:root{
  --ink:#e5f6ff;
  --muted:#8fb3c7;
  --line:rgba(148,211,255,.22);
  --cyan:#38d5ff;
  --green:#22c55e;
  --blue:#2563eb;
  --panel:rgba(8,18,38,.72);
}

*{box-sizing:border-box}

body{
  min-height:100vh;
  margin:0;
  font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;
  color:var(--ink);
  background:
    radial-gradient(circle at 16% 20%,rgba(56,213,255,.22),transparent 28%),
    radial-gradient(circle at 88% 76%,rgba(34,197,94,.18),transparent 30%),
    linear-gradient(135deg,#020617 0%,#07152f 48%,#0b2b3a 100%);
  overflow:hidden;
}

body:before{
  content:"";
  position:fixed;
  inset:0;
  background:
    linear-gradient(rgba(148,211,255,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(148,211,255,.06) 1px,transparent 1px);
  background-size:42px 42px;
  mask-image:linear-gradient(to bottom,rgba(0,0,0,.9),transparent 88%);
  pointer-events:none;
}

.login-shell{
  position:relative;
  z-index:1;
  min-height:100vh;
  display:grid;
  grid-template-columns:minmax(0,1.1fr) 430px;
  gap:54px;
  align-items:center;
  width:min(1120px,calc(100% - 40px));
  margin:0 auto;
}

.login-visual{
  position:relative;
  min-height:500px;
  border:1px solid var(--line);
  border-radius:34px;
  overflow:hidden;
  background:
    linear-gradient(135deg,rgba(255,255,255,.08),rgba(255,255,255,.02)),
    radial-gradient(circle at 70% 30%,rgba(56,213,255,.18),transparent 28%);
  box-shadow:0 30px 90px rgba(0,0,0,.34);
}

.grid-plane{
  position:absolute;
  left:-12%;
  right:-12%;
  bottom:-22%;
  height:52%;
  background:
    linear-gradient(rgba(56,213,255,.32) 1px,transparent 1px),
    linear-gradient(90deg,rgba(56,213,255,.28) 1px,transparent 1px);
  background-size:38px 38px;
  transform:perspective(520px) rotateX(62deg);
  transform-origin:center top;
  opacity:.55;
}

.orb{
  position:absolute;
  border-radius:999px;
  filter:blur(4px);
}

.orb-a{
  width:220px;
  height:220px;
  left:54px;
  top:56px;
  background:radial-gradient(circle,#38d5ff,transparent 68%);
  opacity:.48;
  animation:floatA 7s ease-in-out infinite;
}

.orb-b{
  width:160px;
  height:160px;
  right:68px;
  bottom:108px;
  background:radial-gradient(circle,#22c55e,transparent 68%);
  opacity:.42;
  animation:floatB 8s ease-in-out infinite;
}

.system-card{
  position:absolute;
  left:48px;
  right:48px;
  top:50%;
  transform:translateY(-50%);
  display:flex;
  align-items:center;
  gap:22px;
  padding:28px;
  border:1px solid rgba(255,255,255,.18);
  border-radius:26px;
  background:rgba(2,6,23,.52);
  backdrop-filter:blur(18px);
  box-shadow:0 20px 60px rgba(0,0,0,.28);
}

.signal{
  width:78px;
  height:78px;
  flex:0 0 auto;
  border-radius:24px;
  background:
    radial-gradient(circle at 50% 50%,#fff 0 8px,transparent 9px),
    conic-gradient(from 0deg,#38d5ff,#22c55e,#2563eb,#38d5ff);
  box-shadow:0 0 34px rgba(56,213,255,.42);
}

.eyebrow{
  margin:0 0 8px;
  color:#67e8f9;
  font-size:12px;
  font-weight:900;
  letter-spacing:.16em;
  text-transform:uppercase;
}

h1{
  margin:0 0 10px;
  font-size:38px;
  letter-spacing:.02em;
}

.system-card p:last-child{
  margin:0;
  color:#b7d4e5;
  line-height:1.8;
}

.box{
  position:relative;
  padding:34px;
  border:1px solid rgba(148,211,255,.26);
  border-radius:28px;
  background:var(--panel);
  backdrop-filter:blur(20px);
  box-shadow:0 28px 80px rgba(0,0,0,.42), inset 0 1px 0 rgba(255,255,255,.08);
}

.box:before{
  content:"";
  position:absolute;
  inset:-1px;
  border-radius:28px;
  padding:1px;
  background:linear-gradient(135deg,rgba(56,213,255,.76),transparent 36%,rgba(34,197,94,.5));
  mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  mask-composite:exclude;
  pointer-events:none;
}

.login-mark{
  width:48px;
  height:48px;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:18px;
  border-radius:16px;
  color:#fff;
  font-weight:900;
  background:linear-gradient(135deg,var(--cyan),var(--blue));
  box-shadow:0 12px 28px rgba(56,213,255,.28);
}

h2{
  margin:0 0 24px;
  font-size:28px;
}

label{
  display:block;
  margin:14px 0;
}

label span{
  display:block;
  margin-bottom:8px;
  color:#b7d4e5;
  font-size:13px;
  font-weight:700;
}

input{
  width:100%;
  padding:14px 15px;
  border:1px solid rgba(148,211,255,.24);
  border-radius:14px;
  outline:none;
  color:#f8fafc;
  background:rgba(2,6,23,.46);
  transition:.18s;
}

input::placeholder{color:#64889d}

input:focus{
  border-color:rgba(56,213,255,.8);
  box-shadow:0 0 0 4px rgba(56,213,255,.12);
  background:rgba(2,6,23,.68);
}

button{
  width:100%;
  margin-top:12px;
  padding:14px 16px;
  border:0;
  border-radius:14px;
  color:#fff;
  font-weight:900;
  letter-spacing:.04em;
  cursor:pointer;
  background:linear-gradient(135deg,#38d5ff,#2563eb 58%,#22c55e);
  box-shadow:0 16px 34px rgba(37,99,235,.34);
  transition:.18s;
}

button:hover{
  transform:translateY(-2px);
  filter:brightness(1.06);
}

@keyframes floatA{
  0%,100%{transform:translate3d(0,0,0)}
  50%{transform:translate3d(18px,22px,0)}
}

@keyframes floatB{
  0%,100%{transform:translate3d(0,0,0)}
  50%{transform:translate3d(-20px,-16px,0)}
}

@media(max-width:860px){
  body{overflow:auto}
  .login-shell{
    grid-template-columns:1fr;
    gap:18px;
    padding:28px 0;
  }
  .login-visual{
    min-height:230px;
  }
  .system-card{
    left:20px;
    right:20px;
    padding:20px;
  }
  .signal{
    width:56px;
    height:56px;
    border-radius:18px;
  }
  h1{font-size:26px}
  .box{padding:26px}
}