:root {
    --bg-dark: #0f172a;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --primary: #06b6d4;
    --primary-glow: rgba(6, 182, 212, 0.3);
    --secondary: #8b5cf6;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --ai-bubble: rgba(30, 41, 59, 0.7);
    --user-bubble: linear-gradient(135deg, #06b6d4, #3b82f6);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-dark);
    /* Mesh Gradient cực kỳ Premium bằng CSS thuần */
    background-image: 
        radial-gradient(at 0% 0%, rgba(6, 182, 212, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(139, 92, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(6, 182, 212, 0.1) 0px, transparent 50%),
        radial-gradient(at 0% 100%, rgba(139, 92, 246, 0.1) 0px, transparent 50%);
    background-size: cover;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-main);
    overflow: hidden;
}

.app-container {
    width: 95vw;
    height: 90vh;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    display: flex;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    position: relative;
}

/* Sidebar Styling */
.sidebar {
    width: 260px;
    background: rgba(15, 23, 42, 0.4);
    border-right: 1px solid var(--glass-border);
    padding: 30px 20px;
    display: flex;
    flex-direction: column;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 50px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--user-bubble);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 20px;
    box-shadow: 0 0 20px var(--primary-glow);
}

.logo-area h1 {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.side-nav {
    flex: 1;
}

.nav-item {
    padding: 14px 18px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 15px;
    cursor: pointer;
    transition: 0.3s;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.nav-item:hover, .nav-item.active {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-main);
}

.nav-item.active {
    border-left: 4px solid var(--primary);
}

.system-status {
    padding-top: 20px;
    border-top: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: var(--text-muted);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-dot.online {
    background: #10b981;
    box-shadow: 0 0 10px #10b981;
}

/* Main Chat Area */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}

.chat-header {
    padding: 25px 40px;
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-info h2 {
    font-size: 18px;
}

.header-info p {
    font-size: 13px;
    color: var(--text-muted);
}

.header-actions button {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 18px;
    cursor: pointer;
    transition: 0.3s;
}

.header-actions button:hover {
    color: #ef4444;
}

.messages-container {
    flex: 1;
    padding: 40px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 25px;
    scrollbar-width: thin;
    scrollbar-color: var(--glass-border) transparent;
}

.messages-container::-webkit-scrollbar {
    width: 6px;
}

.messages-container::-webkit-scrollbar-thumb {
    background-color: var(--glass-border);
    border-radius: 10px;
}

.message {
    display: flex;
    gap: 18px;
    max-width: 85%;
    animation: fadeIn 0.4s ease-out;
}

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

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

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}

.ai .avatar { background: rgba(255, 255, 255, 0.1); color: var(--primary); border: 1px solid var(--glass-border); }
.user .avatar { background: var(--user-bubble); color: white; }

.content {
    background: var(--ai-bubble);
    padding: 16px 20px;
    border-radius: 18px;
    border-bottom-left-radius: 4px;
    line-height: 1.6;
    font-size: 15px;
    border: 1px solid var(--glass-border);
}

.user .content {
    background: var(--user-bubble);
    border-bottom-left-radius: 18px;
    border-bottom-right-radius: 4px;
    border: none;
}

.citation-tag {
    display: inline-block;
    margin-top: 10px;
    padding: 4px 10px;
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: 8px;
    font-size: 12px;
    color: var(--primary);
    cursor: pointer;
    transition: 0.3s;
}

.citation-tag:hover {
    background: rgba(6, 182, 212, 0.2);
}

/* Footer Input Area */
.chat-footer {
    padding: 30px 40px;
}

.input-wrapper {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 10px 15px;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: 0.3s;
}

.input-wrapper:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 15px var(--primary-glow);
}

textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-main);
    resize: none;
    outline: none;
    padding: 10px 5px;
    max-height: 150px;
}

#send-btn {
    width: 45px;
    height: 45px;
    background: var(--user-bubble);
    border: none;
    border-radius: 12px;
    color: white;
    cursor: pointer;
    transition: 0.3s;
}

#send-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px var(--primary-glow);
}

.disclaimer {
    text-align: center;
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 12px;
}

