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

:root {
    --primary-color: #1da1f2;
    --secondary-color: #14171a;
    --background: #ffffff;
    --surface: #f7f9fa;
    --border: #e1e8ed;
    --text-primary: #14171a;
    --text-secondary: #657786;
    --success: #17bf63;
    --danger: #e0245e;
    --warning: #ffad1f;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--surface);
    color: var(--text-primary);
    line-height: 1.5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: var(--background);
    padding: 30px;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 20px;
}

header h1 {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.tagline {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.header-actions {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.last-search {
    color: var(--text-secondary);
    font-size: 14px;
    margin-left: auto;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 20px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    text-align: center;
    vertical-align: middle;
    line-height: 1.5;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    border: 1px solid transparent;
}

.btn-primary:hover {
    background: #1a91da;
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
}

.btn-small {
    padding: 6px 12px;
    font-size: 13px;
}

.filters {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    background: var(--background);
    padding: 15px;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.advanced-search {
    background: var(--background);
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.advanced-search-panel {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border);
}

.search-options {
    display: grid;
    gap: 15px;
}

.search-option {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.search-option label {
    font-weight: 600;
    min-width: 150px;
    color: var(--text-primary);
}

.search-option input[type="text"] {
    flex: 1;
    min-width: 200px;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
}

.search-option input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

.active-filters {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.filter-label {
    font-weight: 600;
    color: var(--text-secondary);
}

.active-filter-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 5px 12px;
    background: rgba(29, 161, 242, 0.1);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
}

.active-filter-tag .remove-filter {
    cursor: pointer;
    font-size: 16px;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.active-filter-tag .remove-filter:hover {
    opacity: 1;
}

#activeFiltersList {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 16px;
    background: none;
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.filter-btn:hover {
    background: var(--surface);
}

.filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.filter-count {
    display: inline-block;
    margin-left: 6px;
    padding: 2px 8px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.filter-btn.active .filter-count {
    background: rgba(255, 255, 255, 0.3);
}

.bulk-actions {
    background: #f8f9fa;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 20px;
    margin-bottom: 20px;
}

.bulk-actions-content {
    display: flex;
    align-items: center;
    gap: 20px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-weight: 600;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.conversation-card .card-checkbox {
    position: absolute;
    top: 20px;
    right: 20px;
}

.conversation-card .card-checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.conversation-card.selected {
    border: 2px solid var(--primary-color);
    background: rgba(29, 161, 242, 0.05);
}

.btn-danger {
    background: #dc3545;
    color: white;
    border-color: #dc3545;
}

.btn-danger:hover {
    background: #c82333;
    border-color: #bd2130;
}

.conversation-card {
    background: var(--background);
    border-radius: 12px;
    padding: 20px;
    position: relative;
    margin-bottom: 15px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: box-shadow 0.2s;
}

.conversation-card:hover {
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.conversation-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 15px;
}

.author-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.author-name {
    font-weight: 700;
    color: var(--text-primary);
}

.author-username {
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.2s;
}

.author-username:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.tweet-time {
    color: var(--text-secondary);
    font-size: 14px;
    margin-left: 8px;
}

.tweet-time::before {
    content: '·';
    margin-right: 8px;
}

.engagement-stats {
    display: flex;
    gap: 15px;
    font-size: 14px;
    color: var(--text-secondary);
}

.stat {
    display: flex;
    align-items: center;
    gap: 5px;
}

.tweet-text {
    font-size: 16px;
    margin-bottom: 15px;
    line-height: 1.6;
}

.keyword-badge {
    display: inline-block;
    background: var(--surface);
    color: var(--primary-color);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 15px;
}

.suggested-response {
    background: var(--surface);
    border-left: 3px solid var(--primary-color);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 15px;
}

.suggested-response-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: 8px;
}

.response-text {
    font-size: 15px;
    color: var(--text-primary);
}

.response-actions {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.conversation-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state h2 {
    font-size: 24px;
    margin-bottom: 10px;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
}

.pagination button {
    padding: 8px 16px;
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination button.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--background);
    padding: 30px;
    border-radius: 12px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.close {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 28px;
    font-weight: bold;
    color: var(--text-secondary);
    cursor: pointer;
}

.close:hover {
    color: var(--text-primary);
}

.modal-content h2 {
    margin-bottom: 20px;
}

.add-keyword {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.add-keyword input {
    flex: 1;
    padding: 10px 15px;
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 15px;
}

.search-tips {
    background: var(--surface);
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    overflow: hidden;
}

.search-tips-toggle {
    width: 100%;
    padding: 12px 15px;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.search-tips-toggle:hover {
    background: rgba(0, 0, 0, 0.02);
}

.toggle-icon {
    transition: transform 0.2s;
    font-size: 10px;
    color: var(--text-secondary);
}

.search-tips.open .toggle-icon {
    transform: rotate(90deg);
}

.search-tips strong {
    color: var(--text-primary);
    font-weight: 600;
}

.search-tips-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.search-tips.open .search-tips-content {
    max-height: 300px;
}

.search-tips ul {
    margin: 0;
    padding: 0 15px 15px 35px;
}

.search-tips li {
    margin-bottom: 4px;
    color: var(--text-secondary);
}

.search-tips code {
    background: var(--background);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: monospace;
    font-size: 13px;
    color: var(--primary-color);
}

.keyword-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.keyword-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 15px;
    background: var(--surface);
    border-radius: 8px;
}

.keyword-item.inactive {
    opacity: 0.5;
}

.keyword-name {
    font-weight: 600;
}

.keyword-actions {
    display: flex;
    gap: 8px;
}

.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    color: var(--text-secondary);
    font-size: 14px;
}

.icon-btn:hover {
    color: var(--text-primary);
}

.suggested-keywords {
    background: #f8f9fa;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 15px;
    text-align: left;
}

.suggested-keywords h4 {
    margin: 0 0 10px 0;
    font-size: 14px;
    color: var(--text-secondary);
}

.suggested-keyword-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-bottom: 8px;
}

.suggested-keyword-item:last-child {
    margin-bottom: 0;
}

.suggested-keyword-text {
    font-size: 14px;
    color: var(--text-primary);
}

.suggested-keyword-add {
    padding: 5px 12px;
    font-size: 13px;
    border: 1px solid var(--primary-color);
    background: white;
    color: var(--primary-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.suggested-keyword-add:hover {
    background: var(--primary-color);
    color: white;
}

.suggested-keyword-add:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.status-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.status-badge.responded {
    background: #e8f5e9;
    color: var(--success);
}

.status-badge.dismissed {
    background: #fce4ec;
    color: var(--danger);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header {
        padding: 20px;
    }
    
    .header-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .last-search {
        margin-left: 0;
        text-align: center;
    }
    
    .filters {
        flex-wrap: wrap;
    }
    
    .conversation-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .engagement-stats {
        margin-top: 10px;
    }
}