/* 登入頁（版面同 path-report，配色沿用儀表板的深色主題） */
:root{
  --primary:#4f46e5; --primary-light:#818cf8; --danger:#ef4444;
  --bg:#0f172a; --bg-card:#1e293b; --border:#334155;
  --text:#f1f5f9; --text-secondary:#94a3b8;
  --grad:linear-gradient(120deg,#4f46e5,#818cf8);
  --sh-card:0 10px 40px rgba(0,0,0,.4);
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Inter','Noto Sans TC',-apple-system,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}
.center{display:flex;align-items:center;justify-content:center;padding:20px 16px;min-height:100vh;position:relative;overflow:hidden}
.center::before,.center::after{content:'';position:absolute;width:500px;height:500px;z-index:0;pointer-events:none}
.center::before{background:radial-gradient(circle,rgba(79,70,229,.25) 0%,transparent 70%);top:-100px;left:-100px}
.center::after{background:radial-gradient(circle,rgba(129,140,248,.15) 0%,transparent 70%);bottom:-100px;right:-100px}
.card{background:var(--bg-card);border:1px solid var(--border);border-radius:20px;padding:40px 32px;width:100%;
  max-width:400px;box-shadow:var(--sh-card);position:relative;z-index:1}
.logo{font-weight:700;font-size:13px;letter-spacing:.2em;text-transform:uppercase;color:var(--primary-light);
  display:block;text-align:center}
h1{font-size:20px;font-weight:700;text-align:center;margin:6px 0 24px}
label{display:block;font-size:13px;font-weight:600;color:var(--text-secondary);margin:0 0 8px}
.field{margin-bottom:24px}
input{width:100%;padding:14px 16px;border:1px solid var(--border);border-radius:10px;background:var(--bg);
  color:var(--text);font:inherit;font-size:16px;outline:none;transition:border-color .2s,box-shadow .2s}
input:focus{border-color:var(--primary-light);box-shadow:0 0 0 3px rgba(129,140,248,.2)}
.btn{background:var(--grad);color:#fff;border:0;padding:14px;border-radius:10px;font:inherit;font-size:16px;font-weight:600;
  cursor:pointer;width:100%;box-shadow:0 4px 15px rgba(79,70,229,.35);transition:transform .2s}
.btn:hover{transform:translateY(-2px)}
.btn:disabled{opacity:.6;cursor:wait;transform:none}
.msg{padding:12px;border-radius:10px;font-size:14px;margin-bottom:20px;line-height:1.6}
.msg.err{background:rgba(239,68,68,.12);border-left:4px solid var(--danger);color:#fca5a5}
.hidden{display:none!important}