:root {
  --blk: #1e4d5c;
  --grey: #8aaeb4;
  --grad: linear-gradient(135deg, #94d4a8 0%, #34acc2 100%);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Noto Sans SC', sans-serif;
  background: #f0f8fa;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blk);
}
.card {
  background: #fff;
  border: 1px solid rgba(138,174,180,0.35);
  border-radius: 8px;
  padding: 48px 40px 40px;
  width: 360px;
  box-shadow: 0 4px 24px rgba(30,77,92,0.08);
}
.logo {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-align: center;
  color: var(--blk);
  margin-bottom: 32px;
}
label {
  display: block;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--grey);
  margin-bottom: 6px;
  margin-top: 20px;
}
input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid rgba(138,174,180,0.5);
  border-radius: 4px;
  font-family: inherit;
  font-size: 14px;
  color: var(--blk);
  background: #fff;
  outline: none;
  transition: border-color 0.2s;
}
input:focus { border-color: var(--grey); }
.btn {
  width: 100%;
  margin-top: 28px;
  padding: 12px;
  border: none;
  border-radius: 4px;
  background: var(--grad);
  color: #fff;
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: opacity 0.2s;
}
.btn:hover { opacity: 0.88; }
.error {
  display: none;
  margin-top: 16px;
  font-size: 12px;
  color: #c0392b;
  text-align: center;
}
.error.show { display: block; }