/* Login page modern UI */
:root{
  --bg-grad-1:#0f2027; --bg-grad-2:#203a43; --bg-grad-3:#2c5364;
  --primary:#ff6b6b; --primary-2:#feca57; --accent:#667eea; --accent-2:#764ba2;
  --card-bg:rgba(255,255,255,0.08); --glass:rgba(255,255,255,0.12);
  --border:rgba(255,255,255,0.15);
}
*{box-sizing:border-box}
body{min-height:100vh;margin:0;font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;color:#fff}
.login-page{position:relative;min-height:100vh;display:flex;align-items:center}
.login-page::before{content:"";position:fixed;inset:0;background:linear-gradient(135deg,var(--bg-grad-1),var(--bg-grad-2),var(--bg-grad-3));}
.decor{position:fixed;border-radius:50%;filter:blur(60px);opacity:.25;z-index:0}
.decor-1{width:380px;height:380px;background:radial-gradient(circle at 30% 30%,#00d2ff,transparent 60%);top:8%;left:8%}
.decor-2{width:420px;height:420px;background:radial-gradient(circle at 70% 70%,#ff6b6b,transparent 60%);bottom:8%;right:10%}
.container{position:relative;z-index:1}
.login-card{background:var(--card-bg);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--border);border-radius:20px;overflow:hidden;transition:transform .25s ease, box-shadow .25s ease}
.login-card:hover{transform:translateY(-2px);box-shadow:0 20px 60px rgba(0,0,0,.35)}
.login-header{padding:2.25rem 2rem;background:linear-gradient(45deg,rgba(255,107,107,.35),rgba(254,202,87,.25));border-bottom:1px solid var(--border)}
.brand{width:68px;height:68px;margin:0 auto 12px auto;border-radius:16px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#ff6b6b,#feca57);color:#1b1b1b;box-shadow:0 15px 40px rgba(255,107,107,.35)}
.brand i{font-size:30px}
.title{margin:0;font-weight:700;letter-spacing:.5px}
.subtitle{opacity:.85;margin-top:4px;font-size:.95rem}
.login-body{background:transparent}
.form-control{background:rgba(255,255,255,.06);border:2px solid rgba(255,255,255,.15);color:#fff}
.form-control::placeholder{color:rgba(255,255,255,.6)}
.form-control:focus{border-color:#ff6b6b;box-shadow:0 0 0 .2rem rgba(255,107,107,.25)}
.form-floating>label{color:#ddd}
.form-check-input{cursor:pointer}
.btn-login{background:linear-gradient(45deg,var(--accent),var(--accent-2));border:none;border-radius:12px;padding:.85rem 1.1rem;font-weight:700;letter-spacing:.5px;box-shadow:0 10px 30px rgba(102,126,234,.25);transition:all .25s ease}
.btn-login:hover{transform:translateY(-1px);box-shadow:0 14px 36px rgba(102,126,234,.35)}
.loading{display:none}
.loading.show{display:inline-block}
.hint{opacity:.8}
/* 密碼顯示/隱藏按鈕 */
.position-relative .toggle-pass{position:absolute;top:50%;right:12px;transform:translateY(-50%);border:none;background:transparent;color:#ddd}
.position-relative .toggle-pass:hover{color:#fff}
@media (max-width: 576px){
  .login-header{padding:1.5rem 1.25rem}
  .login-body{padding:1.25rem}
}