/* Modern auth UI (adapted from 登录ui.html) */

*{margin:0;padding:0;box-sizing:border-box}

body{
  background:#f5f7fa;
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:1rem;
  line-height:1.5;
  color:#1e293b;
}

/* Toast */
.toast{
  position:fixed;
  top:18px;
  left:50%;
  transform:translateX(-50%) translateY(-10px);
  background:#0f172a;
  color:#fff;
  padding:10px 14px;
  border-radius:10px;
  opacity:0;
  pointer-events:none;
  transition:opacity .2s ease, transform .2s ease;
  z-index:9999;
  box-shadow:0 18px 45px -20px rgba(15,23,42,.55);
}
.toast.show{
  opacity:1;
  transform:translateX(-50%) translateY(0);
}

/* Card container */
.card-stack{
  position:relative;
  width:100%;
  max-width:400px;
}

/* Card */
.card{
  background:#fff;
  width:100%;
  border-radius:.75rem;
  box-shadow:
    0 25px 45px -15px rgba(0,10,30,.10),
    0 10px 20px -10px rgba(0,0,0,.02),
    0 0 0 1px rgba(0,0,0,.01) inset,
    0 0 0 1px rgba(255,255,255,.80) inset;
  transition:box-shadow .3s ease, transform .3s ease;
}
.card:hover{
  box-shadow:
    0 35px 55px -18px rgba(0,20,40,.15),
    0 12px 25px -12px rgba(0,0,0,.05),
    0 0 0 1px rgba(0,0,0,.02) inset,
    0 0 0 1px rgba(255,255,255,.90) inset;
  transform:translateY(-3px);
}

#loginCard{padding:1.6rem 1.8rem 1.9rem;}
#registerCard{padding:1.5rem 1.8rem 2rem;}

h2{
  text-align:center;
  font-weight:600;
  letter-spacing:-0.03em;
  color:#0f172a;
  position:relative;
}
#loginCard h2{font-size:2.0rem;margin-bottom:1.2rem;}
#registerCard h2{font-size:2rem;margin-bottom:1.2rem;letter-spacing:-0.02em;}
h2::after{
  content:'';
  display:block;
  width:40px;
  height:3px;
  background:#3b82f6;
  border-radius:1.5px;
  margin:.8rem auto 0;
  opacity:.30;
}
#registerCard h2::after{width:36px;margin:.5rem auto 0;}

.input-group{position:relative;}
#loginCard .input-group{margin-bottom:1.6rem;}
#registerCard .input-group{margin-bottom:1rem;}

.input-group i{
  position:absolute;
  left:1.2rem;
  top:50%;
  transform:translateY(-50%);
  font-size:1.2rem;
  color:#a0b3cc;
  transition:color .2s ease;
  pointer-events:none;
}
#registerCard .input-group i{left:1rem;font-size:1rem;}

.input-group input{
  width:100%;
  background:#fff;
  border:1px solid #e2e8f0;
  outline:none;
  transition:border-color .2s, box-shadow .2s;
  caret-color:#3b82f6;
  color:#1e293b;
  font-weight:450;
}
#loginCard .input-group input{
  padding:.8rem 1rem .8rem 2.6rem;
  font-size:.95rem;
  border-radius:.5rem;
}
#registerCard .input-group input{
  padding:.8rem 1rem .8rem 2.6rem;
  font-size:.95rem;
  border-radius:.5rem;
}

.input-group input::placeholder{color:#b7c8dd;font-weight:400;}
#loginCard .input-group input::placeholder{font-size:.95rem;}
#registerCard .input-group input::placeholder{font-size:.9rem;}

.input-group:focus-within i{color:#3b82f6;}
.input-group input:focus{
  border-color:#3b82f6;
  box-shadow:0 0 0 4px rgba(59,130,246,.10);
}

.login-btn,.register-btn{
  width:100%;
  border:none;
  border-radius:.5rem;
  cursor:pointer;
  transition:background .2s, box-shadow .2s, transform .1s;
  background:#3b82f6;
  color:#fff;
  font-weight:500;
}
.login-btn{
  padding:.8rem;
  font-size:1rem;
  letter-spacing:.2px;
  box-shadow:0 6px 14px -6px rgba(59,130,246,.50);
  margin-top:.25rem;
}
.register-btn{
  padding:.8rem;
  font-size:1rem;
  box-shadow:0 6px 14px -6px rgba(59,130,246,.50);
  margin-top:.2rem;
}
.login-btn:hover,.register-btn:hover{background:#2563eb;}
.login-btn:hover{box-shadow:0 14px 26px -12px #2563eb;}
.register-btn:hover{box-shadow:0 10px 18px -10px #2563eb;}
.login-btn:active,.register-btn:active{transform:scale(.98);}