/* Source Panel */
.source-panel {
    position: absolute;
    right: -350px;
    top: 0;
    width: 350px;
    height: 100%;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(25px);
    border-left: 1px solid var(--glass-border);
    transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 10;
    padding: 30px;
}

.source-panel.active {
    right: 0;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.source-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 15px;
}

.source-item h4 { font-size: 14px; margin-bottom: 5px; color: var(--primary); }
.source-item p { font-size: 12px; color: var(--text-muted); line-height: 1.4; }

/* History Panel */
.history-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: 0.3s;
}

.history-item:hover {
    background: rgba(255, 255, 255, 0.08);
}

.history-item .history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.history-item .history-time {
    font-size: 12px;
    color: var(--text-muted);
}

.history-item .history-status {
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 6px;
    font-weight: 600;
}

.history-item .history-status.completed {
    background: rgba(16, 185, 129, 0.2);
    color: #10b981;
}

.history-item .history-status.failed {
    background: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

.history-item .history-status.running {
    background: rgba(139, 92, 246, 0.2);
    color: #8b5cf6;
}

.history-item .history-summary {
    display: flex;
    gap: 12px;
    font-size: 12px;
    color: var(--text-muted);
}

.history-item .history-summary span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.history-files {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--glass-border);
    display: none;
}

.history-item.expanded .history-files {
    display: block;
}

.history-file {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    font-size: 12px;
    border-bottom: 1px solid rgba(255,255,255,0.03);
}

.history-file:last-child {
    border-bottom: none;
}

.history-file-name {
    color: var(--text-main);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-file-status {
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: 8px;
}

.history-file-status.indexed {
    background: rgba(16, 185, 129, 0.2);
    color: #10b981;
}

.history-file-status.skipped {
    background: rgba(234, 179, 8, 0.2);
    color: #eab308;
}

.history-file-status.error {
    background: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

/* Login Screen */
.login-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}

.login-card {
    background: var(--glass-bg);
    backdrop-filter: blur(30px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 50px 40px;
    width: 400px;
    text-align: center;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.login-logo {
    margin-bottom: 40px;
}

.login-logo .logo-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    font-size: 28px;
}

.login-logo h1 {
    font-size: 24px;
    margin-bottom: 8px;
}

.login-logo p {
    color: var(--text-muted);
    font-size: 14px;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 14px 18px;
    margin-bottom: 20px;
    transition: 0.3s;
}

.input-group:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 15px var(--primary-glow);
}

.input-group i {
    color: var(--text-muted);
    font-size: 16px;
}

.input-group input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-main);
    font-size: 15px;
}

.login-btn {
    width: 100%;
    padding: 14px;
    background: var(--user-bubble);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s;
}

.login-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 0 20px var(--primary-glow);
}

.login-hint {
    margin-top: 20px;
    font-size: 12px;
    color: var(--text-muted);
}

.login-divider {
    display: flex;
    align-items: center;
    gap: 15px;
    margin: 20px 0;
    color: var(--text-muted);
    font-size: 13px;
}

.login-divider::before,
.login-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--glass-border);
}

.sso-btn {
    width: 100%;
    padding: 14px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: var(--text-main);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.sso-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--primary);
}

/* User Info */
.user-info {
    padding-top: 20px;
    border-top: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: var(--text-muted);
}

.user-avatar {
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.user-details {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.user-name {
    color: var(--text-main);
    font-weight: 600;
    font-size: 13px;
}

.user-role {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

#logout-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: 0.3s;
}

#logout-btn:hover {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

/* Sync Button */
.sync-btn {
    width: 100%;
    padding: 12px 18px;
    margin-top: 10px;
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: 12px;
    color: var(--primary);
    font-size: 13px;
    cursor: pointer;
    transition: 0.3s;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sync-btn:hover {
    background: rgba(6, 182, 212, 0.2);
}

.sync-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Sync Status */
.sync-status {
    padding: 12px;
    margin-top: 10px;
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 12px;
    color: var(--secondary);
}

.sync-status.done {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.2);
    color: #10b981;
}

.sync-status.error {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}