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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo",
               "Pretendard", "Malgun Gothic", sans-serif;
  background: #f5f6f8;
  color: #1a1d23;
  -webkit-font-smoothing: antialiased;
}

.login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  padding: 24px;
}

.login-box {
  background: #fff;
  padding: 40px;
  border-radius: 16px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.login-logo { text-align: center; margin-bottom: 28px; }
.logo-icon {
  width: 56px; height: 56px;
  margin: 0 auto 12px;
  background: linear-gradient(135deg, #2c3e50, #34495e);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 28px;
}
.login-logo h1 { font-size: 19px; font-weight: 700; letter-spacing: -0.02em; }
.login-logo p  { font-size: 12px; color: #6b7280; margin-top: 4px; }

.login-form { display: flex; flex-direction: column; gap: 12px; }
.login-form .field label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: #4b5563;
  margin-bottom: 4px;
}
.login-form input {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid #d1d5db;
  border-radius: 9px;
  font-size: 14px;
  font-family: inherit;
}
.login-form input:focus { outline: none; border-color: #1a1d23; }

.login-btn {
  width: 100%;
  padding: 12px;
  background: #1a1d23;
  color: #fff;
  border: none;
  border-radius: 9px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 8px;
  font-family: inherit;
}
.login-btn:hover    { background: #2d3138; }
.login-btn:disabled { background: #9ca3af; cursor: not-allowed; }

.login-error {
  background: #fef2f2;
  color: #991b1b;
  padding: 10px 12px;
  border-radius: 7px;
  font-size: 12px;
  margin-top: 8px;
  display: none;
}
.login-error.show { display: block; }

.login-help {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid #e8eaed;
  font-size: 11px;
  color: #6b7280;
  line-height: 1.7;
}
.login-help b { color: #1a1d23; }
.login-help code {
  background: #f1f3f5;
  padding: 1px 5px;
  border-radius: 3px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
}