:root{--bg:#f6f8fb;--card:#fff;--text:#152033;--muted:#637083;--brand:#2457f5;--brand-soft:#eaf0ff;--line:#dbe3ef;--danger:#d64545;--ok:#11845b}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:Arial,Apple SD Gothic Neo,Noto Sans KR,sans-serif}a{color:inherit}button,input,select,textarea{font:inherit}.shell{grid-template-columns:260px 1fr;min-height:100vh;display:grid}.sidebar{color:#fff;background:#0f172a;padding:28px 22px}.sidebar h1{margin:0 0 10px;font-size:26px}.sidebar p{color:#b8c2d6;margin:0 0 28px;line-height:1.5}.nav-item{color:#dce6fa;border-radius:12px;margin-bottom:8px;padding:12px 14px;text-decoration:none;display:block}.nav-item.active,.nav-item:hover{background:#ffffff1f}.main{padding:32px}.header{justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:24px;display:flex}.header h2{margin:0 0 8px;font-size:30px}.header p{color:var(--muted);margin:0}.settings{flex-wrap:wrap;justify-content:flex-end;gap:8px;display:flex}.settings input{border:1px solid var(--line);border-radius:10px;min-width:220px;padding:10px 12px}.btn{background:var(--brand);color:#fff;cursor:pointer;border:none;border-radius:10px;padding:10px 14px}.btn.secondary{color:var(--text);background:#e8edf6}.grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-bottom:24px;display:grid}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:0 10px 28px #0f172a0d}.metric-label{color:var(--muted);font-size:14px}.metric-value{margin-top:8px;font-size:32px;font-weight:800}.section{margin-bottom:24px}.section-title{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.section-title h3{margin:0}table{border-collapse:collapse;width:100%}th,td{text-align:left;border-bottom:1px solid var(--line);vertical-align:top;padding:12px 10px;font-size:14px}th{color:var(--muted);font-weight:700}.badge{background:var(--brand-soft);color:var(--brand);border-radius:999px;align-items:center;padding:4px 9px;font-size:12px;font-weight:700;display:inline-flex}.badge.ok{color:var(--ok);background:#e9f8f1}.badge.danger{color:var(--danger);background:#fff0f0}.simulator textarea{border:1px solid var(--line);resize:vertical;border-radius:12px;width:100%;min-height:120px;padding:12px}.simulator .row{gap:10px;margin-top:10px;display:flex}.notice{color:#7a5300;background:#fff8e7;border:1px solid #ffe2a8;border-radius:12px;margin-bottom:18px;padding:12px 14px}@media (max-width:1000px){.shell{grid-template-columns:1fr}.sidebar{border-radius:0 0 24px 24px}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width:640px){.main{padding:20px}.grid{grid-template-columns:1fr}.header{display:block}.settings{justify-content:flex-start;margin-top:16px}}.login-shell{justify-content:center;align-items:center;min-height:100vh;padding:24px;display:flex}.login-card{background:var(--card);border:1px solid var(--line);border-radius:18px;flex-direction:column;gap:14px;width:100%;max-width:380px;padding:32px;display:flex;box-shadow:0 10px 28px #0f172a14}.login-card h1{color:var(--brand);margin:0;font-size:28px}.login-card p{color:var(--muted);margin:0 0 8px}.login-card label,.manage-form label{color:var(--muted);flex-direction:column;gap:6px;font-size:14px;display:flex}.login-card input,.login-card select,.manage-form input,.manage-form select{border:1px solid var(--line);border-radius:10px;padding:10px 12px}.login-card details summary{cursor:pointer;color:var(--muted);font-size:13px}.settings select,.section td select{border:1px solid var(--line);background:#fff;border-radius:10px;padding:9px 10px}.who{background:#ffffff14;border-radius:12px;flex-direction:column;gap:6px;margin-bottom:22px;padding:12px 14px;display:flex}.who strong{font-size:15px}.who .badge{align-self:flex-start}.logout{width:100%;margin-top:24px}.notice.ok{color:var(--ok);background:#e9f8f1;border-color:#b7e6d1}.manage-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;display:grid}.manage-form{border:1px solid var(--line);border-radius:14px;flex-direction:column;gap:12px;padding:18px;display:flex}.manage-form h4{margin:0}@media (max-width:640px){.manage-grid{grid-template-columns:1fr}}