:root {
    --primary-dark: #003366;
    --accent-green: #4CAF50;
    --accent-purple: #8b5cf6;
    --neutral-light: #f8fafc;
    --white: #FFFFFF;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --radius-sm: 8px;
    --radius-md: 12px;
    --transition: all 0.18s ease-out;
}

.comments-section {
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    margin: 0 auto;
}

.section-header {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    background: var(--neutral-light);
    display: flex;
    align-items: center;
    gap: 8px;
}

@media (min-width: 769px) {
    .section-header { padding: 1.5rem 2rem; gap: 12px; }
}

.section-header h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--primary-dark);
    margin: 0;
}

@media (min-width: 769px) {
    .section-header h3 { font-size: 1.375rem; }
}

.comment-icon { font-size: 18px; }

.new-comment-form {
    padding: 12px 16px;
    background: #fafbfc;
    border-bottom: 1px solid var(--border-color);
}

@media (min-width: 769px) {
    .new-comment-form { padding: 1.5rem 2rem; }
}

.comment-input-container {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.comment-avatar {
    width: 28px;
    height: 28px;
    border-radius: 999px;
    object-fit: cover;
    flex-shrink: 0;
    cursor: pointer;
    transition: var(--transition);
}

.comment-avatar:hover {
    transform: scale(1.1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

@media (min-width: 769px) {
    .comment-avatar { width: 40px; height: 40px; }
}

.input-wrapper { flex: 1; min-width: 0; }

.comment-textarea {
    width: 100%;
    min-height: 44px;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 15px;
    resize: vertical;
    background: var(--white);
}

@media (min-width: 769px) {
    .comment-textarea { min-height: 64px; font-size: 1rem; }
}

.comment-textarea:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.12);
}

.form-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    margin-top: 8px;
}

.btn-cancel, .btn-post, .btn-reply {
    padding: 7px 14px;
    border: none;
    border-radius: 999px;
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    min-height: 34px;
    transition: var(--transition);
}

@media (min-width: 769px) {
    .btn-cancel, .btn-post, .btn-reply {
        padding: 0.5rem 1.4rem;
        font-size: 0.9rem;
        min-height: 38px;
    }
}

.btn-cancel {
    background: var(--neutral-light);
    color: var(--text-secondary);
}

.btn-cancel:hover { 
    background: var(--text-secondary); 
    color: white; 
    transform: scale(1.02);
}

.btn-post, .btn-reply {
    background: linear-gradient(135deg, var(--accent-green), #45a049);
    color: white;
}

.btn-post:hover, .btn-reply:hover {
    transform: scale(1.02);
    box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
}

.comments-list {
    max-height: 600px;
    overflow-y: auto;
}

.comment-item {
    padding: 12px 16px;
    border-bottom: 1px solid #f3f4f6;
    transition: var(--transition);
}

.comment-item.highlight {
    background: #fef3c7;
    animation: highlightFade 2s ease-out forwards;
}

@keyframes highlightFade {
    0% { background: #fef3c7; }
    100% { background: transparent; }
}

@media (min-width: 769px) {
    .comment-item { padding: 1.25rem 2rem; }
}

.comment-main {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.comment-content { flex: 1; min-width: 0; }

.comment-header {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 2px;
    flex-wrap: wrap;
}

.comment-author {
    font-weight: 600;
    color: var(--primary-dark);
    font-size: 14px;
    text-decoration: none;
    transition: var(--transition);
}

.comment-author:hover {
    color: var(--accent-green);
    text-decoration: underline;
}

.comment-time {
    color: var(--text-secondary);
    font-size: 12px;
}

.comment-body {
    color: var(--text-primary);
    font-size: 14px;
    margin-top: 2px;
    word-break: break-word;
    line-height: 1.5;
}

.replying-to {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--accent-purple);
    font-size: 12px;
    font-weight: 500;
    margin-bottom: 4px;
    cursor: pointer;
    transition: var(--transition);
}

.replying-to:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.comment-footer {
    display: flex;
    gap: 8px;
    margin-top: 6px;
    flex-wrap: wrap;
}

.comment-action-btn {
    padding: 5px 10px;
    background: transparent;
    border: none;
    border-radius: 999px;
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition);
}

.comment-action-btn:hover {
    background: var(--neutral-light);
    color: var(--accent-green);
    transform: scale(1.05);
}

.comment-action-btn:active {
    transform: scale(0.98);
}

@media (max-width: 768px) {
    .comment-action-btn {
        padding: 6px 10px;
        min-width: 36px;
        justify-content: center;
        font-size: 14px;
    }
    
    .comment-action-btn .btn-text {
        display: none;
    }
    
    .comment-action-btn i {
        margin: 0;
    }
    
    .comment-footer {
        gap: 6px;
    }
}

@media (min-width: 769px) {
    .comment-footer { 
        gap: 10px; 
    }
    
    .comment-action-btn {
        font-size: 13px;
        padding: 5px 12px;
    }
    
    .comment-action-btn .btn-text {
        display: inline;
    }
}

.replies-container {
    margin-left: 34px;
    margin-top: 6px;
    padding-left: 10px;
    border-left: 2px solid var(--border-color);
}

@media (min-width: 769px) {
    .replies-container {
        margin-left: 50px;
        padding-left: 14px;
    }
}

.reply-item { 
    padding: 8px 0; 
    position: relative;
}

@media (min-width: 769px) {
    .reply-item { padding: 10px 0; }
}

.reply-form {
    display: none;
    margin-top: 10px;
    padding: 12px;
    background: #f9fafb;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.reply-form.show { 
    display: block;
    animation: slideDown 0.2s ease-out;
}

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

.reply-tag {
    background: var(--accent-purple);
    color: white;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 11px;
    display: inline-block;
    margin-bottom: 8px;
}

.comment-edit-form {
    display: none;
    margin-top: 8px;
    padding: 10px;
    background: #f9fafb;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.comment-body.editing + .comment-edit-form { display: block; }
.comment-body.editing { display: none; }

.login-prompt {
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
}

.login-prompt a {
    color: var(--accent-green);
    font-weight: 600;
    text-decoration: none;
}

.login-prompt a:hover {
    text-decoration: underline;
}

.empty-state {
    padding: 3rem;
    text-align: center;
    color: var(--text-secondary);
}

@media (max-width: 480px) {
    .comments-section { border-radius: 12px; }
    .section-header,
    .new-comment-form,
    .comment-item { padding-left: 14px; padding-right: 14px; }
}