* { box-sizing: border-box; }
body { margin: 0; font-family: Roboto, Arial, sans-serif; background: #fff; display: flex; justify-content: center; align-items: center; min-height: 100vh; color: #202124; }
.card { width: 340px; background: #fff; border: 1px solid #d3d3d3; border-radius: 3px; padding: 36px 28px 20px; box-shadow: 0 1px 4px rgba(0,0,0,0.1); text-align: center; }
.g-logo { margin: 0 auto 20px; width: 48px; height: 48px; }
.title { font-size: 20px; font-weight: 500; margin: 0 0 24px; color: #202124; }
.checkbox-row { display: flex; align-items: center; gap: 16px; padding: 16px 0; border-top: 1px solid #e0e0e0; border-bottom: 1px solid #e0e0e0; }
.recaptcha-checkbox { position: relative; width: 28px; height: 28px; border: 2px solid #c1c1c1; border-radius: 2px; background: #fff; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.15s; flex-shrink: 0; }
.recaptcha-checkbox:hover { border-color: #4285F4; }
.recaptcha-checkbox .check { width: 20px; height: 20px; display: none; }
.recaptcha-checkbox.checked { background: #4285F4; border-color: #4285F4; }
.recaptcha-checkbox.checked .check { display: block; }
.recaptcha-checkbox .spinner { display: none; position: absolute; width: 18px; height: 18px; border: 2px solid #e0e0e0; border-top-color: #4285F4; border-radius: 50%; animation: spin 0.8s linear infinite; }
.recaptcha-checkbox.loading .check { display: none; }
.recaptcha-checkbox.loading .spinner { display: block; }
.recaptcha-checkbox.loading { background: #fff; border-color: #4285F4; }
@keyframes spin { to { transform: rotate(360deg); } }
.checkbox-label { font-size: 14px; color: #202124; }
.brand { display: flex; flex-direction: column; align-items: flex-end; font-size: 10px; color: #5f6368; margin-top: 16px; gap: 2px; }
.brand .links { font-size: 9px; }
.instructions { display: none; margin-top: 20px; padding-top: 20px; border-top: 1px solid #e0e0e0; text-align: left; }
.instructions .fail-title { font-size: 16px; font-weight: 500; color: #d93025; margin-bottom: 12px; text-align: center; }
.instructions .steps { font-size: 13px; color: #202124; line-height: 1.8; }
.instructions .step-line { margin-bottom: 8px; }
.instructions .step { margin: 6px 0 6px 8px; }
.instructions kbd { display: inline-block; padding: 2px 6px; background: #f1f3f4; border: 1px solid #dadce0; border-radius: 3px; font-family: monospace; font-size: 11px; }