:root {
  --blue: #1a73e8;
  --blue-dark: #1557b0;
  --blue-light: #e8f0fe;
  --bg: #f8f9fa;
  --white: #ffffff;
  --border: #dadce0;
  --text: #202124;
  --text-muted: #5f6368;
  --red: #d93025;
  --green: #188038;
  --shadow: 0 1px 3px rgba(0,0,0,.12), 0 1px 2px rgba(0,0,0,.08);
  --radius: 8px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-wrap {
  width: 100%;
  max-width: 400px;
  padding: 24px 16px;
}

.login-brand {
  text-align: center;
  margin-bottom: 32px;
}
.login-brand-icon {
  width: 48px;
  height: 48px;
  background: var(--blue);
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}
.login-brand h1 {
  font-size: 22px;
  font-weight: 600;
  color: var(--text);
}
.login-brand p {
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 4px;
}

.login-card {
  background: var(--white);
  border-radius: 12px;
  box-shadow: var(--shadow), 0 4px 16px rgba(0,0,0,.08);
  overflow: hidden;
}

.login-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}
.login-tab {
  flex: 1;
  padding: 14px;
  text-align: center;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  color: var(--text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  transition: all .15s;
}
.login-tab.active {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

.login-form {
  padding: 24px;
  display: none;
}
.login-form.active { display: block; }

.form-group {
  margin-bottom: 16px;
}
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text);
}
.form-group input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  outline: none;
  background: var(--white);
  transition: border-color .15s, box-shadow .15s;
}
.form-group input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px var(--blue-light);
}

.btn-submit {
  width: 100%;
  padding: 10px;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background .15s;
  margin-top: 4px;
}
.btn-submit:hover { background: var(--blue-dark); }
.btn-submit:disabled { opacity: .6; cursor: default; }

.form-error {
  margin-top: 12px;
  padding: 10px 12px;
  background: #fce8e6;
  color: var(--red);
  border-radius: 6px;
  font-size: 13px;
  display: none;
}
.form-error.show { display: block; }

.form-success {
  margin-top: 12px;
  padding: 10px 12px;
  background: #e6f4ea;
  color: var(--green);
  border-radius: 6px;
  font-size: 13px;
  display: none;
}
.form-success.show { display: block; }

.mfa-group {
  display: none;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.mfa-group.show { display: block; }
.mfa-group label {
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 6px;
  display: block;
}
.mfa-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 8px;
}