* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body, html {
            height: 100%;
            width: 100%;
            overflow-x: hidden;
        }

        .header {
            background: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
            color: white;
            padding: 1.5rem 0;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        a{
            text-decoration: none;
        }

        .container {
            width: 95%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }

        .header-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1rem;
        }

        .header-text {
            text-align: center;
        }

        .header h1 {
            font-size: 2rem;
            margin-bottom: 0.5rem;
        }

        .header p {
            font-size: 1rem;
            opacity: 0.9;
        }

        .tab-buttons {
            display: flex;
            gap: 0.5rem;
        }

        .tab-button {
            padding: 0.5rem 1rem;
            background: rgba(255, 255, 255, 0.2);
            border: none;
            border-radius: 20px;
            color: white;
            font-size: 0.9rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .tab-button.active {
            background: white;
            color: #3b82f6;
        }

        .main-content {
            min-height: calc(100vh - 120px);
            padding: 2rem 0;
            background-color: #f8fafc;
        }

        .search-container {
            margin-bottom: 1.5rem;
        }

        .search-box {
            position: relative;
            max-width: 500px;
            margin: 0 auto;
        }

        .search-box input {
            width: 100%;
            padding: 0.75rem 1rem 0.75rem 2.5rem;
            border: 1px solid #d1d5db;
            border-radius: 8px;
            font-size: 1rem;
            transition: all 0.3s ease;
        }

        .search-box input:focus {
            outline: none;
            border-color: #3b82f6;
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
        }

        .search-icon {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: #6b7280;
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
        }

        h2 {
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
            color: #1f2937;
            text-align: center;
        }

        .subjects-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 1.5rem;
        }

        .subject-card {
            background-color: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
            border: 1px solid #e5e7eb;
            box-shadow: 10px 10px 5px 12px lightblue;
        }

        .subject-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
        }

        .card-content {
            padding: 1.5rem;
        }

        .subject-header {
            display: flex;
            align-items: center;
            margin-bottom: 1rem;
        }

        .subject-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            font-size: 1rem;
            color: white;
        }

        .physics-icon {
            background-color: #3b82f6;
        }

        .chemistry-icon {
            background-color: #10b981;
        }

        .math-icon {
            background-color: #8b5cf6;
        }

        .subject-card h3 {
            font-size: 1.2rem;
            color: #1f2937;
        }

        .subject-card p {
            color: #6b7280;
            margin-bottom: 1.5rem;
            font-size: 0.9rem;
        }

        .toggle-syllabus-btn {
            width: 100%;
            padding: 0.75rem;
            background-color: #f3f4f6;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            color: #1f2937;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            font-size: 0.9rem;
        }

        .toggle-syllabus-btn:hover {
            background-color: #e5e7eb;
        }

        .syllabus-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            padding: 0 1.5rem;
        }

        .syllabus-content.show {
            max-height: 1000px;
            padding-bottom: 1.5rem;
        }

        .syllabus-content h4 {
            font-size: 1.1rem;
            margin-bottom: 0.5rem;
            color: #1f2937;
        }

        .syllabus-content ul {
            list-style-type: disc;
            padding-left: 1.5rem;
            color: #4b5563;
            font-size: 0.9rem;
        }

        .syllabus-content li {
            margin-bottom: 0.25rem;
        }

        .footer {
            background-color: #1f2937;
            color: white;
            padding: 1.5rem 0;
        }

        .footer-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1rem;
            margin-bottom: 1rem;
        }

        .footer-text {
            text-align: center;
        }

        .footer h2 {
            font-size: 1.2rem;
            margin-bottom: 0.5rem;
            color: white;
        }

        .footer p {
            opacity: 0.8;
            font-size: 0.9rem;
        }

        .social-links {
            display: flex;
            gap: 0.75rem;
        }

        .social-links a {
            color: white;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background-color: rgba(255, 255, 255, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
        }

        .social-links a:hover {
            background-color: rgba(255, 255, 255, 0.2);
        }

        .footer-bottom {
            text-align: center;
            padding-top: 1rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.8rem;
            opacity: 0.7;
        }

        @media (min-width: 768px) {
            .header-content {
                flex-direction: row;
                justify-content: space-between;
                align-items: center;
            }

            .header-text {
                text-align: left;
            }

            .header h1 {
                font-size: 2.5rem;
            }

            .header p {
                font-size: 1.1rem;
            }

            .tab-buttons {
                gap: 1rem;
            }

            .tab-button {
                padding: 0.75rem 1.5rem;
                font-size: 1rem;
            }

            .footer-content {
                flex-direction: row;
                justify-content: space-between;
                align-items: center;
            }

            .footer-text {
                text-align: left;
            }
        }