:root {
  color-scheme: light;
  --canvas: #eef6ff;
  --surface: rgba(255, 255, 255, .66);
  --ink: #14213d;
  --muted: #7d8da6;
  --blue: #3564ff;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: linear-gradient(135deg, #eef6ff, #f5f9ff 48%, #eaf2ff);
  color: var(--ink);
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  background: linear-gradient(135deg, #eef6ff, #f5f9ff 48%, #eaf2ff);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background: linear-gradient(120deg, rgba(255, 255, 255, .48), transparent 36%, rgba(185, 213, 255, .16));
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-panel {
  width: min(100%, 430px);
  padding: 42px 38px 38px;
  background: rgba(255, 255, 255, .58);
  border: 1px solid rgba(255, 255, 255, .84);
  border-radius: 24px;
  box-shadow: 0 18px 52px rgba(80, 120, 180, .14), inset 0 1px 0 rgba(255, 255, 255, .86);
  backdrop-filter: blur(22px) saturate(155%);
  -webkit-backdrop-filter: blur(22px) saturate(155%);
}

.brand-mark {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: linear-gradient(135deg, #4d8cff 0%, #3564ff 62%, #5878f7 100%);
  color: #fff;
  font-size: 28px;
  font-weight: 700;
  box-shadow: 0 10px 24px rgba(53, 100, 255, .25), inset 0 1px 0 rgba(255, 255, 255, .38);
}

.eyebrow {
  margin: 25px 0 8px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 700;
}

h1 { margin: 0; font-size: 30px; letter-spacing: 0; }
.login-subtitle { margin: 10px 0 28px; color: var(--muted); font-size: 14px; }

label {
  display: block;
  margin: 16px 0 8px;
  color: #526684;
  font-size: 13px;
  font-weight: 700;
}

input {
  width: 100%;
  height: 46px;
  padding: 0 13px;
  border: 1px solid rgba(255, 255, 255, .86);
  border-radius: 14px;
  color: var(--ink);
  background: rgba(255, 255, 255, .58);
  font: inherit;
  outline: none;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .78);
}

input:focus { border-color: rgba(53, 100, 255, .56); box-shadow: 0 0 0 3px rgba(53, 100, 255, .12), inset 0 1px 0 rgba(255, 255, 255, .78); }

button {
  width: 100%;
  height: 46px;
  margin-top: 20px;
  border: 0;
  border-radius: 14px;
  background: linear-gradient(135deg, #4d8cff 0%, #3564ff 62%, #5878f7 100%);
  color: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(53, 100, 255, .2), inset 0 1px 0 rgba(255, 255, 255, .3);
}

button:hover { background: linear-gradient(135deg, #3e7fff 0%, #2955ed 62%, #4c6df0 100%); }
button:disabled { cursor: wait; opacity: .6; }
.login-error { margin: 14px 0 0; color: #c53636; font-size: 13px; }

@media (max-width: 480px) {
  .login-panel { padding: 34px 24px 28px; }
}