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

        :root {
            --primary: #3b82f6;
            --secondary: #1e40af;
            --accent: #06b6d4;
            --success: #10b981;
            --danger: #ef4444;
            --warning: #f59e0b;
            --info: #0ea5e9;
            --dark: #1f2937;
            --light: #f8fafc;
            --glass: rgba(255, 255, 255, 0.92);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: linear-gradient(135deg, #3b82f6 0%, #1e40af 50%, #06b6d4 100%);
            min-height: 100vh;
            padding: 20px;
            position: relative;
            overflow-x: hidden;
        }

        /* Animated background shapes */
        .bg-shape {
            position: fixed;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.1);
            animation: float 20s infinite ease-in-out;
            z-index: 0;
        }

        .shape1 {
            width: 200px;
            height: 200px;
            top: 10%;
            left: 10%;
            animation-delay: 0s;
        }

        .shape2 {
            width: 150px;
            height: 150px;
            top: 70%;
            right: 10%;
            animation-delay: 5s;
        }

        .shape3 {
            width: 100px;
            height: 100px;
            bottom: 10%;
            left: 30%;
            animation-delay: 10s;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0) rotate(0deg); }
            33% { transform: translateY(-30px) rotate(120deg); }
            66% { transform: translateY(30px) rotate(240deg); }
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .header {
            text-align: center;
            margin-bottom: 40px;
            animation: fadeInDown 0.8s ease-out;
        }

      .logo {
  font-size: 5 rem;
  font-weight: 800;
  background: linear-gradient(to bottom right, #FFA726, #FB8C00);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.15);
  display: inline-block;
  animation: fadeInDown 1s ease-out, pulseGlow 4s ease-in-out infinite;
}
@keyframes pulseGlow {
  0% {
    text-shadow: 0 0 5px rgba(255, 140, 0, 0.3);
  }
  50% {
    text-shadow: 0 0 15px rgba(255, 140, 0, 0.6);
  }
  100% {
    text-shadow: 0 0 5px rgba(255, 140, 0, 0.3);
  }
}

.tagline {
  color:white;
  font-size: 1.2rem;
  margin-bottom: 10px;
  text-shadow:2px 2px 4px rgba(0, 0, 0, 0.4) ;
}

.subtitle {
  color: white;
  font-size: 1rem;
  font-style: italic;
}

/* 🔄 Gradient move animation */
@keyframes gradientMove {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

        .main-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }

        .card {
            background: var(--glass);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            padding: 30px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            animation: fadeInUp 0.8s ease-out;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
        }

        .card-title {
            font-size: 1.5rem;
            color: var(--dark);
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .card-icon {
            width: 30px;
            height: 30px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
        }

        .mode-selector {
            display: flex;
            gap: 10px;
            margin-bottom: 30px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .mode-btn {
            padding: 12px 24px;
            border: none;
            border-radius: 10px;
            background: white;
            color: var(--dark);
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        .mode-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }

        .mode-btn.active {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
        }

        .input-group {
            margin-bottom: 20px;
        }

        .input-label {
            display: block;
            color: var(--dark);
            font-weight: 500;
            margin-bottom: 8px;
        }

        .input-field {
            width: 100%;
            padding: 12px 16px;
            border: 2px solid #e2e8f0;
            border-radius: 10px;
            font-size: 1rem;
            transition: all 0.3s ease;
        }

        .input-field:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
        }

        .input-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }

        .subject-inputs {
            max-height: 400px;
            overflow-y: auto;
            padding-right: 10px;
        }

        .subject-item {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 10px;
            margin-bottom: 15px;
            padding: 15px;
            background: rgba(102, 126, 234, 0.05);
            border-radius: 10px;
            animation: slideIn 0.3s ease-out;
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateX(-20px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        .btn {
            padding: 12px 30px;
            border: none;
            border-radius: 10px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
        }

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

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

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

        .btn-group {
            display: flex;
            gap: 15px;
            justify-content: center;
            margin-top: 30px;
            flex-wrap: wrap;
        }

        .results {
            background: linear-gradient(135deg, var(--light), white);
            border-radius: 15px;
            padding: 30px;
            margin-top: 30px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
            display: none;
            animation: fadeIn 0.5s ease-out;
        }

        .results.show {
            display: block;
        }

        .result-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
            border-bottom: 1px solid #e2e8f0;
        }

        .result-item:last-child {
            border-bottom: none;
        }

        .result-label {
            font-weight: 600;
            color: var(--dark);
        }

        .result-value {
            font-size: 1.5rem;
            font-weight: bold;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .grade-badge {
            display: inline-block;
            padding: 8px 20px;
            border-radius: 20px;
            font-weight: bold;
            color: white;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }

        .grade-A { background: var(--success); }
        .grade-B { background: var(--info); }
        .grade-C { background: var(--warning); }
        .grade-D { background: var(--danger); }

        .progress-bar {
            width: 100%;
            height: 10px;
            background: #e2e8f0;
            border-radius: 5px;
            overflow: hidden;
            margin: 10px 0;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            transition: width 1s ease-out;
            border-radius: 5px;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 15px;
            margin: 20px 0;
        }

        .stat-card {
            background: rgba(102, 126, 234, 0.1);
            padding: 15px;
            border-radius: 10px;
            text-align: center;
        }

        .stat-value {
            font-size: 1.5rem;
            font-weight: bold;
            color: var(--primary);
        }

        .stat-label {
            font-size: 0.9rem;
            color: var(--dark);
            margin-top: 5px;
        }

        .tips-card {
            background: rgba(72, 187, 120, 0.1);
            border-left: 4px solid var(--success);
            padding: 20px;
            margin: 20px 0;
            border-radius: 0 10px 10px 0;
        }

        .tips-title {
            font-weight: bold;
            color: var(--success);
            margin-bottom: 10px;
        }

        .loading {
            display: none;
            text-align: center;
            padding: 20px;
        }

        .loading.show {
            display: block;
        }

        .spinner {
            display: inline-block;
            width: 40px;
            height: 40px;
            border: 4px solid rgba(102, 126, 234, 0.3);
            border-top-color: var(--primary);
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes fadeInDown {
            from {
                opacity: 0;
                transform: translateY(-30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .logo {
                font-size: 2.5rem;
            }
            
            .main-content {
                grid-template-columns: 1fr;
            }
            
            .input-row {
                grid-template-columns: 1fr;
            }
            
            .subject-item {
                grid-template-columns: 1fr;
            }
            
            .btn-group {
                flex-direction: column;
            }
            
            .mode-selector {
                flex-direction: column;
            }
            
            .mode-btn {
                width: 100%;
            }
        }

        /* Scrollbar Styling */
        .subject-inputs::-webkit-scrollbar {
            width: 8px;
        }

        .subject-inputs::-webkit-scrollbar-track {
            background: rgba(0, 0, 0, 0.1);
            border-radius: 10px;
        }

        .subject-inputs::-webkit-scrollbar-thumb {
            background: var(--primary);
            border-radius: 10px;
        }

        .subject-inputs::-webkit-scrollbar-thumb:hover {
            background: var(--secondary);
        }
    .footer {
  text-align: center;
  padding: 20px;
  font-size: 1rem;
  color: black;
  background-color: none;
  font-weight: 700;
  color:black;
  animation: fadeIn 2s ease-in-out;
}

/* Heart bounce animation */
.heart {
    color : red;
  display: inline-block;
  animation: bounce 1.2s infinite;
}

/* Fade-in animation for footer */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Bounce effect for heart */
@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-5px);
  }
}