:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --human-bubble: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    --ai-bubble: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --border-color: #e2e8f0;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
}

/* Layout */
.dashboard {
    display: grid;
    grid-template-columns: 320px 1fr;
    grid-template-rows: auto auto 1fr;
    min-height: 100vh;
}

/* Header */
.header {
    grid-column: 1 / -1;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stats-bar {
    display: flex;
    gap: 2rem;
}

.stat-item {
    text-align: center;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border-radius: 12px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-primary);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Charts Section */
.charts-section {
    grid-column: 1 / -1;
    padding: 1.5rem 2rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.chart-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
}

.chart-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.chart-container {
    height: 180px;
    position: relative;
}

/* Sidebar */
.sidebar {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.search-box {
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all 0.3s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.search-box::before {
    content: '🔍';
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.875rem;
}

.filters {
    padding: 1rem;
    display: flex;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.filter-btn {
    flex: 1;
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn:hover {
    background: var(--bg-primary);
    border-color: var(--accent-primary);
}

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

/* Date filters */
.date-filters {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.date-filters label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.date-filters input[type="date"] {
    width: 100%;
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.8rem;
}

.date-filters input[type="date"]:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.date-row {
    display: flex;
    gap: 0.5rem;
}

.date-row>div {
    flex: 1;
}

.clear-dates-btn {
    padding: 0.5rem;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.clear-dates-btn:hover {
    background: #fee2e2;
    border-color: #ef4444;
    color: #ef4444;
}

.sessions-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.session-item {
    padding: 1rem;
    margin-bottom: 0.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.session-item:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    transform: translateX(4px);
}

.session-item.active {
    background: var(--accent-gradient);
    border-color: transparent;
    color: white;
}

.session-item.active .session-stats {
    color: rgba(255, 255, 255, 0.8);
}

.session-phone {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.session-phone::before {
    content: '📱';
}

.session-stats {
    display: flex;
    gap: 1rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.session-stats span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.session-date {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-primary);
}

.content-header {
    padding: 1rem 2rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.content-title {
    font-size: 1.1rem;
    font-weight: 600;
}

.content-filters {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.content-filters input {
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.875rem;
    width: 300px;
}

.content-filters input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* Chat Container */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    max-width: 70%;
    padding: 1rem 1.25rem;
    border-radius: 16px;
    position: relative;
    animation: fadeIn 0.3s ease;
    box-shadow: var(--shadow-sm);
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.human {
    align-self: flex-end;
    background: var(--human-bubble);
    border-bottom-right-radius: 4px;
    color: white;
}

.message.ai {
    align-self: flex-start;
    background: var(--ai-bubble);
    border-bottom-left-radius: 4px;
    color: white;
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.25rem;
}

.message-type {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.8;
}

.message-time {
    font-size: 0.65rem;
    opacity: 0.7;
}

.message-content {
    font-size: 0.9rem;
    line-height: 1.5;
    word-wrap: break-word;
}

.message-id {
    font-size: 0.65rem;
    opacity: 0.5;
    margin-top: 0.5rem;
    text-align: right;
}

/* Empty State */
.empty-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    gap: 1rem;
}

.empty-state-icon {
    font-size: 4rem;
    opacity: 0.5;
}

.empty-state-text {
    font-size: 1.1rem;
}

/* Pagination */
.pagination {
    padding: 1rem 2rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
}

.pagination button {
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.pagination button:hover:not(:disabled) {
    background: var(--accent-gradient);
    border-color: transparent;
    color: white;
}

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

.pagination-info {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Loading */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

/* Responsive */
@media (max-width: 1200px) {
    .charts-section {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .dashboard {
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
    }

    .stats-bar {
        display: none;
    }

    .charts-section {
        grid-template-columns: 1fr;
    }
}