:root {
            --unsa-red: #be1617;
            --unsa-red-dark: #7A1819;
            --unsa-red-light: #C1272D;
            --light: #f8f9fa;
            --dark: #212529;
            --dark-light: #495057;
            --border: #dee2e6;
            --success: #28a745;
            --warning: #E67E22;
            --danger: #dc3545;
            --white: #ffffff;
            --shadow: 0 0.25rem 0.5rem rgba(0,0,0,0.1);
            --border-radius: 0.25rem;
            
            /* Dark */
            --dark-bg: #121212;
            --dark-card: #212121;
            --dark-text: #e0e0e0;
            --dark-border: #333;
            --dark-light-bg: #161515;
        }
        
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            transition: background-color 0.3s, color 0.3s, border-color 0.3s;
        }
        
        body {
            background-color: #f5f5f5;
            color: var(--dark);
            line-height: 1.5;
            font-size: 0.9rem;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        
        body.dark-mode {
            background-color: var(--dark-bg);
            color: var(--dark-text);
        }
        
        .container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 1rem;
            width: 100%;
        }
        
        header {
            background-color: var(--white);
            padding: 0.75rem 0;
        }
        
        body.dark-mode header {
            background-color: var(--dark-card);
            border-bottom: 1px solid var(--dark-border);
        }
        
        .header-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            text-decoration: none;
        }
        
        .logo-img {
            height: 40px;
            width: auto;
        }
        
        .logo-text {
            display: flex;
            flex-direction: column;
        }
        
        .logo-text h1 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--dark);
            margin: 0;
            line-height: 1.2;
        }
        
        body.dark-mode .logo-text h1 {
            color: var(--dark-text);
        }
        
        .logo-text p {
            font-size: 0.8rem;
            color: var(--dark-light);
            margin: 0;
            font-weight: 400;
        }
        
        body.dark-mode .logo-text p {
            color: #aaa;
        }
        
        .header-actions {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .theme-toggle, .menu-toggle {
            background: none;
            border: none;
            cursor: pointer;
            padding: 0.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .theme-toggle svg, .menu-toggle svg {
            width: 24px;
            height: 24px;
            fill: var(--dark);
        }
        
        body.dark-mode .theme-toggle svg,
        body.dark-mode .menu-toggle svg {
            fill: var(--dark-text);
        }
        
        .dropdown-menu {
            position: absolute;
            right: 1rem;
            top: 60px;
            background: var(--white);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            padding: 0.5rem 0;
            min-width: 180px;
            display: none;
            z-index: 100;
        }
        
        body.dark-mode .dropdown-menu {
            background-color: var(--dark-card);
            border: 1px solid var(--dark-border);
        }
        
        .dropdown-menu.show {
            display: block;
        }
        
        .dropdown-menu a {
            display: block;
            padding: 0.5rem 1rem;
            color: var(--dark);
            text-decoration: none;
            font-size: 0.9rem;
        }
        
        body.dark-mode .dropdown-menu a {
            color: var(--dark-text);
        }
        
        .dropdown-menu a:hover {
            background-color: var(--light);
        }
        
        body.dark-mode .dropdown-menu a:hover {
            background-color: var(--dark-light-bg);
        }
        
        main {
            flex: 1;
            padding: 1.5rem 0;
        }
        
        h2 {
            color: var(--dark);
            margin: 0 0 1.25rem;
            text-align: center;
            font-size: 1.25rem;
            font-weight: 500;
        }
        
        body.dark-mode h2 {
            color: var(--dark-text);
        }
        
        .calculator {
            background: var(--white);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            margin-bottom: 1.5rem;
            border: 1px solid var(--border);
        }
        
        body.dark-mode .calculator {
            background-color: var(--dark-card);
            border-color: var(--dark-border);
        }
        
        .units-container {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 0;
        }
        
        .unit {
            padding: 1rem;
            border-right: 1px solid var(--border);
        }
        
        body.dark-mode .unit {
            border-right-color: var(--dark-border);
        }
        
