  position: relative;
  transition: all var(--transition-normal);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--color-white);
  top: 2px;
  left: 2px;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.toggle-option input[type="checkbox"]:checked + .toggle-slider {
  background-color: var(--color-primary);
}

.toggle-option input[type="checkbox"]:checked + .toggle-slider::before {
  transform: translateX(20px);
}

/* Grading Chart */
.grading-chart {
  margin-top: var(--spacing-8);
  padding-top: var(--spacing-8);
  border-top: 1px solid var(--color-gray-200);
}

.grading-chart.hidden {
  display: none;
}

.grading-chart h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-4);
  text-align: center;
}

.chart-table {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.chart-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background-color: var(--color-gray-100);
  font-weight: 600;
  color: var(--color-gray-900);
}

.chart-header span {
  padding: var(--spacing-4);
  text-align: center;
  border-right: 1px solid var(--color-gray-200);
}

.chart-header span:last-child {
  border-right: none;
}

.chart-content {
  max-height: 300px;
  overflow-y: auto;
}

.chart-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--color-gray-200);
}

.chart-row:last-child {
  border-bottom: none;
}

.chart-row:nth-child(even) {
  background-color: var(--color-gray-50);
}

.chart-row span {
  padding: var(--spacing-3) var(--spacing-4);
  text-align: center;
  border-right: 1px solid var(--color-gray-200);
}

.chart-row span:last-child {
  border-right: none;
}

/* Grade Type Selector */
.grade-type-selector {
  display: flex;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-8);
  justify-content: center;
}

.type-btn {
  padding: var(--spacing-3) var(--spacing-6);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
  background-color: var(--color-white);
  color: var(--color-gray-600);
}

.type-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.type-btn.active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

/* Grades Input Section */
.grades-input-section {
  margin-bottom: var(--spacing-8);
}

.grades-header {
  display: grid;
  grid-template-columns: 60px 1fr 1fr;
  gap: var(--spacing-4);
  padding: var(--spacing-4);
  background-color: var(--color-gray-100);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  font-weight: 600;
  color: var(--color-gray-900);
  text-align: center;
}

.grades-list {
  border: 1px solid var(--color-gray-200);
  border-top: none;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  background-color: var(--color-white);
}

.grade-row {
  display: grid;
  grid-template-columns: 60px 1fr 1fr;
  gap: var(--spacing-4);
  padding: var(--spacing-4);
  border-bottom: 1px solid var(--color-gray-200);
  align-items: center;
}

.grade-row:last-child {
  border-bottom: none;
}

.grade-row .row-number {
  text-align: center;
  font-weight: 500;
  color: var(--color-gray-600);
}

.grade-row .input-field {
  margin: 0;
}

.grades-actions {
  display: flex;
  gap: var(--spacing-4);
  margin-top: var(--spacing-6);
  justify-content: center;
}

/* Buttons */
.btn-secondary {
  padding: var(--spacing-3) var(--spacing-6);
  border: none;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-secondary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  padding: var(--spacing-3) var(--spacing-6);
  border: 2px solid var(--color-gray-300);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
  background-color: var(--color-white);
  color: var(--color-gray-600);
}

.btn-outline:hover {
  border-color: var(--color-gray-400);
  color: var(--color-gray-900);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* Target Grade Section */
.target-grade-section {
  margin-bottom: var(--spacing-8);
  padding: var(--spacing-6);
  background-color: var(--color-gray-50);
  border-radius: var(--radius-lg);
}

/* Average Results */
.average-results {
  display: grid;
  gap: var(--spacing-4);
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-4);
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
}

.result-label {
  font-weight: 500;
  color: var(--color-gray-700);
}

.result-value {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-primary);
}

/* Final Grade Specific Styles */
.final-inputs-section {
  display: grid;
  gap: var(--spacing-6);
  margin-bottom: var(--spacing-8);
}

.final-actions {
  display: flex;
  justify-content: center;
  margin-bottom: var(--spacing-8);
}

.final-result-section .result-card {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  border: none;
}

.final-result-section h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--spacing-4);
  opacity: 0.9;
}

.final-result-display {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  margin-bottom: var(--spacing-4);
}

.result-message {
  font-size: var(--font-size-lg);
  opacity: 0.9;
}

/* Footer */
.footer {
  background-color: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: var(--spacing-8) 0;
  text-align: center;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
      padding: 0 var(--spacing-3);
  }
  
  .header-content {
      flex-direction: row;
      padding: 0.75rem 1rem;
  }
  
  .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
  }
  
  .nav {
      width: 100%;
      justify-content: center;
  }
  
  .nav-btn {
      flex: 1;
      text-align: center;
  }
  
  .input-section {
      grid-template-columns: 1fr;
      gap: var(--spacing-4);
  }
  
  .result-display {
      font-size: var(--font-size-3xl);
      flex-direction: column;
      gap: var(--spacing-2);
  }
  
  .options-section {
      flex-direction: column;
      align-items: center;
      gap: var(--spacing-4);
  }
  
  .grades-header,
  .grade-row {
      grid-template-columns: 40px 1fr 1fr;
      gap: var(--spacing-2);
  }
  
  .grades-actions {
      flex-direction: column;
      align-items: center;
  }
  
  .grade-type-selector {
      flex-direction: column;
      align-items: center;
  }
  
  .type-btn {
      width: 200px;
  }
  
  .calculator-content {
      padding: var(--spacing-6);
  }
  
  .calculator-header {
      padding: var(--spacing-6);
  }
  
  .calculator-header h2 {
      font-size: var(--font-size-2xl);
  }
}

@media (max-width: 480px) {
  .final-result-display {
      font-size: var(--font-size-3xl);
  }
  
  .result-display {
      font-size: var(--font-size-2xl);
  }
  
  .calculator-header h2 {
      font-size: var(--font-size-xl);
  }
}