:root{font-family:Inter,Noto Sans SC,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:16px;background-color:#f7f9fc;color:#263238}body{margin:0;padding:0;line-height:1.6}*{box-sizing:border-box}#root{max-width:960px;margin:40px auto;padding:24px;background:white;border-radius:16px;box-shadow:0 8px 32px #0000000f}h1{font-size:24px;font-weight:700;margin-bottom:.3em}h2{font-size:16px;color:#607d8b;margin-bottom:1.5rem}.banner{background:#ffebee;padding:8px 16px;border-radius:8px;color:#c62828;font-size:14px;margin-bottom:16px;display:flex;justify-content:space-between;align-items:center}.year-button{display:block;width:100%;text-align:left;padding:10px 16px;margin-bottom:8px;border-radius:8px;background-color:#fff;color:#607d8b;border:1px solid #e0e0e0;cursor:pointer;transition:background .3s}.year-button:hover{background-color:#f0f4f8}.year-button.active{background-color:#2196f3;color:#fff;font-weight:600}.filter-chip{display:inline-block;padding:6px 14px;margin:4px 6px 4px 0;border-radius:20px;font-size:13px;cursor:pointer;border:1px solid #ddd;color:#607d8b;background-color:#fff;transition:all .2s ease-in-out}.filter-chip:hover{background-color:#f0f4f8}.filter-chip.active{background-color:#2196f3;color:#fff;border-color:#2196f3}.event-card{background-color:#fff;border-radius:12px;padding:16px 20px;margin-bottom:16px;box-shadow:0 2px 8px #0000000f;transition:transform .2s}.event-card:hover{transform:translateY(-2px);box-shadow:0 6px 20px #00000014}.event-date{font-weight:600;color:#263238;margin-bottom:4px}.event-country{font-size:12px;color:#90a4ae;margin-bottom:6px}.event-summary{font-size:14px;color:#607d8b}.tag{display:inline-block;background-color:#eceff1;padding:4px 10px;border-radius:12px;font-size:13px;font-weight:500;margin-left:8px}.country-flag.us-flag{background-color:#1e88e5;width:14px;height:14px;border-radius:50%;display:inline-block;margin-right:4px}.country-flag.cn-flag{background-color:#e53935;width:14px;height:14px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;margin-right:4px}.country-flag.cn-flag .cn-star{color:gold;font-size:10px}.filter-chip{border:1px solid #ccc;padding:4px 8px;border-radius:12px;margin:4px;cursor:pointer}.filter-chip.active{background-color:#2196f3;color:#fff;border-color:#1976d2}.year-button{background:#f0f0f0;padding:6px 10px;margin:2px;border-radius:8px;cursor:pointer}.year-button.active{background:#2196F3;color:#fff}.timeline-line{width:2px;background-color:#ccc;position:absolute;top:0;bottom:0;left:20px}.event-card{padding:16px;border-radius:12px;margin-bottom:16px;position:relative;box-shadow:0 2px 4px #0000000d}