:root{--border: #d9d9d9;--text: #1a1a1a;--muted: #666;--accent: #1f4fd8;--bg: #fafafa;--sidebar-bg: #14171f;--sidebar-text: #cbd0dc;--sidebar-text-active: #ffffff}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--text);background:var(--bg)}.centered-page{min-height:100vh;display:flex;align-items:center;justify-content:center}.card{background:#fff;border:1px solid var(--border);border-radius:8px;padding:2rem;width:320px;display:flex;flex-direction:column;gap:.5rem}.card h1{margin:0;font-size:1.25rem}.subtitle{color:var(--muted);margin-top:0}.muted{color:var(--muted)}label{font-size:.85rem;color:var(--muted);margin-top:.5rem}input,select,textarea{padding:.5rem;border:1px solid var(--border);border-radius:4px;font-size:1rem}button{padding:.5rem 1rem;border:1px solid var(--accent);background:var(--accent);color:#fff;border-radius:4px;cursor:pointer;font-size:.95rem}button:disabled{opacity:.5;cursor:not-allowed}.error{color:#c0271f;font-size:.9rem}.plain-list{list-style:none;padding:0;margin:.5rem 0}.plain-list li{padding:.35rem 0;border-bottom:1px solid var(--border)}.app-shell{display:flex;min-height:100vh}.sidebar{width:220px;flex-shrink:0;background:var(--sidebar-bg);color:var(--sidebar-text);padding:1rem 0;display:flex;flex-direction:column}.sidebar-brand{color:#fff;font-weight:600;padding:0 1.25rem 1rem}.nav-section{padding:.5rem 0 1rem}.nav-section-title{text-transform:uppercase;font-size:.7rem;letter-spacing:.05em;color:#7d8296;padding:0 1.25rem .35rem}.nav-link{display:block;padding:.45rem 1.25rem;color:var(--sidebar-text);text-decoration:none;font-size:.92rem}.nav-link:hover{background:#ffffff0f}.nav-link-active{color:var(--sidebar-text-active);background:#1f4fd859;border-right:3px solid var(--accent)}.app-main{flex:1;display:flex;flex-direction:column;min-width:0}.topbar{display:flex;align-items:center;gap:1rem;padding:.75rem 1.5rem;border-bottom:1px solid var(--border);background:#fff}.user-menu{display:flex;align-items:center;gap:.75rem;margin-left:auto}.content{padding:1.5rem;max-width:1000px;width:100%;margin:0 auto}.hamburger-button{display:none;background:none;border:none;color:var(--text);font-size:1.3rem;padding:.25rem .5rem}.sidebar-backdrop{display:none}@media (max-width: 768px){.hamburger-button{display:block}.sidebar{position:fixed;top:0;bottom:0;left:0;z-index:30;transform:translate(-100%);transition:transform .2s ease}.sidebar-open{transform:translate(0)}.sidebar-backdrop{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;z-index:25}.content{padding:1rem}}