        .unit:last-child {
            border-right: none;
        }
        
        .unit-title {
            font-weight: 600;
            color: var(--unsa-red);
            margin-bottom: 0.75rem;
            font-size: 0.95rem;
            text-align: center;
        }
        
        table {
            width: 100%;
            border-collapse: collapse;
            table-layout: fixed;
        }
        
        th, td {
            padding: 0.4rem;
            text-align: center;
            border-bottom: 1px solid var(--border);
            font-size: 0.85rem;
        }
        
        body.dark-mode th,
        body.dark-mode td {
            border-bottom-color: var(--dark-border);
        }
        
        th {
            font-weight: 600;
            color: var(--dark);
            background-color: transparent;
        }
        
        body.dark-mode th {
            color: var(--dark-text);
        }
        
        .input-group {
            display: flex;
            align-items: center;
        }
        
        .input-group span {
            margin-left: 0.25rem;
            font-size: 0.8rem;
            color: var(--dark-light);
        }
        
        body.dark-mode .input-group span {
            color: #aaa;
        }
        
        input {
            width: 100%;
           padding: 0.2rem 0.5rem;
            border: 1px solid var(--border);
            border-radius: var(--border-radius);
            font-size: 0.85rem;
            text-align: center;
            transition: border-color 0.15s;
            background-color: var(--light);
            color: var(--dark);
        }
        
        body.dark-mode input {
            background-color: #3c3c3c;
            border-color: var(--dark-border);
            color: var(--dark-text);
        }
        
        input:focus {
            outline: none;
            border-color: var(--unsa-red);
        }
        
        .result-container {
            padding: 1rem;
            text-align: center;
            background-color: var(--light);
            border-top: 1px solid var(--border);
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            flex-wrap: wrap;
        }
        
        body.dark-mode .result-container {
            background-color: var(--dark-light-bg);
            border-top-color: var(--dark-border);
        }
        
        .result-box {
            min-width: 120px;
        }
        
        .result-label {
            font-size: 0.85rem;
            color: var(--dark-light);
            margin-bottom: 0.25rem;
        }
        
        body.dark-mode .result-label {
            color: #aaa;
        }
        
        .final-grade {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--unsa-red);
            margin: 0;
        }
        
        .official-grade {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--unsa-red-dark);
            margin: 0;
        }
        
        .btn-container {
            padding: 0 1rem 1rem;
        }
        
        .btn {
            padding: 0.5rem 1rem;
            border: none;
            border-radius: var(--border-radius);
            font-size: 0.85rem;
            cursor: pointer;
            width: 100%;
            background-color: var(--unsa-red);
            color: var(--white);
            font-weight: 500;
            transition: background-color 0.15s;
        }
        
        .btn:hover {
            background-color: var(--unsa-red-dark);
        }
        
        .status-message {
            margin: 0 1rem 0.75rem;
            padding: 0.5rem;
            border-radius: var(--border-radius);
            font-size: 0.8rem;
            text-align: center;
            display: none;
            background-color: rgba(230, 126, 34, 0.1);
            color: var(--warning);
            border: 1px solid rgba(230, 126, 34, 0.2);
        }
        
        body.dark-mode .status-message {
            background-color: rgba(230, 126, 34, 0.2);
            border-color: rgba(230, 126, 34, 0.3);
        }
        
        footer {
            text-align: center;
            padding: 1rem 0;
            color: var(--dark-light);
            font-size: 0.75rem;
            border-top: 1px solid var(--border);
            background-color: var(--white);
        }
        
        body.dark-mode footer {
            background-color: var(--dark-card);
            border-top-color: var(--dark-border);
            color: #aaa;
        }
        
        @media (max-width: 900px) {
            .units-container {
                grid-template-columns: 1fr 1fr;
            }
            
