*,:after,:before{box-sizing:border-box;margin:0;padding:0}:root{--color-bg:#f5f6fa;--color-surface:#fff;--color-primary:#2563eb;--color-primary-hover:#1d4ed8;--color-danger:#dc2626;--color-danger-hover:#b91c1c;--color-success:#16a34a;--color-warning:#d97706;--color-text:#1e293b;--color-text-secondary:#64748b;--color-border:#e2e8f0;--color-sidebar:#1e293b;--color-sidebar-text:#cbd5e1;--color-sidebar-hover:#334155;--color-sidebar-active:#2563eb;--radius:8px;--shadow:0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.06);--shadow-md:0 4px 6px rgba(0,0,0,.07),0 2px 4px rgba(0,0,0,.06);--font:-apple-system,BlinkMacSystemFont,"Segoe 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a.active{background:var(--color-sidebar-active);color:#fff}.main-area{flex:1 1;display:flex;flex-direction:column;overflow:hidden}.top-header{justify-content:space-between;padding:12px 24px;background:var(--color-surface);border-bottom:1px solid var(--color-border);min-height:56px}.top-header,.top-header-user{display:flex;align-items:center}.top-header-user{gap:12px;font-size:14px;color:var(--color-text-secondary)}.main-content{flex:1 1;overflow-y:auto;padding:24px}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));grid-gap:16px;gap:16px;margin-bottom:24px}.stat-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.stat-card 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p{color:var(--color-text-secondary);font-size:14px;margin-bottom:24px}.message-list{display:flex;flex-direction:column;gap:12px;max-height:500px;overflow-y:auto;padding:12px}.message-bubble{max-width:70%;padding:10px 14px;border-radius:12px;font-size:14px;line-height:1.5}.message-bubble.customer{align-self:flex-start;background:#f1f5f9;color:var(--color-text)}.message-bubble.bot{align-self:flex-end;background:var(--color-primary);color:#fff}.message-meta{font-size:11px;color:var(--color-text-secondary);margin-top:4px}.alert{padding:10px 14px;border-radius:var(--radius);font-size:14px;margin-bottom:16px}.alert-error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}.alert-success{background:#f0fdf4;color:#166534;border:1px solid #bbf7d0}.loading{display:flex;align-items:center;justify-content:center;padding:40px;color:var(--color-text-secondary);font-size:14px}@media (max-width:768px){.sidebar{width:60px}.sidebar-brand{font-size:0;padding:16px}.sidebar-brand:after{content:"AI";font-size:16px}.sidebar-nav li a span,.sidebar-nav li button span{display:none}.main-content{padding:16px}.stats-grid{grid-template-columns:1fr}}