:root {
    --bg-dark: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #242424;
    --sidebar-bg: #161616;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --text: #e5e5e5;
    --text-muted: #a1a1a1;
    --text-dim: #737373;
    --border: #2a2a2a;
    --user-msg-bg: #2563eb;
    --bot-msg-bg: #262626;
    --success: #22c55e;
    --danger: #ef4444;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text);
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Login Page */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background: linear-gradient(135deg, #1a1a1a 0%, #0f0f0f 100%);
}

.login-container {
    background: var(--bg-secondary);
    padding: 3rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border);
    max-width: 400px;
}

.login-container h1 {
    margin-bottom: 2rem;
    font-size: 1.75rem;
    font-weight: 600;
}

.login-btn-link {
    display: inline-block;
    padding: 14px 32px;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.2s;
}

.login-btn-link:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* App Layout */
.app-layout {
    display: flex;
    height: 100vh;
    width: 100%;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border);
    flex-shrink: 0;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h3 {
    margin: 0 0 16px 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
}

.new-chat-btn {
    width: 100%;
    padding: 12px 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.new-chat-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.session-list {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
}

.session-list::-webkit-scrollbar {
    width: 6px;
}

.session-list::-webkit-scrollbar-track {
    background: transparent;
}

.session-list::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.session-item {
    padding: 12px 14px;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-muted);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: all 0.15s;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.session-item:hover {
    background: var(--bg-tertiary);
    color: var(--text);
}

.session-item.active {
    background: var(--bg-tertiary);
    color: var(--text);
    font-weight: 500;
    border-left: 3px solid var(--primary);
}

.delete-session-btn {
    opacity: 0;
    color: var(--danger);
    cursor: pointer;
    padding: 4px;
    transition: opacity 0.15s;
}

.session-item:hover .delete-session-btn {
    opacity: 0.7;
}

.delete-session-btn:hover {
    opacity: 1 !important;
}

.user-profile {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
}

#usernameDisplay {
    color: var(--text-muted);
    font-weight: 500;
}

.logout-link {
    color: var(--text-dim);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* Main Chat Area */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--bg-dark);
}

header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-secondary);
    min-height: 64px;
}

.chat-title {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text);
}

.status {
    font-size: 0.85rem;
    padding: 6px 14px;
    border-radius: 12px;
    transition: all 0.3s;
    font-weight: 500;
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.messages::-webkit-scrollbar {
    width: 8px;
}

.messages::-webkit-scrollbar-track {
    background: transparent;
}

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

.message {
    max-width: 75%;
    padding: 14px 18px;
    border-radius: 12px;
    line-height: 1.6;
    word-wrap: break-word;
    word-break: break-word;
    overflow-wrap: break-word;
    animation: fadeIn 0.3s ease;
}

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

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

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

.message.bot,
.message.assistant {
    align-self: flex-start;
    background: var(--bot-msg-bg);
    border: 1px solid var(--border);
    border-bottom-left-radius: 4px;
}

.message.system {
    align-self: center;
    background: transparent;
    color: var(--text-dim);
    font-size: 0.85rem;
    font-style: italic;
    padding: 8px 12px;
}

/* Input Area */
.input-area {
    padding: 20px 24px 24px;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.attachments {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    min-height: 0;
}

.attachment-chip {
    background: var(--bg-tertiary);
    padding: 6px 12px;
    border-radius: 16px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.input-controls {
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

.upload-icon {
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--text-dim);
    padding: 10px;
    transition: all 0.2s;
    border-radius: 8px;
}

.upload-icon:hover {
    color: var(--text);
    background: var(--bg-tertiary);
}

textarea {
    flex: 1;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 12px;
    padding: 14px 16px;
    resize: none;
    font-family: inherit;
    font-size: 0.95rem;
    line-height: 1.5;
    transition: border-color 0.2s;
}

textarea:focus {
    outline: none;
    border-color: var(--primary);
}

textarea::placeholder {
    color: var(--text-dim);
}

button#sendBtn {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 10px;
    padding: 14px 24px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

button#sendBtn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

button#sendBtn:active {
    transform: translateY(0);
}

/* Code Blocks */
.inline-code {
    margin: 16px 0;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-secondary);
    overflow: hidden;
}

.code-header {
    background: var(--bg-tertiary);
    padding: 10px 14px;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: 'Courier New', monospace;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.inline-code pre {
    margin: 0;
    padding: 16px;
    background: transparent;
    overflow-x: auto;
    font-size: 0.9rem;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-tertiary);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--text);
    text-decoration: none;
    border: 1px solid var(--border);
    transition: all 0.2s;
}

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

/* Status Steps */
.status-list {
    margin-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.status-step {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--text-muted);
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border-radius: 8px;
    border-left: 2px solid transparent;
    transition: all 0.2s;
}

.status-step.active {
    color: var(--text);
    background: rgba(59, 130, 246, 0.1);
    border-left-color: var(--primary);
}

.status-step.done {
    color: var(--success);
    opacity: 0.7;
}

.step-icon {
    font-weight: bold;
    min-width: 16px;
    text-align: center;
}

.status-step.active .step-icon {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    100% {
        transform: rotate(360deg);
    }
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--bg-secondary);
    margin: 5% auto;
    padding: 32px;
    border: 1px solid var(--border);
    width: 85%;
    max-width: 900px;
    max-height: 80vh;
    overflow-y: auto;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.close {
    color: var(--text-muted);
    float: right;
    font-size: 32px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
}

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

pre {
    background: var(--bg-tertiary);
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    border: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 240px;
    }

    .message {
        max-width: 85%;
    }
}

/* Add to existing CSS - Status indicator styles */
.status {
    font-size: 0.85rem;
    padding: 6px 14px;
    border-radius: 12px;
    transition: all 0.3s;
    font-weight: 500;
}

.status-ready {
    color: #22c55e;
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid rgba(34, 197, 94, 0.3);
    box-shadow: 0 0 12px rgba(34, 197, 94, 0.4);
    animation: pulse-glow 2s ease-in-out infinite;
}

.status-processing {
    color: #3b82f6;
    background: rgba(59, 130, 246, 0.15);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

@keyframes pulse-glow {

    0%,
    100% {
        box-shadow: 0 0 12px rgba(34, 197, 94, 0.4);
    }

    50% {
        box-shadow: 0 0 20px rgba(34, 197, 94, 0.6);
    }
}

/* Session action buttons */
.session-action-btn {
    opacity: 0;
    cursor: pointer;
    padding: 4px;
    transition: opacity 0.15s;
    font-size: 0.85rem;
}

.session-item:hover .session-action-btn {
    opacity: 0.6;
}

.session-action-btn:hover {
    opacity: 1 !important;
}

.session-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

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