            .unit:nth-child(2) {
                border-right: none;
            }
            
            .unit:last-child {
                grid-column: span 2;
                border-right: none;
                border-top: 1px solid var(--border);
            }
            
            body.dark-mode .unit:last-child {
                border-top-color: var(--dark-border);
            }
        }
        
        @media (max-width: 600px) {

             input {
        padding: 0.4rem 0.6rem; 
        font-size: 0.9rem; 
                          }
    
             .weight-input, .grade-input {
        min-width: 60px; 
                          }

            .units-container {
                grid-template-columns: 1fr;
            }
            
            .unit {
                border-right: none;
                border-bottom: 1px solid var(--border);
            }
            
            body.dark-mode .unit {
                border-bottom-color: var(--dark-border);
            }
            
            .unit:last-child {
                grid-column: span 1;
                border-bottom: none;
            }
            
            .result-container {
                gap: 1rem;
                flex-direction: column;
                align-items: center;
            }
            
            th, td {
                padding: 0.4rem;
                font-size: 0.8rem;
            }
        }



   
input[type="number"] {
    -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0; 
}


.instructions {
  background-color: var(--light);
  padding: 1.5rem 1rem;
  border-radius: var(--border-radius);
  margin-bottom: 1.5rem;
  border: 1px solid var(--border);
}

body.dark-mode .instructions {
  background-color: var(--dark-card);
  border-color: var(--dark-border);
}

.instructions h2 {
  font-size: 1.05rem;
  margin: 1rem 0 0.5rem;
  color: var(--unsa-red);
}

.instructions p,
.instructions li {
  font-size: 0.95rem;
  line-height: 1.4;
  margin-bottom: 0.5rem;
}

.instructions .intro {
  font-weight: 500;
  margin-bottom: 1rem;
}






.reset-buttons {
  display: flex;
  gap: 8px;          
  margin-top: 12px;
  flex-wrap: wrap;   
}


.reset-buttons .btn {
  flex: 1;           
  min-width: 100px;   
  padding: 7px 11px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  color: #fff;
}


.btn-danger {
  background-color: var(--danger, #e74c3c);
}

.btn-warning {
  background-color: #168db4;
}

.btn-secondary {
  background-color: #187a6e;
}


.result-message {
  margin-top: 1rem;
  text-align: center;
  font-size: 1rem;
  font-weight: 600;
  color: var(--dark);
}
body.dark-mode .result-message {
  color: var(--dark-text); 
}

.instructions h2 {
  font-size: 1.4rem;
  font-weight: bold;
  text-align: center;
  margin: 1.5rem 0 1rem;
  color: #333;
  position: relative;
}

.instructions h2::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  background: #ff4d4d;  
  margin: 0.5rem auto 0;
  border-radius: 2px;
}




@media all and (display-mode: standalone) {
  .instructions {
    display: none !important;
  }
  .download-app {
    display: none !important;
  }
}





.download-app {
  text-align: center;
  padding: 2rem 1rem;
  margin: 2rem auto;
  max-width: 500px;
  border-radius: 16px;
  background: var(--white);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  transition: background 0.3s, color 0.3s;
}

.download-app h2 {
  font-size: 1.3rem;
  margin-bottom: 0.3rem;
  font-weight: 600;
  color: var(--dark);
}

.download-app p {
  font-size: 0.95rem;
  margin-bottom: 1rem;
  color: var(--dark-light);
}

#install-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: #34a853; 
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 0.6rem 1.2rem; 
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.2s, background 0.3s;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

#install-btn:hover {
  background: #2c8e46;
  transform: translateY(-2px);
}

#install-btn svg {
  width: 20px;
  height: 20px;
  fill: white;
}


body.dark-mode .download-app {
  background: var(--dark-card);
  color: var(--dark-text);
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

body.dark-mode .download-app p {
  color: #aaa;
}


@media (max-width: 600px) {
  #install-btn {
    width: auto;           
    font-size: 0.9rem;     
    padding: 0.55rem 1rem; 
  }
}