.course-header {
    padding: 60px 20px !important;
    background: linear-gradient(135deg, #fce4ec, #f8bbd9, #fce4ec) !important;
    background-size: 400% 400%;
    animation: helloKittyGradient 15s ease infinite;
}

@keyframes helloKittyGradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.back-btn {
    display: inline-block;
    color: #ffffff;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 30px;
    padding: 12px 28px;
    background: linear-gradient(135deg, #ffb6c1, #ff91a4);
    border-radius: 25px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 182, 193, 0.4);
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.back-btn:hover {
    background: linear-gradient(135deg, #ff91a4, #ff7a8a);
    transform: translateX(-5px);
    box-shadow: 0 6px 20px rgba(255, 182, 193, 0.5);
}

.course-icon-large {
    font-size: 5rem;
    margin-bottom: 20px;
    animation: helloKittyBounce 2s ease-in-out infinite;
}

@keyframes helloKittyBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.course-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #5a4a4a;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.1);
    letter-spacing: 2px;
}

.course-meta {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.meta-item {
    font-size: 1.1rem;
    color: #6a5a5a;
    background: rgba(255, 255, 255, 0.6);
    padding: 10px 20px;
    border-radius: 20px;
}

.course-main {
    max-width: 1000px;
    margin: 0 auto;
}

.course-info-section {
    margin-bottom: 60px;
}

.info-card {
    background: var(--white);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-light);
}

.course-description {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-dark);
}

.objectives-list {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.objective-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.objective-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    min-width: 60px;
}

.objective-content h4 {
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.objective-content p {
    color: var(--text-light);
    line-height: 1.6;
}

.prerequisites {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.prerequisite-tag {
    background: linear-gradient(135deg, #f8d7da, #f5e6e8);
    color: #5a4a4a;
    padding: 10px 25px;
    border-radius: 25px;
    font-weight: 500;
}

.syllabus-section {
    margin-bottom: 60px;
}

.module-list {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.module-card {
    background: var(--white);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: all 0.3s ease;
}

.module-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.module-header {
    background: linear-gradient(135deg, #f8d7da, #f5e6e8);
    padding: 25px 30px;
}

.module-week {
    display: inline-block;
    background: rgba(255, 255, 255, 0.7);
    color: #5a4a4a;
    padding: 6px 16px;
    border-radius: 15px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 12px;
}

.module-title {
    font-size: 1.4rem;
    color: #5a4a4a;
    margin: 0;
}

.module-content {
    padding: 30px;
}

.module-topics {
    list-style: none;
    margin: 0 0 20px 0;
    padding: 0;
}

.module-topics li {
    padding: 10px 0;
    padding-left: 25px;
    position: relative;
    color: var(--text-dark);
}

.module-topics li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

.module-practice {
    background: linear-gradient(135deg, #fff5f5, #fef9f9);
    padding: 15px 20px;
    border-radius: 12px;
    color: #5a4a4a;
    font-size: 1rem;
}

.tools-section {
    margin-bottom: 60px;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.tool-card {
    background: linear-gradient(135deg, #fff5f7, #ffeef2);
    border-radius: 20px;
    padding: 30px 20px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(255, 182, 193, 0.2);
    transition: all 0.3s ease;
    border: 2px solid #ffe4ec;
}

.tool-card:hover {
    transform: translateY(-8px) rotate(2deg);
    box-shadow: 0 10px 30px rgba(255, 182, 193, 0.3);
}

.tool-icon {
    font-size: 3.5rem;
    margin-bottom: 15px;
    animation: helloKittyWiggle 3s ease-in-out infinite;
}

@keyframes helloKittyWiggle {
    0%, 100% { transform: rotate(-3deg); }
    50% { transform: rotate(3deg); }
}

.tool-card h4 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.tool-card p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin: 0;
}

.assessment-section {
    margin-bottom: 60px;
}

.assessment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
}

.assessment-item {
    background: var(--white);
    border-radius: 20px;
    padding: 35px 25px;
    text-align: center;
    box-shadow: var(--shadow-light);
    position: relative;
    overflow: hidden;
}

.assessment-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.assessment-score {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, #d4a5a5, #e8b4b4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 15px;
}

.assessment-item h4 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.assessment-item p {
    color: var(--text-light);
    font-size: 0.95rem;
    margin: 0;
}

.python-exercise {
    margin-top: 25px;
    border-top: 1px solid #f0e6e6;
    padding-top: 25px;
}

.exercise-toggle {
    width: 100%;
    background: linear-gradient(135deg, #ffb6c1, #ff91a4);
    color: white;
    border: none;
    padding: 14px 20px;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 182, 193, 0.4);
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.exercise-toggle:hover {
    background: linear-gradient(135deg, #ff91a4, #ff7a8a);
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 25px rgba(255, 182, 193, 0.5);
}

.exercise-content {
    margin-top: 20px;
    display: none;
}

.exercise-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

.exercise-section {
    background: #fffaf8;
    border-radius: 16px;
    padding: 25px;
    margin-bottom: 20px;
    border: 1px solid #f0e6e6;
}

.exercise-section:last-child {
    margin-bottom: 0;
}

.exercise-section h4 {
    font-size: 1.15rem;
    color: #5a4a4a;
    margin-bottom: 10px;
}

.exercise-desc {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 15px;
}

.code-block {
    background: #2d2d2d;
    color: #e0e0e0;
    padding: 20px;
    border-radius: 12px;
    overflow-x: auto;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 15px;
}

.code-block code {
    color: inherit;
}

.code-editor-container {
    margin-bottom: 15px;
}

.editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #1e1e1e;
    padding: 10px 15px;
    border-radius: 12px 12px 0 0;
}

.editor-title {
    color: #888;
    font-size: 0.85rem;
    font-family: 'Consolas', 'Monaco', monospace;
}

.reset-btn {
    background: rgba(255,255,255,0.1);
    color: #aaa;
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.reset-btn:hover {
    background: rgba(255,255,255,0.2);
    color: #fff;
}

.code-editor {
    width: 100%;
    min-height: 200px;
    background: #2d2d2d;
    color: #e0e0e0;
    padding: 20px;
    border: none;
    border-radius: 0 0 12px 12px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    resize: vertical;
    outline: none;
}

.code-editor:focus {
    box-shadow: inset 0 0 0 2px #4a90e2;
}

.exercise-actions {
    display: flex;
    align-items: flex-start;
    gap: 15px;
}

.run-btn {
    background: linear-gradient(135deg, #4a90e2, #357abd);
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: 20px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.run-btn:hover {
    background: linear-gradient(135deg, #357abd, #256acb);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.4);
}

.run-btn:active {
    transform: translateY(0);
}

.code-output {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 10px;
    padding: 15px;
    min-height: 60px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
    color: #2d3748;
    white-space: pre-wrap;
    word-break: break-all;
    flex: 1;
    display: none;
}

.code-output.show {
    display: block;
}

@media (max-width: 768px) {
    .course-title {
        font-size: 2rem;
    }
    
    .course-meta {
        gap: 15px;
    }
    
    .meta-item {
        font-size: 0.95rem;
        padding: 8px 16px;
    }
    
    .info-card {
        padding: 25px;
    }
    
    .objective-item {
        flex-direction: column;
        gap: 10px;
    }
    
    .module-header,
    .module-content {
        padding: 20px;
    }
    
    .module-title {
        font-size: 1.2rem;
    }
    
    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .assessment-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .course-title {
        font-size: 1.6rem;
    }
    
    .course-icon-large {
        font-size: 4rem;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
}