:root{--bg-dark: #0f172a;--bg-card: #1e293b;--bg-hover: #334155;--accent: #06b6d4;--accent-hover: #0891b2;--text-main: #f8fafc;--text-muted: #94a3b8;--border: #334155;--person-a: #ec4899;--person-b: #3b82f6;--font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-dark);color:var(--text-main);font-family:var(--font-family)}button,input,textarea,select{font:inherit}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--bg-dark)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}.app-container{display:flex;flex-direction:column;height:100vh;width:100vw;overflow:hidden}@media (min-width: 768px){.app-container{flex-direction:row}}.sidebar{background:var(--bg-card);border-right:1px solid var(--border);width:100%;height:60px;display:flex;align-items:center;justify-content:space-between;padding:0 1rem;flex-shrink:0}@media (min-width: 768px){.sidebar{width:240px;height:100%;flex-direction:column;justify-content:flex-start;padding:1.5rem 1rem;gap:2rem}}.brand{font-weight:700;font-size:1.25rem;color:var(--accent);display:flex;align-items:center;gap:.5rem}.nav-menu{display:flex;gap:.5rem}@media (min-width: 768px){.nav-menu{flex-direction:column;width:100%}}.nav-item{display:flex;align-items:center;gap:.75rem;padding:.6rem 1rem;border-radius:8px;color:var(--text-muted);background:transparent;border:none;cursor:pointer;text-decoration:none;font-size:.95rem;width:100%;text-align:left}.nav-item:hover,.nav-item.active{background:var(--bg-hover);color:var(--text-main)}.nav-item.active{border-left:3px solid var(--accent)}.main-content{flex:1;height:calc(100vh - 60px);overflow-y:auto;background:var(--bg-dark);padding:1.25rem}@media (min-width: 768px){.main-content{height:100vh;padding:2rem}}.user-badge{display:flex;align-items:center;gap:.5rem;font-size:.85rem;padding:.4rem .8rem;border-radius:20px;background:#ffffff0d}.avatar{width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.75rem}.avatar.person-a{background:var(--person-a);color:#fff}.avatar.person-b{background:var(--person-b);color:#fff}.btn{background:var(--accent);color:#fff;border:none;padding:.6rem 1.2rem;border-radius:6px;cursor:pointer;font-weight:600;display:inline-flex;align-items:center;gap:.5rem;transition:background .2s}.btn:hover{background:var(--accent-hover)}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:8px;padding:1rem}.input-field{width:100%;background:#0003;border:1px solid var(--border);padding:.75rem;border-radius:6px;color:var(--text-main);outline:none}.input-field:focus{border-color:var(--accent)}