A circular badge icon for a travel guide platform, designed for web thumbnail display at sizes as small as 32x32 and up to 128x128 pixels. Bold flat design with subtle gradient, 512x512 source resolution SVG, clean modern web aesthetic, vibrant saturated colors, bold white icon/symbol occupying at least 60% of the badge area on a colored background. Solid medium-weight border ring (no dashes, no dots). No text, no letters, no numbers. No fine lines, no thin details, no tiny shapes, no complex patterns, no embossed effects. No shadow, isolated on transparent background. All shapes must be large, bold, and clearly recognizable at 32x32 thumbnail size. Use high-contrast color pairs. Style: modern web achievement badge, bold geometric iconography. A circular badge icon. Background gradient from #81C784 (light green) to #388E3C (green). Center: a bold calendar page icon with a single large numeral "1" prominently displayed occupying most of the calendar face. No additional text or labels. Solid border ring. Premium web badge style, bold geometric vector art, clearly legible at 32px.