:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #64748b;
    --success: #22c55e;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --bg: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --radius: 8px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    flex: 1;
}

/* Navbar */
.navbar {
    background: var(--bg-secondary);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-brand i {
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 20px;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border-radius: var(--radius);
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--text);
    background: var(--bg);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--secondary);
    color: white;
}

.btn-secondary:hover {
    background: #475569;
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* Alerts */
.alert {
    padding: 15px 20px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid var(--success);
    color: var(--success);
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--danger);
    color: var(--danger);
}

.alert-info {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid var(--info);
    color: var(--info);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

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

.form-group small {
    display: block;
    margin-top: 6px;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
}

/* Auth */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 200px);
}

.auth-card {
    background: var(--bg-card);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 400px;
    border: 1px solid var(--border);
}

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}

.auth-header i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.auth-header h2 {
    font-size: 1.5rem;
}

.auth-footer {
    text-align: center;
    margin-top: 20px;
    color: var(--text-secondary);
}

/* Hero */
.hero {
    text-align: center;
    padding: 80px 20px;
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg));
    border-radius: var(--radius);
    margin-bottom: 40px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Features */
.features {
    padding: 40px 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--bg-card);
    padding: 30px;
    border-radius: var(--radius);
    text-align: center;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 10px;
}

.feature-card p {
    color: var(--text-secondary);
}

/* Dashboard */
.dashboard-header {
    margin-bottom: 30px;
}

.dashboard-header h1 {
    font-size: 2rem;
    margin-bottom: 5px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--bg-card);
    padding: 25px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    gap: 20px;
    border: 1px solid var(--border);
}

.stat-icon {
    font-size: 2.5rem;
    color: var(--primary);
}

.stat-info h3 {
    font-size: 1.5rem;
}

.stat-info p {
    color: var(--text-secondary);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
}

.dashboard-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.card-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h2 {
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-body {
    padding: 20px;
}

.session-list {
    list-style: none;
}

.session-list li a,
.session-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px;
    border-radius: var(--radius);
    transition: var(--transition);
    cursor: pointer;
}

.session-list li a:hover,
.session-item:hover {
    background: var(--bg);
}

.session-title {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    padding: 30px;
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.quick-action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 20px;
    background: var(--bg);
    border-radius: var(--radius);
    color: var(--text);
    transition: var(--transition);
}

.quick-action-btn:hover {
    background: var(--primary);
    color: white;
}

.quick-action-btn i {
    font-size: 1.5rem;
}

/* Chat */
.chat-container {
    display: flex;
    height: calc(100vh - 140px);
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
}

.chat-sidebar {
    width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h3 {
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.chat-sidebar .session-list {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
}

.session-item {
    position: relative;
    margin-bottom: 5px;
}

.session-item.active {
    background: var(--primary);
}

.session-item .delete-session {
    display: none;
    position: absolute;
    right: 10px;
    background: none;
    border: none;
    color: var(--danger);
    cursor: pointer;
    padding: 5px;
}

.session-item:hover .delete-session {
    display: block;
}

.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.chat-header {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h2 {
    font-size: 1.25rem;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

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

.empty-chat i {
    font-size: 4rem;
    margin-bottom: 20px;
    color: var(--primary);
}

.message {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    animation: fadeIn 0.3s ease;
}

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

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

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    flex-shrink: 0;
}

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

.message.assistant .message-avatar {
    background: var(--secondary);
}

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

.message-text {
    padding: 12px 16px;
    border-radius: var(--radius);
    background: var(--bg);
    line-height: 1.5;
}

.message.user .message-text {
    background: var(--primary);
    color: white;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 5px;
}

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

.chat-input-container {
    padding: 15px 20px;
    border-top: 1px solid var(--border);
    position: relative;
}

.emoji-picker {
    position: absolute;
    bottom: 100%;
    left: 20px;
    right: 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px;
    max-height: 300px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.emoji-categories {
    display: flex;
    gap: 5px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 10px;
}

.emoji-category {
    background: none;
    border: none;
    font-size: 1.25rem;
    padding: 5px 10px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.emoji-category:hover,
.emoji-category.active {
    background: var(--primary);
}

.emoji-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(35px, 1fr));
    gap: 5px;
    overflow-y: auto;
    max-height: 200px;
}

.emoji-item {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    padding: 5px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.emoji-item:hover {
    background: var(--bg);
    transform: scale(1.2);
}

.chat-input {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    background: var(--bg);
    border-radius: var(--radius);
    padding: 10px 15px;
}

.input-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 5px;
    transition: var(--transition);
}

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

.chat-input textarea {
    flex: 1;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1rem;
    resize: none;
    max-height: 150px;
    line-height: 1.5;
}

.chat-input textarea:focus {
    outline: none;
}

/* Settings */
.settings-container {
    max-width: 800px;
    margin: 0 auto;
}

.settings-header {
    margin-bottom: 30px;
}

.settings-header h1 {
    font-size: 2rem;
}

.settings-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.tab {
    padding: 10px 20px;
    background: var(--bg-card);
    border-radius: var(--radius);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--border);
}

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

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

.settings-content {
    background: var(--bg-card);
    padding: 30px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.webhook-info {
    margin-top: 30px;
    padding: 20px;
    background: var(--bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.webhook-info h3 {
    margin-bottom: 10px;
}

.webhook-info code {
    display: block;
    margin-top: 10px;
    padding: 10px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    word-break: break-all;
    font-size: 0.875rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .chat-container {
        flex-direction: column;
        height: auto;
    }
    
    .chat-sidebar {
        width: 100%;
        max-height: 200px;
    }
    
    .chat-main {
        height: calc(100vh - 340px);
    }
    
    .message-content {
        max-width: 85%;
    }
}

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

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

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

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