:root {
    --bg-main: #090d16; --bg-sidebar: #06090f; --bg-panel: #111827; --bg-hover: #1e293b;
    --accent-blue: #2563eb; --accent-cyan: #06b6d4; --text-main: #f8fafc; --text-muted: #94a3b8; --border: #1e293b;
}
* { box-sizing: border-box; }
body { margin: 0; padding: 0; background: var(--bg-main); color: var(--text-main); font-family: system-ui, -apple-system, sans-serif; display: flex; height: 100vh; overflow: hidden; }
.accent { color: var(--accent-cyan); }
.sidebar { width: 280px; background: var(--bg-sidebar); border-right: 1px solid var(--border); display: flex; flex-direction: column; flex-shrink: 0; }
.sidebar-header { padding: 18px 16px 12px; }
.brand-logo { display: flex; align-items: center; gap: 8px; font-size: 20px; font-weight: 800; color: #fff; text-decoration: none; margin-bottom: 14px; }
.logo-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--accent-cyan); box-shadow: 0 0 10px var(--accent-cyan); }
.btn-primary-full { width: 100%; background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan)); color: #fff; border: none; padding: 11px 14px; border-radius: 9px; font-weight: 600; cursor: pointer; }
.sidebar-search { padding: 0 16px 10px; }
.sidebar-search input { width: 100%; background: var(--bg-panel); border: 1px solid var(--border); color: #fff; padding: 9px 12px; border-radius: 8px; }
.sidebar-tabs { display: flex; padding: 0 16px 8px; gap: 6px; }
.tab-btn { flex: 1; background: var(--bg-panel); border: 1px solid var(--border); color: var(--text-muted); padding: 6px; font-size: 12px; border-radius: 6px; cursor: pointer; }
.tab-btn.active { color: #fff; border-color: var(--accent-cyan); }
.conversations-list { flex: 1; overflow-y: auto; padding: 6px 12px; display: flex; flex-direction: column; gap: 4px; }
.conv-item { display: flex; align-items: center; justify-content: space-between; padding: 9px 10px; border-radius: 8px; cursor: pointer; color: var(--text-muted); font-size: 13.5px; }
.conv-item:hover, .conv-item.active { background: var(--bg-hover); color: #fff; }
.conv-title { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; flex: 1; }
.conv-actions { display: none; gap: 4px; }
.conv-item:hover .conv-actions { display: flex; }
.conv-action-btn { background: transparent; border: none; color: var(--text-muted); cursor: pointer; font-size: 12px; }
.sidebar-footer { padding: 14px 16px; border-top: 1px solid var(--border); }
.user-card { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.user-avatar { width: 34px; height: 34px; border-radius: 8px; background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan)); display: flex; align-items: center; justify-content: center; font-weight: 700; }
.footer-links { display: flex; justify-content: space-between; font-size: 12.5px; }
.footer-link { color: var(--text-muted); text-decoration: none; }
.main-area { flex: 1; display: flex; flex-direction: column; background: var(--bg-main); }
.top-bar { height: 58px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; padding: 0 22px; }
.btn-subtle { background: var(--bg-panel); border: 1px solid var(--border); color: #fff; padding: 7px 12px; border-radius: 7px; text-decoration: none; font-size: 13px; cursor: pointer; }
.chat-scroll-area { flex: 1; overflow-y: auto; padding: 28px 20px; }
.welcome-screen { max-width: 720px; margin: 40px auto; text-align: center; }
.welcome-badge { display: inline-block; padding: 4px 12px; border-radius: 999px; font-size: 11px; font-weight: 700; background: rgba(6, 182, 212, 0.12); color: var(--accent-cyan); margin-bottom: 12px; }
.suggestions-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 12px; margin-top: 28px; text-align: left; }
.suggestion-card { background: var(--bg-panel); border: 1px solid var(--border); border-radius: 10px; padding: 14px; color: #fff; cursor: pointer; display: flex; flex-direction: column; gap: 4px; }