.signup-row,#loginCard .login-redirect{margin-top:1.1rem;font-size:.95rem;}

.signup-row{
  width:100%;
  margin-top:1.1rem;
  font-size:.95rem;
  text-align:center;
}
.signup-row span,.signup-row a{
  display:inline;
}

.login-redirect{
  width:100%;
  text-align:center;
  margin-top:2rem;
  color:#5f6f82;
  font-size:1rem;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:.2rem;
  flex-wrap:wrap;
}
#registerCard .login-redirect{margin-top:1.2rem;font-size:.95rem;}
.signup-row span,.login-redirect span{font-weight:400;opacity:.8;}

.signup-row a,.login-redirect a,.captcha-link{
  color:#3b82f6;
  font-weight:600;
  text-decoration:none;
  position:relative;
  padding:.1rem .2rem;
  cursor:pointer;
  transition:color .2s;
}
.signup-row a::after,.login-redirect a::after,.captcha-link::after{
  content:'';
  position:absolute;
  bottom:-1px;
  left:.2rem;
  right:.2rem;
  height:1.5px;
  background:#3b82f6;
  transform:scaleX(0);
  transform-origin:right;
  transition:transform .2s ease-out;
}
.signup-row a:hover,.login-redirect a:hover,.captcha-link:hover{color:#2563eb;}
.signup-row a:hover::after,.login-redirect a:hover::after,.captcha-link:hover::after{
  transform:scaleX(1);
  transform-origin:left;
}

.captcha-container{margin-bottom:1.2rem;}
.captcha-row{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:.5rem;
}
.captcha-equation{
  font-weight:500;
  color:#1e293b;
  background:#f1f5f9;
  padding:.2rem .8rem;
  border-radius:2rem;
  font-size:.95rem;
  border:1px solid #e9eef3;
}
.captcha-input{
  width:100%;
  padding:.8rem 1rem;
  font-size:.95rem;
  background:#fff;
  border:1px solid #e2e8f0;
  border-radius:.5rem;
  outline:none;
}
.captcha-input:focus{
  border-color:#3b82f6;
  box-shadow:0 0 0 4px rgba(59,130,246,.10);
}

.hint{
  margin-top:.9rem;
  text-align:center;
  color:#64748b;
  font-size:.92rem;
}

.err{
  margin-top:1rem;
  text-align:center;
  color:#dc2626;
  font-weight:600;
  font-size:.95rem;
}

.copyright{
  text-align:center;
  font-size:.85rem;
  color:#9aa9bb;
  margin-top:2.5rem;
  padding-top:1.2rem;
  border-top:1px solid #eaf0f6;
  letter-spacing:.2px;
}
#registerCard .copyright{font-size:.8rem;margin-top:1.5rem;padding-top:.8rem;}

@media (max-width:480px){
  body{padding:.8rem;}
  #loginCard{padding:1.6rem 1.8rem 1.9rem;}
  #registerCard{padding:1.2rem 1.5rem 1.8rem;}
  #registerCard h2{font-size:1.8rem;margin-bottom:1rem;}
  #registerCard .input-group{margin-bottom:.8rem;}
  #registerCard .input-group input{padding:.7rem .8rem .7rem 2.4rem;font-size:.9rem;}
  .captcha-equation{font-size:.9rem;}
  .register-btn{padding:.7rem;font-size:.95rem;}
}


/* --- Extra compact login (no gradients) --- */
body.is-login .card-stack{max-width:360px;}
body.is-login #loginCard{padding:1.25rem 1.45rem 1.45rem;}
body.is-login #loginCard h2{font-size:1.72rem;margin-bottom:.9rem;}
body.is-login #loginCard .subtitle{margin-top:-.55rem;margin-bottom:.8rem;font-size:.9rem;}
body.is-login #loginCard .input-group{margin-bottom:.85rem;}
body.is-login #loginCard .input-group input{
  padding:.72rem .9rem .72rem 2.45rem;
  font-size:.92rem;
  border-radius:.45rem;
}
body.is-login #loginCard .login-btn{
  padding:.72rem;
  font-size:.95rem;
  margin-top:.15rem;
}
body.is-login #loginCard .login-redirect{margin-top:.85rem;}