:root{--bg: #f5f6f8;--panel: #ffffff;--border: #dcdfe4;--text: #1f2430;--muted: #6b7280;--accent: #2563eb;--accent-soft: #eaf0ff;--danger: #b91c1c;--danger-soft: #fef2f2;--ok: #15803d;--warn: #b45309;--warn-soft: #fffbeb;--radius: 8px;--font: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif}*{box-sizing:border-box}html,body,#app{height:100%;margin:0}body{font-family:var(--font);font-size:14px;color:var(--text);background:var(--bg)}.app-shell{display:flex;flex-direction:column;height:100%;min-height:0}.plain-main,.admin-main{flex:1;min-height:0}.admin-main{padding:20px;overflow-y:auto}.admin-header{display:flex;align-items:center;gap:16px;padding:10px 20px;background:var(--panel);border-bottom:1px solid var(--border);flex-wrap:wrap}.admin-header .brand{font-weight:600}.admin-header nav{display:flex;gap:4px;flex-wrap:wrap}.admin-header nav a,.header-right a{padding:6px 10px;border-radius:var(--radius);color:var(--text);text-decoration:none}.admin-header nav 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var(--border);border-radius:var(--radius);padding:24px}.page{max-width:900px;margin:0 auto;padding:20px;overflow-y:auto;height:100%}.page-header{display:flex;align-items:center;gap:12px;margin-bottom:16px}.page-header h1{margin:0}.page-header .spacer{flex:1}@media (max-width: 720px){.chat-sidebar{position:absolute;z-index:20;height:100%;box-shadow:0 0 20px #00000026}}