.suggestion-card:hover { border-color: var(--accent-cyan); }
.s-title { font-weight: 600; font-size: 14px; }
.s-desc { font-size: 12px; color: var(--text-muted); }
.message-row { max-width: 820px; margin: 0 auto 20px; display: flex; flex-direction: column; }
.message-row.user { align-items: flex-end; }
.message-row.assistant { align-items: flex-start; }
.message-bubble { max-width: 100%; padding: 14px 18px; border-radius: 12px; line-height: 1.65; font-size: 14.5px; }
.message-row.user .message-bubble { background: var(--bg-panel); border: 1px solid var(--border); }
.message-row.assistant .message-bubble { background: transparent; padding-left: 0; width: 100%; }
.message-meta { display: flex; gap: 10px; margin-top: 6px; font-size: 12px; color: var(--text-muted); }
.meta-btn { background: none; border: none; color: var(--text-muted); cursor: pointer; font-size: 12px; }
pre { background: #0d1117 !important; border: 1px solid var(--border); border-radius: 8px; padding: 14px; overflow-x: auto; position: relative; }
.code-copy-btn { position: absolute; top: 8px; right: 8px; background: var(--bg-panel); border: 1px solid var(--border); color: var(--text-muted); font-size: 11px; padding: 4px 8px; border-radius: 5px; cursor: pointer; }
.input-dock { padding: 14px 20px 18px; max-width: 860px; width: 100%; margin: 0 auto; }
.generation-controls { display: flex; justify-content: center; margin-bottom: 10px; }
.btn-stop { background: #1f2937; border: 1px solid #ef4444; color: #fca5a5; padding: 6px 14px; border-radius: 999px; cursor: pointer; }
.chat-input-wrapper { display: flex; align-items: flex-end; gap: 10px; background: var(--bg-panel); border: 1px solid var(--border); border-radius: 12px; padding: 10px 12px; }
#message-input { flex: 1; background: transparent; border: none; color: #fff; font-family: inherit; font-size: 14.5px; resize: none; max-height: 200px; }
#message-input:focus { outline: none; }
.btn-send { background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan)); color: #fff; border: none; width: 38px; height: 38px; border-radius: 9px; cursor: pointer; }
.admin-body { overflow-y: auto; display: block; }
.admin-container { max-width: 1240px; margin: 0 auto; padding: 32px 24px; }
.admin-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 14px; margin-bottom: 26px; }
.stat-card { background: var(--bg-panel); border: 1px solid var(--border); padding: 16px; border-radius: 10px; display: flex; flex-direction: column; }
.stat-label { font-size: 12px; color: var(--text-muted); }
.stat-val { font-size: 24px; font-weight: 700; }
.admin-grid-2col { display: grid; grid-template-columns: repeat(auto-fit, minmax(440px, 1fr)); gap: 22px; }
.admin-panel { background: var(--bg-panel); border: 1px solid var(--border); padding: 22px; border-radius: 12px; }
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 13px; color: var(--text-muted); margin-bottom: 5px; }
.form-control { width: 100%; background: var(--bg-main); border: 1px solid var(--border); color: #fff; padding: 9px 12px; border-radius: 8px; }
.form-row { display: flex; gap: 12px; }
.form-row .form-group { flex: 1; }
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 20px; }
.alert-success { background: rgba(16, 185, 129, 0.15); border: 1px solid #10b981; color: #a7f3d0; }
.alert-error { background: rgba(239, 68, 68, 0.15); border: 1px solid #ef4444; color: #fecaca; }
.mobile-only { display: none; }
.icon-btn { background: transparent; border: none; color: #fff; cursor: pointer; font-size: 18px; }
@media (max-width: 768px) {
    .sidebar { position: fixed; height: 100vh; transform: translateX(-100%); z-index: 999; }
    .sidebar.open { transform: translateX(0); }
    .mobile-only { display: block; }
}