:root{--sidebar-width: 240px;--sidebar-bg: #0f1117;--sidebar-border: #1e2330;--topbar-height: 0px;--bottomnav-height: 64px;--accent: #00bcd4;--accent-gold: #ffd700;--danger: #ef4444;--text-primary: #f0f2f5;--text-muted: #6b7280;--active-bg: rgba(0, 188, 212, .12);--hover-bg: rgba(255, 255, 255, .05);--surface: #1a1d27;--surface-2: #20232e;--radius: 8px;--transition: .18s ease}.app-shell{display:flex;min-height:100vh;background:#111318;color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.sidebar{width:var(--sidebar-width);min-height:100vh;background:var(--sidebar-bg);border-right:1px solid var(--sidebar-border);display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100;overflow-y:auto;scrollbar-width:none}.sidebar::-webkit-scrollbar{display:none}.sidebar-brand{padding:1.4rem 1.25rem 1rem;border-bottom:1px solid var(--sidebar-border);display:flex;align-items:center;gap:.75rem;text-decoration:none}.sidebar-brand-icon{width:36px;height:36px;background:linear-gradient(135deg,#00bcd4,#0072ff);border-radius:9px;display:flex;align-items:center;justify-content:center;font-size:1.1rem;flex-shrink:0;box-shadow:0 2px 8px #00bcd44d}.sidebar-brand-text{display:flex;flex-direction:column;gap:1px}.sidebar-brand-name{font-size:1rem;font-weight:700;letter-spacing:.02em;color:var(--text-primary);line-height:1.2}.sidebar-brand-tagline{font-size:.65rem;color:var(--text-muted);letter-spacing:.05em;text-transform:uppercase}.sidebar-user{padding:.9rem 1.25rem;border-bottom:1px solid var(--sidebar-border);display:flex;align-items:center;gap:.6rem}.sidebar-avatar{width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,#1e2330,#2d3148);border:1px solid 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var(--sidebar-border);z-index:200;padding-bottom:env(safe-area-inset-bottom,0px)}.bottom-nav-inner{display:flex;height:var(--bottomnav-height);align-items:stretch}.bottom-tab{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;text-decoration:none;color:var(--text-muted);font-size:.65rem;font-weight:600;letter-spacing:.02em;padding:.4rem .25rem;border:none;background:transparent;cursor:pointer;transition:color var(--transition);position:relative;-webkit-tap-highlight-color:transparent;min-width:44px}.bottom-tab:active{background:#ffffff0a}.bottom-tab.active{color:var(--accent)}.bottom-tab.active .tab-icon{transform:translateY(-1px)}.tab-icon{font-size:1.35rem;line-height:1;transition:transform 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