:root{--bg:#f4f6f8;--card:#ffffff;--border:#e3e7eb;--text:#24313f;--muted:#6b7785;--primary:#2f7cf6;--primary-dark:#1d64d6;--secondary:#6c757d;--secondary-dark:#545b62;--danger:#dc3545;--danger-dark:#b02a37;--sidebar:#1f2937;--sidebar-text:#e5e7eb;--sidebar-active:#374151;--radius:12px;--shadow:0 4px 14px rgba(0,0,0,.08)}*{box-sizing:border-box}body{margin:0;font-family:Arial,sans-serif;background:var(--bg);color:var(--text)}a{text-decoration:none}.login-wrapper{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.login-card{width:100%;max-width:420px;background:var(--card);border-radius:18px;box-shadow:var(--shadow);padding:30px}.login-card h1{margin:0 0 10px;text-align:center}.login-subtitle{text-align:center;color:var(--muted);margin:0 0 24px}.app-layout{display:flex;min-height:100vh}.sidebar{width:250px;background:var(--sidebar);color:var(--sidebar-text);display:flex;flex-direction:column;transition:transform .2s ease}.sidebar-brand{padding:18px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid rgba(255,255,255,.08)}.brand-title{font-weight:bold;font-size:18px}.sidebar-toggle,.mobile-toggle{background:transparent;border:none;color:inherit;font-size:20px;cursor:pointer}.mobile-toggle{display:none;margin-right:12px}.sidebar-nav{display:flex;flex-direction:column;padding:12px}.sidebar-nav a{color:var(--sidebar-text);padding:12px 14px;border-radius:10px;margin-bottom:6px}.sidebar-nav a:hover,.sidebar-nav a.active{background:var(--sidebar-active)}.main-content{flex:1;min-width:0}.topbar{background:#fff;border-bottom:1px solid var(--border);padding:16px 22px;display:flex;justify-content:space-between;align-items:center}.page-title{font-weight:bold;font-size:20px}.user-box{color:var(--muted)}.content{padding:24px}.panel{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;margin-bottom:20px}.panel-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;gap:12px;flex-wrap:wrap}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.form-grid.compact{grid-template-columns:repeat(2,minmax(0,260px))}.form-group{display:flex;flex-direction:column;gap:6px}.form-group.full,.form-actions{grid-column:1 / -1}.form-group label{font-weight:bold}.form-group input,.form-group select,.form-group textarea{width:100%;padding:12px;border:1px solid var(--border);border-radius:10px;font-size:15px;background:#fff}.form-group textarea{resize:vertical}.form-actions{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.btn{border:none;border-radius:10px;padding:12px 16px;cursor:pointer;font-size:15px}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-secondary{background:var(--secondary);color:#fff}.btn-secondary:hover{background:var(--secondary-dark)}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover{background:var(--danger-dark)}.btn-full{width:100%}.btn-sm{padding:8px 12px;font-size:13px}.message-box{margin-top:16px;padding:12px;border-radius:10px}.message-box.hidden{display:none}.message-box.success{background:#d4edda;color:#155724}.message-box.error{background:#f8d7da;color:#721c24}.table-wrap{overflow-x:auto}.table{width:100%;border-collapse:collapse}.table th,.table td{padding:12px;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}.table td.actions{white-space:nowrap}.permissions-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 16px;padding:12px;border:1px solid var(--border);border-radius:10px;background:#fafafa}.permission-item{display:flex;align-items:center;gap:8px}.file-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:12px}.file-card{border:1px solid var(--border);border-radius:10px;padding:12px;background:#fafafa}.muted{color:var(--muted)}@media(max-width:980px){.file-list{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:768px){.mobile-toggle{display:inline-block}.sidebar{position:fixed;inset:0 auto 0 0;height:100vh;z-index:1000;transform:translateX(-100%)}.sidebar.open{transform:translateX(0)}.content{padding:16px}.form-grid,.form-grid.compact,.permissions-grid,.file-list{grid-template-columns:1fr}.panel-header,.form-actions{flex-direction:column;align-items:stretch}}