:root {
  color-scheme: light;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: #15171a;
  background: #f4f6f8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background:
    linear-gradient(135deg, rgba(255, 112, 31, 0.08), transparent 35%),
    #f4f6f8;
}

button, input { font: inherit; letter-spacing: 0; }

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 20px;
}

.login-panel {
  width: min(100%, 420px);
  padding: 36px 40px 32px;
  background: #ffffff;
  border: 1px solid #e3e7eb;
  border-radius: 8px;
  box-shadow: 0 18px 50px rgba(26, 32, 44, 0.1);
}

form { display: grid; gap: 20px; }
label { display: grid; gap: 8px; color: #424850; font-size: 14px; font-weight: 600; }
input {
  width: 100%;
  height: 44px;
  padding: 0 13px;
  color: #15171a;
  background: #ffffff;
  border: 1px solid #cfd5dc;
  border-radius: 6px;
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}
input:focus { border-color: #ed6a22; box-shadow: 0 0 0 3px rgba(237, 106, 34, 0.14); }

.password-field { position: relative; }
.password-field input { padding-right: 60px; }
.password-field button {
  position: absolute;
  inset: 6px 6px 6px auto;
  padding: 0 10px;
  color: #656c75;
  background: transparent;
  border: 0;
  cursor: pointer;
}

.login-button {
  height: 44px;
  color: #ffffff;
  background: #1d69e8;
  border: 0;
  border-radius: 6px;
  font-weight: 650;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(29, 105, 232, 0.2);
}
.login-button:hover { background: #175dce; }
.login-button:disabled { cursor: wait; opacity: 0.7; }

.login-error {
  margin: -4px 0 0;
  padding: 10px 12px;
  color: #b42318;
  background: #fff1f0;
  border: 1px solid #ffd2cf;
  border-radius: 6px;
  font-size: 13px;
}

.session-note { margin: 24px 0 0; color: #8a9199; font-size: 12px; text-align: center; }

@media (max-width: 520px) {
  .login-shell { padding: 16px; }
  .login-panel { padding: 28px 24px 24px; }
}