:root { --bg:#f4f6f9; --fg:#1a1a1a; --muted:#5f6368; --pri:#1a56db; --ok:#16a34a; --card:#ffffff; --border:#d1d5db; --sidebar-bg:#e8ecf1; --sidebar-border:#c5ccd6; --topbar-bg:#ffffff; --input-bg:#ffffff; }
*{box-sizing:border-box} body{margin:0;font-family:system-ui,Segoe UI,Roboto,Arial;background:var(--bg);color:var(--fg)}
.wrap{max-width:1000px;margin:0 auto;padding:16px}
.layout{display:flex;gap:16px}
.sidebar{width:200px}
.content{flex:1}
.side{display:flex;flex-direction:column;gap:6px}
.side a{display:block;padding:8px 10px;border-radius:6px;background:var(--sidebar-bg);border:1px solid var(--sidebar-border);color:#1a1a1a;font-weight:500}
.side a:hover{background:#dce1e8}
.topbar{background:var(--topbar-bg);border-bottom:1px solid var(--border);box-shadow:0 1px 3px rgba(0,0,0,.08)}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between}
a{color:var(--pri);text-decoration:none}
a:hover{text-decoration:underline}
.btn, button{background:var(--pri);color:#fff;border:none;padding:8px 12px;border-radius:6px;cursor:pointer;font-weight:500}
.btn:hover, button:hover{background:#1345b5}
button{margin:4px 0}
.table{width:100%;border-collapse:collapse;margin-top:12px}
.table th,.table td{border-bottom:1px solid var(--border);padding:8px;vertical-align:top}
.table th{color:var(--fg);font-weight:600}
.row{display:flex;gap:8px;align-items:center}
.card{background:var(--card);padding:16px;border:1px solid var(--border);border-radius:8px;max-width:520px;box-shadow:0 1px 3px rgba(0,0,0,.06)}
label{display:block;margin:8px 0;font-weight:500}
input,textarea{width:100%;padding:8px;border-radius:6px;border:1px solid var(--border);background:var(--input-bg);color:var(--fg)}
input:focus,textarea:focus{outline:none;border-color:var(--pri);box-shadow:0 0 0 2px rgba(26,86,219,.2)}
.error{background:#fef2f2;color:#991b1b;border:1px solid #fca5a5;padding:8px;border-radius:6px;margin-bottom:8px}
.ok{background:#f0fdf4;color:#166534;border:1px solid #86efac}
.footer{color:var(--muted);border-top:1px solid var(--border);margin-top:32px;padding:16px 0}
.muted{color:var(--muted)}