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

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border: #e5e7eb;
    --shadow: rgba(0, 0, 0, 0.1);
    --blue: #3b82f6;
    --green: #10b981;
    --red: #ef4444;
    --purple: #8b5cf6;
    --accent: #f3f4f6;
}

[data-theme="dark"] {
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-card: #1f2937;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --border: #374151;
    --shadow: rgba(0, 0, 0, 0.3);
    --accent: #374151;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: background-color 0.3s, color 0.3s;
}

/* Navigation */
.navbar {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    box-shadow: 0 1px 3px var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-title {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-link:hover,
.nav-link.active {
    color: var(--blue);
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    padding: 0.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.3s;
}

.theme-toggle:hover {
    background-color: var(--accent);
}

/* Main Content */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--text-secondary);
}

/* Loading and Error States */
.loading,
.error {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

.loading-text,
.error-text {
    color: var(--text-secondary);
}

.error-text {
    color: var(--red);
}

.hidden {
    display: none !important;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background-color: var(--bg-card);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px var(--shadow);
    transition: box-shadow 0.3s;
}

.stat-card:hover {
    box-shadow: 0 4px 6px var(--shadow);
}

.stat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.stat-title {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-icon {
    width: 1rem;
    height: 1rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-primary);
}

.text-blue { color: var(--blue); }
.text-green { color: var(--green); }
.text-red { color: var(--red); }
.text-purple { color: var(--purple); }

/* Tables */
.tables-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 1.5rem;
}

.table-card {
    background-color: var(--bg-card);
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px var(--shadow);
    overflow: hidden;
    transition: box-shadow 0.3s;
}

.table-card:hover {
    box-shadow: 0 4px 6px var(--shadow);
}

.table-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem;
    font-weight: 600;
    border-bottom: 1px solid var(--border);
}

.count-badge {
    margin-left: auto;
    background-color: var(--accent);
    padding: 0.25rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.875rem;
}

.table-container {
    overflow-x: auto;
}

.leads-table {
    width: 100%;
    border-collapse: collapse;
}

.leads-table th {
    text-align: left;
    padding: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

.leads-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

.leads-table tr:hover {
    background-color: var(--accent);
}

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

/* Chat Layout */
.chat-layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 0;
    height: 600px;
    background-color: var(--bg-card);
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: 0 1px 3px var(--shadow);
}

.chat-sidebar {
    border-right: 1px solid var(--border);
    background-color: var(--bg-card);
}

.search-container {
    position: relative;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

.search-input {
    width: 100%;
    padding: 0.5rem 2.5rem 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.search-icon {
    position: absolute;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    width: 1rem;
    height: 1rem;
    color: var(--text-secondary);
}

.chat-list {
    overflow-y: auto;
    height: calc(100% - 80px);
}

.chat-item {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background-color 0.3s;
}

.chat-item:hover,
.chat-item.active {
    background-color: var(--accent);
}

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

.chat-item-name {
    font-weight: 600;
    color: var(--text-primary);
}

.chat-item-time {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.chat-item-message {
    font-size: 0.875rem;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chat-main {
    background-color: var(--bg-secondary);
    position: relative;
}

.chat-welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: var(--text-secondary);
}

.welcome-icon {
    width: 3rem;
    height: 3rem;
    margin-bottom: 1rem;
}

.chat-messages {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.chat-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    background-color: var(--bg-card);
}

.chat-user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-avatar {
    width: 2.5rem;
    height: 2.5rem;
    background-color: var(--blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.user-details h3 {
    font-size: 1rem;
    font-weight: 600;
}

.user-details p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.message {
    margin-bottom: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.75rem;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background-color: var(--blue);
}

.message.ai .message-avatar {
    background-color: var(--green);
}

.message-content {
    max-width: 70%;
}

.message.user .message-content {
    text-align: right;
}

.message-bubble {
    padding: 0.75rem 1rem;
    border-radius: 1rem;
    word-wrap: break-word;
}

.message.user .message-bubble {
    background-color: var(--blue);
    color: white;
    border-bottom-right-radius: 0.25rem;
}

.message.ai .message-bubble {
    background-color: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-bottom-left-radius: 0.25rem;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        padding: 0 1rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .main-content {
        padding: 1rem;
    }

    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1rem;
    }

    .tables-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .chat-layout {
        grid-template-columns: 1fr;
        height: 500px;
    }

    .chat-sidebar {
        display: none;
    }
}