:root {
    --bg-main: #0f172a;
    --bg-side: #1e293b;
    --accent: #0ea5e9;
    --accent-hover: #0284c7;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: #334155;
    --card-bg: rgba(30, 41, 59, 0.7);
    --glass: rgba(255, 255, 255, 0.03);
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

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

#app {
    display: flex;
    height: 100%;
}

/* Sidebar Styles */
#sidebar {
    width: 280px;
    background-color: var(--bg-side);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1.5rem 1rem;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.95rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.nav-item:hover {
    background: var(--glass);
    color: var(--text-main);
}

.nav-item.active {
    background: var(--accent);
    color: white;
}

.sidebar-divider {
    height: 1px;
    background: var(--border);
    margin: 1.5rem 0;
}

.customer-select {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.customer-select label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.customer-select select {
    background: var(--bg-main);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.5rem;
    border-radius: 0.4rem;
}

#new-session-btn {
    margin-top: 0.5rem;
    background: var(--glass);
    border: 1px dashed var(--border);
    color: var(--text-main);
    padding: 0.5rem;
    border-radius: 0.4rem;
    cursor: pointer;
}

#session-list {
    flex: 1;
    overflow-y: auto;
}

.session-item {
    padding: 0.75rem;
    margin-bottom: 0.25rem;
    border-radius: 0.4rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-muted);
    transition: background 0.2s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.session-item:hover {
    background: var(--glass);
}

.session-item.active {
    background: var(--glass);
    color: var(--accent);
    font-weight: 500;
}

/* Main Content Area */
#main-content {
    flex: 1;
    position: relative;
    background: var(--bg-main);
}

.view {
    display: none;
    height: 100%;
    flex-direction: column;
}

.view.active {
    display: flex;
}

/* Chat View */
#chat-header {
    height: 64px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
}

.header-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dot {
    color: var(--text-muted);
}

.status-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
    border-radius: 1rem;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

#messages {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.message {
    max-width: 85%;
    padding: 1rem 1.25rem;
    border-radius: 1rem;
    line-height: 1.5;
}

.message.user {
    align-self: flex-end;
    background: var(--accent);
    color: white;
}

.message.assistant {
    align-self: flex-start;
    background: var(--bg-side);
    border: 1px solid var(--border);
}

.message pre {
    background: #000;
    padding: 1rem;
    border-radius: 0.5rem;
    margin: 0.75rem 0;
    overflow-x: auto;
}

#input-area {
    padding: 2rem;
}

.input-wrapper {
    background: var(--bg-side);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 0.75rem;
    display: flex;
    gap: 0.75rem;
    box-shadow: var(--shadow);
}

#message-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-main);
    resize: none;
    font-size: 1rem;
    outline: none;
    max-height: 200px;
}

#send-btn {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

#send-btn:hover {
    background: var(--accent-hover);
}

/* Workbench Styles */
.workbench-header {
    padding: 2.5rem 2.5rem 1.5rem;
}

.workbench-header h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.workbench-header p {
    color: var(--text-muted);
}

.workbench-grid {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    padding: 0 2.5rem 2.5rem;
    overflow-y: auto;
}

.workbench-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 1rem;
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(10px);
}

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h2 {
    font-size: 1.1rem;
}

.card-body {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
}

/* Tables */
.table-container {
    width: 100%;
}

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

th {
    text-align: left;
    padding: 0.75rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

td {
    padding: 1rem 0.75rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.95rem;
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
}

.btn-icon:hover {
    color: #ef4444;
}

/* Correction List */
.correction-item {
    padding: 1.25rem;
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    margin-bottom: 1rem;
    background: var(--glass);
}

.corr-q {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--accent);
}

.corr-a {
    font-size: 0.9rem;
    color: var(--text-muted);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.corr-footer {
    margin-top: 1rem;
    display: flex;
    justify-content: flex-end;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--bg-side);
    border: 1px solid var(--border);
    border-radius: 1rem;
    width: 500px;
    padding: 2rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.modal h3 {
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.form-group input, .form-group textarea {
    width: 100%;
    background: var(--bg-main);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.75rem;
    border-radius: 0.5rem;
    outline: none;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 2rem;
}

.btn-primary {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.6rem 1.25rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 500;
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.6rem 1.25rem;
    border-radius: 0.5rem;
    cursor: pointer;
}

/* Markdown Rendering Styles */
.markdown-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    font-size: 0.85rem;
}

.markdown-table th {
    background: rgba(255,255,255,0.05);
    padding: 0.5rem;
}

.markdown-table td {
    padding: 0.5rem;
    border: 1px solid var(--border);
}

.loading-dots::after {
    content: '...';
    display: inline-block;
    width: 20px;
    text-align: left;
    animation: dots 1.5s infinite;
}

@keyframes dots {
    0% { content: '.'; }
    33% { content: '..'; }
    66% { content: '...'; }
}