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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 300;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.comment-form {
    padding: 30px;
    border-bottom: 1px solid #eee;
}

.comment-form h3 {
    color: #333;
    margin-bottom: 20px;
    font-size: 1.5rem;
    font-weight: 500;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

button[type="submit"] {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

button[type="submit"]:active {
    transform: translateY(0);
}

.comments-section {
    padding: 30px;
}

.comments-section h3 {
    color: #333;
    margin-bottom: 25px;
    font-size: 1.5rem;
    font-weight: 500;
}

.comments-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.comment {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    border-left: 4px solid #667eea;
    transition: all 0.3s ease;
    animation: slideIn 0.5s ease-out;
}

.comment:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.comment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.comment-author {
    font-weight: 600;
    color: #333;
    font-size: 1.1rem;
}

.comment-date {
    color: #666;
    font-size: 0.9rem;
}

.comment-content {
    color: #555;
    line-height: 1.6;
    font-size: 1rem;
}

.comment-email {
    color: #888;
    font-size: 0.85rem;
    margin-top: 8px;
    font-style: italic;
}

.no-comments {
    text-align: center;
    color: #666;
    font-style: italic;
    padding: 40px 20px;
    background: #f8f9fa;
    border-radius: 12px;
    border: 2px dashed #ddd;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        margin: 10px;
        border-radius: 10px;
    }
    
    header {
        padding: 20px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .comment-form,
    .comments-section {
        padding: 20px;
    }
    
    .comment-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
}

/* Loading animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Reply Feature Styles */
.comment-actions {
    margin-top: 15px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.reply-btn {
    background: linear-gradient(135deg, #28a745, #20c997);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 5px;
}

.reply-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
}

.reply-icon {
    font-size: 1rem;
}

.reply-count {
    color: #666;
    font-size: 0.85rem;
    font-style: italic;
}

.replies {
    margin-top: 20px;
    margin-left: 30px;
    border-left: 3px solid #e9ecef;
    padding-left: 20px;
}

.comment.reply {
    background: #f8f9fa;
    border-left-color: #28a745;
    margin-bottom: 15px;
}

.comment.reply .comment-actions {
    margin-top: 10px;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s ease-out;
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 0;
    border-radius: 15px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    animation: slideInModal 0.3s ease-out;
    overflow: hidden;
}

.modal-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 500;
}

.close {
    color: white;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: opacity 0.3s ease;
    line-height: 1;
}

.close:hover {
    opacity: 0.7;
}

#replyForm {
    padding: 30px;
}

.modal-buttons {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
    margin-top: 20px;
}

.cancel-btn {
    background: #6c757d;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.cancel-btn:hover {
    background: #5a6268;
    transform: translateY(-1px);
}

.submit-btn {
    background: linear-gradient(135deg, #28a745, #20c997);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.submit-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
}

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

@keyframes slideInModal {
    from {
        opacity: 0;
        transform: translateY(-50px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Responsive Design for Modal */
@media (max-width: 768px) {
    .modal-content {
        margin: 10% auto;
        width: 95%;
    }
    
    .modal-header {
        padding: 15px 20px;
    }
    
    .modal-header h3 {
        font-size: 1.3rem;
    }
    
    #replyForm {
        padding: 20px;
    }
    
    .modal-buttons {
        flex-direction: column;
    }
    
    .cancel-btn,
    .submit-btn {
        width: 100%;
    }
    
    .replies {
        margin-left: 15px;
        padding-left: 15px;
    }
}